Corn thresher

Abstract

The invention relates to the technical field of corn threshing, in particular to a corn thresher which comprises a machine frame, a machine shell, a transmission unit, a rolling barrel, a rolling shaft and a feeding cylinder. The machine frame is placed on the ground, a machine shell is fixedly installed on the machine frame, a rolling shaft is rotatably installed in the machine shell, a rolling barrel is fixedly installed on the rolling shaft, a transmission unit for driving the rolling shaft to rotate is fixedly installed on the lower portion of the machine shell, a feeding cylinder is fixedly installed on the top wall of the machine shell, and a feeding device is fixedly installed on the machine shell. And the feeding device is used for controlling the feeding speed of the corn after the rolling barrel is blocked. According to the corn thresher, the worm wheel in the feeding device is used for controlling the opening degree of the baffle at the feeding port so as to adjust the feeding speed of corn, and when the rolling barrel is blocked, the number of corn entering the machine shell is reduced, so that the rolling barrel has a space for automatically adjusting blockage, and the problem that an operator cannot uniformly throw corn into the thresher is solved.

Description

Technical Field

[0001] This invention relates to the field of corn threshing technology, specifically to a corn threshing machine. Background Technology

[0002] Threshing is a challenging task in traditional corn production; manual threshing is not only labor-intensive but also inefficient. With the continuous advancement of agricultural mechanization technology, threshing machines have become widely used.

[0003] A typical corn thresher consists of a drum, a motor, and a casing. The outside of the drum is covered with toothed spikes or hammers. The motor drives the drum to rotate via a belt, causing the corn inside the casing to be threshed by the action of the toothed spikes and hammers.

[0004] Existing large-scale corn threshers have automatic feeding functions, feeding the corn evenly into the machine casing via a conveyor belt. However, for small-scale individual corn farmers, smaller corn threshers are more suitable. In actual use, due to farmers' incomplete understanding of the mechanical principles and operating methods, or improper operation, problems such as kernel damage, machine damage, low efficiency, and even safety hazards can easily occur, affecting the thresher's working effect. Among these problems, the most common cause is that farmers fail to feed the corn evenly, feeding too much corn into the machine casing at once. This causes the corn cobs to not be discharged in time and become stuck in the gap between the drum and the casing, increasing the load on the drum, slowing down the rotation speed, and resulting in drum blockage, incomplete corn threshing, excessive corn fragments, and motor damage.

[0005] To address this, a corn thresher is proposed. By detecting the rotational speed of the motor-driven drum, the opening and closing degree of the baffle at the feed inlet is controlled to adjust the corn feeding speed and prevent excessive corn from entering the machine casing when blockage occurs inside the drum.

[0006] The information disclosed in this background section is only intended to enhance the understanding of the background of this disclosure, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a corn thresher that controls the opening and closing of a baffle at the feed inlet via a turbine in the feeding device to adjust the corn feeding speed. When the drum becomes clogged, the amount of corn entering the machine casing is reduced, allowing the drum to self-regulate the clogging, thereby solving the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A corn thresher includes: a frame, a housing, a transmission unit, a drum, a roller, and a feeding cylinder; the frame is placed on the ground, the housing is bolted to the frame, the roller is rotatably installed inside the housing, the drum is welded to the roller, the transmission unit for driving the roller to rotate is fixedly installed at the lower part of the housing, and the feeding cylinder is bolted to the top wall of the housing.

[0010] The feeding cylinder is at a certain angle to the horizontal plane. The dried corn is placed on the feeding cylinder and the corn continuously enters the machine casing along the feeding cylinder. The surface of the drum is covered with hammers. The transmission unit drives the drum to rotate, so that the hammers on the drum continuously hit the corn, separating the corn cob from the corn kernel. The bottom of the machine casing is equipped with a filter screen. After the corn kernel falls through the filter screen, it is discharged from the discharge port, while the corn cob is discharged from another discharge port.

[0011] Preferably, the feeding device includes a drive wheel keyed to the roller, a rotating shaft rotatably mounted inside the feeding cylinder, a baffle welded on the rotating shaft, the rotating shaft passing through the feeding cylinder, and an adjustment component provided at one end near the drive wheel. The adjustment component is used to automatically adjust the amount of obstruction of the baffle to the feeding cylinder and is driven by the drive wheel. A reset component for resetting the rotating shaft is provided on the top wall of the housing.

[0012] During the threshing process, the operator continuously adds corn to the feed cylinder. When a blockage occurs inside the threshing machine, the rotation speed of the drum will decrease. The adjustment component detects the rotation speed of the roller to determine the degree of blockage inside the drum and restricts the corn feed by controlling the opening and closing of the baffle on the rotating shaft.

[0013] When the drum rotates at its normal speed, the baffle is parallel to the feed inlet of the feeding cylinder under the action of the reset component, and the corn passes through the feed inlet and enters the machine casing without obstruction.

[0014] The drive wheel is fixedly connected to the roller. When the blockage inside the drum is minor, the adjusting component outputs torque to the roller, causing it to rotate slightly. This creates resistance on the baffle, forcing the corn to overcome this resistance before entering the machine casing. The corn's own weight pushes the baffle back to its initial position, thus reducing the speed at which the corn enters the casing. When the drum becomes blocked, simply reduce the amount of corn fed into the casing. As the drum continues to roll, it can resolve the blockage itself, such as by crushing the corn cobs or discharging them through its rotation. However, this process takes time, and the amount of corn fed should be reduced during this period.

[0015] Preferably, the adjusting assembly includes a mounting base bolted to the side wall of the housing, a rotating drum rotatably mounted in the middle of the mounting base, a driven wheel welded to the end of the rotating drum away from the feeding cylinder, a rotating shaft extending into the driven wheel, a turbine keyed to the shaft inside the driven wheel, a transmission medium cooperating with the turbine inside the driven wheel, a mechanical seal between the rotating shaft and the driven wheel, and a torque limiter between the turbine and the rotating shaft, the torque limiter being used to limit the torque applied by the turbine to the rotating shaft.

[0016] Furthermore, the driving wheel and the driven wheel are connected by a chain drive.

[0017] Furthermore, the transmission medium is hydraulic transmission oil.

[0018] The transmission medium uses hydraulic transmission oil, which has low viscosity and high density, enabling it to transmit kinetic energy more effectively.

[0019] The driving wheel is fixed on the roller, and the diameter of the driving wheel is the same as that of the driven wheel. The driving wheel and the driven wheel are connected by a chain drive, so that the driven wheel and the roller rotate at the same speed. The driven wheel is installed in the mounting base and rotates independently. The drum does not contact the shaft.

[0020] When the hydraulic oil in the driven wheel is at normal rotational speed, it is thrown against the inner wall of the driven wheel and does not contact the turbine. When a blockage occurs inside the casing, the speed of the roller decreases, causing the hydraulic oil to come into contact with the turbine and transfer kinetic energy to it. The turbine then drives the shaft to rotate, which in turn causes the baffle to block the feed inlet of the feeding cylinder, thus hindering the feeding of corn. If the rotational speed of the roller continues to decrease, the contact volume between the turbine and the hydraulic oil increases, and the turbine gains more kinetic energy. At this point, the torque limiter kicks in, forcing the baffle to rotate only to a vertical position, where the obstruction effect on the corn is maximized.

[0021] It's worth noting that even after the roller speed decreases, the kinetic energy of the hydraulic transmission oil in the driven wheel still meets the needs of driving the turbine. Increasing the contact volume between the hydraulic transmission oil and the turbine allows for the acquisition of even more kinetic energy. The hydraulic transmission oil moving on the inner wall of the driven wheel can be considered a uniformly distributed load. As the roller speed further decreases, the uniformly distributed load applied to the turbine blades increases. Therefore, although the speed of the hydraulic transmission oil decreases, the driving force on the turbine actually increases to some extent. In actual production, the roller speed will not drop to half its original value after blockage, because if this were to happen, the motor would have already activated its self-protection function and stopped.

[0022] In summary, when a blockage occurs inside the drum, the motor speed will decrease, but the decrease is limited, with the lowest output speed being about 70% to 80% of the original speed. This is very suitable for using hydraulic transmission oil to drive the turbine, thereby adaptively controlling the baffle to hinder the corn feeding speed.

[0023] The drive wheel and driven wheel are connected by a chain drive. Compared with belt or synchronous belt drive, chain drive does not require the chain to be tightened. It also has a smaller bending moment during power transmission, which increases the service life and stability of the components.

[0024] Preferably, the reset assembly includes shaft seats bolted to both sides of the feed cylinder, a rotating block installed inside the shaft seat via a torsion spring, and the rotating block connected to the rotating shaft via a key.

[0025] Furthermore, the width of the baffle is equal to the average diameter of the corn.

[0026] When the torsion spring is in its initial position, the baffle is parallel to the bottom plate at the feed inlet. The rotating shaft and the rotating block are connected by a key. When a blockage occurs inside the drum, the turbine overcomes the spring force of the torsion spring, causing the rotating shaft to rotate and keeping the baffle balanced at a certain angle. However, this balance can be disrupted by the weight of corn sliding off the feed cylinder. Therefore, when a minor blockage occurs in the drum, the corn is fed by first pressing the baffle to its initial position before falling into the machine casing. The width of the baffle is equal to the average diameter of the corn. When the corn presses the baffle to its initial position by its own weight and moves to the end face, the next corn is just on the rotating shaft. When the previous corn leaves the baffle, the weight of the next corn is not applied to the baffle, and the baffle can quickly lift up to block that corn. The same applies to subsequent corn. In this way, when the drum is blocked, the corn feeding speed is reduced. Moreover, the more severe the blockage, the more difficult it is for the corn to overcome the torque of the turbine by its own weight. This continues until the drum resolves the blockage through its own adjustment.

[0027] Preferably, multiple blades are fixedly installed on the inner wall of the driven wheel.

[0028] When the thresher is first started, the hydraulic transmission oil in the driven wheel changes from static to dynamic. At this time, the baffle will stand upright for a period of time. By setting multiple blades, the contact area between the inner wall of the driven wheel and the hydraulic transmission oil is increased, so that the hydraulic transmission oil can gain kinetic energy more quickly. When the thresher starts, the driven wheel can more quickly throw the hydraulic transmission oil onto the inner wall, avoiding affecting the corn entering the machine casing and improving working efficiency.

[0029] Preferably, the torque limiter includes multiple limiting grooves formed on the rotating shaft, each limiting groove having a spring fixedly installed therein, one end of the spring having a steel ball fixedly installed therein, and the inner wall of the turbine having a circular groove that cooperates with the steel ball.

[0030] The steel ball is located between the turbine and the shaft. The turbine drives the shaft to rotate through the steel ball. When the blockage in the drum is severe, the torsion spring rotates to its maximum value when the baffle rotates to the vertical position. At this time, the steel ball retracts into the shaft, allowing the turbine to spin freely on the shaft, preventing the turbine from jamming and improving its service life.

[0031] After the steel ball retracts into the shaft, the shaft is reset by the action of the torsion spring. However, during the reset process, the steel ball will bounce back into the groove, and the turbine will drive the shaft to the vertical position again, and so on in a cycle.

[0032] Preferably, the volume of hydraulic transmission oil installed in the driven wheel is This ensures that when the driven wheel rotates at normal speed, the hydraulic transmission oil does not come into contact with the turbine; where a is the inner radius of the driven wheel, b is the radius of the turbine, and h is the inner width of the driven wheel.

[0033] Adjust the inner and outer diameters of the driven wheel. If necessary, a reduction gear can be installed between the driving and driven wheels, or the viscosity of the hydraulic transmission oil can be adjusted so that the driven wheel, at its normal speed, just throws the hydraulic transmission oil onto the inner wall. At this point, the volume of hydraulic transmission oil added to the driven wheel is... In this volume, the hydraulic transmission oil forms an oil ring, and the turbine is located inside the oil ring. When the speed of the driven wheel changes, the hydraulic transmission oil loses its balance and comes into contact with the fan blades at the bottom of the turbine. In this way, the hydraulic transmission oil can come into contact with the turbine more quickly, allowing the turbine to react immediately.

[0034] Preferably, the volume of hydraulic transmission oil filled into the driven wheel is greater than [the volume of the hydraulic transmission oil].

[0035] Unlike the previous example, in this case, the hydraulic transmission oil remains in contact with all the turbine blades at normal rotational speed. At this point, the hydraulic transmission oil cannot drive the turbine. However, when blockage occurs in the drum, the contact area between the turbine and the hydraulic transmission oil increases, leading to increased torque and deformation of the torsion spring. The beneficial effect is the same and will not be elaborated further. However, this power transmission method allows for greater kinetic energy to be obtained at the same rotational speed, and the kinetic energy obtained by the turbine through this method is more stable. However, because the hydraulic transmission oil continues to impact the turbine at normal rotational speed, the turbine's lifespan is relatively shorter compared to the turbine described above.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] 1. When the drum's rotation speed is at its normal value, under the action of the reset component, the baffle is parallel to the feed inlet of the feeding cylinder, allowing the corn to pass through the inlet unimpeded and enter the machine casing. When the blockage inside the drum is minor, the baffle rotates slightly, creating resistance to the corn. Before entering the machine casing, the corn needs to overcome the resistance of the baffle, and its own weight first pushes the baffle back to its initial position before it falls into the machine casing, thus reducing the speed at which the corn enters the machine casing. This prevents excessive corn from entering the machine casing even after the drum becomes blocked, which could cause the motor to stop or the corn cobs to break, ensuring production efficiency and extending the service life of all components in the equipment.

[0038] 2. The width of the baffle is equal to the average diameter of the corn. When the corn pushes the baffle to its initial position by its own weight and moves to the end face, the next corn is just on the rotating shaft. When the previous corn leaves the baffle, the weight of the next corn is not applied to the baffle, at which point the baffle can quickly lift up to block the corn, and this cycle continues. When the drum becomes clogged, the corn feeding speed is further reduced.

[0039] 3. By setting multiple blades, the contact area between the inner wall of the driven wheel and the hydraulic transmission oil is increased, so that the hydraulic transmission oil can gain kinetic energy more quickly. When the thresher starts, the driven wheel can more quickly throw the hydraulic transmission oil onto the inner wall, avoiding affecting the corn entering the machine casing and improving working efficiency. Attached Figure Description

[0040] Figure 1 This is an overall structural diagram of the present invention;

[0041] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle;

[0042] Figure 3 for Figure 1 Enlarged view of the structure at point B in the middle;

[0043] Figure 4 This is a side view of the driven wheel at its normal rotational speed.

[0044] Figure 5 for Figure 4 Enlarged view of the structure at point D;

[0045] Figure 6 A diagram showing the internal state of the driven wheel when the drum becomes clogged.

[0046] Figure 7 This is a diagram showing the internal state of the driven wheel when it is at rest.

[0047] Figure 8 This is a front view of the overall structure of the present invention;

[0048] Figure 9 for Figure 8 Enlarged view of the structure at point C;

[0049] Figure 10 This is a cross-sectional view of the feed cylinder.

[0050] In the diagram: 1. Housing; 2. Frame; 3. Feed cylinder; 4. Roller; 101. Drive wheel; 102. Driven wheel; 103. Rotary drum; 104. Mounting base; 105. Shaft seat; 106. Rotating block; 301. Feed inlet; 302. Rotary shaft; 303. Baffle; 1021. Blade; 1022. Turbine; 1023. Steel ball; 1024. Spring; 1025. Hydraulic transmission oil. Detailed Implementation

[0051] The aspects and features of this disclosure, as well as the methods for implementing these aspects and features, will be apparent; however, this disclosure is not limited to the embodiments disclosed below and can be implemented in various forms. These embodiments are provided to assist those skilled in the art in fully understanding this disclosure, and this disclosure is limited only to the scope of the appended claims.

[0052] Example 1, please refer to Figures 1 to 10 This invention provides a corn thresher, the technical solution of which is as follows:

[0053] A corn thresher includes: a frame 2, a housing 1, a transmission unit, a drum, a roller 4, and a feeding cylinder 3; the frame 2 is fixed to the ground by a weight, the housing 1 is fixed to the upper part of the frame 2 by bolts, the roller 4 is rotatably installed inside the housing 1, the drum is welded to the roller 4, and one end of the roller 4 extends to the outside of the side wall of the housing 1, the lower part of the housing 1 is provided with a transmission unit, the transmission unit drives the extended end of the roller 4 on the housing 1, causing the drum to rotate and remove corn kernels from the corn cob, and the top of the housing 1 is bolted with a feeding cylinder 3, through which corn enters the housing 1.

[0054] A drive wheel 101 is keyed to the extended end of the roller 4. A mounting base 104 is bolted to the side wall of the housing 1. The rotating drum 103 is rotatably mounted in the mounting base 104 via bearings. A driven wheel 102 is fixedly mounted at the end of the rotating drum 103 away from the feeding cylinder 3. The drive wheel 101 and the driven wheel 102 are connected by chain drive. The rotating shaft 302 is rotatably mounted in the feeding cylinder 3, and one end of the rotating shaft 302 extends into the drive wheel 101. A turbine 1022 is fixedly mounted at one end of the rotating shaft 302. The driven wheel 102 is filled with hydraulic transmission oil 1025. Four limiting grooves are provided on the rotating shaft 302. A spring 1024 is placed in the limiting groove. A steel ball 1023 is glued to one end of the spring 1024. One-third of the steel ball 1023 is inside the turbine 1022.

[0055] When the threshing machine is started, the driven wheel 102 rotates under the drive of the chain. The hydraulic transmission oil 1025 in the driven wheel 102 changes from static to dynamic. At this time, the baffle 303 will stand upright for a period of time. When the hydraulic transmission oil 1025 is completely thrown onto the inner wall of the driven wheel 102, the baffle 303 is reset by the torsion spring. At this time, the baffle 303 is parallel to the bottom plate of the feed port 301.

[0056] Add dried corn to the feeding cylinder 3. The feeding cylinder 3 is at a certain angle to the horizontal plane. The corn continuously enters the machine casing 1 along the feeding cylinder 3. Because the posture and quantity of the corn entering the feeding cylinder 3 are constantly changing, the threshed corn is prone to getting stuck between the roller and the outer casing, causing the roller to become clogged. At this time, simply reduce the amount of corn fed into the machine casing 1. As the roller continues to roll, it can resolve the blockage by itself, such as by crushing the corn cobs or discharging them through its own rotation. However, this process takes a certain amount of time, and the amount of corn fed should be reduced during this period.

[0057] When the rotation speed of the drum is at the normal value, under the action of the torsion spring, the baffle 303 is parallel to the feed inlet 301 of the feed cylinder 3, and the corn passes through the feed inlet 301 without obstruction and enters the machine casing 1.

[0058] The drive wheel 101 is fixedly connected to the roller 4. When the blockage inside the roller is minor, the contact volume between the hydraulic transmission oil 1025 and the turbine 1022 is small. The turbine 1022 outputs a small amount of torque to the roller 4, causing it to rotate slightly. This causes the baffle 303 to resist the corn. Before entering the housing 1, the corn needs to overcome the resistance of the baffle 303. The weight of the corn will first press the baffle 303 back to its initial position before it can fall into the housing 1, thus reducing the speed at which the corn enters the housing 1. When the corn presses the baffle 303 back to its initial position by its own weight and moves to the end face, the next corn is just on the shaft 302. When the previous corn leaves the baffle 303, the weight of the next corn is not applied to the baffle 303, and the baffle 303 can quickly lift up to block the corn. The same applies to subsequent corn. Moreover, the more severe the blockage, the more difficult it is for the corn to overcome the torque of the turbine 1022 by its own weight, until the roller resolves the blockage through its own adjustment.

[0059] Example 2

[0060] The main reason for the blockage of the roller is that the user puts too much corn into the feeding cylinder 3. By directly setting the baffle 303 to obstruct the corn in the initial position, the resistance of the baffle 303 to the corn is provided by the torsion spring, so that no matter how much corn the user puts into the feeding cylinder 3, it will enter the machine casing 1 one by one in the feed inlet 301.

[0061] Specifically, unlike Embodiment 1, this embodiment directly addresses the issue of excessive corn entering the machine casing 1 at its source. The initial angle of the baffle 303 is 160° with the bottom wall of the feed inlet 301, ensuring that each ear of corn must overcome the torsion spring force with its own weight before entering the machine casing 1, thus ensuring that the corn enters the machine casing 1 evenly and preventing blockage of the drum. However, the production speed of this method is lower than that of Embodiment 1.

[0062] Furthermore, the spring force of the torsion spring cannot be too large, otherwise the corn will not fall into the machine casing 1. Therefore, the volume of hydraulic transmission oil 1025 added to the driven wheel 102 cannot be excessive. The amount added is controlled so that the hydraulic transmission oil 1025 only contacts the turbine 1022 after the drum becomes severely blocked, causing the baffle 303 to completely seal the feed inlet 301 until the drum self-adjustment is completed. Therefore, this embodiment cannot achieve adaptive adjustment for drum blockage, but its advantage is stable production.

[0063] Example 3

[0064] Unlike Embodiment 1, the elastic modulus of the torsion spring in the bearing 105 is increased, and the volume of the hydraulic transmission oil 1025 in the driven wheel 102 is increased, so that the hydraulic transmission oil 1025 remains in contact with the turbine 1022 at normal rotational speed. At this time, the hydraulic transmission oil 1025 cannot drive the turbine 1022. However, when blockage occurs in the drum, the contact area between the turbine 1022 and the hydraulic transmission oil 1025 increases, and the torque received by the turbine 1022 increases, causing the torsion spring to deform. The beneficial effects are the same as in Embodiment 1, and will not be elaborated further here.

[0065] Compared with Embodiment 1, all blades of the turbine 1022 can contact the hydraulic transmission oil 1025, obtaining more kinetic energy at the same speed. The kinetic energy obtained by the turbine 1022 in this way is more stable. However, since the hydraulic transmission oil 1025 still continuously impacts the turbine 1022 at normal speed, the service life of the turbine 1022 is relatively reduced compared with Embodiment 1.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate and facilitate those skilled in the art to understand the technical solutions of the present invention, and are not intended to limit them; modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the inventive motivation of the present invention.

Claims

1. A corn sheller comprising: A frame (2), a housing (1), a transmission unit, a drum, a roller (4), and a feeding cylinder (3) are provided. The frame (2) is placed on the ground. The housing (1) is fixedly installed on the frame (2). The roller (4) is rotatably installed inside the housing (1). The drum is fixedly installed on the roller (4). The transmission unit that drives the roller (4) to rotate is fixedly installed on the lower part of the frame (2). The feeding cylinder (3) is fixedly installed on the top wall of the housing (1). Its characteristic is that it further includes: Feeding device: A feeding device is fixedly installed on the housing (1). The feeding device is used to adaptively adjust the corn feeding speed after the drum is blocked. The more severe the blockage of the drum, the slower the corn feeding speed.

2. A maize thresher according to claim 1, characterised in that: The feeding device includes a drive wheel (101) fixedly mounted on a roller (4), a rotating shaft (302) rotatably mounted inside the feeding cylinder (3), a baffle (303) fixedly mounted on the rotating shaft (302), the rotating shaft (302) passing through the feeding cylinder (3), and an adjustment component provided at one end near the drive wheel (101). The adjustment component is used to automatically adjust the amount of obstruction of the baffle (303) on the feeding cylinder (3) and is driven by the drive wheel (101). A reset component is provided on the top wall of the housing (1) to reset the rotating shaft (302).

3. A maize thresher according to claim 2, characterised in that: The adjustment assembly includes a mounting base (104) fixedly mounted on the side wall of the housing (1). A rotating drum (103) is rotatably mounted in the middle of the mounting base (104). A driven wheel (102) is fixedly mounted at the end of the rotating drum (103) away from the feeding cylinder (3). A rotating shaft (302) extends into the driven wheel (102). A turbine (1022) is fixedly mounted on the shaft inside the driven wheel (102). A transmission medium is contained in the driven wheel (102). A mechanical seal is used between the rotating shaft (302) and the driven wheel (102). A torque limiter is provided between the turbine (1022) and the rotating shaft (302). The torque limiter is used to limit the torque applied by the turbine (1022) to the rotating shaft (302).

4. A maize thresher according to claim 2, characterised in that: The reset assembly includes a bearing seat (105) fixedly installed on both sides of the feed cylinder (3). A rotating block (106) is installed in the bearing seat (105) by a torsion spring. The rotating block (106) is connected to the rotating shaft (302) by a key.

5. A maize thresher according to claim 3, characterised in that: The torque limiter includes multiple limiting grooves formed on the rotating shaft (302), and a spring (1024) is fixedly installed in each limiting groove. A steel ball (1023) is fixedly installed at one end of the spring (1024), and a circular groove that cooperates with the steel ball (1023) is formed on the inner wall of the turbine (1022).

6. A corn thresher according to claim 3, characterized in that: The driving wheel (101) and the driven wheel (102) are connected by a chain drive.

7. A corn thresher according to claim 3, characterized in that: Multiple blades (1021) are fixedly installed on the inner wall of the driven wheel (102).

8. A corn thresher according to claim 3, characterized in that: The transmission medium is hydraulic transmission oil (1025).

9. A corn thresher according to claim 8, characterized in that: The volume of hydraulic transmission oil (1025) loaded into the driven wheel (102) is equal to This ensures that when the driven wheel (102) rotates at normal speed, the hydraulic transmission oil (1025) does not come into contact with the turbine (1022), where a is the inner wall radius of the driven wheel (102), b is the radius of the turbine (1022), and h is the inner wall width of the driven wheel (102).

10. A corn thresher according to claim 8, characterized in that: The volume of the hydraulic transmission oil (1025) loaded into the driven wheel (102) is greater than Where a is the inner wall radius of the driven wheel (102), b is the radius of the turbine (1022), and h is the inner wall width of the driven wheel (102).

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