Anti-blocking corn thresher with built-in motor

Abstract

The invention relates to the technical field of threshers, and discloses an anti-blocking corn thresher with a built-in motor, which comprises a mounting rack, a thresher body arranged above the mounting rack, a feed port arranged above the thresher body, a particle discharge port arranged below the thresher body, and a corn cob discharge port arranged on the side wall of the thresher body. A screening plate is arranged in an inner cavity of the thresher body. A side baffle and an inner baffle are further arranged in an inner cavity of the thresher body. According to the anti-blocking corn thresher, the guide notches of the inner baffles are matched with the sliding rods connected with the sliding blocks to move, the ejector rods obliquely distributed above the sliding blocks move vertically in a reciprocating mode along with the sliding blocks, corn is pushed and prevented from being blocked between the two threshing rollers, and anti-blocking is achieved. Meanwhile, the driving assembly drives the angle of the screening plate to change dynamically through the sliding block, the threshed particles are accelerated to slide to the particle discharging opening along the screening plate, the corn cobs rapidly move to the corn cob discharging opening, and due to the fact that the motor is internally arranged for direct driving, the characteristics of energy conservation and high efficiency can be achieved, and screening blockage is avoided.

Description

Technical Field

[0001] This invention belongs to the field of threshing machine technology, specifically, it relates to a corn threshing machine with built-in motor to prevent clogging. Background Technology

[0002] In modern agricultural production, corn threshers are core equipment for post-harvest corn processing, and their operational efficiency and stability directly affect the smoothness of the agricultural production process and the economic benefits for farmers. With the improvement of mechanization, corn threshers with built-in motors have gradually become the mainstream choice for small and medium-sized farms and family farms due to their advantages such as compact structure, small space occupation, and direct power transmission, and are widely used in post-harvest corn threshing and processing scenarios.

[0003] Traditional equipment relies solely on the rotation of the two threshing rollers to achieve threshing, lacking an active anti-clogging structure. When the corn ears are of uneven size, the moisture content fluctuates, or the feeding speed is unstable, the corn ears or threshed kernels are easily stuck in the gap between the two threshing rollers, causing the threshing rollers to jam or even stop the machine. At this time, manual shutdown and cleaning are required, which not only interrupts the operation process and increases the labor maintenance cost, but may also cause wear on the threshing rollers or overload damage to the motor due to forced operation, seriously affecting the continuity of threshing.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A corn thresher with a built-in motor and anti-clogging features a mounting frame. A thresher body is mounted on top of the mounting frame. A feed inlet is located above the thresher body, and a pellet outlet is located below the thresher body. A corn cob outlet is located on the side wall of the thresher body. A screening plate is installed within the inner cavity of the thresher body. Side baffles and an inner baffle are also installed within the inner cavity. A left thresher roller and a right thresher roller are respectively mounted on opposite sides of the side baffles and the right thresher roller are symmetrical to each other. A guide slot is formed through the inner baffle. A sliding block is also installed within the inner cavity of the thresher body. Multiple linearly distributed actuating rods are mounted above the sliding block, with each actuating rod having two inclined pairs at their upper ends. A drive assembly is also installed within the inner cavity of the thresher body. The drive assembly drives the left and right thresher rollers to rotate and also drives the sliding block to move vertically. The vertical movement of the sliding block assists in changing the angle of the screening plate.

[0006] In a preferred embodiment of the present invention, the thresher body has circular slots on both sides opposite to the corn cob discharge port. The two circular slots are symmetrical to each other. The inner cavity of each circular slot is provided with a fixed bearing. The two fixed bearings are symmetrical to each other. The inner cavity of each fixed bearing is provided with a rotating rod. A screening plate is provided on the rotating rod.

[0007] In a preferred embodiment of the present invention, the bottom of the screening plate is provided with two slide rails, which are symmetrical to each other. A circular insertion rod is movably slidably arranged on each of the two slide rails. The two circular insertion rods are symmetrical to each other. A circular mounting cylinder is inserted into the bottom of each of the two circular insertion rods. The two circular mounting cylinders are symmetrical to each other. A return spring is provided at the bottom of the inner cavity of each of the two circular mounting cylinders. The other end of each of the two return springs is arranged on the circular insertion rod. The circular mounting cylinder is arranged on the threshing machine body.

[0008] In a preferred embodiment of the present invention, the drive assembly includes a servo motor disposed on the inner wall of the threshing machine body. The output shaft of the servo motor is provided with a rotating rod. The end of the rotating rod away from the servo motor movably passes through the inner baffle and is connected to the left threshing roller. The rotating rod is provided with a drive gear.

[0009] In a preferred embodiment of the present invention, the inner wall of the threshing machine body is further provided with a mounting bearing, and a rotating rod is rotatably provided in the inner cavity of the mounting bearing. The end of the rotating rod away from the mounting bearing moves through the inner baffle and is connected to the right threshing roller. A driven gear is provided on the rotating rod, and the driven gear meshes with the driving gear.

[0010] In a preferred embodiment of the present invention, a worm gear is further provided on the rotating rod, a worm wheel is meshed on one side of the worm gear, a rotating shaft is provided in the middle of the bottom of the worm wheel, a bearing is provided on the rotating shaft, a mounting bracket is provided on the bearing, and the end of the mounting bracket away from the bearing is provided on the inner wall of the threshing machine body.

[0011] In a preferred embodiment of the present invention, a driving bevel gear is provided at the end of the rotating shaft away from the worm gear, a driven bevel gear is vertically meshed on one side of the driving bevel gear, a drive rod is provided on the driven bevel gear, and a positioning bearing is provided at the end of the drive rod away from the driven bevel gear, the positioning bearing being disposed on the inner wall of the threshing machine body.

[0012] In a preferred embodiment of the present invention, a circular turntable is provided at the end of the drive rod away from the positioning bearing, and an irregularly shaped rotating plate is provided on the side wall of the circular turntable away from the positioning bearing. The irregularly shaped rotating plate is composed of an arc-shaped protrusion and an arc-shaped groove. An irregularly shaped slide rail is provided on the outer side wall of the irregularly shaped rotating plate, and a sliding block is slidably disposed on the irregularly shaped slide rail, and the sliding block slides on the arc-shaped protrusion and the arc-shaped groove respectively.

[0013] In a preferred embodiment of the present invention, a sliding rod is provided on one side of the sliding block, the sliding rod movably passes through the guide groove, the sliding rod and the guide groove are slidably connected, and the end of the sliding rod away from the sliding block is connected to the sliding block.

[0014] In a preferred embodiment of the present invention, a placement block is provided at the bottom of the sliding block, and the end of the placement block away from the sliding block is movably disposed on the screening plate.

[0015] Compared with the prior art, the present invention has the following advantages: This invention utilizes a sliding rod connected to a sliding block via a guide slot in the inner baffle. An inclined push rod above the sliding block moves vertically back and forth, pushing the corn to prevent it from getting stuck between the two threshing rollers, thus preventing blockage. Simultaneously, the drive assembly dynamically changes the angle of the screening plate via the sliding block, accelerating the sliding of threshed grains along the screening plate to the grain outlet. The corn cobs quickly move towards the corn cob outlet. Furthermore, due to the built-in direct drive motor, it achieves energy efficiency and high performance, avoiding screening blockage and significantly improving threshing efficiency and operational smoothness.

[0016] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] In the attached diagram: Figure 1 A three-dimensional structural diagram of a corn thresher with a built-in motor to prevent clogging; Figure 2 A bottom view of a corn thresher with a built-in motor for preventing blockage; Figure 3 This is a side view of a corn thresher with a built-in motor to prevent clogging. Figure 4 A schematic cross-sectional view of the thresher body of a corn thresher with a built-in motor for preventing blockage; Figure 5 A bottom view of the internal cavity structure of a corn thresher with a built-in motor for preventing blockage; Figure 6 A schematic diagram of the internal cavity structure of a corn thresher with a built-in motor for preventing blockage; Figure 7A schematic diagram of a partial internal structure of the thresher body of a corn thresher with a built-in motor for preventing blockage; Figure 8 This is a schematic diagram of the rear view of the internal cavity structure of a corn thresher with a built-in motor for preventing blockage. Figure 9 A corn thresher with built-in motor to prevent clogging Figure 8 Enlarged structural diagram at point A in the middle.

[0018] In the picture: 1. Mounting frame; 11. Threshing machine body; 111. Feed inlet; 112. Pellet outlet; 113. Corn cob outlet; 12. Circular groove; 121. Fixed bearing; 122. Rotating rod; 13. Screening plate; 131. Slide rail; 132. Circular mounting cylinder; 133. Circular plug-in rod; 134. Return spring; 14. Side baffle; 15. Inner baffle; 151. Guide groove; 16. Left threshing roller; 161. Right threshing roller; 2. Servo motor; 21. Rotating rod; 22. Driving gear; 221. Driven gear; 23. Rotating rod; 231. Mounting bearing; 24. Worm gear; 241. Worm wheel; 242. Rotating shaft; 243. Bearing holder; 244. Mounting bracket; 25. Driving bevel gear; 251. Driven bevel gear; 252. Drive rod; 253. Positioning bearing; 3. Circular turntable; 31. Irregularly shaped rotating plate; 311. Arc-shaped protrusion; 312. Arc-shaped groove; 32. Sliding block; 321. Sliding rod; 322. Sliding block; 323. Pushing rod; 324. Irregularly shaped slide rail; 33. Placement block. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0020] Example 1: like Figures 1 to 9As shown, a corn thresher with a built-in motor and anti-clogging features includes a mounting frame 1, a thresher body 11 mounted on top of the mounting frame 1, a feed inlet 111 mounted on top of the thresher body 11, a pellet discharge outlet 112 mounted below the thresher body 11, a corn cob discharge outlet 113 mounted on the side wall of the thresher body 11, and a screening plate 13 mounted inside the thresher body 11. The thresher body 11 also has a side baffle 14 and an inner baffle 15 inside the thresher body 11. A left thresher roller 16 and a right thresher roller 161 are mounted on opposite sides of the side baffle 14 and the inner baffle 15, respectively. The left thresher roller 16... Symmetrical to the right threshing roller 161, the inner baffle 15 has a through guide slot 151. The inner cavity of the threshing machine body 11 also has a sliding block 322. Above the sliding block 322 are multiple linearly distributed actuating rods 323, each actuating rod 323 having an inclined arrangement between each other at its upper end. The inner cavity of the threshing machine body 11 also has a drive assembly. The drive assembly drives the left and right threshing rollers 161 to rotate and also drives the sliding block 322 to move vertically. The vertical movement of the sliding block 322 assists in changing the angle of the screening plate 13. Through the guide slot 151 of the inner baffle 15 and the movement of the sliding rods connected to the sliding block 322, the inclined actuating rods 323 above the sliding block 322 move vertically back and forth, pushing the corn to prevent it from getting stuck between the two threshing rollers, thus preventing blockage. At the same time, the drive component drives the screen plate 13 to change its angle dynamically through the sliding block 322, which accelerates the threshing process. The threshed particles slide down the screen plate to the particle outlet 112, and the corn cobs quickly move to the corn cob outlet 113, avoiding screen blockage and greatly improving threshing efficiency and smooth operation.

[0021] like Figures 1 to 8 As shown in the specific embodiment, the thresher body 11 has circular slots 12 on both side walls opposite to the corn cob discharge port 113. The two circular slots 12 are symmetrical to each other, and each circular slot 12 has a fixed bearing 121 inside. The two fixed bearings 121 are symmetrical to each other, and a rotating rod 122 is installed inside the two fixed bearings 121. A screening plate 13 is installed on the rotating rod 122. In this configuration, the screening plate 13 can rotate.

[0022] like Figures 1 to 8As shown, furthermore, the bottom of the screening plate 13 is provided with two slide rails 131, which are symmetrical to each other. Circular insertion rods 133 are movably slidably mounted on each of the two slide rails 131. Circular mounting cylinders 132 are inserted into the bottom of each of the two circular insertion rods 133, which are also symmetrical to each other. A return spring 134 is provided at the bottom of the inner cavity of each of the two circular mounting cylinders 132, and the other end of each return spring 134 is mounted on the circular insertion rod 133. The circular mounting cylinders 132 are mounted on the threshing machine body 11. This configuration ensures that when the circular insertion rod 133 receives the thrust of the return spring 134, it can drive the screening plate 13 to rotate.

[0023] Example 2: The difference between Embodiment 1 and this embodiment is that: Figures 4 to 9 As shown, a corn thresher with a built-in motor for preventing blockage includes a drive assembly comprising a servo motor 2. The servo motor 2 is mounted on the inner wall of the thresher body 11. A rotating rod 221 is mounted on the output end of the servo motor 2. The end of the rotating rod 21 away from the servo motor 2 movably passes through an inner baffle 15 and is connected to the left threshing roller 16. A drive gear 22 is mounted on the rotating rod 21. In this configuration, the installation position and components of the drive assembly are determined.

[0024] like Figures 4 to 9 As shown in the specific embodiment, the inner wall of the threshing machine body 11 is also provided with a mounting bearing 231. A rotating rod 23 is rotatably mounted inside the mounting bearing 231. The end of the rotating rod 23 away from the mounting bearing 231 passes through the inner baffle 15 and is connected to the right threshing roller 161. A driven gear 221 is provided on the rotating rod 23, and the driven gear 221 meshes with the driving gear 22. In this configuration, the right threshing roller 161 can rotate.

[0025] like Figures 4 to 9 As shown, furthermore, a worm gear 24 is also provided on the rotating rod 23, and a worm wheel 241 is meshed on one side of the worm gear 24. A rotating shaft 242 is provided in the middle of the bottom of the worm wheel 241, and a bearing 243 is provided on the rotating shaft 242. A mounting bracket 244 is provided on the bearing 243, and the end of the mounting bracket 244 away from the bearing 243 is provided on the inner wall of the threshing machine body 11. In this arrangement, the worm wheel 241 can rotate.

[0026] like Figures 4 to 9As shown, further, a driving bevel gear 25 is provided at the end of the rotating shaft 242 away from the worm gear 242. A driven bevel gear 251 is vertically meshed on one side of the driving bevel gear 25. A drive rod 252 is provided on the driven bevel gear 251. A positioning bearing 253 is provided at the end of the drive rod 252 away from the driven bevel gear 251. The positioning bearing 253 is located on the inner wall of the threshing machine body 11. In this arrangement, the driven bevel gear 251 can rotate.

[0027] Example 3: The difference between Embodiment 2 and this embodiment is that: Figures 4 to 9 As shown, a corn thresher with a built-in motor and anti-clogging features a circular turntable 3 at the end of a drive rod 252 away from the positioning bearing 253. A shaped rotating plate 31 is provided on one side wall of the circular turntable 3 away from the positioning bearing 253. The shaped rotating plate 31 comprises an arc-shaped protrusion 311 and an arc-shaped groove 312. A shaped slide rail (324) is provided on the outer wall of the shaped rotating plate 21. A sliding block 32 is slidably mounted on the shaped slide rail 324, sliding on both the arc-shaped protrusion 311 and the arc-shaped groove 312. A sliding rod 321 is provided on one side of the sliding block 32, movably passing through a guide slot 151. The sliding rod 321 and the guide slot 151 are slidably connected. The end of the sliding rod 321 away from the sliding block 32 is connected to the sliding block 322. A placement block 33 is provided at the bottom of the sliding block 322, with the end of the placement block 33 away from the sliding block 322 movably mounted on a screening plate 13. In this configuration, it is ensured that the sliding block 322 can move vertically.

[0028] The implementation principle of the corn thresher with built-in motor for preventing blockage according to the present invention is as follows: When the work begins, the operator puts the corn to be threshed into the equipment through the feed port 111 above the threshing machine body 11, and then starts the drive components, and the entire threshing system immediately enters the operating state. The core of the drive component is the servo motor 2. After the servo motor 2 is started, it drives the rotating rod 21 connected to the output end to rotate. The end of the rotating rod 21 away from the servo motor 2 is connected to the left threshing roller 16. Therefore, the left threshing roller 16 rotates synchronously with the rotating rod 21. Meanwhile, the drive gear 22 installed on the rotating rod 21 can drive the driven gear 221 on the rotating rod 23 to rotate (because the drive gear 22 and the driven gear 221 mesh with each other), and the rotating rod 23 is rotatably installed on the inner wall of the threshing machine body 11 through the mounting bearing 231. The end of the rotating rod 23 away from the mounting bearing 231 is connected to the right threshing roller 161. Finally, the right threshing roller 161 rotates symmetrically with the left threshing roller 16 under the drive of the rotating rod 23. With the synchronous operation of the left threshing roller 16 and the right threshing roller 161, the corn entering from the feed inlet 111 is clamped by the two threshing rollers and threshed, and the corn kernels are initially separated from the corn cobs. While the drive component drives the threshing roller to thresh the corn, its transmission structure also triggers an anti-blocking mechanism to prevent the corn from getting stuck between the left threshing roller 16 and the right threshing roller 161 during the threshing process. Simultaneously, when the rotating rod 23 rotates, it drives the worm 24 on the outer side of the rod to rotate synchronously. The worm 24 meshes with the worm wheel 241 on one side, so the worm wheel 241 rotates with the rotation of the worm 24. The rotating shaft 242 installed in the middle of the bottom of the worm wheel 241 is fixed to the inner wall of the threshing machine body 11 by placing the bearing 243 and the mounting bracket 244. When the rotating shaft 242 rotates with the worm wheel 241, the driving bevel gear 25 connected to the end away from the worm wheel 241 also rotates. The driving bevel gear 25 meshes with the driven bevel gear 251 in the vertical direction. The driven bevel gear 251 is sleeved on the drive rod 252. The end of the driven bevel gear 252 away from the driven bevel gear 251 is fixed to the inner wall of the threshing machine body 11 through the positioning bearing 253. The rotation of the driven bevel gear 251 drives the drive rod 252 to rotate stably. The end of the drive rod 252 away from the positioning bearing 253 is connected to a circular turntable 3. When the circular turntable 3 rotates with the drive rod 252, the irregular rotating plate 31 installed on its side wall rotates synchronously. The irregular rotating plate 31 is composed of alternating arc-shaped protrusions 311 and arc-shaped grooves 312. The sliding block 32 that slides against its outer side wall will move back and forth in the vertical direction under the change of the contour of the arc-shaped protrusions 311 and the arc-shaped grooves 312. The sliding rod 321 connected to one side of the sliding block 32 passes through the guide slot 151 on the inner baffle 15 and maintains a sliding fit with the guide slot 151. Therefore, the vertical movement of the sliding block 32 will drive the sliding rod 321 to move synchronously along the guide slot 151. The end of the sliding rod 321 away from the sliding block 32 is connected to the sliding block 322. Finally, the sliding block 322 moves vertically back and forth with the sliding rod 321. Above the sliding block 322, there are multiple linearly distributed push rods 323 with their upper ends tilted in pairs. As the sliding block 322 moves vertically, the push rods 323 generate an upward pushing force on the corn during the threshing process, effectively preventing the corn from being squeezed or stuck between the left threshing roller 16 and the right threshing roller 161, thus achieving an anti-blocking effect. Meanwhile, the vertical movement of the sliding block 322 will also drive the screening plate 13 to adjust its angle, ensuring that the corn kernels and corn cobs are efficiently separated without clogging after threshing. The placement block 33 installed at the bottom of the sliding block 322 is movably attached to the screening plate 13 at the end away from the sliding block 322. When the sliding block 322 moves vertically, the placement block 33 generates an intermittent pushing force on the screening plate 13. The screening plate 13 is installed on the threshing machine body 11 through the rotating rod 122. The two ends of the rotating rod 122 are respectively embedded in the circular slots 12 on the side wall of the threshing machine body 11, and are kept free to rotate through the fixed bearings 121 in the circular slots 12, providing support for the angle change of the screening plate 13. Meanwhile, two slide rails 131 are symmetrically arranged at the bottom of the screening plate 13. The bottom end of the circular plug rod 133 slidably connected on the slide rail 131 is inserted into the circular mounting cylinder 132. The circular mounting cylinder 132 is fixed to the inner wall of the threshing machine body 11. The other end of the reset spring 134 installed at the bottom of its inner cavity is connected to the circular plug rod 133. When the pushing force of the placement block 33 on the screening plate 13 weakens, the reset spring 134 will release its elasticity to push the circular plug rod 133 to reset upward along the slide rail 131, thereby causing the screening plate 13 to rotate in the opposite direction around the rotating rod 122 as the axis, so that the inclination slope of the screening plate 13 changes continuously. This dynamic angle adjustment not only accelerates the sliding speed of corn kernels along the surface of the screening plate 13 to the kernel outlet 112 after threshing, but also allows the corn cobs to move quickly to the corn cob outlet 113, completely avoiding the accumulation and blockage of corn kernels or corn cobs on the screening plate 13, and ensuring smooth screening and discharge.

Claims

1. A corn thresher with built-in motor and anti-clogging function, comprising a mounting frame (1), characterized in that: The mounting frame (1) is provided with a threshing machine body (11) above it, a feed inlet (111) is provided above the threshing machine body (11), a pellet discharge outlet (112) is provided below the threshing machine body (11), a corn cob discharge outlet (113) is provided on the side wall of the threshing machine body (11), and a screening plate (13) is provided in the inner cavity of the threshing machine body (11). The threshing machine body (11) is also provided with a side baffle (14) and an inner baffle (15) in its inner cavity. A left threshing roller (16) and a right threshing roller (161) are respectively provided on the opposite side of the side baffle (14) and the inner baffle (15). The left threshing roller (16) and the right threshing roller (161) are symmetrical to each other. A guide slot (151) is provided through the inner baffle (15). A sliding block (322) is also provided in the inner cavity of the threshing machine body (11). A plurality of top rods (323) are arranged linearly above the sliding block (322). The upper ends of each top rod (323) are arranged in an inclined manner between each other. The inner cavity of the threshing machine body (11) is also provided with a driving component. The driving component is used to drive the left threshing roller (16) and the right threshing roller (161) to rotate. The driving component is also used to drive the sliding block (322) to move vertically. The vertical movement of the sliding block (322) is used to assist the angle change of the screening plate (13).

2. The corn thresher with built-in motor anti-clogging as described in claim 1, characterized in that, The thresher body (11) has circular slots (12) on both sides opposite to the corn cob discharge port (113). The two circular slots (12) are symmetrical to each other. The inner cavity of the two circular slots (12) is provided with fixed bearings (121). The two fixed bearings (121) are symmetrical to each other. The inner cavity of the two fixed bearings (121) is provided with rotating rods (122). The rotating rods (122) are provided with screening plates (13).

3. A corn thresher with built-in motor for preventing blockage as described in claim 2, characterized in that, The bottom of the screening plate (13) is provided with two slide rails (131), which are symmetrical to each other. Circular plug rods (133) are movably slidably arranged on the two slide rails (131). The two circular plug rods (133) are symmetrical to each other. Circular mounting cylinders (132) are inserted into the bottom of the two circular plug rods (133). The two circular mounting cylinders (132) are symmetrical to each other. A reset spring (134) is provided at the bottom of the inner cavity of each of the two circular mounting cylinders (132). The other end of the two reset springs (134) is arranged on the circular plug rod (133). The circular mounting cylinders (132) are arranged on the threshing machine body (11).

4. A corn thresher with built-in motor for preventing blockage as described in claim 1, characterized in that, The drive assembly includes a servo motor (2), which is located on the inner wall of the threshing machine body (11). The output of the servo motor (2) is provided with a rotating rod (221). One end of the rotating rod (21) away from the servo motor (2) passes through the inner baffle (15) and is connected to the left threshing roller (16). The rotating rod (21) is provided with a drive gear (22).

5. A corn thresher with built-in motor for preventing blockage as described in claim 1, characterized in that, The inner wall of the threshing machine body (11) is also provided with a mounting bearing (231). A rotating rod (23) is rotatably provided in the inner cavity of the mounting bearing (231). The end of the rotating rod (23) away from the mounting bearing (231) moves through the inner baffle (15) and is connected to the right threshing roller (161). A driven gear (221) is provided on the rotating rod (23). The driven gear (221) and the driving gear (22) mesh with each other.

6. A corn thresher with built-in motor for preventing blockage as described in claim 5, characterized in that, The rotating rod (23) is also provided with a worm (24), and a worm wheel (241) is meshed on one side of the worm (24). A rotating shaft (242) is provided in the middle of the bottom of the worm wheel (241). A placement bearing (243) is provided on the rotating shaft (242). A mounting bracket (244) is provided on the placement bearing (243). The end of the mounting bracket (244) away from the placement bearing (243) is provided on the inner wall of the threshing machine body (11).

7. A corn thresher with built-in motor for preventing blockage as described in claim 6, characterized in that, A drive bevel gear (25) is provided at the end of the rotating shaft (242) away from the worm gear (242). A driven bevel gear (251) is vertically meshed on one side of the drive bevel gear (251). A drive rod (252) is provided on the driven bevel gear (251). A positioning bearing (253) is provided at the end of the drive rod (252) away from the driven bevel gear (251). The positioning bearing (253) is provided on the inner wall of the threshing machine body (11).

8. A corn thresher with built-in motor for preventing blockage according to claim 7, characterized in that, A circular turntable (3) is provided at the end of the drive rod (252) away from the positioning bearing (253). A shaped rotating plate (31) is provided on the side wall of the circular turntable (3) away from the positioning bearing (253). The shaped rotating plate (31) consists of an arc-shaped protrusion (311) and an arc-shaped groove (312). A shaped slide rail (324) is provided on the outer side wall of the shaped rotating plate (21). A sliding block (32) is slidably provided on the shaped slide rail (324), and the sliding block (32) slides on the arc-shaped protrusion (311) and the arc-shaped groove (312) respectively.

9. A corn thresher with built-in motor for preventing blockage as described in claim 8, characterized in that, A sliding rod (321) is provided on one side of the sliding block (32). The sliding rod (321) moves through the guide slot (151). The sliding rod (321) and the guide slot (151) are slidably connected. The end of the sliding rod (321) away from the sliding block (32) is connected to the sliding block (322).

10. A corn thresher with built-in motor for preventing blockage as described in claim 9, characterized in that, The bottom of the sliding block (322) is provided with a placement block (33), and the end of the placement block (33) away from the sliding block (322) is placed on the screening plate (13).

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