Threshing chamber height adjuster for corn threshers

Abstract

This utility model discloses a height adjuster for the threshing bin of a corn thresher, belonging to the technical field of corn threshers, and is mainly used to adjust the height of the threshing bin in a corn thresher. The technical problem to be solved by this utility model is to provide a height adjuster for the threshing bin of a corn thresher, including a frame, a threshing bin, a compression spring, a pressure plate, a limiting member, and a rotating rod. From bottom to top, the compression spring, pressure plate, transmission guide, and limiting member are arranged sequentially above the threshing bin. The rotating rod passes through the limiting member and is connected to it via transmission. The lower end of the rotating rod is connected to a transmission guide mechanism. The transmission guide mechanism includes guide parts with a high end and a low end, with a smooth transition guide surface between the high end and the low end. The guide surface abuts against and cooperates with the lower surface of the limiting member. At least two guide parts are arranged circumferentially around the rotating rod, with the high end of one guide part adjacent to the low end of another adjacent guide part. This threshing bin height adjuster stably adjusts the size of the threshing bin and reduces the impact of vibration on the height adjuster.

Description

Technical Field

[0001] This utility model relates to the field of corn thresher technology, and in particular to a height adjuster for the threshing chamber of a corn thresher. Background Technology

[0002] To ensure that corn threshers can adapt to corn cobs of different diameters and achieve complete threshing with a high threshing rate, a threshing chamber height adjustment device is often installed on the corn thresher. This device adjusts the height of the threshing chamber to accommodate corn cobs of different diameters that have already been threshed, preventing them from clogging the chamber and affecting the threshing of subsequent corn cobs.

[0003] However, most existing corn threshers use an adjusting rod, eccentric wheel, and spring design for their thresher bin height adjustment devices. While this achieves a certain level of height adjustment, it has technical defects. For example, the structure described in CN101965775B, "Multi-position Thresher Bin Height Adjustment Device for Corn Threshers," involves rotating a shift handle to drive a shift shaft, which in turn drives a positioning wheel. Since the positioning wheel is fixed to the shift shaft through an eccentric hole, the positioning wheel presses down the pressing plate at different heights, thus achieving height adjustment at the thresher bin outlet. In actual use, corn cobs vibrate to varying degrees during threshing in the threshing chamber. Since the diameter of the corn cobs differs, their movement with the threshing rollers causes vibration or compression on the pressure plate and return spring located above the threshing chamber. This vibration and compression are transmitted through the pressure plate to the positioning wheel and then to the shifting shaft. Because the positioning wheel is only located at one end of the shifting shaft, and the shifting shaft is relatively long, when this vibration and compression are transmitted through the pressure plate to the end of the shifting shaft with the positioning wheel, it can cause the end with the positioning wheel to wobble or shift vertically. This can lead to wear or deformation at the connection between the shifting shaft and the positioning plate, affecting the service life of the shifting shaft and causing malfunctions in the height adjustment device. Even worse, it can cause the shift lever to shift in position within the shift plate, affecting the accuracy and stability of the adjusted threshing chamber size. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a height adjuster for the threshing chamber of a corn thresher, which is mainly used to adjust the height of the threshing chamber in the corn thresher, so as to achieve the purpose of adjusting the size of the threshing chamber according to the size of the corn cob, realizing stable adjustment, and reducing the impact of shaking on the height adjuster.

[0005] This utility model discloses a height adjuster for the threshing chamber of a corn thresher, comprising a frame, a threshing chamber inclined or horizontally mounted on the frame, and a compression spring mounted on the top of the threshing chamber; it also includes a pressure plate, a limiting member, and a rotating rod. The pressure plate is positioned above the threshing chamber and connected to the compression spring. The limiting member is mounted on the frame and positioned above the pressure plate. The vertically positioned rotating rod passes through the limiting member and is drively connected to it. The lower end of the rotating rod is connected to a transmission guide mechanism located between the limiting member and the pressure plate. The transmission guide mechanism includes a guide portion, which includes a high end and a low end, with a smooth transition guide surface between the high end and the low end. The lower surface of the transmission guide mechanism is connected to the upper surface of the pressure plate, and the guide surface abuts against and cooperates with the lower surface of the limiting member. At least two guide portions are provided, arranged circumferentially around the rotating rod, with the high end of one guide portion adjacent to the low end of another adjacent guide portion.

[0006] Furthermore, the guide portion is a block structure, and the transmission guide mechanism is an integrally formed structure.

[0007] Furthermore, the guide portion includes a vertically arranged arc-shaped plate, the upper surface of which serves as the guide surface. At least two arc-shaped plates are enclosed to form an annular structure coaxially arranged with the rotating rod. The transmission guide mechanism also includes a connector connected to and located within the annular structure. The connection position of the connector to the annular structure is not higher than the lower end of the arc-shaped plate.

[0008] Furthermore, the guide portion includes a horizontally arranged guide ring coaxially with the rotating rod. A connecting rod is vertically arranged on the guide ring, and at least two connecting rods are evenly spaced on the guide ring. An arc-shaped rod is provided between two adjacent connecting rods. One end of the arc-shaped rod is connected to the high end of one of the connecting rods, and the other end is connected to the low end of the adjacent connecting rod. The upper surface of the arc-shaped rod serves as the guide surface. At least two arc-shaped rods enclose and form a ring structure coaxially with the rotating rod. The transmission guide mechanism also includes a connecting member connected to the connecting rod and located within the ring structure. The connection position of the connecting member to the connecting rod is not higher than the low end position where the arc-shaped rod connects to the connecting rod. The rotating rod is connected to the connecting member.

[0009] Furthermore, the high end of the guide portion is provided with an upwardly extending limiting section, the height of which is higher than that of the limiting member.

[0010] Furthermore, the limiting component includes a limiting plate disposed above the transmission guide mechanism. The lower end of the rotating rod passes through the center of the limiting plate and is connected to the transmission guide mechanism. The lower surface of the limiting plate abuts against the guide surface. Both ends of the limiting plate are provided with bent portions. The frame is provided with upright plates located at both ends of the limiting plate. Each upright plate is provided with a positioning hole. Each bent portion is provided with a strip hole corresponding to the positioning hole. A bolt is provided in the strip hole. The bolt passes through the strip hole and the positioning hole in sequence and is threadedly connected to the positioning hole.

[0011] Furthermore, the limiting component includes a limiting rod and a connecting plate. The limiting rod is disposed at both ends of the connecting plate. The lower end of the rotating rod passes through the connecting plate and connects with the transmission guide mechanism. The lower surface of the limiting rod abuts against the guide surface. The frame is provided with upright plates. Each upright plate has an upward-opening positioning groove. The end of the limiting rod away from the connecting plate is provided with a threaded section. The threaded section is disposed in the positioning groove. Each threaded section is provided with a first nut and a second nut located on the left and right sides of the upright plate, respectively, to fix the limiting rod.

[0012] Furthermore, the frame is also provided with positioning columns located on both sides of the threshing chamber. The two sides of the pressure plate pass through the positioning columns and are slidably connected to the positioning columns. Multiple positioning columns are spaced apart on the frame along the length of the frame.

[0013] Furthermore, each of the positioning columns is fitted with a return spring, one end of which is located below the pressure plate and the other end is located on the frame.

[0014] Furthermore, the frame is also provided with a cover plate located above the limiting member, the upper end of the rotating rod passes through the cover plate and is rotatably connected to the cover plate; the cover plate is provided with a plurality of limiting holes, which are arranged circumferentially around the rotating rod as an axis; the upper end of the rotating rod is hinged with a rotating handle, and the rotating handle is provided with an insertion part facing the cover plate, which is connected to the limiting hole.

[0015] As a preferred embodiment, the plug-in portion is further provided with an elastic connector that connects to the rotating rod.

[0016] The beneficial effects of this utility model are as follows: By setting up this transmission guide mechanism, the cooperation between the guide surface and the limiting component makes the downward pressure of the transmission guide mechanism on the pressure plate more uniform, ensuring that the size of the entire threshing chamber is consistent, so that the corn is subjected to uniform extrusion pressure during the threshing process, improving the threshing effect and product quality. At the same time, since the pressure plate moves up and down as a whole under the drive of the transmission guide mechanism, it avoids the pressure plate tilting and pressing down due to uneven local force, which would cause the space inside the threshing chamber to be uneven. Moreover, the transmission guide mechanism is provided with a limiting component above it to restrict its up and down movement. At the same time, the rotating rod is rotatably connected to the limiting component, and the left and right position of the rotating rod is restricted by the limiting component, that is, the left and right position of the transmission guide mechanism is restricted, so that the pressure plate remains stable during the movement, avoiding the impact of vibration or shaking of the threshing chamber on the pressing effect, realizing stable adjustment of the size of the threshing chamber, and reducing the impact of shaking on the height adjuster. Attached Figure Description

[0017] Figure 1 : A schematic diagram of the overall structure of the corn thresher when the height adjustment device of the thresher bin is installed on the corn thresher;

[0018] Figure 2 A partial schematic diagram of the height adjustment device of the threshing chamber of the corn thresher;

[0019] Figure 3 : A schematic diagram of the layout of the limiting components of the height adjustment device for the threshing chamber of the corn thresher;

[0020] Figure 4 : Another schematic diagram of the limit component of the height adjustment device of the threshing chamber of the corn thresher;

[0021] Figure 5 : A schematic diagram of the transmission guide mechanism when the guide part is a block structure;

[0022] Figure 6 : A schematic diagram of the transmission guide mechanism when the guide part is an arc-shaped plate;

[0023] Figure 7 : A schematic diagram of the transmission guide mechanism when the guide part is an arc-shaped rod;

[0024] Figure 8 : A schematic diagram of the transmission guide mechanism when the guide part is an arc rod and the connecting part is a circular plate;

[0025] Figure 9 : A schematic diagram of one possible layout when the diameter of the connector is smaller than the diameter of the ring structure;

[0026] Figure 10 : A schematic diagram of one possible layout when the diameter of the connector is larger than the diameter of the ring structure;

[0027] Figure 11 : Structural diagram of the rotating rod;

[0028] Reference numerals: 1-Frame; 11-Feed hopper; 12-Threshing bin; 13-Threshing roller assembly; 14-Compression spring; 15-Upright plate; 151-Positioning hole; 152-Positioning groove; 2-Pressure plate; 21-Positioning column; 211-Reset spring; 3-Rotating rod; 31-Rotating handle; 32-Plug-in part; 33-Elastic connector; 4-Transmission guide mechanism; 41-Guide part; 411-High end; 4111-Limit. Section; 412-lower end; 413-guide surface; 42-connector; 421-connecting rod; 43-arc plate; 44-guide ring; 441-connecting rod; 442-arc rod; 5-limiting component; 51-limiting plate; 511-bending part; 512-strip hole; 513-bolt; 52-limiting rod; 521-connecting plate; 522-first nut; 523-second nut; 6-cover plate; 61-limiting hole. Detailed Implementation

[0029] The present invention will be further described below.

[0030] This utility model provides a height adjuster for the threshing chamber of a corn thresher, mainly used to adjust the height of the threshing chamber 12 in the corn thresher. It includes a frame 1, a threshing chamber 12 inclined or horizontally mounted on the frame 1, and a compression spring 14 mounted on the top of the threshing chamber 12; it also includes a pressure plate 2, a limiting member 5, and a rotating rod 3. The pressure plate 2 is positioned above the threshing chamber 12 and connected to the compression spring 14. The limiting member 5 is mounted on the frame 1 and located above the pressure plate 2. The vertically positioned rotating rod 3 passes through the limiting member 5 and is drively connected to it. The lower end of the rotating rod 3 is connected to a device located between the limiting member 5 and the pressure plate 2. The transmission guide mechanism 4 includes a guide portion 41, which includes a high end 411 and a low end 412. A smooth transition guide surface 413 is provided between the high end 411 and the low end 412. The lower surface of the transmission guide mechanism 4 is in contact with the upper surface of the pressure plate 2, and the guide surface 413 abuts against and cooperates with the lower surface of the limiting member 5. At least two guide portions 41 are provided, and at least two guide portions 41 are arranged around the circumference of the rotating rod 3. The high end 411 of one guide portion 41 is adjacent to the low end 412 of the other guide portion 41.

[0031] like Figures 1-7As shown, the height adjuster of the threshing chamber 12 of the corn thresher includes an existing frame 1, a threshing chamber 12 that is inclined or horizontally set on the frame 1, and a compression spring 14 set on the top of the threshing chamber 12. A pressure plate 2 is connected above the pressure spring 14, and a transmission guide mechanism 4 is provided above the pressure plate 2. The transmission guide mechanism 4 can rotate above the pressure plate 2. A limiting member 5 is provided above the transmission guide mechanism 4. A rotating rod 3 that is fixedly connected to the transmission guide mechanism 4 is rotatably provided on the limiting member 5. By rotating the rotating rod 3, the transmission guide mechanism 4 is driven to rotate between the pressure plate 2 and the limiting member 5. The transmission guide mechanism 4 includes at least two guide portions 41 arranged circumferentially around the rotating rod 3. Each guide portion 41 has a high end 411 and a low end 412. A smooth transition guide surface 413 is provided between the high end 411 and the low end 412. The lower surfaces of multiple guide portions 41 enclose a circle coaxially arranged with the rotating rod 3. That is, the contact surface between the transmission guide mechanism 4 and the pressure plate 2 is circular, with a large contact area, which enables the pressure plate 2 to move up and down as a whole when the transmission guide mechanism 4 presses down on the pressure plate 2. The adjacent guide portions 41 are arranged such that the high end 411 of one guide portion 41 is adjacent to the low end 412 of another guide portion 41. Specifically, the adjacent arrangement means that the high end 411 of one guide portion 41 is connected to the low end 412 of another guide portion 41, or the high end 411 of one guide portion 41 is spaced apart from the low end 412 of another adjacent guide portion 41. This configuration allows multiple guide surfaces 413 of the transmission guide mechanism 4 to abut against the lower surface of the limiting member 5 during rotation. Since the contact height between each guide part 41 and the limiting member 5 is consistent during rotation, the pressure plate 2 can move upwards or downwards as a whole, resulting in more precise and stable height adjustment of the threshing chamber 12. Furthermore, the cooperation of multiple guide parts 41 ensures more uniform downward pressure on the pressure plate 2 by the transmission guide mechanism 4, maintaining the correct size of the entire threshing chamber 12. Even if the pressure plate 2 experiences slight up-and-down movement due to vibration of the threshing chamber 12, the presence of the limiting member 5 above the transmission guide mechanism 4, and the multiple contact surfaces between the transmission guide mechanism 4 and the limiting member 5, prevents the transmission guide mechanism 4 from tilting or moving left or right.By setting up the transmission guide mechanism 4, and utilizing the cooperation between the guide surface 413 and the limiting member 5, the downward pressure of the transmission guide mechanism 4 on the pressure plate 2 is made more uniform, ensuring that the entire threshing chamber 12 is of uniform size. This allows the corn to be subjected to uniform extrusion pressure during the threshing process, improving the threshing effect and product quality. At the same time, since the pressure plate 2 moves up and down as a whole under the drive of the transmission guide mechanism 4, it avoids the pressure plate 2 tilting and pressing down due to uneven local force, which would cause the space inside the threshing chamber 12 to be of different sizes. Furthermore, the transmission guide mechanism 4 is provided with a limiting member 5 above it to restrict its up and down movement. At the same time, the rotating rod 3 is rotatably connected to the limiting member 5. The limiting member 5 restricts the left and right position of the rotating rod 3, that is, it restricts the left and right position of the transmission guide mechanism 4, so that the pressure plate 2 remains stable during the movement. This avoids the impact of vibration or shaking of the threshing chamber 12 on the pressing effect, achieves stable adjustment of the size of the threshing chamber 12, and reduces the impact of shaking on the height adjuster.

[0032] When the aforementioned guide parts 41 are an even number and arranged circumferentially around the rotating rod 3 as an axis, such as Figure 2 As shown, only one limiting member 5 can be provided, which is arranged above the transmission guide mechanism 4 along the diameter direction of the transmission guide mechanism 4. In this case, the guide surfaces 413 of the two guide parts 41 that are centrally symmetrical about the rotating shaft will contact the lower surface of the limiting member 5, so that when the rotating rod 3 drives the transmission guide mechanism 4 to rotate, the transmission guide mechanism 4 always maintains symmetrical force, thereby ensuring that the downward pressure of the transmission guide mechanism 4 on the pressure plate 2 is evenly distributed, driving the pressure plate 2 to move upward or downward as a whole; when the above-mentioned guide parts 41 are odd in number and arranged axially around the rotating rod 3 with the rotating shaft as the axis, such as Figure 4 As shown, a limiting member 5 is provided above each guide part 41 to ensure that each guide surface 413 is pressed down synchronously during the rotation of the transmission guide mechanism 4 driven by the rotating rod 3, thus preventing the pressure plate 2 from tilting and pressing down due to the different contact points between each guide part 41 and the limiting member 5. The limiting member 5 can be a plate structure, which is set above the transmission guide part 41 by the brackets or pillars set on the left and right sides of the frame 1, so as to ensure that it can cooperate with the guide surface 413 of the transmission guide mechanism 4. This allows the rotating rod 3 to drive the transmission guide mechanism 4 to rotate, thereby controlling the contact between the guide surface 413 at different heights and the limiting member 5, and thus controlling the pressing height of the transmission guide mechanism 4 on the pressure plate 2, thereby adjusting the height of the threshing chamber 12.

[0033] As a first embodiment, such as Figure 5As shown, the guide part 41 is a block structure, and the transmission guide mechanism 4 is an integrally formed structure. Specifically, the upper surface of the guide part 41 is a guide surface 413 that smoothly transitions from the high end 411 to the low end 412. The entire guide part 41 is a block structure. The contact surface between the transmission guide mechanism 4, which is composed of the guide part 41, and the pressure plate 2 is circular. The transmission guide mechanism 4 has a simple structure, is easy to manufacture and install. The lower end of the rotating rod 3 is directly connected to the guide part 41. The transmission guide mechanism 4 is an integrally formed structure with high strength and stability, and can withstand greater pressure. This ensures the degree of downward pressure of the transmission guide mechanism 4 on the pressure plate 2, reduces the possibility of the transmission guide mechanism 4 shifting due to the vibration of the threshing chamber 12, and ensures the stability of the height of the threshing chamber 12.

[0034] As a second embodiment, such as Figure 6 As shown, the guide part 41 includes a vertically arranged arc-shaped plate 43, the upper surface of which serves as the guide surface 413. At least two arc-shaped plates 43 are enclosed to form an annular structure coaxially arranged with the rotating rod 3. The transmission guide mechanism 4 also includes a connector 42 connected to and located within the annular structure. The connection position of the connector 42 with the annular structure is not higher than the lower end 412 of the arc-shaped plate 43. The rotating rod 3 is connected to the connector 42. The transmission guide mechanism 4, made by using the vertically arranged arc-shaped plate 43 as the guide part 41, has an annular contact surface with the pressure plate 2. It is hollow inside and lightweight, effectively improving the flexibility of using the rotating rod 3 to drive the transmission guide part 41 to rotate between the limiting member 5 and the pressure plate 2 to adjust the height of the threshing chamber 12. Furthermore, The ring structure formed by the arc plate 43 and the rotating rod 3 is coaxially arranged. This ensures that the pressure plate 2 is subjected to uniform force when the transmission guide mechanism 4 and the limiting member 5 are used together, and ensures that the pressure plate 2 moves synchronously downward or upward at each position, thereby ensuring the stability of the height of the threshing chamber 12. It should be noted that the connection position of the connecting member 42 and the arc plate 43 is not higher than the lower end 412 of the arc plate 43. This is to avoid the connecting plate 521 from contacting the limiting member 5 when the rotating rod 3 drives the entire transmission guide mechanism 4 to rotate. This would be because the connecting member 42 is set higher than the lower end 412 of the arc plate 43, which would prevent the guide surface 413, which is lower than the connecting member 42, from contacting the limiting member 5, thus affecting the range of height adjustment of the threshing chamber 12 by the height adjuster of the corn thresher.

[0035] As a third embodiment, such as Figure 7 , Figure 8As shown, the guide part 41 includes a horizontally arranged guide ring 44 coaxially with the rotating rod 3. A connecting rod 441 is vertically arranged on the guide ring 44. At least two connecting rods 441 are evenly spaced on the guide ring 44. An arc-shaped rod 442 is provided between adjacent connecting rods 441. One end of the arc-shaped rod 442 is connected to the high end 411 of one of the connecting rods 441, and the other end is connected to the low end 412 of the adjacent connecting rod 441. The upper surface of the arc-shaped rod 442 serves as the guide. Surface 413, at least two of the said arc-shaped rods 442 enclose and form an annular structure coaxially arranged with the rotating rod 3. The transmission guide mechanism 4 also includes a connecting member 42 connected to the connecting rod 441 and located within the annular structure. The connection position of the connecting member 42 and the connecting rod 441 is not higher than the lower end 412 where the arc-shaped rod 442 connects with the connecting rod 441. The rotating rod 3 is connected to the connecting member 42. A guide ring 44, a connecting rod 441, and an arc-shaped rod 442 are used as the guide part 41, and the guide ring 44 serves as... The upper surface of the arc-shaped rod 442 serves as the guide surface 413, which is the contact surface between the transmission guide mechanism 4 and the pressure plate 2. This further reduces the weight of the transmission guide mechanism 4 and lowers its manufacturing cost. Furthermore, by setting a guide ring 44 coaxially arranged with the rotating rod 3, it ensures that the pressure plate 2 is subjected to uniform force when the transmission guide mechanism 4 and the limiting member 5 are used together, ensuring that the pressure plate 2 moves synchronously downwards or upwards at various positions, thereby ensuring the stability of the height of the threshing chamber 12. It should be noted that the connection between the aforementioned connecting member 42 and the connecting rod 441... The connection position is not higher than the lower end 412 where the arc rod 442 and the connecting rod 441 meet, so as to avoid the connecting plate 521 connecting with the limiting member 5 when the rotating rod 3 drives the entire transmission guide mechanism 4 to rotate. This is because the setting position of the connecting piece 42 is higher than the lower end 412 where the arc rod 442 and the connecting rod 441 meet, which would cause the guide surface 413, which is lower than the connecting piece 42, to be unable to abut against the limiting member 5, thus affecting the range of height adjustment of the threshing chamber 12 by the height adjuster of the corn thresher.

[0036] To facilitate the connection of the rotating rod 3 and the connecting member 42 in the second and third embodiments described above, the connecting member 42 can be a connecting plate with a diameter consistent with the diameter of the annular structure or a strip rod arranged along the diameter of the annular structure. The connecting plate can be a circular plate or a strip plate arranged along the diameter of the annular structure; for example... Figure 8 As shown, the connecting member 42 can be a circular plate with the same diameter as the annular structure. This circular plate is positioned inside the annular structure and connects to its edge. The rotating rod 3 is positioned at the center of this circular plate to ensure that the downward pressure of the transmission guide mechanism 4 on the pressure plate 2 is consistent during rotation, i.e., the force is more uniform, ensuring the stability of the height of the threshing chamber 12. As another embodiment, to reduce the weight of the transmission guide mechanism 4, such as... Figure 6 , Figure 7As shown, the connector 42 can be a strip plate or a strip rod arranged along the diameter of the annular structure. Its lightweight structure helps reduce the weight of the transmission guide mechanism 4, improves the response speed of the adjustment transmission guide mechanism 4, and achieves the purpose of quickly adjusting the threshing height according to the diameter of the corn cob. Alternatively, the connector 42 can be a connecting plate with a diameter smaller than that of the annular structure. Connecting rods 421, one end of which connects to the connecting plate and the other end to the annular structure, are evenly distributed around the circumference of the connecting plate. The connecting plate can be a circular plate, a strip plate arranged along the diameter of the annular structure, or a strip rod arranged along the diameter of the annular structure. For details, please refer to [reference needed]. Figure 9 In the structure shown, a strip plate is used as the connector 42. The strip plate is welded onto the rotating rod 3 and rotates with the rotating rod 3. A connecting rod 421 is arranged circumferentially on the rotating rod 3, connecting the connector 42 to the annular structure through the connecting rod 421. Thus, when the rotating rod 3 drives the connector 42 to rotate, it synchronously drives the transmission guide mechanism 4 to rotate. The connector can also be a connecting plate that is larger than the annular structure. The connecting plate is set at the bottom of the guide part 41 and is in contact with the upper surface of the pressure plate 2. The connecting plate can be a circular plate, a strip plate arranged along the diameter of the annular structure, or a strip rod arranged along the diameter of the annular structure. For details, please refer to [reference needed]. Figure 10 In the structure shown, the connector 42 is a circular plate, the transmission guide mechanism 4 is located above the circular plate, and the rotating rod 3 is located at the center of the circular plate so that the connector 42 rotates while the transmission guide mechanism 4 rotates synchronously; the strip plate can be a rectangular plate or a rhomboid plate.

[0037] To prevent the contact point between the guide part 41 and the limiting member 5 from falling directly from the high end 411 of one guide part 41 to the low end 412 of the other guide part 41 during the rotation of the transmission guide mechanism 4 with the rotating rod 3, which would cause the pressure plate 2 to rebound rapidly and easily damage the compression spring 14, such as... Figures 1-8 As shown, the high end 411 of the guide part 41 is also provided with an upwardly extending limiting section 4111, the height of which is higher than that of the limiting member 5. By providing an upwardly extending limiting section 4111 on the high end 411 of the guide part 41, and the height of the limiting section 4111 being higher than that of the limiting member 5, when the transmission guide mechanism 4 rotates with the rotating rod 3, the limiting section 4111 is located on one side of the limiting member 5 when the high end 411 of the guide part 41 comes into contact with the limiting member 5, that is, the side of the limiting section 4111 abuts against the limiting member 5, so that the operator can no longer continue to rotate, thereby indicating to the operator that this is the lowest point of the pressure plate 2 pressing down. At the same time, it prevents the contact position between the guide part 41 and the limiting member 5 from falling directly from the high end 411 of one of the guide parts 41 to the low end 412 of the other guide part 41 connected to it, thus damaging the compression spring 14.

[0038] like Figure 2As shown, the limiting component 5 includes a limiting plate 51 disposed above the transmission guide mechanism 4. The lower end of the rotating rod 3 passes through the center of the limiting plate 51 and is connected to the transmission guide mechanism 4. The lower surface of the limiting plate 51 abuts against the guide surface 413. The two ends of the limiting plate 51 are provided with bent portions 511. The frame 1 is provided with upright plates 15 located at both ends of the limiting plate 51. Each upright plate 15 is provided with a positioning hole 151. Each bent portion 511 is provided with a strip hole 512 corresponding to the positioning hole 151. A bolt 513 is provided in the strip hole 512. The bolt 513 passes through the strip hole 512 and the positioning hole 151 in sequence and is threadedly connected to the positioning hole 151. Specifically, the limiting component 5 is a limiting plate 51 located above the transmission guide mechanism 4. The limiting plate 51 provides a rotation mounting point for the rotating rod 3 while limiting the left and right position of the rotating rod 3 to prevent the rotating rod 3 from shifting left and right during use. The lower surface of the position plate 51 cooperates with the guide surface 413 of the transmission guide mechanism 4, so that the transmission guide mechanism 4 is driven to rotate by the rotating rod 3, thereby controlling the guide surface 413 at different heights to contact the limit plate 51, and thus controlling the pressing height of the transmission guide mechanism 4 on the pressure plate 2, thereby adjusting the height of the threshing chamber 12. Vertical plates 15 are set on the frame 1 at both ends of the limit plate 51. The bent parts 511 at both ends of the limit plate 51 are detachably connected to the vertical plates 15 by bolts 513, so as to facilitate the disassembly and installation of the transmission guide mechanism 4 located between the limit member 5 and the pressure plate 2. Secondly, the vertical plate 15 is provided with positioning holes 151, and the bent parts 511 are provided with strip holes 512. By adjusting the position of the bolts 513 in the strip holes 512, the height position of the limit member 5 can be finely adjusted, expanding the height adjustment range of the height adjuster of the threshing chamber 12 of the corn thresher to meet different adjustment needs.

[0039] As another structure of the limiting plate 51, such as Figure 3 , Figure 4As shown, the limiting component 5 includes a limiting rod 52 and a connecting plate 521. The limiting rod 52 is disposed at both ends of the connecting plate 521. The lower end of the rotating rod 3 passes through the connecting plate 521 and connects to the transmission guide mechanism 4. The lower surface of the limiting rod 52 abuts against the guide surface 413. The frame 1 is provided with upright plates 15. Each upright plate 15 has an upward-opening positioning groove 152. The end of the limiting rod 52 away from the connecting plate 521 is provided with a threaded section. The threaded section is disposed in the positioning groove 152. Each threaded section is provided with a first nut 522 and a second nut 523 located on the left and right sides of the upright plate 15 to fix the limiting rod 52. The limiting component 5, made of the limiting rod 52 and the connecting plate 521, effectively reduces the weight of the limiting component 5. The connecting plate 521 provides a rotation mounting point for the rotating rod 3, while limiting the left and right positions of the rotating rod 3 to avoid... The rotating rod 3 deviates left and right during use. By using the limiting rod 52 in conjunction with the guide surface 413, the rotating rod 3 can drive the transmission guide mechanism 4 to rotate, thereby controlling the guide surface 413 at different heights to contact the limiting rod 52, and thus controlling the pressing height of the transmission guide mechanism 4 on the pressure plate 2, thereby adjusting the height of the threshing chamber 12. A vertical plate 15 is provided on the frame 1, and a positioning groove 152 is opened on the vertical plate 15. The limiting rod 52 has a threaded section away from the connecting rod 441, and the limiting rod 52 and the vertical plate 15 are detachably connected by the first nut 522 and the second nut 523, so as to facilitate the disassembly and installation of the transmission guide mechanism 4 located between the limiting part 5 and the pressure plate 2. At the same time, shims can be set between the first nut 522 and the vertical plate 15, and between the second nut 523 and the vertical plate 15 to ensure the connection stability between the limiting rod 52 and the vertical plate 15.

[0040] To ensure that the pressure plate 2 remains vertical during its lifting and lowering motion with the transmission guide mechanism 4, such as Figure 1 , Figure 2 As shown, the frame 1 is also equipped with positioning columns 21 located on both sides of the threshing chamber 12. The pressure plate 2 passes through the positioning columns 21 on both sides and is slidably connected to them. Multiple positioning columns 21 are spaced apart along the length of the frame 1. By setting positioning columns 21 on both sides of the threshing chamber 12 on the frame 1 and slidably connecting the pressure plate 2 to the positioning columns 21, the pressure plate 2 is restricted to moving only up and down along the height direction of the positioning columns 21 during lifting and lowering. This provides a stable guide for the pressure plate 2, ensuring it remains vertical during lifting and lowering, preventing offset and swaying, and guaranteeing the accuracy of the height adjustment of the threshing chamber 12. Furthermore, to ensure the pressure plate 2 can promptly return to the corresponding height, such as... Figure 1 , Figure 2As shown, each of the positioning columns 21 is fitted with a reset spring 211. One end of the reset spring 211 is located below the pressure plate 2, and the other end is located on the frame 1. By fitting the reset spring 211 on the positioning column 2, the pressure plate 2 can be quickly reset.

[0041] To lock the position of the rotating rod 3 and prevent it from rotating accidentally, and to further ensure that the transmission guide mechanism 4 does not shift due to vibration of the threshing chamber 12, such as... Figure 11 As shown, the frame 1 is also provided with a cover plate 6 located above the limiting rod 52. The upper end of the rotating rod 3 passes through the cover plate 6 and is rotatably connected to the cover plate 6. The cover plate 6 has multiple limiting holes 61, which are arranged circumferentially around the rotating rod 3 with the rotating rod 3 as the axis. The upper end of the rotating rod 3 is hinged with a rotating handle 31, which has an insertion part 32 facing the cover plate 6. The insertion part 32 is connected to the limiting hole 61. The rotating rod 3 is hinged with a rotating handle 31 so that the operator can rotate the rotating rod 3 by rotating the handle 31. The rotating handle 31 has an insertion part 32 facing the cover plate 6, which is connected to the limiting hole 61 on the cover plate 6. The connection is used to fix the position of the rotating rod 3, preventing accidental rotation of the rotating rod 3 and ensuring the stability of the height of the threshing chamber 12. Specifically, when it is necessary to rotate the rotating rod 3, the rotating handle 31 is lifted upward, that is, the insertion part 32 is pulled out from the limiting hole 61, and then it is rotated. When the rotating rod 3 is rotated to the designated position, the pressure plate 2 is pressed down to the corresponding position to adapt to the threshing of corn cobs of different diameters. The rotating handle 31 is pressed down, that is, the insertion part 32 is inserted into the limiting hole 61 to fix the position of the rotating rod 3. And since the insertion part 32 is inserted into the limiting hole 61 at an angle when the rotating handle 31 is pressed down, it will not easily slip off due to the vibration generated during the threshing of corn. As a preferred method, to ensure the tight connection between the insertion part 32 and the limiting hole 61, and to ensure that the insertion part 32 will not slip out of the limiting hole 61 due to vibration during the operation of the corn thresher, thus affecting the downward pressure of the transmission guide mechanism 4 on the pressure plate 2, such as... Figure 7 As shown, the insertion part 32 is also provided with an elastic connector 33 that connects to the rotating rod 3. By setting the elastic connector 33, when the operator rotates the rotating rod 3 to the corresponding position and inserts the insertion part 32 into the corresponding limiting hole 61, the insertion part 32 is fixed in the limiting hole 61 by the elastic connector 33, which has self-recovery properties, and is set between the insertion part 32 and the rotating rod 3. The elastic connector 33 can be a spring, a rubber band, etc. The insertion part 32 can be a straight rod that is vertically set below the rotating handle 31, or it can be an inclined rod with its lower end inclined towards the rotating rod 3. The number and arrangement of the limiting holes 61 can be designed according to the adjustable lifting distance of the pressure plate 2 and the required rotation angle of the guide part 41.

Claims

1. A height adjuster for the threshing chamber of a corn thresher, comprising a frame (1), a threshing chamber (12) inclined or horizontally disposed on the frame (1), and a compression spring (14) disposed on the top of the threshing chamber (12); characterized in that: It also includes a pressure plate (2), a limiting member (5), and a rotating rod (3). The pressure plate (2) is located above the threshing chamber (12) and connected to the compression spring (14). The limiting member (5) is located on the frame (1) and above the pressure plate (2). The vertically arranged rotating rod (3) passes through the limiting member (5) and is connected to the limiting member (5) in a transmission connection. The lower end of the rotating rod (3) is connected to a transmission guide mechanism (4) located between the limiting member (5) and the pressure plate (2). The transmission guide mechanism (4) includes a guide part (41), and the guide part (41) includes a high end (41). 1) and the lower end (412), the upper end (411) and the lower end (412) are provided with a smooth transition guide surface (413); the lower surface of the transmission guide mechanism (4) is in contact with the upper surface of the pressure plate (2), the guide surface (413) abuts against and cooperates with the lower surface of the limiting member (5); at least two guide parts (41) are provided, at least two guide parts (41) are arranged around the circumference of the rotating rod (3), and the upper end (411) of one guide part (41) is adjacent to the lower end (412) of the other guide part (41).

2. The height adjuster for the threshing chamber of a corn thresher as described in claim 1, characterized in that: The guide part (41) is a block structure, and the transmission guide mechanism (4) is an integral structure formed in one piece.

3. The height adjuster for the threshing chamber of a corn thresher as described in claim 1, characterized in that: The guide part (41) includes a vertically arranged arc plate (43), the upper surface of the arc plate (43) serves as the guide surface (413), and at least two arc plates (43) are arranged to form an annular structure coaxially with the rotating rod (3). The transmission guide mechanism (4) also includes a connector (42) connected to the annular structure and located within the annular structure. The connection position of the connector (42) with the annular structure is not higher than the lower end (412) of the arc plate (43), and the rotating rod (3) is connected to the connector (42).

4. The height adjuster for the threshing chamber of a corn thresher as described in claim 1, characterized in that: The guide part (41) includes a horizontally arranged guide ring (44) coaxially with the rotating rod (3). A connecting rod (441) is vertically arranged on the guide ring (44). At least two connecting rods (441) are evenly spaced on the guide ring (44). An arc-shaped rod (442) is provided between two adjacent connecting rods (441). One end of the arc-shaped rod (442) is connected to the high end (411) of one of the connecting rods (441), and the other end is connected to the low end of the adjacent connecting rod (441). (412) are connected, and the upper surface of the arc rod (442) serves as the guide surface (413). At least two arc rods (442) are arranged in a ring structure coaxially with the rotating rod (3). The transmission guide mechanism (4) also includes a connector (42) connected to the connecting rod (441) and located in the ring structure. The connection position of the connector (42) and the connecting rod (441) is not higher than the lower end (412) where the arc rod (442) and the connecting rod (441) are connected.

5. The height adjuster for the threshing chamber of a corn thresher as described in claim 1, characterized in that: The high end (411) of the guide part (41) is also provided with an upwardly extending limiting section (4111), the height of which is higher than that of the limiting member (5).

6. The height adjuster for the threshing chamber of a corn thresher as described in claim 1, characterized in that: The limiting component (5) includes a limiting plate (51) disposed above the transmission guide mechanism (4). The lower end of the rotating rod (3) passes through the center of the limiting plate (51) and is connected to the transmission guide mechanism (4). The lower surface of the limiting plate (51) abuts against the guide surface (413). The two ends of the limiting plate (51) are provided with bent portions (511). The frame (1) is provided with upright plates (15) located at both ends of the limiting plate (51). Each upright plate (15) is provided with a positioning hole (151). Each bent portion (511) is provided with a strip hole (512) corresponding to the positioning hole (151). A bolt (513) is provided in the strip hole (512). The bolt (513) passes through the strip hole (512) and the positioning hole (151) in sequence and is threadedly connected to the positioning hole (151).

7. The height adjuster for the threshing chamber of a corn thresher as described in claim 1, characterized in that: The limiting component (5) includes a limiting rod (52) and a connecting plate (521). The limiting rod (52) is set at both ends of the connecting plate (521). The lower end of the rotating rod (3) passes through the connecting plate (521) and connects with the transmission guide mechanism (4). The lower surface of the limiting rod (52) abuts against the guide surface (413). The frame (1) is provided with a vertical plate (15). Each vertical plate (15) is provided with an upward-opening positioning groove (152). The end of the limiting rod (52) away from the connecting plate (521) is provided with a threaded section. The threaded section is set in the positioning groove (152). Each threaded section is provided with a first nut (522) and a second nut (523) located on the left and right sides of the vertical plate (15) respectively to fix the limiting rod (52).

8. The height adjuster for the threshing chamber of a corn thresher as described in claim 1, characterized in that: The frame (1) is also provided with positioning columns (21) located on both sides of the threshing chamber (12). The two sides of the pressure plate (2) pass through the positioning columns (21) and are slidably connected to the positioning columns (21). Multiple positioning columns (21) are spaced apart on the frame (1) along the length direction of the frame (1).

9. The height adjuster for the threshing chamber of a corn thresher as described in claim 8, characterized in that: Each of the positioning columns (21) is fitted with a reset spring (211), one end of which is located below the pressure plate (2) and the other end is located on the frame (1).

10. A height adjuster for the threshing chamber of a corn thresher as described in any one of claims 1-9, characterized in that: The frame (1) is also provided with a cover plate (6) located above the limiting member (5). The upper end of the rotating rod (3) passes through the cover plate (6) and is rotatably connected to the cover plate (6). The cover plate (6) is provided with a plurality of limiting holes (61), and the plurality of limiting holes (61) are arranged circumferentially around the rotating rod (3) with the rotating rod (3) as the axis. The upper end of the rotating rod (3) is hinged with a rotating handle (31), and the rotating handle (31) is provided with a plug-in part (32) facing the cover plate (6), and the plug-in part (32) is connected to the limiting hole (61).

11. The height adjuster for the threshing chamber of a corn thresher as described in claim 10, characterized in that: The plug-in part (32) is also provided with an elastic connector (33) that connects to the rotating rod (3).

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