Agricultural machine gearbox transmission mechanism with overload protection function

Abstract

The invention discloses an agricultural machinery gearbox transmission mechanism with an overload protection function, and relates to the technical field of agricultural machinery transmission. The gearbox comprises a gearbox body, a clutch body, a guide shaft, an adjusting disc, a pressure spring, a regulation and control assembly and a synchronous control mechanism, the gearbox body is provided with an input shaft and double output shafts, the clutch body comprises a flywheel, a pressure plate and a friction plate, the friction plate is provided with a driving shaft, and the pressure plate is provided with a power shaft; the guide shafts are uniformly distributed and fixed on the flywheel and penetrate through the pressure plate telescopic hole, the adjusting plate is sleeved on the guide shafts, and the pressure spring is clamped between the adjusting plate and the pressure plate; the regulating assembly comprises a regulating threaded ring, a fixed threaded ring and a driving ring, and the synchronous control mechanism comprises a pull rod, a limiting block, a supporting plate and a pressing assembly. The clutch overcomes the defects that a traditional circumferentially-distributed spring type clutch is tedious in adjustment and uneven in pressing force, is high in adjustment efficiency and convenient to operate, can prolong the service life of parts, improves the running stability and overload protection reliability of a transmission system, and is suitable for the power transmission scene of a tractor and an agricultural machine gearbox.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural machinery transmission technology, in particular to a farm machinery gear box transmission mechanism with overload protection function. BACKGROUND

[0002] In the process of agricultural machinery operation, the gear box as the core transmission component, bears the key role of power transmission, speed change, torque change and power distribution, its performance directly affects the operation efficiency, stability and service life of the agricultural machinery. The operation environment of agricultural machinery is complex and changeable, often faces the extreme working conditions such as hard soil resistance, straw winding and sudden jamming of farm tools, which is easy to cause the transmission system to bear instantaneous overload torque. If there is no effective overload protection mechanism, it will cause the deformation and fracture of the key parts such as gears and shafts in the gear box, and even damage the tractor output shaft, causing serious equipment failure and economic loss.

[0003] In order to avoid the above risks, an overload protection device is usually added between the input shaft of the agricultural machinery gear box and the output shaft of the power source such as tractor in the prior art, and the most commonly used overload protection device is the clutch. There are many types of clutches, and the wrap spring clutch is widely used because of its simple structure and reliable operation. The overload protection torque of this type of clutch is mainly realized by adjusting the compression nuts at the ends of the wrap spring. Specifically, a plurality of nuts distributed along the circumference need to be adjusted respectively and staggered to achieve the preset spring compression force. When the torque exceeds the preset value, the friction plate will slide relatively between the flywheel and the pressure plate to achieve the purpose of overload protection.

[0004] However, the above adjustment method has obvious defects in actual application: on the one hand, the adjustment process needs to repeatedly calibrate the tightness of multiple nuts, which is tedious and inefficient, especially when emergency adjustment is carried out in the field of agricultural machinery operation, it is difficult to quickly complete the torque adaptation; on the other hand, since multiple nuts need to be adjusted manually, it is easy to cause inconsistent deviation in adjustment amount, resulting in uneven distribution of the compression force of the wrap spring on the pressure plate. This uneven force will directly act on the friction plate, causing a series of problems: first, the contact area between the friction plate and the pressure plate and the flywheel is reduced and the contact pressure is unbalanced, resulting in excessive local pressure, causing uneven wear of the friction plate, accelerating the wear rate and shortening the service life; second, uneven contact will cause the friction plate to heat up and concentrate, and local high temperature will easily cause the friction plate to ablate and deform, and even cause the phenomenon of slipping, making the overload protection function invalid; third, long-term uneven force will also cause plastic deformation of the spring, further aggravating the force disorder of the friction plate, forming a vicious cycle, which seriously affects the running stability and reliability of the clutch and the entire transmission system. SUMMARY

[0005] To solve the above-mentioned technical problems, the present invention provides a gearbox transmission mechanism for agricultural machinery that can efficiently and conveniently adjust the torque of the clutch and ensure a high uniformity of clamping force distribution, greatly reducing the adverse effects caused by human factors during torque adjustment, thereby enhancing the overload protection function of the invention.

[0006] The agricultural machinery gearbox transmission mechanism with overload protection function of the present invention includes a gearbox body and a clutch body. An input shaft is provided on the top side wall of the gearbox body, and output shafts are provided on both opposite side walls at its bottom. The clutch body includes a flywheel, a pressure plate, and friction plates coaxially pressed between the flywheel and the pressure plate. A drive shaft is coaxially provided on the side of the friction plate facing the flywheel, and the drive shaft is mounted on the center hole of the flywheel through a bearing sleeve. A power shaft is coaxially provided on the side of the pressure plate facing away from the flywheel, and the drive shaft is coaxially connected to the input shaft. The mechanism also includes: Several guide shafts are evenly distributed and fixedly installed on the edge of the flywheel facing the pressure plate, and each guide shaft is parallel to the axis of the flywheel. Several telescopic holes are provided through the edge of the side wall of the pressure plate facing the flywheel. The number and size of the telescopic holes are matched with the number of guide shafts. The guide shafts slide tightly through the telescopic holes. The adjusting plate is ring-shaped, and the surface of the adjusting plate facing the pressure plate is evenly provided with a number of protruding holes. The number and size of the protruding holes are adapted to the guide shafts. The guide shafts slide through the protruding holes in close contact. Each of the guide shafts is fitted with a compression spring, one end of which is in close contact with the pressure plate, and the other end of which is in close contact with the adjustment plate; The flywheel is equipped with an adjustment component on the side facing away from the pressure plate. The adjustment component is equipped with several synchronous control mechanisms. The adjustment component drives the adjustment plate to move under the limit of several guide shafts through the several synchronous control mechanisms. The movement of the adjustment plate is used to simultaneously and synchronously change the compression amount of several compression springs.

[0007] Furthermore, the control component includes a control threaded ring and a fixed threaded ring. The fixed threaded ring is coaxially mounted on the side wall of the flywheel facing away from the pressure plate. The drive shaft and its bearing sleeve are located inside the fixed threaded ring and do not contact each other. The fixed threaded ring is provided with an external thread, and the control threaded ring is provided with an internal thread that matches the external thread of the fixed threaded ring. The control threaded ring and the fixed threaded ring are threadedly connected. A drive ring is fixedly mounted on the side of the outer wall of the control threaded ring near the flywheel. The drive ring is used to synchronously drive the action of several synchronous control mechanisms.

[0008] Furthermore, the synchronization control mechanism includes pull rods and limit blocks. Several limit blocks are evenly distributed and fixedly installed on the outer circumferential side wall of the flywheel. Each limit block has a limit hole through its two opposite side walls in the flywheel axial direction. Several pull rods slide through the limit holes. A synchronization block is provided at the end of the pull rod facing the flywheel. Several synchronization blocks slide and fit tightly against the side wall of the drive ring facing away from the flywheel. Support plates can be detachably connected to the ends of several pull rods away from the adjusting threaded ring. Pressing components are provided on several support plates. Several support plates are pressed tightly against the surface of the adjusting plate facing away from the pressure plate by the pressing components. The contact parts of several pressing components and the adjusting plate are evenly distributed on the adjusting plate.

[0009] Furthermore, the clamping assembly includes clamping bolts, and several support plates are provided with clamping threaded holes through the inner side facing the adjusting plate. The clamping bolts are threadedly connected to the clamping threaded holes, and the clamping bolts are pressed tightly against the adjusting plate by the protective assembly.

[0010] Furthermore, the protective component is configured as a circular pad, which is coaxially fixedly connected to the clamping bolt.

[0011] Furthermore, the support plate is fixedly installed on the corresponding tie rod by multiple disassembly bolts.

[0012] Furthermore, the pull rod is configured as a multi-faceted rod, and the limiting hole is configured as a multi-faceted hole adapted to the multi-faceted rod.

[0013] Furthermore, the outer circumferential sidewall of the regulating threaded ring is evenly provided with a plurality of regulating levers, and the outer circumferential sidewall of the flywheel is evenly provided with a plurality of control levers.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Significantly improved adjustment efficiency: Through the cooperation of the adjustment component and the synchronous control mechanism, the compression of all compression springs can be adjusted synchronously at one time, without the need to calibrate multiple nuts one by one. The operation process is simplified, and it is especially suitable for emergency torque adaptation in field operations, greatly reducing the adjustment time.

[0015] 2. Optimized uniformity of clamping force distribution: The synchronous adjustment structure ensures that the compression of all springs is consistent, so that the clamping force of the pressure plate on the friction plate is evenly distributed in the circumference, thus avoiding the problem of force imbalance caused by traditional separate adjustment.

[0016] 3. Extend the service life of core components: The uniform distribution of clamping force reduces the risk of uneven wear, localized burning and deformation of the friction plate, while avoiding plastic deformation of the compression spring due to uneven force, thus extending the service life of key components such as friction plates, compression springs and pressure plates, and reducing equipment maintenance costs.

[0017] 4. Enhanced ease of operation: The control component is equipped with a control lever, and the synchronous control mechanism achieves synchronous power transmission through mechanical transmission. Torque adjustment can be completed without professional tools, reducing the skill requirements of operators and improving ease of use.

[0018] 5. Improved structural stability and reliability: The guide shaft guides and limits the pressure plate and adjustment plate, and the anti-rotation design of the multi-faceted rod and multi-faceted hole ensures that the movement trajectory of each component is accurate during the adjustment process, avoids deviation or jamming, and ensures the stability of the transmission system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the regulating threaded ring and the fixing threaded ring of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is the invention Figure 1 A magnified schematic diagram of the structure of part A in the diagram; Figure 5 This is the invention Figure 2 A magnified schematic diagram of the partial structure of B in the diagram; The following are labels in the attached diagram: 1. Gearbox body; 2. Input shaft; 3. Output shaft; 4. Flywheel; 5. Pressure plate; 6. Friction plate; 7. Drive shaft; 8. Power shaft; 9. Guide shaft; 10. Adjustment plate; 11. Compression spring; 12. Adjustment threaded ring; 13. Fixed threaded ring; 14. Drive ring; 15. Pull rod; 16. Limit block; 17. Synchronizing block; 18. Support plate; 19. Clamping bolt; 20. Circular pad; 21. Removal bolt; 22. Adjustment lever; 23. Control lever. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] like Figures 1 to 5 As shown, the agricultural machinery gearbox transmission mechanism with overload protection function of the present invention includes a gearbox body 1 and a clutch body. An input shaft 2 is provided on the top side wall of the gearbox body 1, and output shafts 3 are provided on both opposite side walls at its bottom. The clutch body includes a flywheel 4, a pressure plate 5, and a friction plate 6 coaxially pressed between the flywheel 4 and the pressure plate 5. A drive shaft 7 is coaxially provided on the side of the friction plate 6 facing the flywheel 4. The drive shaft 7 is mounted on the center hole of the flywheel 4 through a bearing sleeve. A power shaft 8 is coaxially provided on the side of the pressure plate 5 away from the flywheel 4. The drive shaft 7 is coaxially connected to the input shaft 2. The mechanism also includes: Several guide shafts 9 are evenly and fixedly installed on the edge of the flywheel 4 facing the pressure plate 5, and each guide shaft 9 is parallel to the axis of the flywheel 4. Several telescopic holes are provided through the edge of the side wall of the pressure plate 5 facing the flywheel 4. The number and size of the telescopic holes are matched with the number of guide shafts 9. Several guide shafts 9 slide tightly through several telescopic holes respectively. The adjusting plate 10 is configured as a ring, and the adjusting plate 10 facing the pressure plate 5 has a number of protruding holes evenly distributed through it. The number and size of the protruding holes are adapted to the guide shafts 9. The guide shafts 9 slide through the protruding holes respectively. Each of the guide shafts 9 is fitted with a compression spring 11, one end of which is in close contact with the pressure plate 5, and the other end of which is in close contact with the adjustment plate 10; The flywheel 4 is provided with an adjustment component on the side facing away from the pressure plate 5. The adjustment component is provided with several synchronous control mechanisms. The adjustment component drives the adjustment plate 10 to move under the limit of several guide shafts 9 through several synchronous control mechanisms. The movement of the adjustment plate 10 is used to simultaneously and synchronously change the compression amount of several compression springs 11. In this embodiment, Guide shaft 9: Evenly distributed and fixed on the edge of flywheel 4, parallel to the axis of flywheel 4, passing through the telescopic hole of pressure plate 5 and the extension hole of adjustment plate 10, serving as a guide and limiter, ensuring that pressure plate 5 and adjustment plate 10 can only slide along the axial direction, avoiding radial offset.

[0022] Adjustment disc 10: The ring structure is sleeved on the guide shaft 9 and serves as a support carrier for the compression spring 11. By moving axially, it synchronously squeezes or releases all the compression springs 11, thereby achieving uniform adjustment of the compression amount of the compression spring 11.

[0023] Compression spring 11: Sleeve on guide shaft 9, with both ends tightly attached to pressure plate 5 and adjustment plate 10 respectively, providing clamping force to pressure plate 5, so that friction plate 6 is tightly attached to flywheel 4 and pressure plate 5 to realize power transmission, and protection is achieved by friction plate 6 slipping between flywheel 4 and pressure plate 5 when overloaded.

[0024] Control component: Installed on the side of flywheel 4 facing away from pressure plate 5, it serves as the power input unit for torque adjustment and drives the synchronous control mechanism to move through mechanical transmission.

[0025] Synchronous control mechanism: connects the control component and the adjustment plate 10, and transmits the power of the control component to the adjustment plate 10 synchronously to ensure that the adjustment plate 10 moves smoothly and synchronously. The purpose of adjusting the clutch torque is achieved by changing the compression of the pressure spring 11.

[0026] As a preferred embodiment of the above, the control component includes a control threaded ring 12 and a fixed threaded ring 13. The fixed threaded ring 13 is coaxially mounted on the side wall of the flywheel 4 facing away from the pressure plate 5. The drive shaft 7 and its bearing sleeve are located inside the fixed threaded ring 13 and do not contact each other. The fixed threaded ring 13 is provided with an external thread. The control threaded ring 12 is provided with an internal thread that matches the external thread of the fixed threaded ring 13. The control threaded ring 12 is threadedly connected to the fixed threaded ring 13. A drive ring 14 is fixedly mounted on the side of the outer wall of the control threaded ring 12 near the flywheel 4. The drive ring 14 is used to synchronously drive the action of several synchronous control mechanisms. In this embodiment, Fixed threaded ring 13: Coaxially fixed to the side wall of flywheel 4, internally accommodating drive shaft 7 and bearing sleeve (without contact interference), providing external thread mating surface, and providing a basis for adjusting the installation and movement of threaded ring 12.

[0027] Adjustable threaded ring 12: It engages with fixed threaded ring 13 through internal thread, and moves axially along fixed threaded ring 13 when rotating, converting rotational motion into axial linear motion.

[0028] Drive ring 14: It is fixedly fitted on the outer wall of the regulating threaded ring 12 and closely attached to the synchronizing block 17 of the synchronizing control mechanism. It synchronously transmits the axial displacement of the regulating threaded ring 12 to all synchronizing control mechanisms to achieve even power transmission.

[0029] As a preferred embodiment of the above embodiment, the synchronization control mechanism includes a pull rod 15 and a limiting block 16. A plurality of limiting blocks 16 are evenly distributed and fixedly installed on the outer circumferential side wall of the flywheel 4. Each limiting block 16 has a limiting hole through its two opposite side walls in the axial direction of the flywheel 4. A plurality of pull rods 15 slide through the plurality of limiting holes. A synchronization block 17 is provided at the side wall of the pull rod 15 facing the flywheel 4. A plurality of synchronization blocks 17 slide and fit tightly against the side wall of the driving ring 14 facing away from the flywheel 4. A support plate 18 can be detachably connected to the end of the pull rod 15 away from the adjusting threaded ring 12. A pressing component is provided on the plurality of support plates 18. A plurality of support plates 18 are pressed tightly against the side of the adjusting plate 10 facing away from the pressure plate 5 by the pressing component. The contact parts of the plurality of pressing components and the adjusting plate 10 are evenly distributed on the adjusting plate 10. In this embodiment, Limiting blocks 16 are evenly distributed and fixed on the outer circumferential sidewall of the flywheel 4. The limiting holes through them provide a sliding channel for the pull rod 15, while limiting the radial displacement of the pull rod 15, ensuring that the pull rod 15 moves only along the axial direction.

[0030] Pull rod 15: Passes through the limiting hole, one end of which is attached to the drive ring 14 via the synchronizing block 17, and the other end is connected to the support plate 18, which plays the role of transmitting axial power and realizing the power connection between the control component and the adjustment plate 10.

[0031] Synchronizing block 17: Fixed to the end of the pull rod 15, it slides and fits tightly against the side wall of the drive ring 14 facing away from the flywheel 4, synchronously transmitting the axial thrust of the drive ring 14 to each pull rod 15, ensuring that all pull rods 15 move in the same direction.

[0032] Support plate 18: It is detachably connected to the end of the pull rod 15, providing a mounting carrier for the clamping assembly, and transmitting the power of the pull rod 15 to the adjustment plate 10.

[0033] Pressing assembly: Installed on the inner side of the support plate 18, it is pressed tightly against the side of the adjusting plate 10 facing away from the pressure plate 5, so as to achieve a stable connection between the support plate 18 and the adjusting plate 10.

[0034] As a preferred embodiment of the above, the clamping assembly includes a clamping bolt 19, and a plurality of support plates 18 are provided with clamping threaded holes through the inner side facing the adjusting plate 10. The clamping bolt 19 is threadedly connected to the clamping threaded holes, and the clamping bolt 19 is pressed tightly against the adjusting plate 10 by the protective assembly. In this embodiment, Clamping bolt 19: Engages with the clamping threaded hole of the support plate 18. By rotating to adjust the insertion length, the clamping force on the adjusting plate 10 can be finely adjusted to ensure that the adjusting plate 10 fits tightly with the support plate 18, while facilitating installation and disassembly. Protective component: It is installed between the clamping bolt 19 and the adjusting plate 10 to prevent the clamping bolt 19 from directly contacting the adjusting plate 10 and causing local crushing damage, while dispersing the clamping force and protecting the surface of the adjusting plate 10; In the initial state, the clamping bolt 19 is adjusted so that the protective component is tightly attached to the support plate 18. Then, the clamping force is adjusted using the adjusting disc 10. After the torque is adjusted, if the clutch runs smoothly and there is no uneven clamping force, the adjustment process is complete. However, if slight uneven clamping force occurs after adjustment due to the size error of the parts or installation problems, the clamping force of the adjusting disc 10 can be finely adjusted by using several clamping bolts 19 and the protective component.

[0035] As a preferred embodiment of the above, the protective component is configured as a circular pad 20, which is coaxially and fixedly connected to the clamping bolt 19. In this embodiment, Circular pad 20: It is fixed coaxially with the clamping bolt 19, which increases the contact area between the clamping bolt 19 and the adjusting plate 10, further disperses the clamping force, avoids excessive local force on the adjusting plate 10 and deformation, and improves the fit stability.

[0036] As a preferred embodiment of the above embodiment, the support plate 18 is fixedly mounted on the corresponding tie rod 15 by a plurality of disassembly bolts 21; In this embodiment, Disassembly and assembly bolt 21: Fix the support plate 18 to the end of the tie rod 15. The support plate 18 and the tie rod 15 can be detached and assembled by means of bolt connection, which facilitates the maintenance, replacement and debugging of the parts.

[0037] As a preferred embodiment of the above, the pull rod 15 is configured as a multi-faceted rod, and the limiting hole is configured as a multi-faceted hole adapted to the multi-faceted rod; In this embodiment, Multi-faceted rod (pull rod 15): It is adapted to the multi-faceted hole of the limiting block 16 to restrict the circumferential rotation of the pull rod 15, ensuring that the pull rod 15 moves only in a straight line along the axial direction, and avoiding synchronization deviation caused by the rotation of the pull rod 15 during power transmission.

[0038] Multi-faceted hole (limiting hole): works with the multi-faceted rod to achieve anti-rotation limit, ensure the power transmission accuracy of the synchronous control mechanism, and improve the smoothness of the movement of the adjustment plate 10.

[0039] As a preferred embodiment of the above, the outer circumferential sidewall of the regulating threaded ring 12 is provided with a plurality of regulating levers 22, and the outer circumferential sidewall of the flywheel 4 is provided with a plurality of control levers 23. In this embodiment, Adjustment lever 22: evenly distributed and fixed on the outer circumferential side wall of adjustment threaded ring 12, providing a force application point for the operator, making it easy to rotate adjustment threaded ring 12 to achieve axial adjustment, and reducing the difficulty of operation.

[0040] Control lever 23: It is evenly fixed to the outer circumferential side wall of the flywheel 4. During adjustment, the flywheel 4 can be fixed to prevent the flywheel 4 from rotating synchronously when the adjustment threaded ring 12 rotates, thus ensuring that the adjustment action is carried out smoothly. During the adjustment process, depending on the actual adjustment needs, extension steel pipes can be fitted onto the control lever 22 and the control lever 23 respectively, so that the final locking process is more labor-saving.

[0041] The working principle of this invention is as follows: The core working principle of this invention is to achieve synchronous adjustment of the clamping force of the compression spring 11 and overload protection function through the mechanical transmission logic of "rotation-axial movement-synchronous transmission". Power transmission basics: The tractor output shaft 3 drives the flywheel 4 to rotate through the power shaft 8. The flywheel 4 rotates synchronously through several guide shafts 9. The compression spring 11 presses the friction plate 6 onto the flywheel 4 through the adjusting plate 10 and the pressure plate 5. The power of the flywheel 4 is transmitted to the drive shaft 7 through the friction plate 6, and then through the input shaft 2 of the gearbox body 1 and the internal gear transmission, and then through the double output shaft 3 to the agricultural machinery actuator.

[0042] Torque adjustment process: When adjusting the overload protection torque, the operator fixes the control lever 23 of the flywheel 4 and rotates the adjustment lever 22 of the adjustment threaded ring 12, causing the adjustment threaded ring 12 to move axially along the external thread of the fixed threaded ring 13; the adjustment threaded ring 12 drives the driving ring 14 to move axially synchronously, and the driving ring 14 pushes all the synchronous blocks 17 and the pull rod 15 to move axially along the multi-faceted hole of the limit block 16; the pull rod 15 drives the adjustment plate 10 to move smoothly along the guide shaft 9 through the support plate 18 and the clamping assembly, synchronously changing the compression of all the compression springs 11, thereby adjusting the clamping force of the pressure plate 5 on the friction plate 6, and realizing the precise setting of the overload protection torque.

[0043] Overload protection mechanism: When agricultural machinery encounters overload conditions, the transmission torque exceeds the preset value, and relative slippage occurs between the friction plate 6, the flywheel 4, and the pressure plate 5, cutting off part of the power transmission and preventing damage to components such as the gearbox and tractor output shaft 3 due to overload, thus achieving overload protection.

[0044] Structural safeguards: The guide and limit mechanism of the guide shaft 9, the anti-rotation design of the multi-faceted rod and multi-faceted hole, and the power distribution of the synchronous control mechanism ensure that the movement of each component is synchronized and the force is uniform during the adjustment process, thus ensuring the stability and reliability of the transmission system.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A gearbox transmission mechanism for agricultural machinery with overload protection function, comprising a gearbox body (1) and a clutch body, wherein an input shaft (2) is provided on the top side wall of the gearbox body (1), and an output shaft (3) is provided on both opposite side walls at the bottom of the gearbox body (1); the clutch body comprises a flywheel (4), a pressure plate (5), and a friction plate (6) coaxially pressed between the flywheel (4) and the pressure plate (5); a drive shaft (7) is coaxially provided on the side of the friction plate (6) facing the flywheel (4); the drive shaft (7) is installed in the center hole of the flywheel (4) through a bearing sleeve; a power shaft (8) is coaxially provided on the side of the pressure plate (5) away from the flywheel (4); and the drive shaft (7) is coaxially connected to the input shaft (2), characterized in that, Also includes: Several guide shafts (9) are evenly distributed and fixedly installed on the edge of the flywheel (4) facing the pressure plate (5), and each guide shaft (9) is parallel to the axis of the flywheel (4). Several telescopic holes are provided through the edge of the side wall of the pressure plate (5) facing the flywheel (4). The number and size of the telescopic holes are matched with the number of guide shafts (9). Several guide shafts (9) slide through several telescopic holes respectively. Adjustment plate (10), the adjustment plate (10) is set in a ring shape, and the adjustment plate (10) facing the pressure plate (5) is evenly provided with a number of protruding holes. The number and size of the protruding holes are matched with the number of guide shafts (9). The several guide shafts (9) slide through the several protruding holes respectively. Each of the guide shafts (9) is fitted with a compression spring (11), one end of which is in close contact with the pressure plate (5), and the other end of which is in close contact with the adjustment plate (10); The flywheel (4) is provided with a control component on the side facing away from the pressure plate (5). The control component is provided with several synchronous control mechanisms. The control component drives the adjustment plate (10) to move under the limit of several guide shafts (9) through several synchronous control mechanisms. The movement of the adjustment plate (10) is used to simultaneously and synchronously change the compression amount of several compression springs (11).

2. The agricultural machinery gearbox transmission mechanism with overload protection function as described in claim 1, characterized in that, The control assembly includes a control threaded ring (12) and a fixed threaded ring (13). The fixed threaded ring (13) is coaxially mounted on the side wall of the flywheel (4) facing away from the pressure plate (5). The drive shaft (7) and its bearing sleeve are located inside the fixed threaded ring (13) and do not contact each other. The fixed threaded ring (13) is provided with an external thread. The control threaded ring (12) is provided with an internal thread that matches the external thread of the fixed threaded ring (13). The control threaded ring (12) is threadedly connected to the fixed threaded ring (13). The outer side wall of the control threaded ring (12) near the flywheel (4) is fixedly fitted with a drive ring (14). The drive ring (14) is used to synchronously drive several synchronous control mechanisms to move.

3. The agricultural machinery gearbox transmission mechanism with overload protection function as described in claim 2, characterized in that, The synchronization control mechanism includes pull rods (15) and limit blocks (16). Several limit blocks (16) are evenly distributed and fixedly installed on the outer circumferential side wall of the flywheel (4). Each limit block (16) has a limit hole through two opposite side walls in the axial direction of the flywheel (4). Several pull rods (15) slide through several limit holes. A synchronization block (17) is provided at the end of the pull rod (15) facing the flywheel (4). Several synchronization blocks (17) slide and fit tightly against the side wall of the drive ring (14) facing away from the flywheel (4). A support plate (18) can be detachably connected to the end of several pull rods (15) away from the adjustment threaded ring (12). A pressing component is provided on several support plates (18). Several support plates (18) are pressed tightly against the surface of the adjustment plate (10) facing away from the pressure plate (5) by the pressing component. The contact parts of several pressing components and the adjustment plate (10) are evenly distributed on the adjustment plate (10).

4. The agricultural machinery gearbox transmission mechanism with overload protection function as described in claim 3, characterized in that, The clamping assembly includes a clamping bolt (19), and several support plates (18) are provided with clamping threaded holes on the inner side facing the adjustment plate (10). The clamping bolt (19) is threadedly connected to the clamping threaded hole, and the clamping bolt (19) is squeezed and pressed tightly by the adjustment plate (10) through the protective assembly.

5. The agricultural machinery gearbox transmission mechanism with overload protection function as described in claim 4, characterized in that, The protective component is configured as a circular pad (20), which is coaxially fixedly connected to the clamping bolt (19).

6. The agricultural machinery gearbox transmission mechanism with overload protection function as described in claim 3, characterized in that, The support plate (18) is fixedly installed on the corresponding tie rod (15) by multiple disassembly bolts (21).

7. The agricultural machinery gearbox transmission mechanism with overload protection function as described in claim 3, characterized in that, The pull rod (15) is configured as a multi-faceted rod, and the limiting hole is configured as a multi-faceted hole adapted to the multi-faceted rod.

8. The agricultural machinery gearbox transmission mechanism with overload protection function as described in claim 2, characterized in that, The outer circumferential sidewall of the regulating threaded ring (12) is provided with several regulating levers (22), and the outer circumferential sidewall of the flywheel (4) is provided with several control levers (23).

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