Sitting tillage type rotary cultivator

Abstract

A sitting tillage type rotary cultivator comprises a walking gearbox and a rear rotary tillage gear transmission mechanism, a power input shaft of the walking gearbox is an auxiliary variable speed shaft, the rear rotary tillage gear transmission mechanism is connected and installed on the rear side of the walking gearbox, and the walking gearbox is connected and provided with a control handrail assembly. The control armrest assembly comprises a handle seat, an armrest, a steering handle, a steering pull wire and the like and is a common mechanism for a walking tractor, a walking wheel is mounted on a driving shaft of the walking gearbox, a seat is mounted on the rear side of the control armrest assembly through a sitting tillage beam, and a sitting tillage wheel is mounted on the lower portion of the sitting tillage beam. The rear rotary tillage gear transmission structure is hinged to the walking gearbox through a rotary connecting base, the rear rotary tillage gear transmission structure is in power transmission connection with the auxiliary variable-speed shaft, and a lifting connecting rod mechanism used for limiting the lower swing height of the rear rotary tillage gear transmission structure is installed on the sitting tillage beam. The rotary tillage transmission gear of the sitting tillage type rotary cultivator is not prone to damage, the tillage depth of the rotary blade can be automatically adjusted, and sitting tillage operation can be conveniently achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to a sitting-tillage rotary tiller. Background Art

[0002] Currently, the main components of a sitting-tillage rotary tiller on the market are a diesel engine, a frame, a rolling wheel, a speed change mechanism, a rotary tilling mechanism, an operating mechanism, a sitting-tillage beam, and a sitting-tillage tail wheel. The diesel engine is mounted on the frame and connected to the speed change mechanism via a belt drive. The rotary tillage mechanism meshes with the gears behind the speed change mechanism. The output power of the speed change mechanism drives the rolling wheel and rotary tillage mechanism. One end of the sitting-tillage beam is connected to the handrail frame of the operating mechanism, and the other end is equipped with a lifting tail wheel. The tilling depth of the rotary tillage mechanism is adjusted by adjusting the height of the sitting tail wheel. However, the height adjustment position of the sitting tail wheel is limited, which affects the adjustment of the tilling depth of the rotary tillage mechanism. In addition, the bench above the sitting tail wheel is where the operator sits. Adjusting the height of the sitting tail wheel will affect the operator's operating comfort. In addition, the operator sits at the back to operate the machine, causing the center of gravity to fall on the tail wheel of the whole machine, resulting in the tail end of the machine being heavy and the front end being light, which causes the drive wheel to slip easily and cannot move forward stably. Therefore, in order to solve the problem of insufficient power, some users replace and install a larger power engine.

[0003] Application research revealed that while installing a higher-power engine solved the power shortage, the resulting torque was high. This is because the power is input from the power input port, shifted by the auxiliary transmission gear, and then transmitted to the secondary shaft. This secondary shaft then splits the power into two paths: one to the rotary blade shaft for operation and the other to the drive shaft for propulsion. Both propulsion and rotary tillage output power pass through the auxiliary transmission gear and the first-gear drive gear. This pair of gears is prone to damage and shifting during operation. Structural limitations make replacement of this pair difficult, as replacement requires draining the transmission oil and damaging the seals on the mating surfaces. Furthermore, the high and low speed ratios of the auxiliary transmission differ significantly, making the high gear position typically only suitable for transport and transfer, not for rotary tillage. The rotary blades are also fixed at a fixed height, lacking automatic floating adjustment based on tillage resistance. As paddy fields deepen with each passing year, the tail wheel easily sinks, and maneuverability is poor when crossing ridges and ascending slopes. Therefore, a design for an improved, seated rotary tiller is needed. Summary of the Invention

[0004] The purpose of the utility model is to provide a sitting-tillage rotary tiller to address the problems existing in the prior art. The rotary tillage transmission gear of the sitting-tillage rotary tiller is not easily damaged, and the tillage depth of the rotary tiller can be automatically adjusted, thereby facilitating sitting-tillage operations.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A sitting-tillage rotary tiller comprises a travel gearbox and a rear rotary tillage gear transmission structure. The power input shaft of the travel gearbox is a secondary speed-change shaft. The rear rotary tillage gear transmission mechanism is connected and installed on the rear side of the travel gearbox. The travel gearbox is connected and installed with a control armrest assembly. The control armrest assembly includes a handle seat, an armrest, a steering handle and a steering cable, etc. It is a mechanism commonly used in walk-behind tractors. A travel wheel is installed on the drive shaft of the travel gearbox. A seat is installed on the rear side of the control armrest assembly through a sitting-tillage beam. A sitting-tillage wheel is installed at the lower part of the sitting-tillage beam. The rear rotary tillage gear transmission structure is hinged to the travel gearbox through a rotating connecting seat. The rear rotary tillage gear transmission structure is connected to the secondary speed-change shaft for power transmission. A lifting connecting rod mechanism for limiting the lowering height of the rear rotary tillage gear transmission mechanism is installed on the sitting-tillage beam.

[0007] Further preferred: the rear rotary tillage gear transmission structure includes a rotary tillage gearbox and a rotary tillage first-stage transmission box. The front end of the rotary tillage gearbox is rotationally connected to the walking gearbox through a rotating connecting seat. The rotary tillage gearbox is connected to the auxiliary speed change shaft through the rotary tillage first-stage transmission box for power transmission. The rear end of the rotary tillage gearbox is fixedly connected on both sides with a rearward extending mounting arm and a rotary tillage second-stage transmission box. The rotary tillage second-stage transmission box is connected to the rotary tillage gearbox for power transmission through the secondary transmission shaft. A rotary tillage shaft is rotatably installed between the mounting arm and the rotary tillage second-stage transmission box. A rotary tillage shaft is installed on the rotary tillage shaft. The end of the rotary tillage shaft extending into the rotary tillage second-stage transmission box is installed with a rotary tillage shaft gear for driving the rotary tillage shaft to rotate; a mudguard is fixedly installed above the mounting arm and the rotary tillage second-stage transmission box, and the mudguard is connected to the sitting beam through a lifting connecting rod mechanism.

[0008] The transmission gear of the present invention is a gear which is connected to the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to drive the transmission gear of the present invention to The rotary tillage speed change shaft in the tillage gearbox is equipped with a rotary tillage speed change driving gear, which is a double gear. The rotary tillage reduction shaft is equipped with a rotary tillage slow speed gear, a rotary tillage reduction driving gear and a rotary tillage fast gear. The secondary transmission shaft in the rotary tillage gearbox is equipped with a rotary tillage reduction passive gear. The rotary tillage reduction passive gear is constantly meshed with the rotary tillage reduction driving gear. When the rotary tillage speed change driving gear is meshed with the rotary tillage slow gear, a slow gear is obtained. When the rotary tillage speed change driving gear is meshed with the rotary tillage fast gear, a fast gear is obtained. One end of the secondary transmission shaft extends into the rotary tillage secondary transmission box and is equipped with a secondary driving gear. The secondary driving gear and the rotary tillage shaft gear are meshed with each other through power transmission of the transmission gear installed on the transmission shaft.

[0009] The lifting link mechanism comprises a rotating shaft, and the rotating shaft passes through the rotating shaft and is rotatably installed on the sitting tillage beam, and one end of the rotating shaft is fixedly connected to a linkage lifting rod, and the linkage lifting rod is hinged to the fender through a hinged lifting rod. At the other end of the rotating shaft is fixedly connected to a lifting arm. The rotating shaft can also pass through the sitting tillage beam and be fixedly installed. At this time, the lifting arm is rotatably connected with the rotating shaft, and the front end of the lifting arm is also hinged to the fender through a group of hinged lifting rods. The rear end of the lifting arm is provided with a laterally extending foot pedal rod, and a limiting protrusion is fixedly provided on the lifting arm between the foot pedal rod and the rotating shaft. A bolt adjustment seat is provided on the sitting tillage beam, and a limit adjustment bolt for pressing and limiting the limit protrusion is threadedly installed on the bolt adjustment seat. The rear end of the bolt adjustment seat is hinged to the limit rod or the sitting tillage beam at the rear end of the bolt adjustment seat is hinged to the limit rod, and one end of the limit rod is provided with a cross bar for the limit protrusion to engage and limit. The limit rod can be set to an L shape, and the horizontal end can be engaged and limited with the limit protrusion. The limit lever is rotated to avoid interference between the limit lever and the limit protrusion fixed on the lifting arm. The operator pedals the pedal lever with his foot, and through the principle of leverage, uses the lifting arm and the hinged lifting lever to swing the fender together with the rear rotary tillage gear transmission mechanism upward to a suitable position with the rotating connection seat as the hinge point. The limit adjustment bolt is then screwed in contact with the limit protrusion fixed on the lifting arm, thereby limiting the lowest swing position of the rear rotary tillage gear transmission mechanism. The operator then pedals the pedal lever with his foot, and through the principle of leverage, uses the lifting arm and the hinged lifting lever to swing the fender together with the rear rotary tillage gear transmission mechanism upward to the highest point with the rotating connection seat as the hinge point. The operator then rotates the limit lever to an upright position, and the lower end of the limit lever engages with the limit protrusion to limit the position, thereby raising the rear rotary tillage gear transmission mechanism to a limited position.

[0010] Further preferably, the travel gearbox is fixed to the frame by bolts, an engine is fixed to the frame by bolts, and a pulley of the engine is connected to the auxiliary speed-changing shaft of the travel gearbox through a drive belt and a clutch transmission mechanism.

[0011] Further preferred: the clutch transmission mechanism includes a clutch assembly and a clutch transmission case, the lower end of the clutch transmission case is fixedly connected to the travel gearbox, the auxiliary speed change shaft passes through the clutch transmission case, and the auxiliary speed change shaft in the clutch transmission case is installed with a driven gear. The intermediate rotating shaft and the clutch shaft are installed in the clutch transmission case above the driven gear from bottom to top, the clutch shaft is installed with a driving gear, and the intermediate rotating shaft is installed with an intermediate transmission gear. The driving gear is engaged with the driven gear through the intermediate transmission gear, and the clutch assembly is installed on the outer end of the clutch shaft extending out of the clutch transmission case.

[0012] Further preferred: the travel gearbox is sequentially installed with a counter-speed shaft, a second shaft, a main speed shaft, an intermediate shaft, a steering shaft, a reduction shaft and a drive shaft from top to bottom; the counter-speed shaft is installed with a counter-speed gear, the second shaft is installed with a Ⅱ gear driving gear, a Ⅲ gear driving gear, an 1 gear driving gear and a reverse gear; the main speed shaft is installed with ⅡⅢ gear driven gears, a central transmission driving gear and an 1 gear driven gear; the intermediate shaft is installed with an intermediate gear, the steering shaft is installed with a central transmission gear, the intermediate shafts on both sides of the central transmission gear are respectively installed with steering gears, the reduction gear and the reduction shaft gear are installed on the reduction shaft, the drive shaft is installed with a drive gear, and a reverse shaft is also installed in the travel gearbox, and a reverse gear intermediate gear is installed on the reverse shaft that is constantly meshed with the reverse gear. When the 1 gear driven gear is toggled to engage with the reverse gear intermediate gear, reverse gear is obtained.

[0013] The required power is transmitted from the clutch transmission mechanism through the engine and drive belt through the auxiliary transmission shaft into the travel gearbox. The auxiliary transmission fork shifts the auxiliary transmission gear, causing the auxiliary transmission gear to mesh with the 1st gear driving gear or the 3rd gear driving gear. When the auxiliary transmission gear meshes with the 1st gear driving gear, high gear is obtained. When the auxiliary transmission gear meshes with the 3rd gear driving gear, low gear is obtained. After the gears are engaged, power is transmitted to the second shaft, driving the gear installed on the second shaft to rotate. The reverse gear is always engaged with the reverse gear intermediate gear on the reverse shaft. When the 1st gear shift fork shifts the 1st gear driven gear to mesh with the 1st gear driving gear, 1st gear is obtained. When the 1st gear driven gear meshes with the reverse gear intermediate gear, reverse gear is obtained. When the 2nd and 3rd gear shift forks shift the 2nd and 3rd gear driven gear to mesh with the 3rd gear driving gear, 3rd gear is obtained. When the 2nd and 3rd gear driven gears are not engaged with other gears, neutral gear is obtained. The above gears cannot appear at the same time. When the gears are engaged, power is transmitted to the main transmission shaft. The central transmission driving gear on the main speed change shaft is constantly meshed with the intermediate gear on the intermediate shaft, which is then constantly meshed with the central transmission gear on the steering shaft. The steering gear and the reduction gear are constantly meshed, and then transmitted to the reduction shaft through the steering gear and the reduction gear. Finally, it is transmitted to the drive shaft through the reduction shaft gear and the drive gear to drive the travel wheels. The power of the rear rotary tillage gear transmission structure is transmitted to the rotary tillage transmission box through the auxiliary speed change shaft and the rotary tillage first-stage transmission box, and then transmitted to the rotary tillage second-stage transmission box through the rotary tillage transmission box to drive the rotary tillage blade shaft to rotate. When the shift fork shifts the rotary tillage speed change driving gear and meshes with the rotary tillage slow gear, it obtains a slow gear, and when the rotary tillage speed change driving gear and the rotary tillage fast gear, it obtains a fast gear.

[0014] This seated rotary tiller addresses the problems existing in existing solutions and has been optimized and improved in multiple aspects, including power distribution, gear design, speed ratio adjustment, connection method, ease of assembly and disassembly, and direction of blade shaft rotation. Specifically, power is input from one end of the auxiliary speed-change shaft and then split into two power paths. One path is output from the auxiliary speed-change shaft and is output through the rotary tillage primary transmission box, rotary tillage gearbox, and rotary tillage secondary transmission box to drive the rotary tiller shaft and rotary blade. The other path is transmitted through the auxiliary speed-change gears and other factors to the drive wheel to drive the entire machine. The rotary tiller power does not pass through the gear transmission in the travel gearbox, and the rotary tillage speed ratio is not affected by the travel gear position, achieving independent rotary tillage transmission. These improvements will help improve the durability, operability, operating efficiency, and safety of the machine, and solve the problems existing in the existing technology. In addition, the rear rotary tillage gear transmission structure is rotationally connected to the rear end of the travel gearbox through a rotating connecting seat, and the auxiliary speed change shaft and the power input shaft of the rear rotary tillage box are connected through the power transmission mechanism of the rotary tiller. The lowest swing position of the rear rotary tillage gear transmission structure can be limited by the lifting connecting rod mechanism, which can realize floating tillage of the rotary tiller, prevent the paddy field from deepening year by year, protect the water-retaining layer of the paddy field, and avoid the sudden increase in deep resistance causing insufficient power and stalling; when the sitting tillage wheel is stuck deep or passing over a field ridge or uphill, the rotary tiller can be freed by stepping on the control to lift it, and the lifting connecting rod mechanism can be used to adjust the tillage depth, which also facilitates the sitting tillage operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the present seated rotary tiller;

[0016] Figure 2 yes Figure 1 Schematic diagram of the rear view;

[0017] Figure 3 This is a schematic diagram of the power transmission relationship between the travel gearbox and the rotary tillage gearbox;

[0018] Figure 4 This is a schematic diagram of the power transmission relationship of the travel gearbox;

[0019] The names corresponding to the serial numbers in the figure are:

[0020] 1. Travel wheel, 2. Frame, 3. Engine, 4. Drive belt, 5. Clutch transmission mechanism, 6. Handrail assembly, 7. Sitting beam, 8. Articulated lifting rod, 9. Linkage lifting rod, 10. Rotating shaft, 11. Limit adjustment bolt, 12. Bolt adjustment seat, 13. Limit rod, 14. Lifting arm, 15. Seat, 16. Sitting wheel, 17. Fender, 18. Rotary blade, 19. Rotary blade shaft, 20. Mounting arm, 21. Rotary gearbox, 22. Rotary first transmission box, 23. Rotary second transmission box, 24. Clutch shaft, 25. Driving gear, 26. Intermediate transmission gear, 27. Driven gear, 28. First driving gear, 29. First intermediate gear, 30. First driven gear, 31. Rotary speed change shaft, 32. Rotary speed change driving gear, 33. Rotary slow speed gear, 34. Rotary speed reduction driving gear , 35. Rotary tillage fast gear, 36. Rotary tillage reduction passive gear, 37. Secondary transmission shaft, 38. Secondary driving gear, 39. Transmission shaft, 40. Transmission gear, 41. Rotary tillage shaft gear, 42. Drive shaft, 43. Drive gear, 44. Reduction shaft, 45. Reduction shaft gear, 46. Reduction gear, 47. Steering gear, 48. Steering shaft, 49. Central transmission gear, 50. Intermediate shaft, 51. Intermediate gear, 52. Main speed change shaft, 53. ⅡⅢ gear driven gear, 54. Second shaft, 55. Auxiliary speed change shaft, 56. Travel gearbox, 57. Auxiliary speed change gear, 58. Ⅱ gear driving gear, 59. 1 gear driving gear, 60. Reverse gear, 61. Ⅲ gear driving gear, 62. 1 gear passive gear, 63. Central transmission driving gear, 64. Rotating connecting seat, 65. Clutch transmission box, 66. Rotary tillage reduction shaft. DETAILED DESCRIPTION

[0021] In order to introduce the present invention in more detail, the present invention will be further described below in conjunction with embodiments and drawings. Example

[0022] A sitting-tillage rotary tiller includes a travel gearbox 56 and a rear rotary tillage gear transmission structure. The power input shaft of the travel gearbox 56 is a secondary speed-changing shaft 55. The rear rotary tillage gear transmission mechanism is connected and installed on the rear side of the travel gearbox 56. The travel gearbox 56 is connected and installed with an operating armrest assembly 6. A travel wheel 1 is installed on the drive shaft 42 of the travel gearbox 56. A seat 15 is installed on the rear side of the operating armrest assembly 6 through a sitting beam 7. A sitting wheel 16 is installed at the lower part of the sitting beam 7. The rear rotary tillage gear transmission structure is hinged to the travel gearbox 56 through a rotating connecting seat 64. The rear rotary tillage gear transmission structure is connected to the secondary speed-changing shaft 55 for power transmission. A lifting connecting rod mechanism for limiting the lowering height of the rear rotary tillage gear transmission mechanism is installed on the sitting beam 7.

[0023] The rear rotary tillage gear transmission structure includes a rotary tillage gearbox 21 and a rotary tillage first-stage transmission box 22. The front end of the rotary tillage gearbox 21 is rotationally connected to the walking gearbox 56 through a rotating connecting seat 64. The rotary tillage gearbox 21 is power-transmitted to the auxiliary speed-changing shaft 55 through the rotary tillage first-stage transmission box 22. The rear ends of the rotary tillage gearbox 21 are fixedly connected with the rearward-extending mounting arm 20 and the rotary tillage second-stage transmission box 23. The rotary tillage second-stage transmission box 23 is power-transmitted to the rotary tillage gearbox 21 through the secondary transmission shaft 37. A rotary tillage shaft 19 is rotatably installed between the mounting arm 20 and the rotary tillage second-stage transmission box 23. A rotary tillage blade 18 is installed on the rotary tillage shaft 19. The end of the rotary tillage shaft 19 extending into the rotary tillage second-stage transmission box 23 is installed with a rotary tillage shaft gear 41 for driving the rotary tillage shaft 19 to rotate; a mudguard 17 is fixedly installed above the mounting arm 20 and the rotary tillage second-stage transmission box 23, and the mudguard 17 is connected to the sitting beam 7 through a lifting connecting rod mechanism.

[0024] The rotary tillage gearbox 21 is rotatably installed with a rotary tillage speed change shaft 31, a rotary tillage reduction shaft 66 and a secondary transmission shaft 37 from front to back. The outer rings of the bearing covers on both sides of the rotary tillage gearbox 21 at the position of the rotary tillage speed change shaft 31 are rotatably connected to the rotating connecting seat 64 through bearings. The rotating connecting seat 64 is fixedly connected to the walking gearbox 56 by bolts. One end of the rotary tillage speed change shaft 31 extends into the rotary tillage primary transmission box 22 and is equipped with a primary passive gear 30. The rotary tillage speed change shaft 31 is rotatably connected to the rotary tillage primary transmission box 22 through a bearing. One end of the auxiliary speed change shaft 55 also extends into the rotary tillage primary transmission box 22 and is equipped with a primary driving gear 28. The primary driving gear 28 and the primary passive gear 30 are engaged in power transmission through a primary intermediate gear 29 installed on the rotating shaft. The rotary tillage speed change shaft 31 is equipped with a rotary tillage speed change driving gear 32, which is a double gear. The rotary tillage reduction shaft 66 is equipped with a rotary tillage slow speed gear 33, a rotary tillage reduction driving gear 34 and a rotary tillage fast gear 35. The secondary transmission shaft 37 in the rotary tillage gearbox 21 is equipped with a rotary tillage reduction driven gear 36. The rotary tillage reduction driven gear 36 is constantly meshed with the rotary tillage reduction driving gear 34. When the rotary tillage speed change driving gear 32 is engaged with the rotary tillage slow speed gear 33, a slow gear is obtained. When the rotary tillage speed change driving gear 32 is engaged with the rotary tillage fast gear 35, a fast gear is obtained. One end of the secondary transmission shaft 37 extends into the rotary tillage secondary transmission box 23 and is equipped with a secondary driving gear 38. The secondary driving gear 38 and the rotary tillage shaft gear 41 are engaged in power transmission through a transmission gear 40 installed on a transmission shaft 39.

[0025] The lifting link mechanism includes a rotating shaft 10, which is horizontally penetrated and rotatably mounted on the sitting tillage beam 7. One end of the rotating shaft 10 is fixedly connected to a linkage lifting rod 9, which is hinged to the fender 17 through a hinged lifting rod 8. The other end of the rotating shaft 10 is fixedly connected to a lifting arm 14. The rotating shaft 10 can also be horizontally penetrated and fixedly mounted on the sitting tillage beam 7. At this time, the lifting arm 14 is rotatably connected to the rotating shaft 10, and the front end of the lifting arm 14 is also hinged to the fender 17 through a set of hinged lifting rods 8. The rear end of the lifting arm 14 is provided with a horizontal extension. A foot pedal is provided, and a limiting protrusion is fixedly provided on the lifting arm 14 between the foot pedal and the rotating shaft 10. A bolt adjustment seat 12 is provided on the sitting beam 7. A limit adjustment bolt 11 for pressing and limiting the limiting protrusion is threadedly installed on the bolt adjustment seat 12. The rear end of the bolt adjustment seat 12 is hinged to a limiting rod 13 or the sitting beam 7 at the rear end of the bolt adjustment seat 12 is hinged to a limiting rod 13. One end of the limiting rod 13 is provided with a cross bar for clamping and limiting the limiting protrusion. The limiting rod can be set to an L shape, and the horizontal end can be clamped and limited with the limiting protrusion. The limit rod 13 is rotated to avoid interference between the limit rod 13 and the limit protrusion fixed on the lifting arm 14. The operator pedals the pedal rod and, through the principle of leverage, utilizes the lifting arm 14 and the hinged lifting rod 8 to swing the fender 17 and the rear rotary tillage gear transmission mechanism upward to a suitable position with the rotating connection seat as the hinge point. The limit adjustment bolt is then screwed in contact with the limit protrusion fixed on the lifting arm, thereby limiting the lowest swing position of the rear rotary tillage gear transmission mechanism. The operator then pedals the pedal rod and, through the principle of leverage, utilizes the lifting arm and the hinged lifting rod to swing the fender 17 and the rear rotary tillage gear transmission mechanism upward to the highest point with the rotating connection seat as the hinge point. The operator then rotates the limit rod to an upright position, and the lower end of the limit rod engages with the limit protrusion to limit the position, thereby raising the rear rotary tillage gear transmission mechanism to a limited position.

[0026] The travel gearbox 56 is fixed to the frame 2 by bolts, and the engine 3 is fixed to the frame 2 by bolts. The pulley of the engine 3 is connected to the auxiliary speed change shaft 55 of the travel gearbox 56 through the drive belt 4 and the clutch transmission mechanism 5.

[0027] The clutch transmission mechanism 5 includes a clutch assembly and a clutch transmission box 65. The lower end of the clutch transmission box 65 is fixedly connected to the travel gearbox 56. The auxiliary speed change shaft 55 passes through the clutch transmission box 65. The auxiliary speed change shaft 55 in the clutch transmission box 65 is mounted with a driven gear 27. The intermediate rotating shaft and the clutch shaft 24 are mounted in the clutch transmission box 65 above the driven gear 27 from bottom to top. The driving gear 25 is mounted on the clutch shaft 24, and the intermediate transmission gear 26 is mounted on the intermediate rotating shaft. The driving gear 25 is power-transmitted in mesh with the driven gear 27 through the intermediate transmission gear 26. The clutch assembly is mounted on the outer end of the clutch shaft 24 extending from the clutch transmission box 65.

[0028] The travel gearbox 56 is provided with a secondary transmission shaft 55, a second shaft 54, a main transmission shaft 52, an intermediate shaft 50, a steering shaft 48, a reduction shaft 44 and a drive shaft 42 from top to bottom. The secondary transmission shaft 55 is provided with a secondary transmission gear 57. The second shaft 54 ​​is provided with a Ⅱ gear driving gear 58, a Ⅲ gear driving gear 61, a 1 gear driving gear 59 and a reverse gear 56. The main transmission shaft 52 is provided with a Ⅱ Ⅲ gear driven gear 53, a central transmission driving gear 63 and a 1 gear driven gear 62. An intermediate gear 51 is installed on the shaft 50, a central transmission gear 49 is installed on the steering shaft 48, and steering gears 47 are respectively installed on the intermediate shafts 50 on both sides of the central transmission gear 49. A reduction gear 46 and a reduction shaft gear 45 are installed on the reduction shaft 44. A drive gear 43 is installed on the drive shaft 42. A reverse gear shaft is also installed in the travel gearbox 56, and a reverse gear intermediate gear is installed on the reverse gear shaft that is constantly engaged with the reverse gear 56. When the I gear driven gear 62 is toggled to engage with the reverse gear intermediate gear, reverse gear is obtained.

[0029] The required power is transmitted from the clutch transmission mechanism 5 through the auxiliary speed-change shaft 55 into the travel gearbox 56 through the engine 3 and the drive belt 4. The auxiliary speed-change fork shifts the auxiliary speed-change gear 57, so that the auxiliary speed-change gear 57 is engaged with the I gear driving gear 55 or the III driving gear 57. When the auxiliary speed-change gear 57 is engaged with the I gear driving gear 55, a high gear is obtained. When the auxiliary speed-change gear 57 is engaged with the III driving gear 57, a low gear is obtained. After the gears are engaged, the power is transmitted to the second shaft 54, driving the gears installed on the second shaft 54 ​​to rotate. The reverse gear 56 is often engaged with the reverse intermediate gear on the reverse shaft. When the I-gear shift fork shifts the I-gear driven gear 58 to engage the I-gear driving gear 55, I-gear is achieved. When the I-gear driven gear 58 engages the reverse gear intermediate gear, reverse gear is achieved. When the II-III-gear shift fork shifts the II-III-gear driven gear 53 to engage the III-gear driving gear 57, III-gear is achieved. When the II-III-gear driven gear 53 engages the II-gear driving gear 58, II-gear is achieved. When the I-gear driven gear 58 and the II-III-gear driven gear 53 are not engaged with other gears, neutral gear is achieved. These gear positions cannot be simultaneously present. When the gears are engaged, power is transmitted to the main transmission shaft 52. The central transmission driving gear 63 on the main transmission shaft 52 is constantly meshed with the intermediate gear 51 on the intermediate shaft 50. The intermediate gear 51 is constantly meshed with the central transmission gear 49 on the steering shaft 48. The steering gear 47 is constantly meshed with the reduction gear 46. The power is then transmitted to the reduction shaft 44 via the steering gear 47 and the reduction gear 46. Finally, it is transmitted to the drive shaft 42 via the reduction shaft gear 45 and the drive gear 43, driving the travel wheels. The power of the rear rotary tillage gear transmission structure is transmitted to the rotary tillage gearbox 21 through the auxiliary speed change shaft 55 and the corresponding shafts and gears in the rotary tillage first-level transmission box 22, and then transmitted to the rotary tillage second-level transmission box 23 through the corresponding shafts and gears in the rotary tillage gearbox 21. It is used to drive the rotary tillage blade shaft 19 to rotate through the corresponding shafts and gears. When the shift fork shifts the rotary tillage speed driving gear 32 and engages with the rotary tillage slow gear 33, it obtains a slow gear, and when the rotary tillage speed driving gear 32 and the rotary tillage fast gear 35 engage, it obtains a fast gear.

[0030] The above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the scope of protection of the present invention.

Claims

1. A sitting tillage type rotary tiller, comprising a travel gearbox (56) and a rear rotary tillage gear transmission structure, wherein the power input shaft of the travel gearbox (56) is a secondary speed change shaft (55), the rear rotary tillage gear transmission mechanism is connected and mounted on the rear side of the travel gearbox (56), the travel gearbox (56) is connected and mounted with a control armrest assembly (6), a travel wheel (1) is mounted on the drive shaft (42) of the travel gearbox (56), a seat (15) is mounted on the rear side of the control armrest assembly (6) through a sitting tillage beam (7), and a sitting tillage wheel (16) is mounted on the lower part of the sitting tillage beam (7), characterized in that: The rear rotary tillage gear transmission structure is hinged to the travel gearbox (56) via a rotating connecting seat (64), and the rear rotary tillage gear transmission structure is connected to the auxiliary speed change shaft (55) for power transmission. A lifting connecting rod mechanism for limiting the lowering height of the rear rotary tillage gear transmission mechanism is installed on the sitting tillage beam (7).

2. The seated rotary tiller according to claim 1, characterized in that: The rear rotary tillage gear transmission structure comprises a rotary tillage gearbox (21) and a rotary tillage first-stage transmission box (22). The front end of the rotary tillage gearbox (21) is rotationally connected to the travel gearbox (56) via a rotating connecting seat (64). The rotary tillage gearbox (21) is connected to the auxiliary speed change shaft (55) through the rotary tillage first-stage transmission box (22) for power transmission. The rear end of the rotary tillage gearbox (21) is fixedly connected to a mounting arm (20) extending backward and a rotary tillage second-stage transmission box (23) on both sides. The rotary tillage second-stage transmission box (23) is connected to the rotary tillage gearbox via a secondary transmission shaft (37). The rotary tillage blade shaft (19) is rotatably mounted between the mounting arm (20) and the rotary tillage secondary transmission box (23), a rotary tillage blade (18) is mounted on the rotary tillage blade shaft (19), and a rotary tillage shaft gear (41) for driving the rotary tillage blade shaft (19) to rotate is mounted on the end of the rotary tillage blade shaft (19) extending into the rotary tillage secondary transmission box (23); a fender (17) is fixedly mounted above the mounting arm (20) and the rotary tillage secondary transmission box (23), and the fender (17) is connected to the sitting beam (7) through a lifting connecting rod mechanism.

3. The seated rotary tiller according to claim 2, characterized in that: The rotary tillage gearbox (21) is rotatably installed with a rotary tillage speed change shaft (31), a rotary tillage reduction shaft (66) and a secondary transmission shaft (37) from front to back. The outer rings of the bearing caps on both sides of the rotary tillage gearbox (21) at the position of the rotary tillage speed change shaft (31) are rotatably connected to the rotating connecting seat (64) through bearings. The rotating connecting seat (64) is fixedly connected to the travel gearbox (56) through bolts. One end of the rotary tillage speed change shaft (31) extends into the rotary tillage first-stage transmission box (22) and is installed with a first-stage passive gear (30). The rotary tillage speed change shaft (31) is rotatably connected to the rotary tillage first-stage transmission box (22) through bearings. One end of the auxiliary speed change shaft (55) also extends into the rotary tillage first-stage transmission box (22) and is installed with a first-stage driving gear (28). The first-stage driving gear (28) and the first-stage passive gear (30) are connected by a shaft mounted on the rotating shaft. The intermediate gear (29) is engaged in power transmission, a rotary tillage speed change shaft (31) in the rotary tillage gearbox (21) is provided with a rotary tillage speed change driving gear (32), the rotary tillage speed change driving gear (32) is a double gear, a rotary tillage speed reduction shaft (66) is provided with a rotary tillage slow speed gear (33), a rotary tillage speed reduction driving gear (34) and a rotary tillage fast gear (35), a secondary transmission shaft (37) in the rotary tillage gearbox (21) is provided with a rotary tillage speed reduction passive gear (36), the rotary tillage speed reduction passive gear (36) is constantly engaged with the rotary tillage speed reduction active gear (34), one end of the secondary transmission shaft (37) extends into the rotary tillage secondary transmission box (23) and is provided with a secondary driving gear (38), and power transmission is engaged between the secondary driving gear (38) and the rotary tillage shaft gear (41) through a transmission gear (40) installed on the transmission shaft (39).

4. The seated rotary tiller according to claim 1 or 2, characterized in that: The lifting link mechanism includes a rotating shaft (10), which is laterally penetrated and rotatably mounted on the sitting and tilling beam (7), one end of the rotating shaft (10) is fixedly connected to a linkage lifting rod (9), which is hinged to the fender (17) through a hinged lifting rod (8), and the other end of the rotating shaft (10) is fixedly connected to a lifting arm (14), the front end of the lifting arm (14) is also hinged to the fender (17) through a set of hinged lifting rods (8), and the rear end of the lifting arm (14) is provided with a laterally extending footrest. A limiting protrusion is fixedly provided on the lifting arm (14) between the pedal rod and the rotating shaft (10), a bolt adjustment seat (12) is provided on the sitting and tilling beam (7), a limiting adjustment bolt (11) for pressing and limiting the limiting protrusion is threadedly installed on the bolt adjustment seat (12), a limiting rod (13) is hingedly connected to the rear end of the bolt adjustment seat (12) or the sitting and tilling beam (7) at the rear end of the bolt adjustment seat (12), and one end of the limiting rod (13) is provided with a cross bar for clamping and limiting the limiting protrusion.

5. The seated rotary tiller according to claim 1, characterized in that: The travel gearbox (56) is fixedly mounted on the frame (2) by bolts, and an engine (3) is fixed on the frame (2) by bolts. The pulley of the engine (3) is connected to the auxiliary speed change shaft (55) of the travel gearbox (56) through a drive belt (4) and a clutch transmission mechanism (5) for power transmission.

6. The seated rotary tiller according to claim 5, characterized in that: The clutch transmission mechanism (5) includes a clutch assembly and a clutch transmission box (65). The lower end of the clutch transmission box (65) is fixedly connected to the travel gearbox (56). The auxiliary speed change shaft (55) passes through the clutch transmission box (65). A driven gear (27) is installed on the auxiliary speed change shaft (55) in the clutch transmission box (65). An intermediate rotating shaft and a clutch shaft (24) are installed in sequence from bottom to top in the clutch transmission box (65) above the driven gear (27). A driving gear (25) is installed on the clutch shaft (24). An intermediate transmission gear (26) is installed on the intermediate rotating shaft. The driving gear (25) is power-transmittedly engaged with the driven gear (27) through the intermediate transmission gear (26). The clutch assembly is installed on the outer end of the clutch shaft (24) extending out of the clutch transmission box (65).

7. The seated rotary tiller according to claim 1, characterized in that: The travel gearbox (56) is provided with a secondary speed change shaft (55), a second shaft (54), a main speed change shaft (52), an intermediate shaft (50), a steering shaft (48), a reduction shaft (44) and a drive shaft (42) from top to bottom. The secondary speed change shaft (55) is provided with a secondary speed change gear (57). The second shaft (54) is provided with a Ⅱ gear driving gear (58), a Ⅲ gear driving gear (61), a 1 gear driving gear (59) and a reverse gear (60). The main speed change shaft (52) is provided with a Ⅱ Ⅲ gear driven gear (53), a central transmission driving gear (63) and a 1 gear driven gear (62). ), an intermediate gear (51) is installed on the intermediate shaft (50), a central transmission gear (49) is installed on the steering shaft (48), and steering gears (47) are installed on the intermediate shafts (50) on both sides of the central transmission gear (49), a reduction gear (46) and a reduction shaft gear (45) are installed on the reduction shaft (44), a drive gear (43) is installed on the drive shaft (42), and a reverse gear shaft is also installed in the travel gearbox (56). A reverse gear intermediate gear that is constantly meshed with the reverse gear (60) is installed on the reverse gear shaft. When the I gear driven gear (62) is turned to mesh with the reverse gear intermediate gear, reverse gear is obtained.

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