A planting transmission system and planting device capable of rapid speed change and fixed-point locking.

Abstract

This invention relates to a planting transmission system and planting device capable of quick speed change and fixed-point locking. The system includes an input shaft connected to an output shaft via a power transmission mechanism. The power transmission mechanism includes a first transmission system and a second transmission system. The first transmission system includes a first transmission shaft rotatably connected to a housing, connected to the input shaft via a first transmission assembly. A first gear set is fixed to the first transmission shaft. The second transmission system includes a second transmission shaft rotatably connected to the housing, equipped with a second gear set meshing with the first gear set. A shifting mechanism is provided between the second gear set and the second transmission shaft to switch between locking and contact locking states of different gears in the second gear set with the second transmission shaft. The second transmission shaft is connected to the output shaft via a second transmission assembly. Using this transmission system, speed adjustment is convenient and quick, saving agricultural time.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a planting transmission system and planting device capable of quick speed change and fixed-point locking. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Transplanting is a unique step in agricultural production, typically consisting of a seedling supply system, a seedling delivery system, and a planting system. In mechanized operations, to ensure planting efficiency and quality, the seedling delivery and planting systems require precise timing and spatial coordination. When turning or transferring seedlings in the field, this relationship must be maintained; otherwise, readjustment is necessary. Disruption of this relationship wastes time and manpower, delaying planting operations. Currently, planting systems often use clutches to directly disconnect the power supply from the planting power supply during field turns or transfers to prevent damage during non-operational conditions. However, existing clutches only disengage the power; the planting mechanism's stopping position is random and lacks position holding. After disengagement, when the planting mechanism is at its highest point, it will slide down to the lowest point under its own weight, affecting transportation and frequently causing misalignment with the seedling delivery system. Therefore, the entire machine needs to be readjusted after each transport.

[0004] Furthermore, to ensure yield per acre, different varieties and different soil conditions require adjustments to plant spacing during planting operations to achieve either denser or sparser planting to increase crop yield. Currently, plant spacing adjustment is often achieved by replacing sprockets and adjusting the transmission speed ratio. This process requires growers to have certain hands-on skills, mechanical repair knowledge, and specialized disassembly tools, and is time-consuming, labor-intensive, and disrupts planting schedules. Therefore, a planting transmission system is needed. On the one hand, this system should be able to lock at designated positions to ensure synchronization with the seedling delivery mechanism and facilitate turning and maneuvering. On the other hand, it should enable rapid adjustment of plant spacing in the transplanting device without disassembly, improving the efficiency and quality of mechanized planting. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a planting transmission system that can quickly change speed and lock at a fixed point. The plant spacing can be adjusted conveniently and quickly, improving the efficiency and quality of mechanized planting. At the same time, it can keep the planting mechanism in the required position, ensuring the timing with the seedling delivery mechanism, and facilitating turning and maneuvering.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a planting transmission system capable of rapid speed change and fixed-point locking, comprising an input shaft connected to an output shaft via a power transmission mechanism. The power transmission mechanism includes a first transmission system and a second transmission system. The first transmission system includes a first transmission shaft rotatably connected to a housing, which is connected to the input shaft via a first transmission assembly. A first gear set is fixed to the first transmission shaft. The second transmission system includes a second transmission shaft rotatably connected to the housing, which is provided with a second gear set meshing with the first gear set. A shifting mechanism is provided between the second gear set and the second transmission shaft to achieve switching between different gears of the second gear set and the second transmission shaft in a locking and contact locking state. The second transmission shaft is connected to the output shaft via a second transmission assembly.

[0008] Optionally, the shifting mechanism includes a sliding base, which is slidably connected to the second drive shaft. A pin is provided in the opening at the edge of the sliding base, and a torsion spring is provided on the outer periphery of the pin. The torsion spring is connected to a locking key and a clamping plate. The locking key and the clamping plate extend into the first keyway opened in the second drive shaft. The clamping plate presses against the bottom surface of the first keyway under the elastic force of the torsion spring. The end of the locking key is provided with a protrusion, which can be engaged into the second keyway of each gear of the second gear set under the elastic force of the torsion spring.

[0009] Furthermore, a retaining ring is provided between adjacent gears of the second gear set, and the retaining ring is fixed to the outer circumference of the second transmission shaft.

[0010] Optionally, the sliding base is rotatably connected to one end of the first connecting arm, and the other end of the first connecting arm is provided with a central shaft, which extends out of the housing and is connected to a gear shift handle.

[0011] Optionally, the first transmission component may employ a chain drive mechanism.

[0012] Optionally, the second transmission assembly includes a drive gear fixed to the second transmission shaft, the drive gear meshing with a driven gear rotatably connected to the first transmission shaft, the driven gear having a second drive sprocket fixed to it, the second drive sprocket being rotatably connected to the first transmission shaft, and the second drive sprocket being connected to the output shaft via a chain drive mechanism.

[0013] Optionally, the power output end of the second transmission component is connected to the output shaft via a clutch, and the housing is also provided with a braking mechanism that cooperates with the output shaft.

[0014] Optionally, the clutch includes a limiting shaft, which is parallel to the output shaft and fixed to the housing. The limiting shaft is slidably connected to a limiter, which has a locking block that engages with a slot in the base. The base has a housing on one side and a rear wheel on the other side. The rear wheel is rotatably connected to the base, and an elastic element is provided between the rear wheel and the base. The housing is connected to the second transmission assembly, and an adjusting valve core is provided inside the housing. A locking element is provided between the adjusting valve core and the housing. Both the adjusting valve core and the rear wheel are fixedly connected to the output shaft.

[0015] Optionally, the adjusting valve core is fitted with a mounting ring fixed to the base, the housing is fitted around the mounting ring, and the locking element is set in a locking element mounting groove opened in the mounting ring. The surface of the adjusting valve core that contacts the locking element is an alternating plane and an outwardly convex arc surface.

[0016] Optionally, the limiter adopts a cylindrical structure sleeved on the outer periphery of the limit shaft, one end of the limiter is connected to one end of the second connecting arm, and the other end of the second connecting arm is connected to the start handle extending out of the housing.

[0017] Secondly, embodiments of the present invention provide a planting device equipped with the planting transmission system described in the first aspect, which enables rapid speed change and fixed-point locking.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. The transmission system of the present invention is provided with a shifting mechanism, which can switch between the circumferential locking and contact locking states of each gear of the second gear set and the second transmission shaft. Thus, the shifting mechanism can achieve circumferential fixing of different gears of the second gear set with the second transmission shaft, thereby achieving adjustment of the output speed and adjustment of the plant spacing during planting. There is no need to replace the sprocket, saving time and effort and avoiding affecting the farming season.

[0020] 2. The transmission system of the present invention includes a shifting mechanism comprising a sliding base, a torsion spring, a locking key, and a pressure plate. The locking key can be engaged with different gears in the second gear set simply by moving the sliding base, thereby adjusting the output speed. The operation is convenient, quick, and saves time and effort.

[0021] 3. The transmission system of the present invention is equipped with a clutch and a braking mechanism. When the clutch disconnects the power transmitted to the output shaft, the braking mechanism can lock the output shaft, thereby locking the position of the planting mechanism connected to the output shaft. The planting mechanism will not slide down to the lowest point under its own weight, thus avoiding the impact on transportation and avoiding misalignment with the seedling delivery system. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0024] Figure 2 This is an exploded view of the overall structure of Embodiment 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the first transmission system structure in Embodiment 1 of the present invention;

[0026] Figure 4 This is a schematic diagram of the assembly of the second transmission system and the shifting mechanism in Embodiment 1 of the present invention;

[0027] Figure 5 This is a schematic diagram of the assembly of the sliding base, torsion spring, locking key and clamping plate in Embodiment 1 of the present invention;

[0028] Figure 6 This is a cross-sectional view of the gear shifting mechanism, the second gear set, and the second transmission shaft assembled in Embodiment 1 of the present invention;

[0029] Figure 7 This is a schematic diagram of the clutch structure in Embodiment 1 of the present invention;

[0030] Figure 8 This is a partial sectional view of the clutch structure in Embodiment 1 of the present invention;

[0031] Figure 9 This is an isometric view of the clutch adjusting valve core according to Embodiment 1 of the present invention;

[0032] Figure 10 This is an isometric view of the clutch base in Embodiment 1 of the present invention.

[0033] Figure 11 This is a schematic diagram of the power cutting mechanism in Embodiment 1 of the present invention;

[0034] Figure 12 This is a schematic diagram of the assembly of the limiter and the card block in Embodiment 1 of the present invention;

[0035] Among them, 1. Outer shell, 1-1. First shell part, 1-2. Second shell part, 2. Input shaft, 3. First transmission system, 3-1. First transmission shaft, 3-2. First drive sprocket, 3-3. First driven sprocket, 3-4. First transmission chain, 3-5. First gear set, 3-6. Driven gear, 3-7. Second drive sprocket, 3-8. Second transmission chain, 4. Second transmission system, 4-1. Second transmission shaft, 4-1-1. First keyway, 4-2. Second gear set, 4-2-1. Second keyway, 4-3. Drive gear, 5. Output shaft, 6. Clutch, 6-1. Base, 6-1-1. Slot, 6-1-2. Locking component mounting slot 6-2. Housing, 6-3. Set screw, 6-4. Spring, 6-5. Rear wheel disc, 6-6. Adjusting valve core, 6-7. Locking roller, 6-2-1. Locking part, 6-2-2. Second driven sprocket, 6-6-1. Outwardly convex arc surface, 6-6-2. Flat surface, 7. Gear shifting mechanism, 7-1. Sliding base, 7-2. First connecting arm, 7-3. Central shaft, 7-4. Gear shifting handle, 7-5. Torsion spring, 7-6. Pressure plate, 7-7. Locking key, 7-8. Retaining ring, 8. Power cut-off mechanism, 8-1. Limiting shaft, 8-2. Limiter, 8-3. Locking block, 8-4. Connecting shaft, 8-5. Starter handle, 9. Braking mechanism. Detailed Implementation

[0036] Example 1

[0037] This embodiment provides a planting transmission system that can quickly change speed and lock at a fixed point, including a housing 1. In this embodiment, the housing 1 is composed of a first housing part 1-1 and a second housing part 1-2 that are detachably connected by bolts. The housing 1 has a cavity inside for installing various components.

[0038] like Figure 1-2 As shown, one end of the outer shell 1 serves as the power input end and the other end serves as the power output end. The power input end of the outer shell is provided with an input shaft 2. The input shaft 2 extends into the cavity of the outer shell through a bearing hole opened in the first shell part 1-1. The input shaft 2 is rotatably connected to the first shell part 1-1 through a bearing.

[0039] The input shaft 2 is connected to the output shaft through a power transmission mechanism, which can transmit the input power to the output shaft, thereby driving the output shaft to rotate.

[0040] Along the direction from the power input end to the power output end, the power transmission mechanism includes a first transmission system 3 and a second transmission system 4 arranged sequentially.

[0041] like Figure 3 As shown, the first transmission system 3 includes a first transmission shaft 3-1, one end of which is rotatably connected to the first housing 1-1 via a bearing, and the other end is rotatably connected to the second housing 1-2 via a bearing.

[0042] The end of the first drive shaft 3-1 near the first housing is defined as the first end, and the other end is defined as the second end.

[0043] The first end of the first drive shaft 3-1 is connected to the input shaft 2 through the first drive assembly. The first drive assembly adopts a chain drive mechanism. Specifically, the input shaft is fixedly connected to the first drive sprocket 3-2 by a key, and the first end of the first drive shaft 3-1 is fixedly connected to the first driven sprocket 3-3 by a key. A first drive chain 3-4 is wound between the first drive sprocket 3-2 and the first driven sprocket 3-3. The input shaft 2 can drive the first drive shaft 3-1 to rotate through the chain drive mechanism.

[0044] A first gear set 3-5 is fixed on the first drive shaft 3-1 by a key connection. The first gear set 3-5 includes multiple gears and is used to output different speeds through different transmission ratios.

[0045] In this embodiment, the first gear set 3-5 includes three gears, namely gear A1, gear A2 and gear A3.

[0046] like Figures 4-6 As shown, the second transmission system 4 includes a second transmission shaft 4-1, which is a stepped shaft. One end of the second transmission shaft 4-1 is rotatably connected to the first housing 1-1 through a bearing, and the other end is rotatably connected to the second housing 1-2 through a bearing.

[0047] The middle part of the second drive shaft 4-1 has a gear mounting shaft section with a large diameter. The second gear set 4-2 is rotatably connected to the gear mounting shaft section. The second gear set 4-2 has multiple gears and can rotate freely around the second drive shaft 4-1. In this embodiment, the second gear set 4-2 meshes with the first gear set 3-5 and has three gears: gear B1 meshing with gear A1, gear B2 meshing with gear A2, and gear B3 meshing with gear A3, thereby realizing three different transmission ratios and outputting three different speeds.

[0048] The second end of the second drive shaft 4-1, near the second housing, is connected to the output shaft via the second drive assembly, enabling power to be transmitted to the output shaft.

[0049] In this embodiment, the second transmission component includes a drive gear 4-3 fixed at the second end of the second transmission shaft 4-1. The drive gear 4-3 meshes with a driven gear 3-6 rotatably connected to the first transmission shaft 3-1. A second drive sprocket 3-7 is fixed to the end face of the driven gear 3-6. The second drive sprocket 3-7 is sleeved on the outer circumference of the first transmission shaft 3-1 and rotatably connected to the first transmission shaft 3-1. The second drive sprocket 3-7 is connected to the output shaft 5 through a chain drive mechanism. Specifically, the second drive sprocket 3-7 is connected to the clutch 6 connected to the output shaft 5 through a second transmission chain 3-8.

[0050] In this embodiment, a shifting mechanism 7 is provided between the second gear set 4-2 and the second transmission shaft 4-1. The shifting mechanism 7 can lock and fix different gears in the second gear set 4-2 to the second transmission shaft 4-1 in the circumferential direction, thereby realizing the transmission of the rotation of the corresponding gear in the second gear set to the second transmission shaft.

[0051] In this embodiment, the shifting mechanism 7 includes a sliding base 7-1, which is sleeved on the smaller diameter second transmission shaft 4-1 section on one side of the gear mounting shaft section and is slidably connected to the second transmission shaft 4-1. The sliding base 7-1 can move along the axial direction of the second transmission shaft 4-1.

[0052] In this embodiment, the sliding base 7-1 adopts a disc-shaped structure. A disc-shaped connecting block with a diameter smaller than that of the sliding base is fixedly provided on the end face near the first shell. The connecting block is sleeved on the outer circumference of the second drive shaft and is slidably connected to the second drive shaft 4-1, so that it can move together with the sliding base 7-1.

[0053] The connecting block is rotatably connected to one end of the first connecting arm 7-2 through the annular groove on its outer circumference. The other end of the first connecting arm 7-2 is connected to one end of the central shaft 7-3. The other end of the central shaft 7-3 passes through the limiting hole on the first housing part 1-1 and extends to the outside of the outer housing 1. Its end is connected to the shift handle 7-4.

[0054] The sliding base 7-1 has an opening at its edge, and a pin is installed inside the opening. A torsion spring 7-5 is installed around the pin. The torsion spring 7-5 is connected to one end of the clamping plate 7-6 and the locking key 7-7, causing the clamping plate and the locking key to tend to open. Specifically, the torsion spring is sleeved around the outer periphery of the end of the locking key 7-7 that it connects to and is fixed to the locking key. The pin passes through the end of the locking key 7-7 and is rotatably connected to the locking key 7-7. One end of the torsion spring 7-5 is fixed to the end of the locking key, and the other end is connected to the clamping plate 7-6.

[0055] Both the clamping plate 7-6 and the locking key 7-7 extend into the first keyway 4-1-1 opened in the gear mounting shaft section. The first keyway 4-1-1 adopts a rectangular groove. Under the elastic force of the torsion spring 7-5, the clamping plate 7-6 is always in contact with the bottom groove surface of the first keyway 4-1-1.

[0056] The inner sides of the three gears of the second gear set 4-2 are provided with four equally spaced second keyways 4-2-1. The second keyways 4-2-1 are rectangular slots. A retaining ring 7-8 is provided between two adjacent gears in the second gear set 4-2. The retaining ring 7-8 is sleeved and fixed on the outer periphery of the gear mounting shaft section.

[0057] One end of the locking key 7-7 is connected to the torsion spring 7-5, and the other end is provided with a protrusion, which is a pointed structure.

[0058] In this embodiment, in the initial state, under the elastic force of the clamping plate 7-6 and the torsion spring 7-5, the protrusion of the locking key 7-7 is in the second keyway 4-2-1 of one of the gears in the second gear set 4-2. The user drives the sliding base to move along the axis of the second transmission shaft 4-1 through the shift handle 7-4 and the central shaft 7-3. After the protrusion of the locking key 7-7 contacts the inner edge of the retaining ring 7-8, it swings towards the bottom groove surface of the first keyway 4-1-1 under the action of the retaining ring 7-8 until the protrusion passes the retaining ring 7-8. Then, under the action of the torsion spring 7-5, the protrusion is engaged in the second keyway 4-2-1 of the other gear, so that the gear can drive the second transmission shaft 4-1 to rotate through the locking key 7-7 and the clamping plate 7-6.

[0059] The protrusion engages with the second keyway 4-2-1 of different gears, enabling different gears to drive the second transmission shaft 4-1 to rotate, thereby outputting different transmission ratios.

[0060] In this embodiment, the rotation of the input shaft 2 is transmitted to the first transmission shaft 3-1 through a chain drive mechanism. The three gears of the first gear set 3-5 of the first transmission shaft 3-1 rotate, driving the three gears of the second gear set 4-2 on the second transmission shaft 4-1 to rotate. In the second gear set 4-2, the gear that engages with the protrusion of the locking key 7-7 drives the second transmission shaft 4-1 to rotate. The second transmission shaft 4-1 drives the driven gear 3-6 of the first transmission shaft 3-1 to rotate through the driving gear 4-3. The driven gear 3-6 drives the second driving sprocket 3-7 to rotate. The second driving sprocket 3-7 transmits power to the output shaft 5 through the second transmission chain 3-8 and the clutch 6, driving the output shaft 5 to rotate.

[0061] In this embodiment, different output shaft speeds can be achieved by pushing and pulling the shift handle 7-4, thereby adjusting the plant spacing during planting. This eliminates the need to replace the sprocket, making it convenient, quick, time-saving, and labor-saving, avoiding disruption to planting schedules, and improving the efficiency and quality of mechanized planting.

[0062] The output shaft 5 is connected to the second transmission chain 3-8 via a clutch 6. The clutch 6 can enable and disable the transmission of power to the output shaft.

[0063] like Figures 7-9As shown, in this embodiment, the clutch 6 includes a base 6-1, a housing 6-2, a set screw 6-3, a spring 6-4, a rear wheel 6-5, an adjusting valve core 6-6, and a locking element. The locking element uses locking rollers 6-7. The outer circumferential surface of the base 6-1 is provided with a groove 6-1-1, and the end face of the base near the second housing is provided with a mounting ring. The mounting ring has multiple locking element mounting grooves 6-1-2. One side of the base has a mounting ring, and the other side has a rear wheel 6-5. The rear wheel has a connecting section that inserts into the base. The connecting section is rotatably connected to the base 6-1 via a bearing. The outer circumferential surface of the rear wheel is set to the base 6-1 via the spring 6-4. The specific spring 6-4 is fixed at one end to the screw 6-3 fixed on the circumference of the rear wheel 6-5, and at the other end to the set position of the base 6-1; the adjusting valve core 6-6 is concentrically installed with the base 6-1 and set inside the mounting ring; the locking roller 6-7 is installed in the slot 6-1-2; the housing 6-2 includes a locking part 6-2-1, which is sleeved on the outer circumference of the mounting ring, and a second driven sprocket 6-2-2 is set at the outer end of the locking part. The housing 6-2 is set on the other side of the base 6-1, and the inner surface of the locking part 6-2-1 cooperates with the locking roller 6-7. The second driven sprocket 6-2-2 is connected to the second transmission chain 3-8.

[0064] The adjusting valve core 6-6 and the rear wheel disc 6-5 are both fixedly connected to the output shaft via splines. Both sides of the clutch are equipped with retaining rings mounted on the output shaft to limit the clutch's movement along the output shaft axis. One retaining ring is fitted to the end of the housing, and the other retaining ring is fitted to the rear wheel disc. Axial positioning of the housing is achieved through the retaining rings and the base. The housing is also rotatably connected to the output shaft via bearings, achieving radial positioning of the housing using the output shaft and bearings.

[0065] The outer peripheral surface of the adjusting valve core 6-6 that contacts the locking roller 6-7 includes alternately arranged flat surfaces 6-6-2 and convex arc surfaces 6-6-1. When the convex arc surface 6-6-1 contacts the locking roller 6-7, the locking roller 6-7 can move radially outward along the adjusting valve core, thereby pressing the locking roller 6-7 against the inner side of the locking part 6-2-1 of the housing 6-2. Thus, the movement of the housing 6-2 is transmitted to the adjusting valve core 6-6 by friction. The center of the adjusting core 6-6 is connected to the output shaft through a spline, thereby driving the rotation of the output shaft. At the same time, the output shaft drives the base 6-1 to rotate synchronously through the rear wheel 6-5 and the spring.

[0066] When the plane 6-6-2 of the adjusting valve core 6-6 contacts the locking roller 6-7, the locking roller 6-7 falls radially back towards the valve core, and the locking roller 6-7 disengages from the inner side of the housing 6-3, releasing the locking state with the housing 6-2. At this time, the housing 6-2 rotates freely and does not transmit power to the adjusting valve core. The adjusting valve core, rear wheel, base and output shaft do not rotate.

[0067] A slot 6-1-1 is provided on the outer peripheral surface of the base 6-1, and a power cutting mechanism 8 is provided on the first shell 1-1, such as... Figures 10-11 As shown, the power cutting mechanism 8 includes a limiting shaft 8-1. One end of the limiting shaft 8-1 is fixed to the first housing 1-1, and the other end is fixed to the second housing 1-2. A limiter 8-2 is slidably connected on the limiting shaft 8-1. The limiter 8-2 has a cylindrical structure and is sleeved on the outer circumference of the limiting shaft 8-1, and can move along the axial direction of the limiting shaft 8-1.

[0068] The outer circumferential surface of the limiter 8-2 is provided with a locking block 8-3 that cooperates with the locking slot, and the locking block 8-3 adopts an arc-shaped structure.

[0069] The limiter 8-2 has an annular groove at the end near the first housing and is fixed to one end of the second connecting arm through the annular groove. The other end of the second connecting arm is fixed to one end of the connecting shaft 8-4. The other end of the connecting shaft 8-4 passes through the first housing 1-1 and extends to the outside of the first housing 1-1. The end of the connecting shaft 8-4 extending to the outside of the first housing is connected to a start handle 8-5.

[0070] In this embodiment, the start handle 8-5 drives the limiter 8-2 to move along the limit axis, causing the locking block 8-3 to engage in the slot 6-1-1. At this time, the base 6-1 cannot rotate. Under the action of the spring 6-4, the rear wheel 6-5 is prevented from rotating, which in turn prevents the output shaft from rotating, further preventing the adjustment valve core 6-6 from rotating. This causes the adjustment valve core 6-6 to rotate relative to the housing 6-2, changing the state of the adjustment valve core 6-6 from contacting the convex arc surface with the locking roller 6-7 to contacting the plane with the locking roller 6-7, thus achieving the cut-off of power.

[0071] When the moving limiter 8-2 causes the locking block 8-3 to disengage from the slot 6-1-1, the core and the base are reset under the action of the spring 6-4, and the outer convex arc surface of the core contacts the locking element, restoring the power transmission state.

[0072] The outer side of the first housing is also provided with a brake mechanism 9 that cooperates with the output shaft. The brake mechanism 9 can adopt the seedling calibration device described in patent CN202120980492.0, including a fixing member, a fixing member hinged pipe fitting, the pipe fitting can rotate, the pipe fitting is connected to a rod, and the pipe fitting is also provided with a protrusion; the outer edge has a protruding brake pad, the outer edge of the brake pad abuts against the end of the rod, thereby driving the pipe fitting to rotate; a linkage mechanism, the front end of which passes through the protrusion located in the pipe fitting, and an elastic element is installed between the front end of the linkage mechanism and the protrusion of the pipe fitting for resetting the linkage mechanism and keeping the outer edge of the brake pad abutting against the end of the rod; a brake pad, connected to the end of the linkage mechanism, the brake pad can abut against the brake pad, and its specific structure will not be described in detail here.

[0073] In this embodiment, when the power is cut off by the clutch 6, the output shaft 5 is locked by the brake mechanism 9, thereby locking the position of the planting mechanism connected to the output shaft 5. The planting mechanism will not slide down to the lowest point under its own gravity, thus avoiding the impact on transportation and avoiding misalignment with the seedling delivery system.

[0074] When the locking block 8-3 disengages from the slot 6-9 and the brake mechanism 9 releases its locking state on the output shaft 5, the adjusting valve core 6-6 and the base 6-1 are reset under the action of the spring 6-4, and the outer convex arc surface of the adjusting valve core 6-6 contacts the locking roller 6-7, restoring the power transmission state.

[0075] Example 2

[0076] This embodiment provides a planting device equipped with a planting transmission system as described in Embodiment 1, which enables quick speed change and fixed-point locking. Other structures of the planting device can adopt existing structures, and their specific structures will not be described in detail here.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A planting transmission system capable of rapid speed change and fixed-point locking, comprising an input shaft, the input shaft being connected to an output shaft via a power transmission mechanism, characterized in that, The power transmission mechanism includes a first transmission system and a second transmission system. The first transmission system includes a first transmission shaft rotatably connected to the housing. The first transmission shaft is connected to the input shaft through a first transmission assembly. A first gear set is fixed on the first transmission shaft. The second transmission system includes a second transmission shaft rotatably connected to the housing. The second transmission shaft is provided with a second gear set that meshes with the first gear set. A shifting mechanism is provided between the second gear set and the second transmission shaft to realize the switching between the locking and contact locking states of different gears of the second gear set with the second transmission shaft. The second transmission shaft is connected to the output shaft through a second transmission assembly. The power output end of the second transmission assembly is connected to the output shaft through a clutch. The clutch includes a limiting shaft, which is parallel to the output shaft and fixed to the housing. The limiting shaft is slidably connected to a limiter. The limiter has a locking block that engages with a slot in the base. The base has a housing on one side and a rear wheel on the other side. The rear wheel is rotatably connected to the base. An elastic element is provided between the rear wheel and the base. The housing is connected to the second transmission assembly. An adjusting valve core is provided inside the housing. A locking element is provided between the adjusting valve core and the housing. Both the adjusting valve core and the rear wheel are fixedly connected to the output shaft. The adjusting valve core is fitted with a mounting ring that is fixed to the base. The housing is fitted around the mounting ring. The locking element is installed in the locking element mounting groove opened in the mounting ring. The surface of the adjusting valve core that contacts the locking element is an alternating plane and an outwardly convex arc surface.

2. The planting transmission system with rapid speed change and fixed-point locking as described in claim 1, characterized in that, The shifting mechanism includes a sliding base, which is slidably connected to the second transmission shaft. A pin is provided in the opening at the edge of the sliding base, and a torsion spring is provided on the outer periphery of the pin. The torsion spring is connected to a locking key and a clamping plate. The locking key and the clamping plate extend into the first keyway opened in the second transmission shaft. The clamping plate presses against the bottom surface of the first keyway under the elastic force of the torsion spring. The end of the locking key is provided with a protrusion, which can be engaged into the second keyway of each gear of the second gear set under the elastic force of the torsion spring. Furthermore, a retaining ring is provided between adjacent gears of the second gear set, and the retaining ring is sleeved and fixed to the outer circumference of the second transmission shaft.

3. A planting transmission system capable of rapid speed change and fixed-point locking as described in claim 2, characterized in that, The sliding base is rotatably connected to one end of the first connecting arm, and the other end of the first connecting arm is provided with a central shaft, which extends out of the outer shell and is connected to a gear shift handle.

4. A planting transmission system capable of rapid speed change and fixed-point locking as described in claim 1, characterized in that, The first transmission component adopts a chain drive mechanism.

5. A planting transmission system capable of rapid speed change and fixed-point locking as described in claim 1, characterized in that, The second transmission assembly includes a drive gear fixed to a second transmission shaft. The drive gear meshes with a driven gear rotatably connected to a first transmission shaft. A second drive sprocket is fixed to the driven gear. The second drive sprocket is rotatably connected to the first transmission shaft and is connected to an output shaft via a chain drive mechanism.

6. A planting transmission system capable of rapid speed change and fixed-point locking as described in claim 1, characterized in that, The power output end of the second transmission component is connected to the output shaft via a clutch, and the housing is also equipped with a braking mechanism that cooperates with the output shaft.

7. A planting transmission system capable of rapid speed change and fixed-point locking as described in claim 1, characterized in that, The limiter adopts a cylindrical structure sleeved on the outer circumference of the limit shaft. One end of the limiter is connected to one end of the second connecting arm, and the other end of the second connecting arm is connected to the start handle that extends out of the outer shell.

8. A planting device, characterized in that, The planting transmission system described in any one of claims 1-7 is provided, which enables rapid speed change and fixed-point locking.

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