Adjustable rice transplanter steering structure

Abstract

The application discloses a steering structure of adjustable rice transplanter, and belongs to the technical field of the transplanter.The steering structure of the adjustable rice transplanter comprises a transplanter frame and a front transplanter cabin located at the top front end of the transplanter frame, the bottom front end of the transplanter frame is provided with an annular mounting plate, and the bottom front end area of the annular mounting plate along the advancing direction of the transplanter frame is provided with a wheel track adjusting mechanism for adjusting the distance between the two front wheels.The orderly switching of the front wheel self-steering and the overall steering can greatly optimize the field head steering operation efficiency.When the rice transplanter drives to the field head and needs to be steered, the first steering mechanism drives the front wheel to rotate around the hinge shaft as the axis, preliminary steering adjustment is realized, when the steering wheel is rotated to 45 DEG, the seamless switching from the "front wheel self-steering with a small angle" to the "overall steering of the front wheel with a large angle" is realized through the cooperation of the ellipsoid and the limiting component, and the technical pain point of the complicated switching of the steering mode of the traditional equipment is solved.

Description

Technical Field

[0001] This invention belongs to the field of rice transplanter technology, specifically relating to a steering structure for an adjustable rice transplanter. Background Technology

[0002] Rice transplanters mainly consist of a traction unit at the front and a transplanting unit at the rear. The traction unit and the transplanting unit are hinged together. The transplanting unit has a fixed seat and is equipped with a transplanting device. The traction unit has a fixed operating handle and is equipped with an engine. As a core agricultural machinery equipment for paddy field planting, the steering performance of rice transplanters directly affects field operation efficiency, transplanting quality, and equipment adaptability.

[0003] Traditional rice transplanters typically have a fixed front wheel track, making it impossible to flexibly adjust to the row spacing requirements of different regions and rice varieties. Given the significant differences in paddy field specifications between northern and southern my country, and the existence of different row spacing patterns within the same region, fixed-track transplanters are extremely limited in adapting to various planting patterns, significantly reducing the versatility of agricultural machinery. Secondly, existing rice transplanters have a limited steering mode, often employing either front wheel self-steering or overall steering. This makes it difficult to balance steering efficiency with operational applicability, and the steering operation is complex, requiring operators to frequently switch control components, resulting in high labor intensity. Furthermore, the two steering modes cannot be switched in an orderly manner, leading to poor continuity of field steering operations and significantly reducing overall field efficiency. Simultaneously, the steering drive and limiting structures of traditional transplanters suffer from low steering accuracy and poor stability. Most transplanters use a single transmission structure to transmit steering power, lacking a self-locking function. When operating in muddy paddy fields, load fluctuations can easily cause steering deviation, affecting the uniformity of the transplanting row spacing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a steering structure for an adjustable rice transplanter.

[0005] The technical solution adopted to solve the above-mentioned technical problems is: an adjustable rice transplanter steering structure, including a transplanter frame and a front-mounted machine compartment located at the front end of the top of the transplanter frame. An annular mounting plate is provided at the front end of the bottom of the transplanter frame. A wheel track adjustment mechanism for adjusting the distance between the two front wheels is provided at the front area of ​​the bottom of the annular mounting plate along the forward direction of the transplanter frame. A first steering mechanism for driving the two front wheels to turn themselves is provided at the bottom of the annular mounting plate. A second steering mechanism for driving the two front wheels to turn as a whole is provided at the bottom of the annular mounting plate. A manual drive mechanism is provided inside the front-mounted machine compartment. The manual drive mechanism provides driving force for the first steering mechanism and the second steering mechanism.

[0006] Furthermore, the wheel track adjustment mechanism includes two sets of square inserts, which are symmetrically hinged to the bottom of the annular mounting plate near the front end of the rice transplanter frame. Square rods are symmetrically inserted into the inner bottom of each set of square inserts. The bottom ends of the square rods are hinged to front wheel connecting frames via hinge components. The sides of the two sets of front wheel connecting frames that are far apart from each other are rotatably connected to the axle positions of the two sets of front wheels via first bearings. A connecting component is shared at the bottom of the sides of the two sets of square rods that are close to each other. Hydraulic cylinders are symmetrically hinged to the bottom of the annular mounting plate. The output ends of the two sets of hydraulic cylinders are respectively hinged to the bottom of the outer side of an adjacent set of square inserts. The connecting component includes a connecting seat, and two sets of connecting seats are provided, and the two sets of connecting seats are symmetrically installed on the bottom of the outer side of the two sets of square inserts. A U-shaped frame is installed at the middle position of the bottom of the annular mounting plate. A square slide rod is installed on the bottom of both sides of the U-shaped frame. A slidable first square collar is sleeved on the outer side of the square slide rod, and a first connecting rod is symmetrically hinged on both sides of the first square collar. The end of the first connecting rod away from the first square collar is hinged to the outer side of an adjacent set of connecting seats.

[0007] Through the above technical solution, when the two sets of hydraulic cylinders extend and retract, they push the corresponding square insertion rods to swing around the hinge point between the square insertion tube and the annular mounting plate and extend and retract axially along the inner cavity of the square insertion tube. The square insertion rods drive the bottom connecting seat to move synchronously. The connecting seat pulls the first square collar along the square slide bar on the U-shaped frame through the first connecting rod, so that the two sets of square insertion rods move closer or further away synchronously. Finally, the front wheel connecting frame drives the two front wheels to adjust the distance, so as to achieve stable and precise adjustment of the distance between the two front wheels. This adapts to the diverse planting patterns with different planting row spacings and the different specifications of paddy fields in the north and south, greatly improving the versatility of the equipment.

[0008] Furthermore, the hinge component includes a mounting groove, which is formed at the bottom of the square insert near the front wheel connecting bracket. A hinge bracket is mounted on the side of the front wheel connecting bracket near the square insert. The bottom end of the square insert is rotatably connected to the hinge bracket via a hinge shaft. The hinge bracket is located inside the mounting groove. A shock-absorbing spring is sleeved on the outside of the hinge shaft, and the top end of the shock-absorbing spring contacts the inner top of the mounting groove. The bottom end of the shock-absorbing spring contacts the inner bottom of the hinge bracket.

[0009] Through the above technical solution, the hinge component provides a rotatable and buffered connection point between the square plug and the front wheel connecting frame. The hinge frame is rotatably connected to the bottom end of the square plug through the hinge shaft, so that the front wheel connecting frame can rotate around the hinge shaft, providing a basis for the front wheel to turn itself. The two ends of the shock-absorbing spring on the outside of the hinge shaft abut against the top of the mounting groove and the bottom of the hinge frame, respectively, which can buffer the impact of paddy field bumps on the connection part and absorb vibration energy.

[0010] Furthermore, the first steering mechanism includes a second bearing located at the front end of the bottom of the rice transplanter frame. The center of the second bearing coincides with the center of the annular mounting plate. The inner ring of the second bearing is provided with a transmission component for power transmission. The outer side of the square slide rod is provided with a steering component for pulling the two front wheels to rotate around the hinge axis. The transmission component provides driving force for the steering component.

[0011] Through the above technical solution, the second bearing coincides with the center of the annular mounting plate, providing stable rotational support for the transmission components. After receiving power from the manual drive mechanism, the transmission components transmit it to the steering components sleeved on the outside of the square slide rod, driving the steering components to move along the square slide rod, thereby pulling the front wheels to achieve self-steering around the hinge shaft. Sharing the square slide rod with the wheel track adjustment mechanism simplifies the structural linkage path, thereby realizing the small-angle self-steering function of the front wheels, adapting to the fine-tuning needs when driving straight in the field, and making up for the lack of flexibility of the traditional single steering mode. The positioning of the second bearing ensures the concentricity of the rotation of the transmission components, avoids power transmission deviation, and lays the foundation for steering accuracy. Sharing the carrier with the wheel track adjustment mechanism reduces structural redundancy and lowers equipment manufacturing costs.

[0012] Furthermore, the transmission component includes a first rotating shaft fixedly connected to the inner ring of the second bearing, a first bevel gear mounted on the bottom of the outer side of the first rotating shaft, a rotatable second rotating shaft located at the middle position inside the U-shaped frame, a second bevel gear meshing with the first bevel gear mounted on one end of the outer side of the second rotating shaft, and a wide gear mounted on the other end of the outer side of the second rotating shaft.

[0013] Through the above technical solution, the first rotating shaft is fixed to the inner ring of the second bearing. After receiving power from the manual drive mechanism, it drives the first bevel gear to rotate. The first bevel gear meshes with the second bevel gear to realize the vertical reversal of power, driving the second rotating shaft to rotate. The wide gear at the other end of the second rotating shaft rotates synchronously, transmitting power to the steering component and completing the conversion of "longitudinal power - lateral power". The wide gear increases the meshing area with the steering component, improves the stability and load-bearing capacity of power transmission, prevents gear slippage caused by fluctuations in paddy field load, and also ensures that the rack can always be meshed with the wide gear when adjusting the distance between the two sets of front wheels.

[0014] Furthermore, the steering component includes a second square collar sleeved on the outside of the square slide rod. The cross-sectional width of the inner cavity of the second square collar is greater than the cross-sectional width of the square slide rod. Second connecting rods are symmetrically hinged to both sides of the second square collar. The end of the second connecting rod away from the second square collar is hinged to the outer end of an adjacent set of front wheel connecting frames. A straight rack that meshes with a wide gear is provided at the bottom of the second square collar. First sliding grooves are symmetrically opened at the inner top and inner bottom of the second square collar. First sliders are symmetrically arranged inside the two sets of first sliding grooves. A limit slider is installed between the two sets of first sliders. The square slide rod is provided with a limit sliding groove that matches the limit slider.

[0015] Through the above technical solution, the wide gear meshes with the straight rack at the bottom of the second square collar, driving the second square collar to move laterally along the square slide bar. The second square collar pulls the front wheel connecting frame through the second connecting rods on both sides, causing the front wheel to rotate around the hinge axis. The first slider slides in the first slide groove. With the guidance of the limit slider and the limit slide groove, the movement of the second square collar is ensured to be smooth and without deviation, thereby realizing the precise conversion of rotational power to linear power. This ensures that the steering angle of the two front wheels is uniform and consistent, avoiding over-steering on one side and causing the equipment to deviate. The dual guidance of the slider and the limit structure prevents the second square collar from jamming or shaking when moving, improving steering smoothness and adapting to positional changes after wheel track adjustment. The limit slider can slide along the limit slide groove to ensure that the steering function still works normally after wheel track adjustment, realizing the coordinated adaptation of wheel track adjustment and steering.

[0016] Furthermore, the second steering mechanism includes a third bearing, the inner ring of which is fixedly connected to the outer ring of the annular mounting plate, and the outer ring of which is fixedly connected to the bottom of the rice transplanter frame. An ellipse is installed at the bottom of the outer side of the first rotating shaft, and the ellipse is located above the first bevel gear. Active levers are symmetrically installed at the two ends of the short axis of the outer side of the ellipse. A limiting component for restricting the rotation of the annular mounting plate is provided at the bottom of the rice transplanter frame near the annular mounting plate. Four sets of driven levers that cooperate with the active levers are evenly installed on the inner ring of the annular mounting plate. A rotary linkage component that cooperates with the active levers is provided at the inner ring of the top of the annular mounting plate.

[0017] Through the above technical solution, the third bearing connects the annular mounting plate to the rice transplanter frame, providing support for the overall rotation of the annular mounting plate. The ellipse rotates synchronously with the first rotating shaft, and the active lever at the end of its short axis changes with the posture of the ellipse. After the limiting component is unlocked, the active lever abuts against the driven lever on the inner ring of the third bearing, driving the annular mounting plate and the front wheel to rotate around the first rotating shaft. The rotation linkage component cooperates with the active lever to ensure accurate return to center after turning, realizing the dual-mode switching of "front wheel self-steering - overall steering". When turning at the field, it switches to the overall steering mode, which greatly reduces the turning radius and avoids crushing the transplanted seedlings, solving the pain point of the traditional excessively large turning radius. The third bearing ensures smooth rotation of the annular mounting plate and reduces friction loss. The cooperation between the active lever and the driven lever makes the overall steering power transmission direct, improves steering efficiency, and reduces the labor intensity of the operator.

[0018] Furthermore, the limiting component includes a slot, and two sets of slots are provided, with the two sets of slots symmetrically located on the inner ring of the annular mounting plate. The bottom of the rice transplanter frame is symmetrically provided with a second sliding groove centered on the first rotating shaft. A second slider is provided inside the second sliding groove. A reset spring fixedly connected to the second slider is installed at one end of the second sliding groove near the first rotating shaft. A roller that cooperates with an ellipse is provided at one end of the top of the second slider near the reset spring. A locking block that cooperates with the slot is installed at the other end of the second slider. Four sets of driven blocks are symmetrically distributed with the straight line where the two sets of slots are located as the axis.

[0019] With the above technical solution, when the rice transplanter is traveling in a straight line, the protruding part of the ellipse pushes the roller at the top of the second slider, causing the second slider to stretch the reset spring and move, thereby causing the locking block to engage with the slot of the annular mounting plate, restricting the rotation of the annular mounting plate. When turning, the ellipse rotates, and the roller gradually moves away from the protruding part of the ellipse. At this time, the reset spring pulls the second slider and moves, and the locking block follows the second slider to disengage from the slot, unlocking the annular mounting plate. The four sets of driven levers are symmetrically distributed and trigger unlocking according to the turning angle of the ellipse.

[0020] Furthermore, the rotary linkage component includes a storage groove, and two sets of storage grooves are provided, symmetrically opened on the inner ring of the annular mounting plate. The storage groove is located near the driven lever on the inner ring of the annular mounting plate. A telescopic lever that cooperates with the active lever is inserted inside the storage groove. Two sets of strip-shaped through holes communicating with the inside of the storage groove are symmetrically opened on the top of the annular mounting plate. A connecting post passing through the strip-shaped through hole is installed at the top end of the telescopic lever near the outer ring of the annular mounting plate. The bottom of the rice transplanter frame is symmetrically opened with the center of the annular mounting plate as the center. The ends of the first and second arc-shaped grooves that are close to each other are connected by a connecting groove. The diameter of the circle containing the first arc-shaped groove is larger than the diameter of the circle containing the second arc-shaped groove, so as to realize the gradual extension and retraction of the telescopic lever during the rotation of the annular mounting plate.

[0021] With the above technical solution, when the two sets of front wheels turn as a whole, the connecting column rotates with the annular mounting plate, slides along the first arc-shaped groove and enters the second arc-shaped groove through the connecting groove, driving the telescopic block to extend from the storage groove, and together with the driven block, limits the active block. When rotating, the active block abuts against the telescopic block, driving the annular mounting plate to rotate in the opposite direction. When the connecting column returns to the first arc-shaped groove, the telescopic block retracts into the storage groove, releasing the limit. At this time, the annular mounting plate has returned to the center and will no longer rotate.

[0022] Furthermore, the manual drive mechanism includes a steering wheel located at the center of the top of the front engine compartment. A coupling is installed at the bottom of the steering wheel shaft, and a worm gear is installed at the end of the coupling away from the steering wheel. The top of the outer side of the first rotating shaft extends into the interior of the front engine compartment and is equipped with a driven gear. A third rotating shaft is located at the center of the interior of the front engine compartment, and a driving gear that meshes with the driven gear is installed at the bottom of the outer side of the third rotating shaft. A worm wheel that meshes with the worm gear is installed at the top of the outer side of the third rotating shaft.

[0023] With the above technical solution, the operator turns the steering wheel, and its shaft drives the worm gear to rotate through the coupling. The worm gear meshes with the worm wheel to achieve power deceleration and reversal, driving the third rotating shaft to rotate. The third rotating shaft meshes with the driven gear through the driving gear to drive the first rotating shaft to rotate, thereby transmitting power to the first steering mechanism and the second steering mechanism. The worm gear transmission has a self-locking function, which can prevent steering deviation caused by fluctuations in paddy field load, ensure steering accuracy, and solve the defects of traditional single transmission without self-locking function.

[0024] The beneficial effects of the present invention are as follows: (1) The present invention can flexibly adjust the distance between the two front wheels through the wheel spacing adjustment mechanism to adapt to the rice planting needs of different row spacing specifications, solving the problem that the front wheel spacing of the traditional rice transplanter is fixed and cannot adapt to the diverse planting modes. During the adjustment process, the hydraulic cylinder drives the square insertion rod to extend and retract along the square insertion tube. With the linkage of the connecting parts, the front wheel spacing is adjusted smoothly, which improves the versatility of the rice transplanter in different specifications of paddy fields and complex fields; (2) The present invention realizes the orderly switching between the front wheel self-steering and the overall steering through the linkage structure of the first steering mechanism and the second steering mechanism, which greatly optimizes the efficiency of field turning operations. When the rice transplanter needs to turn when it reaches the field, the first steering mechanism drives the front wheel to rotate around the hinge shaft as the axis to realize the initial steering adjustment. When the steering wheel is turned to 45°, the ellipse, the active shift block and the driven shift block are used to cut the steering wheel. The second steering mechanism drives the ring mounting plate and the front wheel to rotate as a whole, which significantly reduces the turning radius and avoids crushing the planted seedlings during the turning process. Through the cooperation of the ellipse and the limiting component, the seamless switching from "small angle turning of the front wheel itself" to "large angle turning of the front wheel as a whole" is realized. The trigger condition is clear (45° rotation of the steering wheel), and no additional switching of the control component is required by the operator, which solves the technical pain point of the cumbersome switching of the steering mode of traditional equipment; (3) The drive mechanism of the present invention adopts a multi-stage transmission structure of worm gear and worm and bevel gear set, which has both power transmission accuracy and self-locking function, avoids steering deviation caused by load during the turning process, and ensures the accuracy of steering operation. At the same time, the steering component is driven by the meshing of the straight rack and wide gear, and the sliding guide of the first slider in the first slide groove realizes the smooth lateral movement of the second square collar, ensuring that the front wheel steering angle is uniform. Attached Figure Description

[0025] Figure 1 This is a first-view structural diagram of the present invention on a rice transplanter;

[0026] Figure 2 This is a second-view structural diagram of the present invention on a rice transplanter;

[0027] Figure 3 This is a first-view structural diagram of the present invention;

[0028] Figure 4 This is a second-view structural diagram of the present invention;

[0029] Figure 5 This is a schematic diagram showing the disassembled parts of the present invention;

[0030] Figure 6 This is a schematic diagram of the wheel track adjustment mechanism of the present invention;

[0031] Figure 7 This is a partial structural schematic diagram of the wheel track adjustment mechanism of the present invention;

[0032] Figure 8 This is a schematic diagram of the U-shaped frame of the present invention;

[0033] Figure 9 This is a first-view structural diagram of the steering component of the present invention;

[0034] Figure 10 This is a second-view structural diagram of the steering component of the present invention;

[0035] Figure 11 This is a schematic diagram of the connection between the first rotating shaft and the first bevel gear in this invention;

[0036] Figure 12 This is a first-view structural diagram of the first and second arc-shaped grooves of the present invention;

[0037] Figure 13 This is a second-view structural diagram of the first and second arc-shaped grooves of the present invention;

[0038] Figure 14 This is a schematic diagram of the structure of the second steering mechanism of the present invention;

[0039] Figure 15 This is a schematic diagram of the second steering mechanism of the present invention separated from the rice transplanter frame;

[0040] Figure 16 This is a schematic diagram of the structure of the annular mounting plate of the present invention;

[0041] Figure 17 This is the present invention. Figure 6 A magnified view of a section at point A in the middle;

[0042] Figure 18 This is the present invention. Figure 14 A magnified view of a section at point B in the middle;

[0043] Figure 19 This is the present invention. Figure 16 A magnified view of a section at point C.

[0044] Reference numerals: 1. Rice transplanter frame; 2. Wheelbase adjustment mechanism; 201. Square inserting tube; 202. Square inserting rod; 203. Front wheel connecting frame; 204. Hinge component; 2041. Mounting groove; 2042. Shock-absorbing spring; 2043. Hinge shaft; 2044. Hinge frame; 205. First bearing; 206. Connecting component; 2061. U-shaped frame; 2062. Square slide rod; 2063. Connecting seat; 2064. First square... 2065. Collar; 2066. First connecting rod; 207. Hydraulic cylinder; 3. First steering mechanism; 301. Transmission component; 3011. First rotating shaft; 3012. First bevel gear; 3013. Second rotating shaft; 3014. Second bevel gear; 3015. Wide gear; 302. Steering component; 3021. Second square collar; 3022. Second connecting rod; 3023. Straight rack; 3024. First slide groove; 3025. First slider; 3026, limiting slider; 3027, limiting groove; 303, second bearing; 4, second steering mechanism; 401, elliptic body; 402, active lever; 403, limiting component; 4031, second groove; 4032, second slider; 4033, roller; 4034, locking block; 4035, locking groove; 4036, return spring; 404, third bearing; 405, driven lever; 406, rotary linkage component ; 4061, Storage slot; 4062, Telescopic lever; 4063, Strip-shaped through hole; 4064, Connecting column; 4065, First arc-shaped groove; 4066, Connecting groove; 4067, Second arc-shaped groove; 5, Manual drive mechanism; 501, Steering wheel; 502, Driven gear; 503, Third rotating shaft; 504, Driving gear; 505, Worm gear; 506, Coupling; 507, Worm; 6, Front engine compartment; 7, Annular mounting plate. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0046] like Figures 1-4 , Figures 6-8 and Figure 17As shown, the steering structure of an adjustable rice transplanter in this embodiment includes a transplanter frame 1 and a front-mounted machine compartment 6 located at the top front end of the transplanter frame 1. An annular mounting plate 7 is provided at the front end of the bottom of the transplanter frame 1. A wheel track adjustment mechanism 2 for adjusting the distance between the two front wheels is provided at the bottom of the annular mounting plate 7 along the front area of ​​the transplanter frame 1 in the forward direction. The wheel track adjustment mechanism 2 includes a square insertion tube 201, which serves as a sliding guide for a square insertion rod 202. The square structure prevents the square insertion rod 202 from rotating, ensuring the stability of the front wheel posture during adjustment. Two sets of square insertion tubes 201 are provided, and the two sets of square insertion tubes 201 are symmetrically hinged on both sides of the bottom of the annular mounting plate 7 near the front end of the transplanter frame 1. Two sets of square insertion tubes 201 are symmetrically inserted with square insertion rods 202 at their inner bottoms. The bottom ends of the square insertion rods 202 are hinged to front wheel connecting brackets 203 via hinge components 204. The two sets of front wheel connecting brackets 203 are rotatably connected to the axle positions of the two sets of front wheels via first bearings 205 on their respective sides. This is used to connect the square insertion rods 202 to the front wheels and also to ensure that wheelbase adjustment and steering actions do not interfere with each other. The bottom of the two sets of square insertion rods 202 on their respective sides are provided with connecting components 206. Hydraulic cylinders 207 are symmetrically hinged to the bottom of the annular mounting plate 7. The output ends of the two sets of hydraulic cylinders 207 are respectively hinged to the bottom of the outer side of the adjacent set of square insertion rods 202. The hydraulic cylinders 207 directly drive the square insertion rods 202 along the square insertion tubes. The hinge joint 201 allows for sliding, and the angle of the square insert 202 can be adjusted to avoid stress concentration during power transmission. The connecting component 206 includes a connecting seat 2063, of which two sets are provided and symmetrically installed on the bottom of the outer sides of the two sets of square inserts 202. A U-shaped frame 2061 is installed at the middle position of the bottom of the annular mounting plate 7. A square slide rod 2062 is installed on the bottom of both sides of the U-shaped frame 2061. A slidable first square collar 2064 is sleeved on the outer side of the square slide rod 2062, and a first connecting rod 2065 is symmetrically hinged on both sides of the first square collar 2064. The end of the first connecting rod 2065 away from the first square collar 2064 is connected to an adjacent set of connecting seats 2062. The outer hinge of 063 includes a mounting groove 2041, which is located at the bottom of the square insert 202 near the front wheel connecting bracket 203. A hinge bracket 2044 is mounted on the side of the front wheel connecting bracket 203 near the square insert 202. The bottom end of the square insert 202 is rotatably connected to the hinge bracket 2044 via a hinge shaft 2043. The hinge bracket 2044 is located inside the mounting groove 2041. A shock-absorbing spring 2042 is sleeved on the outer side of the hinge shaft 2043, with its top end contacting the inner top of the mounting groove 2041 and its bottom end contacting the inner bottom of the hinge bracket 2044. When the square insert 202 moves, it drives the bottom connecting seat 2063 to move synchronously.The connecting seat 2063 pulls the first square collar 2064 along the square slide bar 2062 on the U-shaped frame 2061 via the first connecting rod 2065, causing the two sets of square insert rods 202 to move closer or further apart synchronously. Ultimately, the front wheel connecting frame 203 drives the two front wheels to adjust their distance. The hinge component 204 provides a rotatable buffer connection between the square insert rods 202 and the front wheel connecting frame 203. The hinge frame 2044 is rotatably connected to the square insert rods 202 via the hinge shaft 2043, reserving space for subsequent front wheel steering. The shock-absorbing springs 2042 on the outside of the hinge shaft 2043 abut against the mounting groove 2041 and the hinge frame 2044 respectively, absorbing the vibration and impact caused by the paddy field's turbulence.

[0047] like Figures 1-5 , Figures 8-12 and Figure 18As shown, in this embodiment, the bottom of the annular mounting plate 7 is provided with a first steering mechanism 3 that drives the two front wheels to steer themselves. The first steering mechanism 3 includes a second bearing 303, which is located at the front end of the bottom of the rice transplanter frame 1. The center of the second bearing 303 coincides with the center of the annular mounting plate 7. The inner ring of the second bearing 303 is provided with a transmission component 301 for power transmission. The outer side of the square slide rod 2062 is provided with a steering component 302 for pulling the two front wheels to rotate around the hinge shaft 2043. The transmission component 301 provides driving force to the steering component 302. The transmission component 301 includes a first rotating shaft 3011 fixedly connected to the inner ring of the second bearing 303. A first bevel gear 3012 is installed at the bottom of the outer side. A rotatable second rotating shaft 3013 is provided at the middle position inside the U-shaped frame 2061. A second bevel gear 3014 that meshes with the first bevel gear 3012 is installed at one end of the outer side of the second rotating shaft 3013. A wide gear 3015 is installed at the other end of the outer side of the second rotating shaft 3013. The steering component 302 includes a second square collar 3021 sleeved on the outer side of the square slide rod 2062. The cross-sectional width of the inner cavity of the second square collar 3021 is larger than the cross-sectional width of the square slide rod 2062. Second connecting rods 3022 are symmetrically hinged to both sides of the second square collar 3021. The second connecting rods 3022 are away from the second square collar 302. One end of the first square collar 3021 is hinged to the outer end of the adjacent front wheel connecting bracket 203. A spur rack 3023 meshes with the wide gear 3015 at the bottom of the second square collar 3021. First grooves 3024 are symmetrically provided on the inner top and bottom of the second square collar 3021. First sliders 3025 are symmetrically arranged inside the two sets of first grooves 3024. A limiting slider 3026 is installed between the two sets of first sliders 3025. A limiting groove 3027 is provided on the square slide rod 2062 to match the limiting slider 3026. The first rotating shaft 3011 drives the first bevel gear 3012 to rotate, achieving vertical reversal of power through meshing with the second bevel gear 3014, driving the second rotating shaft 3011. 13 and the end wide gear 3015 rotate to complete the conversion of "longitudinal power to lateral power". The wide gear 3015 meshes with the spur rack 3023 at the bottom of the second square collar 3021, converting the rotational power into linear motion, which drives the second square collar 3021 to move laterally along the square slide bar 2062. The second square collar 3021 pulls the front wheel connecting frame 203 through the second connecting rods 3022 on both sides, so that the front wheel can turn itself around the hinge axis 2043. At the same time, the first slider 3025 slides in the first slide groove 3024, and cooperates with the guide limit of the limiting slider 3026 and the limiting slide groove 3027 to ensure that the second square collar 3021 moves smoothly and does not deviate, and adapts to the position change after the wheel track is adjusted.

[0048] like Figures 11-16 and Figures 18-19As shown, the bottom of the annular mounting plate 7 in this embodiment is provided with a second steering mechanism 4 for driving the two front wheels to steer as a single unit. The second steering mechanism 4 includes a third bearing 404. The inner ring of the third bearing 404 is fixedly connected to the outer ring of the annular mounting plate 7. The outer ring of the third bearing 404 is fixedly connected to the bottom of the rice transplanter frame 1. An ellipse 401 is installed at the bottom of the outer side of the first rotating shaft 3011, and the ellipse 401 is located above the first bevel gear 3012. Active levers 402 are symmetrically installed at the two ends of the short axis on the outer side of the ellipse 401. A limiting component 403 for limiting the rotation of the annular mounting plate 7 is provided at the bottom of the rice transplanter frame 1 near the annular mounting plate 7. Four sets of active levers 402 are evenly installed on the inner ring of the annular mounting plate 7. 2. A driven lever 405 cooperates with each other. A rotary linkage component 406 cooperating with the active lever 402 is provided at the inner ring position of the top of the annular mounting plate 7. The limiting component 403 includes a slot 4035. Two sets of slots 4035 are provided, and the two sets of slots 4035 are symmetrically opened at the inner ring position of the annular mounting plate 7. The bottom of the rice transplanter frame 1 is symmetrically provided with a second slide groove 4031 centered on the first rotating shaft 3011. A second slider 4032 is provided inside the second slide groove 4031. A reset spring 4036 fixedly connected to the second slider 4032 is installed at one end of the second slide groove 4031 near the first rotating shaft 3011. A part of the top of the second slider 4032 near the reset spring 4036 is provided with a part that is connected to the ellipse 401. The rollers 4033 and the second slider 4032 are fitted with a locking block 4034 that cooperates with the slot 4035 at the other end. Four sets of driven levers 405 are symmetrically distributed about the straight line where the two sets of slots 4035 are located. The rotary linkage component 406 includes a storage groove 4061. Two sets of storage grooves 4061 are provided and are symmetrically opened on the inner ring of the annular mounting plate 7. The storage grooves 4061 are located on the inner ring of the annular mounting plate 7 near the driven levers 405. A telescopic lever 4062 that cooperates with the driving lever 402 is inserted inside the storage groove 4061. Two sets of strip-shaped through holes 4063 that communicate with the inside of the storage grooves 4061 are symmetrically opened on the top of the annular mounting plate 7. The top of the telescopic lever 4062 is close to the... One end of the outer ring of the annular mounting plate 7 is fitted with a connecting post 4064 that passes through the strip-shaped through hole 4063. The bottom of the rice transplanter frame 1 is symmetrically provided with a first arc-shaped groove 4065 and a second arc-shaped groove 4067 centered on the center of the annular mounting plate 7. The ends of the first arc-shaped groove 4065 and the second arc-shaped groove 4067 that are close to each other are connected by a connecting groove 4066. The diameter of the circle containing the first arc-shaped groove 4065 is larger than the diameter of the circle containing the second arc-shaped groove 4067, so as to realize the gradual extension and retraction of the telescopic lever 4062 during the rotation of the annular mounting plate 7. When the rice transplanter travels in a straight line, the protruding part of the elliptical body 401 pushes the roller 4033 on the top of the second slider 4032, causing the second slider 4032 to stretch the reset spring 4036 and move.This causes the locking block 4034 to engage with the slot 4035 of the annular mounting plate 7, restricting the rotation of the annular mounting plate 7. When turning, the elliptic body 401 rotates, and the roller 4033 gradually moves away from the protruding part of the elliptic body 401. At this time, the reset spring 4036 pulls the second slider 4032 and moves it. The locking block 4034 follows the second slider 4032 and disengages from the slot 4035, unlocking the annular mounting plate 7. The elliptic body 401 continues to rotate, and the active lever 402 at the end of the short axis abuts against it. The driven lever 405 on the inner ring of the annular mounting plate 7 drives the annular mounting plate 7 and the front wheel to rotate around the first rotating shaft 3011. During rotation, the connecting column 4064 moves along the first arc-shaped groove 4065 and the connecting groove 4066, causing the telescopic lever 4062 to extend and, together with the driven lever 405, limit the active lever 402, driving the annular mounting plate 7 to rotate in the opposite direction. Finally, the telescopic lever 4062 retracts into the storage groove 4061, and the locking block 4034 resets and locks, completing the return to center.

[0049] like Figure 1 and Figures 3-5 As shown, the front engine compartment 6 of this embodiment is equipped with a manual drive mechanism 5. The manual drive mechanism 5 provides driving force for the first steering mechanism 3 and the second steering mechanism 4. The manual drive mechanism 5 includes a steering wheel 501, which is located at the middle position of the top of the front engine compartment 6. A coupling 506 is installed at the bottom end of the steering wheel 501 shaft, and a worm gear 507 is installed at the end of the coupling 506 away from the steering wheel 501. The top end of the outer side of the first rotating shaft 3011 extends into the front engine compartment 6 and is equipped with a driven gear 502. A third rotating shaft 503 is located at the middle position inside the front engine compartment 6, and a driving gear 504 that meshes with the driven gear 502 is installed at the bottom end of the outer side of the third rotating shaft 503. The top end of the outer side of the third rotating shaft 503 is equipped with a... A worm wheel 505 meshes with the worm 507. When the operator turns the steering wheel 501, its shaft drives the worm 507 to rotate via a coupling 506. The coupling 506 can compensate for installation errors and prevent power transmission from jamming. The worm 507 meshes with the worm wheel 505 to achieve power deceleration and reversal, driving the third rotating shaft 503 to rotate. The worm wheel and worm gear transmission has a self-locking function to prevent the load from driving in the opposite direction. The third rotating shaft 503 meshes with the driven gear 502 via the driving gear 504, driving the first rotating shaft 3011 to rotate, thereby synchronously transmitting power to the transmission component 301 and the ellipse 401, providing unified power support for the two steering modes, realizing a single power source driving a dual steering mechanism, simplifying the equipment structure, avoiding interference from multiple power sources, and improving overall reliability.

[0050] The working principle of this embodiment is as follows: When the rice transplanter needs to turn at the edge of the field, the two sets of hydraulic cylinders 207 are shortened, forcing the two sets of square insertion rods 202 to move closer to each other. During this process, the top of the square insertion rod 202 continuously penetrates into the interior of the square insertion tube 201. At the same time, the square insertion rod 202, through the connecting seat 2063 and the first connecting rod 2065, pushes the first square collar 2064 to slide longitudinally along the axial direction of the square slide rod 2062. The limiting slider 3026 and the limiting groove 302 of the square slide rod 2062 are connected. 7. Always maintain sliding fit. When the second square collar 3021 moves laterally, the limiting slider 3026 slides synchronously along the limiting groove 3027 to ensure that the collar does not deviate. At this time, the square insertion rod 202 pulls the two sets of rice transplanter front wheels closer to each other along the axis of the second square collar 3021 through the front wheel connecting frame 203. When it is necessary to increase the distance between the front wheels, control the extension of the two sets of hydraulic cylinders 207 to push the two sets of square insertion rods 202 to slide outward along the square insertion tube 201 and move away from each other. Through the linkage of the connecting component 206, the two front wheels are driven to synchronously increase the distance.

[0051] The operator then manually turns the steering wheel 501. The shaft of the steering wheel 501 drives the worm gear 507 to rotate through the coupling 506. The worm gear 507 and worm wheel 505 drive the third rotating shaft 503 to rotate. The third rotating shaft 503 drives the first rotating shaft 3011 to rotate through the driving gear 504 and the driven gear 502. The first rotating shaft 3011 drives the second rotating shaft 3013 to rotate through the first bevel gear 3012 and the second bevel gear 3014 (the elliptical body 401 rotates synchronously with the first rotating shaft 3011). The second rotating shaft 3013 drives the second square collar 3021 to move laterally on the square slide bar 2062 (i.e., move towards the front wheel of the rice transplanter) through the wide gear 3015 and the rack 3023.

[0052] During the process, the position of the limiting slider 3026 remains unchanged within the limiting groove 3027, but the limiting slider 3026 slides with the first slider 3025 within the first groove 3024. The lateral movement of the second square collar 3021 pulls the front wheel connecting frame 203 around the hinge shaft 2043 via the second connecting rod 3022. At this time, the rice transplanter front wheel, which is rotatably connected to the front wheel connecting frame 203, will also rotate synchronously around the hinge shaft 2043. As the steering wheel continues to rotate in the same direction, the roller 4033 rolls from the end of the protruding part (the end of the major axis) to the point of minimum inner diameter of the outer ring of the ellipse 401 (the end of the minor axis) on the outer ring of the ellipse 401. When the ellipse 401 rotates 45°, the return spring 4036 pulls the second slider 4032, causing the locking block 4034 to completely disengage from the slot. Inside 4035, as the ellipse 401 continues to rotate, the active push block 402 on the outside of the ellipse 401 abuts against the driven push block 405 and drives the annular mounting plate 7 to rotate together, so that the two sets of front wheels of the rice transplanter rotate around the first rotating shaft 3011 as the axis, changing the travel direction of the two sets of front wheels of the rice transplanter. During this process, the top of one set of connecting columns 4064 enters the second arc groove 4067 from inside the first arc groove 4065 and then through the connecting groove 4066 (the other set of connecting columns 4064 keeps sliding inside the first arc groove 4065), and the connecting column 4064 drives the telescopic push block 4062 to gradually extend from the storage groove 4061. The telescopic push block 4062 and the adjacent set of driven push blocks 405 restrict the active push block 402 between them.

[0053] When the steering wheel 501 is turned, the active lever 402 will abut against one side of the telescopic lever 4062 and drive the annular mounting plate 7 to rotate together. As the annular mounting plate 7 continues to rotate back, the telescopic lever 4062 will gradually retract into the storage groove 4061. When the telescopic lever 4062 is completely retracted into the storage groove 4061, the protruding part of the ellipse 401 will push the locking block 4034 to re-lock into the locking groove 4035 through the roller 4033. At this time, the annular mounting plate 7 is in the straightened state. As the steering wheel 501 continues to rotate, it will drive the two sets of rice transplanter front wheels to rotate in opposite directions around the hinge shaft 2043 until the two sets of rice transplanter front wheels are completely straightened.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A steering structure for an adjustable rice transplanter, comprising a transplanter frame (1) and a front-mounted machine compartment (6) located at the top front end of the transplanter frame (1), characterized in that: The front end of the bottom of the rice transplanter frame (1) is provided with an annular mounting plate (7). The bottom of the annular mounting plate (7) along the front end area of ​​the rice transplanter frame (1) in the forward direction is provided with a wheel track adjustment mechanism (2) for adjusting the distance between the two front wheels. The bottom of the annular mounting plate (7) is provided with a first steering mechanism (3) for driving the two front wheels to turn themselves. The bottom of the annular mounting plate (7) is provided with a second steering mechanism (4) for driving the two front wheels to turn as a whole. The interior of the front machine compartment (6) is provided with a manual drive mechanism (5). The manual drive mechanism (5) provides driving force for the first steering mechanism (3) and the second steering mechanism (4). The wheel track adjustment mechanism (2) includes a square tube (201), and two sets of the square tube (201) are provided. The two sets of square tubes (201) are symmetrically hinged to the bottom of the annular mounting plate (7) on both sides near the front end of the rice transplanter frame (1). The inner bottom of the two sets of square tubes (201) is symmetrically provided with square rods (202). The bottom end of the square rods (202) is hinged to the front wheel connecting frame (203) through the hinge component (204). The two sets of front wheel connecting frames (203) are rotatably connected to the axle position of the two sets of front wheels through the first bearing (205) on the side away from each other. The bottom of the two sets of square rods (202) on the side close to each other is provided with a connecting component (206). The bottom of the annular mounting plate (7) is symmetrically hinged with hydraulic cylinders (207). The output ends of the two sets of hydraulic cylinders (207) are respectively hinged to the bottom of the outer side of the adjacent set of square rods (202). The connecting component (206) includes a connecting seat (2063), which is provided in two sets. The two sets of connecting seats (2063) are symmetrically installed on the bottom of the outer side of the two sets of square inserts (202). A U-shaped frame (2061) is installed at the middle position of the bottom of the annular mounting plate (7). A square slide rod (2062) is installed on the bottom of both sides of the U-shaped frame (2061). A slidable first square collar (2064) is sleeved on the outer side of the square slide rod (2062). A first connecting rod (2065) is symmetrically hinged on both sides of the first square collar (2064). The end of the first connecting rod (2065) away from the first square collar (2064) is hinged to the outer side of the adjacent set of connecting seats (2063).

2. The steering structure of the adjustable rice transplanter according to claim 1, characterized in that, The hinge component (204) includes a mounting groove (2041), which is located at the bottom of the square insert (202) near the front wheel connecting frame (203). A hinge frame (2044) is installed on the side of the front wheel connecting frame (203) near the square insert (202). The bottom end of the square insert (202) is rotatably connected to the hinge frame (2044) via a hinge shaft (2043). The hinge frame (2044) is located inside the mounting groove (2041). A shock-absorbing spring (2042) is sleeved on the outside of the hinge shaft (2043), and the top end of the shock-absorbing spring (2042) contacts the inner top of the mounting groove (2041). The bottom end of the shock-absorbing spring (2042) contacts the inner bottom of the hinge frame (2044).

3. The steering structure of the adjustable rice transplanter according to claim 2, characterized in that, The first steering mechanism (3) includes a second bearing (303), which is located at the front end of the bottom of the rice transplanter frame (1). The center of the second bearing (303) coincides with the center of the annular mounting plate (7). The inner ring of the second bearing (303) is provided with a transmission component (301) for power transmission. The outer side of the square slide bar (2062) is provided with a steering component (302) for pulling the two front wheels to rotate around the hinge shaft (2043). The transmission component (301) provides driving force for the steering component (302).

4. The steering structure of the adjustable rice transplanter according to claim 3, characterized in that, The transmission component (301) includes a first rotating shaft (3011) fixedly connected to the inner ring of the second bearing (303). A first bevel gear (3012) is installed at the bottom of the outer side of the first rotating shaft (3011). A rotatable second rotating shaft (3013) is provided at the middle position inside the U-shaped frame (2061). A second bevel gear (3014) that meshes with the first bevel gear (3012) is installed at one end of the outer side of the second rotating shaft (3013). A wide gear (3015) is installed at the other end of the outer side of the second rotating shaft (3013).

5. The steering structure of the adjustable rice transplanter according to claim 4, characterized in that, The steering component (302) includes a second square collar (3021) sleeved on the outside of a square slide rod (2062). The cross-sectional width of the inner cavity of the second square collar (3021) is greater than the cross-sectional width of the square slide rod (2062). Second connecting rods (3022) are symmetrically hinged to both sides of the second square collar (3021). One end of the second connecting rod (3022) away from the second square collar (3021) is hinged to one end of the outer side of an adjacent set of front wheel connecting frames (203). The bottom of the second square collar (3021) is provided with a straight rack (3023) that meshes with the wide gear (3015). The inner top and inner bottom of the second square collar (3021) are symmetrically provided with first sliding grooves (3024). The two sets of first sliding grooves (3024) are symmetrically provided with first sliders (3025). The two sets of first sliders (3025) are installed together with a limit slider (3026). The square slide bar (2062) is provided with a limit groove (3027) that is adapted to the limit slider (3026).

6. The steering structure of the adjustable rice transplanter according to claim 4, characterized in that, The second steering mechanism (4) includes a third bearing (404), the inner ring of which is fixedly connected to the outer ring of the annular mounting plate (7), and the outer ring of which is fixedly connected to the bottom of the rice transplanter frame (1). An ellipse (401) is installed at the bottom of the outer side of the first rotating shaft (3011), and the ellipse (401) is located above the first bevel gear (3012). Active levers (402) are symmetrically installed at the two ends of the short shaft on the outer side of the ellipse (401). A limiting component (403) for limiting the rotation of the annular mounting plate (7) is provided at the bottom of the rice transplanter frame (1) near the annular mounting plate (7). Four sets of driven levers (405) that cooperate with the active levers (402) are evenly installed on the inner ring of the annular mounting plate (7). A rotary linkage component (406) that cooperates with the active levers (402) is provided at the inner ring of the top of the annular mounting plate (7).

7. The steering structure of the adjustable rice transplanter according to claim 6, characterized in that, The limiting component (403) includes a slot (4035), and two sets of slots (4035) are provided, with the two sets of slots (4035) symmetrically located at the inner ring position of the annular mounting plate (7). The bottom of the rice transplanter frame (1) is symmetrically provided with a second sliding groove (4031) centered on the first rotating shaft (3011). A second sliding block (4032) is provided inside the second sliding groove (4031). The interior of the second sliding groove (4031) is close to the first rotating shaft (3011). 11) A reset spring (4036) is installed at one end and fixedly connected to the second slider (4032). A roller (4033) that cooperates with the ellipse (401) is provided at the top of the second slider (4032) near the reset spring (4036). A locking block (4034) that cooperates with the locking slot (4035) is installed at the other end of the second slider (4032). Four sets of driven blocks (405) are symmetrically distributed with the straight line where the two sets of locking slots (4035) are located as the axis.

8. The steering structure of the adjustable rice transplanter according to claim 6, characterized in that, The rotary linkage component (406) includes a storage slot (4061), which has two sets and is symmetrically arranged on the inner ring of the annular mounting plate (7). The storage slot (4061) is located on the inner ring of the annular mounting plate (7) near the driven lever (405). A telescopic lever (4062) that cooperates with the active lever (402) is inserted inside the storage slot (4061). The top of the annular mounting plate (7) has two sets of strip-shaped through holes (4063) that communicate with the inside of the storage slot (4061). The top of the telescopic lever (4062) is close to the annular ring. One end of the outer ring of the mounting plate (7) is equipped with a connecting post (4064) that passes through the strip-shaped through hole (4063). The bottom of the rice transplanter frame (1) is symmetrically provided with a first arc groove (4065) and a second arc groove (4067) with the center of the ring mounting plate (7) as the center. The ends of the first arc groove (4065) and the second arc groove (4067) that are close to each other are connected by a connecting groove (4066). The diameter of the circle in which the first arc groove (4065) is located is larger than the diameter of the circle in which the second arc groove (4067) is located, so as to realize the gradual extension and retraction of the telescopic lever (4062) during the rotation of the ring mounting plate (7).

9. The steering structure of the adjustable rice transplanter according to claim 4, characterized in that, The manual drive mechanism (5) includes a steering wheel (501) located at the middle position of the top of the front engine compartment (6). A coupling (506) is installed at the bottom end of the steering wheel (501) shaft, and a worm gear (507) is installed at the end of the coupling (506) away from the steering wheel (501). The top end of the outer side of the first rotating shaft (3011) extends into the front engine compartment (6) and is equipped with a driven gear (502). A third rotating shaft (503) is provided at the middle position inside the front engine compartment (6), and a driving gear (504) that meshes with the driven gear (502) is installed at the bottom end of the outer side of the third rotating shaft (503). A worm wheel (505) that meshes with the worm gear (507) is installed at the top end of the outer side of the third rotating shaft (503).

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