A cutting block structure for a seedling throwing machine

Abstract

The application discloses a cutting block structure for a seedling throwing machine, which indirectly drives a movable cutter bar by means of a poking rotary disc and a poking piece, and discards the rigid impact driving mode of a traditional cam directly pushing a cutter. In the rotating process of the poking rotary disc, the poking piece stably pulls a connecting head, drives the movable cutter bar to shrink inward and compresses a spring, and there is no instantaneous concentrated impact load, and the force storage process is gradually completed. The cam direct drive instantaneous load is too large to cause the bending deformation of a driving shaft and a cutter shaft, and the rod piece is not easy to deform in long-term operation, and the whole machine transmission operation is smooth and stable. By controlling the rotation of the poking rotary disc, the movement time and stroke of the poking piece can be accurately controlled, especially the shrinking time of the movable cutter bar can be accurately controlled, and the problem of shrinking lag caused by the spring pushing the cutter set to shrink is avoided, the mutual impact of the cutter and the seedling needle caused by the late shrinking of the cutter is avoided, and the continuous and uninterrupted seedling throwing operation is ensured.

Description

Technical Field

[0001] This invention relates to the field of rice transplanter technology, and in particular, to a cutting structure for a rice transplanter. Background Technology

[0002] Rice blanket seedling transplanting relies on a cutting structure to divide the continuous blanket of seedlings into uniform seedling blocks before transplanting. This is the core working component of the blanket seedling cutting transplanter. Currently, most transplanters on the market use a cam-driven direct-drive cutter assembly and a spring-driven individual return transmission scheme, which has revealed many unavoidable defects in actual field operations.

[0003] First, the cam-driven direct-push-cutter assembly generates a large instantaneous impact load when the cutter is instantly lifted, easily causing the cutter bar to bend and deform. Simultaneously, the force on the cutter bar end can easily cause the cutter to deviate, colliding and interfering with the seedling needles during operation, affecting the stability of the equipment. Second, the cutter bar end and cam are subjected to high impact loads continuously for a long time, easily leading to structural fracture and failure, resulting in a high equipment failure rate and high maintenance costs. Furthermore, the traditional cutting structure lacks a sealed outer shell and mud protection structure, allowing mud and slurry to splash into the internal transmission and engagement parts during paddy field operations, causing the mechanism to jam and further exacerbating the blade collision failure, significantly shortening the overall service life of the machine. Additionally, the traditional structure relies solely on springs to return the cutter assembly to its original position. Since the return action is not mechanically forced, the timing and movement of the return cannot be precisely controlled, resulting in poor return timing accuracy. Delayed return of the cutter assembly can easily cause the seedling needles to collide with the cutter, leading to jamming of the cutting structure, component damage, and affecting the continuity of transplanting operations. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a cutting structure for a rice transplanter.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A cutting structure for a rice transplanter includes: a shell with an internal mounting cavity; a rotary dial rotatably mounted in the mounting cavity; a movable blade rod extending and retracting through the side wall of the mounting cavity, one end of the movable blade rod extending out of the mounting cavity being connected to a cutter, and the other end being located inside the mounting cavity and connected to a connector; a spring located inside the mounting cavity, with one end abutting against the connector to apply an outward elastic force to the movable blade rod; and a deflector movably mounted in the mounting cavity and connected to the connector to drive the movable blade rod to extend and retract; wherein the rotation of the rotary dial drives the deflector to move, thereby at least causing the movable blade rod to retract inward and compress the spring.

[0006] Furthermore, the outer periphery of the actuating turntable includes an arc segment and a release segment; the actuating member is provided with a driving arm and an actuating arm, the actuating arm being connected to a connector; the actuating member has a charging state and a release state, and the actuating member is rotatably mounted in the mounting cavity to achieve switching between the charging state and the release state; under the action of the spring, the driving arm of the actuating member has a tendency to move closer to the actuating turntable; when the driving arm contacts the arc segment, the actuating member is in the charging state; when the driving arm enters the release segment, the actuating member is in the release state; during the process of the actuating member moving from the release state to the charging state, it can drive the movable blade to retract inward and compress the spring; as the actuating turntable rotates, the actuating member alternates between the charging state and the release state.

[0007] Furthermore, the outer periphery of the actuating turntable has a notch in the release section, and the release section has abrupt change surface, arc surface and transition surface connected in sequence; the arc surface is coaxial with the arc segment, and the diameter of the arc surface is smaller than the diameter of the arc segment; the opposite ends of the abrupt change surface and the transition surface are respectively connected to the two ends of the arc segment.

[0008] Furthermore, one end of the connector is hinged to the movable tool bar via a first pivot, and the other end is provided with a strip groove; the end of the drive arm is provided with a second pivot, and the end of the second pivot is embedded in the strip groove.

[0009] Furthermore, the first pivot and the second pivot are connected by a connecting plate to fix the distance between the first pivot and the second pivot.

[0010] Furthermore, the connector end is provided with a limiting protrusion for one end of the spring to be fitted.

[0011] Furthermore, the outer casing sidewall is threaded with a stud aligned with the spring axis. One end of the stud extends into the mounting cavity so that the end of the spring away from the connector is fitted onto it, while the other end is located outside the mounting cavity. An abutment plate is installed on the peripheral wall of the stud, and the end of the spring away from the connector abuts against the abutment plate.

[0012] Furthermore, a first preload nut is threaded onto the stud, and the first preload nut is located outside the mounting cavity and abuts against the outer shell.

[0013] Furthermore, the outer shell is threadedly connected to a limit adjustment post. One end of the limit adjustment post extends into the mounting cavity to abut against the actuating element in the released state. Adjusting the limit adjustment post can adjust the position of the actuating element in the released state, thereby adjusting the maximum length of the cutter extension.

[0014] Furthermore, a second preload nut is threaded onto the limit adjustment column.

[0015] The present invention has the following beneficial effects: This structure uses a rotary dial and actuating element to indirectly drive the movable cutter bar, abandoning the rigid impact drive method of the traditional cam directly pushing the cutter. During the rotation of the rotary dial, the actuating element smoothly pulls the connector, causing the movable cutter bar to contract inward and compress the spring. The release is also an elastic push, without rigid impact load, and the power accumulation process is also completed gradually. This solves the defects of existing cam direct drive technology, which suffers from excessive instantaneous load causing cutter bar bending and deformation, and the cutter bar is not easy to deform during long-term operation. The transmission of the whole machine is smooth and stable. Traditional cams and cutter bar ends (such as the end bearings) are subjected to high-frequency impact continuously, which is prone to structural breakage. This invention forms a buffered linkage transmission structure through the rotary dial and actuating element. There is no instantaneous violent impact at the contact points of the transmission structure, the impact load on the components is reduced, the wear rate of the components is slowed down, the probability of component breakage and failure is reduced, and the frequency of field failures and later maintenance and replacement costs are reduced. This structure features an outer shell forming a sealed mounting cavity, housing the rotary dial, actuating element, spring, and connectors. The outer shell effectively prevents splashed mud and water from paddy field operations, reducing the ingress of mud and sand. It overcomes the shortcomings of traditional structures lacking protective sealing, allowing mud intrusion to cause mechanical jamming and frequent blade collisions. The internal transmission components remain clean and flexible for extended periods, ensuring continuous operation of the cutting structure and extending the overall machine's lifespan. During operation, the rotary dial mechanically drives the actuating element to pull the movable blade inward, while the spring only provides elastic force for outward extension. This differs from traditional structures that rely solely on passive spring return without mechanical limit constraints. By controlling the rotation of the rotary dial, the timing and stroke of the actuating element's movement can be precisely controlled, especially the timing of the movable blade's retraction. This eliminates the lag caused by spring-driven blade retraction, completely preventing late blade retraction and collisions with the seedling needles, ensuring continuous and uninterrupted seedling transplanting operations. The spring abuts against the inside of the mounting cavity and between the connector and the cavity wall, applying an outward elastic force to the movable blade to complete the cutting operation. When the spring is compressed and stored, it is released, which can push the movable blade and the cutter outward to complete the cutting. If the cutter accidentally comes into contact with hard objects such as soil or hard blocks when it extends outward, the spring can absorb the impact force in real time, forming an elastic buffer, avoiding the impact load from being directly transmitted to the core transmission components such as the actuating parts and the actuating turntable, reducing the rigidity damage to the internal structure, and improving the equipment's resistance to foreign object impact.

[0016] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, 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 undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is an internal cross-sectional view of the released state; Figure 3 This is a partial cross-sectional view of the released state; Figure 4 This is an internal cross-sectional view of the power storage state; Figure 5 This is an internal isometric view of the released state; Figure 6 This is an exploded view of the relevant structures at the connector.

[0018] Legend: 100 housing, 110 mounting cavity, 120 connecting nut, 130 stud, 140 abutting plate, 150 first preload nut, 160 limit adjustment post, 170 second preload nut, 180 mounting nut; Rotary dial 200, arc segment 210, release segment 220, notch 230, abrupt change surface 221, arc surface 222, transition surface 223; Movable blade holder 300, cutter 310, connector 320, strip groove 321, limiting protrusion 322, first pivot 330, connecting plate 340; Spring 400; Actuator 500, drive arm 510, second pivot 511, and actuator arm 520. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative state relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0023] Please refer to Figure 1 and Figure 2 A preferred embodiment of the present invention provides a cutting structure for a rice transplanter, comprising a housing 100, a rotary table 200, a movable blade 300, a spring 400, and a moving element 500.

[0024] The housing 100 has a mounting cavity 110 inside.

[0025] Rotate the turntable 200 to install it in the mounting cavity 110.

[0026] The movable cutter bar 300 is telescopically inserted through the side wall of the mounting cavity 110. One end of the movable cutter bar 300 extending out of the mounting cavity 110 is connected to a cutter 310, and the other end is located inside the mounting cavity 110 and connected to a connector 320. The side wall of the mounting cavity 110 may be provided with a cutter bar guide structure to guide the telescopic movement of the cutter bar. For example, the side wall of the mounting cavity 110 may be provided with a perforation to install a guide sleeve for the telescopic movement of the cutter bar.

[0027] Spring 400 is located in mounting cavity 110. One end of spring 400 abuts against connector 320 to apply an outward elastic force to movable tool bar 300. Spring 400 is specifically a compression spring.

[0028] The actuating element 500 is movably installed in the mounting cavity 110. The actuating element 500 is connected to the connector 320 to drive the movable tool bar 300 to extend and retract. The rotation of the actuating turntable 200 can drive the actuating element 500 to move, thereby at least causing the movable tool bar 300 to retract inward and compress the spring 400.

[0029] This invention provides a cutting structure for a rice transplanter, employing a rotary dial 200 and actuating element 500 to indirectly drive the movable cutter bar 300, thus abandoning the rigid impact drive method of the traditional cam directly pushing the cutter. During the rotation of the rotary dial 200, the actuating element 500 smoothly pulls the connecting head 320, causing the movable cutter bar 300 to contract inward and compress the spring 400. Release is also an elastic push, eliminating rigid impact loads, and the power accumulation process is gradual. This solves the problem of excessive instantaneous load causing cutter bar bending and deformation in existing cam-driven direct-drive systems, ensuring the cutter bar is less prone to deformation during long-term operation, and resulting in smooth and stable overall machine transmission. Traditional cams and the end of the cutter bar (such as the bearing at the end) are subjected to high-frequency impacts, which can easily lead to structural breakage. Furthermore, when the cam pushes the end of the cutter bar to extend and retract, the curved surface inevitably generates radial forces. This results in the cutter bar being subjected to a large radial force, causing the cutter 310 and the movable cutter bar 300 to deviate during movement, leading to collisions and interference with the seedling needles during operation. However, using the actuating element 500 to drive the movable cutter bar 300 to extend and retract can effectively reduce this radial force and reduce movement deviation. Furthermore, existing technologies using springs to push the cutter bar back into position result in a longer cutter bar length due to the contact between the cutter bar end and the cam, and the need for a spring in the middle. This leads to a longer distance between the cutter bar guide structure (such as a guide sleeve) and the cutter bar end. When the cutter bar end is subjected to axial and radial forces from the cam, the lever arm is long, making the cutter bar prone to skew and causing excessive load on the middle section, potentially leading to bending and damage. In contrast, the connection position between the actuating element 500 and the movable cutter bar 300 in this structure is close to the position where the movable cutter bar 300 mates with the cutter bar guide structure, resulting in a shorter lever arm and further reducing the degree of skew. Additionally, existing technologies require overcoming the elastic force of the spring when the cam pushes the cutter bar for cutting, and the cam's thrust is smaller at the end of its stroke, weakening the cutting force and potentially causing incomplete cutting. In contrast, in this invention, when the cutter bar extends outward, the spring stores energy and pushes the cutter bar outward quickly for cutting, eliminating the need to overcome the elastic force and resulting in more thorough cutting.

[0030] This invention utilizes a rotating disc 200 and actuating element 500 to form a buffered linkage transmission structure. This eliminates instantaneous, violent impacts at the transmission structure contact points, reducing the impact load on components, slowing down component wear, lowering the probability of component breakage and failure, and reducing the frequency of field malfunctions and subsequent maintenance and replacement costs. The structure includes an outer shell 100 forming a sealed mounting cavity 110, where the rotating disc 200, actuating element 500, spring 400, and connector 320 are all housed. The outer shell 100 effectively prevents splashed mud and water from paddy field operations, reducing the ingress of mud and sand. This overcomes the shortcomings of traditional structures, such as lack of protective sealing, mud intrusion causing mechanism jamming, and frequent blade collisions. The internal transmission components remain clean and flexible for extended periods, ensuring continuous operation of the cutting structure and extending the overall machine's service life. During operation, the rotary dial 200 mechanically drives the actuating element 500 to pull the movable blade 300 inward, while the spring 400 only provides elastic force for outward extension. This differs from traditional structures that rely solely on the spring for passive return and lack mechanical limit constraints. By controlling the rotation of the rotary dial 200, the timing and stroke of the actuating element 500 can be precisely controlled, especially the retraction timing of the movable blade 300. This avoids the lag caused by relying solely on the spring to drive the cutter's retraction, and completely prevents the cutter 310 from retracting too late and colliding with the seedling needle, ensuring continuous and uninterrupted seedling transplanting operations. Spring 400 abuts against the inside of mounting cavity 110 and between connector 320 and cavity wall, applying an outward pushing force to movable blade 300 to complete the cutting operation. When spring 400 is compressed and stored, it releases, pushing movable blade 300 and cutter 310 outward to complete the cutting action. If cutter 310 accidentally comes into contact with hard objects such as soil when extending outward, spring 400 can absorb the impact force in real time, forming an elastic buffer to prevent the impact load from being directly transmitted to core transmission components such as actuating element 500 and actuating turntable 200, reducing internal structural rigidity damage and improving the equipment's resistance to foreign object impact. Through the coordinated linkage of housing 100, actuating turntable 200, movable blade 300, spring 400, and actuating element 500, the driving form of the existing technology of cam directly pushing the cutter assembly is replaced, avoiding the defects of traditional cutting structures in terms of load impact, component protection, return control, and overall machine operation stability.

[0031] Reference Figures 2 to 4 In some embodiments of the present invention, the outer periphery of the actuating turntable 200 includes an arc segment 210 and a release segment 220; the actuating member 500 is provided with a driving arm 510 and an actuating arm 520; the actuating arm 520 is connected to the connector 320; the actuating member 500 has a charging state and a releasing state, and the actuating member 500 is rotatably mounted in the mounting cavity 110 to realize the switching between the charging state and the releasing state; under the action of the spring 400, the driving arm 510 of the actuating member 500 has a tendency to move closer to the actuating turntable 200; see reference. Figure 4When the drive arm 510 contacts the arc segment 210, the actuating member 500 is in a charged state, and the actuating member 500 has an arc surface that contacts the arc segment 210, which is a surface contact, rather than the line contact between the cam and the tool holder in the prior art; see reference. Figure 3 and Figure 5 When the drive arm 510 enters the release section 220, the actuating element 500 is in the release state. During the process of the actuating element 500 moving from the release state to the storage state, it can drive the movable blade 300 to retract inward and compress the spring 400. As the actuating turntable 200 rotates, the actuating element 500 alternates between the storage state and the release state. When the actuating turntable 200 rotates and the drive arm 510 enters the arc section 210 from the release section 220, it pushes the actuating element 500 to rotate. The actuating arm 520 on the actuating element 500 pulls the connector 320, causing the movable blade 300 to retract inward and compress the spring 400 to complete the storage. When the drive arm 510 rotates into the release section 220, the turntable limit constraint disappears, and the spring 400 instantly releases the elastic thrust, driving the movable blade 300 and the cutter 310 to quickly pop outward to cut the blanket-like seedlings. Compared to traditional cam-driven direct drive cutting that relies solely on mechanical pushing, this structure utilizes spring-stored energy for ejection, resulting in sufficient cutting impact. The load is gradually applied during the energy storage process, unlike the sudden, instantaneous impact of traditional cams. The drive arm 510, the actuating turntable 200, and internal transmission components experience less long-term load, extending component lifespan, reducing maintenance frequency, and minimizing the instantaneous impact load during the energy storage phase. The arc segment 210 and release segment 220 are continuously arranged along the outer circumference of the actuating turntable 200. The turntable's uniform rotation automatically cycles between energy storage and release states. The duration of energy storage and the timing of ejection release in each round of cutting are precisely controlled by the turntable's contour. Furthermore, the retraction does not rely on spring return; instead, it utilizes the transmission of the actuating turntable 200, the actuating element 500, and the connector 320 to achieve rigid mechanical motion control. This eliminates the impact of spring fatigue on the cutter 310's retraction, solving the problems of poor timing control and collisions between the cutter 310 and the seedling needle in traditional pure spring-driven systems, thus improving the stability of continuous operation. The spring 400 continuously applies outward elastic force to the connector 320, which is transmitted to the drive arm 510 through the actuating arm 520, so that the drive arm 510 always presses against the outer periphery of the actuating turntable 200. The turntable rotates without disengagement or slippage, and the transmission is continuous and reliable throughout the entire process.

[0032] Reference Figures 2 to 4In a further embodiment of the present invention, a notch 230 is provided on the outer periphery of the turntable 200 in the release section 220, thereby forming the release section 220. The release section 220 has abrupt change surface 221, an arc surface 222, and a transition surface 223 connected in sequence; the arc surface 222 is coaxially arranged with the arc section 210, and the diameter of the arc surface 222 is smaller than the diameter of the arc section 210; the opposite ends of the abrupt change surface 221 and the transition surface 223 are respectively connected to the two ends of the arc section 210. When the drive arm 510 slides to the abrupt change surface 221, the radial support height decreases instantaneously, the elastic force stored in the spring 400 is released instantaneously, and the cutter 310 pops out instantly to form a short and strong cutting impact, which is more effective for cutting clumps of soil and aging seedling roots, and will not cause problems such as slow cutter advancement and dragging of seedlings. The arc surface 222 and the arc segment 210 are arranged coaxially. When the drive arm 510 slides into the arc surface 222, it can stably maintain the release position. The cutter 310 extends fully and maintains a sufficient cutting stroke to ensure that the blanket-like seedling is completely cut off, reducing defects such as cutter retraction midway and incomplete cutting. When the turntable rotates, the drive arm 510 smoothly climbs back up the large-diameter arc segment 210 through the transition surface 223. The load gradually increases, avoiding direct hard impact that would cause a large impact load. This reduces the impact wear of the actuating component 500 and the actuating turntable 200, resulting in lower operating noise. When the drive arm 510 enters the release section 220, the drive arm 510 will be inserted into the notch 230 to release the spring and the cutter 310 will extend outward. Due to the limitation of other limiting structures (such as the limiting adjustment column 160), when the toggle member 500 is in the released state, the drive arm 510 may come into contact with the surface of the arc surface 222 or have a certain distance from the arc surface 222 as the toggle turntable 200 rotates. As the toggle turntable 200 rotates, at least part of the transition surface 223 will come into contact with the drive arm 510 and push the drive arm 510 to move, thereby compressing the spring 400.

[0033] Reference Figure 3 and Figure 6In some embodiments of the present invention, one end of the connector 320 is hinged to the movable tool bar 300 via a first pivot 330, and the other end is provided with a strip groove 321; the end of the drive arm 510 is provided with a second pivot 511, and the end of the second pivot 511 is embedded in the strip groove 321. The actuating member 500 has a swing motion, and the movable tool bar 300 has a linear extension and retraction motion, and there is a displacement difference between their motion trajectories; the second pivot 511 can slide freely in the strip groove 321, automatically compensating for the travel difference between the swing and linear motions, avoiding transmission interference and jamming, and ensuring that the extension and retraction of the movable tool bar 300 is smooth and unobstructed. The first pivot 330 undertakes the swing hinge between the connector 320 and the movable tool bar 300, and the second pivot 511 undertakes the linkage sliding between the actuating member 500 and the connector 320. The length direction or extension direction of the strip groove 321 is perpendicular or nearly perpendicular to the radial direction of the first pivot 330. The two ends of the strip groove 321 form sliding limits, which restrict the sliding distance of the second pivot 511 and indirectly limit the range of motion of the movable tool holder 300.

[0034] Reference Figure 6 In a further embodiment of the present invention, the first pivot 330 and the second pivot 511 are connected by a connecting plate 340 to fix the distance between the first pivot 330 and the second pivot 511. The connecting plate 340 fixes the distance between the first pivot 330 and the second pivot 511, ensuring that the contraction amount of the movable blade 300 is consistent with each swing of the actuating member 500, the compression amount of the spring 400 is consistent each time, and the ejection force of the cutter 310 is stable each time. The connecting plate 340 connects the two pivots into one unit, making the overall rigidity of the transmission mechanism stronger, less prone to deformation during long-term heavy-load operation, and preventing the cutter 310 from deflecting and hitting the seedling needle.

[0035] In some embodiments of the present invention, the end of the connector 320 is provided with a limiting protrusion 322 for one end of the spring 400 to be fitted. The limiting protrusion 322 is inserted into the inner ring of the spring 400, restricting the radial movement of the spring 400. Throughout the compression and ejection process, the spring 400 remains coaxial with the movable cutter bar 300, and all elastic force is transmitted along the axial direction of the cutter bar, reducing component force loss and maximizing the utilization rate of cutting elasticity; at the same time, it prevents the spring 400 from slipping off the connector 320 and failing.

[0036] Reference Figure 3 and Figure 4In some embodiments of the present invention, a stud 130 aligned axially with the spring 400 is threadedly connected to the side wall of the outer casing 100. A through hole is provided on the side wall of the outer casing 100, and a connecting nut 120 aligned with the through hole is welded thereon for threaded connection of the stud 130. Alternatively, in other embodiments, a threaded hole can be provided on the side wall of the outer casing 100 for direct threaded connection of the stud. One end of the stud 130 extends into the mounting cavity 110, allowing the end of the spring 400 away from the connector 320 to be fitted, while the other end is located outside the mounting cavity 110. Abutment plates 140 are installed on the peripheral wall of the stud 130, and the end of the spring 400 away from the connector 320 abuts against the abutment plates 140. The stud 130 is rotatable and steplessly adjustable to adjust the pre-compression of the spring 400, adapting to different soil types. Rotating the stud 130 changes the axial position of the abutment piece 140 within the mounting cavity 110, adjusting the initial preload of the spring 400. When the soil is hard and the seedlings are thick, screwing in the stud increases the preload, enhancing the cutting and ejection force. When the soil is soft and the seedlings are thin, unscrewing the stud reduces the spring force, preventing excessive impact from the cutter and breakage of the seedling pieces, thus broadening the range of seedling adaptability. The abutment piece 140 has a flat, annular structure, with a large area of ​​the spring 400 end fitting against it for pressure. The stud 130 is exposed externally, allowing for spring force adjustment without disassembling the outer casing 100. The adjustment is performed on the outside of the casing 100, without opening the sealed mounting cavity 110. The cutting force can be adjusted in real-time in the field according to the seedling condition, simplifying operation. The stud 130 also acts as a radial limiter for the spring, working in conjunction with the limiting protrusion 322 to achieve coaxial positioning of both ends of the spring. The two ends of the spring are respectively fitted onto the limiting protrusion 322 and the stud 130, limiting the radial displacement of the spring. This reduces the off-center load during spring compression and ejection, ensuring smooth extension and retraction of the movable tool holder 300 without jamming. The abutment piece 140 is annular and fitted onto the stud 130. The stud 130 has a pin hole on its peripheral wall to insert a cotter pin, thereby abutting the abutment piece 140 to bear the force of the spring.

[0037] Reference Figure 3 and Figure 4 In a further embodiment of the present invention, a first preload nut 150 is threaded onto the stud 130. The first preload nut 150 is located outside the mounting cavity 110 and abuts against the outer shell 100. During rice transplanting operations, continuous vibration can cause the stud 130 to easily rotate and shift without a locking structure, leading to changes in spring force and unstable cutting force. Tightening the first preload nut 150 presses it against the outer wall of the outer shell 100, locking the threaded position of the stud 130. The preload parameter remains constant throughout the operation, preventing automatic loosening under vibration, ensuring long-term stability of the preload force and consistent cutting quality. After adjusting the stud 130 to a suitable spring force, simply tightening the first preload nut 150 secures it. A single adjustment allows for long-term operation without frequent checks of the spring preload.

[0038] Reference Figure 3 and Figure 4In some embodiments of the present invention, the outer casing 100 is threadedly connected to a limiting adjustment post 160. Specifically, the side wall of the outer casing 100 has a through hole and a mounting nut 180 aligned with the through hole is welded thereon for threaded connection of the limiting adjustment post 160. Of course, in other embodiments, a threaded hole can be directly provided on the side wall of the outer casing 100 for threaded connection of the limiting adjustment post 160. One end of the limiting adjustment post 160 extends into the mounting cavity 110 to abut against the actuating member 500 in the released state. Adjusting the limiting adjustment post 160 can adjust the position of the actuating member 500 in the released state, thereby adjusting the maximum extension length of the cutter 310. By rotating the limiting adjustment post 160, the extreme position of the actuating member 500 is changed, thereby adjusting the maximum extension length of the cutter 310. When it is necessary to shorten the extension length of the cutter 310, the limit adjustment column 160 can be screwed in to limit the release angle of the actuating element 500, thus shortening the extension length of the cutter 310 and preventing the cutter from excessively cutting down and piercing the bottom plate of the seedling tray, thus damaging the blade. When it is necessary to increase the extension of the cutter, the limit adjustment column 160 can be screwed out to increase the extension of the cutter. When facing seedling trays with thick soil layers, the extension of the cutter can be increased; when facing seedling trays with thin soil layers, the extension length of the cutter 310 can be shortened. This allows for adaptation to blanket-shaped seedling trays of different thicknesses. The precise adjustment of the cutting stroke of the cutter 310 adapts to blanket-shaped seedling trays of different thicknesses. The limit adjustment column 160 provides a mechanical hard limit for the release of the actuating element 500 at its maximum angle, preventing the cutter 310 from extending unrestricted and violently impacting the seedling tray or hard objects on the machine frame. This protects the cutter 310 and the movable blade shank 300, reducing blade chipping and blade bending failures. The limit adjustment column 160 is partially externally located in the mounting cavity 110, allowing for quick adjustment of the cutting stroke and depth without disassembling the entire machine, and without removing the sealed outer shell 100. Furthermore, when in the released state, the actuating element 500 is activated by an elastic force, and is counteracted by the limit adjustment column 160, thus dissipating the force onto the limit adjustment column 160. This prevents a rigid collision between the drive arm 510 and the actuating turntable 200, reducing impact on the drive arm 510 and preventing damage. The actuating element has a thickened portion for contact with the limit adjustment column, thereby structurally reinforcing the impact-prone area.

[0039] Reference Figure 3 and Figure 4 In some embodiments of the present invention, a second preload nut 170 is threaded onto the limiting adjustment column 160. High-frequency vibrations in the field can easily cause the threads of the limiting adjustment column 160 to loosen, resulting in a deviation in the cutter extension length and uneven cutting depth. Tightening the second preload nut 170 locks the limiting adjustment column 160, ensuring a fixed adjustment stroke and uniform cutting size. Combined with the first preload nut 150 locking the spring preload and the second preload nut 170 locking the cutter extension stroke, both core cutting parameters are fully locked to prevent loosening. This prevents parameter drift during long-term continuous operation, eliminating the need for mid-operation stoppages for readjustment and improving the efficiency of rice transplanting.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cutting structure for a rice transplanter, characterized in that, include: The outer casing (100) has an internal mounting cavity (110). Rotate the turntable (200) to rotate the mounting cavity (110); The movable blade (300) is telescopically inserted through the side wall of the mounting cavity (110). One end of the movable blade (300) extending out of the mounting cavity (110) is connected to a cutter (310), and the other end is located in the mounting cavity (110) and connected to a connector (320). A spring (400) is provided in the mounting cavity (110), and one end abuts against the connector (320) to apply an outward elastic force to the movable tool bar (300); A toggle element (500) is movably installed in the mounting cavity (110) and connected to the connector (320) to drive the movable tool bar (300) to extend and retract. The rotation of the actuating turntable (200) can drive the actuating element (500) to move, thereby at least causing the movable knife bar (300) to retract inward and compress the spring (400).

2. The cutting structure for the rice transplanter according to claim 1, characterized in that, The outer periphery of the rotary dial (200) includes an arc segment (210) and a release segment (220); the actuating member (500) is provided with a drive arm (510) and an actuating arm (520); the actuating arm (520) is connected to the connector (320); the actuating member (500) has a charging state and a releasing state, and the actuating member (500) is rotatably mounted in the mounting cavity (110) to realize the switching between the charging state and the releasing state; under the action of the spring (400), the drive arm (510) of the actuating member (500) has a connection with the rotary dial. (200) The tendency of the movement to approach; when the drive arm (510) contacts the arc segment (210), the actuating element (500) is in a stored state; when the drive arm (510) enters the release segment (220), the actuating element (500) is in a released state; during the process of the actuating element (500) moving from the released state to the stored state, it can drive the movable knife bar (300) to retract inward and compress the spring (400); as the actuating turntable (200) rotates, the actuating element (500) alternates between the stored state and the released state.

3. The cutting structure for the rice transplanter according to claim 2, characterized in that, The outer periphery of the rotary dial (200) has a notch (230) in the release section (220). The release section (220) has abrupt change surface (221), arc surface (222) and transition surface (223) connected in sequence. The arc surface (222) is coaxial with the arc segment (210), and the diameter of the arc surface (222) is smaller than the diameter of the arc segment (210). The opposite ends of the abrupt change surface (221) and the transition surface (223) are respectively connected to the two ends of the arc segment (210).

4. The cutting structure for the rice transplanter according to claim 2, characterized in that, One end of the connector (320) is hinged to the movable tool bar (300) via a first pivot (330), and the other end is provided with a strip groove (321); the end of the drive arm (510) is provided with a second pivot (511), and the end of the second pivot (511) is embedded in the strip groove (321).

5. The cutting structure for a rice transplanter according to claim 4, characterized in that, The first pivot (330) and the second pivot (511) are connected by a connecting plate (340) so that the distance between the first pivot (330) and the second pivot (511) is fixed.

6. The cutting structure for the rice transplanter according to claim 1, characterized in that, The connector (320) has a limiting protrusion (322) at one end for the spring (400) to be fitted onto.

7. The cutting structure for a rice transplanter according to claim 1, characterized in that, The outer casing (100) has a threaded connection on its side wall with a stud (130) aligned axially with the spring (400). One end of the stud (130) extends into the mounting cavity (110) so that the end of the spring (400) away from the connector (320) can be fitted, and the other end is located outside the mounting cavity (110). Abutment plate (140) is installed on the peripheral wall of the stud (130), and the end of the spring (400) away from the connector (320) abuts against the abutment plate (140).

8. The cutting structure for a rice transplanter according to claim 7, characterized in that, The stud (130) is threaded with a first preload nut (150), which is located outside the mounting cavity (110) and abuts against the outer shell (100).

9. The cutting structure for a rice transplanter according to claim 1, characterized in that, The outer casing (100) is threadedly connected to a limit adjustment post (160). One end of the limit adjustment post (160) extends into the mounting cavity (110) so that the toggle member (500) in the released state can abut against it. Adjusting the limit adjustment post (160) can adjust the position of the toggle member (500) in the released state, thereby adjusting the maximum length of the cutter (310) extending.

10. The cutting structure for a rice transplanter according to claim 9, characterized in that, The limit adjustment column (160) is threaded with a second preload nut (170).

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