Rice transplanter and film covering device thereof

Abstract

The invention discloses a rice transplanter and a film covering device thereof, and belongs to the field of rice transplanters, the film covering device of the rice transplanter comprises a base plate used for being connected to a rice transplanter rack, and further comprises a supporting shaft, a cover plate, a fixing plate, a jacking shaft and a jacking piece; one side of the cover plate is hinged to the base plate, the cover plate is movably connected with a control part, the control part can fasten the cover plate and the base plate, and when the control part is separated from the base plate, the cover plate can rotate towards the side away from the supporting shaft, so that the top shaft is synchronously away from the supporting shaft; the other end of the supporting shaft is fixed to a jacking piece, part of the jacking piece penetrates through a fixing plate, the fixing plate is fixedly connected to the base plate, and a second bearing is arranged between the jacking piece and the fixing plate, so that the supporting shaft can rotate relative to the fixing plate through the second bearing; the supporting shaft is detachably connected with the jacking piece, so that the supporting shaft can slide relative to the jacking piece, and the relative distance between the supporting shaft and the jacking piece is changed. The problem of the installation precision of the supporting shaft can be effectively solved, and the mulching film roll is easy to disassemble and assemble.

Description

Technical Field

[0001] The present invention relates to the technical field of rice transplanters, and more particularly to a rice transplanter and a film covering device thereof. Background Art

[0002] A rice transplanter is an agricultural machine that plants rice seedlings in rice fields. Some existing rice transplanters are equipped with a film covering device to reduce water evaporation, inhibit weed growth, protect soil structure, and improve soil nutrient utilization by covering the ground with film during operation. At the same time, it reduces the pollution of agricultural production to the environment, promotes the healthy growth of rice, and increases yield.

[0003] The existing film covering device has a support shaft for the film roll, and bearings are arranged at both ends of the support shaft. The bearings provide resistance when the support shaft rotates to tighten the output film. The film has ductility, and proper tightening can also save the film and use the ductility to lay a larger area.

[0004] Specifically, since the support shaft often faces the need to add ground film rolls, the bearing at one end of the support shaft needs to be set on the top shaft, and the top shaft supports the support shaft to transfer the bearing resistance to the ground film. When the support shaft needs to be replaced or a ground film roll needs to be added, the top shaft and the bearing on it are separated so that one end of the support shaft is open, and the user inserts the ground film roll from this end.

[0005] Therefore, the bearing can only work effectively when the support shaft is tightened.

[0006] However, due to assembly accuracy issues, it is difficult to tighten the support shaft of the drum using only a simple jacking shaft. This will cause the support shaft to be too loose when rotating, and the bearing will not work, causing the mulch to be wrinkled when laid on the field, affecting the transplanting effect (the seedlings will fall to one side and cannot pass through the mulch film and be planted in the field).

[0007] For example, a Chinese patent document (publication number: CN 116830948 A) provides a device for adjusting the tightness of a ground film of a rice transplanter, which is a film covering device, comprising a mounting seat fixedly mounted on the rice transplanter, a film shaft rotatably mounted on the mounting seat (equivalent to the support shaft of the present application), and a ground film wound on the film shaft. A bearing assembly is installed in the bearing seat of the device, and a spring is sleeved on the rotating shaft and pressed against the adjusting nut and the bearing assembly respectively. The spring can provide pressure to the conical connecting portion (equivalent to the top shaft of the present application), so that it overcomes the problem of assembly accuracy to support the film shaft and output the tightened ground film.

[0008] Since the covering device is located close to the chassis of the rice transplanter, it is often disturbed by splashing mud and water. Although the covering device provided by the above patent document can solve the problem of the matching of the support shaft and the bearing, it is relatively complicated and difficult to maintain and clean in a harsh working environment. Moreover, when the user needs to add or replace the ground film roll, it is sometimes necessary to operate in the mud and use tools to remove the parts on both sides of the support shaft. For example, when replacing the ground film roll in the above patent, the adjusting nut used to tighten the spring must be removed first, which is very troublesome. Small parts are often lost during the disassembly and assembly process.

[0009] For the above problems, the related technologies do not provide effective solutions. Summary of the invention

[0010] The present application provides a rice transplanter and a film covering device thereof, so as to solve the problems that the ground film output by the existing rice transplanter is relatively loose, and the ground film replacement efficiency is low and the difficulty is relatively large.

[0011] Some embodiments of the present application provide a rice transplanter film covering device, comprising a base plate for connecting to a frame, and further comprising: a support shaft, a cover plate, a fixing plate, a top shaft, and a tightening member; one end of the support shaft is supported by the top shaft, a portion of the top shaft passes through the cover plate, and a first bearing is provided between the top shaft and the cover plate, so that the support shaft can rotate relative to the cover plate through the first bearing;

[0012] One side of the cover plate is hinged to the base plate, and the cover plate is movably connected with a manipulation member, and the manipulation member can fasten the cover plate and the base plate, and when the manipulation member is separated from the base plate, the cover plate can rotate toward a side away from the support shaft, so that the top shaft is synchronously away from the support shaft;

[0013] The other end of the support shaft is fixed to the pressing member, a portion of the pressing member passes through the fixing plate, the fixing plate is fixedly connected to the base plate, and a second bearing is provided between the pressing member and the fixing plate, so that the support shaft can rotate relative to the fixing plate through the second bearing;

[0014] The support shaft is detachably connected to the pressing member, so that the support shaft can slide relative to the pressing member to change the relative distance between the support shaft and the pressing member.

[0015] Furthermore, the clamping member is rod-shaped, and a limiting groove is formed on its axial surface. The supporting shaft is formed with a matching hole. The clamping member is inserted into the supporting shaft so that the matching hole is opposite to the limiting groove. The matching hole is fixed in relative position with the limiting groove by an inserted shaft. The inserted shaft is inserted into the matching hole and supports the bottom surface of the limiting groove. The length of the limiting groove along the axial direction of the supporting shaft is L1, and the length of the matching hole along the axial direction of the supporting shaft is L2, and L1>L2.

[0016] Furthermore, the length of the limiting groove along the axial direction of the support shaft is L1, the length of the matching hole along the axial direction of the support shaft is L2, and L1>3L2.

[0017] Furthermore, the outer periphery of the clamping member is provided with an outwardly protruding clamping platform, the end face of the clamping platform is against the second bearing, and the clamping member is formed with a clamping groove on the side of the second bearing away from the clamping platform, and a clamping ring is installed in the clamping groove to prevent the second bearing from axial movement.

[0018] Furthermore, an inner wall of the matching hole is formed with an internal thread, and an outer wall of the insertion shaft is formed with an external thread.

[0019] Furthermore, the base plate includes a first connecting plate and a second connecting plate, the cover plate is hinged to the first connecting plate, and the fixing plate is fixedly connected to the second connecting plate.

[0020] Furthermore, the operating member is constructed in a rod shape, the middle part of the operating member is rotatably connected to the side of the cover plate, a hook is formed at one end of the operating rod, and a notch is formed on the side of the first connecting plate. When the operating rod rotates, the hook can enter or escape from the notch.

[0021] Furthermore, the base plate also includes a semi-cylindrical protective plate, the support shaft is located inside the protective plate, and two sides of the protective plate are respectively connected to the first connecting plate and the second connecting plate.

[0022] Furthermore, the cover plate is connected to a cylindrical first loading part, the fixing plate is connected to a cylindrical second loading part, the first bearing is located in the first loading part and can rotate relative to the first loading part, and the second bearing is located in the second loading part and can rotate relative to the second loading part.

[0023] To solve the above problems, some embodiments of the present application also provide a rice transplanter, comprising a rice transplanter covering device of any of the above schemes; the substrate is connected to a frame; the rice transplanter covering device also includes a film pressing roller; the film pressing roller is fixedly connected to the substrate, and the support shaft is used to output ground film to the film pressing roller.

[0024] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0025] (1) At a position close to the fixed plate, the user can change the relative position of the top tightening member and the support shaft, which not only effectively solves the problem of the installation accuracy of the support shaft, but also enables the support shaft to output a tighter ground film. In addition, the top tightening member is located at the end of the support shaft away from the cover plate, which further simplifies the structure of the cover plate and further achieves lightweight. The user can easily adjust the operating member to rotate the cover plate so that the top shaft on the cover plate is directly separated from the support shaft, thereby quickly replacing the ground film roll with simple operation. As a result, the components of the rice transplanter covering device are reasonably arranged, and the overall structure is easy to repair and maintain, which is suitable for the working environment with more sludge at the bottom of the rice transplanter and is relatively harsh;

[0026] (2) The clamping piece is rod-shaped, and a limiting groove is formed on its axial surface. The supporting shaft is formed with a matching hole. The clamping piece is inserted into the supporting shaft so that the matching hole is opposite to the limiting groove. The matching hole is fixed in relative position to the limiting groove by the inserted shaft. The inserted shaft is inserted into the matching hole and presses against the bottom surface of the limiting groove. The length of the limiting groove along the axial direction of the supporting shaft is L1, and the length of the matching hole along the axial direction of the supporting shaft is L2, L1>L2. The length difference between L1 and L2 can provide adjustment space for the position between the supporting shaft and the clamping piece. Compared with the spring tightening solution, it has higher stability, is beneficial to the balance of the overall output of the ground membrane, avoids the situation of unilateral floating of the ground membrane, is easier to clean when facing mud splashing interference, and has a long service life;

[0027] (3) An internal thread is formed on the inner wall of the matching hole, and an external thread is formed on the outer wall of the plug-in shaft. The plug-in shaft is threadedly connected to the matching hole so that the plug-in shaft tightly presses against the limiting groove. At the same time, if the support shaft and the clamping piece slip after long-term use, the plug-in shaft can be removed from the matching hole, and the relative positions of the support shaft and the clamping piece can be repositioned so that the support shaft can be effectively linked with the bearing again. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0029] Figure 1 It is a structural schematic diagram of a rice transplanter film covering device according to some embodiments of the present application;

[0030] Figure 2 It is a schematic diagram of the exploded structure of the film covering device of the rice transplanter according to some embodiments of the present application;

[0031] Figure 3 for Figure 2The enlarged structural diagram of the explosion structure of the film covering device of the rice transplanter shown in FIG.

[0032] Figure 4 Schematic diagram of the top shaft structure of the film covering device of the rice transplanter according to some embodiments of the present application;

[0033] Figure 5 It is a partial structural schematic diagram of a rice transplanter film covering device in an open cover state according to some embodiments of the present application;

[0034] Figure 6 This is a schematic structural diagram of a rice transplanter film covering device according to some embodiments of the present application in a state where a cover plate is opened;

[0035] Figure 7 for Figure 2 The enlarged structural diagram of the explosion structure of the film covering device of the rice transplanter shown in FIG.

[0036] Figure 8 for Figure 7 The schematic diagram of the partial structure of the film covering device of the rice transplanter shown;

[0037] Fig. 9 It is a structural schematic diagram of a rice transplanter film covering device according to some embodiments of the present application;

[0038] Fig.10 It is a partial structural schematic diagram of a rice transplanter film covering device in an open cover state according to some embodiments of the present application;

[0039] Fig.11 It is a structural schematic diagram of a rice transplanter film covering device according to some embodiments of the present application;

[0040] Description of labels:

[0041] 100, base plate; 110, first connecting plate; 111, notch; 120, second connecting plate; 130, guard plate;

[0042] 200, support shaft; 210, matching hole; 211, plug shaft;

[0043] 300, top shaft; 310, rod; 320, cone;

[0044] 400, cover plate; 410, first bearing; 420, operating member; 421, hook; 430, first loading part; 440, flange;

[0045] 500, tightening member; 510, limiting groove; 511, inserting shaft; 520, clamping table; 530, clamping groove; 540, clamping ring;

[0046] 600, fixing plate; 610, second bearing; 620, second loading part;

[0047] 700. Lamination roller. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0050] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. Moreover, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to express other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances.

[0051] like Figure 1 As shown, the present application provides a rice transplanter covering device for covering a field with ground film, the rice transplanter covering device comprises a base plate 100 for connecting to a frame, wherein the frame may be a part of a transplanting part of the rice transplanter, and the base plate 100 may be composed of a plurality of separate components.

[0052] like Figure 1 , Figure 2 As shown, the rice transplanter film covering device also includes a support shaft 200, a top shaft 300, a cover plate 400, a top tightening member 500 and a fixing plate 600. The support shaft 200 is used to install the ground film roll. When the ground film roll is exhausted, the user can remove the ground film roll from the support shaft 200 to replenish a new ground film roll.

[0053] As an optional solution, the support shaft 200 can be connected to other mechanical components to remove the film; as another optional solution, the support shaft 200 may not be connected to other mechanical components. Before use, the user pulls out the ground film, fits it to the field, and uses the friction of the field surface and the tension of the water to remove the film.

[0054] like Figure 2 , Figure 3 As shown, one end of the support shaft 200 is supported by the top shaft 300, a portion of the top shaft 300 passes through the cover plate 400, and a first bearing 410 is provided between the top shaft 300 and the cover plate 400, so that the support shaft 200 can rotate relative to the cover plate 400 through the first bearing 410. Specifically, as Figure 4 As shown, the top shaft 300 includes a rod portion 310 and a cone portion 320 that are connected to each other. The rod portion 310 of the top shaft 300 passes through the cover plate 400, and the cone portion 320 is located at the end of the rod portion 310. The rod portion 310 is fitted with a first bearing 410. The cone portion 320 is used to support the support shaft 200, and a partial area of ​​the cone portion 320 can be inserted into the interior of the support shaft 200.

[0055] like Figure 5 , Figure 6 As shown, one side of the cover plate 400 is hinged to the base plate 100, and the cover plate 400 is movably connected with an operating member 420, which can fasten the cover plate 400 and the base plate 100. When the operating member 420 is separated from the base plate 100, the cover plate 400 can rotate toward the side away from the support shaft 200, so that the top shaft 300 is synchronously away from the support shaft 200. One end of the support shaft 200 is open, and the user can remove or install the ground film roll from this end.

[0056] like Figure 2 , Figure 7 As shown, the other end of the support shaft 200 is fixed to the tightening member 500, and part of the tightening member 500 passes through the fixing plate 600. The fixing plate 600 is fixedly connected to the base plate 100, and a second bearing 610 is arranged between the tightening member 500 and the fixing plate 600, so that the support shaft 200 can rotate relative to the fixing plate 600 through the second bearing 610.

[0057] like Figure 7 As shown, the support shaft 200 is detachably connected to the tightening member 500, so that the support shaft 200 can slide relative to the tightening member 500 to change the relative distance between the support shaft 200 and the tightening member 500, so that the two ends of the support shaft 200 are firmly limited by the cover plate 400 and the support plate, and the two ends of the support shaft 200 are tightened. Under the action of the bearing, the support shaft 200 has a greater resistance when rotating to tighten the ground film.

[0058] In this way, near the fixed plate 600, the user can change the relative position of the top tightening member 500 and the support shaft 200, which can not only effectively solve the problem of the installation accuracy of the support shaft 200, but also enable the support shaft 200 to output a tighter ground film. Moreover, the top tightening member 500 is located at the end of the support shaft 200 away from the cover plate 400, so that the structure at the cover plate 400 is further simplified and further lightweight. The user can easily adjust the operating member 420 to rotate the cover plate 400, so that the top shaft 300 on the cover plate 400 is directly separated from the support shaft 200, so as to quickly replace the ground film roll with simple operation. As a result, the layout of the components of the rice transplanter covering device is reasonable, and the overall structure is easy to repair and maintain, which is suitable for the working environment with more mud at the bottom of the rice transplanter and relatively harsh.

[0059] Among them, Figure 2 As shown, the first bearing 410 and the second bearing 610 can be respectively composed of a plurality of bearings, so as to increase the force bearing area of ​​the top shaft 300 or the top fastening member 500 and further improve the stability of the film discharge.

[0060] As a specific implementation method, Figure 8 As shown, the pressing member 500 is rod-shaped, and a limiting groove 510 is formed on its axial surface. The supporting shaft 200 is formed with a matching hole 210, and the pressing member 500 is inserted into the supporting shaft 200 so that the matching hole 210 is opposite to the limiting groove 510. The matching hole 210 is fixed relative to the limiting groove by the insertion shaft 211, and the insertion shaft 211 is inserted into the matching hole 210 and supports the bottom surface of the limiting groove 510. The length of the limiting groove 510 along the axial direction of the supporting shaft 200 is L1, and the length of the matching hole 210 along the axial direction of the supporting shaft 200 is L2, and L1>L2. The length difference between L1 and L2 can provide adjustment space for the position between the supporting shaft 200 and the pressing member 500.

[0061] The above solution is more stable, especially compared with the spring-tightening solution, which is beneficial to the balance of the overall output of the ground film, avoids the unilateral floating of the ground film, is easier to clean when facing mud splashing interference, and has a long service life.

[0062] More specifically, Figure 8 As shown, the length of the limiting groove 510 along the axial direction of the support shaft 200 is L1, and the length of the matching hole 210 along the axial direction of the support shaft 200 is L2, L1>3L2, and the adjustment space is further increased to adapt to more rice transplanter models.

[0063] Specifically, if Figure 8As shown, the outer periphery of the clamping member 500 is provided with a clamping platform 520 protruding outward, and the end face of the clamping platform 520 is against the second bearing 610. The clamping member 500 is formed with a clamping groove 530 on the side of the second bearing 610 away from the clamping platform 520. A clamping ring 540 is installed in the clamping groove 530. The clamping ring 540 cooperates with the clamping platform 520 to prevent the second bearing 610 from axial movement.

[0064] Furthermore, similar card platform or card slot structures may also be provided in the cover plate 400 and the fixing plate 600 to further support the first bearing 410 or the second bearing 610 , which will not be described in detail in this embodiment.

[0065] As an alternative, Fig. 9 As shown, the inner wall of the matching hole 210 is formed with an internal thread, and the outer wall of the plug-in shaft 211 is formed with an external thread. The plug-in shaft 211 is threadedly connected to the matching hole 210, so that the plug-in shaft 211 tightly presses against the limiting groove 510. At the same time, if the support shaft 200 and the tightening member 500 slip after long-term use, the plug-in shaft 211 can be removed from the matching hole 210, and the relative positions of the support shaft 200 and the tightening member 500 can be repositioned so that the support shaft 200 can be effectively linked with the bearing again.

[0066] This embodiment also provides a detailed solution of a base plate 100, the base plate 100 includes a first connecting plate 110 and a second connecting plate 120, the cover plate 400 is hinged to the first connecting plate 110, and the fixed plate 600 is fixedly connected to the second connecting plate 120. The fixed plate 600 and the second connecting plate 120 can also be directly integrally formed, and the fixed plate 600 is regarded as the second connecting plate 120.

[0067] Preferably, Fig.10 As shown, the operating member 420 is configured as a rod, the middle portion of the operating member 420 is rotatably connected to the side of the cover plate 400, a hook portion 421 is formed at one end of the operating rod, and a notch 111 is formed at the side of the first connecting plate 110, and when the operating rod is rotated, the hook portion 421 can enter or escape from the notch 111. When the user opens the side cover, he only needs to rotate the operating member 420, and does not need to remove screws and other parts, which greatly improves the working efficiency.

[0068] Specifically, the rod-shaped operating member 420 may be assembled from a plurality of rods, or the entire operating member 420 may be formed in one piece.

[0069] Further, such as Fig. 9As shown, the base plate 100 also includes a semi-cylindrical protective plate 130, and the support shaft 200 is located inside the protective plate 130. The protective plate 130 can play a certain protective role on the support shaft 200 and the ground film roll on the support shaft 200. The two sides of the protective plate 130 are respectively connected to the first connecting plate 110 and the second connecting plate 120, and the cover plate 400 and the fixing plate 600 can close at least part of the two end surfaces of the protective plate 130.

[0070] Preferably, refer to Figure 3 , 7 As shown, the cover plate 400 is connected to a cylindrical first loading part 430, the fixing plate 600 is connected to a cylindrical second loading part 620, the first bearing 410 is located in the first loading part 430 and can rotate relative to the first loading part 430, and the second bearing 610 is located in the second loading part 620 and can rotate relative to the second loading part 620. The cylindrical first loading part 430 and the second loading part 620 can be adapted to the shapes of the first bearing 410 and the second bearing 610, so that the other parts of the cover plate 400 and the fixing plate 600 are always in the shape of a thin plate, thereby maintaining a lightweight design.

[0071] Optionally, only the cover plate 400 may be connected to the cylindrical first loading portion 430 , and the fixing plate 600 is not specifically limited, so that the user can easily rotate the cover plate 400 .

[0072] Specifically, Figure 3 As shown, one side of the cover plate 400 is folded to form a flange 440 , and the first loading portion 430 is located on the flange 440 , so that the cover plate 400 provides a stable supporting force for the first loading portion 430 .

[0073] As a specific solution, this embodiment further provides a rice transplanter, including the rice transplanter film covering device in the above solution. The base plate 100 is connected to the frame, and the rice transplanter film covering device also includes a film pressing roller 700, which is connected to the base plate 100, and the support shaft 200 is used to output ground film to the film pressing roller 700.

[0074] In this application, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0075] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rice transplanter film covering device, comprising a base plate for connecting to a rice transplanter frame, characterized in that: Also includes: Support shaft, cover plate, fixing plate, jacking shaft and jacking member; One end of the support shaft is supported by the top shaft, a portion of the top shaft passes through the cover plate, and a first bearing is provided between the top shaft and the cover plate, so that the support shaft can rotate relative to the cover plate through the first bearing; One side of the cover plate is hinged to the base plate, and the cover plate is movably connected with a manipulation member, and the manipulation member can fasten the cover plate and the base plate, and when the manipulation member is separated from the base plate, the cover plate can rotate toward a side away from the support shaft, so that the top shaft is synchronously away from the support shaft; The other end of the support shaft is fixed to the pressing member, a portion of the pressing member passes through the fixing plate, the fixing plate is fixedly connected to the base plate, and a second bearing is provided between the pressing member and the fixing plate, so that the support shaft can rotate relative to the fixing plate through the second bearing; The support shaft is detachably connected to the pressing member, so that the support shaft can slide relative to the pressing member to change the relative distance between the support shaft and the pressing member.

2. A rice transplanter film covering device according to claim 1, characterized in that: The clamping member is rod-shaped, and a limiting groove is formed on its axial surface. The supporting shaft is formed with a matching hole. The clamping member is inserted into the supporting shaft so that the matching hole is opposite to the limiting groove. The matching hole is fixed in relative position with the limiting groove by an inserted shaft. The inserted shaft is inserted into the matching hole and supports the bottom surface of the limiting groove. The length of the limiting groove along the axial direction of the supporting shaft is L1, and the length of the matching hole along the axial direction of the supporting shaft is L2, and L1>L2.

3. A rice transplanter film covering device according to claim 2, characterized in that: The length of the limiting groove along the axial direction of the support shaft is L1, the length of the matching hole along the axial direction of the support shaft is L2, and L1>3L2.

4. A rice transplanter film covering device according to claim 2, characterized in that: The outer periphery of the clamping member is provided with an outwardly protruding clamping platform, the end surface of the clamping platform abuts against the second bearing, and the clamping member is formed with a clamping groove on the side of the second bearing away from the clamping platform, and a clamping ring is installed in the clamping groove to prevent the second bearing from axial movement.

5. The film covering device for a rice transplanter according to claim 2, characterized in that: An inner wall of the matching hole is formed with an internal thread, and an outer wall of the insertion shaft is formed with an external thread.

6. A rice transplanter film covering device according to claim 1, characterized in that: The base plate includes a first connecting plate and a second connecting plate, the cover plate is hinged to the first connecting plate, and the fixing plate is fixedly connected to the second connecting plate.

7. A rice transplanter film covering device according to claim 6, characterized in that: The operating member is constructed in a rod shape, the middle part of the operating member is rotatably connected to the side of the cover plate, a hook is formed at one end of the operating rod, and a notch is formed on the side of the first connecting plate. When the operating rod rotates, the hook can enter or escape from the notch.

8. The film covering device for a rice transplanter according to claim 6, characterized in that: The base plate further comprises a semi-cylindrical guard plate, the support shaft is located inside the guard plate, and two sides of the guard plate are respectively connected to the first connecting plate and the second connecting plate.

9. A rice transplanter film covering device according to any one of claims 1 to 8, characterized in that: The cover plate is connected to a cylindrical first loading part, the fixing plate is connected to a cylindrical second loading part, the first bearing is located in the first loading part and can rotate relative to the first loading part, and the second bearing is located in the second loading part and can rotate relative to the second loading part.

10. A rice transplanter, characterized in that: The film covering device for a rice transplanter comprises any one of claims 1 to 9; wherein the base plate is connected to the frame; The film covering device of the rice transplanter also includes a film pressing roller; the film pressing roller is connected to the base plate, and the support shaft is used to output the ground film to the film pressing roller.

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