Tensioning mechanism and rice transplanter

Abstract

The utility model relates to the technical field of rice transplanters, in particular to a tensioning mechanism and a rice transplanter, which comprise a tensioning arm structure, a rotating seat, a support shaft, a sleeve, an adjusting rod and a spring, the tensioning arm structure comprises a tensioning arm, a rotating seat is arranged on the tensioning arm, a through hole is formed in one end of the supporting shaft, the other end of the supporting shaft is installed in the sleeve, and the rotating direction of the rotating seat is consistent with that of the supporting shaft; an included angle is formed between the axis of the penetrating hole and the axis of the supporting shaft, one end of the adjusting rod penetrates through the penetrating hole, and a locking assembly used for locking the adjusting rod and the supporting shaft is arranged on the adjusting rod and / or the supporting shaft. A positioning sleeve is arranged on the rotating seat, the other end of the adjusting rod is installed in the positioning sleeve, and the spring is arranged on the adjusting rod in a sleeving mode and located between the positioning sleeve and the supporting shaft. The coaxiality between the spring and the adjusting rod can be improved, and the situation that the spring is twisted and falls off or fractures is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of rice transplanters, in particular to a tensioning mechanism and a rice transplanter. Background Art

[0002] The existing rice transplanter engine flywheel is generally connected to the HST (integrated hydraulic transmission device) by belt drive, and is tensioned by a swing tensioner. Due to poor consistency of engine position or inconsistent elongation of the V-belt (drive belt), the bending degree of the V-belt after tensioning is inconsistent, resulting in poor coaxiality between the adjustment rod and the spring, twisting of the spring and the adjustment rod, and the spring coming out of the upper end positioning pin or the spring breaking, and power transmission interruption. Utility Model Content

[0003] The utility model aims to provide a tensioning mechanism, which can improve the coaxiality between a spring and an adjusting rod, and prevent the spring from twisting, falling off or breaking.

[0004] Another object of the utility model is to provide a rice transplanter, which can tension the transmission belt through a tensioning mechanism, and the tensioning mechanism can improve the coaxiality between the spring and the adjusting rod to prevent the spring from twisting and falling off or breaking.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A tensioning mechanism comprises a tensioning arm structure, a rotating seat, a supporting shaft, a sleeve, an adjusting rod and a spring;

[0007] The tensioning arm structure comprises a tensioning arm, the rotating seat is arranged on the tensioning arm, one end of the support shaft is provided with a through hole, and the other end is installed in the sleeve, and the rotating seat and the support shaft have the same rotation direction;

[0008] An angle is formed between the axis of the through hole and the axis of the support shaft, one end of the adjusting rod is passed through the through hole, and a locking assembly for locking the adjusting rod and the support shaft is provided on the adjusting rod and / or the support shaft;

[0009] A positioning sleeve is arranged on the rotating seat, the other end of the adjusting rod is installed in the positioning sleeve, and the spring is sleeved on the adjusting rod and is located between the positioning sleeve and the supporting shaft.

[0010] Furthermore, the tensioning arm structure includes a tensioning arm, a tensioning arm support seat and a tensioning wheel assembly, one end of the tensioning arm is rotatably mounted on the tensioning arm support seat, and the other end is mounted on the tensioning wheel assembly, the rotating seat is arranged on one end of the tensioning arm close to the tensioning wheel assembly, the rotating seat is rotatably connected to the tensioning arm via a first rotating shaft, and an axial positioning component for axially positioning the rotating seat is arranged on the first rotating shaft.

[0011] Furthermore, a mounting hole for mounting the rotating seat is provided on the tensioning arm, and a fixing sleeve is fixedly arranged in the mounting hole;

[0012] The rotating seat includes a first rotating shaft and a positioning sleeve. The first rotating shaft is rotatably installed on the fixed sleeve. The positioning sleeve is arranged at one end of the first rotating shaft. The positioning sleeve exceeds the outer surface of the first rotating shaft in the radial direction of the first rotating shaft to form a positioning shoulder. An annular groove is arranged at the other end of the first rotating shaft, and an elastic retaining ring for the shaft is installed in the annular groove. The positioning sleeve and the elastic retaining ring for the shaft respectively block the two sides of the fixed sleeve to form the axial positioning assembly.

[0013] Further, the tensioning arm support seat is fixedly arranged at one end of the rotating rod, and a rotating sleeve is fixedly arranged on the tensioning arm;

[0014] The tensioning arm is rotatably mounted on the rotating rod through the rotating sleeve, and a retaining ring and a clamping bolt are sequentially mounted on the open end of the other end of the rotating rod. A threaded hole is provided at the end of the rotating rod, and the clamping bolt is connected to the rotating rod through threads. The clamping bolt and the retaining ring jointly prevent the rotating sleeve from falling off from the open end of the rotating rod.

[0015] Furthermore, the threaded hole is arranged at the end of the rotating rod and is coaxial with the rotating rod.

[0016] Further, the axis of the through hole is perpendicular to the axis of the support shaft;

[0017] The locking assembly includes two locking pieces, which are locking nuts. The adjusting rod is provided with an external thread matching the locking nut. The locking nut is connected to the adjusting rod through threads, and the two locking nuts are respectively located at two ends of the perforation.

[0018] Furthermore, a lubricating oil nozzle is provided on the support shaft, and the lubricating oil nozzle can provide lubricating oil for the rotation of the support shaft.

[0019] Furthermore, the tensioning arm support seat is provided with a plurality of connecting bolts for connecting to the engine base.

[0020] Furthermore, the tensioning wheel assembly includes a tensioning wheel and a second rotating shaft, the second rotating shaft is fixedly arranged at the central axis of the tensioning wheel, and the tensioning wheel is rotatably connected to the tensioning arm through the second rotating shaft.

[0021] A rice transplanter comprises the tensioning mechanism, a frame, an engine and an integral hydraulic transmission device, wherein the flywheel of the engine is connected to the integral hydraulic transmission device for transmission via a transmission belt, one end of the tensioning arm is mounted on the base of the engine via a tensioning arm support seat, one end of the tensioning arm tensions the transmission belt via a tensioning wheel assembly, and the sleeve is fixed to the frame.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The present application provides a tensioning mechanism, one end of the tensioning arm is used to be fixedly connected to the engine base, the other end of the tensioning arm is used to tension the transmission belt, one end of the adjusting rod is locked to the supporting shaft, since the supporting shaft can rotate in the sleeve (during actual assembly, the sleeve is fixed to the frame of the rice transplanter), the other end of the adjusting rod is installed on the rotating seat and can rotate, and the spring is sleeved on the adjusting rod, so both ends of the adjusting rod can rotate and the rotation direction is consistent, ensuring that the spring and the adjusting rod are always coaxial, then compared with the prior art, the coaxiality between the spring and the adjusting rod can be improved, and in the actual tensioning process, the spring can be prevented from twisting and falling off or breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a front view of the tensioning mechanism of the utility model;

[0026] Figure 2 It is a side view of the tensioning mechanism of the utility model;

[0027] Figure 3 For this utility model Figure 1 Sectional view at AA in the middle;

[0028] Figure 4 For this utility model Figure 3 A partial enlarged view of the structure at center A;

[0029] Figure 5 For this utility model Figure 3 A partial enlarged view of the structure at point B in the middle.

[0030] In the figure:

[0031] 1-tensioning arm support seat; 2-tensioning arm; 201-fixed sleeve; 202-rotating sleeve;

[0032] 3-Tighten the bolts;

[0033] 4-locking nut; 5-elastic retaining ring for shaft; 6-lubricating nozzle;

[0034] 7-spring; 8-retaining ring; 9-transmission belt;

[0035] 10-tensioning wheel assembly; 11-nylon washer;

[0036] 12-adjusting rod; 13-supporting shaft;

[0037] 14-rotating seat; 1402-first rotating shaft; 1403-positioning sleeve;

[0038] 15-connecting bolt; 16-sleeve. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] Example 1

[0047] Reference Figure 1-Figure 5 This embodiment provides a tensioning mechanism, including a tensioning arm structure, a rotating seat 14, a support shaft 13, a sleeve 16, an adjusting rod 12 and a spring 7.

[0048] The tensioning arm structure includes a tensioning arm 2, on which the rotating seat 14 is arranged. One end of the support shaft 13 is provided with a through hole, and the other end is located in the sleeve 16. The support shaft 13 can rotate in the sleeve 16, and the rotating seat 14 rotates in the same direction as the support shaft 13.

[0049] Specifically, the tensioning arm structure includes a tensioning arm 2, a tensioning arm support seat 1 and a tensioning wheel assembly 10. One end of the tensioning arm 2 is rotatably mounted on the tensioning arm support seat 1, and the other end is mounted on the tensioning wheel assembly 10. The rotating seat 14 is arranged on one end of the tensioning arm 2 close to the tensioning wheel assembly 10. The rotating seat 14 is rotatably connected to the tensioning arm 2 via a first rotating shaft 1402, and an axial positioning component for axially positioning the rotating seat 14 is arranged on the first rotating shaft 1402.

[0050] One end of the tensioning arm 2 is rotatably mounted on the tensioning arm support seat 1, and the other end is mounted with the rotatable tensioning wheel assembly 10. The tensioning arm 2 and the tensioning arm support seat 1 rotate relative to each other, and the tensioning arm 2 and the tensioning wheel assembly rotate relative to each other.

[0051] The tensioning arm support base 1 is mainly used to connect the tensioning arm 2 and be installed on the engine base, that is, the tensioning arm 2 is rotatably connected to the tensioning arm support base 1, and the tensioning arm support base 1 is fixedly installed on the engine base.

[0052] Specifically, the tension arm support base 1 is provided with a plurality of connecting bolts 15 for connecting to the engine base. Preferably, bolt holes for installing the connecting bolts 15 are respectively provided at the four corners of the tension arm support base 1, and a connecting bolt 15 is installed in each bolt hole.

[0053] Specifically, the tension arm support seat 1 is fixedly arranged on one end of the rotating rod so that the end of the rotating rod forms a closed end, and the other end of the rotating rod is an open end, and the axis of the rotating rod is colinear with the center line of the tension arm support seat 1, and the rotating sleeve 202 is fixedly arranged on the tension arm 2. A through hole is arranged on the tension arm 2, and the rotating sleeve 202 is fixedly installed in the through hole on the tension arm 2. The tension arm 2 is rotatably installed on the rotating rod through the rotating sleeve 202, that is, the tension arm support seat 1 is rotatably connected with the tension arm 2 through the rotating rod, and one end of the rotating rod forms a closed end due to the blocking effect of the tension arm support seat 1, and the retaining ring 8 and the clamping bolt 3 are sequentially installed on the open end of the other end of the rotating rod, and a threaded hole is arranged at the end of the rotating rod, and the clamping bolt 3 is installed in the threaded hole and is threadedly connected with the rotating rod, and the clamping bolt 3 and the retaining ring 8 jointly prevent the rotating sleeve 202 from falling off from the open end of the rotating rod, thereby preventing the tension arm 2 from falling off from the rotating rod.

[0054] Preferably, the rotation directions of the rotating rod, the rotating seat 14 and the supporting shaft 13 are consistent.

[0055] Preferably, the threaded hole is arranged at the end of the rotating rod and is coaxial with the rotating rod, that is, the clamping bolt 3 is arranged at the end of the open end of the rotating rod and prevents the retaining ring 8, the rotating sleeve 202 and the tensioning arm 2 from falling off through the blocking effect of its screw head.

[0056] The tension arm 2 has a mounting hole at one end near the tension wheel assembly 10, and a fixed sleeve 201 is fixedly mounted in the mounting hole. The rotating seat 14 is mounted in the fixed sleeve 201, and the rotating seat 14 is rotatably connected to the fixed sleeve 201 of the tension arm 2 via a first rotating shaft 1402, and an axial positioning component for axially positioning the rotating seat 14 is provided on the first rotating shaft 1402, and the axial positioning component can position the axis of the rotating seat 14.

[0057] Specifically, the rotating seat 14 includes a first rotating shaft 1402 and a positioning sleeve 1403 (such as Figure 4 ), the fixed sleeve 201 is fixedly installed in the mounting hole, the first rotating shaft 1402 is rotatably installed in the fixed sleeve 201, the positioning sleeve 1403 is arranged at one end of the first rotating shaft 1402, the positioning sleeve 1403 exceeds the outer surface of the first rotating shaft 1402 in the radial direction of the first rotating shaft 1402 to form a positioning shoulder, the other end of the first rotating shaft 1402 is provided with an annular groove, and the shaft elastic retaining ring 5 is installed in the annular groove, the positioning sleeve 1403 and the shaft elastic retaining ring 5 are respectively located on both sides of the fixed sleeve 201, and respectively block the two sides of the fixed sleeve 201 to form the axial positioning assembly, and the fixed sleeve 201 is fixed in the mounting hole, so the axial positioning of the first rotating shaft 1402 is realized by the positioning sleeve 1403 and the shaft elastic retaining ring 5 (i.e., the axial positioning assembly), so as to realize the axial positioning of the rotating seat 14.

[0058] The tensioning arm 2 comprises a fixed sleeve 201 and a rotating sleeve 202 , and preferably, the fixed sleeve 201 and the rotating sleeve 202 are respectively fixed to the tensioning arm body by welding.

[0059] In this embodiment, if Figure 4 The positioning sleeve 1403 and the first rotating shaft 1402 are an integrally formed structure. The positioning sleeve 1403 exceeds the outer surface of the first rotating shaft 1402 in the radial direction of the first rotating shaft 1402 to form a positioning shoulder. The outermost side of the positioning sleeve 1403 in the radial direction, that is, the position on the positioning sleeve 1403 when the axis of the first rotating shaft 1402 can produce the maximum distance H1 in the radial direction, the radius of the first rotating shaft 1402 is R1, and the radius of the mounting hole is R2, satisfying R2≥H1>R1, that is, the maximum size of the positioning sleeve 1403 in the radial direction does not exceed the diameter of the mounting hole, so that the rotating seat 14 as a whole can pass through the mounting hole.

[0060] like Figure 4A blocking portion may also be provided at one end of the fixing sleeve 201, and the radius of the blocking portion is R3, satisfying R3>R2, so that after the fixing sleeve 201 is installed in the installation hole, the blocking portion is in contact with the side surface of the tensioning arm 2 to form a blocking effect. The blocking portion may be provided with a plurality of connecting bolts 15 along the axial direction, and the fixing sleeve 201 may be bolted to the tensioning arm 2 through the plurality of connecting bolts 15.

[0061] In this embodiment, a nylon washer 11 is further disposed on the first rotating shaft 1402 , and the nylon washer 11 is disposed between the blocking portion of the fixing sleeve 201 and the shaft elastic retaining ring 5 .

[0062] The support shaft 13 has one end provided with the through hole, and the other end installed in the sleeve 16. When the tensioning mechanism is actually installed on the rice transplanter, the sleeve 16 is fixed to the frame of the rice transplanter. Preferably, the axis of the through hole is perpendicular to the axis of the support shaft 13, one end of the adjusting rod 12 is passed through the through hole, and the adjusting rod 12 and the support shaft 13 are locked and fixed by a locking assembly. Specifically, the locking assembly includes two locking members, and locking members for locking the adjusting rod 12 are respectively arranged on the adjusting rod 12 and at the two ends of the through hole.

[0063] Specifically, the locking piece is a locking nut 4, and the adjusting rod 12 is provided with an external thread matching the locking nut 4. The locking nut 4 is connected to the adjusting rod 12 through a thread, and the support shaft 13 is located between the two locking nuts 4. The two locking nuts 4 are adjusted respectively and pressed against the support shaft 13 respectively, so that the locking and fixation between the adjusting rod 12 and the support shaft 13 is achieved.

[0064] The positioning sleeve 1403 is set on the rotating seat 14, one end of the adjusting rod 12 is locked and fixed to the supporting shaft 13, the other end of the adjusting rod 12 passes through the positioning sleeve 1403 and is installed in the positioning sleeve 1403, and the spring 7 is sleeved on the adjusting rod 12 and located between the positioning sleeve 1403 and the supporting shaft 13.

[0065] Preferably, the spring 7 is a compression spring.

[0066] In an optional implementation manner of this embodiment, the tensioning wheel assembly 10 includes a tensioning wheel and a second rotating shaft, the second rotating shaft is fixedly arranged at the central axis of the tensioning wheel, and the tensioning wheel is rotatably connected to the tensioning arm 2 via the second rotating shaft.

[0067] In an optional implementation manner of the present embodiment, a lubricating nozzle 6 is provided on the support shaft 13, and the lubricating nozzle 6 can provide lubricating oil for the rotation of the support shaft 13 to ensure lubrication between the support shaft 13 and the sleeve 16, thereby ensuring that the rotating seat 14 and the support shaft 13 can rotate flexibly following the rotation of the adjusting rod 12.

[0068] Note: If Figure 5 A positioning shoulder is provided on one end of the principle adjusting rod 12 on the support shaft 13, and the positioning shoulder is in contact with one side of the sleeve 16 to form a blocking effect. An annular groove is provided on the support shaft 13 and on the other side of the sleeve 16, and an elastic retaining ring 5 for the shaft is also installed in the annular groove. The axial positioning of the support shaft 13 is achieved by the positioning shoulder on the support shaft 13 and the elastic retaining ring 5 for the shaft.

[0069] Example 2

[0070] The present embodiment provides a rice transplanter, including the tensioning mechanism, and also includes a frame, an engine and an integrated hydraulic transmission device. The flywheel of the engine is connected to the integrated hydraulic transmission device through a transmission belt 9 (V-belt). The tensioning arm support seat 1 is installed on the base of the engine, the sleeve 16 is fixed to the frame, and the tensioning wheel assembly 10 is tensioned (pressed or tightened) on the transmission belt 9.

[0071] Compared with the traditional tensioning mechanism, the tensioning mechanism of the present application can rotate the rotating seat 14, the adjusting rod 12 and the support shaft 13 synchronously, and the spring 7 is mounted on the adjusting rod 12, so that the upper and lower ends of the spring 7 are coaxial, thereby improving the service life of the spring 7 and the adjusting rod 12, and can also adapt to the assembly reliability and effectiveness of the V-belt with different curvatures.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

[0073] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present invention and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0075] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tensioning mechanism, characterized in that: It comprises a tensioning arm structure, a rotating seat (14), a supporting shaft (13), a sleeve (16), an adjusting rod (12) and a spring (7); The tensioning arm structure comprises a tensioning arm (2), the rotating seat (14) is arranged on the tensioning arm (2), one end of the support shaft (13) is provided with a through hole, and the other end is installed in the sleeve (16), and the rotating seat (14) and the support shaft (13) rotate in the same direction; An angle is formed between the axis of the through hole and the axis of the support shaft (13); one end of the adjusting rod (12) is inserted into the through hole; and a locking assembly for locking the adjusting rod (12) and the support shaft (13) is provided on the adjusting rod (12) and / or the support shaft (13); A positioning sleeve (1403) is provided on the rotating seat (14), the other end of the adjusting rod (12) is installed in the positioning sleeve (1403), and the spring (7) is sleeved on the adjusting rod (12) and is located between the positioning sleeve (1403) and the supporting shaft (13).

2. The tensioning mechanism according to claim 1, characterized in that: The tensioning arm structure comprises a tensioning arm (2), a tensioning arm support seat (1) and a tensioning wheel assembly (10); one end of the tensioning arm (2) is rotatably mounted on the tensioning arm support seat (1), and the other end is mounted on the tensioning wheel assembly (10); the rotating seat (14) is arranged on one end of the tensioning arm (2) close to the tensioning wheel assembly (10); the rotating seat (14) is rotatably connected to the tensioning arm (2) via a first rotating shaft (1402), and an axial positioning component for axially positioning the rotating seat (14) is arranged on the first rotating shaft (1402).

3. The tensioning mechanism according to claim 2, characterized in that: The tensioning arm (2) is provided with a mounting hole for mounting the rotating seat (14), and a fixing sleeve (201) is fixedly arranged in the mounting hole; The rotating seat (14) comprises a first rotating shaft (1402) and a positioning sleeve (1403), wherein the first rotating shaft (1402) is rotatably mounted on the fixed sleeve (201), wherein the positioning sleeve (1403) is arranged at one end of the first rotating shaft (1402), wherein the positioning sleeve (1403) extends beyond the outer surface of the first rotating shaft (1402) in the radial direction of the first rotating shaft (1402) to form a positioning shoulder, wherein an annular groove is arranged at the other end of the first rotating shaft (1402), and an axial elastic retaining ring (5) is installed in the annular groove, wherein the positioning sleeve (1403) and the axial elastic retaining ring (5) respectively block the two sides of the fixed sleeve (201) to form the axial positioning assembly.

4. The tensioning mechanism according to claim 2, characterized in that: The tensioning arm support seat (1) is fixedly arranged at one end of the rotating rod, and a rotating sleeve (202) is fixedly arranged on the tensioning arm (2); The tensioning arm (2) is rotatably mounted on the rotating rod through the rotating sleeve (202), and a retaining ring (8) and a clamping bolt (3) are sequentially mounted on the open end of the other end of the rotating rod. A threaded hole is provided at the end of the rotating rod, and the clamping bolt (3) is connected to the rotating rod through a thread. The clamping bolt (3) and the retaining ring (8) jointly prevent the rotating sleeve (202) from falling off from the open end of the rotating rod.

5. The tensioning mechanism according to claim 4, characterized in that: The threaded hole is arranged at the end of the rotating rod and is coaxial with the rotating rod.

6. The tensioning mechanism according to claim 1, characterized in that: The axis of the through hole is perpendicular to the axis of the support shaft (13); The locking assembly comprises two locking members, wherein the locking members are locking nuts (4), the adjusting rod (12) is provided with an external thread matching the locking nut (4), the locking nut (4) is connected to the adjusting rod (12) by threads, and the two locking nuts (4) are respectively located at two ends of the through hole.

7. The tensioning mechanism according to claim 1, characterized in that: The support shaft (13) is provided with a lubricating oil nozzle (6), and the lubricating oil nozzle (6) can provide lubricating oil for the rotation of the support shaft (13).

8. The tensioning mechanism according to claim 2, characterized in that: The tension arm support seat (1) is provided with a plurality of connecting bolts (15) for connecting to an engine base.

9. The tensioning mechanism according to claim 2, characterized in that: The tension wheel assembly (10) comprises a tension wheel and a second rotating shaft, wherein the second rotating shaft is fixedly arranged at the central axis of the tension wheel, and the tension wheel is rotationally connected to the tension arm (2) via the second rotating shaft.

10. A rice transplanter, comprising a frame, an engine and an integrated hydraulic transmission device, characterized in that: Also includes a tensioning mechanism as described in any one of claims 1-9; The flywheel of the engine is connected to the integrated hydraulic transmission device through a transmission belt (9), one end of the tensioning arm (2) is installed on the base of the engine through a tensioning arm support seat (1), one end of the tensioning arm (2) tensions the transmission belt (9) through a tensioning wheel assembly, and the sleeve (16) is fixed to the frame.

Images