A paddy field grader and its side float deployment self-locking device

Abstract

A paddy field grader and its side float deployment self-locking device are disclosed. The paddy field grader includes a side float deployment self-locking device, which comprises: a self-locking mechanism including a connecting rod base, a side float support, a long arm, and a short arm. The connecting rod base is mounted on a main float, the side float support is mounted on the side float, one end of the side float support is hinged to the upper end of the connecting rod base, the lower end of the long arm is hinged to the connecting rod base, one end of the short arm is hinged to the side float support, and the other end of the short arm is hinged to the upper end of the long arm; and a power mechanism, mounted on the main float and connected to the upper end of the long arm and the other end of the short arm, for realizing the deployment and folding of the side float relative to the main float. This invention solves the problem of unevenness in paddy field surfaces caused by leveling, achieves fine leveling of paddy field soil, and is flexible and convenient to use.

Description

Technical Field

[0001] This invention relates to agricultural machinery, and more particularly to a paddy field leveler and its side float deployment self-locking device. Background Technology

[0002] Precise leveling of paddy fields is an important agronomic requirement in rice production and an inevitable choice as agriculture enters the stage of large-scale operation. It not only helps reduce the consumption of irrigation water resources, reduce fertilizer loss, and improve fertilizer efficiency, but also helps to ensure the even distribution and efficacy of pesticides, reduce pests and diseases, and increase rice yield.

[0003] Most land leveling implements currently in use are mounted at the rear of agricultural tractors. The control precision of the large land leveling shovel is affected by factors such as the tractor's traction speed, the undulation of the ground, and the control response speed. When the ground is uneven or the tractor vibrates significantly, potholes and bumps may appear on the paddy field. The rear float device can solve the above problems by filling the excess soil in the paddy field into the potholes. However, the working width of the float needs to be greater than the width of the land leveler itself. For ease of transportation and storage, the rear float needs to be divided into a main float and a side float. The side float should be able to open and close automatically and have a self-locking function. Existing technology lacks a device that can realize the self-locking function of the side float in paddy field leveling operations. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies of the prior art by providing a paddy field grader and its side float deployment self-locking device.

[0005] To achieve the above objectives, the present invention provides a side float deployment self-locking device for a paddy field grader, comprising:

[0006] A self-locking mechanism includes a connecting rod base, a side float plate support, a long arm, and a short arm. The connecting rod base is mounted on the main float plate, and the side float plate support is mounted on the side float plate. One end of the side float plate support is hinged to the upper end of the connecting rod base, the lower end of the long arm is hinged to the connecting rod base, one end of the short arm is hinged to the side float plate support, and the other end of the short arm is hinged to the upper end of the long arm.

[0007] The power mechanism is installed on the main float and connected to the upper end of the long boom and the other end of the short boom, and is used to realize the unfolding and folding of the side float relative to the main float.

[0008] The aforementioned paddy field leveler's side float deployment self-locking device includes two long booms symmetrically installed on both sides of the connecting rod base. Each end of the long boom has a connecting hole, and one side of the long boom has a boss corresponding to the connecting hole. The connecting hole at the lower end of the long boom is coaxially engaged with the lower hole of the connecting rod base through a first connecting rod shaft, and the end face of the boss faces the connecting rod base.

[0009] The aforementioned paddy field leveler's side float deployment self-locking device includes a pair of symmetrically arranged ear plates on the short arm. The pair of ear plates are connected by a crossbeam. Each ear plate has an upper connecting hole and a lower connecting hole. The upper connecting hole is connected to the other end connecting hole of the two long arms through a second connecting rod shaft.

[0010] The aforementioned self-locking device for deploying the side float plate of the paddy field leveler includes a side float plate support comprising two symmetrically arranged side plates connected by a base plate. The protruding ends of the two side plates are respectively provided with first ear holes. The connecting rod base comprises two symmetrically arranged base plates, the top ends of the two base plates are respectively provided with upper holes. The side float plate support is connected to the connecting rod base through a third connecting rod shaft passing through the first ear holes and the upper holes.

[0011] The aforementioned paddy field leveler has a side float plate deployment self-locking device, wherein the lower connecting hole of the short arm is connected to the second ear hole of the two side plates through a fourth connecting rod shaft, and the two fourth connecting rod shafts pass through the second ear hole and the lower connecting hole from the outside of the two side plates respectively.

[0012] The aforementioned paddy field grader's side float deployment self-locking device includes a protrusion on the short boom, a stop block on the side float support, the protrusion on the crossbeam, and the stop block located between the two side plates and corresponding to the protrusion.

[0013] The aforementioned paddy field leveler's side float deployment self-locking device includes a power mechanism comprising a cylinder mounting base and a hydraulic telescopic cylinder. The cylinder mounting base is mounted on the main float, and the hydraulic cylinder seat of the hydraulic telescopic cylinder is mounted on the cylinder mounting base. The top end of the hydraulic push rod of the hydraulic telescopic cylinder is connected to the second connecting rod shaft.

[0014] The aforementioned paddy field grader's side float deployment self-locking device involves a hydraulic push rod that drives a second connecting rod shaft. This second connecting rod shaft causes the long boom, short boom, and side float support to rotate around the first connecting rod shaft, the fourth connecting rod shaft, and the third connecting rod shaft, respectively, until the protrusion of the short boom contacts the stop block. At this point, the hydraulic telescopic cylinder stops operating, and the side float deploys and is positioned on the same plane as the main float.

[0015] In the aforementioned paddy field grader's side float deployment self-locking device, when the side float is deployed, the hole spacing L2 of the side float support is parallel to the plane of the main float, and L2 = L 1-2 L3+L 1-1 = L4 + α, 1 ≤ α ≤ 5, the angle θ between the lines connecting the hole spacing L3 of the short arm and the hole spacing L4 of the long arm satisfies: 2° < θ < 7°, where L 1-1 Let L1 be the component of the hole spacing L1 of the connecting rod base in the direction parallel to the main float plate. 1-2 Let L1 be the component of the hole spacing L1 of the connecting rod base in the direction perpendicular to the main float plate.

[0016] To better achieve the above objectives, the present invention also provides a paddy field leveling machine, which includes the aforementioned side float deployment self-locking device.

[0017] The technical effects of this invention are as follows:

[0018] The side float deployment self-locking device of this invention can be installed at the rear of a tractor or grader to solve the problem of uneven paddy field surfaces caused by leveling, enabling fine leveling of paddy field soil, and is flexible and convenient to use. The side float opening and closing device adopts a four-bar self-locking mechanism, which realizes the opening and closing function of the side float through a hydraulic cylinder, effectively expanding the leveling operation area of ​​the float, and making turnover and transportation flexible and convenient, effectively realizing fine leveling of uneven paddy field surfaces and locally raised soil. The short boom has a boss structure, and the side float support is equipped with a stop block. When the side float is subjected to an upward force from the paddy field surface or other objects, the plane of the boss contacts the inclined surface of the stop block, which locks the short boom and the side float support together, thereby keeping the side float in the deployed state. The linkage structure size and the cylinder operating length are adapted. When the short boom rotates to coincide with the straight line of the long boom linkage, the short boom is subjected to a vertical force. The two forces are equal in magnitude and opposite in direction, preventing the short boom from rotating, thereby keeping the side float in the deployed state.

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0020] Figure 1 This is an isometric view of the side float plate according to an embodiment of the present invention;

[0021] Figure 2 This is a front view of a side float deployment self-locking device according to an embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional view of the side float plate in its self-locking deployed state according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the side float plate in the retracted state according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of a connecting rod base structure according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a side floating plate support structure according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of a short-arm connecting rod structure according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the installation of the connecting rod base and the side float support according to an embodiment of the present invention;

[0028] Figure 9 This is a cross-sectional view of the second connecting rod shaft installation according to an embodiment of the present invention;

[0029] Figure 10A , 10B This is a schematic diagram illustrating the self-locking principle of the side float plate in operation according to an embodiment of the present invention.

[0030] Among them, the markings in the figure

[0031] 1. Main Floating Plate

[0032] 2 Side floats

[0033] 3. Side float deployment self-locking device

[0034] 31 Self-locking mechanism

[0035] 311 Long boom

[0036] 312 Short boom

[0037] 3121 Earplate

[0038] 3122 Upper connection hole

[0039] 3123 Lower connecting hole

[0040] 3124 Crossbeam

[0041] 3125 convex platform

[0042] 313 Side float plate support

[0043] 3131 Side Panel

[0044] 3132 base plate

[0045] 3133 First Ear Hole

[0046] 3134 Second Ear Hole

[0047] 314 Connecting rod base

[0048] 3141 base plate

[0049] 3142 Upper hole

[0050] 3143 Lower hole

[0051] 315 stop block

[0052] 316 First connecting rod shaft

[0053] 317 Second Linkage Shaft

[0054] 318 Third Linkage Shaft

[0055] 319 Fourth Linkage Shaft

[0056] 32 Power mechanism

[0057] 321 Hydraulic Cylinder Mounting Mount

[0058] 322 Hydraulic Cylinder Mount

[0059] 323 Hydraulic push rod

[0060] 324 Hydraulic Cylinder Connecting Pin

[0061] L1 connecting rod base hole spacing

[0062] Hole spacing of L2 side float plate support

[0063] L3 short boom hole spacing

[0064] L4 long boom hole spacing

[0065] L 1-1 The component of the hole spacing L1 of the connecting rod base in the direction parallel to the main float plate

[0066] L 1-2 The component of the hole spacing L1 of the connecting rod base in the direction perpendicular to the main float plate Detailed Implementation

[0067] The structural and working principles of the present invention will be described in detail below with reference to the accompanying drawings:

[0068] The paddy field grader of the present invention includes a side float deployment self-locking device 3. This device is a key actuator for realizing the opening and closing function of the side float 2. It mainly utilizes connecting rods and pins to position and connect the main float 1 and the side float 2, and a hydraulic telescopic cylinder to realize the opening and closing function of the side float 2 relative to the main float 1. This side float deployment self-locking device 3 can also be attached together with the main float 1 and the side float 2 to tractor or other traction machinery for paddy field leveling. Since the composition, structure, relative positions, connections, and functions of other parts of the paddy field grader are all mature existing technologies, they will not be described in detail here. Only the side float deployment self-locking device 3 of the present invention will be described in detail below.

[0069] See Figures 1-4 , Figure 1 This is an unfolded isometric view of the side floating plate 2 according to an embodiment of the present invention. Figure 2 This is a front view of the side floating plate deployment self-locking device 3 according to an embodiment of the present invention. Figure 3 This is a cross-sectional view of the side float 2 in its self-locking state according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the retracted state of the side float 2 according to an embodiment of the present invention. The self-locking device 3 for deploying the side float includes a self-locking mechanism 31, comprising a connecting rod base 314, a side float support 313, a long arm 311, and a short arm 312. The connecting rod base 314 is mounted on the main float 1, and the side float support 313 is mounted on the side float 2. In this embodiment, the lower plane of the side float support 313 is welded to the side float 2; one end of the side float support 313 is hinged to the upper end of the connecting rod base 314. The lower end of the long arm 311 is hinged to the connecting rod base 314, one end of the short arm 312 is hinged to the side float support 313, and the other end of the short arm 312 is hinged to the upper end of the long arm 311; and the power mechanism 32 is installed on the main float 1 and connected to the upper end of the long arm 311 and the other end of the short arm 312, for realizing the unfolding and folding of the side float 2 relative to the main float 1.

[0070] The power mechanism 32 includes a cylinder mounting base 321 and a hydraulic telescopic cylinder. The cylinder mounting base 321 is mounted on the main float plate 1. The hydraulic cylinder seat 322 of the hydraulic telescopic cylinder is mounted on the cylinder mounting base 321. A spherical bearing is installed in the lower end hole of the hydraulic cylinder seat 322, and the bearing hole of the spherical bearing is coaxially installed with the hole in the cylinder mounting base 321. The hydraulic telescopic cylinder is connected and positioned to the main float plate 1 by a cylinder connecting pin 324. The top end of the hydraulic push rod 323 of the hydraulic telescopic cylinder is connected to the second connecting rod shaft 317.

[0071] See Figure 5 and Figure 6 , Figure 5This is a schematic diagram of the connecting rod base 314 according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the side float support 313 according to an embodiment of the present invention. The side float support 313 includes two symmetrically arranged side plates 3131, which are connected by a base plate 3132. The protruding ends of the side plates 3131 are respectively provided with first ear holes 3133. The connecting rod base 314 includes two symmetrically arranged base plates 3141, and the top ends of the two base plates 3141 are respectively provided with upper holes 3142. The side float support 313 is connected to the connecting rod base 314 through the first ear holes 3133 of the side plates 3131 and the upper holes 3142 of the two base plates 3141 via a third connecting rod shaft 318.

[0072] In this embodiment, two long arm rods 311 are symmetrically installed on both sides of the connecting rod base 314. Each end of the long arm rod 311 is provided with a connecting hole. A boss 3125 is provided on one side of the long arm rod 311 corresponding to the connecting hole. The connecting hole at one end of the long arm rod 311 is coaxially engaged with the lower hole 3143 of the connecting rod base 314 through the first connecting rod shaft 316, and the end face of the boss 3125 faces the connecting rod base 314.

[0073] See Figure 7 , Figure 7 This is a schematic diagram of a short arm 312 according to an embodiment of the present invention. The short arm 312 consists of a pair of symmetrically arranged ear plates 3121, which are connected by a crossbeam 3124. Each ear plate 3121 has an upper connecting hole 3122 and a lower connecting hole 3123. The upper connecting hole 3122 is connected to the upper connecting holes of the two long arms 311 on both sides via a second connecting rod shaft 317. The lower connecting hole 3123 of the short arm 312 is connected to the second ear holes 3134 of the two side plates 3131 via a fourth connecting rod shaft 319. The two fourth connecting rod shafts 319 pass through the outer sides of the two side plates 3131 and inwards, respectively, connecting the second ear holes 3134 and the lower connecting holes 3123 of the short arm 312. In this embodiment, the short arm 312 is provided with a boss 3125, and a corresponding stop block 315 is provided on the side float support 313. The boss 3125 is provided on the crossbeam 3124, and the stop block 315 is located between the two side plates 3131 and is provided corresponding to the boss 3125.

[0074] See Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the installation of the connecting rod base and the side float support according to an embodiment of the present invention. Figure 9This is a cross-sectional view of the second connecting rod shaft installation according to an embodiment of the present invention. In this embodiment, the connecting rod base 314 and the cylinder fixing seat 321 are welded to the main float plate 1, and the stop block 315 is welded to the side float plate support 313. The first ear holes 3133 of the two side plates 3131 of the side float plate support 313 are coaxial with the upper holes 3142 of the two base plates 3141 of the connecting rod base 314 and are installed symmetrically on both sides. The third connecting rod shaft 318 passes through the above-mentioned coaxial holes to radially position and install the holes of the side float plate support 313 and the connecting rod base 314. A nut or cotter pin is installed at the end of the third connecting rod shaft 318 to position the side float plate support 313 and the third connecting rod shaft 318 relative to each other on the connecting rod base 314. Figure 8 As shown. The first link shaft 316, the second link shaft 317 and the fourth link shaft 319 have the same or similar structure as the third link shaft 318.

[0075] Two long arms 311 are symmetrically installed on both sides of the connecting rod base 314. The connecting holes at the lower ends of the long arms 311 are coaxially fitted with the lower holes 3143 of the connecting rod base 314, and the end face of the boss 3125 faces the connecting rod base 314. After the first connecting rod shaft 316 is inserted into the coaxial holes, a nut or cotter pin is added to the end of the first connecting rod shaft 316 to position the two long arms 311 and the first connecting rod shaft 316 on the connecting rod base 314. Figure 9 As shown. The lower connecting hole 3123 of the short boom 312 is coaxial with the second ear hole 3134 of the side float support 313 and is installed symmetrically on both sides; the two fourth connecting rod shafts 319 are respectively inserted into the above coaxial holes from the outside to the inside, and nuts or cotter pins are added to the ends of the fourth connecting rod shafts 319 to connect the lower connecting hole 3123 of the short boom 312 with the second ear hole 3134 of the side float support 313. The upper connecting hole 3122 of the short boom 312 is coaxially fitted with the upper connecting holes of the two long booms 311 and the end hole of the hydraulic push rod 323, and the second connecting rod shaft 317 is inserted and a nut or cotter pin is added to its end to connect and position the upper connecting holes of the two long booms 311, the upper connecting hole 3122 of the short boom 312 and the end hole of the hydraulic push rod 323, as shown. Figure 9 As shown. The first connecting rod shaft 316, the second connecting rod shaft 317, the third connecting rod shaft 318, and the fourth connecting rod shaft 319 are all connected by clearance fit. After connection, the connecting rod base 314, the side float support 313, the long arm 311, and the short arm 312 can rotate relative to each other, thus forming a four-bar linkage. The relevant dimensions of each part are indicated as follows. Figure 4 As shown.

[0076] See Figure 10A , Figure 10B , Figure 10A , 10B This is a schematic diagram illustrating the self-locking principle of the side float 2 in its working state according to an embodiment of the present invention. Figure 10A The principle of self-locking when subjected to upward thrust from the ground. Figure 10B The mechanism utilizes a self-locking principle under the weight of the side float 2. When the hydraulic cylinder extends, the hydraulic push rod 323 pushes the second connecting rod shaft 317 to move. The second connecting rod shaft 317 drives the long arm 311, short arm 312, and side float support 313 to rotate around the first connecting rod shaft 316, the fourth connecting rod shaft 319, and the third connecting rod shaft 318, respectively, until the boss 3125 of the short arm 312 contacts the stop block 315 of the side float support 313. At this point, the hydraulic telescopic cylinder stops moving, and the side float 2 unfolds and is located on the same plane as the main float 1. When the side float 2 unfolds, the straight line of the connecting rod of the side float support 313, i.e., the hole spacing L2, is parallel to the plane of the main float 1, and L2 = L 1-2 L3+L 1-1 = L4 + α, 1 ≤ α ≤ 5, the angle θ between the line connecting the hole spacing L3 of the short arm 312 and the hole spacing L4 of the long arm 311 satisfies: 2° < θ < 7°, where L 1-1 Let L be the component of the hole spacing L1 of the connecting rod base 314 in the direction parallel to the main float 1. 1-2 Let L1 be the component of the hole spacing L1 of the connecting rod base 314 in the direction perpendicular to the main float 1.

[0077] In this state, if the side float 2 is subjected to an upward thrust F from the paddy field surface or other objects, this force will be transmitted to the short boom 312 through the side float support 313, the two fourth connecting rod shafts 319, and the stop block 315. The force state of the short boom 312 is as follows: Figure 10A As shown. Wherein: F1 - the side float support 313 exerts an upward force on the boss 3125 of the short arm 312 through the stop block 315; F2 - the side float support 313 exerts an upward force on the lower connecting hole 3123 of the short arm 312 through the fourth connecting rod shaft 319; F3 - the long arm 311 exerts a downward force on the upper connecting hole 3122 of the short arm 312 through the second connecting rod shaft 317. It can be seen that, assuming the short arm 312 rotates around the second connecting rod shaft 317, when F2 increases, F1 will also increase. Since the stop block 315 is a planar force, the short arm 312 will not rotate around the second connecting rod shaft 317. Similarly, it can be known that the short arm 312 will not rotate around the fourth connecting rod shaft 319. That is, when the side float 2 is subjected to an upward force from the paddy field ground or other objects, the force will be transmitted to the short arm 312 through the side float support 313, the two fourth link shafts 319 and the stop block 315 respectively. Since the fourth link shafts 319 and the stop block 315 simultaneously exert an upward force on the short arm 312, and the upper shaft of the short arm 312 is connected to the long arm 311 and is located between the two forces, the short arm 312 and the side float support 313 can be locked together.

[0078] When the side float 2 is subjected to gravity or a downward force applied from above, if the thrust of the hydraulic push rod 323 is less than the force applied by the external force F, the short boom 312 will rotate around the second connecting rod shaft 317. When the short boom 312 rotates to coincide with the straight line of the connecting rod of the long boom 311, if... Figure 10B As shown, the upper connecting hole 3122 of the short arm 312 is subjected to an upward force F3, and the lower connecting hole 3123 of the short arm 312 is subjected to a downward force F2. F3 and F2 are equal in magnitude but opposite in direction, and the arm will not continue to rotate. The forces acting on it are as follows: Figure 10B As shown. Based on the above force analysis, it can be seen that when the side float 2 is in the deployed position, regardless of the magnitude of the thrust of the hydraulic push rod 323, the mechanism can always maintain its deployed self-locking state. That is, it can maintain balance without the hydraulic push rod 323 applying thrust to the four-bar linkage assembly.

[0079] This invention comprises four connecting shafts with identical or similar structures and fixing methods. Two long arm rods 311 are symmetrically installed on both sides of the connecting rod base 314. The lower end hole of the long arm rod 311 is coaxially fitted with the lower hole of the connecting rod base 314. The short arm rod 312 has a boss 3125 structure, and its lower connecting hole 3123 is coaxially fitted with the ear hole at the end of the side float support 313 and is symmetrically installed on both sides. The upper connecting hole 3122 of the short arm rod 312 is coaxially fitted with the upper connecting holes of the two long arm rods 311 and the end hole of the hydraulic push rod 323, all of which are positioned and connected by the second connecting shaft 317. The connection method of each connecting shaft is clearance fit. The connecting rod base 314, the side float support 313, the long arm rod 311, and the short arm rod 312 form a four-bar linkage mechanism. By adjusting the structure and length parameters of each connecting rod, the opening and closing function of the side floating plate 2 on the flat paddy field is realized. It also has a self-locking function when deployed, thereby ensuring the stability of the side floating plate 2 in its deployed state during operation.

[0080] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A self-locking device for deploying the side floats of a paddy field grader, characterized in that, include: A self-locking mechanism includes a connecting rod base, a side float plate support, a long arm, and a short arm. The connecting rod base is mounted on the main float plate, and the side float plate support is mounted on the side float plate. One end of the side float plate support is hinged to the upper end of the connecting rod base, the lower end of the long arm is hinged to the connecting rod base, one end of the short arm is hinged to the side float plate support, and the other end of the short arm is hinged to the upper end of the long arm. A power mechanism, installed on the main float and connected to the upper end of the long boom and the other end of the short boom, is used to realize the unfolding and folding of the side float relative to the main float; Two long arms are symmetrically installed on both sides of the connecting rod base. Each end of the long arm has a connecting hole. A boss is provided on one side of the long arm corresponding to the connecting hole. The connecting hole at the lower end of the long arm is coaxially engaged with the lower hole of the connecting rod base through the first connecting rod shaft, and the end face of the boss faces the connecting rod base. The short arm is a pair of symmetrically arranged ear plates, which are connected by a crossbeam. The ear plates are provided with an upper connecting hole and a lower connecting hole. The upper connecting hole is connected to the other end connecting hole of the two long arms through a second connecting rod shaft. The side float support includes two symmetrically arranged side plates, which are connected by a base plate. The extended ends of the two side plates are respectively provided with first ear holes. The connecting rod base includes two symmetrically arranged base plates, which are respectively provided with upper holes at their top ends. The side float support is connected to the connecting rod base through the first ear holes and the upper holes via a third connecting rod shaft. The lower connecting hole of the short arm is connected to the second ear hole of the two side plates through the fourth connecting rod shaft. The two fourth connecting rod shafts pass through the second ear hole and the lower connecting hole from the outside of the two side plates respectively. The short boom is provided with a boss, and the side float support is provided with a stop block. The boss is provided on the crossbeam, and the stop block is located between the two side plates and is provided corresponding to the boss.

2. The side float deployment self-locking device of the paddy field grader according to claim 1, characterized in that, The power mechanism includes a cylinder mounting base and a hydraulic telescopic cylinder. The cylinder mounting base is mounted on the main float plate, and the hydraulic cylinder seat of the hydraulic telescopic cylinder is mounted on the cylinder mounting base. The top end of the hydraulic push rod of the hydraulic telescopic cylinder is connected to the second connecting rod shaft.

3. The side float deployment self-locking device of the paddy field grader according to claim 2, characterized in that, The hydraulic push rod pushes the second connecting rod shaft, which in turn drives the long boom, short boom, and side float support to rotate around the first connecting rod shaft, the fourth connecting rod shaft, and the third connecting rod shaft, respectively, until the boss of the short boom contacts the stop block. At this point, the hydraulic telescopic cylinder stops operating, and the side float unfolds and is located on the same plane as the main float.

4. The side float deployment self-locking device of the paddy field grader according to claim 3, characterized in that, When the side float is deployed, the hole spacing L2 of the side float support is parallel to the plane of the main float, and L2 = L 1-2 L3+L 1-1 = L4 + α, 1 ≤ α ≤ 5, the angle θ between the lines connecting the hole spacing L3 of the short arm and the hole spacing L4 of the long arm satisfies: 2° < θ < 7°, where L 1-1 Let L1 be the component of the hole spacing L1 of the connecting rod base in the direction parallel to the main float plate. 1-2 Let L1 be the component of the hole spacing L1 of the connecting rod base in the direction perpendicular to the main float plate.

5. A paddy field leveling machine, characterized in that, Includes the side float deployment self-locking device as described in any one of claims 1-4.

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