Irrigation device for agricultural rice planting

Abstract

The invention discloses an irrigation device for agricultural rice planting, and relates to the field of agricultural irrigation, the irrigation device comprises a branch pipe, the water outlet end of the branch pipe is rotatably provided with a movable pipe, the water outlet end of the movable pipe is provided with at least one water spraying pipe in an up-and-down swinging manner, the movable pipe is sleeved with a lantern ring, and the lantern ring is provided with a water outlet. A connecting rod is movably arranged between the lantern ring and the water spraying pipe; the kinetic energy collecting mechanism is arranged in the branch pipe and is used for generating mechanical kinetic energy under the driving of the irrigation water flow; the reciprocating linear driving mechanism is in transmission connection with the lantern ring; the rotary driving mechanism is in transmission connection with the movable pipe; according to the irrigation device, kinetic energy of water flow is captured through the kinetic energy collecting mechanism in the branch pipe, and the reciprocating linear driving mechanism and the rotary driving mechanism are driven, so that the water spraying pipe automatically swings up and down and triggers circumferential rotation at the swing limit position, and 360-degree uniform irrigation is automatically completed without external power.

Description

Technical Field

[0001] This invention relates to agricultural irrigation technology, specifically to an irrigation device for rice cultivation. Background Technology

[0002] In rice cultivation, uniform irrigation is crucial for ensuring crop growth and improving water resource utilization. Currently, while common sprinkler or rocker-arm sprinklers can cover a certain area, their oscillation or rotation is typically powered by water pressure (e.g., rocker-arm sprinklers) or additional electric / hydraulic motors. Devices relying on water pressure are unstable and susceptible to pressure fluctuations, and their fixed spray angle makes it difficult to achieve customized, uniform 360-degree coverage. Devices relying on external electric drives require power lines to be laid in the field, which is costly and poses safety hazards; devices relying on additional hydraulic motors are structurally complex and energy-intensive.

[0003] Regardless of the method used, existing technologies fail to fully utilize the kinetic energy inherent in the irrigation water flow and directly and efficiently convert it into mechanical energy that drives the sprinkler head to perform ordered two-dimensional motion (pitch and rotation). This results in existing irrigation devices either having low automation and inconvenient adjustment, or relying on external energy sources, which is neither economical nor environmentally friendly. Therefore, how to design a device that can automatically convert the kinetic energy of irrigation water flow into the regular oscillation and rotational power of the sprinkler head on-site, thereby achieving automatic and uniform irrigation without external power, has become a pressing technical problem to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide an irrigation device for rice cultivation in agriculture, in order to solve the problem that existing irrigation devices fail to fully utilize the kinetic energy contained in the irrigation water flow itself and directly and efficiently convert it into mechanical energy to drive the nozzles to perform orderly two-dimensional motion.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an irrigation device for agricultural rice planting, comprising a branch pipe, wherein a movable pipe is rotatably provided at the outlet end of the branch pipe, and at least one spray pipe is provided at the outlet end of the movable pipe that can swing up and down, a collar is sleeved on the movable pipe, and a connecting rod is movably provided between the collar and the spray pipe.

[0006] A kinetic energy harvesting mechanism is installed inside the branch pipe to generate mechanical kinetic energy driven by the irrigation water flow;

[0007] A reciprocating linear drive mechanism is connected to the collar drive and is used to receive the output of the kinetic energy harvesting mechanism and drive the collar to move up and down periodically.

[0008] A rotary drive mechanism is connected to the movable pipe and configured to drive the movable pipe to rotate by a preset angle in response to the water spray pipe swinging to a preset position.

[0009] Furthermore, the kinetic energy harvesting mechanism includes an impeller rotatably disposed within the branch pipe, and also includes an energy conversion mechanism. The input end of the energy conversion mechanism is drivenly connected to the shaft of the impeller, and its output end is drivenly connected to the reciprocating linear drive mechanism to provide driving force.

[0010] Furthermore, the reciprocating linear drive mechanism includes a housing disposed on a branch pipe, a reciprocating lead screw movably disposed within the housing, a reciprocating slider being driven on the reciprocating lead screw, and a bracket movably disposed between the reciprocating slider and the collar.

[0011] Furthermore, the energy conversion mechanism includes a worm gear mounted on the impeller shaft, and a worm wheel mounted on the reciprocating screw, the worm wheel meshing with the worm gear.

[0012] Furthermore, the rotary drive mechanism includes a movable ring movably mounted on the movable tube, the movable ring being located at the bottom of the collar, a one-way bearing being provided between the movable ring and the movable tube, a helical tooth ring one being provided on the lower surface of the movable ring, a helical tooth ring two being provided on the upper surface of the movable ring, a helical tooth block one being provided on the bracket, the helical tooth block one corresponding to the helical tooth ring one, a helical tooth block two being provided at the bottom of the collar, the helical tooth block two corresponding to the helical tooth ring two, and the helical tooth ring one and the helical tooth ring two being staggered.

[0013] Furthermore, the bracket is provided with a sliding block, and the bottom of the collar is provided with a guide rail, which is slidably connected to the sliding block.

[0014] Furthermore, a threaded rod is provided at the bottom of the sliding block, and a stop block is provided through the threaded rod through the bracket. A nut is threaded on the threaded rod at the top of the bracket.

[0015] Furthermore, a flexible hose is provided to connect the water spray pipe and the movable pipe.

[0016] Furthermore, a fixing seat is provided at the bottom of the branch pipe, and a connector is provided at the water inlet end of the branch pipe.

[0017] Compared with the prior art, the irrigation device for rice planting provided by the present invention directly captures the kinetic energy of the irrigation water flow through the kinetic energy collection mechanism set in the branch pipe, and uses it as the sole power source to drive the reciprocating linear drive mechanism and the rotary drive mechanism to work together, realizing the automatic reciprocating swing and intermittent rotation of the water spray pipe; the whole process does not require an external power source or additional power, realizing energy-saving automated irrigation by using water to control water.

[0018] The reciprocating oscillation of the water spray pipe covers the radial distance, while the intermittent rotation triggered by the extreme position of the oscillation covers the circumferential angle; the organic combination of the two allows the water spray trajectory to gradually cover the entire 360-degree circular area, significantly improving irrigation uniformity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0021] Figure 2 A bottom view provided for an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the housing provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the reciprocating linear drive mechanism provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the rotary drive mechanism structure provided in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a threaded rod structure provided in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Branch pipe; 101. Fixed seat; 102. Connector; 2. Movable pipe; 3. Spray pipe; 301. Hose; 4. Collar; 401. Guide rail; 402. Sliding block; 5. Connecting rod; 6. Kinetic energy harvesting mechanism; 601. Impeller; 602. Worm; 603. Worm wheel; 7. Reciprocating linear drive mechanism; 701. Housing; 702. Bracket; 703. Reciprocating lead screw; 704. Nut; 705. Stop block; 706. Reciprocating slider; 707. Threaded rod; 8. Rotary drive mechanism; 801. Movable ring; 802. Helical tooth ring one; 803. Helical tooth ring two; 804. Helical tooth block one; 805. Helical tooth block two. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] As attached Figure 1 To be continued Figure 6 As shown:

[0030] Example 1:

[0031] The present invention provides an irrigation device for rice planting in agriculture, including a branch pipe 1, a movable pipe 2 rotatably provided at the water outlet end of the branch pipe 1, at least one spray pipe 3 swayably provided at the water outlet end of the movable pipe 2, a collar 4 sleeved on the movable pipe 2, and a connecting rod 5 movably provided between the collar 4 and the spray pipe 3.

[0032] The kinetic energy harvesting mechanism 6 is installed inside the branch pipe 1 and is used to generate mechanical kinetic energy driven by the irrigation water flow.

[0033] The reciprocating linear drive mechanism 7 is connected to the collar 4 for transmission, and is used to receive the output of the kinetic energy harvesting mechanism 6 and drive the collar 4 to move up and down periodically.

[0034] The rotary drive mechanism 8 is connected to the movable tube 2 and is configured to drive the movable tube 2 to rotate by a preset angle in response to the water spray pipe 3 swinging to a preset position.

[0035] Specifically, the kinetic energy harvesting mechanism 6 includes an impeller 601 rotatably disposed in the branch pipe 1, and also includes an energy conversion mechanism. The input end of the energy conversion mechanism is drivenly connected to the rotating shaft of the impeller 601, and its output end is drivenly connected to the reciprocating linear drive mechanism 7 to provide driving force.

[0036] Specifically, a flexible hose 301 is installed between the water spray pipe 3 and the movable pipe 2.

[0037] Specifically, a fixing seat 101 is provided at the bottom of branch pipe 1, and a connector 102 is provided at the water inlet end of branch pipe 1.

[0038] The branch pipe 1 is welded to a fixing base 101 at its bottom, which is used to securely install the entire device on the field ridge or a pre-set base. The inlet end of the branch pipe 1 is equipped with a standard threaded connector 102 or a quick connector 102 for connecting to the main irrigation pipe.

[0039] The outlet end of branch pipe 1 is rotatably mounted with movable pipe 2 via a waterproof bearing; the outlet end of movable pipe 2 is mounted with spray pipe 3 that can swing up and down via a hinge shaft. The nozzle of spray pipe 3 can be selected as a fan nozzle or an atomizing nozzle as needed; to ensure that the water path is unobstructed during the swinging process of spray pipe 3, movable pipe 2 and spray pipe 3 are connected by a section of pressure-resistant flexible hose 301.

[0040] A collar 4 is loosely fitted outside the vertical section of the movable tube 2, and can slide up and down along the movable tube 2, but cannot rotate relative to it; the collar 4 is hinged to the middle or rear of the water spray pipe 3 by a connecting rod 5, thereby converting the up and down linear motion of the collar 4 into the up and down swinging motion of the water spray pipe 3 around its hinge axis.

[0041] The kinetic energy harvesting mechanism 6 in this embodiment mainly includes an impeller 601 rotatably disposed inside the branch pipe 1. The impeller 601 can be a radial flow impeller 601 or an axial flow impeller 601, and its shaft passes through the wall of the branch pipe 1 via a pair of sealed bearings. Outside the branch pipe 1, the shaft of the impeller 601 is directly connected to the input shaft of a miniature DC generator (which can be part of an energy conversion mechanism) via a coupling; the generator can convert the rotational mechanical energy of the impeller 601 into electrical energy.

[0042] In this embodiment, the reciprocating linear drive mechanism 7 uses an electric push rod (as an electric drive component); the cylinder of the electric push rod is fixedly installed on the outer wall of the branch pipe 1, and the telescopic end of the push rod is connected to the collar 4 through a bearing, so that the collar 4 can be directly driven to move up and down reciprocally.

[0043] In this embodiment, the rotary drive mechanism 8 employs a miniature servo motor or stepper motor with a reducer (as an electric drive component). The motor is fixed to the branch pipe 1 via a mounting plate, located near the root of the movable pipe 2. A drive gear is mounted on the motor's output shaft, while a driven gear ring (or large gear) is fixedly fitted onto the movable pipe 2. The drive gear meshes with the driven gear ring, thus forming a gear transmission pair that transmits the motor's rotational motion to the movable pipe 2.

[0044] A programmable logic controller or microcontroller is installed in a waterproof electrical control box, which is fixed on branch pipe 1; the power input terminal of the controller is connected to the output terminal of the generator (which can be rectified and regulated by a rectifier circuit), and its two control output terminals are electrically connected to the electric push rod and the driver of the rotary motor, respectively.

[0045] To prevent the movable tube 2 from rotating arbitrarily due to gravity or wind when there is no drive signal, an appropriate rotation damper is installed at the bearing between the movable tube 2 and the branch tube 1, or an electromagnetic brake that can be locked by the controller is installed to keep the position of the movable tube 2 fixed during non-rotation drive periods.

[0046] Working principle: After irrigation begins, water flows through branch pipe 1, driving impeller 601 to rotate; impeller 601 drives generator to generate electricity, which supplies the controller and energy storage unit (such as a battery, optional).

[0047] The controller operates according to a preset program: First, it controls the electric push rod to extend and retract periodically; the extension of the electric push rod drives the collar 4 to move upward, pulling the water spray pipe 3 upward through the connecting rod 5; the retraction of the push rod drives the collar 4 to move downward, pushing the water spray pipe 3 downward. This cycle repeats, realizing the reciprocating pitching and swaying of the water spray pipe 3, irrigating nearby and distant areas;

[0048] Secondly, the controller has a preset judgment logic for the angle sensor (such as the one installed at the hinge of the water spray pipe 3) or a calculation logic based on the running time of the electric push rod; when it is determined that the water spray pipe 3 has swung to the preset upper or lower limit position, the controller sends a pulse signal to the rotary motor; the rotary motor starts and drives the movable pipe 2 (together with all its components) to rotate precisely by a preset angle (e.g., 5° or 10°) through the gear pair.

[0049] One swing combined with a small-angle rotation constitutes a complete working cycle. Repeating this cycle, the water spray trajectory of the water pipe 3 will start from the initial position and gradually cover a complete 360-degree fan-shaped or circular area, achieving all-round uniform irrigation.

[0050] This embodiment is suitable for large-scale farms or modern agricultural parks with high requirements for irrigation automation and a certain level of electrical maintenance knowledge. Its advantages lie in precise control; the oscillation frequency, amplitude, and rotation angle can all be flexibly adjusted through programming to adapt to the irrigation needs of different crops and different growth stages. Utilizing the kinetic energy of water flow to generate electricity achieves energy self-sufficiency, making it energy-saving and environmentally friendly.

[0051] Working principle: In this embodiment, the impeller 601 converts the kinetic energy of water flow into electrical energy. The controller drives the linear actuator and the rotary actuator in a time-sharing manner according to the preset logic, thereby converting the continuous water flow energy into an orderly, spatially comprehensive irrigation action.

[0052] Example 2:

[0053] This embodiment is basically the same as the previous embodiment, except that the reciprocating linear drive mechanism 7 includes a housing 701 disposed on the branch pipe 1, a reciprocating lead screw 703 is movably disposed in the housing 701, a reciprocating slider 706 is driven on the reciprocating lead screw 703, and a bracket 702 is movably disposed between the reciprocating slider 706 and the collar 4.

[0054] Specifically, the energy conversion mechanism includes a worm 602 mounted on the shaft of the impeller 601, and a worm wheel 603 mounted on the reciprocating screw 703, which meshes with the worm 602.

[0055] Specifically, the rotary drive mechanism 8 includes a movable ring 801 movably mounted on the movable tube 2. The movable ring 801 is located at the bottom of the collar 4. A one-way bearing is provided between the movable ring 801 and the movable tube 2. A helical tooth ring 802 is provided on the lower surface of the movable ring 801, and a helical tooth ring 803 is provided on the upper surface of the movable ring 801. A helical tooth block 804 is provided on the bracket 702, and the helical tooth block 804 corresponds to the helical tooth ring 802. A helical tooth block 805 is provided at the bottom of the collar 4, and the helical tooth block 805 corresponds to the helical tooth ring 803. The helical tooth ring 802 and the helical tooth ring 803 are staggered.

[0056] Specifically, a sliding block 402 is provided on the bracket 702, and a guide rail 401 is provided at the bottom of the collar 4. The guide rail 401 is slidably connected to the sliding block 402.

[0057] In this embodiment, the kinetic energy harvesting mechanism 6 also includes an impeller 601; however, its energy conversion mechanism is no longer a generator, but a mechanical speed change and reversing mechanism.

[0058] The reciprocating linear drive mechanism 7 includes a housing 701 fixed to the outer wall of the branch pipe 1. A reciprocating lead screw 703 is horizontally mounted inside the housing 701 via bearings. A specific part of the reciprocating lead screw 703 is made with reciprocating threads (commonly known as "back and forth threads"), that is, a left-hand thread followed by a right-hand thread; a reciprocating slider 706 that matches the reciprocating threads is sleeved on the reciprocating lead screw 703; an L-shaped bracket 702, one end of which is fixed to the reciprocating slider 706, and the other end extends upward.

[0059] The key energy conversion mechanism includes a worm 602 fixed on the impeller 601 shaft and a worm wheel 603 fixed on one end of the reciprocating screw 703. The worm wheel 603 meshes with the worm 602 to form a worm 602 and worm wheel 603 reducer with self-locking characteristics. Its function is to convert the rotation of the impeller 601 into the rotation of the reciprocating screw 703, while greatly reducing the speed and increasing the torque.

[0060] The rotary drive mechanism 8 includes a movable ring 801 fitted onto the movable tube 2 via a one-way bearing (allowing only unidirectional torque transmission); the movable ring 801 is located directly below the collar 4; a helical toothed ring 802 is machined on the lower surface of the movable ring 801, and a helical toothed ring 803 is machined on its upper surface; the helical toothed ring 802 and the helical toothed ring 803 have opposite directions of tooth profile and are staggered by a tooth pitch or a specific angle in the circumferential direction; a helical toothed block 804 is vertically fixed at the top of the bracket 702, and its lower end face has helical teeth that match the helical toothed ring 802; a helical toothed block 805 is vertically fixed at the bottom of the collar 4, and its lower end face has helical teeth that match the helical toothed ring 803.

[0061] The connection between the bracket 702 and the collar 4 is a sliding connection. Specifically, a guide rail 401 is fixed at the bottom of the collar 4, and a sliding block 402 that cooperates with the guide rail 401 is fixed at the top of the bracket 702, so that the bracket 702 can push the collar 4 to move up and down, and at the same time allow the collar 4 to rotate with the movable tube 2 at the top of the bracket 702.

[0062] Working principle: Irrigation water flow drives impeller 601 to rotate; impeller 601 drives worm 602 to rotate, which in turn drives worm wheel 603 and reciprocating screw 703 to rotate slowly;

[0063] The rotation of the reciprocating screw 703 drives the reciprocating slider 706 on it to perform reciprocating linear motion (up-down-up) along the housing 701; the reciprocating slider 706 drives the sliding block 402 through the bracket 702 to push or pull the entire collar 4 to perform up-down reciprocating motion; the collar 4 then drives the water spray pipe 3 to swing up and down through the connecting rod 5; this is the first automatically completed action: converting the continuous rotational energy of the water flow into the reciprocating swing energy of the water spray pipe 3;

[0064] There are two states for the helical tooth block and the tooth block on the helical tooth ring: one is alignment, in which the inclined surfaces of the contacting blocks will come into contact, thereby generating a tangential force to drive the movable ring 801 to rotate; the other is misalignment, in which the helical tooth block is located in the tooth groove of the helical tooth ring and will not come into contact with the tooth block on it.

[0065] When the collar 4 is driven to its lower limit position by the bracket 702, the helical tooth block 805 fixed at the bottom of the collar 4 presses down and contacts the inclined surface of the helical tooth ring 803 on the upper surface of the movable ring 801. Due to the effect of the inclined surface, the downward force generates a tangential component force; since the movable ring 801 is mounted on the movable tube 2 through a one-way bearing, and the setting direction of the one-way bearing allows this tangential force to drive the movable ring 801 to rotate on the movable tube 2, the downward pressure of the helical tooth block 805 will drive the movable ring 801 (without driving the movable tube 2 to rotate through the one-way bearing) to rotate a small angle; this is the first rotation trigger. After the movable ring 801 rotates, its helical tooth ring 802 aligns with the helical tooth block 804.

[0066] When the collar 4 is driven to its upper limit position by the bracket 702, the helical tooth block 804 fixed on the bracket 702 just reaches its upper limit and contacts the inclined surface of the helical tooth ring 802 on the lower surface of the movable ring 801. Similarly, the upward force generates a tangential component force through the inclined surface. Due to the setting of the one-way bearing, the movable ring 801 cannot rotate on the movable tube 2 in this direction, and thus the movable tube 2 is driven to rotate together through the movable ring 801. This is the second rotation trigger. Since the helical tooth ring 802 and the helical tooth ring 803 are staggered, when the helical tooth ring 802 is aligned with the helical tooth block 804, the helical tooth ring 803 is aligned with the helical tooth block 805. Thus, when the collar 4 rises, the movable ring 801 is reset, so that it can be driven to rotate a small angle again when descending.

[0067] Thus, each time the water spray pipe 3 completes a full up-and-down swing cycle (up-down), the movable pipe 2 is driven to rotate once, with each rotation at a fixed angle; after multiple swing cycles, the movable pipe 2 will achieve 360-degree intermittent rotation; the one-way bearing between the movable ring 801 and the movable pipe 2 ensures the unidirectional rotation and prevents reverse rotation.

[0068] This embodiment is applicable to vast farmland areas with no stable power supply and relatively simple maintenance conditions. Its greatest advantage is its all-mechanical structure, high reliability, maintenance-free operation (except for periodic lubrication), and long service life. It cleverly decomposes and sequentially outputs two-dimensional motion through the worm gear 602, worm wheel 603, reciprocating screw 703, and inclined plane triggering mechanism, realizing "pure hydraulic automation". The structure is compact and the cost is low.

[0069] The worm gear 602 and worm wheel 603 are used to reduce speed and reverse direction, and the reciprocating screw 703 is used to convert the rotation into linear reciprocating motion to realize the nozzle oscillation. At the same time, at the two extreme positions of the linear motion, the unidirectional rotation mechanism is triggered by the inclined plane gear mechanism to convert the instantaneous kinetic energy of the linear motion into intermittent rotational stepping motion, thereby automatically distributing the single power source into two orderly output actions.

[0070] Example 3:

[0071] This embodiment is basically the same as the previous embodiment, except that a threaded rod 707 is provided at the bottom of the sliding block 402, a stop block 705 is provided through the threaded rod 707 through the bracket 702, and a nut 704 is threaded on the threaded rod 707 at the top of the bracket 702.

[0072] Working principle: By rotating the adjusting nut 704, the height position of the adjusting nut 704 on the threaded rod 707 can be changed;

[0073] When the height adjustment nut 704 is tightened, the distance between the bracket 702 and the nut 704 increases. At this point, when the bracket 702 moves upward, it needs to move a greater distance to contact the nut 704 and push it, along with the collar 4, upward. Since the total stroke of the bracket 702 is fixed, the vertical movement stroke of the collar 4 relative to the movable pipe 2 is relatively shortened, thus reducing the swing angle transmitted from the connecting rod 5 to the spray pipe 3. Conversely, tightening the height adjustment nut 704 increases the swing angle and extends the spraying distance.

[0074] This adjustment can be made before the start of the irrigation season or manually as needed by the crop, and it is easy to operate.

[0075] This embodiment is particularly suitable for scenarios where the size of the field varies or different growth stages of rice (such as shallow irrigation for seedlings and deep irrigation for tillering) have different requirements for the spray radius; through simple mechanical adjustment, the irrigation coverage range can be customized, improving the adaptability and versatility of a single device, without the need to replace different models of nozzles or actuators.

[0076] This embodiment inherits all the functions of "pure mechanical linkage automation" in Embodiment 2, and realizes the adjustment of the swing amplitude of the water spray pipe 3 by introducing an adjustable mechanical interface; its core is to add a height-variable link in the power transmission path (from bracket 702 to collar 4), and ultimately control the movement amplitude of the output end by changing the effective lever arm.

[0077] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An irrigation device for agricultural rice cultivation, comprising a branch pipe (1), characterized in that, The outlet end of the branch pipe (1) is rotatably provided with a movable pipe (2), and the outlet end of the movable pipe (2) is provided with at least one spray pipe (3) that can swing up and down. A collar (4) is sleeved on the movable pipe (2), and a connecting rod (5) is movably provided between the collar (4) and the spray pipe (3). A kinetic energy harvesting mechanism (6) is installed inside the branch pipe (1) and is used to generate mechanical kinetic energy under the drive of irrigation water flow; A reciprocating linear drive mechanism (7) is connected to the collar (4) for receiving the output of the kinetic energy harvesting mechanism (6) and driving the collar (4) to move up and down periodically. The rotary drive mechanism (8) is connected to the movable pipe (2) and is configured to drive the movable pipe (2) to rotate by a preset angle in response to the water spray pipe (3) swinging to a preset position.

2. The irrigation device for rice cultivation according to claim 1, characterized in that, The kinetic energy harvesting mechanism (6) includes an impeller (601) rotatably disposed in the branch pipe (1) and an energy conversion mechanism. The input end of the energy conversion mechanism is connected to the rotating shaft of the impeller (601) and its output end is connected to the reciprocating linear drive mechanism (7) to provide driving force.

3. The irrigation device for rice cultivation according to claim 2, characterized in that, The reciprocating linear drive mechanism (7) includes a housing (701) disposed on the branch pipe (1), a reciprocating screw (703) is movably disposed inside the housing (701), a reciprocating slider (706) is driven on the reciprocating screw (703), and a bracket (702) is movably disposed between the reciprocating slider (706) and the collar (4).

4. The irrigation device for rice cultivation according to claim 3, characterized in that, The energy conversion mechanism includes a worm (602) mounted on the shaft of the impeller (601), and a worm wheel (603) mounted on the reciprocating screw (703), the worm wheel (603) meshing with the worm (602).

5. An irrigation device for rice cultivation according to claim 3, characterized in that, The rotary drive mechanism (8) includes a movable ring (801) movably mounted on the movable tube (2). The movable ring (801) is located at the bottom of the collar (4). A one-way bearing is provided between the movable ring (801) and the movable tube (2). A helical tooth ring one (802) is provided on the lower surface of the movable ring (801). A helical tooth ring two (803) is provided on the upper surface of the movable ring (801). A helical tooth block one (804) is provided on the bracket (702). The helical tooth block one (804) corresponds to the helical tooth ring one (802). A helical tooth block two (805) is provided at the bottom of the collar (4). The helical tooth block two (805) corresponds to the helical tooth ring two (803). The helical tooth ring one (802) and the helical tooth ring two (803) are staggered.

6. An irrigation device for rice cultivation according to claim 3, characterized in that, The bracket (702) is provided with a sliding block (402), and the bottom of the collar (4) is provided with a guide rail (401), which is slidably connected to the sliding block (402).

7. An irrigation device for rice cultivation according to claim 6, characterized in that, The bottom of the sliding block (402) is provided with a threaded rod (707), the threaded rod (707) passes through the bracket (702) and is provided with a stop block (705), and a nut (704) is threaded on the threaded rod (707) at the top of the bracket (702).

8. An irrigation device for rice cultivation according to claim 1, characterized in that, A flexible hose (301) is provided to connect the water spray pipe (3) and the movable pipe (2).

9. An irrigation device for rice cultivation according to claim 1, characterized in that, The bottom of the branch pipe (1) is provided with a fixing seat (101), and the water inlet end of the branch pipe (1) is provided with a connector (102).

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