Rice soil plowing equipment

By designing a rice soil tilling equipment using handrails, rotator, rotating rod, dragging wheel, steel curtain and shock absorber, the problems of difficulty and poor stability of traditional equipment on different terrains are solved, and high efficiency is achieved , flexible soil tilling and irrigation improves operating efficiency and soil fertility.

CN222424667UActive Publication Date: 2025-02-07HEILONGJIANG AGRI ECONOMY VOCATIONAL COLLEGE
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Patent Information

Application Number
CN202421260291.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-04
Publication Date
2025-02-07
Estimated Expiration
2034-06-04

AI Technical Summary

Technical Problem

Traditional rice soil tillage equipment is difficult to drive on different terrain, has poor stability, is inconvenient to operate, is inefficient, and lacks flexibility to meet different soil and operation needs.

Method used

A rice soil tilling equipment was designed, using handrails, rotator, rotating rod, drag wheel, steel curtain and shock absorber to improve the stability and comfort of the equipment, and realize it through water tanks, self-priming pumps, water pipes and spray heads. Irrigation and tilling, electric telescopic poles, protective shells and tillers are used to suit different soil types and operational needs.

Benefits of technology

It improves the stability and work efficiency of the equipment, reduces the labor intensity of the operator, and realizes effective treatment, crushing and loosening of the soil, thereby improving soil fertility and crop growth effect.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the field of soil plowing, and discloses rice soil plowing equipment which comprises a base, a control panel is arranged at the center of one side wall of the base, a power supply structure is arranged at the position, close to one side, of the center of the upper end face of the base, and a spraying structure is arranged at the position, close to the other side, of the center of the upper end face of the base. By means of the handrail, the rotator, the rotating rod, the dragging wheels, the steel curtain and the shock absorber, an operator can easily control and manipulate the whole moving structure, the stability and comfort of equipment are improved through the design, meanwhile, the equipment can flexibly run on different terrains, the working efficiency and the operation precision are improved, and the practicability is high. By means of the water tank, the self-priming pump, the water conveying pipe and the spray head, irrigation water can be sprayed to land needing to be ploughed, the operation efficiency of farmers is effectively improved, the labor intensity of the farmers is relieved, and the water conveying pipe is made of a hose material, has flexibility and elasticity and can better adapt to movement and change of a spraying system.
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Description

Technical Field

[0001] The utility model relates to the field of soil tillage, in particular to a paddy soil tillage device. Background Art

[0002] The emergence of rice soil tillage equipment is the product of the development of agricultural mechanization. With the continuous advancement of agricultural mechanization technology, traditional manual farming and animal farming have gradually been replaced by mechanized equipment to improve production efficiency and reduce labor intensity. Rice is one of the most important food crops in the world.

[0003] Since traditional rice soil tillage equipment may have difficulty traveling on different terrains, has poor stability, may require irrigation and tillage to be performed separately, is inconvenient to operate, has low efficiency, and may lack flexibility in tillage depth and soil treatment intensity, and cannot meet the needs of different soils and operations, therefore, those skilled in the art provide a rice soil tillage equipment to solve the problems raised in the above background technology. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and a rice soil tillage device is proposed. Through handrails, rotators, rotating rods, traction wheels, steel curtains and shock absorbers, the operator can easily control and manipulate the entire mobile structure. This design improves the stability and comfort of the equipment, and at the same time enables the equipment to be flexibly driven on different terrains, thereby improving work efficiency and operation accuracy. Through a water tank, a self-priming pump, a water pipe and a nozzle, irrigation water can be sprayed on the land to be tilled, effectively improving the farmer's work efficiency and reducing their labor intensity. The water pipe is made of a hose material, which is soft and elastic and can better adapt to the movement and changes of the spraying system. By adopting an electric telescopic rod, a protective shell and a tiller, it can be telescopically adjusted as needed to control the tillage depth and soil treatment intensity. This design enables the equipment to adapt to different soil types and operation requirements, and achieves effective soil treatment, crushing and loosening, thereby improving soil fertility and crop growth effects.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rice soil tillage device, comprising a base, a control panel is provided at the center of one side wall of the base, a power supply structure is provided at the center of the upper end surface of the base on one side, a spraying structure is provided at the center of the upper end surface of the base on the other side, four moving structures are arranged in a rectangular shape on the lower end surface of the base, and a tillage structure is provided at the center of the lower end surface of the base;

[0006] Through the above technical solution, through the handrails, rotators, rotating rods, traction wheels, steel curtains and shock absorbers, the operator can easily control and manipulate the entire mobile structure. This design improves the stability and comfort of the equipment, and at the same time enables the equipment to travel flexibly on different terrains, improves work efficiency and operating accuracy, and through the water tank, self-priming pump, water pipe and nozzle, irrigation water can be sprayed on the land that needs to be plowed, effectively improving the farmer's work efficiency and reducing their labor intensity. The water pipe is made of hose material, which is soft and elastic and can better adapt to the movement and changes of the spraying system. By adopting an electric telescopic rod, a protective shell and a tiller, it can be telescopically adjusted as needed to control the tillage depth and soil treatment intensity. This design enables the equipment to adapt to different soil types and operation requirements, and achieve effective soil treatment, crushing and loosening, thereby improving soil fertility and crop growth effects.

[0007] Furthermore, the power supply structure includes a power supply box, a plurality of storage batteries, an inverter, a support rod and a solar panel, wherein the power supply box is arranged at one side of the center of the upper end surface of the base, the plurality of storage batteries are arranged transversely inside the power supply box, the inverter is arranged at the center of the upper end surface of the power supply box, the support rod is arranged at the center of the upper end surface of the power supply box, and the solar panel is arranged at the center of the upper end surface of the support rod;

[0008] Through the above technical solution, the solar panel converts solar light into electrical energy to provide a stable power supply for the equipment. After the light energy is absorbed by the solar panel, it is converted into DC power through the inverter and supplied to various components of the equipment. The inverter is responsible for converting the DC power generated by the solar panel into the AC power required by the equipment. The battery is responsible for storing the electricity converted by the solar panel and provides power support for the equipment when solar energy cannot be obtained at night or on rainy days. Multiple batteries increase the energy storage capacity to ensure long-term stable operation of the equipment. The support rods firmly support the solar panel to ensure that it correctly receives sunlight and ensures the safety and stability of the solar panel, thereby improving energy conversion efficiency, reducing dependence on traditional energy, reducing energy consumption, and reducing pollution to the environment, with good environmental benefits.

[0009] Further, the mobile structure includes a handrail, a rotator, a rotating rod, two traction wheels, two steel curtains and a shock absorber, wherein the handrail is arranged at the center of one side wall of the base, the shock absorber is arranged on the lower end surface of the base, the rotator is arranged at the center of the lower end surface of the rotator, the rotating rod is arranged on the output end of the rotator, the two traction wheels are respectively arranged at the center of the front end surface and the rear end surface of the rotating rod, and the two steel curtains are respectively sleeved on the outer side walls of the two groups of traction wheels;

[0010] Through the above technical solution, the handrail provides the operator with a stable support point, so that the operator can easily control and manipulate the entire mobile structure. The shock absorber reduces vibration and impact, protects the equipment and the operator from adverse environments, and improves the stability and comfort of the equipment. The rotator drives the rotating rod to rotate, and the rotating rod drives the two traction wheels to rotate, so that the equipment can achieve flexible changes in direction to adapt to different work scenes and operation requirements. The traction wheels and steel curtains enable the mobile structure to travel stably on different terrains. At the same time, the steel curtains protect the traction wheels from damage by external gravel or other objects, so that the operator can more easily and accurately control the moving direction and speed of the equipment, thereby improving work efficiency and operation accuracy.

[0011] Furthermore, the tilling structure includes four electric telescopic rods, two protective shells and two tillers, the four electric telescopic rods are arranged front and back at the center of the lower end surface of the base, the two protective shells are respectively arranged on the output ends of the four electric telescopic rods, and the two tillers are respectively arranged at the lower center of the two protective shells;

[0012] Through the above technical solution: when tilling, the electric telescopic rod is telescoped and adjusted as needed to control the tilling depth and soil treatment intensity. The protective shell protects the tiller from the influence of the external environment and provides support and fixation to ensure the stable operation of the tiller. The tiller is responsible for the actual execution of soil tillage and treatment. Through rotation and digging movements, the tiller can turn over, crush and mix the soil, thereby improving soil structure, aeration and fertility. According to different soil types and operation requirements, the depth and intensity of the tiller are controlled to achieve effective soil treatment, crushing and loosening, promote soil ventilation and water penetration, and improve soil fertility and crop growth effects.

[0013] Furthermore, the spraying structure includes a water tank, a water inlet, a self-priming pump, a water pipe and a nozzle, wherein the water tank is arranged at one side of the center of the upper end surface of the base, the water inlet is arranged at the center of the upper end surface of the water tank, the self-priming pump is arranged at one side of the center of the lower inner wall of the water tank, the water pipe is arranged on the output end of the self-priming pump, and the nozzle is arranged on the output end of the water pipe;

[0014] Through the above technical scheme, the water tank is used to store irrigation water, and the water inlet is used to add water to the water tank. After water is added to the water tank, the water is pumped out of the water tank through the self-priming principle of the self-priming pump and provided to the nozzle for spraying. The water pipe transports the water pumped from the water tank by the self-priming pump to the nozzle. The nozzle is responsible for spraying water onto the land that needs to be plowed, which facilitates plowing, effectively improves farmers' work efficiency and reduces their labor intensity.

[0015] Furthermore, the output end of the water delivery pipe passes through a side wall of the water tank and reaches the outside of the water tank;

[0016] The above technical solution facilitates the transportation of water.

[0017] Furthermore, the water pipe is made of a hose;

[0018] Through the above technical solution, the softness and elasticity can better adapt to the movement and changes of the spraying system, and at the same time can resist the influence of pressure and external environment.

[0019] Furthermore, the two protective shells are made of aluminum alloy;

[0020] Through the above technical solution, the aluminum alloy has a light weight and excellent strength, can provide sufficient protection, and will not increase the overall load of the system, which helps to improve the portability and operability of the spraying equipment.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the utility model, the rice soil tillage equipment uses handrails, rotators, rotating rods, traction wheels, steel curtains and shock absorbers to enable the operator to easily control and manipulate the entire mobile structure. This design improves the stability and comfort of the equipment, while enabling the equipment to travel flexibly on different terrains, thereby improving work efficiency and operating accuracy.

[0023] 2. In the utility model, irrigation water can be sprayed onto the land that needs to be plowed through the water tank, self-priming pump, water pipe and nozzle, which effectively improves the farmers' working efficiency and reduces their labor intensity. The water pipe is made of hose material, which is soft and elastic and can better adapt to the movement and changes of the spraying system.

[0024] 3. In the utility model, by adopting an electric telescopic rod, a protective shell and a tiller, the telescopic adjustment can be carried out as needed to control the tillage depth and soil treatment intensity. This design enables the equipment to adapt to different soil types and operation requirements, and achieve effective soil treatment, crushing and loosening, thereby improving soil fertility and crop growth effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional diagram of a rice soil tillage device proposed by the utility model;

[0026] Figure 2 A three-dimensional cross-sectional view of a rice soil tillage device proposed by the utility model;

[0027] Figure 3 This is a front cross-sectional view of a rice soil tillage device proposed by the utility model;

[0028] Figure 4The utility model is a side sectional view of a paddy soil tillage device.

[0029] Legend:

[0030] 1. Base; 2. Control panel; 3. Power supply structure; 301. Power supply box; 302. Battery; 303. Inverter; 304. Support rod; 305. Solar panel; 4. Mobile structure; 401. Handrail; 402. Rotator; 403. Rotating rod; 404. Traction wheel; 405. Steel curtain; 406. Shock absorber; 5. Tillage structure; 501. Electric telescopic rod; 502. Protective shell; 503. Tillage device; 6. Spraying structure; 601. Water tank; 602. Water inlet; 603. Self-priming pump; 604. Water pipe; 605. Spray nozzle. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Reference Figure 1-4 The utility model provides an embodiment: a rice soil tillage device, including a base 1, a control panel 2 is provided at the center of one side wall of the base 1, a power supply structure 3 is provided at one side of the center of the upper end surface of the base 1, a spraying structure 6 is provided at the other side of the center of the upper end surface of the base 1, and four mobile structures 4 are arranged in a rectangular shape on the lower end surface of the base 1. A tillage structure 5 is provided at the center of the lower end surface of the base 1. The control panel 2 is used to control the device, the power supply structure 3 provides the power required by the device, the spraying structure 6 is used to spray water to facilitate tillage of the land, the mobile structure 4 is used to move the device to facilitate tillage, and the tillage structure 5 is used to till the soil.

[0033] The power supply structure 3 includes a power supply box 301, a plurality of storage batteries 302, an inverter 303, a support rod 304 and a solar panel 305. The power supply box 301 is arranged at one side of the center of the upper end surface of the base 1. The plurality of storage batteries 302 are arranged in a horizontal arrangement inside the power supply box 301. The inverter 303 is arranged at the center of the upper end surface of the power supply box 301. The support rod 304 is arranged at the center of the upper end surface of the power supply box 301. The solar panel 305 is arranged at the center of the upper end surface of the support rod 304. The solar panel 305 converts solar light into electrical energy to provide a stable power supply for the equipment. After the light energy is absorbed by the solar panel 305, it is converted into DC power through the inverter 303 to supply The various components of the device are used, the inverter 303 is responsible for converting the direct current generated by the solar panel 305 into the alternating current required by the device, the battery 302 is responsible for storing the electric energy converted by the solar panel 305, and provides power support for the device when solar energy cannot be obtained at night or on rainy days. Multiple batteries 302 increase the electric energy storage capacity to ensure long-term stable operation of the equipment. The support rod 304 firmly supports the solar panel 305 to ensure that it correctly receives sunlight and ensures the safety and stability of the solar panel 305, thereby improving energy conversion efficiency, reducing dependence on traditional energy, reducing energy consumption, and reducing pollution to the environment, with good environmental benefits.

[0034] The mobile structure 4 includes a handrail 401, a rotator 402, a rotating rod 403, two traction wheels 404, two steel curtains 405 and a shock absorber 406. The handrail 401 is arranged at the center of one side wall of the base 1, the shock absorber 406 is arranged on the lower end surface of the base 1, the rotator 402 is arranged at the center of the lower end surface of the rotator 402, the rotating rod 403 is arranged on the output end of the rotator 402, the two traction wheels 404 are respectively arranged at the center of the front end surface and the rear end surface of the rotating rod 403, and the two steel curtains 405 are respectively sleeved on the outer side walls of the two groups of traction wheels 404. The handrail 401 provides an operator with a stable support point so that the operator can easily control and manipulate the entire mobile structure 4. The shock absorber 406 reduces vibration and impact, protects the equipment and the operator from the impact of adverse environment, and improves the stability and comfort of the equipment. The rotator 402 drives the rotating rod 403 to rotate, and the rotating rod 403 drives the two traction wheels 404 to rotate, so that the equipment can achieve flexible change of direction to adapt to different working scenes and operation requirements. The traction wheels 404 and the steel curtains 405 enable the mobile structure 4 to travel stably on different terrains. At the same time, the steel curtains 405 protect the traction wheels 404 from damage by external gravel or other objects, so that the operator can more easily and accurately control the moving direction and speed of the equipment, thereby improving work efficiency and operating accuracy.

[0035] The tilling structure 5 includes four electric telescopic rods 501, two protective shells 502 and two tillers 503. The four electric telescopic rods 501 are arranged front and back at the center of the lower end surface of the base 1 on both sides. The two protective shells 502 are respectively arranged on the output ends of the four electric telescopic rods 501. The two tillers 503 are respectively arranged at the lower center of the two protective shells 502. When tilling, the electric telescopic rods 501 are telescoped and adjusted as needed to control the tilling depth and soil treatment intensity. The protective shell 502 protects the tiller 503 from the influence of the external environment and provides support and fixing to ensure the stable operation of the tiller 503. The tiller 503 is a component responsible for actually tilling and processing the soil. Through rotation and digging movements, the tiller 503 can turn over, crush and mix the soil, thereby improving the soil structure, aeration and fertility. According to different soil types and operation requirements, the depth and strength of the tiller 503 are controlled to achieve effective soil processing, crushing and loosening, promote soil aeration and water penetration, improve soil fertility and crop growth effects. The two protective shells 502 are both made of aluminum alloy. Aluminum alloy has light weight and excellent strength, can provide sufficient protection, and will not increase the overall load of the system, which helps to improve the portability and operability of the spraying equipment.

[0036] The spraying structure 6 includes a water tank 601, a water inlet 602, a self-priming pump 603, a water pipe 604 and a nozzle 605. The water tank 601 is arranged at one side of the center of the upper end surface of the base 1, the water inlet 602 is arranged at the center of the upper end surface of the water tank 601, the self-priming pump 603 is arranged at one side of the center of the lower inner wall of the water tank 601, the water pipe 604 is arranged on the output end of the self-priming pump 603, and the nozzle 605 is arranged on the output end of the water pipe 604. The water tank 601 is used to store irrigation water, and the water inlet 602 is used to add water to the water tank 601. When water is added to the inside of the water tank 601, the self-priming principle of the self-priming pump 603 is used to Water is pumped out of the water tank 601 and provided to the nozzle 605 for spraying. The water pipe 604 transports the water pumped out from the water tank 601 by the self-priming pump 603 to the nozzle 605. The nozzle 605 is responsible for spraying the water onto the land that needs to be plowed, which facilitates plowing, effectively improves the farmers' work efficiency, and reduces their labor intensity. The output end of the water pipe 604 passes through a side wall of the water tank 601 to the outside of the water tank 601, which facilitates the transportation of water. The water pipe 604 is made of a hose, which is soft and elastic, can better adapt to the movement and changes of the spraying system, and can resist the influence of pressure and external environment.

[0037] Working principle: water tank 601 is used to store irrigation water, water inlet 602 is used to add water to water tank 601, when water is added to water tank 601, water is pumped out of water tank 601 by self-priming pump 603 and provided to nozzle 605 for spraying, water pipe 604 transports water pumped out of water tank 601 by self-priming pump 603 to nozzle 605, nozzle 605 is responsible for spraying water onto the land to be plowed, facilitating plowing, effectively improving farmers' work efficiency and reducing their labor intensity, providing a stable support point for the operator through handrail 401, enabling the operator to easily control and manipulate the entire mobile structure 4, and reducing the vibration through shock absorber 406. The invention reduces vibration and impact, protects the equipment and the operator from the influence of adverse environment, improves the stability and comfort of the equipment, drives the rotating rod 403 to rotate through the rotator 402, and drives the two traction wheels 404 to rotate through the rotating rod 403, so that the equipment can realize flexible change of direction to adapt to different working scenes and operation requirements. The traction wheels 404 and the steel curtains 405 enable the mobile structure 4 to travel stably on different terrains. At the same time, the traction wheels 404 are protected from damage by external gravel or other objects through the steel curtains 405, so that the operator can control the moving direction and speed of the equipment more easily and accurately, thereby improving work efficiency and operation accuracy.

[0038] When tilling, the electric telescopic rod 501 is telescopically adjusted as needed to control the tilling depth and soil treatment strength. The protective shell 502 protects the tiller 503 from the influence of the external environment and provides support and fixation to ensure the stable operation of the tiller 503. The tiller 503 is responsible for the actual execution of soil tillage and treatment. Through rotation and digging movements, the tiller 503 can turn over, crush and mix the soil, thereby improving the soil structure, air permeability and fertility. According to different soil types and operation requirements, the depth and strength of the tiller 503 are controlled to achieve effective soil treatment, crushing and loosening, promote soil ventilation and water penetration, improve soil fertility and crop growth effects, and the solar panel 305 provides stable power for the equipment by converting solar energy into electrical energy. A certain power source is used. After the light energy is absorbed by the solar panel 305, it is converted into direct current power through the inverter 303 and supplied to various components of the device. The inverter 303 is responsible for converting the direct current generated by the solar panel 305 into the alternating current required by the device. The battery 302 is responsible for storing the electric energy converted by the solar panel 305, and provides power support for the device when solar energy cannot be obtained at night or on rainy days. Multiple batteries 302 increase the electric energy storage capacity to ensure long-term stable operation of the device. The support rod 304 firmly supports the solar panel 305 to ensure that it correctly receives sunlight and ensures the safety and stability of the solar panel 305, thereby improving the energy conversion efficiency, reducing the dependence on traditional energy, reducing energy consumption, and reducing pollution to the environment, and having good environmental benefits.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A paddy soil tillage device, comprising a base (1), characterized in that: A control panel (2) is provided at the center of one side wall of the base (1), a power supply structure (3) is provided at the center of the upper end surface of the base (1) on one side, a spraying structure (6) is provided at the center of the upper end surface of the base (1) on the other side, four movable structures (4) are arranged in a rectangular shape at the lower end surface of the base (1), and a tillage structure (5) is provided at the center of the lower end surface of the base (1).

2. A paddy soil tillage device according to claim 1, characterized in that: The power supply structure (3) comprises a power supply box (301), a plurality of storage batteries (302), an inverter (303), a support rod (304) and a solar panel (305); the power supply box (301) is arranged at one side of the center of the upper end surface of the base (1); the plurality of storage batteries (302) are arranged transversely inside the power supply box (301); the inverter (303) is arranged at the center of the upper end surface of the power supply box (301); the support rod (304) is arranged at the center of the upper end surface of the power supply box (301); and the solar panel (305) is arranged at the center of the upper end surface of the support rod (304).

3. The paddy soil tillage equipment according to claim 1, characterized in that: The mobile structure (4) comprises a handrail (401), a rotator (402), a rotating rod (403), two traction wheels (404), two steel curtains (405) and a shock absorber (406); the handrail (401) is arranged at the center of a side wall of the base (1); the shock absorber (406) is arranged on the lower end surface of the base (1); the rotator (402) is arranged at the center of the lower end surface of the rotator (402); the rotating rod (403) is arranged on the output end of the rotator (402); the two traction wheels (404) are respectively arranged at the center of the front end surface and the rear end surface of the rotating rod (403); and the two steel curtains (405) are respectively sleeved on the outer side walls of the two groups of traction wheels (404).

4. The paddy soil tillage equipment according to claim 1, characterized in that: The tilling structure (5) comprises four electric telescopic rods (501), two protective shells (502) and two tillers (503); the four electric telescopic rods (501) are arranged in a front-to-back arrangement at both sides of the center of the lower end surface of the base (1); the two protective shells (502) are respectively arranged on the output ends of the four electric telescopic rods (501); and the two tillers (503) are respectively arranged at the lower center of the two protective shells (502).

5. The paddy soil tillage equipment according to claim 1, characterized in that: The spraying structure (6) comprises a water tank (601), a water inlet (602), a self-priming pump (603), a water pipe (604) and a nozzle (605); the water tank (601) is arranged at one side of the center of the upper end surface of the base (1); the water inlet (602) is arranged at the center of the upper end surface of the water tank (601); the self-priming pump (603) is arranged at one side of the center of the lower inner wall of the water tank (601); the water pipe (604) is arranged at the output end of the self-priming pump (603); and the nozzle (605) is arranged at the output end of the water pipe (604).

6. The paddy soil tillage equipment according to claim 5, characterized in that: The output end of the water delivery pipe (604) passes through a side wall of the water tank (601) and leads to the outside of the water tank (601).

7. The paddy soil tillage equipment according to claim 5, characterized in that: The water delivery pipe (604) is made of a hose.

8. The paddy soil tillage equipment according to claim 4, characterized in that: The two protective shells (502) are both made of aluminum alloy.