Intelligent agricultural greenhouse shed

Abstract

The application relates to the technical field of intelligent greenhouse, and provides an intelligent agricultural greenhouse, which comprises a greenhouse body, a water tank arranged at the bottom of one side of the greenhouse body, a water curtain arranged above the water tank, a pipe system communicated with the water curtain, and a control system, the pipe system comprises a first pipeline communicated with the top end of the water curtain from the water tank, a rotating joint is arranged on the pipeline of the first pipeline, a second pipeline is communicated with the water outlet end of the water seat, branch pipes are communicated with the second pipeline, the control system comprises a rotating frame connected with the second pipeline and a driving device arranged on the rotating frame, the water flow energy of the system is used to drive the cleaning device, the inner surface of the water curtain is washed at a high speed, at a uniform speed and in full coverage, dust, impurities, algae and scale deposited in the deep pores and the surface of the water curtain can be effectively removed, and the core pain point of water curtain blockage is fundamentally solved, and the effective working time and the service life of the water curtain are remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of smart greenhouse technology, and in particular to a smart agricultural greenhouse. Background Technology

[0002] Greenhouses are widely used in agricultural production, creating a controlled microenvironment to enable off-season cultivation or optimize growth conditions for crops. However, especially during the hot summer months, intense solar radiation causes a sharp rise in temperature inside the greenhouse, far exceeding the optimal range for crop growth. Excessive temperatures not only inhibit physiological processes such as photosynthesis and respiration but also lead to water stress, flower and fruit drop, reduced quality, and even plant death. Therefore, efficient and economical cooling technologies are crucial for ensuring stable greenhouse production during the summer. The evaporative cooling system with water curtains and fans is currently a widely adopted active cooling method for greenhouses. This system typically involves installing evaporative cooling pads (also called water curtains, usually made of highly absorbent, honeycomb-like materials) on one wall of the greenhouse (facing the wind) and installing negative pressure fans on the opposite wall. When the fans are activated, they forcefully extract air from the greenhouse, creating negative pressure inside. Under this negative pressure, hot outside air is forced into the greenhouse from the side where the water curtains are installed (the air inlet). When outside air passes through the moist water curtain, it exchanges heat with the water film on the curtain surface and undergoes a process of water evaporation and heat absorption, thus significantly reducing its own temperature (evaporative cooling principle). At the same time, it also plays a role in dust removal. The cooled and dust-removed air enters the greenhouse and is eventually exhausted by the fan, forming a continuous airflow circulation, thereby achieving the overall effect of reducing the temperature inside the greenhouse.

[0003] Existing evaporative cooling systems suffer from the following technical problems: insufficient wetting of the curtain or excessively rapid water flow leads to water being discharged before it can fully evaporate, affecting the overall evaporation efficiency and cooling effect. Poor water curtain quality results in uneven cooling. The porous structure of the water curtain material, while absorbing moisture for evaporation and cooling, also easily attracts pollutants such as dust, impurities, and algae spores from the air. This blocks water flow and air channels, severely reducing the water curtain's permeability (increasing fan energy consumption), hindering air penetration, and significantly decreasing the water absorption and evaporation efficiency, directly weakening the overall cooling system's effectiveness. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a smart agricultural greenhouse, comprising a greenhouse body, a water trough located at the bottom of one side of the greenhouse body, a water curtain located above the water trough, a pipe system connected to the water curtain, and a control system. The pipe system includes a first pipe connected from the water trough to the top of the water curtain, with a rotary joint on the first pipe. The pipe system also includes a two-way pipe connected to the rotary joint, with the other end of the two-way pipe connected to a water seat. The outlet end of the water seat is connected to a second pipe, and a branch pipe is connected to the second pipe. The control system includes a rotating frame connected to the second pipe and a drive device located on the rotating frame. One branch of the branch pipe is connected to the drive device, and the other branch is connected to a third pipe. The third pipe is equipped with a nozzle. The control system also includes a screw driven by the drive device. The third pipe is driven by the screw, and the third pipe sprays water from top to bottom relative to the surface of the water curtain under the drive of the screw.

[0005] As a further preferred embodiment, two water curtains are joined together to form a water curtain group. The first pipe is horizontally positioned above the water curtain group, and the left and right ends of the first pipe are respectively connected to a water curtain. At least two rotary joints are provided on the first pipe, each rotary joint corresponding to the top of a water curtain, and the outlet of each rotary joint is connected to a two-way pipe.

[0006] As a further preferred embodiment, the shape of the rotating frame is consistent with that of the water curtain. When the two-way pipe rotates around the rotary joint, it carries the second pipe through the water seat, and the second pipe carries the rotating frame to rotate relative to the front surface of the water curtain.

[0007] As a further preferred embodiment, the screw is vertically mounted at one end of the rotating frame via a bearing, and the other end of the rotating frame is vertically connected to a guide tube symmetrical to the screw. The third pipe is horizontally arranged inside the rotating frame, with one end of the third pipe extending to one end of the rotating frame and equipped with a transmission seat. The transmission seat is connected to the screw, and the other end of the third pipe is equipped with a sliding hole, which is fitted onto the guide tube.

[0008] As a further preferred embodiment, the drive unit includes a gearbox mounted on a rotating frame and an impeller and gear set assembled inside the gearbox. The end of the screw is assembled into the gearbox and connected to the rotating shaft where the gear set is located. The impeller meshes with the gear set through a gear transmission relationship. One branch pipe of the branch pipe is connected to the gearbox of the drive unit and aligned with the impeller. The other branch pipe of the branch pipe is connected between the water outlet of the gearbox and the third pipe using a flexible pipe. When water is supplied to the first pipe, a portion of the water flows onto the water curtain, and another portion of the water enters the two-way pipe through the rotary joint, enters the gearbox through the two-way pipe, and is sprayed onto the impeller, which then drives the screw to rotate.

[0009] As a further preferred option, the gearbox, as well as the gear set and impeller within the gearbox, are made of lightweight plastic.

[0010] As a further preferred embodiment, a solenoid directional valve is installed on the second pipeline, and a branch pipe three is connected to the solenoid directional valve. Branch pipe one and branch pipe three are connected to the solenoid directional valve, and the other end of branch pipe three is connected to the water outlet of the gearbox. Two limit switches are installed on the rotating frame, one limit switch is close to one end of the screw, and the other limit switch is close to the other end of the screw.

[0011] As a further preferred embodiment, the third pipe is provided with several nozzles, which are evenly distributed along the length of the third pipe.

[0012] The advantages of this invention compared to the prior art are:

[0013] 1. Significantly improves the cooling efficiency and stability of the water curtain: By spraying water vertically from the nozzles and moving at a constant speed with the screw, the inner surface of the water curtain is wetted. This effectively overcomes the unevenness of traditional gravity-based water distribution, greatly improves the quality of the water curtain, ensures that the water curtain is always in an optimal humid state, thereby maximizing the evaporative cooling effect, improving the overall cooling efficiency, and maintaining long-term stability of cooling performance.

[0014] 2. Highly efficient and automated cleaning, solving the clogging problem: Utilizing the system's own water flow energy to drive the cleaning device, it achieves powerful, uniform, and full-coverage rinsing of the inner surface of the water curtain. This effectively removes dust, impurities, algae, and scale deposited deep within the pores and on the surface of the water curtain, fundamentally solving the core problem of water curtain clogging. This significantly extends the effective working time and service life of the water curtain.

[0015] 3. Reduced Operation and Maintenance Costs and Production Impact: The fully automated cleaning process eliminates the expensive, inefficient, time-consuming, and labor-intensive manual cleaning step. It avoids the risk of temperature control failure inside the greenhouse and adverse effects on crop growth caused by the need to interrupt the cooling system during manual cleaning, ensuring the continuity and stability of production. It also reduces the maintenance costs and replacement frequency of the water curtain system. Attached Figure Description

[0016] Figure 1 A schematic diagram showing the distribution of the pipe system, control system, and water curtain in a smart agricultural greenhouse, provided for an embodiment of the present invention.

[0017] Figure 2 A smart agricultural greenhouse provided as an embodiment of the present invention comprises... Figure 1 Enlarged schematic diagram of part A;

[0018] Figure 3 This is a schematic diagram showing the location of the pipe system and control system, as well as the water curtain, in a smart agricultural greenhouse, as provided in an embodiment of the present invention.

[0019] In the diagram: 10, water tank; 20, water curtain; 30, piping system; 310, first pipe; 320, rotary joint; 330, two-way pipe; 340, water seat; 350, second pipe; 360, branch pipe; 3601, branch pipe one; 3602, branch pipe two; 370, third pipe; 380, nozzle; 390, transmission seat; 40, control system; 410, rotating frame; 4101, limit switch; 420, drive device; 4201, gearbox; 4202, impeller; 4203, gear set; 430, screw; 440, guide pipe; 3501, solenoid directional valve; 3502, branch pipe three. Detailed Implementation

[0020] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] In one implementation, such as Figures 1-3 As shown: This embodiment provides a smart agricultural greenhouse, including a greenhouse body, a water trough 10 disposed at the bottom of one side of the greenhouse body, a water curtain 20 disposed above the water trough 10, a pipe system 30 connected to the water curtain 20, and a control system 40. The pipe system 30 includes a first pipe 310 connecting the water trough 10 to the top of the water curtain 20, a rotary joint 320 on the first pipe 310, and a two-way pipe 330 connected to the rotary joint 320. The other end of the two-way pipe 330 is connected to a water seat 340, and the outlet end of the water seat 340 is connected to a second pipe 3 50. A branch pipe 360 ​​is connected to the second pipe 350. The control system 40 includes a rotating frame 410 connected to the second pipe 350 and a drive device 420 set on the rotating frame 410. One branch of the branch pipe 360 ​​is connected to the drive device 420, and the other branch is connected to the third pipe 370. A nozzle 380 is provided on the third pipe 370. The control system 40 also includes a screw 430 driven by the drive device 420. The third pipe 370 is driven by the screw 430. Under the drive of the screw 430, the third pipe 370 sprays water from top to bottom relative to the surface of the water curtain 20.

[0022] The core working principle of this invention lies in utilizing the water curtain water supply pipeline system and extending it into an intelligent system with automatic cleaning function. The specific process is as follows:

[0023] Basic water supply and water curtain formation: After the control system is started, the water pump (not shown in the figure, usually located near the water tank) draws water from the water tank 10 and delivers it upward to the top of the water curtain 20 through the first pipe 310. After the water reaches the top of the water curtain, it flows down the surface of the water curtain by gravity, forming the basic water curtain. This is the prerequisite for the water curtain to play its role in evaporative cooling.

[0024] Water Flow Diversion and Power Acquisition: A rotary joint 320 is installed on the first pipe 310 near the top of the water curtain. One end of the two-way pipe 330 is connected to the first pipe 310 through the rotary joint 320, and the other end is connected to a fixed water seat 340. The outlet of the water seat 340 is connected to the second pipe 350. When water flows upward through the first pipe 310, a portion of the water flows through the rotary joint 320 into the two-way pipe 330, flows through the water seat 340, and then enters the second pipe 350. A branch pipe 360 ​​is connected to the second pipe 350. The water flowing into the second pipe 350 is diverted at the branch pipe 360: one branch flows to the drive device 420. This portion of the water serves as a power source, driving the drive device 420 to operate. The drive device 420 is typically designed as a mechanical device or apparatus that drives the screw 430 to rotate, utilizing the pressure and kinetic energy of the water flow to convert into rotational mechanical energy of the drive device 420. The drive unit 420 is mounted on the rotating frame 410, and its rotational power is output to the screw 430. The screw 430 rotates, causing the third pipe 370 to move linearly. Another branch of the branch pipe 360 ​​flows into the third pipe 370, and then sprays out through the nozzle 380. The third pipe 370 is connected to the screw 430 via a suitable threaded drive seat 390. The operator controls the rotating frame 410 to rotate it downwards, so that the nozzle 380 is precisely oriented towards the inner surface of the water curtain 20, i.e., the side facing the inside of the greenhouse, and adjusts it so that the water outlet direction of the nozzle 380 is basically perpendicular to the inner surface of the water curtain. When the water flows through the third pipe 370 to the nozzle 380, it forms a high-speed, concentrated water column or mist, which is sprayed vertically onto the inner surface of the water curtain. Simultaneously, the screw 430 rotates at a uniform speed under the drive unit 420. Since the third pipe 370 and the screw 430 are driven by each other, the rotational motion of the screw 430 is converted into uniform linear motion of the third pipe 370 and its end nozzle 380 along the screw axis, which is usually designed to be perpendicular to the direction of the screw. Therefore, while spraying water downwards, the nozzle 380 also moves uniformly downwards under the drive of the screw 430.

[0025] The aforementioned motion process produces the following technical effects: First, it enhances the quality of the water curtain: the vertically sprayed water from the nozzle 380 impacts the inner surface of the water curtain, more effectively wetting the material and allowing the water to penetrate deeper and spread laterally, significantly improving the uniformity, coverage area, and saturation of the water curtain, thereby increasing its evaporative cooling efficiency. Second, it enables automatic rinsing and cleaning: the high-speed vertically sprayed water generates a powerful impact on the inner surface of the water curtain. This impact effectively washes away and removes dust, algae, impurities, and scale adhering to the inner walls and surface of the water curtain pores. Simultaneously, the uniform downward movement of the nozzle 380 ensures that the entire inner surface of the water curtain is rinsed evenly and thoroughly. The washed-off dirt falls into the bottom water tank 10 with the water flow. This process achieves efficient and automated cleaning of the water curtain.

[0026] In another implementation, such as Figure 1 , Figure 2 As shown, the drive unit 420 includes a gearbox 4201 mounted on a rotating frame 410, an impeller 4202 and a gear set 4203 assembled inside the gearbox 4201. The end of the screw 430 is fitted into the gearbox 4201 and connected to the shaft where the gear set 4203 is located. The impeller 4202 meshes with the gear set 4203 through a gear transmission relationship. One branch pipe 3601 of the branch pipe 360 ​​is connected to the gearbox 420 of the drive unit 420. The impeller 4202 is aligned with the first pipe 310. Another branch pipe 3602 of the branch pipe 360 ​​is connected to the outlet of the gearbox 4201 and the third pipe 370 by a flexible pipe. When water is supplied to the first pipe 310, a portion of the water flows to the water curtain 20, and another portion of the water enters the two-way pipe 330 through the rotary joint 320. The water then enters the gearbox 4201 through the two-way pipe 330 and is sprayed onto the impeller 4202, which in turn drives the screw 430 to rotate.

[0027] Based on the above, the operator or motor controls the rotating frame 410 to rotate downwards and position it, ensuring that the nozzle 380 is vertically aligned with the inner surface of the water curtain 20. The control system starts the water pump, and water flows upward through the first pipe 310 to the water curtain 20, forming a water curtain inside the water curtain 20. At the same time, a portion of the water flows through the rotary joint 320 into the two-way pipe 330, and then flows from the two-way pipe 330 into the gearbox 4201 of the drive device 420. Specifically, the water flows into the gearbox 4201 through the branch pipe 3601 and is directly sprayed onto the impeller 4202. The water flow impacts the impeller 4202 and causes it to rotate. The rotational power of the impeller 4202 is transmitted through the gear set 4203 meshing with it. The gear set 4203 contains multiple meshing gears for speed reduction. The output gear of the gear set 4203 drives the screw 430 to rotate synchronously. The water flow that enters the gearbox 4201 and impacts the impeller 4202 has its energy partially utilized to drive the impeller 4202 and the gear set 4203, but the water flow itself does not disappear. This part of the water flow is discharged from the branch pipe 3602 at the outlet of the gearbox 4201 into the third pipe 370, and finally is vertically projected onto the water curtain 20 through the nozzle 380.

[0028] It should be further explained that, depending on the size of the greenhouse, two water curtains 20 are often spliced ​​together to form a water curtain group. For example, a greenhouse with a length of 30 meters uses 10 sets of water curtain groups. The first pipe 310 is horizontally set above the water curtain group according to the length of each water curtain group, and the left and right ends of the first pipe 310 are connected to a water curtain 20 respectively. At least two rotating joints 320 are set on the first pipe 310. Each rotating joint 320 corresponds to the top of a water curtain 20. The outlet of each rotating joint 320 is connected to a two-way pipe 330. The rotating frame 410 and the driving device 420 are arranged above the water curtain group to meet the cleaning and efficient use of each water curtain 20.

[0029] It should be further noted that the shape of the rotating frame 410 is consistent with that of the water curtain 20, for example... Figure 1 The water curtain 20 is rectangular, so the rotating frame 410 is also rectangular. The drive device 420 is located at the lower corner of the rotating frame 410. When the rotating frame 410 deflects downwards, the drive device 420 rotates upwards, preventing it from colliding with the first pipe 310. This ensures that the rotating frame 410 is parallel to the inside of the water curtain 20, and that the nozzle 380 sprays water perpendicularly to the direction of the water curtain 20. When the two-way pipe 330 rotates around the rotating joint 320, it carries the second pipe 350 through the water seat 340, and the second pipe 350 carries the rotating frame 410 to rotate relative to the front surface (inner side) of the water curtain 20. In actual assembly, to achieve intelligence, a motor drive can be installed on the rotating frame 410. After the rotating frame 410 is rotated by the motor, the rotating frame 410 drives all parts to rotate to the inner side of the water curtain 20.

[0030] It needs to be further explained that, such as Figure 1 , Figure 2 As shown, for example, if the rotating frame 410 is rectangular, the screw 430 is vertically mounted at one end of the rotating frame 410 via a bearing. The other end of the rotating frame 410 is vertically connected to a guide tube 440 symmetrical to the screw 430. The third pipe 370 is horizontally positioned inside the rotating frame 410. One end of the third pipe 370 extends to one end of the rotating frame 410 and is equipped with a transmission seat 390, which is connected to the screw 430. The other end of the third pipe 370 has a sliding hole that fits onto the guide tube 440. When the rotating frame 410 rotates to be parallel to the inner side of the water curtain 20, the drive device 420 drives the screw 430 to rotate. The screw 430 then drives the transmission seat 390 to move linearly, which in turn drives the third pipe 370 to move linearly downwards relative to the inner side of the water curtain 20. The other end of the third pipe 370 is fitted onto the guide tube 440 via the sliding hole to ensure smooth movement.

[0031] It should be further noted that the gearbox 4201, as well as the gear set 4203 and impeller 4202 inside the gearbox 4201, are made of lightweight plastic, which makes them easy to use water as a power source.

[0032] It needs to be further explained that, such as Figure 2 , Figure 3 As shown, a solenoid directional valve 3501 is installed on the second pipe 350. A branch pipe 3502 is connected to the solenoid directional valve 3501. Branch pipe 3601 and branch pipe 3502 are connected to the solenoid directional valve 3501. The other end of branch pipe 3502 is connected to the outlet end of the gearbox 4201. Two limit switches 4101 are installed on the rotating frame 410. One limit switch 4101 is close to one end of the screw 430, and the other limit switch 4101 is close to the other end of the screw 430.

[0033] Under normal conditions, water first enters the solenoid reversing valve 3501 from the second pipe 350, then enters the gearbox 4201 through the branch pipe 3601 and is sprayed onto the impeller 4202. This causes the impeller 4202 to drive the screw 430 to rotate, which in turn drives the transmission seat 390 to move linearly. The transmission seat 390 then drives the third pipe 370 to move linearly, for example, from top to bottom (the third pipe 370, carrying the nozzle 380, moves from top to bottom along the inner surface of the water curtain 20). At this time, some water flows from the outlet end of the gearbox 4201. Branch pipe 2 3602 discharges into the third pipe 370, and finally sprays water vertically onto the water curtain 20 through the nozzle 380. When the third pipe 370 travels to the vicinity of the limit switch 4101 on the bottom side of the rotating frame 410, the limit switch 4101 on the bottom side triggers a signal and feeds the signal back to the controller. The controller then controls the solenoid reversing valve 3501 to switch the passage to branch pipe 3502. At this time, branch pipe 2 3602 is closed, and water is introduced into the opposite direction of gearbox 4201 through branch pipe 3502. The water is sprayed directly onto the impeller 4202, causing the impeller 4202 to drive the screw 430 to rotate in the opposite direction. The screw 430 then drives the transmission seat 390 to move in a reverse linear motion, which in turn drives the third pipe 370 to move in a reverse linear motion, for example, from bottom to top (the third pipe 370, carrying the nozzle 380, moves from bottom to top from the inside of the water curtain 20). At this time, some water will also flow from the outlet of the gearbox 4201 into the third pipe 370, and can also be sprayed vertically onto the water curtain 20 through the nozzle 380, until the third pipe... When the channel 370 moves upward to the vicinity of the limit switch 4101 on the top side of the rotating frame 410, the limit switch 4101 on the top side triggers a signal and feeds the signal back to the controller. The controller then controls the solenoid reversing valve 3501 to switch the passage back to the branch pipe 3602. By using the travel position of the third pipe 370, the upper and lower limit switches 4101 are triggered to switch the two-way control mode of the solenoid reversing valve 3501. This enables the third pipe 370 to achieve intelligent control for the vertical cleaning of the water curtain 20, thereby improving cleaning efficiency.

[0034] It should be further explained that the third pipe 370 is equipped with several nozzles 380, which are evenly distributed along the length of the third pipe 370. As the third pipe 370 moves up and down, these nozzles 380 increase the spray range of the water curtain 20, achieving spraying without dead angles.

[0035] It should be further noted that branch pipe 3602 uses a flexible pipe to accommodate the synchronous displacement of the third pipe 370 during its movement.

[0036] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0037] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A smart agricultural greenhouse, characterized in that, The system includes a greenhouse body, a water trough (10) located at the bottom of one side of the greenhouse body, a water curtain (20) located above the water trough (10), a pipe system (30) connected to the water curtain (20), and a control system (40). The pipe system (30) includes a first pipe (310) connected from the water trough (10) to the top of the water curtain (20). The first pipe (310) has a rotary joint (320) on its pipe. The pipe system (30) also includes a two-way pipe (330) connected to the rotary joint (320). The other end of the two-way pipe (330) is connected to a water seat (340). The outlet end of the water seat (340) is connected to a second pipe (350). The upper part is connected to a branch pipe (360). The control system (40) includes a rotating frame (410) connected to the second pipe (350) and a drive device (420) set on the rotating frame (410). One branch of the branch pipe (360) is connected to the drive device (420), and the other branch is connected to a third pipe (370). The third pipe (370) is provided with a nozzle (380). The control system (40) also includes a screw (430) driven by the drive device (420). The third pipe (370) is driven by the screw (430). The third pipe (370) sprays water from top to bottom relative to the surface of the water curtain (20) under the drive of the screw (430). The shape of the rotating frame (410) is consistent with that of the water curtain (20). When the two-way pipe (330) rotates around the rotating joint (320), it carries the second pipe (350) through the water seat (340), and the second pipe (350) carries the rotating frame (410) to rotate relative to the front surface of the water curtain (20). The screw (430) is vertically mounted on one end of the rotating frame (410) via a bearing. The other end of the rotating frame (410) is vertically connected to a guide tube (440) symmetrical to the screw (430). The third pipe (370) is horizontally arranged inside the rotating frame (410). One end of the third pipe (370) extends to one end of the rotating frame (410) and is provided with a transmission seat (390). The transmission seat (390) is connected to the screw (430). The other end of the third pipe (370) is provided with a sliding hole, which is fitted onto the guide tube (440).

2. The smart agricultural greenhouse according to claim 1, characterized in that, Two water curtains (20) are spliced ​​together to form a water curtain group. The first pipe (310) is horizontally set above the water curtain group, and the left and right ends of the first pipe (310) are respectively connected to a water curtain (20). At least two rotary joints (320) are set on the first pipe (310). Each rotary joint (320) corresponds to the top of a water curtain (20), and the outlet of each rotary joint (320) is connected to a two-way pipe (330).

3. The smart agricultural greenhouse according to claim 2, characterized in that, The drive unit (420) includes a gearbox (4201) mounted on a rotating frame (410) and an impeller (4202) and a gear set (4203) assembled inside the gearbox (4201). The end of the screw (430) is fitted into the gearbox (4201) and connected to the shaft where the gear set (4203) is located. The impeller (4202) meshes with the gear set (4203) through a gear transmission relationship. One branch pipe (3601) of the branch pipe (360) is connected to the gearbox (4201) of the drive unit (420). Inside the gearbox (4201) and aligned with the impeller (4202), another branch pipe (3602) of the branch pipe (360) is connected to the outlet of the gearbox (4201) and the third pipe (370) by a flexible pipe. When water is supplied to the first pipe (310), part of the water flows to the water curtain (20), and the other part of the water enters the two-way pipe (330) through the rotary joint (320), enters the gearbox (4201) through the two-way pipe (330) and is sprayed onto the impeller (4202) to convert the impeller (4202) into the impeller (4202) driving the screw (430) to rotate.

4. A smart agricultural greenhouse according to claim 3, characterized in that, The gearbox (4201), as well as the gear set (4203) and impeller (4202) within the gearbox (4201), are made of lightweight plastic.

5. A smart agricultural greenhouse according to claim 4, characterized in that, A solenoid directional valve (3501) is installed on the second pipe (350). A branch pipe (3502) is connected to the solenoid directional valve (3501). Branch pipe (3601) and branch pipe (3502) are connected to the solenoid directional valve (3501). The other end of branch pipe (3502) is connected to the outlet end of the gearbox (4201). Two limit switches (4101) are installed on the rotating frame (410). One limit switch (4101) is close to one end of the screw (430), and the other limit switch (4101) is close to the other end of the screw (430).

6. A smart agricultural greenhouse according to claim 5, characterized in that, The third pipe (370) is provided with several nozzles (380), which are evenly distributed along the length of the third pipe (370).

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