Metering equipment for agricultural water

Abstract

The invention discloses agricultural water metering equipment, and relates to the technical field of agricultural water metering, the agricultural water metering equipment comprises a transmission mechanism, the transmission mechanism is externally connected with a metering mechanism, the metering mechanism is an independently closed water circulation metering system, and the transmission mechanism and the metering mechanism are in a proportional transmission relationship. According to the metering equipment for the agricultural water, the metering mechanism which is in proportional transmission relation with the transmission mechanism is externally erected, so that the metering equipment can be mounted at any place where the metering equipment is convenient to mount, and the mounting process is more flexible; metering of agricultural water is isolated through a transmission mechanism, indirect metering is achieved, and the adverse effects that metering is not accurate and damage is prone to occurring due to dirt when a flowmeter is directly used for agricultural water are avoided; in addition, a water circulation system which is independently sealed by a metering mechanism is adopted, so that the interference of bubbles, vortexes and other fluid phenomena on a measurement result is avoided to the greatest extent, and the flowmeter is easier to calibrate and demarcate in a subsequent use process.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural water metering, in particular to agricultural water metering equipment. Background Art

[0002] Agricultural water metering technology plays a vital role in modern agricultural management. It not only helps to rationally allocate and utilize water resources, but also improves the yield and quality of crops.

[0003] In addition to using pipelines for water transportation and irrigation, agricultural water, such as outdoor farmland planting, is not the same as indoor water supply methods such as greenhouse planting. Most of them use ditches to divert water, including: (1) After agricultural water is accurately measured and supplied, the amount of agricultural water may vary due to factors such as season, weather, and irrigation demand. For example, rainy weather may increase the water flow in the ditch, resulting in obvious irrigation errors. (2) Because it is an open-air environment, especially an open channel, there is garbage and dirt in the water. Using a flow meter to directly measure the water in the ditch will also result in measurement errors, and the flow meter will be aggravated in this usage state.

[0004] In order to solve the above problems, we propose a metering device for agricultural water. Summary of the invention

[0005] [Technical issues solved] In view of the shortcomings of the prior art, the present invention provides a metering device for agricultural water use, which has the advantages of indirect closed metering, no restrictions on scenarios, flexible installation, etc., and can effectively solve the problems in the background technology.

[0006]

Technical solution

[0007] Preferably, the transmission mechanism is put into an agricultural ditch. When the transmission mechanism is used in an agricultural water supply pipeline, the transmission mechanism can be directly connected to the agricultural water supply pipeline. The metering mechanism is fixedly mounted on the outside and can be installed in any convenient position, thereby making the metering equipment more applicable.

[0008] Preferably, the metering mechanism includes a bin two and a circulation pipe, the head and tail ends of the circulation pipe are connected to and communicate with the bin two, an impeller is arranged inside the bin two, a driving wheel fixedly connected to the impeller is arranged outside the bin two, a flow meter connected to the circulation pipe is arranged on the circulation pipe, and the inside of the circulation pipe is filled with liquid.

[0009] Preferably, the transmission mechanism includes a bin one, which is provided with a liquid inlet allowing water to flow through, an impeller is also provided inside the bin one, and a driving wheel fixedly connected to the impeller located therein is also provided outside the bin one, a connecting rod is provided between the driving wheel connected to the impeller on the metering mechanism and the driving wheel connected to the impeller on the transmission mechanism, and the head and tail ends of the connecting rod are respectively rotatably connected to the two driving wheels.

[0010] Preferably, warehouse two is a circular closed warehouse, which is compatible with the structure of the impeller. The impeller is rotatably connected to the inside of warehouse two. The structural size of warehouse two is not too large than the impeller to ensure the normal operation and effectiveness of the impeller. The two ends of the circulation pipe are fixedly connected to warehouse two and communicate with it. The circulation pipe is a hard pipe. The metering mechanism is fixed to the outside based on warehouse two or the circulation pipe as a whole. The two ends of the flow meter are fixedly connected to warehouse two or the circulation pipe through flanges.

[0011] Preferably, an eccentric shaft is provided on the driving wheel, and the driving wheel is rotationally connected to the connecting rod based on the eccentric shaft.

[0012] Preferably, similar to the above-mentioned chamber 2, the impeller in chamber 1 should also be compatible with its structure, so as to ensure the normal operation and effectiveness of the impeller in chamber 1 to the greatest extent. The liquid inlet on chamber 1 is opened at the bottom of chamber 1.

[0013] Preferably, the liquid in the circulation pipe is in a full pipe state, and at this time the flow meter can be connected to any section of the circulation pipe without limiting the installation position.

[0014] Preferably, the liquid in the second bin and the circulation pipe can be pure water to extend the service life of the flow meter.

[0015] Preferably, when the liquid in the circulation pipe is not full, the flow meter is arranged on the side of the second bin adjacent to the flow direction of the liquid therein, wherein the filling basis of the liquid based on the minimum liquid level minL is that the liquid fills the inside of the flow meter in a static state, such as Figure 5 In the structural state shown, the flow meter can always be kept in a full pipe state to ensure the normal measurement accuracy of the flow meter.

[0016] Preferably, the circulation pipe is of a ring-like structure, the circulation pipe is erected in a vertical direction based on the flow direction of the liquid therein, and the second bin is located at the bottom of the circulation pipe.

[0017] Preferably, the circulation pipe should be arranged to avoid excessive wrinkles to ensure normal flow of liquid therein when the pipe is not full. When the circulation pipe is in a vertically erected state, it can also ensure that the flow meter is always in a full pipe state.

[0018] Preferably, a speed changing mechanism is arranged between the transmission mechanism and the metering mechanism, for adaptively changing the transmission ratio of the transmission mechanism and the metering mechanism based on the change in the liquid level of water flowing through the transmission mechanism, and a driving mechanism is arranged on the transmission mechanism, and the driving mechanism changes the transmission ratio of the speed changing mechanism after being affected by the change in the liquid level.

[0019] Preferably, the speed change mechanism is arranged on the transmission mechanism, adjacent to the driving mechanism, so as to reduce the triggering stroke of the driving mechanism, thereby ensuring the overall response sensitivity and accuracy of the metering device.

[0020] Preferably, the speed change mechanism includes a moving gear shaft and a fixed gear shaft, the fixed gear shaft is fixedly connected to the driving wheel on the transmission mechanism, and at least two groups of gears with different structural sizes are arranged on the moving gear shaft and the fixed gear shaft, and the two groups of gears can mesh with each other.

[0021] Preferably, the driving mechanism includes a buoyancy member, which is connected to a guide rail, a guide rod is arranged inside the guide rail, the guide rail is used to guide the guide rod to move, a key shaft is arranged between the guide rod and the moving gear shaft, the key shaft is rotatably connected to the guide rod, and the key shaft is fixedly connected to the moving gear shaft, and the moving gear shaft is connected to the impeller key in the transmission mechanism via the key shaft.

[0022] Preferably, the multiple groups of gears on the moving gear shaft and the fixed gear shaft are arranged in stages from large to small based on the axial direction of their respective corresponding shafts, and the multiple groups of gears are fixedly connected to their respective corresponding shafts, wherein the end of the fixed gear shaft away from the driving wheel is rotatably connected to the warehouse through a bearing.

[0023] Preferably, in order to ensure the driving stability of the driving mechanism, the buoyancy member is cylindrical, and the end thereof in contact with the water surface should be as flat as possible.

[0024] Preferably, the buoyancy member is mounted on one side outside of bin one, a limit rod one is provided on bin one, a limit rod two is provided in the moving direction of the buoyancy member, the limit rod two is matched with the structure of the limit rod one and can slide therewith, the guide rail is fixedly connected to the end of the limit rod two away from the buoyancy member, one end of the guide rod is located inside the guide rail and matched with its structure, the other end of the guide rod extends to the position of the key shaft and is rotatably connected thereto through a bearing, and the key shaft is fixedly connected to the end of the moving gear shaft away from the driving wheel.

[0025] Preferably, the key shaft is a spline shaft, which is key-connected to the impeller on the transmission mechanism through the splines provided on the spline shaft.

[0026] Preferably, a transparent portion is provided on the second bin or the circulation pipe, through which the liquid filling condition inside the second bin and the circulation pipe can be observed.

[0027] Preferably, the transparent portion is opened by the second bin, a transparent plate is provided at the transparent portion, and the transparent plate is embedded in the second bin and fixedly connected thereto.

[0028]

Beneficial Effects

[0029] Figure 1 This is a schematic diagram of the overall structure of an agricultural water metering device according to the present invention.

[0030] Figure 2 The present invention is a schematic diagram of the structure of a metering mechanism in an agricultural water metering device.

[0031] Figure 3 This is a structural analysis diagram of a metering mechanism in an agricultural water metering device of the present invention.

[0032] Figure 4 It is a schematic diagram of the minimum liquid level minL of a metering mechanism in a metering device for agricultural water use according to the present invention.

[0033] Figure 5 The present invention is a schematic diagram of the structure of a transmission mechanism and a driving mechanism in a metering device for agricultural water.

[0034] Figure 6 This is a partial structural analysis diagram of a metering device for agricultural water use according to the present invention.

[0035] Figure 7 The present invention is a schematic structural diagram of a speed change mechanism in an agricultural water metering device.

[0036] Figure 8 The present invention is a side view of an overall agricultural water metering device.

[0037] In the figure: 1. Transmission mechanism; 2. Measuring mechanism; 3. Speed ​​change mechanism; 4. Driving mechanism; 11. Warehouse 1; 12. Liquid port; 111, limit rod one; 21. Bin 2; 22. Circulation pipe; 23. Impeller; 24. Flow meter; 25. Driving wheel; 26. Connecting rod; 211, transparent plate; 221, water inlet and outlet; 31. Moving gear shaft; 32. Fixed gear shaft; 41. buoyancy member; 42. guide rail; 43. guide rod; 44. key shaft; 411. Limit rod 2. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and functional effects of the present invention easy to understand, the present invention will be further described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] [Example 1] In order to address the shortcomings of the existing technology, such as Figure 1 As shown, the present invention provides a metering device for agricultural water, including a transmission mechanism 1 subjected to agricultural water, the transmission mechanism 1 is externally connected to a metering mechanism 2, the metering mechanism 2 is a separate closed water circulation metering system, the transmission mechanism 1 and the metering mechanism 2 are in a proportional transmission relationship, based on this proportional transmission relationship, the metering mechanism 2 measures the water flowing through the transmission mechanism 1; In this embodiment, Figure 1 The difference shown is that the metering mechanism 2 is directly subject to the transmission effect of the transmission mechanism 1.

[0040] The transmission mechanism 1 is put into the agricultural ditch. When the transmission mechanism 1 is used in the agricultural water supply pipeline, the transmission mechanism 1 can be directly connected to the agricultural water supply pipeline. The metering mechanism 2 is fixedly mounted on the outside and can be installed in any convenient position, thereby making the metering equipment more applicable.

[0041] It should be noted that if agricultural water needs to be metered or measured, the transmission mechanism 1 needs to be placed in the canal or installed at the location where it should be installed, and then the metering mechanism 2 is fixed and installed so that normal transmission is maintained between the metering mechanism 2 and the transmission mechanism 1; In the process of metering or measuring agricultural water, the agricultural water flows through the transmission mechanism 1 and acts on the transmission mechanism 1, so that the transmission mechanism 1 drives the metering mechanism 2 to operate. The flow rate between the transmission mechanism 1 and the metering mechanism 2 is in a proportional relationship. By obtaining the flow data of the metering mechanism 2 and combining it with a certain ratio set in advance, the flow rate through the transmission mechanism 1 can be indirectly measured to achieve the metering or measurement of agricultural water.

[0042] Specifically, as shown in Figures 2 to 6, a transmission mechanism 1 and a metering mechanism 2 are used for metering equipment for agricultural water. The second chamber 21 is a circular closed chamber, which is consistent with the structure of the impeller 23. The impeller 23 is rotatably connected to the inside of the second chamber 21. The structural size of the second chamber 21 is not too large than the impeller 23 to ensure the normal operation and effectiveness of the impeller 23. The two ends of the circulation pipe 22 are fixedly connected to the second chamber 21 and communicate with it. The circulation pipe 22 is a hard pipe. The metering mechanism 2 is fixed to the outside based on the second chamber 21 or the circulation pipe 22. The two ends of the flow meter 24 are fixedly connected to the second chamber 21 or the circulation pipe 22 through flanges. An eccentric shaft is provided on the driving wheel 25, and the driving wheel 25 is rotatably connected to the connecting rod 26 based on the eccentric shaft; The liquid is filled through the circulation pipe 22 or the water inlet and outlet 221 opened on the second bin 21; Similar to the second chamber 21 , the impeller 23 in the first chamber 11 should also be compatible with its structure, so as to maximize the normal operation and effectiveness of the impeller 23 in the first chamber 11 . The liquid inlet 12 on the first chamber 11 is opened at the bottom of the first chamber 11 .

[0043] The liquid in the circulation pipe 22 is full, and the flow meter 24 can be connected to any section of the circulation pipe 22 without limiting the installation position. The liquid in the second bin 21 and the circulation pipe 22 can be pure water to extend the service life of the flow meter 24. When the liquid in the circulation pipe 22 is not full, the flow meter 24 is arranged on the side of the second chamber 21 adjacent to the flow direction of the liquid therein, wherein the filling basis of the liquid based on the minimum liquid level minL is that the liquid fills the inside of the flow meter 24 in a static state, such as Figure 5 In the structural state shown, the flow meter 24 can always be kept in a full pipe state to ensure the normal measurement accuracy of the flow meter 24.

[0044] It should be noted that the present invention is a metering device for agricultural water. Through the transmission mechanism 1 and the metering mechanism 2, in the process of metering or measuring agricultural water, the water flow drives the impeller 23 in the bin 11 to rotate. During the rotation of the impeller 23 in the bin 11, the driving wheel 25 connected thereto is driven to rotate. During the rotation of the driving wheel 25, the driving wheel 25 on the metering mechanism 2 is driven to rotate through the connecting rod 26. When the driving wheel 25 on the metering mechanism 2 rotates, it drives the impeller 23 located inside the second bin 21 to rotate, and the impeller 23 then drives the liquid in the second bin 21 to flow and circulate through the circulation pipe 22. The water in the circulation pipe 22 continuously passes through the flow meter 24, thereby measuring the water flow in the circulation pipe 22 and the second bin 21.

[0045] It is worth mentioning that by externally setting up the metering mechanism 2 which is in a proportional transmission relationship with the transmission mechanism 1, it can be installed in any convenient place, making the installation process more flexible and more convenient for subsequent targeted operation and maintenance of the metering equipment; The transmission mechanism 1 is used to isolate the measurement of agricultural water, thus realizing indirect measurement, avoiding the adverse effects of measurement inaccuracy and easy damage caused by the flow meter being directly used for agricultural water, greatly reducing the maintenance frequency, and ensuring the service life and measurement accuracy of the flow meter to the greatest extent; In addition, the separate closed water circulation system of the metering mechanism 2 avoids the interference of bubbles, eddies and other fluid phenomena on the measurement results to the greatest extent, making it easier to calibrate and calibrate the flow meter during subsequent use, ensuring the long-term consistency of the measurement results.

[0046] As a preferred embodiment, the circulation pipe 22 is in a ring-like structure, and the circulation pipe 22 is installed based on the vertical direction of the liquid flow therein, and the bin 21 is located at the bottom of the circulation pipe 22; the setting of the circulation pipe 22 should avoid excessive wrinkles to ensure the normal flow of the liquid therein when the pipe is not full. When the circulation pipe 22 is in a vertically installed state, it can also ensure that the flow meter 24 is always in a full pipe state.

[0047] As mentioned above, in this embodiment, since the metering mechanism 2 is a separate closed water circulation system, those skilled in the art can understand that a suitable flow meter can be selected according to actual usage requirements, rather than being limited to using only a certain type of flow meter for measurement in a specific usage scenario.

[0048] [Example 2] Considering that the liquid level of agricultural water may vary due to factors such as seasons, weather, and irrigation needs, and that different liquid level heights have different water flow rates at the same flow rate, in order to improve the measurement accuracy of water flow and enable the metering equipment to adapt to different liquid level heights during the metering process, this embodiment is proposed based on the above embodiments: Specifically, Figures 5 to 8 As shown, a speed change mechanism 3 and a driving mechanism 4 for a metering device for agricultural water use, the speed change mechanism 3 is arranged on the transmission mechanism 1, adjacent to the driving mechanism 4, so as to reduce the triggering stroke of the driving mechanism 4, thereby ensuring the overall response sensitivity and accuracy of the metering device; Multiple sets of gears are fixedly connected to their respective corresponding shafts, wherein the end of the fixed gear shaft 32 away from the driving wheel 25 is rotatably connected to the warehouse 11 through a bearing; the buoyancy member 41 is spherical, and in order to ensure the driving stability of the driving mechanism 4, the buoyancy member 41 is preferably cylindrical, and the end thereof in contact with the water surface should be as flat as possible; The buoyancy member 41 is mounted on one side of the exterior of the warehouse 11, a limiting rod 111 is provided on the warehouse 11, and a limiting rod 2 411 is provided in the moving direction of the buoyancy member 41, the limiting rod 2 411 is in conformity with the structure of the limiting rod 111 and can slide therewith, the guide rail 42 is fixedly connected to the end of the limiting rod 2 411 away from the buoyancy member 41, one end of the guide rod 43 is located inside the guide rail 42 and in conformity with its structure, the other end of the guide rod 43 extends to the position of the key shaft 44 and is rotatably connected therewith through a bearing, and the key shaft 44 is fixedly connected to the end of the movable gear shaft 31 away from the driving wheel 25; The key shaft 44 is a spline shaft, and forms a key connection with the impeller 23 on the transmission mechanism 1 through the splines provided on the key shaft.

[0049] It should be noted that the present invention is a metering device for agricultural water, which is configured with a speed change mechanism 3 and a drive mechanism 4 as an initial structural state. Figure 8 As shown, the height of the buoyancy member 41 is set based on the fact that the bottom end of the buoyancy member 41 is in direct contact with the placement surface under the condition of zero water level; In the process of metering or measuring agricultural water, in this embodiment, the metering of ditch water is taken as an example. If the liquid level of flowing water in the ditch changes, the height of the buoyancy member 41 changes with the change of the liquid level. In the process of the height change of the buoyancy member 41, the buoyancy member 41 exerts force on the guide rod 43 through the guide rail 42. When the guide rod 43 is subjected to force, it drives the key shaft 44 to move based on its axial direction, so that the key shaft 44 drives the movable gear shaft 31 to mesh with the fixed gear shaft 32 to different degrees. As the meshing relationship between the gears on the moving gear shaft 31 and the fixed gear shaft 32 changes, the output speed of the fixed gear shaft 32 changes, so that the driving wheel 25 on the transmission mechanism 1 and the driving wheel 25 on the metering mechanism 2 form a transmission relationship of a certain proportion, and as the speed of the driving wheel 25 on the transmission mechanism 1 changes, the speed of the driving wheel 25 on the metering mechanism 2 also changes, thereby changing the fluid flow rate in the circulation pipe 22 and the bin 21.

[0050] It can be understood by those skilled in the art that a group of gears with the same structural dimensions can be mounted on the movable gear shaft 31 and the fixed gear shaft 32, and this group of gears with the same structural dimensions constitutes a transmission relationship between the transmission mechanism 1 and the metering mechanism 2 under a water flow condition of a reference liquid level during the process of metering or measuring agricultural water; Among them, although the gear modules of different groups on the movable gear shaft 31 and the fixed gear shaft 32 are different, each gear on the movable gear shaft 31 and each gear on the fixed gear shaft 32 should be on the same axial direction of the corresponding shaft, such as Figure 7 The structural state shown, and in order to enable the flow meter 24 to measure more liquid level levels, it means that it is necessary to set multiple sets of mutually meshing gears on the movable gear shaft 31 and the fixed gear shaft 32, and the gears on the single shaft are arranged step by step from large to small.

[0051] It is worth mentioning that by adding a speed change mechanism 3 between the transmission mechanism 1 and the metering mechanism 2, the speed change mechanism 3 is driven by the driving mechanism 4 to change, and the driving mechanism 4 changes the transmission ratio of the speed change mechanism 3 between the transmission mechanism 1 and the metering mechanism 2 as the liquid level of agricultural water changes, so that the metering equipment can measure the water flow at different liquid levels at the same flow rate. It is more suitable for ditches, pipes and water bodies of various shapes and sizes, and has a wide range of applicability.

[0052] As a preferred embodiment, a transparent portion is provided on the warehouse 21 or the circulation pipe 22, through which the liquid filling conditions inside the warehouse 21 and the circulation pipe 22 can be observed; the transparent portion is opened by the warehouse 21, and a transparent plate 211 is provided on the transparent portion, and the transparent plate 211 is embedded in the warehouse 21 and fixedly connected thereto.

[0053] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed for protection.

Claims

1. A metering device for agricultural water, characterized in that: The invention comprises a transmission mechanism (1) subjected to force from agricultural water, wherein a metering mechanism (2) is externally connected to the transmission mechanism (1), and the metering mechanism (2) is a separate closed water circulation metering system. There is a proportional transmission relationship between the transmission mechanism (1) and the metering mechanism (2). Based on the proportional transmission relationship, the metering mechanism (2) measures the water flowing through the transmission mechanism (1).

2. The agricultural water metering device according to claim 1, characterized in that: The metering mechanism (2) comprises a second chamber (21) and a circulation pipe (22), the first and second ends of the circulation pipe (22) being connected to the second chamber (21) and in communication with each other, an impeller (23) being arranged inside the second chamber (21), a driving wheel (25) being fixedly connected to the impeller (23) being arranged outside the second chamber (21), a flow meter (24) being arranged on the circulation pipe (22) and in communication with the circulation pipe (22), and a liquid being filled inside the circulation pipe (22); The transmission mechanism (1) comprises a chamber (11), the chamber (11) being provided with a liquid inlet (12) for allowing water to flow therethrough, an impeller (23) being arranged inside the chamber (11), and a driving wheel (25) being fixedly connected to the impeller (23) located therein being arranged outside the chamber (11), a connecting rod (26) being arranged between the driving wheel (25) connected to the impeller (23) on the metering mechanism (2) and the driving wheel (25) connected to the impeller (23) on the transmission mechanism (1), and the head and tail ends of the connecting rod (26) being rotatably connected to the two driving wheels (25) respectively.

3. The agricultural water metering device according to claim 2, characterized in that: The liquid in the circulation pipe (22) is in a full pipe state.

4. The agricultural water metering device according to claim 3, characterized in that: When the liquid in the circulation pipe (22) is not full, the flow meter (24) is arranged on the side of the second bin (21) adjacent to the flow direction of the liquid therein, wherein the filling of the liquid based on the minimum liquid level minL is based on the fact that the liquid fills the interior of the flow meter (24) in a static state.

5. The agricultural water metering device according to claim 4, characterized in that: The circulation pipe (22) is of a quasi-annular structure. The circulation pipe (22) is erected in a direction vertical to the flow direction of the liquid therein, and the second bin (21) is located at the bottom end of the circulation pipe (22).

6. The agricultural water metering device according to claim 5, characterized in that: A speed change mechanism (3) is provided between the transmission mechanism (1) and the metering mechanism (2), and is used to adaptively change the transmission ratio of the transmission mechanism (1) and the metering mechanism (2) based on changes in the liquid level of water flowing through the transmission mechanism (1). A drive mechanism (4) is provided on the transmission mechanism (1), and the drive mechanism (4) changes the transmission ratio of the speed change mechanism (3) after being affected by changes in the liquid level.

7. The agricultural water metering device according to claim 6, characterized in that: The speed change mechanism (3) comprises a movable gear shaft (31) and a fixed gear shaft (32); the fixed gear shaft (32) is fixedly connected to a driving wheel (25) on the transmission mechanism (1); at least two groups of gears with different structural sizes are provided on the movable gear shaft (31) and the fixed gear shaft (32), and the two groups of gears can mesh with each other; The driving mechanism (4) comprises a buoyancy member (41), the buoyancy member (41) being connected to a guide rail (42), a guide rod (43) being arranged inside the guide rail (42), the guide rail (42) being used to guide the guide rod (43) to move, a key shaft (44) being arranged between the guide rod (43) and the movable gear shaft (31), the key shaft (44) being rotatably connected to the guide rod (43), the key shaft (44) being fixedly connected to the movable gear shaft (31), and the movable gear shaft (31) being key-connected to an impeller (23) in the transmission mechanism (1) via the key shaft (44).

8. The agricultural water metering device according to claim 7, characterized in that: A transparent portion is provided on the second chamber (21) or the circulation pipe (22).

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