Forestry tree irrigation device
By installing rotating irrigation devices on the outside of trees, the problems of easy clogging and irrigation blind spots of buried sprinklers are solved, achieving uniform coverage of tree roots, promoting healthy tree growth and effective use of water resources.
Patent Information
- Application Number
- CN202511526345.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-24
- Publication Date
- 2025-12-12
AI Technical Summary
Existing forestry tree irrigation devices are easily clogged by soil, sand, and roots, resulting in low water output efficiency and irrigation blind spots, failing to evenly cover tree roots and affecting tree growth.
Design a uniform irrigation structure including a bottom support unit, a water flow distribution unit, a rotating irrigation unit, and a water flow drive unit, which is set on the outside of the tree. The rotating irrigation unit achieves 360-degree uniform spraying, avoiding clogging and covering the entire root system.
It improved the stability and water output efficiency of the irrigation system, eliminated irrigation blind spots, promoted the balanced development of tree roots, and enhanced irrigation effect and water resource utilization.
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Figure CN121100775A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of forestry irrigation, in particular to a forestry tree irrigation device. BACKGROUND
[0002] In the forestry resource cultivation and ecological restoration engineering, effective irrigation of trees is the core technical link to guarantee the survival rate and promote the healthy growth of trees. However, the tree irrigation devices commonly used in the current forestry field are mostly of buried design. The soil in the forest land is rich in humus, sand, fallen leaves and active plant roots. The buried nozzle is in this environment for a long time during the non-irrigation period. Its water outlet hole is easily extruded by soil, invaded by small particles or blocked by weed root system. When starting irrigation, the blockage problem not only sharply reduces the water outlet efficiency, causing water resource waste, but also makes the buried nozzle difficult to maintain. The irrigation method has an insurmountable coverage blind area. The spraying range takes the nozzle as the original point and can only cover the surrounding area. For the root zone soil within the vertical projection range of the tree crown, especially the other side of the tree trunk opposite to the nozzle position, water often cannot effectively penetrate and reach, causing a serious "irrigation yin and yang face" phenomenon. The roots near the nozzle side may cause root rot due to excessive water concentration, while the roots far from the nozzle side are in a long-term water stress state. This extreme uneven irrigation directly leads to the abnormal development of tree roots and the imbalance of absorption function, seriously inhibiting the growth rate and quality of the trees. SUMMARY
[0003] The present application aims to provide a forestry tree irrigation device which can solve the problem that the tree irrigation devices commonly used in the current forestry field are mostly of buried design. The soil in the forest land is rich in humus, sand, fallen leaves and active plant roots. The buried nozzle is in this environment for a long time during the non-irrigation period. Its water outlet hole is easily extruded by soil, invaded by small particles or blocked by weed root system. When starting irrigation, the blockage problem not only sharply reduces the water outlet efficiency, causing water resource waste, but also makes the buried nozzle difficult to maintain. The irrigation method has an insurmountable coverage blind area. The spraying range takes the nozzle as the original point and can only cover the surrounding area. For the root zone soil within the vertical projection range of the tree crown, especially the other side of the tree trunk opposite to the nozzle position, water often cannot effectively penetrate and reach.
[0004] The present application provides a forestry tree irrigation device, which comprises a plurality of uniform irrigation structures and a plurality of connecting hoses. The plurality of uniform irrigation structures respectively irrigate a plurality of trees planted according to a predetermined row spacing. Each uniform irrigation structure is arranged outside a tree for uniform irrigation of the tree. Each connecting hose is connected between two adjacent uniform irrigation structures, thereby sequentially distributing irrigation water to the plurality of uniform irrigation structures.
[0005] Preferably, the uniform irrigation structure comprises a bottom support unit for providing stable support for the whole structure, a water flow distribution unit for receiving a water source connected with a connecting hose, a rotating irrigation unit for rotating around the tree to achieve uniform irrigation, and a water flow driving unit for converting kinetic energy into rotational mechanical energy when the water flow distribution unit irrigates to drive the rotating irrigation unit to rotate, the bottom support unit is inserted around the tree, the water flow distribution unit is connected with the bottom support unit, and the water flow distribution unit is also connected with the connecting hose, the rotating irrigation unit is arranged on the bottom support unit, and the water flow driving unit is connected with the water flow distribution unit and the bottom support unit respectively, and the water flow driving unit can drive the rotating irrigation unit.
[0006] Preferably, the bottom support unit comprises a bottom plate, an annular slide, a plurality of columns, a front baffle, a rear baffle, and a top plate, the annular slide is fixedly connected with the bottom plate, and a notch is formed in the annular slide, a plurality of the columns are fixedly arranged at the bottom of the bottom plate and the annular slide, and the plurality of columns are inserted into the soil around the tree, the front baffle and the rear baffle are fixedly arranged on the front and rear sides of the bottom plate respectively, the top plate is fixedly arranged on the top of the front baffle and the rear baffle, and the water flow distribution unit is connected with the front baffle and the rear baffle.
[0007] Preferably, the water flow distribution unit comprises a distribution pipe, a metal pipe, and a water outlet pipe, the distribution pipe is fixedly connected with the front baffle and the rear baffle respectively, and the two ends of the distribution pipe are fixedly connected with the connecting hose respectively, two metal pipes are fixedly arranged on the distribution pipe, and the two metal pipes are connected with the distribution pipe, one end of the water outlet pipe is fixedly connected with the distribution pipe and connected with the distribution pipe, and the water outlet pipe is located between the two metal pipes.
[0008] Preferably, the rotating irrigation unit comprises a plurality of slide rods, a notched gear, and a plurality of irrigation pipes, the bottom ends of the plurality of slide rods are slidingly connected with the annular slide, the bottom of the notched gear is fixedly arranged on the top ends of the plurality of slide rods, the notched gear can rotate in the annular slide through the plurality of slide rods, the top of the notched gear is provided with a water storage groove, the other end of the water outlet pipe corresponds to the water storage groove, and the plurality of irrigation pipes are fixedly arranged on the bottom of the notched gear and connected with the water storage groove.
[0009] Preferably, the water flow driving unit comprises two rotating shafts, two water wheel blades, and two transmission gears, the top ends of the two rotating shafts are connected with the two metal pipes through sealing bearings respectively, and the bottom ends of the two rotating shafts are rotatably connected with the bottom plate, the two water wheel blades are fixedly arranged on the top ends of the two rotating shafts respectively, and the two transmission gears are fixedly sleeved on the two rotating shafts respectively.
[0010] Preferably, the top of the water storage groove is provided with a filter screen.
[0011] Preferably, the gap width of the annular slide notch is equal to the gap width of the notch gear notch.
[0012] Preferably, the centers of the two transmission gears are the same on the axis, and are arranged on the two sides of the notch gear.
[0013] The forestry tree irrigation device provided by the application has the following improvements and advantages compared with the prior art: the uniform irrigation structure of the application is arranged outside the tree and has a certain height from the ground, replaces the traditional buried nozzle, avoids the problem that the buried nozzle is easily blocked by soil, sand and roots, ensures the long-term stable operation and water output efficiency of the irrigation system, is convenient to maintain, and the uniform irrigation structure can rotate around the tree for 360-degree spraying, completely eliminates the irrigation blind area caused by the fixed position of the traditional buried nozzle, ensures that the water can uniformly cover the entire circumferential area of the tree roots, effectively solves the "irrigation sunny and shady sides" phenomenon, promotes the balanced development and healthy growth of the tree roots, and significantly improves the irrigation effect and water resource utilization rate. BRIEF DESCRIPTION OF DRAWINGS
[0014] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0015] Figure 1 is the schematic diagram of the shaft structure of the application in the use state; Figure 2 is the schematic diagram of the shaft structure of the tree and the uniform irrigation structure of the application; Figure 3 is the schematic diagram of the shaft structure of the uniform irrigation structure of the application; Figure 4 is the schematic diagram of the shaft structure of the water flow distribution unit, the water flow driving unit and the rotating irrigation unit of the application; Figure 5 is the schematic diagram of the shaft structure of the bottom support unit of the application; Figure 6 is the schematic diagram of the front view structure of the water flow driving unit of the application; Figure 7 is the schematic diagram of the top view structure of the rotating irrigation unit of the application; Figure 8Fig. 4 is a bottom view of the rotating irrigation unit of the present application.
[0016] BRIEF DESCRIPTION OF DRAWINGS 1, connecting hose; 2, bottom support unit; 21, bottom plate; 22, annular slide; 23, stand; 24, front baffle; 25, rear baffle; 26, top plate; 3, water flow distribution unit; 31, distribution pipe; 32, metal pipe; 33, water outlet pipe; 4, rotating irrigation unit; 41, slide rod; 42, notch gear; 43, irrigation pipe; 44, filter screen; 5, water flow driving unit; 51, rotating shaft; 52, water wheel blade; 53, transmission gear. DETAILED DESCRIPTION
[0017] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.
[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0019] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0020] Please refer to Figures 1-8The application provides the technical scheme: a forestry tree irrigation device, comprising a plurality of uniform irrigation structures and a plurality of connecting hoses 1, the plurality of uniform irrigation structures respectively irrigate a plurality of trees planted according to a predetermined row spacing, each uniform irrigation structure is arranged outside one tree and is used for uniformly irrigating the tree, each uniform irrigation structure corresponds to one tree, and each connecting hose 1 is connected between two adjacent uniform irrigation structures, so that irrigation water is sequentially distributed to the plurality of uniform irrigation structures, the irrigation water can sequentially flow through each uniform irrigation structure from a first end and is finally accurately distributed to each tree, and systematic and uniform irrigation operation of the entire forest planting area is realized.
[0021] Specifically, the uniform irrigation structure comprises a bottom support unit 2 for providing stable support for the entire structure, a water flow distribution unit 3 for receiving a water source of the connecting hose 1, a rotating irrigation unit 4 for rotating around the tree to realize uniform irrigation, and a water flow driving unit 5 for converting kinetic energy of the water flow distribution unit 3 during irrigation into rotary mechanical energy to drive the rotating irrigation unit 4 to rotate, the bottom support unit 2 is inserted around the tree and is used for supporting the water flow distribution unit 3, the water flow driving unit 5 and the rotating irrigation unit 4, the water flow distribution unit 3 is connected with the bottom support unit 2, and the water flow distribution unit 3 is also connected with the connecting hose 1, the rotating irrigation unit 4 is arranged on the bottom support unit 2, and the water flow driving unit 5 is connected with the water flow distribution unit 3 and the bottom support unit 2 respectively, and the water flow driving unit 5 can drive the rotating irrigation unit 4.
[0022] Specifically, the bottom support unit 2 comprises a bottom plate 21, an annular slide 22, a plurality of columns 23, a front baffle 24, a rear baffle 25 and a top plate 26, the annular slide 22 is fixedly connected with the bottom plate 21, and a notch is formed in the annular slide 22, the notch forms a channel through which the tree trunk directly passes, so that the entire bottom support unit 2 can be directly sleeved outside the planted tree through the notch without any disassembly or assembly operation, greatly simplifying the on-site installation process and improving the construction efficiency, the plurality of columns 23 are fixedly arranged at the bottom of the bottom plate 21 and the annular slide 22, and the plurality of columns 23 are inserted into the soil around the tree, the column 23 is fixed by being inserted into the soil, and the stability of the bottom plate 21 and the annular slide 22 during the support process is ensured, the annular slide 22 is used for supporting the rotating irrigation unit 4, the bottom plate 21 is used for supporting the water flow driving unit 5, the front baffle 24 and the rear baffle 25 are fixedly arranged on the front and rear sides of the bottom plate 21 respectively, the top plate 26 is fixedly arranged on the top of the front baffle 24 and the rear baffle 25, the water flow distribution unit 3 is connected with the front baffle 24 and the rear baffle 25, and the front baffle 24 and the rear baffle 25 provide mounting space for the water flow distribution unit 3.
[0023] Specifically, the water flow distribution unit 3 comprises a distribution pipe 31, two metal pipes 32 and an outlet pipe 33, the distribution pipe 31 is fixedly connected with the front baffle 24 and the rear baffle 25 respectively, and the two ends of the distribution pipe 31 are fixedly connected with the connecting hose 1 respectively, the two metal pipes 32 are fixedly arranged on the distribution pipe 31, and the two metal pipes 32 are connected with the distribution pipe 31, one end of the outlet pipe 33 is fixedly connected with the distribution pipe 31, and the two are connected, the outlet pipe 33 is located between the two metal pipes 32, and the distribution pipe 31 and the outlet pipe 33 are used to deliver the irrigation water in the connecting hose 1 to the rotary irrigation unit 4.
[0024] Specifically, the rotary irrigation unit 4 comprises a plurality of slide rods 41, a notched gear 42 and a plurality of irrigation pipes 43, the bottom ends of the plurality of slide rods 41 are slidingly connected with the annular slide 22, the bottom of the notched gear 42 is fixedly arranged at the top end of the plurality of slide rods 41, the notched gear 42 can rotate in the annular slide 22 through the plurality of slide rods 41, the notch on the notched gear 42 forms an open channel, so that the notched gear 42 can wrap around the outside of the grown tree trunk from the side, thereby realizing convenient, non-destructive installation and later maintenance of the formed tree without pre-burying or installing in the initial stage of tree planting, in the initial state, the notch of the annular slide 22 is located at the same position as the notch of the notched gear 42, a water storage groove is opened at the top of the notched gear 42, the other end of the outlet pipe 33 corresponds to the water storage groove, the water storage groove serves as a temporary water storage cavity for receiving and temporarily storing the irrigation water delivered by the outlet pipe, the plurality of irrigation pipes 43 are fixedly arranged at the bottom of the notched gear 42, and the plurality of irrigation pipes 43 are connected with the water storage groove, when the water flow is injected into the water storage groove from the outlet pipe 33, it will flow into the water storage groove due to gravity and then flow out through each irrigation pipe 43 at the bottom simultaneously, thereby uniformly spraying the soil around the tree roots. Regardless of the rotation of the notched gear 42, the water storage groove in the notched gear 42 always maintains a butt joint relationship with the fixed outlet pipe 33.
[0025] Specifically, the water flow driving unit 5 comprises two rotating shafts 51, two water wheel blades 52 and two transmission gears 53, the top ends of the two rotating shafts 51 are connected with the two metal pipes 32 through sealing bearings, the bottom ends of the two rotating shafts 51 are rotationally connected with the bottom plate 21, the sealing bearings allow the rotating shafts 51 to rotate relatively and prevent leakage, ensuring the sealing performance, the two water wheel blades 52 are fixedly arranged at the top ends of the two rotating shafts 51 respectively, the two transmission gears 53 are fixedly sleeved on the two rotating shafts 51 respectively, the two transmission gears 53 are engaged with the notched gear 42, when the water flow flows from the metal pipe 32 and impacts the pressure surface of the blade, the generated thrust can be directly transmitted to the rotating shaft 51, so as to drive the entire rotating shaft 51 and the transmission gear 53 to rotate, the water flow driving unit 5 can convert the power of the water flow into the rotating power of the rotating shaft 51, the transmission gear 53 can drive the notched gear 42 to rotate in the rotating process, so as to make the notched gear 42 rotate around the tree trunk of the tree, and then the tree is uniformly irrigated at 0 degrees.
[0026] Specifically, the top of the water storage groove is provided with a filter screen 44, which can prevent impurities such as leaves from falling into the water storage groove, and a baffle can also be arranged on the top plate 26 according to actual use, recesses can be formed in the baffle, so as to protect the notched gear 42.
[0027] Specifically, the gap width of the gap of the annular slide 22 is equal to the gap width of the gap of the notched gear 42, so that the tree trunk of the tree can pass through the two aligned gaps simultaneously and without obstruction during installation, so that the entire annular irrigation unit is sleeved outside the tree at one time, if the widths of the two are not equal, for example, the gap of the annular slide 22 is too narrow and the gap of the notched gear 42 is too wide, the tree trunk will be stuck by the annular slide 22 during installation, resulting in failure to be in place; on the contrary, if the gap of the annular slide 22 is too wide and the gap of the notched gear 42 is too narrow, the tree trunk can pass through the slide, but will be blocked by the notched gear 42, so the installation cannot be completed.
[0028] Specifically, the centers of the two transmission gears 53 are the same on the axis, and are arranged on the two sides of the notched gear 42, the two transmission gears 53 engaged with the notched gear 42 are aligned in the axial direction and are arranged on the two sides thereof, so as to ensure that when the gap of the notched gear 42 rotates through one transmission gear 53, the other transmission gear 53 can still be engaged to realize continuous transmission.
[0029] Working principle: During installation, the operator lifts the uniform irrigation structure and uses the pre-designed, perfectly equal-width notches on the annular slide 22 of the bottom support unit 2 and the notched gear 42 of the rotating irrigation unit 4 to wrap around the tree trunk from the side. Then, it is placed downwards, so that the annular slide 22 and the column 23 on the base plate 21 are forcefully inserted into the soil around the tree, thus completing the fixation and positioning of the entire structure. The connecting hose 1 can be adjusted in length according to the distance between the trees to ensure normal water delivery.
[0030] After installation, the structure begins to operate automatically. Its working principle involves converting water energy into mechanical energy and achieving uniform spraying: First, irrigation water enters the water distribution unit 3 through the connecting hose 1. The water flow is guided to two metal pipes 32 in the drive unit. As the water flows through the metal pipes 32, it impacts and drives two water turbine blades 52 to rotate. The water turbine blades 52 transmit power to two transmission gears 53 via a rotating shaft 51. The two transmission gears 53 are located on either side of a notched gear 42. When one of the gears disengages due to the notch in the notched gear 42, The other gear remains engaged, ensuring uninterrupted power transmission to the notched gear 42, driving the entire rotating irrigation unit 4 to rotate smoothly around the tree at 0 degrees. Simultaneously, some water from the distribution pipe 31 is continuously injected into the water storage groove at the top of the rotating notched gear 42 through the outlet pipe 33. The water then flows out from multiple irrigation pipes 43 at the bottom of the water storage groove. As the irrigation pipes 43 move in a circular motion with the entire rotating unit, the water is evenly distributed into the soil around the tree roots, ultimately achieving a fully automatic, all-around uniform irrigation effect without the need for external energy.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A forestry tree irrigation device, characterized in that, It includes multiple uniform irrigation structures and multiple connecting hoses (1). The multiple uniform irrigation structures irrigate multiple trees planted according to a predetermined row spacing. Each uniform irrigation structure is set on the outside of a tree for uniform irrigation of the tree. Each connecting hose (1) is connected between two adjacent uniform irrigation structures, thereby distributing irrigation water to the multiple uniform irrigation structures in sequence.
2. The forestry tree irrigation device according to claim 1, characterized in that, The uniform irrigation structure includes a bottom support unit (2) for providing stable support for the entire structure, a water distribution unit (3) for receiving water from the connecting hose (1), a rotating irrigation unit (4) for rotating around the tree to achieve uniform irrigation, and a water flow drive unit (5) for converting the kinetic energy of the water distribution unit (3) during irrigation into rotational mechanical energy to drive the rotating irrigation unit (4) to rotate. The bottom support unit (2) is inserted around the tree. The water distribution unit (3) is connected to the bottom support unit (2) and is also connected to the connecting hose (1). The rotating irrigation unit (4) is disposed on the bottom support unit (2). The water flow drive unit (5) is connected to the water distribution unit (3) and the bottom support unit (2) respectively, and the water flow drive unit (5) can drive the rotating irrigation unit (4).
3. The forestry tree irrigation device according to claim 2, characterized in that, The bottom support unit (2) includes a bottom plate (21), an annular slide (22), multiple columns (23), a front baffle (24), a rear baffle (25), and a top plate (26). The annular slide (22) is fixedly connected to the bottom plate (21), and a notch is provided on the annular slide (22). The multiple columns (23) are fixedly installed at the bottom of the bottom plate (21) and the annular slide (22), and the multiple columns (23) are inserted into the soil around the tree. The front baffle (24) and the rear baffle (25) are fixedly installed on the front and rear sides of the bottom plate (21), respectively. The top plate (26) is fixedly installed on the top of the front baffle (24) and the rear baffle (25). The water flow distribution unit (3) is connected to the front baffle (24) and the rear baffle (25).
4. A forestry tree irrigation device according to claim 3, characterized in that, The water distribution unit (3) includes a distribution pipe (31), a metal pipe (32), and a water outlet pipe (33). The distribution pipe (31) is fixedly connected to the front baffle (24) and the rear baffle (25) respectively, and both ends of the distribution pipe (31) are fixedly connected to the connecting hose (1). The two metal pipes (32) are fixedly installed on the distribution pipe (31), and the two metal pipes (32) are connected to the distribution pipe (31). One end of the water outlet pipe (33) is fixedly connected to the distribution pipe (31), and the two are connected. The water outlet pipe (33) is located between the two metal pipes (32).
5. A forestry tree irrigation device according to claim 4, characterized in that, The rotating irrigation unit (4) includes multiple sliding rods (41), a notched gear (42), and multiple irrigation pipes (43). The bottom ends of the multiple sliding rods (41) are slidably connected to the annular slide (22). The bottom of the notched gear (42) is fixedly set at the top of the multiple sliding rods (41). The notched gear (42) can rotate in the annular slide (22) through the multiple sliding rods (41). A water storage groove is opened at the top of the notched gear (42). The other end of the water outlet pipe (33) corresponds to the water storage groove. The multiple irrigation pipes (43) are fixedly set at the bottom of the notched gear (42), and the multiple irrigation pipes (43) are connected to the water storage groove.
6. A forestry tree irrigation device according to claim 5, characterized in that, The water flow drive unit (5) includes two rotating shafts (51), two water turbine blades (52), and two transmission gears (53). The top ends of the two rotating shafts (51) are connected to the two metal pipes (32) through sealed bearings, and the bottom ends of the two rotating shafts (51) are rotatably connected to the base plate (21). The two water turbine blades (52) are respectively fixedly installed on the top ends of the two rotating shafts (51), and the two transmission gears (53) are respectively fixedly mounted on the two rotating shafts (51).
7. A forestry tree irrigation device according to claim 6, characterized in that, A filter screen (44) is provided on the top of the water storage groove.
8. A forestry tree irrigation device according to claim 7, characterized in that, The gap width at the notch of the annular slide (22) is equal to the gap width at the notch of the notched gear (42).
9. A forestry tree irrigation device according to claim 8, characterized in that, The centers of the two transmission gears (53) are the same on the axis and are located on both sides of the notched gear (42).
