Jet device for green belt

Abstract

The utility model discloses a spraying device for a green belt, which comprises a spraying device and a watering cart, and the spraying device comprises a folding bracket, and a water suction pump, a water conveying pipe, a hydraulic proportional dosing pump and a spraying pipeline with a nozzle which are connected in sequence; the folding support comprises a vertical rotating arm, a horizontal rotating arm, a vertical supporting arm and a horizontal supporting arm, the vertical supporting arm and the horizontal supporting arm are fixedly connected, the two ends of the horizontal rotating arm are rotationally connected with the upper end of the vertical rotating arm and the upper end of the vertical supporting arm through spring hinges respectively, and the end, away from the vertical supporting arm, of the horizontal supporting arm is connected with the side wall of the water storage tank. The horizontal rotating arm and the vertical rotating arm are connected with an adjusting mechanism used for driving the horizontal rotating arm and the vertical rotating arm to overturn upwards by 90 degrees. The water suction pump is connected with a water storage tank of the watering cart, the hydraulic proportional dosing pump is connected with a pesticide box through a dosing pipe, and the spraying pipeline is sequentially connected with the vertical supporting arm, the horizontal rotating arm and the vertical rotating arm. The sprayer has two functions of pesticide spraying and water spraying, and is suitable for pesticide spraying of green belts in the center of a road and border trees on the two sides of the road.

Description

Technical Field

[0001] The utility model relates to the technical field of greening spraying devices, in particular to a spraying device for green belts. Background Art

[0002] During the road maintenance process, it is necessary to water and apply pesticides to the central green belt of the road and the roadside trees.

[0003] In the prior art, for example, Chinese utility model patent CN208768798U discloses a vehicle-mounted spraying device for highway green belts, which uses a water tank of a sprinkler truck to mix insecticide for spraying. Since the pesticide is directly mixed in the water tank of the sprinkler truck, the water tank will be contaminated by the pesticide, which is difficult to clean completely, thus affecting the subsequent use for watering.

[0004] In addition, there are some existing technologies such as Chinese utility model patent CN220545719U and Chinese invention patent application CN113317298A, which disclose a method of setting up a special spraying vehicle specifically for spraying operations, using a liquid pump to extract the liquid in the liquid storage tank on the vehicle and spraying it through a foldable bracket. This method has the following defects: (1) Since a special spraying vehicle needs to be added, the maintenance cost of road maintenance units such as municipalities will increase, and the function is relatively simple, only used for spraying operations; (2) In order to achieve multi-angle spraying, a foldable and unfoldable spraying support pipe is set, and the synchronous unfolding mechanism used is relatively complex and not easy to maintain; (3) It is only suitable for spraying shorter central green belts and shorter shrubs on the roadside, but cannot be used for spraying taller roadside trees.

[0005] To this end, a green belt spraying device is proposed which is improved based on the existing sprinkler truck and can take into account the two functions of sprinkling water and spraying pesticides. The spraying angle can be adjusted to adapt to various spraying operation conditions. Utility Model Content

[0006] The purpose of the utility model is to provide a spray device for green belts, which realizes the dual functions of sprinkling water and spraying pesticides. It can not only carry out enveloping spraying and applying pesticides to rows of shorter green plants, but also can spray and apply pesticides to taller roadside trees on the side of the road by changing the angle of the spray pipe when walking on the side of the road, which well solves the problems mentioned in the above background technology.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A spraying device for a green belt, comprising a spraying device and a sprinkler truck with a water storage tank, wherein the spraying device comprises a folding bracket and a water pump, a water pipe, a hydraulic proportional dosing pump and a spray pipe with a plurality of nozzles connected in sequence; the folding bracket comprises a vertical rotating arm, a horizontal rotating arm and a vertical support arm and a horizontal support arm that are fixedly connected, wherein the two ends of the horizontal rotating arm are rotatably connected to the upper end of the vertical rotating arm and the upper end of the vertical support arm respectively through a spring hinge, and the horizontal support arm is rotatably connected to the upper end of the vertical rotating arm and the upper end of the vertical support arm when the horizontal support arm is away from the vertical support arm. One end of the arm is connected to the side wall of the water tank; the horizontal rotating arm and the vertical rotating arm are connected with an adjustment mechanism for driving the upward flip 90 degrees. In the natural state, the vertical support arm, the horizontal rotating arm and the vertical rotating arm form an "n"-shaped spraying area; the water pump is connected to the water tank of the sprinkler truck, and the hydraulic proportional dosing pump is connected to the medicine box through a dosing pipe. The spray pipe is connected to the vertical support arm, the horizontal rotating arm and the vertical rotating arm in sequence at the end with the nozzle.

[0009] Furthermore, a plurality of the spray heads are evenly spaced along the spray pipe in the spraying area, so that uniform spraying is possible.

[0010] Furthermore, the spray pipe is respectively connected to the vertical support arm, the horizontal rotating arm, and the vertical rotating arm by binding straps.

[0011] Furthermore, the spring hinge comprises two hinges rotatably connected by a shaft and a torsion spring sleeved on the shaft. The ends of the torsion spring abut the two hinges, respectively. The spring hinges can open and close at angles ranging from 90° to 180°, allowing for easy adjustment of the folding bracket's position to spray pesticides on central green belts and roadside trees. In their natural state, the two hinges form a 90-degree angle.

[0012] Furthermore, the adjustment mechanism includes a motor, a rope winding wheel, a traction rope, a rope binding ring, several guide rings, a power supply module and a control switch. The rope binding ring is fixed to the lower end of the vertical rotating arm, and the two ends of the vertical support arm, the two ends of the horizontal rotating arm, and the upper end of the vertical rotating arm are respectively provided with a guide ring. One end of the traction rope is connected to the rope binding ring, and the other end of the traction rope passes through each guide ring in turn and is connected to the rope winding wheel. The rope winding wheel is connected to the power output shaft of the motor, and the motor is respectively connected to the power supply module and the control switch. When the traction rope is in a naturally unstressed state, under the action of two spring hinges, the vertical rotating arm flips and is distributed vertically with the horizontal rotating arm, and the horizontal rotating arm flips and is distributed vertically with the vertical support arm, so as to facilitate full-coverage spraying and pesticide application on the central green belt of the road; and when the motor is started, the rope reel is driven by the motor to rotate, thereby pulling the traction rope, and then the vertical rotating arm and the horizontal rotating arm are flipped 90 degrees to a vertical state, so that the roadside trees can be sprayed and pesticides can be applied.

[0013] Furthermore, a first limit plate protruding toward the spraying area is fixedly provided at the upper end of the vertical support arm, and the first limit plate is perpendicular to the vertical support arm; a second limit plate protruding away from the spraying area is fixedly provided at one end of the horizontal rotating arm near the vertical support arm, and the second limit plate is parallel to the horizontal rotating arm; a third limit plate protruding toward the spraying area is fixedly provided at one end of the horizontal rotating arm near the vertical rotating arm, and the third limit plate is perpendicular to the horizontal rotating arm; a fourth limit plate protruding away from the spraying area is fixedly provided at the upper end of the vertical rotating arm, and the fourth limit plate is parallel to the vertical rotating arm. In this way, the folding bracket can be effectively positioned when it is in the state of spraying the central green belt of the road and when it is in the state of spraying the roadside trees.

[0014] Furthermore, the outer wall of the water tank is provided with a clamp for fastening the medicine box.

[0015] Furthermore, a base is fixed to the side wall of the water tank, and the base is provided with a vertically extending shaft. The horizontal support arm is provided with an assembly block at one end away from the vertical support arm, and the assembly block has an axial hole that is rotatably connected to the shaft. An angle-maintaining mechanism is provided between the base and the assembly block. In this way, the folding bracket can be flipped outward for use, or flipped inward for storage.

[0016] Furthermore, the angle maintaining mechanism includes a first positioning hole, a second positioning hole, a third positioning hole and a locking pin distributed in parallel; the first positioning hole and the second positioning hole are arranged through the base in a vertical direction, the plane formed by the first positioning hole and the shaft is parallel to the surface of the water tank, and the plane formed by the second positioning hole and the shaft is perpendicular to the surface of the water tank; the third positioning hole is arranged through the assembly block in a vertical direction, and the distance from the first positioning hole to the shaft and the distance from the second positioning hole to the shaft are both equal to the distance from the third positioning hole to the shaft; the locking pin is plugged and connected between the third positioning hole and the first positioning hole or between the third positioning hole and the second positioning hole.

[0017] Furthermore, a bearing is provided between the outer surface of the shaft and the inner surface of the shaft hole, and a threaded hole is provided at the top of the shaft, into which a limit screw is installed. This allows the entire sprinkler device to be removed from the sprinkler truck; the bearing also facilitates smoother rotation and opening or storage of the folding bracket.

[0018] Compared with the prior art, the present invention provides a spraying device for green belts, which has the following beneficial effects:

[0019] The utility model can carry out a covering spraying and applying pesticides to rows of shorter green plants by changing the shape of the folding bracket, and can also carry out a spraying and applying pesticides to taller roadside trees by changing the angle of the spray pipe when walking on one side of the road. This device has multiple uses, taking into account the two functions of sprinkling water and spraying pesticides, and is suitable for spraying pesticides on the central green belt of the road and the roadside trees on both sides of the road.

[0020] The medicine box capacity of traditional spraying devices is small (no more than 1 ton), and can only spray about 10 kilometers. The utility model is wall-mounted and uses water from a sprinkler truck (up to 10 tons) to dilute the high-concentration medicine mother liquor, which can achieve centralized spraying on high-speed sections and improve spraying efficiency. At the same time, the medicine liquid is sucked by a hydraulic proportional dosing pump, and the spraying concentration can be freely adjusted, effectively reducing the waste of medicines, reducing the pollution of medicines to the air, and without polluting the water in the sprinkler truck compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1This is a schematic diagram of the three-dimensional structure of the utility model when it is deployed and used;

[0023] Figure 2 This is a schematic diagram of the utility model spraying the central green belt;

[0024] Figure 3 This is a schematic diagram of the assembly of the folding bracket;

[0025] Figure 4 It is a structural diagram of a spring hinge;

[0026] Figure 5 This is a schematic diagram of the rotation installation of the folding bracket;

[0027] Figure 6 This is a schematic diagram of the utility model in spraying roadside trees;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the utility model when it is flipped and stored.

[0029] Figure 10: Sprinkler; 11: Water tank; 12: Hoop; 13: Base; 131: Shaft; 1311: Threaded hole; 132: First positioning hole; 133: Second positioning hole; 14: Lock pin; 15: Bearing; 16: Limit screw; 20: Sprinkler; 2: Folding bracket; 21: Vertical rotating arm; 211: Fourth limiting plate; 22: Horizontal rotating arm; 221: Second limiting plate; 222: Third limiting plate; 23: Vertical support arm; 231: First limiting plate; 24: Horizontal support Support arm; 241, assembly block; 2411, shaft hole; 2412, third positioning hole; 25, spring hinge; 251, hinge; 252, rotating shaft; 253, torsion spring; 3, water pump; 4, water pipe; 5, hydraulic proportional dosing pump; 6, spray pipe; 61, nozzle; 62, binding belt; 7, dosing pipe; 8, medicine box; 9, adjustment mechanism; 91, motor; 92, rope pulley; 93, traction rope; 94, rope ring; 95, guide ring; 96, power supply module; 97, control switch; 30, spray area. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions of the present invention through detailed embodiments and in conjunction with the accompanying drawings. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0031] Please refer to Figures 1 to 7, this embodiment provides a spray device for green belts, including a spray device 20 and a sprinkler truck 10 with a water tank 11, the spray device 20 includes a folding bracket 2 and a water pump 3, a water pipe 4, a hydraulic proportional dosing pump 5 and a spray pipe 6 with a plurality of nozzles 61 connected in sequence; the folding bracket 2 includes a vertical rotating arm 21, a horizontal rotating arm 22 and a fixedly connected vertical support arm 23 and a horizontal support arm 24, the two ends of the horizontal rotating arm 22 are rotatably connected to the upper end of the vertical rotating arm 21 and the upper end of the vertical support arm 23 by a spring hinge 25, and the horizontal support arm 24 is connected to the side wall of the water tank 11 at one end away from the vertical support arm 23; the horizontal rotating arm 22 and the vertical rotating arm 21 are connected It is connected to an adjustment mechanism 9 for driving an upward flip of 90 degrees. In a natural state, the vertical support arm 23, the horizontal rotating arm 22 and the vertical rotating arm 21 form an "n"-shaped spraying area 30, which can correspond to the green plants on the central green belt of the spray road, and can ensure that the plants are sprayed with medicine in all directions; the water pump 3 is connected to the water tank 11 of the sprinkler truck 10, and the hydraulic proportional dosing pump 5 is connected to the medicine box 8 through the dosing pipe 7. The spray pipe 6 is connected to the vertical support arm 23, the horizontal rotating arm 22, and the vertical rotating arm 21 in sequence at one end with a nozzle 61, so that the pumped water will automatically absorb the medicine according to the adjusted proportion after passing through the hydraulic proportional dosing pump. After the medicine is mixed into the water, it flows out from the hydraulic proportional dosing pump to realize spraying and applying medicine.

[0032] On the one hand, by changing the shape of the folding bracket, it can be used to spray and apply pesticides to rows of shorter green plants. Alternatively, by changing the angle of the spray pipe while driving along the road, it can spray and apply pesticides to taller roadside trees. This multi-purpose device combines both watering and spraying functions, making it suitable for spraying pesticides in central green belts and on both sides of the road. On the other hand, through wall-mounted installation, water from a sprinkler truck (up to 10 tons) is used to dilute the high-concentration pesticide stock solution, enabling centralized spraying on highways and improving spraying efficiency. Furthermore, the hydraulic proportional dosing pump draws the pesticide solution, allowing for flexible adjustment of the spray concentration, effectively reducing pesticide waste, air pollution, and water pollution within the sprinkler truck compartment.

[0033] In some specific embodiments, reference Figure 2 and Figure 6 , several of the nozzles 61 are evenly spaced along the spray pipe 6 in the spray area 30, so that uniform spraying can be achieved.

[0034] In some specific embodiments, reference Figure 1 、 Figure 2 and Figure 6The spray pipe 6 is respectively connected to the vertical support arm 23, the horizontal rotation arm 22, and the vertical rotation arm 21 by a strap 62.

[0035] In some specific embodiments, reference Figures 1 to 6 The adjustment mechanism 9 includes a motor 91, a rope reel 92, a traction rope 93, a rope tying ring 94, several guide rings 95, a power supply module 96, and a control switch 97. The rope tying ring 94 is fixed to the lower end of the vertical rotating arm 21. The guide ring 95 is respectively provided at both ends of the vertical support arm 23, the two ends of the horizontal rotating arm 22, and the upper end of the vertical rotating arm 21. One end of the traction rope 93 is connected to the rope tying ring 94, and the other end of the traction rope 93 passes through each guide ring 95 in sequence and is connected to the rope reel 92. The rope reel 92 is connected to the power output shaft of the motor 91. The motor 91 is respectively connected to the power supply module 96 and the control switch 97. The control switch includes a switch that bends the spray pipe and a switch that straightens the spray pipe. When the traction rope is in a naturally stress-free state, under the action of two spring hinges, the vertical rotating arm flips and is distributed vertically with the horizontal rotating arm, and the horizontal rotating arm flips and is distributed vertically with the vertical support arm, so as to facilitate full-coverage spraying and pesticide application on shorter green plants; and when the motor is started, the rope reel is driven by the motor to rotate, thereby pulling the traction rope, and then the vertical rotating arm and the horizontal rotating arm are flipped 90 degrees to a vertical state, so that higher roadside trees can be sprayed and pesticides can be applied.

[0036] In some specific embodiments, reference Figure 3 and Figure 4 The spring hinge 25 comprises two hinges 251 rotatably connected by a rotating shaft 252, and a torsion spring 253 sleeved on the rotating shaft 252. The ends of the torsion spring 253 abut the two hinges 251, respectively. The spring hinge 25 can open and close at an angle of 90° to 180°, making it easy to adjust the state of the folding bracket to change the angle of the spray pipe and spray pesticides on the central green belt of the road and roadside trees. In its natural state, the two hinges are arranged at a 90-degree angle. When the motor is started to wind the traction rope, the torsion spring on the spring hinge is stressed, causing the spring hinge to open 180 degrees. This allows the spray pipe with the nozzle to open into a straight line, allowing it to spray tall trees or large shrubs. When spraying is completed, the motor is adjusted to loosen the traction rope, and the spring hinge automatically returns to a 90-degree angle after the torsion spring releases the force.

[0037] Due to the potential safety hazards in highway construction, in some specific implementation methods, Figure 1The control switch can be set in the cab of the sprinkler truck. In this way, the shape of the folding bracket can be adjusted by operation in the cab (or remote control), thereby changing the angle of spraying and applying pesticides, realizing non-stop continuous spraying, and reducing the impact of spraying construction on traffic.

[0038] In some specific embodiments, reference Figures 1 to 3 and Figure 6 The upper end of the vertical support arm 23 is fixed with a first limiting plate 231 protruding toward the spray area, and the first limiting plate 231 is perpendicular to the vertical support arm 23. The horizontal rotating arm 22 is fixed with a second limiting plate 221 protruding away from the spray area at one end near the vertical support arm 23, and the second limiting plate 221 is parallel to the horizontal rotating arm 22. The horizontal rotating arm 22 is fixed with a third limiting plate 222 protruding toward the spray area at one end near the vertical rotating arm 21, and the third limiting plate 222 is perpendicular to the horizontal rotating arm 22. The upper end of the vertical rotating arm 21 is fixed with a fourth limiting plate 211 protruding away from the spray area, and the fourth limiting plate 211 is parallel to the vertical rotating arm 21. In this way, the folding bracket can be effectively positioned in both the bent and extended states.

[0039] In some specific embodiments, reference Figure 1 The outer wall of the water tank 11 is provided with a clamp 12 for fastening the medicine box 8.

[0040] In some specific embodiments, reference Figures 1 to 7 The side wall of the water storage tank 11 is fixed with a base 13, and the base 13 is provided with a vertically distributed shaft 131. The horizontal support arm 24 is provided with an assembly block 241 at one end away from the vertical support arm 23. The assembly block 241 is provided with an axis hole 2411 that is rotatably connected to the shaft 131. An angle maintaining mechanism is provided between the base 13 and the assembly block 241. Figure 1 As shown, when spraying is required, the folding bracket can be turned outward 90 degrees for use, or, as shown in FIG. Figure 7 As shown, when not spraying, the foldable bracket is turned inward and stored to fit the water tank.

[0041] More specifically, refer to Figure 1 、 Figure 5 and Figure 7, the angle maintaining mechanism includes a first positioning hole 132, a second positioning hole 133, a third positioning hole 2412 and a locking pin 14 distributed in parallel; the first positioning hole 132 and the second positioning hole 133 are arranged through the base 13 in a vertical direction, the plane formed by the first positioning hole 132 and the shaft 131 is parallel to the side surface of the water tank 11, and the plane formed by the second positioning hole 133 and the shaft 131 is perpendicular to the side surface of the water tank 11; the third positioning hole 2412 is arranged through the assembly block 241 in a vertical direction, and the distance from the first positioning hole 132 to the shaft 131 and the distance from the second positioning hole 133 to the shaft 131 are both equal to the distance from the third positioning hole 2412 to the shaft 131; the locking pin 14 is plugged and connected between the third positioning hole 2412 and the first positioning hole 132 or between the third positioning hole 2412 and the second positioning hole 133.

[0042] In some specific embodiments, a bearing 15 is provided between the outer surface of the shaft 131 and the inner surface of the shaft hole 2411. A threaded hole 1311 is provided at the top of the shaft 131, and a limit screw 16 is installed in the threaded hole 1311. This allows the entire sprinkler system to be removed from the sprinkler truck. Furthermore, the bearing also facilitates smoother rotation and opening or folding of the folding bracket.

[0043] The above embodiments are merely illustrative of the concepts and technical solutions of this utility model and are not intended to limit this utility model. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the spirit and technical concepts disclosed in this utility model shall be covered by the claims of this utility model.

[0044] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A spraying device for a green belt, comprising a spraying device and a sprinkler truck with a water storage tank, characterized in that: The spray device includes a folding bracket and a water pump, a water pipe, a hydraulic proportional dosing pump and a spray pipe with several nozzles connected in sequence; the folding bracket includes a vertical rotating arm, a horizontal rotating arm and a fixedly connected vertical support arm and a horizontal support arm, the two ends of the horizontal rotating arm are rotatably connected to the upper end of the vertical rotating arm and the upper end of the vertical support arm by spring hinges respectively, and the horizontal support arm is connected to the side wall of the water tank at the end away from the vertical support arm; the horizontal rotating arm and the vertical rotating arm are connected with an adjustment mechanism for driving an upward flip of 90 degrees. In a natural state, the vertical support arm, the horizontal rotating arm and the vertical rotating arm form an "n"-shaped spraying area; the water pump is connected to the water tank of the sprinkler truck, the hydraulic proportional dosing pump is connected to the medicine box through a dosing pipe, and the spray pipe is connected to the vertical support arm, the horizontal rotating arm and the vertical rotating arm in sequence at the end with the nozzle.

2. The green belt spraying device according to claim 1, characterized in that: A plurality of the spray heads are arranged at equal intervals along the spray pipe in the spray area.

3. The green belt spraying device according to claim 1, characterized in that: The spray pipe is respectively connected to the vertical support arm, the horizontal rotation arm and the vertical rotation arm by binding straps.

4. The green belt spraying device according to claim 1, characterized in that: The spring hinge comprises two hinges rotatably connected by a rotating shaft and a torsion spring sleeved on the rotating shaft. The two ends of the torsion spring respectively abut against the two hinges. The opening and closing angle range of the spring hinge is 90° to 180°.

5. The green belt spraying device according to claim 4, characterized in that: The adjusting mechanism includes a motor, a rope winding wheel, a traction rope, a rope binding ring, several guide rings, a power supply module and a control switch. The rope binding ring is fixed to the lower end of the vertical rotating arm, and the two ends of the vertical support arm, the two ends of the horizontal rotating arm, and the upper end of the vertical rotating arm are respectively provided with a guide ring. One end of the traction rope is connected to the rope binding ring, and the other end of the traction rope passes through each guide ring in turn and is connected to the rope winding wheel. The rope winding wheel is connected to the power output shaft of the motor, and the motor is respectively connected to the power supply module and the control switch.

6. The green belt spraying device according to claim 5, characterized in that: The upper end of the vertical support arm is fixed with a first limit plate protruding toward the spray area, and the first limit plate is perpendicular to the vertical support arm; the horizontal rotating arm is fixed with a second limit plate protruding away from the spray area at one end close to the vertical support arm, and the second limit plate is parallel to the horizontal rotating arm; the horizontal rotating arm is fixed with a third limit plate protruding toward the spray area at one end close to the vertical rotating arm, and the third limit plate is perpendicular to the horizontal rotating arm; the upper end of the vertical rotating arm is fixed with a fourth limit plate protruding away from the spray area, and the fourth limit plate is parallel to the vertical rotating arm.

7. The green belt spraying device according to claim 1, characterized in that: The outer wall of the water storage tank is provided with a clamp for fastening the medicine box.

8. The green belt spraying device according to any one of claims 1 to 7, characterized in that: A base is fixedly provided on the side wall of the water tank, and the base is provided with a vertically distributed shaft rod. The horizontal support arm is provided with an assembly block at one end away from the vertical support arm, and the assembly block is provided with an axial hole rotatably connected to the shaft rod. An angle maintaining mechanism is provided between the base and the assembly block.

9. The green belt spraying device according to claim 8, characterized in that: The angle maintaining mechanism includes a first positioning hole, a second positioning hole, a third positioning hole and a locking pin distributed in parallel; the first positioning hole and the second positioning hole are arranged through the base in a vertical direction, the plane formed by the first positioning hole and the shaft is parallel to the surface of the water tank, and the plane formed by the second positioning hole and the shaft is perpendicular to the surface of the water tank; the third positioning hole is arranged through the assembly block in a vertical direction, and the distance from the first positioning hole to the shaft and the distance from the second positioning hole to the shaft are both equal to the distance from the third positioning hole to the shaft; the locking pin is plugged and connected between the third positioning hole and the first positioning hole or between the third positioning hole and the second positioning hole.

10. The green belt spraying device according to claim 8, characterized in that: A bearing is provided between the outer surface of the shaft and the inner surface of the shaft hole. A threaded hole is provided on the top of the shaft, and a limiting screw is installed in the threaded hole.

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