Rapid algae removal equipment applied to urban water body

Abstract

The utility model discloses rapid algae removal equipment applied to an urban water body. The equipment comprises a medicament storage device, a spraying pontoon and a medicament transmission device used for connecting the medicament storage device with the spraying pontoon, wherein the medicament storage device is arranged on the shore beside a target water body; the spraying floating pontoon floats on the water surface of a target water body and is used for spraying an algae removal reagent; the medicine conveying device is used for conveying an algae removal reagent and recycling the spraying pontoon, and comprises a reel device and a hose wound on the reel device; the reel device is arranged on the shore side beside the target water body, the first end of the hose is communicated with the agent storage device, and the second end of the hose is connected with a feeding port of the spraying pontoon. The equipment is simple in structure, does not need to pre-embed a pipeline, can be quickly mounted, can quickly respond to an urban water bloom outbreak event, is simple and convenient to operate when being used for removing algae, can spray an algae removal reagent to a water area only by operating on the shore, and does not need to take a pontoon for manual throwing.

Description

Technical Field

[0001] The utility model relates to the technical field of algae removal, in particular to a rapid algae removal device applied to urban water bodies. Background Art

[0002] Urban lakes are an important part of the urban ecosystem and play an important role in people's entertainment, leisure activities, etc. However, with the rapid development of the economy, a large number of pollutants enter urban rivers and lakes, causing eutrophication problems in urban rivers and lakes generally, and cyanobacteria blooms break out, destroying the stability of the lake ecosystem and causing deterioration of the urban landscape water environment. Cyanobacteria blooms have become the main environmental problems faced by lakes and reservoirs in China.

[0003] In the process of adding algae removal reagents using existing algae removal equipment, the inventors of the present application noticed the following problems: for example, manual addition has low efficiency and cannot be monitored in real time, the structure of the algae removal equipment is complex, buried pipelines are required, and the installation process is too cumbersome to respond to algal blooms in a timely manner; therefore, it is necessary to develop an algae removal device that can quickly respond to algal blooms in urban water bodies. Summary of the Invention

[0004] According to an embodiment of the present utility model, the purpose is to provide a rapid algae removal device and method applied to urban water bodies to solve the problems of the complex structure of existing algae removal equipment, cumbersome installation, and inability to quickly respond to algal bloom events in urban water bodies.

[0005] The above purpose can be achieved by the following implementation modes of technical solutions:

[0006] A rapid algae removal device applied to urban water bodies includes: a reagent storage device, a spraying floating boat, and a drug transmission device for connecting the reagent storage device and the spraying floating boat. The reagent storage device is placed on the shore beside the target water body; the spraying floating boat floats on the water surface of the target water body for spraying algae removal reagents; the drug transmission device is used for transmitting algae removal reagents and recovering the spraying floating boat, and includes: a reel and a hose wound around the reel; wherein, the reel is placed on the shore beside the target water body, the first end of the hose is communicated with the reagent storage device, and the second end is connected to the feed port of the spraying floating boat.

[0007] Optionally, the discharge port of the reagent storage device is communicated with the first end of the hose through an electric diaphragm pump, and a flow meter is also arranged at the outlet of the electric diaphragm pump.

[0008] Optionally, the device further includes: a control cabinet, which is respectively communicatively connected with the electric diaphragm pump and the flow meter, and is used for controlling the opening and closing of the electric diaphragm pump and displaying the flow rate of the pumped algae removal reagent.

[0009] Optionally, the device further includes: a mobile housing, in which all components are placed when not in use, and the drug delivery device and the spraying floating boat are taken out and connected when in use.

[0010] Optionally, the outlet of the electric diaphragm pump is led out of the mobile housing to connect to the first end of the hose in the drug delivery device.

[0011] Optionally, a plurality of nozzles that spray backward are provided at the rear side of the hull of the spraying floating boat, and the outlets of the nozzles are located below the water surface. There is no driving device in the spraying floating boat, and the forward movement power is provided by spraying the algae removal reagent backward through the nozzles.

[0012] Optionally, a stirrer and a liquid level gauge are also inserted in the reagent storage device, a feed valve is provided at the feed port, and a discharge valve is provided at the discharge port; and the stirrer, the liquid level gauge, the feed valve and the discharge valve are respectively in communication connection with the control cabinet.

[0013] Optionally, a rigid pipe is respectively connected to the inlet and outlet of the electric diaphragm pump, and is respectively connected to the reagent storage device and the first end of the hose through the rigid pipe.

[0014] Optionally, the mobile housing is a stainless steel cuboid shell with a door on one side.

[0015] Optionally, the hull of the spraying floating boat is made of plastic, and the nozzles are made of stainless steel.

[0016] Optionally, the drug delivery device further includes: a nylon rope wound around the hose; both ends of the nylon rope are respectively fixed to the reel and the spraying floating boat.

[0017] Optionally, the device further includes: an algae removal reagent preparation device for preparing an algae removal reagent using river bottom mud and chitosan and sending the algae removal reagent to the reagent storage device.

[0018] Beneficial effects: The algae removal device of the present utility model has a simple and compact structure, can be quickly installed, can quickly respond to the water bloom in the urban water body, and the required equipment can be directly set beside the target water body without laying pipelines and spraying devices or manual spraying in the target water area. The algae removal reagent can be quickly distributed in the target water area by operating on the shore, realizing rapid large-scale spraying.

[0019] Compared with the prior art, the present utility model also has the following advantages:

[0020] 1. The rapid algae removal device applied to urban water bodies provided in the embodiment of the present utility model has a compact structure and can be quickly transported to the side of the target water body by a transportation vehicle. After quick installation, it can quickly respond to the outbreak of algal blooms in urban water bodies. This algae removal device does not require pre-buried pipelines and spraying devices. When removing algae, the operation is simple and convenient. Only by operating on the shore can the algae removal reagent be sprayed on a large range of water areas, without the need to take a floating boat for manual spraying.

[0021] 2. In the optional embodiment of the present utility model, the rapid algae removal device adopts a reel and a hose to form a drug transmission device, which can not only realize the transmission of the algae removal reagent but also move and recycle the spraying floating boat by rotating the reel to release or recycle the hose.

[0022] 3. In the optional embodiment of the present utility model, the rapid algae removal device is provided with a plurality of nozzles that spray backward at the rear side of the spraying floating boat. The power for the forward movement of the spraying floating boat is provided by spraying the algae removal reagent backward through the nozzles, so that the spraying floating boat does not need to be provided with other power driving devices. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the rapid algae removal device applied to urban water bodies in an embodiment of the present utility model.

[0024] Figure 2 is a top view of a partial structure of the rapid algae removal device applied to urban water bodies in an embodiment of the present utility model when the door is in the open state.

[0025] Figure 3 is a schematic structural diagram of the spraying floating boat in the rapid algae removal device applied to urban water bodies in an embodiment of the present utility model.

[0026] Reference Signs: 1 housing; 101 reagent storage device; 102 stirrer; 103 liquid level gauge; 104 electric diaphragm pump; 105 electromagnetic flowmeter; 106 control cabinet; 107 storage tank feed port; 108 feed valve; 2 spraying floating boat; 201 hull; 202 spraying floating boat feed port; 203 nozzle; 301 reel; 302 hose. Detailed Embodiments

[0027] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] The rapid algae removal equipment for urban water bodies provided by the utility model includes a chemical storage device, a spraying floating boat, and a drug transmission device for connecting the chemical storage device and the spraying floating boat to transport algae removal reagents and recover the spraying floating boat. The equipment has a simple structure, does not require pre-buried pipelines, and can be quickly installed, and can quickly respond to the outbreak of algal blooms in urban water bodies. When applied to urban water bodies for rapid algae removal, the drug transmission device can be used to connect the chemical storage device and the spraying floating boat first. The chemical storage device is placed on the shore beside the target water body, and the spraying floating boat is placed in the target water body and floats on the water surface. Then, the drug transmission device is controlled from the shore to transport the algae removal reagents in the chemical storage device to the spraying floating boat, and the algae removal reagents are sprayed into the water through the spraying floating boat to make the algae removal reagents evenly distributed on the target water body. After spraying, the spraying floating boat is recovered by controlling the drug transmission device from the shore. The algae removal process is simple and convenient. Only by operating on the shore can the algae removal reagents be sprayed on a large area of water, without the need to take a floating boat for manual spraying.

[0029] Figures 1 to 3 Schematically shows a structural diagram of the rapid algae removal equipment for urban water bodies in an embodiment of the utility model. As Figures 1 to 3 shown, the structure of a rapid algae removal equipment for urban water bodies provided in this embodiment includes: a housing 1, a chemical storage device 101, a spraying floating boat 2, a drug transmission device, and a control cabinet 106. Among them, the drug transmission device includes a diaphragm pump, a reel 301, and a hose 302. In this embodiment, the diaphragm pump is an electric diaphragm pump 104.

[0030] The housing 1 is set to be mobile for convenient transportation to quickly respond to the target water body with cyanobacteria blooms. For example, it can be directly placed on a conveying device for transportation, etc. When not in use, all components are placed in the housing 1. When in use, the reel 301, the spraying floating boat 2, and the hose 302 are taken out and connected, and other components are still placed in the housing 1. In addition, as Figure 2 shown, the housing 1 can also be provided with a door, such as a double door, for staff to use and maintain the equipment.

[0031] The chemical storage device 101 is located on one side inside the housing 1. Its main body is a storage tank. A stirrer 102 and a liquid level gauge 103 are provided on the top of the storage tank. A storage tank feed port 107 and a feed valve 108 are also provided on the top of the storage tank, and a discharge port is provided at the bottom of the storage tank.

[0032] The electric diaphragm pump 104 is arranged on one side of the discharge port of the chemical storage device 101 inside the housing 1. The inlet of the electric diaphragm pump 104 is connected to the discharge port at the bottom of the chemical storage device through a rigid pipeline, such as a rigid PVC pipeline, etc., and the outlet of the electric diaphragm pump 104 is led outside the housing 1 through a pipeline, such as a PVC pipeline. In addition, an electromagnetic flowmeter 105 is also arranged at the outlet of the electric diaphragm pump 104.

[0033] The control cabinet 106 is installed on the inner wall of the upper part of the housing 1 through a support frame, which can improve the use safety. Therefore, the control cabinet is communicatively connected to the agitator 102, the flowmeter 105, the liquid level gauge 103, and the electric diaphragm pump 104. The control cabinet can control the opening and closing of the agitator 102 and the electric diaphragm pump 104, and can display the liquid level height of the algae removal reagent in the storage tank and the pumped flow rate of the algae removal reagent. In addition, the control cabinet is also provided with an alarm, which emits an alarm signal when the liquid level height in the chemical storage device 101 is not within the preset range (that is, when the liquid level of the algae removal reagent is too low or too high). At this time, the control cabinet will accordingly close the feed valve 108 and / or the electric diaphragm pump 104.

[0034] The structure of the spraying floating ship 2 is as Figure 3 shown. A plurality of nozzles 203 that spray backward are arranged at the rear side of the hull 201, and the nozzles 203 are arranged at the lower part of the rear side of the hull 201 so that the outlets of the nozzles 203 are located below the water surface. The nozzles 203 are communicated with the spraying floating ship feed port 202 through a pipeline, and the spraying floating ship feed port 202 is located at the top of the spraying floating ship 2. In addition, in this embodiment, other power driving devices may not be provided in the spraying floating ship 2, and only by spraying the algae removal reagent backward through the nozzles 203 to provide the power for the spraying floating ship 2 to move forward.

[0035] The drug transmission device includes an electric diaphragm pump 104, a reel 301, and a hose 302 in this embodiment. As Figure 1 shown, during application, the electric diaphragm pump 104 is still located inside the housing 1, the reel 301 is placed on the bank beside the target water body, the hose 302 is wound around the reel 301, the first end of the hose 302 is connected to the chemical storage device through the electric diaphragm pump 104, and the second end of the hose 302 is connected to the spraying floating ship feed port 202. In addition, in order to avoid the problem that the hose 302 is separated from the spraying floating ship 2 and cannot be recovered, a nylon rope is also wound outside the hose 302, and both ends of the nylon rope are fixed to the reel 301 and the spraying floating ship 2 respectively.

[0036] Optionally, the device may further include an algicide preparation device for preparing an algicide using river sediment and chitosan and sending the algicide to a medicament storage device. Exemplarily, it includes, for example, a river sediment drying and calcining unit, a crushing and screening unit, a chitosan solution preparation container, and an aqueous and powder mixing and stirring unit, etc.

[0037] The following is a brief description of the usage method of the rapid algal removal device applied to urban water bodies:

[0038] Step 10: Transport the rapid algal removal device to the side of the target water body; when a cyanobacteria bloom occurs in the target water body, open the door on the housing 1, remove the reel 301, the spraying floating boat 2, and the hose 302; place the reel 301 on the shore beside the target water body, connect the first end of the hose 302 coiled on the reel 301 to the outlet pipe of the electric diaphragm pump 104, connect the second end of the hose 302 to the feeding port 202 of the spraying floating boat, fix the end of the nylon rope to the spraying floating boat 2, and place the spraying floating boat 2 on the water surface at a certain distance from the shore.

[0039] Step 20: Feed the pre-prepared / on-site prepared algicide into the medicament storage device 101, turn on the stirrer 102 to keep the algicide in a suspended state, control the flow rate to be stable within a predetermined range through the electric diaphragm pump 104, the algicide in the medicament storage device is transported into the spraying floating boat 2 and sprayed backward through the rear nozzle 203 of the spraying floating boat 2. At the same time, rotate the reel 301 at a uniform speed to release the hose 302, so that the spraying floating boat 2 moves forward at a speed of 0.3 - 0.5 m / s and sprays the algicide. Further, the dosage of the algicide added to each cubic meter of water bloom water body is controlled to be 0.3 - 0.5 kg.

[0040] Step 30: After all the hoses 302 are released, the diaphragm pump can be turned off, and the reel 301 is rotated to tow the hose 302 to recover the spraying floating boat 2 and place it at the next designated position. In addition, cleaning liquid can be pumped in to flush the medicament storage device 101 and pipelines in the device until the spraying floating boat 2 sprays clear liquid. Also, when recovering the spraying floating boat 2 and the reel 301, after all the water in the pipeline is drained, then put them into the housing 1.

[0041] In addition, for the rapid algal removal device applied to urban water bodies in the present utility model, the algicide in the drug storage device can be pre-prepared and then transported to the site, or can be transported to the site in the form of powder and aqueous solution respectively and then configured on-site and stored temporarily, which can reduce the transportation, application, and storage costs of the algicide.

[0042] In addition, for the removal of harmful algal blooms, there are a wide variety of algal removal reagents on the market, but they are generally based on modified clay. On the one hand, a large amount of clay is consumed, chemical flocculants such as PAC (poly aluminum chloride) containing aluminum ions and copper sulfate containing Cu ions are used, and the biological safety is low, which has a certain toxic effect on aquatic animals and plants. In order to further improve the actual safety and reduce the clay consumption, an algal removal reagent prepared by pre-configuring / on-site configuring river sediment and chitosan is adopted. Exemplarily, it is prepared according to the following steps: 1) Take the river sediment, dry it in the sun, calcine it in a muffle furnace, after calcination, cool the temperature of the sediment to room temperature, carry out grinding and pulverization treatment, and sieve to remove large particles to obtain the algal removal reagent powder. Among them, the calcination temperature is 500-720°C, the calcination time is 4-6h, and a 120-200 mesh sieve is used for screening. 2) Add chitosan to a dilute hydrochloric acid solution with a mass concentration of 1-5% to prepare a chitosan solution with a mass concentration of 0.2-1%, that is, the algal removal reagent aqueous solution is obtained. 3) Mix the algal removal reagent aqueous solution and the algal removal reagent powder in a mass ratio of 2-10:1, and stir evenly for 15-30 minutes to prepare the algal removal reagent.

[0043] The following describes the rapid algal removal equipment and its use process in the present utility model in more detail with specific embodiments.

[0044] Embodiment

[0045] This embodiment is carried out in a certain lake in Ma'anshan City. The lake surface has been seriously piled up with cyanobacteria for a long time and is in a state of cyanobacterial bloom. The start time of the experiment is late October, and a rapid algal removal equipment is set up.

[0046] Among them, the housing 1 of the algal removal equipment is a stainless steel rectangular parallelepiped shell with a height of 1.6m, a length of 1.6m, and a width of 1.2m, and a door is opened on the side for operators to use and maintain the equipment.

[0047] The main body of the reagent storage device of this rapid algal removal equipment is a 500L PE material storage tank, which is located inside the housing 1. A stirrer 102 and a liquid level gauge 103 are arranged on the top of the storage tank to prevent the algal removal reagent from settling and stratifying and measure the liquid level height of the algal removal reagent in the storage tank; a storage tank inlet 107 and a valve are arranged on the top of the storage tank, and an outlet is arranged at the bottom, and an outlet valve is also arranged at the outlet. The algal removal reagent can be pumped into the storage tank before the equipment is used.

[0048] The set flow rate of the electric diaphragm pump 104 is 1000L / h, and the head is 40m. The inlet of the electric diaphragm pump 104 is connected to the outlet of the storage tank through a rigid PVC pipeline, and the outlet of the electric diaphragm pump 104 is led out of the housing 1 through a PVC pipeline. A flow meter 105 is also arranged at the outlet of the electric diaphragm pump 104 to measure the flow rate of the algal removal reagent.

[0049] The rapid algae removal equipment is also provided with a control cabinet, and is communicated with the agitator 102, the flow meter 105, the liquid level meter 103 and the diaphragm pump to realize the on and off control of the agitator 102 and the diaphragm pump, and display the liquid level height and the algae removal agent flow rate in the storage tank on the control cabinet display screen. When the liquid level in the storage tank is too low, the diaphragm pump is stopped and a prompt is given that the liquid level is too low.

[0050] The main body of the spraying pontoon 2 is a plastic hull 201 with a length of about 1m. A plurality of rearwardly disposed stainless steel nozzles 203 are arranged at the rear bottom of the hull 201. The outlet aperture of the nozzle 203 is 2mm and is located below the water surface. A spraying pontoon feed port 202 is arranged on the hull 201 and is connected to the nozzle 203.

[0051] The drug delivery device includes a reel 301 and a hose 302 wound on the reel 301, with a length of about 30m, and a nylon rope wound outside the hose 302; the end of the hose 302 is connected to the spray pontoon feed port 202 through a buckle. The spray pontoon 2 and the reel 301 are both placed in the housing 1 and taken out from the housing 1 when in use.

[0052] The operation process of the equipment when in use is as follows: 1) First, connect the spraying pontoon 2 to the outlet of the electric diaphragm pump 104 leading out of the shell 1 through the hose 302, place the spraying pontoon 2 on the water surface at a distance from the shore, and place the reel 301 on the shore. 2) Open the feed valve 108 of the storage tank, pump the algaecide reagent into the storage tank through the storage tank feed port 107, and turn on the agitator 102 through the control cabinet to keep the algaecide reagent suspended. After the storage tank is full, stop pumping the algaecide reagent and close the valve. 3) Open the valve and the electric diaphragm pump 104 at the storage tank outlet in turn through the control cabinet to control the flow rate to be stable within a certain range. At this time, the nozzle 203 at the tail of the spraying pontoon 2 sprays the algaecide reagent to push the pontoon forward. The reel 301 is rotated at a uniform speed to release the hose 302, so that the spraying pontoon 2 moves forward at a speed of about 0.5m / s. In addition, during the spraying of the algaecide reagent, the agent is fully mixed with the lake water, and the blue algae are observed to sink immediately. 4) After the hose 302 is completely released, turn off the diaphragm pump, rotate the reel 301 to recover the spray pontoon 2, and place it at the next designated location. In addition, after the spraying operation is completed, there is no visible algal bloom in the target waters, and the blue algae are effectively controlled. The agent storage device can temporarily store agents, but the algaecide should be sprayed as completely as possible during each spraying operation, and the pipeline should be flushed to avoid blockage. For example, after the spraying operation is completed, pump in clean water to flush the storage tank and pipeline until the liquid sprayed by the spray pontoon 2 becomes clear and then stop flushing, pull the hose 302 to recover the spray pontoon 2, and after draining all the water in the pipeline, put the spray pontoon 2 and the agent storage device 101 back into the housing 1.

[0053] In addition, in this embodiment, the algae removal reagent used is prepared in advance with river sediment and chitosan, and its preparation process is as follows: 1) Spread the sediment flat to dry, calcine the sediment without large stones at 650 °C for 4 h. Coarsely screen the calcined sediment to remove large stones, and then add it to a grinder for grinding. Pass the ground powder through a 200-mesh sieve to obtain the powder for standby. 2) Add half of the tap water to a 25-L white plastic bucket. Weigh 250 g of chitosan, add hot water and stir to avoid chitosan caking, obtaining a dissolved chitosan hot solution. Pour the dissolved chitosan hot solution into the white plastic bucket while stirring, ensuring that there are no undissolved solids in the water. Add 500 ml of concentrated hydrochloric acid, and the solution becomes clear and transparent to obtain the aqueous solution. 3) Add 3 kg of the powder to the aqueous solution, cover the bucket lid and shake well, and then add tap water to fill the bucket.

[0054] The description of the present invention has been given for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, and to enable others of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. A rapid algae removal device applied to urban water bodies, characterized in that, Comprising: An algae removal reagent preparation device, a reagent storage device, a spraying floating ship, and a drug transmission device for connecting the reagent storage device and the spraying floating ship. The algae removal reagent preparation device is used to prepare an algae removal reagent using river sediment and chitosan and send the algae removal reagent into the reagent storage device. The reagent storage device is placed on the shore beside the target water body. The spraying floating ship floats on the water surface of the target water body for spraying the algae removal reagent. The drug transmission device is used to transmit the algae removal reagent and recover the spraying floating ship, including: a reel and a hose coiled around the reel; wherein, the reel is placed on the shore beside the target water body, the first end of the hose is communicated with the reagent storage device, and the second end is connected to the feed port of the spraying floating ship.

2. The rapid algae removal equipment applied to urban water bodies according to claim 1, characterized in that The discharge port of the reagent storage device is communicated with the first end of the hose through an electric diaphragm pump, and a flow meter is further arranged at the outlet of the electric diaphragm pump. The equipment further includes: a control cabinet, which is respectively communicatively connected with the electric diaphragm pump and the flow meter, and is used to control the opening and closing of the electric diaphragm pump and display the flow rate of the pumped algae removal reagent.

3. The rapid algae removal equipment applied to urban water bodies according to claim 2, characterized in that The equipment further includes: a mobile housing, and when not in use, all components are placed in the housing, and when in use, the drug transmission device and the spraying floating ship are taken out and connected. The outlet of the electric diaphragm pump is led out of the mobile housing to connect the first end of the hose in the drug transmission device.

4. The rapid algae removal equipment applied to urban water bodies according to claim 3, characterized in that A plurality of nozzles that spray backward are arranged at the rear side of the hull of the spraying floating ship, and the outlets of the nozzles are located below the water surface. There is no driving device in the spraying floating ship, and the forward movement power is provided by spraying the algae removal reagent backward through the nozzles.

5. The rapid algae removal equipment applied to urban water bodies according to claim 4, characterized in that A stirrer and a liquid level gauge are further inserted in the reagent storage device, a feed valve is arranged at the feed port, and a discharge valve is arranged at the discharge port; and the stirrer, the liquid level gauge, the feed valve and the discharge valve are respectively communicatively connected with the control cabinet.

6. The rapid algae removal device applied to urban water bodies according to claim 5, wherein, The inlet and outlet of the electric diaphragm pump are respectively connected with a rigid pipe, and are respectively connected with the reagent storage device and the first end of the hose through the rigid pipe.

7. The rapid algae removal device applied to urban water bodies according to claim 5, wherein The mobile housing is a stainless steel cuboid shell with a door opened on one side.

8. The rapid algae removal device applied to urban water bodies according to claim 5, characterized in that, The hull of the spraying floating ship is made of plastic, and the nozzles are made of stainless steel.

9. The rapid algae removal device applied to urban water bodies according to claim 8, characterized in that, The drug transmission device further includes: a nylon rope wound around the hose; both ends of the nylon rope are fixed to the reel and the spraying floating ship respectively.

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