A ship exterior painting system

Abstract

The utility model provides a kind of ship outer surface spraying system, including feed unit, control unit, sensor unit, spray gun and several connecting pipelines, the feed unit is connected with spray gun by several connecting pipelines, the sensor unit, control unit are all set on several connecting pipelines, and for monitoring and control to spraying process and cleaning process;Wherein, the feed unit can supply the coating for spraying ship outer surface to spray gun, or supply the cleaning solvent for cleaning connecting pipeline and spray gun to spray gun.The utility model in ship outer surface needs to be sprayed in turn primer intermediate paint, topcoat and antifouling paint, when each spraying completes one kind of coating, it is cleaned to connecting pipeline and spray gun, avoid the residual coating in connecting pipeline and spray gun to appear the problem of blockage, also ensure the purity of each layer coating to guarantee spraying effect and quality.

Description

Technical Field

[0001] This utility model relates to the field of ship exterior coating technology, and in particular to a ship exterior coating system. Background Technology

[0002] Both shipbuilding and ship repair operations involve a process of painting the ship's exterior to form a paint film that serves to prevent corrosion, prevent dirt, enhance aesthetics, and provide identification.

[0003] Currently, the main painting method used in domestic shipyards is manual spraying: aerial work platforms transport workers to the work area, where they use hand-held spray guns to perform the painting work. This manual spraying method has problems such as low efficiency, high risk of working at height, and uneven paint film thickness. In particular, manual spraying involves spraying each work area one by one, forming patches of painted surfaces, resulting in more joints between the painted surfaces and reducing the uniformity of the painted surface.

[0004] To address the aforementioned problems with manual spraying, some shipyards in China have adopted automated spraying methods. However, to ensure good corrosion resistance, ships need to be coated with primer, intermediate coat, topcoat, and antifouling paint in sequence. Changing between different coatings requires cleaning the spray guns and pipelines; otherwise, the spray guns will become clogged, severely affecting paint quality and work efficiency. Existing automated spraying methods involve cumbersome cleaning processes with poor cleaning results, easily leading to spray gun clogging. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a ship exterior spraying system to solve the problems of low efficiency of manual spraying, high risk of high-altitude operation, and poor cleaning effect when changing paint in automatic spraying, which easily leads to spray gun clogging.

[0006] To achieve the above objectives, this utility model provides a ship exterior painting system, including a material supply unit, a control unit, a sensor unit, a spray gun, and several connecting pipes. The material supply unit is connected to the spray gun through several connecting pipes. The sensor unit and the control unit are both installed on the several connecting pipes and are used to monitor and control the painting and cleaning processes. The material supply unit can supply paint for painting the ship exterior to the spray gun, or supply cleaning solvent for cleaning the connecting pipes and the spray gun.

[0007] Preferably, the feeding unit includes a drive source, several spray pumps and a material tank. The suction pipe of the spray pump is placed in the material tank, the discharge pipe of the spray pump is connected to the connecting pipeline, and the drive source is connected to the spray pump to drive the spray pump to pump the paint or cleaning solvent in the suction pipe to the discharge pipe.

[0008] Preferably, the driving source is an air source, which is equipped with a main exhaust valve and a pressure gauge. The main exhaust valve is connected to the spray pump through a gas pipeline, and the pressure of the spray pump discharge pipe is adjusted by controlling the opening of the main exhaust valve. The pressure gauge is used to monitor the pressure of the gas discharged from the main exhaust valve.

[0009] Preferably, the plurality of spraying pumps include a standby pump, a primer pump, a topcoat pump, and an antifouling pump. The primer pump is used to pump the primer intermediate coat, which is directly applied to the exterior of the vessel. The topcoat pump is used to pump the topcoat, which is applied over the dried primer intermediate coat. The antifouling pump is used to pump the antifouling paint, which is applied over the dried topcoat. The standby pump is used for temporary backup. There are a plurality of spray guns, and a distribution block is also provided on the connecting pipeline. The distribution block is used to distribute cleaning solvent or different types of coatings into the plurality of spray guns.

[0010] Preferably, a branch exhaust valve is also provided on the gas pipeline between the main exhaust valve and the spray pump. The branch exhaust valve is used to control the opening and closing state of the gas pipeline connected to the spray pump.

[0011] Preferably, the feeding unit further includes a heater for regulating the temperature of the coating.

[0012] Preferably, the control unit includes a relay box, a pneumatic switching valve, a pressure regulating valve, and a spray gun switching valve. The relay box is used to control the working state of the pneumatic switching valve, the pressure regulating valve, and the spray gun switching valve. The pneumatic switching valve is used to control the opening and closing of the connecting pipeline at the discharge end of the feeding unit. The pressure regulating valve is used to regulate the pressure of the paint being delivered to the spray gun. The spray gun switching valve is used to control the opening and closing of the spray gun. In the spraying state, the paint can pass through the pneumatic switching valve, the pressure regulating valve, and the spray gun switching valve in sequence and be sprayed out from the spray gun.

[0013] Preferably, the pressure regulating valve is equipped with an electro-proportional valve, which is connected to a relay box and is used to control the pressure of the coating or cleaning solvent passing through the pressure regulating valve.

[0014] Preferably, a filter is provided between the pneumatic switching valve and the pressure regulating valve, the filter being used to filter impurities in the coating or cleaning solvent.

[0015] Preferably, the sensor unit includes a feeding pressure sensor and a spraying pressure sensor. The feeding pressure sensor is located at the discharge end of the feeding unit and is used to monitor the pressure at the discharge end of the feeding unit. The spraying pressure sensor is located at the inlet end of the spray gun and is used to monitor the pressure at the inlet end of the spray gun.

[0016] As described above, the ship exterior coating system of this utility model has the following beneficial effects:

[0017] 1. The ship exterior spraying system of this utility model adopts an automated system to spray the ship exterior, which solves the problems of low efficiency and high risk caused by high-altitude spraying in the prior art.

[0018] 2. The ship exterior spraying system involved in this utility model is equipped with a control unit and a sensor unit. The control unit and sensor unit are used to monitor and control the spraying process in real time to ensure the spraying effect and quality.

[0019] 3. The ship exterior spraying system involved in this utility model requires the ship exterior to be sprayed with primer, intermediate paint, topcoat and antifouling paint in sequence. After each coating is sprayed, the connecting pipes and spray guns are cleaned to avoid the problem of residual coating in the connecting pipes and spray guns causing blockage, and to ensure the purity of each coating layer and avoid different coating layers from affecting the spraying effect and quality. Attached Figure Description

[0020] Figure 1 This is a flowchart of a ship exterior coating system.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Material feeding unit; 101. Standby pump; 102. Primer pump; 103. Topcoat pump; 104. Anti-fouling paint pump; 2. Branch exhaust valve; 3. Gas pipeline; 4. Pressure gauge; 5. Connecting pipeline; 6. Material feeding pressure sensor; 7. Pneumatic switch valve; 8. Distribution block; 9. Filter; 10. Pressure regulating valve; 11. Spraying pressure sensor; 12. Spray gun switch valve; 13. Electro-proportional valve; 14. Spray gun; 15. Relay box; 16. PLC client; 17. Heater. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0024] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0025] like Figure 1 As shown, this utility model provides a ship exterior spraying system, including a material supply unit 1, a control unit, a sensor unit, a spray gun 14, and several connecting pipes 5. The material supply unit 1 is connected to the spray gun 14 through several connecting pipes 5. The sensor unit and the control unit are both installed on the several connecting pipes 5 and are used to monitor and control the spraying process and the cleaning process. The material supply unit 1 can supply the spray gun 14 with paint for spraying the ship exterior, or supply the spray gun 14 with cleaning solvent for cleaning the connecting pipes 5 and the spray gun 14.

[0026] Preferred, such as Figure 1 As shown, the feeding unit 1 includes a drive source, several spray pumps, and a material tank. The suction pipe of the spray pump is placed in the material tank, and the discharge pipe of the spray pump is connected to the connecting pipe 5. The drive source is connected to the spray pump and is used to drive the spray pump to pump the paint or cleaning solvent in the suction pipe to the discharge pipe. The drive source is an air source, which is equipped with a main exhaust valve and a pressure gauge 4. The main exhaust valve is connected to the spray pump through the gas pipe 3, and the pressure of the spray pump's discharge pipe is adjusted by controlling the opening of the main exhaust valve. The pressure gauge 4 is used to monitor the pressure of the gas discharged from the main exhaust valve. The drive source can also be electric or other types of drive.

[0027] Preferred, such as Figure 1As shown, there are four spraying pumps: a standby pump 101, a primer pump 102, a topcoat pump 103, and an antifouling paint pump 104. Primer pump 102 pumps the primer intermediate coat, which is applied directly to the ship's exterior. Topcoat pump 103 pumps the topcoat, which is applied over the dried primer intermediate coat. Antifouling paint pump 104 pumps the antifouling paint, which is applied over the dried topcoat. Standby pump 101 is used as a temporary backup in case one or more of the primer pump 102, topcoat pump 103, or antifouling paint pump 104 fails. The spraying pumps are driven by an air source and primarily utilize the Bernoulli principle to draw and pump the paint from the tank. Several spray guns 14 are used, and a distribution block 8 is installed on the connecting pipe 5 to distribute cleaning solvents or different types of paint into the spray guns 14.

[0028] Preferred, such as Figure 1 As shown, branch exhaust valves 2 are also installed on the gas pipeline 3 between the main exhaust valve and the four spray pumps. The branch exhaust valves 2 are used to control the opening and closing status of the gas pipeline 3 on the spray pumps. There are four branch exhaust valves 2, each corresponding to one of the four spray pumps.

[0029] Preferred, such as Figure 1 As shown, the feeding unit 1 also includes heaters 17, which are used to regulate the temperature of the coating. In this embodiment, there are four heaters 17, which are arranged one-to-one on the discharge pipe of the spray pump. The coating enters the connecting pipe 5 after being heated by the heaters 17 from the material tank, and the coating is kept within a certain temperature range (e.g., around 30°C) to ensure good fluidity. The rated voltage of the heater 17 is 220V and the rated power is 4kW.

[0030] Preferred, such as Figure 1 As shown, the control unit includes a relay box 15, a pneumatic switch valve 7, a pressure regulating valve 10, and a spray gun switch valve 12. The relay box 15 is used to control the working state of the pneumatic switch valve 7, the pressure regulating valve 10, and the spray gun switch valve 12. The pneumatic switch valve 7 is used to control the opening and closing of the connecting pipe 5 at the discharge end of the feeding unit 1. The pressure regulating valve 10 is used to regulate the pressure of the paint being delivered to the spray gun 14. The spray gun switch valve 12 is used to control the opening and closing of the spray gun 14. In the spraying state, the paint can pass through the pneumatic switch valve 7, the pressure regulating valve 10, and the spray gun switch valve 12 in sequence, and be sprayed out from the spray gun 14.

[0031] In this embodiment, the control unit also includes a PLC client 16, which sends control commands to the relay box 15. After receiving and processing the control commands, the relay box 15 transmits the signals to the pneumatic switch valve 7, the pressure regulating valve 10, and the spray gun switch valve 12 to execute the corresponding commands.

[0032] Preferred, such as Figure 1 As shown, an electro-proportional valve 13 is installed on the pressure regulating valve 10. The electro-proportional valve 13 is communicatively connected to the relay box 15 and is used to control the pressure of the paint or cleaning solvent passing through the pressure regulating valve 10. In this embodiment, the amount of compressed air in the electro-proportional valve 13 is adjusted by changing the current value in the electro-proportional valve 13, thereby adjusting the opening of the pressure regulating valve 10 by changing the compressed air, and thus changing the pressure of the paint or cleaning solvent passing through the pressure regulating valve 10. The adjustment value of the spraying pressure is evaluated based on the test results, and different current values ​​can be set for different types of paint.

[0033] Preferred, such as Figure 1 As shown, a filter 9 is also provided between the pneumatic switching valve 7 and the pressure regulating valve 10. The filter 9 is used to filter impurities in the paint or cleaning solvent.

[0034] Preferred, such as Figure 1 As shown, the sensor unit includes a feeding pressure sensor 6 and a spraying pressure sensor 11. The feeding pressure sensor 6 is located at the discharge end of the feeding unit 1 and is used to monitor the pressure at the discharge end of the feeding unit 1. The spraying pressure sensor 11 is located at the feed end of the spray gun 14 and is used to monitor the pressure at the feed end of the spray gun 14.

[0035] In this embodiment, there are three feed pressure sensors 6 and three pneumatic switching valves 7. The three feed pressure sensors 6 correspond one-to-one with the primer pump 102, the topcoat pump 103 and the anti-fouling paint pump 104, respectively. The three pneumatic switching valves 7 are respectively located on the downstream side of the three feed pressure sensors 6.

[0036] There is one distribution block 8, and two filters 9, two pressure regulating valves 10, two electro-proportional valves 13, two spray pressure sensors 11, two spray gun switch valves 12, and two spray guns 14. The distribution block 8 is located downstream of the pneumatic switch valve 7, the two filters 9 are located downstream of the distribution block 8, the two pressure regulating valves 10 are located downstream of the filters 9, the spray pressure sensor 11 is located downstream of the pressure regulating valve 10, and the spray gun switch valve 12 and spray gun 14 are located downstream of the spray pressure sensor 11. The pneumatic switch valve 7 is a 2-position 5-way valve, and the spray gun switch valve 12 is a 2-position 3-way valve.

[0037] The spray pump pumps the paint from the hopper into the spray gun 14. The paint first passes through the feed pressure sensor 6, which detects the paint pressure at this point. Then, it is evenly distributed into two streams by the distribution block 8. After being filtered by the filter 9, the distributed paint flows through the pressure regulating valve 10, the spray pressure sensor 11, and the spray gun switch valve 12 before entering the spray gun 14. The spray pressure sensor 11 monitors the paint pressure at this point (i.e., the spraying pressure of the spray gun 14) and feeds the information back to the relay box 15. The relay box 15 changes the output pressure of the pressure regulating valve 10 by altering the current in the electro-proportional valve 13 installed on the pressure regulating valve 10, thereby changing the spraying pressure of the spray gun 14.

[0038] To achieve the above or other objectives, this utility model also discloses a method for spraying paint on the exterior of a ship, employing the aforementioned ship exterior spraying system. The material supply unit 1 includes a drive source, which is an air source. The ship exterior spraying method is as follows:

[0039] S1: Check if the pressure of the air source meets the standard; first, open the main exhaust valve of the air source, and by adjusting the opening of the main exhaust valve and observing the pressure gauge 4, determine whether the pressure of the compressed air in the air source can reach the working set value (the working set value is 4~6 bar, 0.4~0.6 MPa); after the determination is completed, close the main exhaust valve of the air source.

[0040] S2: Pre-cleaning connecting pipe 5 and spray gun 14;

[0041] S2.1: Prepare the cleaning solvent and connect a spray pump (taking primer pump 102 as an example) to the tank containing the cleaning solvent.

[0042] S2.2: Rotate the nozzle of the spray gun 14 to the cleaning state or pull out the nozzle, and set an appropriate current value to the electro-proportional valve 13 through the relay box 15 so that the cleaning solvent flowing through the pressure regulating valve 10 has an appropriate pressure.

[0043] S2.3: Open the pneumatic switch valve 7 corresponding to the primer pump 102 and the two spray gun switch valves 12;

[0044] S2.4: Open the main exhaust valve of the air source and adjust its opening to maintain the compressed air pressure at 2-3 bar. Simultaneously, open the branch exhaust valve 2 of the gas line 3 on the primer pump 102. Compressed air enters the primer pump 102, and the cleaning solvent is extracted using Bernoulli's fluid dynamics principle. The cleaning solvent flows sequentially through the feed pressure sensor 6, pneumatic switch valve 7, distribution block 8, filter 9, pressure regulating valve 10, spraying pressure sensor 11, and spray gun switch valve 12 before being sprayed out from the spray gun 14. The cleaning time lasts 1-3 minutes until cleaning is complete. The specific cleaning time can be adjusted according to actual production conditions.

[0045] S3: Setting and verifying parameters before spraying;

[0046] S3.1: After cleaning the connecting pipe 5 and spray gun 14 in step S2, close the exhaust valve 2 of the corresponding branch of the primer pump 102. Place the suction pipe of the primer pump 102 into the mixed primer tank, and open the exhaust valve 2 of the corresponding branch of the primer pump 102 again. The primer is pumped from the tank to the spray gun 14.

[0047] S3.2: Observe the state of the primer sprayed from the spray gun 14. When the sprayed primer reaches the state required for the primer to be sprayed, close the spray gun 14 through the spray gun switch valve 12 and rotate the nozzle of the spray gun 14 to the spraying state.

[0048] S3.3: Adjust the opening of the main exhaust valve of the air source to bring the pressure of the compressed air in the air source to the working set value (4~6 bar, 0.4~0.6 MPa), detect the parameters fed back by the material supply pressure sensor 6 and the spraying pressure sensor 11, and determine whether the material supply pressure and spraying pressure parameters meet the set parameter range. If they do not meet the set range, control the opening of the main exhaust valve of the air source to adjust the material supply pressure, and control the current value in the electric proportional valve 13 to adjust the spraying pressure until the parameters fed back by the material supply pressure sensor 6 and the spraying pressure sensor 11 are within the set range.

[0049] S3.4: When all parameters are within the set range, the preparation work is complete and the next spraying operation can be carried out.

[0050] S4: The ship's exterior is sprayed with paint. The supply unit 1 pumps the primer, which enters the spray gun 14 through the connecting pipes 5 and is then sprayed onto the ship's exterior. During the primer spraying process, the relay box 15 and the PLC client 16 monitor the changes in the sensor unit values ​​in real time.

[0051] S5: Clean after spraying;

[0052] S5.1: After the primer is sprayed on the ship's exterior in step S4, close the branch exhaust valve 2 of the gas pipeline 3 on the primer pump 102.

[0053] S5.2: Rotate the nozzle of the spray gun 14 to the cleaning state or pull out the nozzle, adjust the opening of the main exhaust valve of the air source to adjust the pressure of compressed air to 2-3 bar, and then close the main exhaust valve of the air source.

[0054] S5.3: Place the suction pipe of the primer pump 102 into the storage tank of the cleaning solvent, and the cleaning solvent can be recycled;

[0055] S5.4: Open the spray gun switch valve 12, the main exhaust valve of the air source, and the branch exhaust valve 2 of the gas pipeline 3 on the primer pump 102. The remaining primer in the corresponding primer connection pipeline 5 is discharged from the spray gun 14 into the waste bucket. When the primer is discharged and the cleaning solvent is seen to be discharged, the cleaning solvent should be discharged into the cleaning solvent storage tank for storage in time.

[0056] S5.5: After cleaning for 1-3 minutes, replace with clean cleaning solvent, and then clean for another 1-3 minutes. Pull the suction pipe of primer pump 102 out of the cleaning solvent storage tank, let primer pump 102 run dry for about 20 seconds, and then close the main exhaust valve of the air source and the corresponding branch exhaust valve 2 of primer pump 102.

[0057] S5.6: After the compressed air in the connecting pipe 5 has been released, close the spray gun switch valve 12, and then manually remove the cleaning nozzle, filter screen 9, primer pump screen 102, and suction pipe screen.

[0058] S6: After the primer dries, repeat steps S1-S5 to complete the topcoat spraying; after the topcoat dries, repeat steps S1-S5 to complete the anti-fouling paint spraying.

[0059] Preferably, in step S1, when the pressure of the gas source is not up to standard, the gas source needs to be repaired or replaced.

[0060] Preferably, in step S2.2, the current value set by the relay box 15 to the electro-proportional valve 13 is set according to the coating, and different coatings can be set with different current values.

[0061] Preferably, in step S3.1, when replacing the mixed primer, in order to ensure that the primer has good fluidity, the heater 17 can be turned on as needed. The heater 17 heats the primer in the discharge pipe of the primer pump 102 to ensure the fluidity of the primer.

[0062] Preferably, in step S3.3, the parameters detected by the spray pressure sensor 11 include static pressure value and dynamic pressure value. The static pressure value refers to the pressure when the spray gun 14 is closed and the paint in the connecting pipe 5 is not flowing, and the dynamic pressure value refers to the pressure when the spray gun 14 is open and the paint in the connecting pipe 5 is flowing. Under normal circumstances, the dynamic pressure value is not greater than the static pressure value.

[0063] Preferably, in step S4, during the primer spraying process, the relay box 15 and PLC client 16 monitor the values ​​of the sensor units in real time, including the material supply pressure value detected by the material supply pressure sensor 6, the dynamic pressure value detected by the spraying pressure sensor 11, and the static pressure value.

[0064] The setting range of the material supply pressure during spraying needs to be comprehensively evaluated based on the parameters of the coating and relevant experiments. Different types of coatings can be set with different parameters. During spraying, the setting range of the material supply pressure should be adjusted according to the actual coating used. Monitoring of the material supply pressure should be carried out during normal spraying, but not during cleaning, circulation, material discharge, or unclogging. In addition, due to the lag in the pressurization process, the judgment signal of the material supply pressure sensor 6 needs to be maintained for a certain period of time.

[0065] The dynamic pressure value detected by the spray pressure sensor 11 is dynamic data and is the main data parameter monitored by the spray pressure sensor 11 during normal spraying. During normal spraying, the dynamic pressure value is affected by the nozzle, the length of the connecting pipe 5, and the viscosity of the paint, etc. Therefore, the set range of the dynamic pressure value needs to be obtained through actual testing. During spraying, the dynamic pressure value will fluctuate normally due to the influence of equipment and compressed air. When the dynamic pressure value detected by the spray pressure sensor 11 is less than the set range, it will cause uneven paint atomization; when the dynamic pressure value detected by the spray pressure sensor 11 is greater than the set range, it may cause overspray. Therefore, the set range of the dynamic pressure value needs to be evaluated through actual testing. In addition, when the spray pressure sensor 11 detects a spray pressure value greater than the set range, after ruling out a problem with the pressure regulating valve 10, it can be identified as an increase in spray pressure caused by blockage of the spray gun 14. However, since the spray gun 14 can be completely blocked or partially blocked, when the detected spray pressure value is greater than the set range value, it needs to be dealt with in a timely manner.

[0066] The static pressure value detected by the spray pressure sensor 11 is basic data and a necessary condition to be met before normal spraying. The static pressure value must be greater than the set range of the spray pressure sensor 11. When the static pressure value falls below the set range of the spray pressure sensor 11, an alarm should be triggered and the fault should be resolved.

[0067] This utility model relates to a ship exterior spraying system and method. The ship's exterior requires sequential spraying of primer, intermediate coat, topcoat, and antifouling paint. After each coat is applied, the connecting pipes 5 and spray guns 14 must be cleaned to prevent clogging from residual paint and to ensure the purity of each coat, preventing different coats from affecting the spraying effect and quality. This application includes a control unit and a sensor unit to monitor and control the spraying process in real time, ensuring the spraying effect and quality.

[0068] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0069] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A ship exterior coating system, characterized in that: It includes a material supply unit (1), a control unit, a sensor unit, a spray gun (14) and several connecting pipes (5). The material supply unit (1) is connected to the spray gun (14) through several connecting pipes (5). The sensor unit and the control unit are both set on several connecting pipes (5) and are used to monitor and control the spraying process and the cleaning process. The feeding unit (1) can supply paint for spraying the exterior of a ship to the spray gun (14), or supply cleaning solvent for cleaning the connecting pipe (5) and the spray gun (14).

2. The ship exterior coating system according to claim 1, characterized in that: The feeding unit (1) includes a drive source, several spray pumps and a material tank. The suction pipe of the spray pump is placed in the material tank. The discharge pipe of the spray pump is connected to the connecting pipe (5). The drive source is connected to the spray pump and is used to drive the spray pump to pump the paint or cleaning solvent in the suction pipe to the discharge pipe.

3. The ship exterior coating system according to claim 2, characterized in that: The driving source is an air source, and the air source is equipped with a main exhaust valve and a pressure gauge (4). The main exhaust valve is connected to the spray pump through a gas pipeline (3). The pressure of the spray pump discharge pipe is adjusted by controlling the opening of the main exhaust valve. The pressure gauge (4) is used to monitor the pressure of the gas discharged from the main exhaust valve.

4. The ship exterior coating system according to claim 2 or 3, characterized in that: The spraying pumps include a standby pump (101), a primer pump (102), a topcoat pump (103), and an antifouling pump (104). The primer pump (102) is used to pump the primer intermediate coat, which is directly applied to the exterior of the ship. The topcoat pump (103) is used to pump the topcoat, which is applied over the dried primer intermediate coat. The antifouling pump (104) is used to pump the antifouling paint, which is applied over the dried topcoat. The standby pump (101) is used for temporary backup. There are several spray guns (14), and a distribution block (8) is also provided on the connecting pipe (5). The distribution block (8) is used to distribute cleaning solvent or different types of coatings into several spray guns (14).

5. The ship exterior coating system according to claim 3, characterized in that: A branch exhaust valve (2) is also provided on the gas pipeline (3) between the main exhaust valve and the spraying pump. The branch exhaust valve (2) is used to control the opening and closing state of the gas pipeline (3) connected to the spraying pump.

6. The ship exterior coating system according to claim 2, characterized in that: The feeding unit (1) also includes a heater (17) for regulating the temperature of the coating.

7. The ship exterior coating system according to claim 1, characterized in that: The control unit includes a relay box (15), a pneumatic switch valve (7), a pressure regulating valve (10), and a spray gun switch valve (12). The relay box (15) is used to control the working status of the pneumatic switch valve (7), the pressure regulating valve (10), and the spray gun switch valve (12). The pneumatic switch valve (7) is used to control the opening and closing of the connecting pipe (5) at the discharge end of the feeding unit (1); the pressure regulating valve (10) is used to regulate the pressure of the paint being delivered to the spray gun (14); the spray gun switch valve (12) is used to control the opening and closing of the spray gun (14); in the spraying state, the paint can pass through the pneumatic switch valve (7), the pressure regulating valve (10), and the spray gun switch valve (12) in sequence, and be sprayed out from the spray gun (14).

8. The ship exterior coating system according to claim 7, characterized in that: An electro-proportional valve (13) is provided on the pressure regulating valve (10). The electro-proportional valve (13) is connected to the relay box (15) and is used to control the pressure of the paint or cleaning solvent passing through the pressure regulating valve (10).

9. The ship exterior coating system according to claim 7, characterized in that: A filter (9) is also provided between the pneumatic switch valve (7) and the pressure regulating valve (10), and the filter (9) is used to filter impurities in the coating or cleaning solvent.

10. The ship exterior coating system according to claim 1, characterized in that: The sensor unit includes a feeding pressure sensor (6) and a spraying pressure sensor (11). The feeding pressure sensor (6) is located at the discharge end of the feeding unit (1) and is used to monitor the pressure at the discharge end of the feeding unit (1). The spraying pressure sensor (11) is located at the feed end of the spray gun (14) and is used to monitor the pressure at the feed end of the spray gun (14).

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