Pipe cleaning method

Abstract

The application provides a pipe cleaning method, which comprises the following steps: obtaining the type of residual paint in the pipe; filling the pipe with a first solvent according to the type, so as to discharge the residual paint in the pipe, the residual paint being soluble in the first solvent; after the residual paint in the pipe is discharged, circulating the first solvent in the pipe for a first preset time, so as to clean the pipe; filling the pipe with a second solvent, so as to discharge the first solvent in the pipe, the first solvent or the residual paint being soluble in the second solvent; after the first solvent in the pipe is discharged, circulating the second solvent in the pipe for a second preset time, so as to clean the pipe; filling the pipe with a flushing liquid; after the second solvent in the pipe is discharged, circulating the flushing liquid in the pipe for a third preset time; and discharging the flushing liquid from the pipe. The technical scheme of the application guarantees the cleanliness of the pipe cleaning and reduces the occurrence of poor coating surface quality.

Description

Technical Field

[0001] This invention relates to the field of automotive coating technology, and in particular to a method for cleaning piping. Background Technology

[0002] In existing automotive painting workshops, paints need to be replaced frequently due to vehicle model updates and other reasons.

[0003] In existing technologies, the cleaning process typically involves first purging residual paint from the piping with air, then filling the piping with organic solvents for cleaning, followed by cleaning with ethylene glycol butyl ether, and finally rinsing with pure water. These existing cleaning methods are prone to causing defects in vehicle body quality, such as color differences and pinholes. Summary of the Invention

[0004] The main objective of this invention is to provide a piping cleaning method that aims to solve the technical problems of poor vehicle body quality caused by existing cleaning methods, such as color difference and pinholes.

[0005] To achieve the above objectives, the present invention proposes a piping cleaning method, the piping cleaning method comprising:

[0006] Determine the type of paint remaining in the piping;

[0007] The piping is filled with a first solvent according to the type of solvent to discharge any remaining paint in the piping, wherein the remaining paint is soluble in the first solvent.

[0008] After the remaining paint in the piping is discharged, the first solvent is allowed to circulate in the piping for a first preset time to clean the piping.

[0009] The piping is filled with a second solvent to discharge the first solvent from the piping, wherein the first solvent or the remaining paint is soluble in the second solvent;

[0010] After the first solvent in the piping is discharged, the second solvent is circulated in the piping for a second preset time to clean the piping.

[0011] Fill the piping with flushing fluid to drain the second solvent or the remaining paint from the piping;

[0012] After the second solvent in the piping is discharged, the flushing liquid is circulated in the piping for a third preset time to clean the piping.

[0013] The flushing fluid is discharged from the piping.

[0014] Optionally, the step of filling the piping with the first solvent according to the type includes:

[0015] Connect both ends of the piping to the supply device to form a loop;

[0016] Add the first solvent to the supply device;

[0017] The first solvent is pressurized into the piping via the supply device.

[0018] Optionally, the supply device includes a supply tank, a pump, and a filter, wherein the supply tank, the pump, and the filter are connected by a pipeline;

[0019] After the remaining paint in the piping is discharged, and the first solvent is allowed to circulate in the piping for a first preset time, the method further includes:

[0020] Remove the piping from the supply device;

[0021] The filter element and the supply tank are cleaned;

[0022] After cleaning, one end of the piping is connected to the supply tank, and the other end is connected to the filter element to form the loop.

[0023] Optionally, before the step of draining the flushing fluid from the piping, the method further includes:

[0024] The turbidity of the rinsing solution was measured;

[0025] When the turbidity is greater than or equal to the preset turbidity, the piping needs to be cleaned again.

[0026] When the turbidity is less than the preset turbidity, the step of draining the flushing fluid from the piping is performed.

[0027] Optionally, when the type is intermediate paint, the first solvent corresponds to pure water, the second solvent corresponds to oil-based thinner, and the rinsing liquid corresponds to water-based thinner;

[0028] When the remaining paint is varnish, the first solvent and the second solvent correspond to oil-based thinner, and the rinsing liquid corresponds to a diluent;

[0029] When the remaining paint is a solid color paint, the first solvent corresponds to water-based thinner, the second solvent corresponds to pure water, and the rinsing liquid corresponds to water-based resin.

[0030] When the remaining paint is metallic paint, the first solvent corresponds to pure water, the second solvent corresponds to water-based thinner, and the rinsing solution corresponds to pure water.

[0031] Optionally, when the type is the intermediate coat paint, the solid color paint, or the metallic paint, after the step of draining the rinsing fluid from the piping, the method further includes:

[0032] Compressed air is injected into the piping to dry it.

[0033] Optionally, when the type is the intermediate coat paint, the solid color paint, or the metallic paint, the step of draining the rinsing fluid from the piping includes:

[0034] Fill the piping with water-based thinner to allow the flushing fluid or residual impurities to drain from the piping, and allow the water-based thinner to circulate in the piping for a fourth preset time.

[0035] Fill the pipe with pure water to drain the water-based thinner from the pipe and allow the pure water to circulate in the pipe for a fifth preset time.

[0036] Pure water is discharged from the piping.

[0037] Optionally, when the type is the intermediate coat paint, before the step of filling the piping with water-based thinner, the method further includes:

[0038] Fill the piping with pure water so that the flushing fluid is discharged from the piping and the pure water circulates in the piping for a sixth preset time.

[0039] Optionally, when the type is the solid color paint, before the step of filling the pipe with water-based thinner, the method further includes:

[0040] Fill the piping with pure water so that the flushing fluid is discharged from the piping and the pure water circulates in the piping for a seventh preset time.

[0041] The piping is filled with aqueous resin so that pure water is discharged from the piping and the aqueous resin circulates in the piping for an eighth preset time.

[0042] Fill the piping with pure water so that the water-based resin is discharged from the piping and the pure water circulates in the piping for a ninth preset time.

[0043] Optionally, after the step of draining the flushing fluid from the piping, the method further includes:

[0044] New paint was added back into the piping.

[0045] The technical solution of this invention specifies a cleaning scheme for the piping. For different materials of the remaining paint in the piping, different first solvents, second solvents, and rinsing solutions are used for deep cleaning, thereby ensuring the cleanliness of the piping and reducing the occurrence of poor coating quality. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0047] Figure 1 This is a schematic flowchart of the first embodiment of the piping cleaning method of the present invention;

[0048] Figure 2 This is a schematic flowchart of the second embodiment of the piping cleaning method of the present invention;

[0049] Figure 3 This is a schematic flowchart of the third embodiment of the piping cleaning method of the present invention;

[0050] Figure 4 This is a schematic flowchart of the fourth embodiment of the piping cleaning method of the present invention;

[0051] Figure 5 This is a schematic flowchart of the fifth embodiment of the piping cleaning method of the present invention;

[0052] Figure 6 This is a schematic flowchart of the sixth embodiment of the piping cleaning method of the present invention;

[0053] Figure 7 This is a schematic flowchart of the seventh embodiment of the piping cleaning method of the present invention;

[0054] Figure 8 This is a schematic flowchart of the eighth embodiment of the piping cleaning method of the present invention. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0057] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0060] This invention proposes a piping cleaning method, please refer to... Figure 1 , Figure 1 This is a schematic flowchart of the first embodiment of the piping cleaning method of the present invention, which includes the following steps:

[0061] Step S10: Obtain the type of paint remaining in the piping;

[0062] Step S20: Fill the piping with the first solvent according to the type;

[0063] Step S30: After the remaining paint in the piping is discharged, the first solvent is allowed to circulate in the piping for a first preset time.

[0064] Step S40: Fill the piping with the second solvent;

[0065] Step S50: After the first solvent in the piping is discharged, the second solvent is allowed to circulate in the piping for a second preset time.

[0066] Step S60: Fill the piping with flushing fluid;

[0067] Step S70: After the second solvent in the piping is discharged, the flushing liquid is allowed to circulate in the piping for a third preset time.

[0068] Step S80: Discharge the flushing fluid from the piping.

[0069] When it is necessary to replace the paint, first identify the type of residual paint left after the previous application of paint to the piping.

[0070] Depending on the type, the first solvent is filled into the piping, ensuring that the first solvent completely fills the piping. The first solvent is preferably a solvent capable of dissolving the remaining paint, so that the remaining paint dissolves in the first solvent and flows out with it.

[0071] When there is a large amount of paint remaining in the piping, the piping should be filled with the first solvent, and under the pressure of the first solvent, the remaining paint in the piping should be squeezed out of the piping.

[0072] After the remaining paint is expelled, the first solvent continues to fill the piping, causing it to circulate within the piping. During this flow, the first solvent washes away any remaining paint or stubborn stains adhering to the inner wall of the piping, further improving the cleaning effect.

[0073] To save on cleaning costs, in this embodiment, the piping can be connected to a circuit containing the first solvent, where the first solvent circulates and flushes the piping. This allows for the recycling of the first solvent and avoids waste.

[0074] To ensure effective cleaning, the duration for which the first solvent circulates in the piping is set to the preset duration, such as 2 to 3 hours or up to 24 hours. This prolonged flushing of the piping's inner wall with the first solvent ensures complete removal of any remaining paint residue.

[0075] It should be noted that the duration of the first solvent circulation rinse needs to be adjusted accordingly for the remaining paint of different materials.

[0076] After the first solvent cleaning is completed, the pipe is continuously filled with the second solvent. The second solvent is preferably a solvent that can dissolve the remaining paint and can dissolve or dilute the first solvent. Thus, both the remaining paint and the first solvent are dissolved in the second solvent and flow out with the second solvent.

[0077] Alternatively, the second solvent may be a solvent capable of diluting or dissolving the first solvent, and the second solvent may fill the entire piping, thereby expelling any remaining first solvent from the piping under the pressure of the second solvent.

[0078] To ensure effective cleaning, the second solvent is circulated in the piping for a predetermined duration, such as 20 to 24 hours. This prolonged rinsing with the second solvent ensures that any residual first solvent or paint in the piping is completely removed.

[0079] After the second solvent cleaning is completed, the flushing fluid is filled into the piping. The flushing fluid fills the entire piping and, under the pressure of the flushing fluid, forces out any remaining second solvent from the piping.

[0080] The flushing solution is circulated within the piping, and the duration of this circulation can be set to the third preset duration, such as within 24 hours. This prolonged flushing with the flushing solution effectively removes any remaining paint residue from the inner wall of the piping.

[0081] After the rinsing solution has finished cleaning, it is drained from the piping. Once the piping is dry, it can be reused. The rinsing action of the first solvent, the second solvent, and the rinsing solution ensures that any remaining paint residue in the piping is completely removed, thus preventing any interaction between the residual paint and the newly added paint that could degrade the paint coating quality.

[0082] The technical solution of this invention specifies a cleaning scheme for the piping. For different materials of the remaining paint in the piping, different first solvents, second solvents, and rinsing solutions are used for deep cleaning, thereby ensuring the cleanliness of the piping and reducing the occurrence of poor coating quality.

[0083] Further, please refer to Figure 2 , Figure 2 This is a schematic flowchart of the second embodiment of the piping cleaning method of the present invention. Step S20 includes:

[0084] Step S21: Connect both ends of the piping to the supply device to form a loop;

[0085] Step S22: Add the first solvent to the supply device;

[0086] Step S23: The first solvent is pressurized into the piping through the supply device.

[0087] The replenishment device is used to store the first solvent, the second solvent, or the rinsing solution.

[0088] During cleaning, the first solvent is first added to the replenishment device, and the two ends of the piping are connected to the outlet and inlet of the replenishment device, respectively, to form a loop.

[0089] The replenishment device drives the first solvent to circulate in the loop, thereby realizing the recycling of the first solvent, avoiding waste, and reducing cleaning costs.

[0090] The replenishment device is also provided with a waste outlet, through which the first solvent is discharged after the first solvent cleaning is completed.

[0091] After the first solvent is discharged, the second solvent is added to the replenishment device, and so on, until the rinsing solution is discharged from the waste port after the cleaning is completed.

[0092] Furthermore, the resupply device includes a resupply tank, a pump, and a filter, which are connected by pipelines.

[0093] Please refer to Figure 3 , Figure 3 This is a schematic flowchart of the third embodiment of the piping cleaning method of the present invention. After step S30, it further includes:

[0094] Step S110: Remove the piping from the supply device;

[0095] Step S120: Clean the filter element and the supply tank;

[0096] Step S130: After cleaning, connect one end of the piping to the supply tank and the other end to the filter to form the loop.

[0097] The pump pressurizes the solvent, causing the liquid to circulate in the circuit. The replenishment tank stores the liquid required for cleaning. An outlet and an inlet are located on the replenishment tank.

[0098] The filter element can be connected to the outlet through a pipeline, or it can be connected to the inlet through a pipeline, or the filter element can be installed at both the inlet and outlet.

[0099] When the liquid circulates in the circuit and washes away the remaining paint residue on the inner wall of the pipe, the impurities in the liquid can be filtered out by the filter element, thereby further improving the cleaning effect of the liquid during the circulation process.

[0100] As usage time increases, the supply tank and the filter element need to be cleaned to improve the filtration effect, remove internal impurities, and enhance the cleaning effect.

[0101] After the supply device is cleaned, the piping is reconnected to the supply device to form the loop, and subsequent cleaning operations continue.

[0102] Further, please refer to Figure 4 , Figure 4 This is a schematic flowchart of the fourth embodiment of the piping cleaning method of the present invention. Before step S80, the method further includes:

[0103] Step S91: Detect the turbidity of the rinsing solution;

[0104] Step S92: When the turbidity is greater than or equal to the preset turbidity, the piping is cleaned again;

[0105] Step S93: When the turbidity is less than the preset turbidity, the step of draining the flushing fluid from the piping is performed.

[0106] To ensure cleaning effectiveness, the flushing fluid in the piping needs to be inspected after cleaning. The turbidity of the flushing fluid can be detected by light irradiation, for example, by observing it with the naked eye using a flashlight. Based on experience, it can be judged whether the turbidity meets production standards, i.e., whether it is less than the preset turbidity level; alternatively, it can be detected and analyzed using a specialized turbidity detector.

[0107] When the turbidity is less than the preset turbidity, it means that the cleaning requirement is met and the subsequent operation continues; when the turbidity is greater than or equal to the preset turbidity, it means that the cleaning requirement has not been met and the piping is cleaned again.

[0108] The piping can be cleaned again by increasing the flushing time of the flushing fluid by increasing the third preset time; or by repeating steps S20 to S70 to clean the piping again.

[0109] The reliability and stability of the piping cleaning method of the present invention are improved by detecting the turbidity of the flushing fluid to determine whether the cleaning meets the requirements.

[0110] Furthermore, the piping cleaning method of the present invention can clean residual paint of various different materials. Moreover, when dealing with residual paint of different materials, the first solvent, the second solvent, and the rinsing liquid can be the same solvent or different solvents can be used for cleaning. For example:

[0111] In a first embodiment, when the remaining paint is intermediate color paint, the first solvent corresponds to pure water, the second solvent corresponds to oil-based thinner, and the rinsing liquid corresponds to water-based thinner.

[0112] In this embodiment, the first preset duration can be set to about 3 hours, the second preset duration can be set to about 20 hours, and the third preset duration can be set to about 24 hours.

[0113] In a second embodiment, when the remaining paint is varnish, the first solvent and the second solvent correspond to oil-based thinner, and the rinsing liquid corresponds to a diluent.

[0114] In this embodiment, the first preset duration can be set to approximately 24 hours, the second preset duration can be set to approximately 24 hours, and the third preset duration can be set to approximately 24 hours.

[0115] As a third embodiment, when the remaining paint is a solid color paint, the first solvent corresponds to water-based thinner, the second solvent corresponds to pure water, and the rinsing liquid corresponds to water-based resin.

[0116] In this embodiment, the first preset duration can be set to about 24 hours, the second preset duration can be set to about 2 hours, and the third preset duration can be set to about 24 hours.

[0117] In the fourth embodiment, when the remaining paint is metallic paint, the first solvent corresponds to pure water, the second solvent corresponds to water-based thinner, and the rinsing liquid corresponds to pure water.

[0118] In this embodiment, the first preset duration can be set to about 3 hours, the second preset duration can be set to about 24 hours, and the third preset duration can be set to about 2 hours.

[0119] Further, please refer to Figure 5 , Figure 5 This is a schematic flowchart of the fifth embodiment of the piping cleaning method of the present invention. When the remaining paint is the intermediate coat paint, the solid color paint, or the metallic paint, after step S80, the method further includes:

[0120] Step S100: Fill the piping with compressed air to dry the piping.

[0121] To accelerate the drying speed of the piping, compressed air is filled into the piping. Under the action of the airflow, the solvent evaporation is accelerated, thereby improving the drying effect and speed.

[0122] It is understood that oil-based thinner is chemically unstable. To avoid an explosion caused by static electricity generated when compressed air flows at high speed, the oil-based thinner is not dried using a method that involves filling it with compressed air. That is, compressed air is used for drying in the first, third, and fourth embodiments, but not in the second embodiment, thereby improving the safety of the piping cleaning method described in this invention.

[0123] Further, please refer to Figure 6 , Figure 6 This is a schematic flowchart of the sixth embodiment of the piping cleaning method of the present invention. When the remaining paint is the intermediate coat paint, the solid color paint, or the metallic paint, step S80 includes:

[0124] Step S81: Fill the piping with water-based thinner to allow the flushing fluid or residual impurities to drain from the piping, and allow the water-based thinner to circulate in the piping for a fourth preset time.

[0125] Step S82: Fill the pipe with pure water to drain the water-based thinner from the pipe and allow the pure water to circulate in the pipe for a fifth preset time.

[0126] Step S83: Discharge pure water from the piping.

[0127] In the first, third, and fourth embodiments, to further improve the cleaning effect, after the rinsing fluid is discharged, water-based thinner is continuously added to the replenishment device, and the rinsing fluid is squeezed out of the piping by the water-based thinner. The water-based thinner is then continuously circulated in the piping for 20 to 40 hours.

[0128] Finally, pure water is added to the supply device, which forces the water-based thinner out of the pipe and allows the pure water to circulate continuously in the pipe for about 2 hours to enhance the cleaning effect.

[0129] Further, please refer to Figure 7 , Figure 7 This is a schematic flowchart of the seventh embodiment of the piping cleaning method of the present invention. When the remaining paint is the intermediate color paint, before step S81, the method further includes:

[0130] Step S84: Fill the piping with pure water so that the flushing fluid is discharged from the piping and the pure water circulates in the piping for a sixth preset time.

[0131] In the first embodiment, in order to improve the cleaning effect, after the rinsing liquid is discharged, pure water is first added to the replenishment device to clean the pipe and squeeze out the rinsing liquid remaining in the pipe.

[0132] In this embodiment, the sixth preset time can be set to approximately 2 hours. Furthermore, after the sixth preset time, a turbidity test can be performed to confirm whether the cleaning meets the requirements, avoiding directly proceeding to steps S81-S83 if the requirements are not met, thus preventing waste of resources.

[0133] Further, please refer to Figure 8 , Figure 8 This is a schematic flowchart of the eighth embodiment of the piping cleaning method of the present invention. When the remaining paint is the solid color paint, before step S81, the method further includes:

[0134] Step S85: Fill the piping with pure water so that the flushing fluid is discharged from the piping and the pure water circulates in the piping for a seventh preset time.

[0135] Step S86: Fill the piping with water-based resin so that pure water is discharged from the piping and the water-based resin circulates in the piping for an eighth preset time.

[0136] Step S87: Fill the piping with pure water so that the water-based resin is discharged from the piping and the pure water circulates in the piping for a ninth preset time.

[0137] In the third embodiment, in order to improve the cleaning effect, after the rinsing fluid is discharged, pure water is first added to the replenishment device to drain the residual rinsing fluid in the piping.

[0138] The device is then cleaned with water-based resin. Water-based resin is added to the supply device for cleaning, and the pure water is forced out of the piping through the resin. Finally, pure water is added for further cleaning.

[0139] In this embodiment, the seventh preset duration can be set to approximately 2 hours. After the seventh preset duration, the eighth preset duration can be set to approximately 24 hours. The ninth preset duration can be set to approximately 2 hours. A turbidity test can be performed after step S86 to confirm whether the cleaning meets the requirements, avoiding directly proceeding to steps S87, S81, and S82 if the requirements are not met, thus preventing resource waste.

[0140] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A piping cleaning method, characterized in that, The piping cleaning method includes: Determine the type of paint remaining in the piping; The piping is filled with a first solvent according to the type of solvent to discharge any remaining paint in the piping, wherein the remaining paint is soluble in the first solvent. After the remaining paint in the piping is discharged, the first solvent is allowed to circulate in the piping for a first preset time to clean the piping. The piping is filled with a second solvent to discharge the first solvent from the piping, wherein the first solvent or the remaining paint is soluble in the second solvent; After the first solvent in the piping is discharged, the second solvent is circulated in the piping for a second preset time to clean the piping. Fill the piping with flushing fluid to drain the second solvent or the remaining paint from the piping; After the second solvent in the piping is discharged, the flushing liquid is circulated in the piping for a third preset time to clean the piping. The flushing fluid is drained from the piping. Prior to the step of draining the flushing fluid from the piping, the method further includes: The turbidity of the rinsing solution was measured; When the turbidity is greater than or equal to the preset turbidity, the piping needs to be cleaned again. When the turbidity is less than the preset turbidity, the step of draining the flushing fluid from the piping is performed; When the remaining paint is a mid-coat paint, the first solvent corresponds to pure water, the second solvent corresponds to oil-based thinner, and the rinsing liquid corresponds to water-based thinner. When the remaining paint is varnish, the first solvent and the second solvent are respectively oil-based thinner, and the rinsing liquid is respectively a diluent; When the remaining paint is a solid color paint, the first solvent corresponds to water-based thinner, the second solvent corresponds to pure water, and the rinsing liquid corresponds to water-based resin. When the remaining paint is metallic paint, the first solvent is pure water, the second solvent is water-based thinner, and the rinsing solution is pure water. When the remaining paint is the intermediate coat paint, the solid color paint, or the metallic paint, the step of draining the rinsing fluid from the piping includes: Fill the piping with water-based thinner to allow the flushing fluid or residual impurities to drain from the piping, and allow the water-based thinner to circulate in the piping for a fourth preset time. Fill the pipe with pure water to drain the water-based thinner from the pipe and allow the pure water to circulate in the pipe for a fifth preset time. Pure water is discharged from the piping.

2. The piping cleaning method according to claim 1, characterized in that, The step of filling the piping with the first solvent according to the type includes: Connect both ends of the piping to the supply device to form a loop; Add the first solvent to the supply device; The first solvent is pressurized into the piping via the supply device.

3. The piping cleaning method according to claim 2, characterized in that, The supply device includes a supply tank, a pump, and a filter element, which are connected by pipelines. After the remaining paint in the piping is discharged, and the first solvent is allowed to circulate in the piping for a first preset time, the method further includes: Remove the piping from the supply device; The filter element and the supply tank are cleaned; After cleaning, one end of the piping is connected to the supply tank, and the other end is connected to the filter element to form the loop.

4. The piping cleaning method according to claim 1, characterized in that, When the type is the intermediate coat paint, the solid color paint, or the metallic paint, after the step of draining the rinsing fluid from the piping, the method further includes: Compressed air is injected into the piping to dry it.

5. The piping cleaning method according to claim 1, characterized in that, When the type is the intermediate coat paint, before the step of filling the piping with water-based thinner, the method further includes: Fill the piping with pure water so that the flushing fluid is discharged from the piping and the pure water circulates in the piping for a sixth preset time.

6. The piping cleaning method according to claim 1, characterized in that, When the type is the solid color paint, before the step of filling the pipe with water-based thinner, the method further includes: Fill the piping with pure water so that the flushing fluid is discharged from the piping and the pure water circulates in the piping for a seventh preset time. The piping is filled with aqueous resin so that pure water is discharged from the piping and the aqueous resin circulates in the piping for an eighth preset time. Fill the piping with pure water so that the water-based resin is discharged from the piping and the pure water circulates in the piping for a ninth preset time.

7. The piping cleaning method according to any one of claims 1 to 6, characterized in that, After the step of draining the flushing fluid from the piping, the method further includes: New paint was added back into the piping.

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