CN115283374B - Cleaning method of solvent type paint conveying system - Google Patents
Cleaning method of solvent type paint conveying system Download PDFInfo
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- CN115283374B CN115283374B CN202210874377.4A CN202210874377A CN115283374B CN 115283374 B CN115283374 B CN 115283374B CN 202210874377 A CN202210874377 A CN 202210874377A CN 115283374 B CN115283374 B CN 115283374B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0328—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid by purging the pipe with a gas or a mixture of gas and liquid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a cleaning method of a solvent type paint conveying system. The invention discloses a method for preparing a composite material, which comprises the following steps: adding a diluent into a system to be cleaned, cleaning the system to be cleaned, discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, cleaning the system to be cleaned, discharging the alkaline solvent in the system to be cleaned, adding a hydrophilic solvent into the system to be cleaned, cleaning the system to be cleaned, discharging the hydrophilic solvent in the system to be cleaned, adding the diluent into the system to be cleaned, and cleaning the system to be cleaned; according to the invention, the solvent type paint delivery system to be cleaned is cleaned through the diluent, the alkaline solvent and the hydrophilic solvent respectively, so that residual solvent type paint accumulation and slag bonding in the solvent type paint delivery system to be cleaned are cleaned, and the problems of paint accumulation blockage and poor paint discharge of the solvent type paint delivery system are effectively avoided.
Description
Technical Field
The invention relates to the technical field of material cleaning, in particular to a cleaning method of a solvent type paint conveying system.
Background
Along with the development of society and scientific technology, the types of materials for automobile coating and spraying are more and more, the automobile coating and spraying process needs to carry out paint spraying operation from a solvent type coating material conveying system to a spray booth, and the problems of poor automobile coating and spraying effect caused by mixed pollution of different types of solvent type coatings are easy to occur, in order to avoid the spraying defect caused by deposition and slagging of various solvent type coatings in the paint conveying system, the solvent type coating material conveying system needs to be cleaned regularly, and the problems of blockage of pipelines of the solvent type coating material conveying system and poor solvent type coating spraying effect caused by incapability of cleaning accumulated paint and residual solvent type coating material slagging in the solvent type coating material conveying system at present.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a cleaning method of a solvent-based paint delivery system, which aims to solve the technical problems that in the prior art, accumulated paint and residual solvent-based paint slag in the solvent-based paint delivery system are effectively cleaned, so that a pipeline of the solvent-based paint delivery system is blocked, and the spraying effect of the solvent-based paint is poor.
In order to achieve the above object, the present invention provides a cleaning method of a solvent type paint delivery system, comprising the steps of:
adding a diluent into a system to be cleaned, and cleaning the system to be cleaned;
discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, and cleaning the system to be cleaned;
discharging the alkaline solvent in the system to be cleaned, adding a hydrophilic solvent into the system to be cleaned, and cleaning the system to be cleaned;
and discharging the hydrophilic solvent in the system to be cleaned, adding a diluent into the system to be cleaned, and cleaning the system to be cleaned.
Optionally, before adding the diluent to the system to be cleaned and cleaning the system to be cleaned, the method further includes:
discharging the solvent type paint in the system to be cleaned;
closing a pipe inlet valve of a circulating pump outlet filter of the system to be cleaned when the solvent type coating in the system to be cleaned is emptied;
introducing compressed air through a discharge port of a filter of a circulating pump of the system to be cleaned, wherein the air pressure of the compressed air is not lower than 4bar;
and blowing the system to be cleaned through the compressed air.
Optionally, the blowing the system to be cleaned by the compressed air includes:
grouping all pipelines in the system to be cleaned to obtain at least one pipeline group;
and blowing each pipeline group through the compressed air.
Optionally, the adding a diluent to the system to be cleaned and cleaning the system to be cleaned includes:
determining a diluent corresponding to the solvent-based paint according to paint information of the solvent-based paint in a system to be cleaned;
when the solvent type paint in the system to be cleaned is blown out, closing the valve of the compressed air and opening the valve of the filter of the system to be cleaned;
grouping all pipelines in the system to be cleaned to obtain at least one pipeline group;
adding the diluent into each pipeline group of the system to be cleaned;
and circularly cleaning each pipeline in the system to be cleaned, wherein the back pressure in each pipeline in the system to be cleaned is 3bar to 5bar.
Optionally, before the circulating cleaning is performed on each pipeline in the system to be cleaned, the method further includes:
disconnecting each pipeline in the system to be cleaned from the paint spraying unit corresponding to each pipeline;
and shorting the paint supply pipeline in each pipeline with the paint return pipeline in each pipeline.
Optionally, the discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, and cleaning the system to be cleaned, including:
discharging the diluent in the system to be cleaned through the compressed air;
adding an alkaline solvent into the system to be cleaned, wherein the alkaline solvent is an alkaline cleaning solvent, and the pH of the alkaline cleaning solvent is 10-13;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline of the system to be cleaned is 3bar to 5bar.
Optionally, the draining the alkaline solvent in the system to be cleaned, adding a hydrophilic solvent into the system to be cleaned, and cleaning the system to be cleaned, including:
discharging the alkaline solvent in the system to be cleaned through the compressed air;
adding a hydrophilic solvent into the system to be cleaned;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline of the system to be cleaned is 3bar to 5bar.
Optionally, after the system to be cleaned is cleaned in a circulating way, the method includes:
detecting connection states between each pipeline in the system to be cleaned and paint spraying units corresponding to each pipeline;
and when the connection state between each pipeline and the paint spraying unit corresponding to each pipeline is in a disconnection state, connecting each pipeline with the paint spraying unit.
Optionally, the draining the hydrophilic solvent in the system to be cleaned, adding a diluent into the system to be cleaned, and cleaning the system to be cleaned, including:
discharging the hydrophilic solvent in the system to be cleaned through the compressed air;
adding a diluent into a system to be cleaned;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline in the system to be cleaned is 3bar to 5bar.
Optionally, after the hydrophilic solvent in the system to be cleaned is discharged, a diluent is added into the system to be cleaned, and the system to be cleaned is cleaned, the method further includes:
detecting the cleanliness of the system to be cleaned, and judging whether the system to be cleaned meets preset cleaning conditions according to the cleanliness detection result;
if not, returning to the step of discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, and cleaning the system to be cleaned;
if yes, carrying out shrinkage cavity verification on the system to be cleaned, and judging whether the system to be cleaned meets the preset shrinkage cavity condition according to the shrinkage cavity verification result.
According to the invention, a diluent is added into a system to be cleaned, the system to be cleaned is cleaned, the diluent in the system to be cleaned is discharged, an alkaline solvent is added into the system to be cleaned, the system to be cleaned is cleaned, the alkaline solvent in the system to be cleaned is discharged, a hydrophilic solvent is added into the system to be cleaned, the system to be cleaned is cleaned, the hydrophilic solvent in the system to be cleaned is discharged, the diluent is added into the system to be cleaned, and the system to be cleaned is cleaned; according to the invention, the solvent type paint conveying system to be cleaned is cleaned through the diluent, so that most of residual solvent type paint in the system to be cleaned is cleaned, then the alkaline solvent is used for cleaning the system to be cleaned, so that the residual solvent type paint and the diluent in the system to be cleaned are cleaned, then the hydrophilic solvent is used for cleaning the system to be cleaned, so that the residual alkaline solvent in the system to be cleaned and the water generated in the alkaline solvent and cleaning process in the system to be cleaned are removed, and then the diluent is used for cleaning the system to be cleaned, so that the hydrophilic solvent is removed, so that the residual solvent type paint in the system to be cleaned and the deposited solvent type paint are cleaned, and the problem of poor paint discharge caused by paint accumulation blockage of the solvent type paint conveying system is effectively avoided.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of a cleaning method for a solvent-based paint delivery system according to the present invention;
FIG. 2 is a schematic flow chart of a second embodiment of a cleaning method for a solvent-based paint delivery system according to the present invention;
fig. 3 is a schematic flow chart of a third embodiment of a cleaning method of a solvent-based paint delivery system according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The existing cleaning method of the paint conveying system can not effectively clean accumulated paint and residual solvent paint slag in the solvent paint conveying system, so that the pipeline of the solvent paint conveying system is blocked, and the solvent paint spraying effect is poor.
In view of this, an embodiment of the present invention provides a method for cleaning a solvent-based paint delivery system, and referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of a method for cleaning a solvent-based paint delivery system according to the present invention.
In this embodiment, the cleaning method of the solvent type paint delivery system includes the following steps:
step S10: and adding a diluent into the system to be cleaned, and cleaning the system to be cleaned.
It should be understood that when the present embodiment is applied to a solvent-based paint delivery system for coating and spraying an automobile, a diluent is added to a system to be cleaned, the system to be cleaned is cleaned, an alkaline solvent is added to the system to be cleaned, the system to be cleaned is cleaned, the alkaline solvent is discharged from the system to be cleaned, a hydrophilic solvent is added to the system to be cleaned, the system to be cleaned is cleaned, the hydrophilic solvent is discharged from the system to be cleaned, the diluent is added to the system to be cleaned, and the system to be cleaned is cleaned.
The system to be cleaned may be a paint delivery system for delivering a solvent-based paint spray material for automotive paint spraying, and the solvent-based paint may be a solvent-based colored paint or a solvent-based varnish. The diluent may be a diluent solvent for the solvent-based paint in the system to be cleaned.
It should be appreciated that in order to effectively clean the solvent-based paint remaining in the system to be cleaned, the present embodiment adds the corresponding diluent to the system to be cleaned and starts the electric pump to circulate the pure diluent, the back pressure is maintained at 3-5bar to ensure that the diluent in the pipeline of the system to be cleaned can circulate, and the circulation time varies from 1h to 1 day. In order to minimize the amount of paint in the system, the diluent may be removed multiple times and a new diluent cycle may be re-added.
Further, in order to improve the diluent cleaning efficiency, the step S10 may include:
determining a diluent corresponding to the solvent-based paint according to paint information of the solvent-based paint in a system to be cleaned;
when the solvent type paint in the system to be cleaned is blown out, closing the valve of the compressed air and opening the valve of the filter of the system to be cleaned;
grouping all pipelines in the system to be cleaned to obtain at least one pipeline group;
adding the diluent into each pipeline group of the system to be cleaned;
and circularly cleaning each pipeline in the system to be cleaned, wherein the back pressure in each pipeline in the system to be cleaned is 3bar to 5bar.
It should be understood that, in this embodiment, to ensure the effect of diluent circulation, all the pipes in the system to be cleaned can be cleaned in groups during the diluent circulation; simultaneously, cleaning tank walls, a stirrer and disassembling and cleaning a pressure release pipeline of the electric pump (the pipeline is in a bypass state during normal cleaning); and carrying out short circuit bypass treatment on the pipeline of the spraying machine connected with each pipeline. After the short circuit, the pipeline of the paint delivery system can be circularly cleaned, the hose pipeline of the spraying machine connected with each pipeline can be connected with cleaning solvent used on site for flushing, and the cleaning solvent on site is disconnected after the solvent is basically colorless or paint residues are not discharged from the pipeline after flushing.
Step S20: and discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, and cleaning the system to be cleaned.
The alkaline solvent may be an alkaline cleaning solvent, for example, a mixed solvent of benzyl alcohol, ethylene glycol and a strong base, and the PH of the alkaline solvent may be between 10 and 13.
It should be understood that in this embodiment, the diluent in the system to be cleaned is discharged by compressed air (preferably, the diluent is discharged by blowing in groups as much as possible), the alkaline cleaning solvent is added for circulation and cleaning for 72-144 hours, the pH of the alkaline cleaning solvent is between 10-13, the back pressure is kept at 3-5bar, the pump-pumping circulation of the electric pump can be used, if the pump-pumping circulation of the electric pump is better, the alkaline cleaning solvent can be replaced every 24-48 hours for ensuring the cleaning effect.
Further, in order to effectively avoid corrosion of the spraying machine by the alkaline solvent, before the above-mentioned circulating cleaning of each pipeline in the system to be cleaned, the method may include:
disconnecting each pipeline in the system to be cleaned from the paint spraying unit corresponding to each pipeline;
and shorting the paint supply pipeline in each pipeline with the paint return pipeline in each pipeline.
It should be noted that, since the alkaline solvent may cause corrosion to the seal ring of the spraying machine pipeline connected to each pipeline in the system to be cleaned, before the alkaline solvent is added, the spraying machine pipeline needs to be subjected to a shorting bypass treatment (the shorting operation may be performed in step S10 or before the alkaline solvent is added). After the short circuit, each pipeline in the system to be cleaned can be cleaned in a circulating way, the hose pipeline of the spraying machine can be connected with a cleaning solvent used on site for flushing, and the on-site cleaning solvent is disconnected after the solvent is basically colorless after being discharged from the pipeline.
Further, in order to improve the cleaning efficiency of the alkaline solvent, the step S20 may include:
discharging the diluent in the system to be cleaned through the compressed air;
adding an alkaline solvent into the system to be cleaned, wherein the alkaline solvent is an alkaline cleaning solvent, and the pH of the alkaline cleaning solvent is 10-13;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline of the system to be cleaned is 3bar to 5bar.
In this embodiment, the diluent in the system to be cleaned is discharged by compressed air (preferably, the diluent is discharged by group blowing), the alkaline cleaning solvent is added for circulation cleaning for 72-144 hours, the PH of the alkaline cleaning solvent is between 10-13, the back pressure is kept at 3-5bar, the pump pumping circulation of the electric pump can be used, if the pump pumping circulation of the electric pump is better, the alkaline cleaning solvent can be replaced every 24-48 hours for ensuring the cleaning effect.
Further, in order to improve the cleaning efficiency, after the above-mentioned system to be cleaned is cleaned in a circulating manner, the method may include:
detecting connection states between each pipeline in the system to be cleaned and paint spraying units corresponding to each pipeline;
and when the connection state between each pipeline and the paint spraying unit corresponding to each pipeline is in a disconnection state, connecting each pipeline with the paint spraying unit.
It should be noted that, in this embodiment, before the spraying machine and the pipeline are reconnected to the main pipeline, the pipe supply hose may be connected to the pipe supply hard pipe first, the pipe supply valve is opened, the hydrophilic solvent in the system to be cleaned is used to perform hose flushing, each branch pipe discharges more than 5L, and then the hose is connected to the pipeline again.
Step S30: and discharging the alkaline solvent in the system to be cleaned, adding a hydrophilic solvent into the system to be cleaned, and cleaning the system to be cleaned.
The hydrophilic solvent may be a hydrophilic solvent of an alcohol mixture, or may be another type of hydrophilic solvent.
It should be understood that this embodiment discharges the alkaline cleaning solvent in the system to be cleaned by passing compressed air (preferably, the alkaline cleaning solvent is discharged as much as possible by performing a group blowing), and circulates the cleaning for 24 to 48 hours after the hydrophilic solvent is added. The back pressure is kept at 3-5bar to ensure the cleaning effect, and the hydrophilic solvent can be replaced once after 12-24 hours; restoring the robotic tubing, and the electric pump. Before the robot pipeline is connected back to the main pipeline, it is recommended to connect the hose to the hard pipe, open the valve, flush the hose with hydrophilic solvent in the system, discharge 5L or more from each branch pipe, and connect the hose back to the pipeline.
Further, in order to improve the cleaning efficiency of the hydrophilic solvent, the step S30 may include:
discharging the alkaline solvent in the system to be cleaned through the compressed air;
adding a hydrophilic solvent into the system to be cleaned;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline of the system to be cleaned is 3bar to 5bar.
In this embodiment, the compressed air is used to discharge the alkaline cleaning solvent in the system to be cleaned (preferably, the alkaline cleaning solvent is removed as much as possible by group blowing), and the hydrophilic solvent is added and then the system is cleaned for 24-48 hours. The back pressure is kept at 3-5bar to ensure the cleaning effect, and the hydrophilic solvent can be replaced once after 12-24 hours; restoring the robotic tubing, and the electric pump. Before the robot pipeline is connected back to the main pipeline, it is recommended to connect the hose to the hard pipe, open the valve, flush the hose with hydrophilic solvent in the system, discharge 5L or more from each branch pipe, and connect the hose back to the pipeline.
Step S40: and discharging the hydrophilic solvent in the system to be cleaned, adding a diluent into the system to be cleaned, and cleaning the system to be cleaned.
It should be noted that, in order to effectively clean the solvent-based paint and the hydrophilic solvent remaining in the system to be cleaned, the present embodiment adds the corresponding diluent into the system to be cleaned, and starts the electric pump to circulate the pure diluent, the back pressure is kept at 3-5bar, so as to ensure that the diluent in the pipeline of the system to be cleaned can circulate, and the circulation time varies from 1h to 1 day. In order to minimize the amount of paint in the system, the diluent may be removed multiple times and a new diluent cycle may be re-added.
Further, in order to improve the cleaning efficiency of the diluent, the step S40 may include:
discharging the hydrophilic solvent in the system to be cleaned through the compressed air;
adding a diluent into a system to be cleaned;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline in the system to be cleaned is 3bar to 5bar.
It should be noted that, in this embodiment, the corresponding diluent is added into the system to be cleaned, and the electric pump is started to circulate the pure diluent, and the back pressure is kept at 3-5bar, so as to ensure that the diluent in the pipeline of the system to be cleaned can circulate, and the circulation time varies from 1h to 1 day. In order to minimize the amount of paint in the system, the diluent may be removed multiple times and a new diluent cycle may be re-added.
According to the embodiment, the diluent is added into the system to be cleaned, the system to be cleaned is cleaned, the diluent in the system to be cleaned is discharged, the alkaline solvent is added into the system to be cleaned, the system to be cleaned is cleaned, the alkaline solvent in the system to be cleaned is discharged, the hydrophilic solvent is added into the system to be cleaned, the system to be cleaned is cleaned, the hydrophilic solvent in the system to be cleaned is discharged, the diluent is added into the system to be cleaned, and the system to be cleaned is cleaned; according to the invention, the solvent type paint conveying system to be cleaned is cleaned through the diluent, so that most of residual solvent type paint in the system to be cleaned is cleaned, then the alkaline solvent is used for cleaning the system to be cleaned, so that the residual solvent type paint and the diluent in the system to be cleaned are cleaned, then the hydrophilic solvent is used for cleaning the system to be cleaned, so that the residual alkaline solvent in the system to be cleaned and the water generated in the alkaline solvent and cleaning process in the system to be cleaned are removed, and then the diluent is used for cleaning the system to be cleaned, so that the hydrophilic solvent is removed, so that the residual solvent type paint in the system to be cleaned and the deposited solvent type paint are cleaned, and the problem of poor paint discharge caused by paint accumulation blockage of the solvent type paint conveying system is effectively avoided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a cleaning method of a solvent-based paint delivery system according to a second embodiment of the present invention.
Based on the first embodiment, in this embodiment, before step S10, the method includes:
step S1: discharging the solvent type paint in the system to be cleaned;
step S2: closing a pipe inlet valve of a circulating pump outlet filter of the system to be cleaned when the solvent type coating in the system to be cleaned is emptied;
step S3: introducing compressed air through a discharge port of a filter of a circulating pump of the system to be cleaned, wherein the air pressure of the compressed air is not lower than 4bar;
step S4: and blowing the system to be cleaned through the compressed air.
The solvent-based paint may be a paint that needs to be cleaned in a solvent-based paint delivery system to be cleaned.
It should be understood that, in this embodiment, the solvent-based paint in the system to be cleaned is discharged into the container storing the solvent-based paint and stored, in order to blow out the paint in each pipeline in the system to be cleaned as much as possible, after the solvent-based paint in the circulation tank of the system to be cleaned is evacuated, the valve of the inlet pipe of the pump outlet filter is closed, compressed air is introduced into the system to be cleaned through the discharge port below the filter, the paint in each pipeline in the system to be cleaned is blown out by using the compressed air, the pressure of the compressed air should be ensured to be above 4bar, and after the paint is blown out, the valve of the filter is opened, and step S10 is performed.
Further, in order to blow out the paint in each pipeline in the system to be cleaned as much as possible, the step S4 may include:
step S41: grouping all pipelines in the system to be cleaned to obtain at least one pipeline group;
step S42: and blowing each pipeline group through the compressed air.
It should be understood that, in this embodiment, each pipeline in the system to be cleaned is grouped, and the system branch pipelines of the spray gun station are blown in groups, so that the solvent-based paint in each branch pipeline is ensured to be blown out as much as possible, and the blowing-out standard of the solvent-based paint in the system to be cleaned is that the solvent-based paint at the outlet of the discharge pipeline only drops, so that the solvent-based paint is ensured not to flow down in a stranding manner.
In the embodiment, the solvent-based paint in the system to be cleaned is discharged, when the solvent-based paint in the system to be cleaned is emptied, a pipe inlet valve of a circulating pump outlet filter of the system to be cleaned is closed, compressed air is introduced through a discharge port of the circulating pump filter of the system to be cleaned, wherein the air pressure of the compressed air is not lower than 4bar, and the system to be cleaned is blown by the compressed air; according to the invention, the inlet pipe valve of the circulating pump outlet filter of the system to be cleaned is closed when the solvent-type paint in the system to be cleaned is emptied, and then compressed air is introduced through the discharge port of the circulating pump filter of the system to be cleaned, and the system to be cleaned is blown by the compressed air, so that the solvent-type paint in the system to be cleaned is blown out as much as possible, and the cleaning efficiency of the system is improved.
Referring to fig. 3, fig. 3 is a schematic flow chart of a cleaning method of a solvent-based paint delivery system according to a third embodiment of the present invention.
Based on the first embodiment, in the present embodiment, after the step S40, the method includes:
step S50: detecting the cleanliness of the system to be cleaned, and judging whether the system to be cleaned meets preset cleaning conditions according to the cleanliness detection result;
step S60: if not, returning to the step of discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, and cleaning the system to be cleaned;
step S70: if yes, carrying out shrinkage cavity verification on the system to be cleaned, and judging whether the system to be cleaned meets the preset shrinkage cavity condition according to the shrinkage cavity verification result.
The preset cleanliness condition may be preset to ensure that the filter bag in the system to be cleaned is colorless, no obvious metal powder exists, and no paint is deposited in the pipeline. The preset shrinkage cavity condition can be a condition for judging whether shrinkage cavity verification of the system to be cleaned meets the standard or not, for example, the verification scheme can be to take the diluent of the diluent liquid level in the tank and mix the diluent of the return pipeline, and the spray plate does not have shrinkage cavity or dent.
It should be appreciated that this embodiment, after cleaning the system to be cleaned by diluent circulation, unpacks the filter within the system to be cleaned, checking the filter bag and filter supply cleanliness; randomly disassembling and inspecting the cleanliness of the main pipeline interface and the branch pipe of the spraying gun station, wherein paint slag and color change of the filter bag are avoided in the filter bag; each disassembling and inspecting pipeline can use endoscopy, besides a small amount of paint slag is allowed to remain in areas with unsmooth circulation such as the corners of the ball valve, paint slag cannot appear in other reachable pipeline areas, if the requirements cannot be met, all or part of the steps from S10 to S40 are repeated for cleaning again, and a cleaning scheme can be judged according to the dirt degree, for example, only the step S40, the steps from S30 to S40, or the steps from S10 to S40 are executed.
After the system to be cleaned is cleaned, the cleanliness of the system to be cleaned can meet the requirement, shrinkage cavity verification can be performed, the verification scheme is to take the diluent of the diluent liquid level in the tank and mix the diluent of the return pipeline, shrinkage cavity or recess does not occur after the board is sprayed, if the requirement cannot be met, all or part of the steps from the step S10 to the step S40 are repeated for re-cleaning, and the re-cleaning scheme can be judged according to the number and the severity of shrinkage cavities, for example, only the step S40, the steps S30 to the step S40, the steps S10 to the step S40 and the like are executed.
According to the method, cleanliness detection is carried out on the system to be cleaned, whether the system to be cleaned meets preset cleaning conditions is judged according to the cleanliness detection result, if not, the method returns to the step of discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, and cleaning the system to be cleaned; if yes, carrying out shrinkage cavity verification on the system to be cleaned, and judging whether the system to be cleaned meets preset shrinkage cavity conditions according to a shrinkage cavity verification result; according to the method, the cleanliness detection is carried out on the system to be cleaned, whether the system to be cleaned meets the preset cleaning condition is judged according to the cleanliness detection result, so that the paint deposit in the system to be cleaned is ensured to be cleaned, then the shrinkage cavity verification is carried out on the system to be cleaned, whether the system to be cleaned meets the preset shrinkage cavity condition is judged according to the shrinkage cavity verification result, the shrinkage cavity verification of the system to be cleaned is ensured to reach the standard, and the problem that the paint deposit in the system to be cleaned is not detected, so that a pipeline is blocked is effectively avoided.
Claims (6)
1. The cleaning method of the solvent type paint delivery system is characterized by comprising the following steps of:
determining a diluent corresponding to the solvent-based paint according to paint information of the solvent-based paint in a system to be cleaned;
when the solvent type paint in the system to be cleaned is blown out, closing a valve of compressed air, and opening a filter valve of the system to be cleaned;
grouping all pipelines in the system to be cleaned to obtain at least one pipeline group;
adding the diluent into each pipeline group of the system to be cleaned;
carrying out circulating cleaning on each pipeline in the system to be cleaned, wherein the back pressure in each pipeline in the system to be cleaned is 3bar to 5bar;
discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, and cleaning the system to be cleaned, wherein the pH of the alkaline solvent is 10-13;
discharging the alkaline solvent in the system to be cleaned, adding a hydrophilic solvent into the system to be cleaned, and cleaning the system to be cleaned;
discharging the hydrophilic solvent in the system to be cleaned by compressed air;
adding a diluent into a system to be cleaned;
circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline in the system to be cleaned is 3bar to 5bar;
detecting the cleanliness of the system to be cleaned, and judging whether the system to be cleaned meets preset cleaning conditions according to the cleanliness detection result;
if not, returning to the step of discharging the diluent in the system to be cleaned, adding an alkaline solvent into the system to be cleaned, and cleaning the system to be cleaned;
if yes, carrying out shrinkage cavity verification on the system to be cleaned, and judging whether the system to be cleaned meets preset shrinkage cavity conditions according to a shrinkage cavity verification result;
after the system to be cleaned is circularly cleaned, the method comprises the following steps:
detecting connection states between each pipeline in the system to be cleaned and paint spraying units corresponding to each pipeline;
and when the connection state between each pipeline and the paint spraying unit corresponding to each pipeline is in a disconnection state, connecting each pipeline with the paint spraying unit.
2. The method of cleaning a solvent borne coating delivery system of claim 1, wherein said adding a diluent to a system to be cleaned and prior to cleaning said system to be cleaned, further comprises:
discharging the solvent type paint in the system to be cleaned;
closing a pipe inlet valve of a circulating pump outlet filter of the system to be cleaned when the solvent type coating in the system to be cleaned is emptied;
introducing compressed air through a discharge port of a filter of a circulating pump of the system to be cleaned, wherein the air pressure of the compressed air is not lower than 4bar;
and blowing the system to be cleaned through the compressed air.
3. The method of cleaning a solvent borne coating delivery system of claim 2, wherein said blowing said system to be cleaned with said compressed air comprises:
grouping all pipelines in the system to be cleaned to obtain at least one pipeline group;
and blowing each pipeline group through the compressed air.
4. The method for cleaning a solvent-borne coating delivery system of claim 1, further comprising, prior to said cyclically cleaning each of said lines in said system to be cleaned:
disconnecting each pipeline in the system to be cleaned from the paint spraying unit corresponding to each pipeline;
and shorting the paint supply pipeline in each pipeline with the paint return pipeline in each pipeline.
5. A method of cleaning a solvent borne coating delivery system according to any one of claims 1 to 3, wherein said draining said diluent from said system to be cleaned, adding an alkaline solvent to said system to be cleaned, and cleaning said system to be cleaned, comprises:
discharging the diluent in the system to be cleaned through the compressed air;
adding an alkaline solvent into the system to be cleaned, wherein the alkaline solvent is an alkaline cleaning solvent, and the pH of the alkaline cleaning solvent is 10-13;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline of the system to be cleaned is 3bar to 5bar.
6. A method of cleaning a solvent borne coating delivery system according to any one of claims 1 to 3, wherein said draining said alkaline solvent from said system to be cleaned, adding a hydrophilic solvent to said system to be cleaned, and cleaning said system to be cleaned, comprises:
discharging the alkaline solvent in the system to be cleaned through the compressed air;
adding a hydrophilic solvent into the system to be cleaned;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline of the system to be cleaned is 3bar to 5bar.
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| CN202210874377.4A CN115283374B (en) | 2022-07-22 | 2022-07-22 | Cleaning method of solvent type paint conveying system |
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| CN202210874377.4A CN115283374B (en) | 2022-07-22 | 2022-07-22 | Cleaning method of solvent type paint conveying system |
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| CN115283374B true CN115283374B (en) | 2023-07-18 |
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