CN115283374A - Cleaning method for solvent type coating paint conveying system - Google Patents
Cleaning method for solvent type coating paint conveying system Download PDFInfo
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- CN115283374A CN115283374A CN202210874377.4A CN202210874377A CN115283374A CN 115283374 A CN115283374 A CN 115283374A CN 202210874377 A CN202210874377 A CN 202210874377A CN 115283374 A CN115283374 A CN 115283374A
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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
Abstract
The invention discloses a cleaning method of a solvent type coating paint conveying system. The invention discloses: 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 coating paint conveying system to be cleaned is cleaned through the diluent, the alkaline solvent and the hydrophilic solvent, so that residual solvent type coating paint accumulation and slag formation in the system to be cleaned are cleaned, and the problems of paint accumulation blockage and poor paint discharge of the solvent type coating paint conveying 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 coating paint conveying system.
Background
With the progress of society and the development of science and technology, the variety of materials for automobile coating and spraying is more and more, a solvent type coating (namely a solvent type coating and spraying material) is required to be sprayed to a spraying room through a solvent type coating and paint conveying system in the automobile coating and spraying process, the solvent type coatings of different types are easy to generate mixed pollution to cause the problem of poor automobile coating and spraying effect, and 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 and paint conveying system is required to be cleaned regularly, so that the problems of pipeline blockage of the solvent type coating and paint conveying system and poor spraying effect of the solvent type coatings cannot be effectively cleaned at present.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a cleaning method of a solvent type coating conveying system, and aims to solve the technical problems that accumulated coating and residual solvent type coating slag in the solvent type coating conveying system are effectively cleaned by the prior art, so that a pipeline of the solvent type coating conveying system is blocked, and the spraying effect of the solvent type coating is poor.
In order to achieve the purpose, the invention provides a cleaning method of a solvent type coating paint conveying system, which comprises the following steps:
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 into the system to be cleaned and cleaning the system to be cleaned, the method further includes:
discharging the solvent type coating in the system to be cleaned;
when the solvent type coating in the system to be cleaned is exhausted, closing a pipe inlet valve of a circulating pump outlet filter of the system to be cleaned;
introducing compressed air through a discharge port of a circulating pump filter 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 by 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 group of pipeline groups;
and blowing air to each pipeline group through the compressed air respectively.
Optionally, adding a diluent to the system to be cleaned, and cleaning the system to be cleaned, includes:
determining a diluent corresponding to a solvent type coating according to coating information of the solvent type coating in a system to be cleaned;
when the solvent type coating in the system to be cleaned is completely blown, closing the valve of the 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 group of pipeline groups;
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 backpressure in each pipeline in the system to be cleaned is 3-5 bar.
Optionally, before performing the circulation cleaning 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 (4) short-connecting 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 to the system to be cleaned, and cleaning the system to be cleaned includes:
discharging the diluent in the system to be cleaned by 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 3-5 bar.
Optionally, the discharging the alkaline solvent in the system to be cleaned, adding a hydrophilic solvent to the system to be cleaned, and cleaning the system to be cleaned includes:
discharging the alkaline solvent in the system to be cleaned by 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 3-5 bar.
Optionally, after the cyclic cleaning of the system to be cleaned, the method includes:
detecting the connection state between each pipeline in the system to be cleaned and the paint spraying unit corresponding to each pipeline;
and when the connection state between each pipeline and the paint spraying unit corresponding to each pipeline is 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 includes:
discharging the hydrophilic solvent in the system to be cleaned by 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 3-5 bar.
Optionally, after the draining of the hydrophilic solvent in the system to be cleaned, the adding of a diluent into the system to be cleaned, and the cleaning of the system to be cleaned, the method further includes:
carrying out cleanliness detection on the system to be cleaned, and judging whether the system to be cleaned meets a preset clean condition or not according to a 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;
and if so, performing shrinkage cavity verification on the system to be cleaned, and judging whether the system to be cleaned meets a preset shrinkage cavity condition or not according to a shrinkage cavity verification result.
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 coating conveying system to be cleaned is cleaned through the diluent, so that most of residual solvent type coating in the system to be cleaned is cleaned, the system to be cleaned is cleaned through the alkaline solvent, so that residual solvent type coating and diluent in the system to be cleaned are cleaned, the system to be cleaned is cleaned through the hydrophilic solvent, so that residual alkaline solvent in the system to be cleaned, alkaline solvent in the system to be cleaned and water generated in the cleaning process are removed, the system to be cleaned is cleaned through the diluent, so that the hydrophilic solvent is removed, so that residual solvent type coating accumulated paint in the system to be cleaned and deposited solvent type coating slag are cleaned, and the problem of poor paint production caused by the blockage of the solvent type coating conveying system due to the paint accumulation is effectively avoided.
Drawings
FIG. 1 is a schematic flow chart illustrating 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 illustrating 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 illustrating a method for cleaning a solvent-based paint delivery system according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment 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 relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The existing cleaning method for the paint conveying system cannot effectively clean accumulated paint and residual solvent-based paint slag in the solvent-based paint conveying system, so that the problems of pipeline blockage of the solvent-based paint conveying system and poor spraying effect of the solvent-based paint are caused.
In view of this, an embodiment of the present invention provides a method for cleaning a solvent-based paint conveying system, and referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of the method for cleaning a solvent-based paint conveying system according to the present invention.
In this embodiment, the cleaning method for the solvent-based paint conveying 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 embodiment is applied to cleaning a solvent-based paint conveying system for automobile painting and spraying, 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, a diluent is added into the system to be cleaned, and the system to be cleaned is cleaned.
The system to be cleaned may be a paint conveying system for conveying a solvent type paint spray material for automobile paint spray, and the solvent type paint may be a solvent type paint or a solvent type varnish. The diluent may be a diluent solvent corresponding to the solvent-based coating in the system to be cleaned.
It should be understood that, in order to effectively clean the solvent-based paint remaining in the system to be cleaned, the present implementation adds a corresponding diluent to the system to be cleaned, and starts an electric pump to pump pure diluent to circulate, 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 is different from 1h to 1 day. To minimize the amount of coating in the system, the diluent may be removed multiple times and then recycled with fresh diluent.
Further, in order to improve the diluent cleaning efficiency, the step S10 may include:
determining a diluent corresponding to a solvent type coating according to coating information of the solvent type coating in a system to be cleaned;
when the solvent type coating in the system to be cleaned is completely blown, closing the valve of the 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 group of pipeline groups;
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 backpressure in each pipeline in the system to be cleaned is 3-5 bar.
It should be understood that, in order to ensure the diluent circulation effect, the diluent can be circulated to perform group cleaning on all the pipelines in the system to be cleaned; simultaneously, cleaning the tank wall, the stirrer and the pressure relief pipeline of the unpicking and cleaning electric pump (the pipeline is in a bypass state when being cleaned normally); and carrying out short-circuit bypass treatment on the pipeline of the spraying machine connected with each pipeline. After short connection, the paint conveying system pipeline can be cleaned circularly, the hose pipeline of the spraying machine connected with each pipeline can be connected with a cleaning solvent used on site for washing, and the cleaning solvent on site is cut off after the solvent discharged from the pipeline is basically colorless or no paint residue exists.
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.
It is noted that 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 10 to 13.
It should be understood that in this embodiment, compressed air is used to expel the diluent in the system to be cleaned (preferably, a group of air blows are performed to remove the diluent as much as possible), the alkaline cleaning solvent is added for cleaning for 72-144 hours in a circulating manner, the pH of the alkaline cleaning solvent is 10-13, the back pressure is maintained at 3-5bar, an electric pump can be used for pumping circulation, such as a high-flow diaphragm pump can be used for pumping circulation, and the alkaline cleaning solvent can be replaced every 24-48 hours to ensure the cleaning effect.
Further, in order to effectively prevent the spraying machine from being corroded by the alkaline solvent, before the circulation cleaning of the pipelines 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 (4) short-connecting the paint supply pipeline in each pipeline with the paint return pipeline in each pipeline.
It should be noted that, since the alkaline solvent corrodes the sealing ring of the pipeline of the spraying machine connected to each pipeline in the system to be cleaned, the pipeline of the spraying machine needs to be subjected to a short-circuit bypass process before the alkaline solvent is added (the short-circuit operation may be performed in step S10, or may be performed before the alkaline solvent is added). After short connection, all pipelines in the system to be cleaned can be cleaned circularly, the hose pipeline of the spraying machine can be connected with a cleaning solvent used on site for cleaning, and the cleaning solvent is disconnected after the cleaning solvent is basically colorless after the cleaning solvent is 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 by 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 to 13;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline of the system to be cleaned is 3-5 bar.
It should be noted that, in this embodiment, compressed air is used to exhaust the diluent in the system to be cleaned (preferably, group blowing is performed to remove the diluent as much as possible), alkaline cleaning solvent is added to perform cyclic cleaning for 72-144 hours, the PH of the alkaline cleaning solvent is 10-13, the back pressure is maintained at 3-5bar, an electric pump can be used for pumping circulation, such as a large-flow diaphragm pump can be used for pumping circulation, and the alkaline cleaning solvent can be replaced every 24-48 hours to ensure the cleaning effect.
Further, in order to improve the cleaning efficiency, after the above-mentioned cyclic cleaning of the system to be cleaned, the method may include:
detecting the connection state between each pipeline in the system to be cleaned and the paint spraying unit corresponding to each pipeline;
and when the connection state between each pipeline and the paint spraying unit corresponding to each pipeline is 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 supply hose can be connected to the supply hose hard pipe, the supply valve is opened, the hydrophilic solvent in the system to be cleaned is used to wash the hose, each branch pipe discharges more than 5L, and then the hose return pipe is connected to the pipeline.
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 the present embodiment discharges the alkaline cleaning solvent in the system to be cleaned by compressed air (preferably, it is performed by blowing air in groups to remove the alkaline cleaning solvent as much as possible), and circulates the cleaning for 24 to 48 hours after adding the hydrophilic solvent. 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; a rehabilitation robot line, and an electric pump. Before the robot pipeline is reconnected to the main pipeline, it is proposed to connect the hose of the supply pipe to the hard pipe of the supply pipe, open the valve of the supply pipe, use the hydrophilic solvent in the system to wash the hose, discharge more than 5L in each branch pipe, and connect the return pipe of the hose to the main 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 by 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 3-5 bar.
It should be noted that, in this embodiment, compressed air is used to exhaust the alkaline cleaning solvent in the system to be cleaned (preferably, air is blown in groups to remove the alkaline cleaning solvent as much as possible), and the hydrophilic solvent is added and then the cleaning is circulated 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; a rehabilitation robot line, and an electric pump. Before the robot pipeline is reconnected to the main pipeline, it is proposed to connect the hose of the supply pipe to the hard pipe of the supply pipe, open the valve of the supply pipe, use the hydrophilic solvent in the system to wash the hose, discharge more than 5L in each branch pipe, and connect the return pipe of the hose to the main 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 remained in the system to be cleaned, the present implementation adds a corresponding diluent into the system to be cleaned, and starts an electric pump to pump pure diluent for circulation, 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 be circulated, and the circulation time is different from 1h to 1 day. To minimize the amount of coating in the system, the diluent may be removed multiple times and then recycled with fresh diluent.
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 by 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 3-5 bar.
It should be noted that, in this embodiment, a corresponding diluent is added into the system to be cleaned, and the electric pump is started to pump pure diluent for circulation, and the back pressure is maintained 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 is different from 1h to 1 day. To minimize the amount of coating in the system, the diluent may be removed multiple times and then recycled with fresh diluent.
In this embodiment, 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 and 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 coating conveying system to be cleaned is cleaned through the diluent, so that most of residual solvent type coating in the system to be cleaned is cleaned, the system to be cleaned is cleaned through the alkaline solvent, so that residual solvent type coating and diluent in the system to be cleaned are cleaned, the system to be cleaned is cleaned through the hydrophilic solvent, so that residual alkaline solvent in the system to be cleaned, alkaline solvent in the system to be cleaned and water generated in the cleaning process are removed, the system to be cleaned is cleaned through the diluent, so that the hydrophilic solvent is removed, so that residual solvent type coating accumulated paint in the system to be cleaned and deposited solvent type coating slag are cleaned, and the problem of poor paint production caused by the blockage of the solvent type coating conveying system due to the paint accumulation is effectively avoided.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating 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 the step S10, the method includes:
step S1: discharging the solvent type coating in the system to be cleaned;
step S2: when the solvent type coating in the system to be cleaned is exhausted, closing a pipe inlet valve of a circulating pump outlet filter of the system to be cleaned;
and step S3: introducing compressed air through a discharge port of a circulating pump filter of the system to be cleaned, wherein the air pressure of the compressed air is not lower than 4bar;
and step S4: and blowing the system to be cleaned by the compressed air.
It should be noted that the solvent-based paint may be a paint to be cleaned in a solvent-based paint system to be cleaned.
It should be understood that, in this embodiment, the solvent-based coating in the system to be cleaned is discharged into the container storing the solvent-based coating, in order to blow out the coating in each pipeline in the system to be cleaned as much as possible, after the solvent-based coating in the circulation tank of the system to be cleaned is evacuated, the pipe inlet valve 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 coating in each pipeline in the system to be cleaned is blown out by using the compressed air, in order to ensure the effect, the pressure of the compressed air needs to be ensured to be above 4bar, after the coating is blown out, the compressed air valve is closed, the filter valve is opened, and step S10 is executed.
Further, in order to blow out the coating 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 group of pipeline groups;
step S42: and blowing air to each pipeline group through the compressed air respectively.
It should be understood that, in this embodiment, the pipelines in the system to be cleaned are grouped, and the branch pipelines of the system in the paint gun station are blown in groups, so as to ensure that the solvent-based paint in each branch is blown out as much as possible, and the solvent-based paint in the system to be cleaned is blown out only by dripping and ensuring that no flow is formed.
In the embodiment, the solvent type coating in a system to be cleaned is discharged, when the solvent type coating in the system to be cleaned is discharged, 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 through the compressed air; according to the invention, the inlet pipe valve of the outlet filter of the circulating pump of the system to be cleaned is closed when the solvent type coating in the system to be cleaned is emptied, the compressed air is introduced through the discharge outlet 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 coating in the system to be cleaned is blown out as far as possible, and the cleaning efficiency of the system is improved.
Referring to fig. 3, fig. 3 is a schematic flow chart illustrating a cleaning method of a solvent-based paint delivery system according to a third embodiment of the present invention.
Based on the first embodiment described above, in the present embodiment, after the step S40, the method includes:
step S50: carrying out cleanliness detection on the system to be cleaned, and judging whether the system to be cleaned meets a preset clean condition or not according to a 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: and if so, carrying out shrinkage cavity verification on the system to be cleaned, and judging whether the system to be cleaned meets a preset shrinkage cavity condition or not according to a shrinkage cavity verification result.
It should be noted that the preset cleanliness condition may be a preset condition for ensuring that the filter bag in the system to be cleaned is colorless, has no obvious metal powder, and has no paint accumulation in the pipeline. The preset shrinkage cavity condition can be a condition for judging whether the shrinkage cavity verification of the system to be cleaned reaches the standard, for example, the verification scheme can be that the diluent of the diluent liquid level in the tank and the diluent of the return pipeline are taken for paint mixing, and the plate is sprayed without shrinkage cavity or depression.
It should be understood that, after the system to be cleaned is cleaned by the diluent circulation, the filter in the system to be cleaned is disassembled, and the cleanliness of the filter bag and the filter supply pipe is checked; the cleanliness of the main pipeline interface and the branch pipes of the spraying gun station is randomly inspected, and paint residues and discoloration of the filter bag are required to be avoided; each pipeline can be inspected by using an endoscope, a small amount of paint residues are allowed to remain in areas with poor circulation such as corners of ball valves, other accessible pipeline areas cannot have paint residues, if the requirements cannot be met, all or part of the steps from S10 to S40 are repeated for re-cleaning, and a re-cleaning scheme can be judged according to the dirt degree, for example, only the step S40 is executed, the step S30-the step S40 are executed, or the step S10-the step S40 are executed, and the like.
In this embodiment, after the system to be cleaned is cleaned, the cleanliness of the system to be cleaned meets the requirement, a shrinkage cavity verification may be performed, the verification scheme is to take a diluent on the liquid level of the diluent in the tank and adjust paint with the diluent in the return line, no shrinkage cavity or depression occurs after the plate is sprayed, if the requirement cannot be met, all or part of the steps from step S10 to step S40 are repeated to perform re-cleaning, and the re-cleaning scheme may be determined according to the number and severity of the shrinkage cavities, for example, only step S40, step S30 to step S40, or step S10 to step S40 is performed.
In this embodiment, cleanliness detection is performed on the system to be cleaned, whether the system to be cleaned meets a preset cleaning condition is judged according to a cleanliness detection result, and if not, the steps of 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 are performed; if yes, performing shrinkage cavity verification on the system to be cleaned, and judging whether the system to be cleaned meets a preset shrinkage cavity condition or not according to a shrinkage cavity verification result; according to the invention, cleanliness detection is carried out on the system to be cleaned, whether the system to be cleaned meets a preset clean condition is judged according to a cleanliness detection result, so that accumulated paint in the system to be cleaned is cleaned up, then, the system to be cleaned is subjected to shrinkage cavity verification, and whether the system to be cleaned meets the preset shrinkage cavity condition is judged according to a shrinkage cavity verification result, so that the shrinkage cavity verification of the system to be cleaned is ensured to reach the standard, and the problem of pipeline blockage caused by the fact that the accumulated paint in the system to be cleaned is not detected is effectively avoided.
Claims (10)
1. A cleaning method of a solvent-based paint conveying system is characterized by comprising the following steps:
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.
2. The method for cleaning a solvent-based paint delivery system of claim 1, wherein said adding a diluent to said system to be cleaned and prior to cleaning said system to be cleaned, further comprises:
discharging the solvent type coating in the system to be cleaned;
when the solvent type coating in the system to be cleaned is exhausted, closing a pipe inlet valve of a circulating pump outlet filter of the system to be cleaned;
introducing compressed air through a discharge port of a circulating pump filter 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 by the compressed air.
3. The method for cleaning a solvent-based paint delivery system of claim 2, wherein said blowing of said system to be cleaned by said compressed air comprises:
grouping all pipelines in the system to be cleaned to obtain at least one group of pipeline groups;
and blowing air to each pipeline group through the compressed air respectively.
4. The method for cleaning a solvent-based paint delivery system according to any one of claims 1 to 3, wherein the adding of a diluent to the system to be cleaned and the cleaning of the system to be cleaned comprise:
determining a diluent corresponding to a solvent type coating according to coating information of the solvent type coating in a system to be cleaned;
when the solvent type coating in the system to be cleaned is completely blown, closing the valve of the 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 group of pipeline groups;
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 backpressure in each pipeline in the system to be cleaned is 3-5 bar.
5. The method for cleaning a solvent-based paint delivery system according to claim 4, wherein before the circulating cleaning of each pipeline in the system to be cleaned, the method further comprises:
disconnecting each pipeline in the system to be cleaned from the paint spraying unit corresponding to each pipeline;
and (4) short-connecting the paint supply pipeline in each pipeline with the paint return pipeline in each pipeline.
6. The method for cleaning a solvent-based paint delivery system according to any one of claims 1 to 3, wherein the steps of discharging the diluent from the system to be cleaned, adding an alkaline solvent to the system to be cleaned, and cleaning the system to be cleaned comprise:
discharging the diluent in the system to be cleaned by 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 to 13;
and circularly cleaning the system to be cleaned, wherein the back pressure in each pipeline of the system to be cleaned is 3-5 bar.
7. The method for cleaning a solvent-based paint delivery system according to any one of claims 1 to 3, wherein the steps of discharging the alkaline solvent from the system to be cleaned, adding a hydrophilic solvent to the system to be cleaned, and cleaning the system to be cleaned comprise:
discharging the alkaline solvent in the system to be cleaned by 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 3-5 bar.
8. The method for cleaning a solvent-based paint delivery system of claim 7, wherein said cyclically cleaning said system to be cleaned comprises:
detecting the connection state between each pipeline in the system to be cleaned and the paint spraying unit corresponding to each pipeline;
and when the connection state between each pipeline and the paint spraying unit corresponding to each pipeline is a disconnection state, connecting each pipeline with the paint spraying unit.
9. The method for cleaning a solvent-based paint delivery system according to any one of claims 1 to 3, wherein the steps of draining the hydrophilic solvent from the system to be cleaned, adding a diluent to the system to be cleaned, and cleaning the system to be cleaned comprise:
discharging the hydrophilic solvent in the system to be cleaned by 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 3-5 bar.
10. The method for cleaning a solvent-based paint delivery system according to any one of claims 1 to 3, wherein after the draining of the hydrophilic solvent from the system to be cleaned, the adding of a diluent to the system to be cleaned, and the cleaning of the system to be cleaned, the method further comprises:
carrying out cleanliness detection on the system to be cleaned, and judging whether the system to be cleaned meets preset cleanliness conditions or not according to a 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;
and if so, performing shrinkage cavity verification on the system to be cleaned, and judging whether the system to be cleaned meets a preset shrinkage cavity condition or not according to a shrinkage cavity verification result.
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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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