Using method for quickly cleaning filter of paint supply system

Abstract

The invention relates to the technical field of paint filtering of a paint rapid color changing system, and particularly discloses a use method for rapidly cleaning a paint supply system filter, which comprises the following use steps: S1, channel switching: when one paint supply channel needs to be cleaned, closing an inlet valve and an outlet valve on the paint supply channel, and closing the inlet valve and the outlet valve on the paint supply channel; meanwhile, an inlet valve and an outlet valve on the standby channel are opened, so that the standby channel is connected with the paint supply work, and the paint supply is not interrupted; and S2, reverse flushing is conducted, specifically, a cleaning medium is introduced into the cleaning channel of the paint supply channel to be cleaned through the cleaning channel, the cleaning medium reversely flushes the filter part, and waste generated by flushing passes through an inlet waste liquid valve and is discharged from an inlet waste liquid channel. The scheme is used for solving the problem that an existing filter cannot be applied to a roll-on color changing system needing continuous paint supply due to the fact that the cleaning process is long in time consumption and cleaning residues exist.

Description

Technical Field

[0001] This invention relates to the field of paint filtration technology for rapid paint color change systems, and specifically to a method for quickly cleaning the filter of a paint supply system. Background Technology

[0002] In automotive painting workshops, with the increasing market demand for personalized body color customization, hose-and-ball rapid color-changing paint supply systems are widely used due to their high-efficiency color-changing capabilities. However, to achieve the ultimate color-changing speed, the filter installed at the paint pump outlet is usually removed because traditional filter cleaning is too time-consuming and cannot match the fast color-changing cycle. Therefore, to ensure color-changing speed, existing high-speed hose-and-ball color-changing systems typically eliminate the filter at the paint pump outlet.

[0003] However, this leads to new problems: unfiltered paint is directly fed to the rotary cup of the painting robot or the manual spray gun. Impurities in the paint may wear down the precision rotary cup of the painting robot and cause paint quality defects such as particles and scratches on the car body, resulting in huge rework costs.

[0004] In existing technologies, such as the "Single-Channel Automatic Backwashing Filter System" with patent publication number CN111318072A, the system uses compressed air and solvent to backwash the filter element when backwashing is required. The waste liquid generated during backwashing is discharged after passing through a second color-changing valve. Although this method is faster than the traditional method of disassembling the filter screen for cleaning, the backwashing process (including subsequent pipe settling, solvent evaporation, or residue) still takes up a relatively long process time, which cannot meet the second-level color-changing cycle requirements of the ball-bead color-changing system. This is the fundamental reason why, in high-cycle ball-bead color-changing systems, speed is prioritized even at the expense of filtration.

[0005] Furthermore, in the aforementioned backwashing filtration system, because solvents are used in the rinsing process, residues inevitably remain in the pipes and filter elements after cleaning. Under this structure, the residues will enter the subsequent painting pipeline with the continuous supply of paint, thereby affecting the subsequent painting quality.

[0006] Therefore, there is an urgent need in this field for a filter and its usage method that can effectively filter paint, achieve rapid and thorough cleaning, and not affect the continuous operation of the ball bearing color-changing system. Summary of the Invention

[0007] The present invention aims to provide a method for quickly cleaning the filter of a paint supply system, in order to solve the problem that existing filters cannot be used in ball bearing color-changing systems that require continuous paint supply because the cleaning process is time-consuming and leaves cleaning residues.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A method for using a rapid-cleaning paint supply system filter, the rapid-cleaning paint supply system filter comprising at least two parallel paint supply channels, each paint supply channel being sequentially equipped with an inlet valve, a filter element, and an outlet valve; each paint supply channel is also connected to a cleaning channel and an inlet waste liquid channel, the cleaning channel being equipped with a valve, and the output end of the cleaning channel being connected to the paint supply channel between the filter element and the outlet valve; the inlet waste liquid channel being connected to the paint supply channel between the filter element and the inlet valve, and the inlet waste liquid channel being equipped with an inlet waste liquid valve; at least one of the paint supply channels is used as a backup channel; It also includes the following usage steps: S1. Channel switching: When a paint supply channel needs to be cleaned, close the inlet valve and outlet valve on the paint supply channel, and at the same time open the inlet valve and outlet valve on the standby channel, so that the standby channel takes over the paint supply work and ensures that the paint supply is not interrupted. S2, Backwash: The cleaning medium is introduced into the cleaning channel of the paint supply channel to be cleaned through the cleaning channel. The cleaning medium backwashes the filter element, and the waste generated by the backwash is discharged from the inlet waste liquid channel through the inlet waste liquid valve.

[0009] The principle of this solution is as follows: When in use, this solution uses parallel paint supply channels and sets up a backup channel so that when any channel needs filter cleaning or maintenance, it can immediately switch to the backup channel to continue supplying paint, thereby achieving continuity of paint supply operations.

[0010] Preferably, as an improvement, each paint supply channel is also connected to an outlet waste liquid channel, and an outlet waste liquid valve is installed on the outlet waste liquid channel; the output end of the outlet waste liquid channel is connected to the paint supply channel between the filter element and the outlet valve. It also includes S3, residue removal treatment: Before the formal paint supply, the outlet valve of the paint supply channel that has completed backflushing and the valve on the cleaning channel connected to it are closed, and paint is introduced into the paint supply channel so that the paint fills the paint supply channel, the inlet waste liquid channel and the outlet waste liquid channel, and the cleaning residue remaining in the paint supply channel is squeezed out from the outlet waste liquid channel and the inlet waste liquid channel.

[0011] Beneficial effects: By adding an outlet waste liquid channel and coordinating it with the inlet waste liquid channel, this solution can effectively remove residual cleaning media by using new paint to replace and drain the paint supply channel in sections before the paint is supplied, thus avoiding contamination of subsequent spraying.

[0012] Preferably, as an improvement, the connection between the outlet waste liquid channel and the paint supply channel is located downstream of the connection between the cleaning channel and the paint supply channel, and close to the outlet valve of the paint supply channel, so that in the subsequent cleaning steps, when the cleaning medium flows through the paint supply channel, it can more directly rush towards the blind end area in the direction of the outlet valve, which helps to improve the cleanliness of this area.

[0013] Preferably, as an improvement, after the backwashing in step S2 is completed, the process also includes rinsing the outlet waste liquid channel. During this rinsing, only the valve on the cleaning channel connected to the paint supply channel being cleaned and the outlet waste liquid valve on the outlet waste liquid pipeline are opened.

[0014] Beneficial effects: This step specifically flushes the outlet waste liquid channel itself, preventing impurities that entered the channel during the previous backflushing from accumulating here, ensuring its unobstructed and cleanliness, and also making the end of the outlet valve facing the filter element clearer and cleaner during flushing.

[0015] Preferably, as an improvement, all paint supply channels are connected to the same cleaning channel, and the output end of the cleaning channel is connected to at least two branch channels, the output end of each branch channel being connected to a paint supply channel. When there are two branch channels, a three-way switching valve is installed between the input end of the two branch channels and the cleaning channel, or a switch valve is installed on each branch channel. When there are more than two branch channels, install a switch valve on each branch channel.

[0016] Beneficial effects: By sharing the main cleaning channel and combining it with branch pipeline design, the filter structure can be simplified and costs reduced; by configuring corresponding valve control methods for different numbers of branches, independent control of the cleaning path of each paint supply channel can be achieved flexibly and reliably.

[0017] Preferably, as an improvement, the input end of the cleaning channel is connected to an air channel and a solvent channel in parallel; the air channel and the solvent channel are each provided with an independent switching valve to control their on / off state. The switching valve is the valve provided on the cleaning channel, or the valve on the cleaning channel is a switching valve installed at the input end of the cleaning channel. The switching valve is connected to the air channel and the solvent channel, and the switching valve is used to selectively switch the input path of the cleaning channel between the air channel and the solvent channel.

[0018] Beneficial effects: This solution provides two specific valve configuration schemes for switching cleaning media, enabling the filter to switch on and off the solvent and compressed air as needed.

[0019] Preferably, as an improvement, both the air channel and the solvent channel are equipped with one-way valves.

[0020] Beneficial effects: The one-way valve in this solution can prevent the cleaning medium from flowing in the opposite direction or interfering with each other when the pressure fluctuates, ensuring the singleness and stability of the medium flow direction.

[0021] Preferably, as an improvement, during each rinsing, an alternating cycle of solvent cleaning and compressed air cleaning is first used, and after the alternating cycle is completed, only compressed air is used for purging.

[0022] Beneficial effects: The alternating circulation of solvent and compressed air in this solution can improve the cleaning effect by utilizing the physicochemical properties of different media; finally, purging with compressed air helps to remove residual liquid solvent in the pipeline and reduce solvent residue.

[0023] Preferably, as an improvement, the paint supply channel is equipped with pressure sensors on both the input and output sides of the filter element to assess the clogging status of the filter element in real time, providing a basis for determining whether cleaning needs to be initiated.

[0024] Preferably, as an improvement, the pressure sensor is connected to the control system. The control system calculates the pressure difference between the input and output sides of the filter element, and when the pressure difference exceeds the set range, steps S1-S2 are initiated to realize the automatic judgment of the filter element cleaning needs and the automatic triggering of the cleaning process, thereby reducing manual intervention and improving the degree of automation and response speed. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the rapid cleaning filter of the paint supply system according to Embodiment 1 of the present invention.

[0026] Figure 2 This is a schematic diagram of another embodiment of the rapid cleaning paint supply system filter of Embodiment 1 of the invention.

[0027] Figure 3 This is a schematic diagram showing the installation of independent valves on a branch channel of the cleaning channel of the rapid cleaning paint supply system filter in Embodiment 1 of the invention.

[0028] The reference numerals in the accompanying drawings include: paint supply channel 10, inlet valve 11, filter element 12, outlet valve 13, sensor P1, sensor P2, cleaning channel 20, air channel 21, solvent channel 22, switch valve 23, one-way valve 24, switching valve 25, branch channel 26, three-way switching valve 27, inlet waste liquid channel 30, inlet waste liquid valve 31, outlet waste liquid channel 40, and outlet waste liquid valve 41. Detailed Implementation

[0029] The following detailed description illustrates the specific implementation method: Example 1 Combination Figure 1A method for using a quick-cleaning paint supply system filter requires the use of a quick-cleaning paint supply system filter, which is installed between the outlet of the paint supply pump and the inlet of the hose ball-type color changing system (in this embodiment, the hose ball-type color changing system is the quick-cleaning paint supply system). The quick-cleaning paint supply system filter includes at least two parallel paint supply channels 10, and in this embodiment, the number of paint supply channels 10 is taken as two.

[0030] Each paint supply channel 10 is equipped with an inlet valve 11, an inlet pressure sensor, a filter element 12, an outlet pressure sensor, and an outlet valve 13 in sequence according to the paint supply flow direction. In the attached drawings, the inlet pressure sensor and the outlet pressure sensor on one paint supply channel 10 are represented by P1 and P2, respectively, and the inlet pressure sensor and the outlet pressure sensor on the other paint supply channel 10 are represented by P3 and P4, respectively.

[0031] Two paint supply channels 10 share a cleaning channel 20. The cleaning channel 20 is equipped with a valve. The input end of the cleaning channel 20 is connected to a parallel air channel 21 and a solvent channel 22. Both the air channel 21 and the solvent channel 22 are equipped with a one-way valve 24.

[0032] In one embodiment, combined Figure 1 Independent switching valves 23 are provided on the air channel 21 and the solvent channel 22 respectively to control the on / off of the corresponding medium. The switching valves 23 are the valves provided on the cleaning channel 20.

[0033] In another embodiment, combined with Figure 2 Instead of the independent switch valves 23 installed on the air channel 21 and solvent channel 22, the valve on the cleaning channel 20 is replaced by a switching valve 25 installed at the input end of the cleaning channel 20. The switching valve 25 connects the air channel 21 and the solvent channel 22. The switching valve 25 is used to selectively switch the input path of the cleaning channel 20 between the air channel 21 and the solvent channel 22. The initial switching valve 25 is a three-way switching valve.

[0034] Two branch channels 26 are connected to the output end of the cleaning channel 20. The output end of each branch channel 26 is connected to a paint supply channel 10. A three-way switching valve 27 is installed between the input end of the two branch channels 26 and the cleaning channel 20 (e.g., Figure 2 (as shown), or install switch valves on each branch channel 26 (such as...). Figure 3 (As shown).

[0035] Each paint supply channel 10 is also connected to an inlet waste liquid channel 30 and an outlet waste liquid channel 40. The cleaning channel 20 and the outlet waste liquid channel 40 are connected to the paint supply channel 10 between the output side of the filter element 12 and the outlet valve 13. The connection between the outlet waste liquid channel 40 and the paint supply channel 10 is located downstream of the connection between the cleaning channel 20 and the paint supply channel 10, and close to the outlet valve 13 of the paint supply channel 10. The inlet waste liquid channel 30 is connected to the inlet valve 11 and the paint supply channel 10 on the input side of the filter element 12.

[0036] An inlet waste liquid valve 31 is installed on the inlet waste liquid channel 30, and an outlet waste liquid valve 41 is installed on the outlet waste liquid channel 40. Both the outlet waste liquid valve 41 and the inlet waste liquid valve 31 are on / off valves. Waste solvent tanks are provided at the ends of the inlet waste liquid channel 30 and the outlet waste liquid channel 40 away from the paint supply channel 10 to facilitate the collection of waste.

[0037] All pressure sensors are connected to the control system, which calculates the pressure difference between the input and output sides of each filter element 12 and controls the filter to flush the corresponding paint supply channel 10 when the pressure difference exceeds the set range.

[0038] All channels, valves, and sensors on the quick-cleaning paint supply system filter can be integrated into a stainless steel valve block to form a complete filter system.

[0039] This embodiment also provides a method for quickly cleaning a paint supply system filter, including the following steps: S0, two paint supply channels 10, one of which is used as the working channel, and the other is used as the backup channel.

[0040] S1. Channel switching: When the control system detects that the pressure difference on both sides of the corresponding filter element 12 in a paint supply channel 10 exceeds the set range, the control filter executes steps S1-S2-S3 in sequence. In step S2, the inlet valve 11 and outlet valve 13 on the paint supply channel 10 are closed first, and then the inlet valve 11 and outlet valve 13 on the backup channel are opened at the same time, so that the backup channel takes over the paint supply work to ensure that the paint supply is not interrupted. S2, Backwash: After the inlet waste liquid valve 31 on the connecting pipeline of the paint supply channel 10 to be cleaned is opened to release pressure, the valve on the cleaning channel 20 is activated, causing the cleaning solvent from the solvent channel 22 and the air channel 21 to alternately enter the paint supply channel 10 to be cleaned, so as to... Figure 1 For example: At this time, the solvent / air passes through the one-way valve 24, and then sequentially through the corresponding switch valve 23, three-way switching valve 27, outlet pressure sensor, filter element 12, inlet pressure sensor, and inlet waste liquid valve 31, and finally flows into the waste solvent tank along the inlet waste liquid channel 30; when the cleaning solvent and compressed air are alternately supplied to the set time, the initial reverse flushing is completed.

[0041] After the initial backwash is completed, the outlet waste liquid channel 40 can be flushed. During this flushing, only the valve on the cleaning channel 20 connected to the paint supply channel 10 being cleaned and the outlet waste liquid valve 41 on the outlet waste liquid pipeline are opened. During the cleaning, the cleaning solvent and compressed air are supplied alternately for flushing. After the cleaning reaches the set time, only the valve on the air channel 21 and the inlet waste liquid valve 31 connected to the corresponding paint supply channel 10 are opened. At this time, the compressed air blows the inside of the filter to clean the solvent in the paint supply channel 10 to the greatest extent.

[0042] S3. Residual Removal: Before the formal paint supply, there may still be cleaning solvent or other residues in the paint supply channel 10. After completing step S2, the outlet valve 13 of the paint supply channel 10 and the valve on the cleaning channel 20 connected to it are closed. Paint is then introduced into the paint supply channel 10. The paint first passes through the inlet valve 11 and the inlet waste liquid valve 31 in sequence to remove any solvent that may be present in this section of the pipeline. Then, the paint passes through the inlet valve 11, the inlet pressure sensor, the filter element 12, the outlet pressure sensor, and the outlet waste liquid valve 41 in sequence to remove any solvent that may be present in this section. At this point, there is no residual solvent in the corresponding filter element 12 and the paint supply channel 10, and the cleaning process is completed.

[0043] During normal paint supply, paint is delivered from the paint supply pump to the inlet of the corresponding working paint supply channel 10. The inlet valve 11 and outlet valve 13 of the paint supply channel 10, which serves as the working channel, are open, while the other valves connected to it are closed. The paint passes through the inlet valve 11, inlet pressure sensor, filter element 12, outlet pressure sensor, and outlet valve 13 in sequence, and is finally delivered from the outlet of the paint supply channel 10 to downstream painting equipment (such as the painting equipment of the hose ball-type color changing system).

[0044] This embodiment not only enables a filter structure that allows for non-stop switching and cleaning by setting up parallel paint supply channels 10 and other connected channels and corresponding valves on the channels, but also specifies a complete automated usage method that includes channel switching, backwashing, and residue removal. It realizes automatic monitoring of filter blockage and automatic initiation of the cleaning program. Furthermore, through the control of the cleaning logic, it ensures the continuity of subsequent painting processes under the high-speed requirements of rapid color change, while thoroughly removing cleaning residues to avoid contamination and ensuring the quality of paint spraying.

[0045] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for quickly cleaning a filter in a paint supply system, characterized in that: The rapid cleaning paint supply system filter includes at least two parallel paint supply channels, each of which is sequentially equipped with an inlet valve, a filter element, and an outlet valve. Each paint supply channel is also connected to a cleaning channel and an inlet waste liquid channel. The cleaning channel is equipped with a valve, and its output end is connected to the paint supply channel between the filter element and the outlet valve. The inlet waste liquid channel is connected to the paint supply channel between the filter element and the inlet valve, and is equipped with an inlet waste liquid valve. At least one of the paint supply channels is used as a backup channel. It also includes the following usage steps: S1. Channel switching: When a paint supply channel needs to be cleaned, close the inlet valve and outlet valve on the paint supply channel, and at the same time open the inlet valve and outlet valve on the standby channel, so that the standby channel takes over the paint supply work and ensures that the paint supply is not interrupted. S2, Backwash: The cleaning medium is introduced into the cleaning channel of the paint supply channel to be cleaned through the cleaning channel. The cleaning medium backwashes the filter element, and the waste generated by the backwash is discharged from the inlet waste liquid channel through the inlet waste liquid valve.

2. The method of using the rapid cleaning filter of the paint supply system according to claim 1, characterized in that: Each paint supply channel is also connected to an outlet waste liquid channel, on which an outlet waste liquid valve is installed; the output end of the outlet waste liquid channel is connected to the paint supply channel between the filter element and the outlet valve. It also includes S3, residue removal treatment: Before the formal paint supply, the outlet valve of the paint supply channel that has completed backflushing and the valve on the cleaning channel connected to it are closed, and paint is introduced into the paint supply channel so that the paint fills the paint supply channel, the inlet waste liquid channel and the outlet waste liquid channel, and the cleaning residue remaining in the paint supply channel is squeezed out from the outlet waste liquid channel and the inlet waste liquid channel.

3. The method of using the rapid cleaning filter of the paint supply system according to claim 2, characterized in that: The connection between the outlet waste liquid channel and the paint supply channel is located downstream of the connection between the cleaning channel and the paint supply channel, and close to the outlet valve of the paint supply channel.

4. The method of using the rapid cleaning filter of the paint supply system according to claim 3, characterized in that: After the backwashing in step S2 is completed, the process also includes rinsing the outlet waste liquid channel. During this rinsing, only the valve on the cleaning channel connected to the paint supply channel being cleaned and the outlet waste liquid valve on the outlet waste liquid pipeline are opened.

5. The method of using the rapid cleaning filter of the paint supply system according to claim 1, characterized in that: All paint supply channels are connected to the same cleaning channel. The output of the cleaning channel is connected to at least two branch channels, and the output of each branch channel is connected to a paint supply channel. When there are two branch channels, a three-way switching valve is installed between the input end of the two branch channels and the cleaning channel, or a switch valve is installed on each branch channel. When there are more than two branch channels, install a switch valve on each branch channel.

6. The method of using the rapid cleaning filter of the paint supply system according to claim 1, characterized in that: The input end of the cleaning channel is connected to an air channel and a solvent channel in parallel. Each air channel and solvent channel is equipped with an independent switching valve to control its on / off state. The switching valve is either a valve installed on the cleaning channel or a switching valve installed at the input end of the cleaning channel. The switching valve is connected to the air channel and the solvent channel and is used to selectively switch the input path of the cleaning channel between the air channel and the solvent channel.

7. The method of using the rapid cleaning filter of the paint supply system according to claim 6, characterized in that: Both the air channel and the solvent channel are equipped with one-way valves.

8. The method of using the rapid cleaning filter of the paint supply system according to claim 1, characterized in that: During each rinse, an alternating cycle of solvent cleaning and compressed air cleaning is first used. After the alternating cycle is completed, only compressed air is used for purging.

9. The method of using the rapid cleaning filter of the paint supply system according to any one of claims 1-8, characterized in that: Pressure sensors are installed on both the input and output sides of the filter element in the paint supply channel.

10. The method of using the rapid cleaning filter of the paint supply system according to claim 9, characterized in that: The pressure sensor is connected to the control system. The control system calculates the pressure difference between the input and output sides of the filter element, and initiates steps S1-S2 when the pressure difference exceeds the set range.

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