CN112354750A - Double-main-pipe circulating paint conveying and mixing system for automobile coating and control method thereof - Google Patents
Double-main-pipe circulating paint conveying and mixing system for automobile coating and control method thereof Download PDFInfo
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- CN112354750A CN112354750A CN202011196201.5A CN202011196201A CN112354750A CN 112354750 A CN112354750 A CN 112354750A CN 202011196201 A CN202011196201 A CN 202011196201A CN 112354750 A CN112354750 A CN 112354750A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
- B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
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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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Abstract
The invention relates to a double-main-pipe circulating paint conveying and mixing system for automobile coating and a control method thereof, wherein the system comprises a plurality of spraying stations, a paint supply module and a control unit, wherein the paint supply module comprises a circulating tank and a circulating pump; the paint supply module also comprises a first main pipeline, a second main pipeline, a pipeline regulating and controlling assembly and a branch pipeline; the first main pipeline and the second main pipeline are equal-diameter pipelines capable of being communicated with beads; the upstream interfaces of the first main pipeline and the second main pipeline are respectively communicated with the outlet end of the circulating pump, and the downstream interfaces are respectively communicated with the material return end of the circulating tank; the branch pipeline is provided with a delivery end for delivering paint to the spraying station, and the supply end of the branch pipeline is communicated with the first main pipeline and the return end is communicated with the second main pipeline. The invention also discloses a corresponding control method. The double-main-pipe circulating paint conveying and mixing system can circulate the paint in the branch pipeline and recycle the paint by adopting the moving balls, so that the utilization rate of the paint can be improved and the discharge amount of waste liquid can be reduced.
Description
Technical Field
The invention relates to the technical field of automobile coating paint conveying and mixing, in particular to a double-main-pipe circulating paint conveying and mixing system for automobile coating and a control method thereof.
Background
Automobile painting is one of four major processes in automobile production. Automotive paints are readily precipitable mixtures that require constant circulation within the pipe to prevent the paint from precipitating and affecting the quality of the spray. The automobile coating is generally finished by adopting a centralized paint conveying and mixing system (a paint conveying and mixing system for short), wherein the conventional paint conveying and mixing system mainly comprises a plurality of spraying stations (operation stations), paint supply modules for supplying paint to the spraying stations and a control unit for controlling the working state of the paint supply modules; the paint supply module comprises a circulating tank for storing paint, a circulating pump communicated with the discharge end of the circulating tank, and a main pipeline and a branch pipeline communicated with the circulating pump. When the paint spraying device works, the paint is output from the circulating tank by the circulating pump and is conveyed to each spraying station through the main pipeline and the branch pipelines.
The paint conveying and mixing system is very important for ensuring the spraying quality of an automobile and reducing the emission of waste liquid (VOC), and the existing paint conveying and mixing systems are mainly divided into the following three types according to different circulating modes of paint in pipelines:
1. a main pipe circulation system which delivers paint through a main pipe to the vicinity of the painting stations and circulates back to the circulation tank, each painting station taking paint from the main pipe through a branch pipe. The main circulating system of the main pipe has the main advantages that: 1) the main pipeline without reducing diameter can reduce the shearing damage to the paint, and the paint filled in the primary feeding is least; 2) the circulating pressure of the main pipeline is controlled by the pressure value of the outlet of the circulating pump and the backpressure valve, and the pressure of each branch pipeline is controlled by a pressure regulator, so that the operation is simple and easy; 3) the main pipeline can realize paint recovery and pipeline cleaning through walking the pearl, has higher paint recovery rate when system cleaning or trade the look.
2. The two-wire circulating system comprises a paint supply pipe which is thinned from thick, a return pipe which is thinned from thin to thick, a circulating branch pipe from the paint supply pipe to the return pipe and a plurality of branch pipes passing through the spray gun. The two-wire circulation system has the main advantages that: 1) a branch pipe pressure regulator is not needed, so that the shearing action of the branch pipe pressure regulator on the paint is avoided; 2) the requirements on pressure and flow are low, and the energy consumption of operation is low.
3. The three-line circulating system comprises a main circulating pipe with no diameter change, a return pipe with gradually increasing inner diameter and a plurality of branch pipes (with pressure regulators) passing through the spray gun. The main advantage of the three-wire circulation system is that the expandability is strong, namely, the paint spraying points can be added in the used system.
However, the applicant found in practical research that the following problems exist in the three conventional paint delivery and mixing systems: 1) the branch pipeline of the main pipe circulating system is a blind end, so that paint in the branch pipeline is easy to precipitate in a non-working state, the spraying quality of the paint can be ensured only by completely discharging the paint in the branch pipeline before starting, and the paint has low utilization rate and large waste liquid discharge amount. 2) The main pipeline of the two-line circulating system can not use the moving ball, so that the paint recovery rate is very low and the discharge amount of waste liquid is large when the pipeline is cleaned. 3) A pressure regulator is required to be arranged on each branch pipeline of the three-line circulation system, so that the shearing of paint is large and the hardware investment is high; meanwhile, as one main pipeline is a reducer pipe, the paint can not be recovered by using the moving balls, and the problems of low paint recovery rate and large waste liquid discharge amount exist.
Therefore, the applicant thinks of designing a paint transporting and mixing system capable of circulating paint in branch pipelines and recycling the paint by adopting beads so as to improve the paint utilization rate and reduce the discharge amount of waste liquid.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide the defeated accent lacquer system that paint vehicle just can adopt the pearl of walking to retrieve the paint vehicle in can circulation branch pipeline to promote paint vehicle rate of utilization, reduce the waste liquid discharge, thereby supplementary spraying effect that promotes the automobile painting.
In order to solve the technical problems, the invention adopts the following technical scheme:
the double-main-pipe circulating paint conveying and mixing system for automobile coating comprises a plurality of spraying stations, paint supply modules for supplying paint to the spraying stations, and a control unit for controlling the paint supply modules; the paint supply module comprises a circulating tank for storing paint, and a circulating pump with an inlet end communicated with a discharge end of the circulating tank; the paint supply module also comprises a first main pipeline and a second main pipeline which are respectively communicated with the outlet end of the circulating pump, a pipeline regulating and controlling component for regulating and controlling the on-off state of the pipelines of the first main pipeline and the second main pipeline, and a branch pipeline for conveying paint to the corresponding spraying station;
the first main pipeline and the second main pipeline are equal-diameter pipelines capable of being communicated with beads;
the upstream interfaces of the first main pipeline and the second main pipeline are respectively communicated with the outlet end of the circulating pump, and the downstream interfaces are respectively communicated with the material return end of the circulating tank; the branch pipeline is provided with a delivery end for delivering paint to the spraying station, and the supply end of the branch pipeline is communicated with the first main pipeline and the return end is communicated with the second main pipeline.
Preferably, the pipeline regulation and control assembly comprises a first upstream valve arranged between an upstream interface of the first main pipeline and the outlet end of the circulating pump in a communicating manner, a first downstream valve arranged between a downstream interface of the first main pipeline and the return end of the circulating tank in a communicating manner, a second upstream valve arranged between an upstream interface of the second main pipeline and the outlet end of the circulating pump in a communicating manner, and a second downstream valve arranged between a downstream interface of the second main pipeline and the return end of the circulating tank in a communicating manner.
Preferably, the inlet end of the first downstream valve is communicated with the downstream interface of the first main pipeline, and a first back pressure generation assembly is arranged between the outlet end of the first downstream valve and the return end of the circulation tank in a communication manner; the inlet end of the second downstream valve is communicated with a downstream interface of the second main pipeline, and a second back pressure generation assembly is arranged between the outlet end of the second downstream valve and the return end of the circulating tank in a communicated mode.
Preferably, the first back pressure generating assembly comprises: the first backpressure valve is communicated with the outlet end of the first downstream valve and the feed back end of the circulating tank respectively, the first air source is used for supplying air to the first backpressure valve, and the first air pipe is used for communicating the first air source and the backpressure adjusting end of the first backpressure valve; the first air pipe is communicated with a first electromagnetic valve and a first pneumatic pressure reducing valve which are mutually connected in series, and a first auxiliary electromagnetic valve and a first auxiliary pneumatic pressure reducing valve which are mutually connected in series and are parallel to the first electromagnetic valve and the first pneumatic pressure reducing valve; the first back pressure valve, the first electromagnetic valve, the first pneumatic pressure reducing valve, the first auxiliary electromagnetic valve and the first auxiliary pneumatic pressure reducing valve are all controlled by the control unit.
Preferably, the second back pressure generating assembly comprises: the second backpressure valve is communicated with the inlet end of the second downstream valve and the feed back end of the circulating tank respectively, the second air source is used for supplying air to the second backpressure valve, and the second air pipe is used for communicating the second air source and the backpressure regulating end of the second backpressure valve; the second air pipe is communicated with a second electromagnetic valve and a second pneumatic pressure reducing valve which are mutually connected in series, and a second auxiliary electromagnetic valve and a second auxiliary pneumatic pressure reducing valve which are mutually connected in series and are parallel to the second electromagnetic valve and the second pneumatic pressure reducing valve; the second back pressure valve, the second electromagnetic valve, the second pneumatic reducing valve, the second auxiliary electromagnetic valve and the second auxiliary pneumatic reducing valve are all controlled by the control unit.
Preferably, the first upstream valve and the second upstream valve are converging three-way ball valves capable of passing through beads, and the first downstream valve and the second downstream valve are diverging three-way ball valves capable of passing through beads;
the outlet end of the first upstream valve is communicated with an upstream interface of the first main pipeline, and one inlet end of the first upstream valve is communicated with the outlet end of the circulating pump; the outlet end of the second upstream valve is communicated with an upstream interface of the second main pipeline, and one inlet end of the second upstream valve is communicated with the outlet end of the circulating pump; the inlet end of the first downstream valve is communicated with a downstream interface of the first main pipeline, and one outlet end of the first downstream valve is communicated with the first backpressure valve; the inlet end of the second downstream valve is communicated with a downstream interface of the second main pipeline, and one outlet end of the second downstream valve is communicated with the second backpressure valve;
the paint supply module further comprises a ball moving assembly, wherein the ball moving assembly comprises a first ball moving emitting device communicated with the other inlet end of the first upstream valve, a first ball moving receiving device communicated with the other outlet end of the first downstream valve, a second ball moving emitting device communicated with the other inlet end of the second upstream valve and a second ball moving receiving device communicated with the other outlet end of the second downstream valve; the first ball moving device is arranged between the first ball moving emitting device and the first ball moving receiving device, and the second ball moving device is arranged between the second ball moving emitting device and the second ball moving receiving device.
The invention also discloses a circulation control method implemented based on the double-main-pipe circulation paint conveying and mixing system, wherein the control system enters a working circulation mode when a spraying station works, and the method specifically comprises the following steps:
s1: controlling the first auxiliary electromagnetic valve to be opened, and controlling the pressure value of the outlet of the first auxiliary pressure reducing valve to be regulated to the minimum value, so that the back pressure value of the first back pressure valve is zero;
s2: controlling the second electromagnetic valve to be opened, and controlling the pressure value of the outlet of the second pressure reducing valve to be adjusted to the maximum value, so that the back pressure value of the second back pressure valve is the maximum value;
s3: gradually controlling and increasing the pressure value of the outlet of the first auxiliary pressure reducing valve, and gradually controlling and adjusting the pressure value of the outlet end of the circulating pump to a design pressure value, so that the paint at the outlet end of the circulating pump flows into the first main pipeline; when the flow of the outlet end of the circulating pump reaches the designed circulating flow of the first main pipeline, acquiring a backpressure value P1H of the first backpressure valve;
s4: gradually controlling and reducing the pressure value of the outlet of the second pressure reducing valve to enable the paint at the outlet end of the circulating pump to be shunted to the second main pipeline; when the flow of the outlet end of the circulating pump reaches the sum of the design circulating flow of the first main pipeline and the design circulating flow of the second main pipeline, acquiring a back pressure value P2H of the second back pressure valve;
s5: the backpressure values of the first backpressure valve and the second backpressure valve are controlled and adjusted to P1H and P2H respectively, so that the system is in a work circulation mode.
Preferably, when the time for stopping the spraying station exceeds a set value, the control system enters a full-circulation mode, and the method specifically comprises the following steps:
controlling the back pressure value of the first back pressure valve to be the middle back pressure value P1M, and controlling the back pressure value of the second back pressure valve to be the low back pressure value P2L; the pressure value of the medium back pressure value P1M is 3-6 bar, and the pressure value of the low back pressure value P2L is 0-3 bar.
Preferably, the control system enters the energy-saving circulation mode when the spraying station stops working and the full circulation time exceeds a set value, and the method specifically comprises the following steps:
controlling the back pressure value of the first back pressure valve to a low back pressure value P1L, and controlling the back pressure value of the second back pressure valve to a low back pressure value P2L; the pressure value of the low back pressure value P1L is 0-3 bar.
The invention also discloses a paint recovery control method implemented based on the double-main-pipe circulating paint conveying and mixing system, which comprises the following steps when paint in the first main pipeline and the second main pipeline is recovered:
a1: controlling the circulating pump to stop working, and controlling the first backpressure valve and the second backpressure valve to be fully opened until backpressure values in the first main pipeline and the second main pipeline are zero;
a2: correspondingly arranging the first moving ball and the second moving ball in the first moving ball launching device and the second moving ball launching device;
a3: controlling and adjusting the first upstream valve and the second upstream valve to enable the first ball-moving emission device and the second ball-moving emission device to be communicated with upstream interfaces of the first main pipeline and the second main pipeline respectively; controlling and adjusting the first downstream valve and the second downstream valve to enable the first ball-moving receiving device and the second ball-moving receiving device to be communicated with downstream interfaces of the first main pipeline and the second main pipeline respectively;
a4: and supplying gas to the first bead running and launching device and the second bead running and launching device, and starting the first bead running and the second bead running to enable the first bead running and the second bead running to respectively move towards the first bead running and receiving device and the second bead running and receiving device correspondingly, so that paint in the first main pipe and the second main pipe is correspondingly recovered into the first bead running and receiving device and the second bead running and receiving device.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the paint can be controlled to circularly flow among the first main pipeline, the branch pipeline and the second main pipeline, namely 'branch pipeline paint circulation' can be realized, so that the paint does not precipitate in the branch pipeline in a non-working state, and the paint in the branch pipeline does not need to be emptied before work, thereby well improving the utilization rate of the paint.
2. According to the invention, the two main pipelines are equal-diameter pipelines capable of being communicated with the beads, so that the beads can be adopted to recover paint and clean the main pipelines (namely can be matched with the beads), and the utilization rate of the paint can be effectively improved and the discharge amount of waste liquid can be reduced by the way of recovering the paint and cleaning the main pipelines by the beads.
3. According to the invention, the double-main-pipeline structure can adapt to high-viscosity paint, and can control the first main pipeline and the second main pipeline to simultaneously convey the paint to the spraying station when the spraying station has a demand for instantaneous large flow, so that the spraying effect of automobile coating can be improved in an auxiliary manner.
Drawings
For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a paint feeding and mixing system according to a first embodiment;
FIG. 2 is a schematic structural diagram of a first backpressure generating assembly in accordance with one embodiment;
FIG. 3 is a schematic structural diagram of a second backpressure generating assembly in accordance with one embodiment;
FIG. 4 is a logic block diagram of the control entering the duty cycle mode in the second embodiment;
FIG. 5 is a schematic structural diagram of a paint transporting and mixing system in the third embodiment;
FIG. 6 is a logic block diagram of the control ball-laying assembly for paint recycling in the fourth embodiment.
Reference numerals in the drawings of the specification include: the system comprises a paint supply module 1, a circulating pump 11, a circulating tank 12, a first main pipeline 2, a first upstream valve 21, a first downstream valve 22, a first back pressure generating assembly 23, a first back pressure valve 201, a first electromagnetic valve 202, a first pneumatic pressure reducing valve 203, a first auxiliary electromagnetic valve 204, a first auxiliary pneumatic pressure reducing valve 205, a first air source 206, a second main pipeline 3, a second upstream valve 31, a second downstream valve 32, a second back pressure generating assembly 33, a second back pressure valve 301, a second electromagnetic valve 302, a second pneumatic pressure reducing valve 303, a second auxiliary electromagnetic valve 304, a second auxiliary pneumatic pressure reducing valve 305, a second air source 306, a pipeline branch 4, a spraying station 5, a first bead-moving transmitting device 61, a first bead-moving receiving device 62, a second bead-moving transmitting device 71 and a second bead-moving receiving device 72.
Detailed Description
The following is further detailed by the specific embodiments:
the first embodiment is as follows:
as shown in fig. 1: the embodiment discloses a double-main-pipe circulating paint conveying and mixing system for automobile coating, which comprises a plurality of spraying stations 5, a paint supply module 1 for supplying paint to each spraying station 5, and a control unit for controlling the paint supply module 1; the paint supply module 1 comprises a circulating tank 12 for storing paint, and a circulating pump 11 with the inlet end communicated with the discharge end of the circulating tank 12; the paint supply module 1 further comprises a first main pipeline 2 and a second main pipeline 3 which are respectively communicated with the outlet end of the circulating pump 11, a pipeline regulating and controlling component for regulating and controlling the on-off state of the pipelines of the first main pipeline 2 and the second main pipeline 3, and a branch pipeline 4 for conveying paint to the corresponding spraying station 5;
the first main pipeline 2 and the second main pipeline 3 are equal-diameter pipelines capable of being communicated with beads;
the upstream interfaces of the first main pipeline 2 and the second main pipeline 3 are respectively communicated with the outlet end of the circulating pump 11, and the downstream interfaces are respectively communicated with the material return end of the circulating tank 12; the branch pipe 4 has a delivery end for delivering paint to the painting station 5, and the branch pipe 4 has a supply end communicated with the first main pipe 2 and a return end communicated with the second main pipe 3.
In the actual coating process, the first main pipeline 2 and the second main pipeline 3 are conducted by controlling the pipeline regulating and controlling assembly (the pipeline regulating and controlling assembly can be controlled manually or by a control unit, in the embodiment, the pipeline regulating and controlling assembly is controlled by the control unit), then the circulating pump 11 is controlled to start outputting paint in the circulating tank 12, the outputted paint flows through the first main pipeline 2 and the second main pipeline 3 and then flows back to the circulating tank 12, and a 'main pipeline paint circulation' is formed; meanwhile, paint in the first main pipeline 2 can enter the branch pipeline 4 during circulation, the branch pipeline 4 conveys the paint to the corresponding spraying station 5 through the material conveying end on one hand, and returns the paint to the second main pipeline 3 through the return end on the other hand, namely the paint can circularly flow among the first main pipeline 2, the branch pipeline 4 and the second main pipeline 3, and the branch pipeline paint circulation is realized.
According to the invention, the paint can be controlled to circularly flow among the first main pipeline 2, the branch pipeline 4 and the second main pipeline 3, namely 'branch pipeline paint circulation' can be realized, so that the paint does not precipitate in the branch pipeline 4 in a non-working state, and the paint in the branch pipeline 4 does not need to be emptied before work, thereby well improving the utilization rate of the paint. Secondly, two main lines are the equal diameter pipeline that can lead to the pearl for can adopt and walk pearl recovery (main line) paint vehicle and wash the main line (can with walk pearl looks adaptation promptly), and retrieve the paint vehicle and wash the mode of main line through walking the pearl, can effectually promote the rate of utilization of paint vehicle and reduce the emission of waste liquid. In addition, "two main line structures" not only can adapt to the paint vehicle of high viscosity, can also control first main line 2 and second main line 3 and carry the paint vehicle for spraying station 5 simultaneously when spraying station 5 has the instantaneous large-traffic demand, and this can assist the spraying effect that promotes the automobile coating.
In a specific implementation process, the pipeline regulating and controlling assembly comprises a first upstream valve 21 communicated between an upstream interface of the first main pipeline 2 and an outlet end of the circulating pump 11, a first downstream valve 22 communicated between a downstream interface of the first main pipeline 2 and a return end of the circulating tank 12, a second upstream valve 31 communicated between an upstream interface of the second main pipeline 3 and an outlet end of the circulating pump 11, and a second downstream valve 32 communicated between a downstream interface of the second main pipeline 3 and a return end of the circulating tank 12.
In the actual coating process, the on-off control of the positions of the upstream interfaces and the downstream interfaces of the first main pipeline 2 and the second main pipeline 3 can be realized by controlling the first upstream valve 21, the first downstream valve 22, the second upstream valve 31 and the second downstream valve 32, which is beneficial to better control the circulation and the transportation of paint, and can assist in improving the spraying effect of automobile coating.
In a specific implementation process, an inlet end of the first downstream valve 22 is communicated with a downstream interface of the first main pipeline 2, and a first back pressure generating assembly 23 is communicated between an outlet end of the first downstream valve 22 and a feed back end of the circulation tank 12; the inlet end of the second downstream valve 32 is connected to the downstream connection of the second main pipeline 3, and a second back pressure generating assembly 33 is arranged between the outlet end of the second downstream valve 32 and the return end of the circulation tank 12.
In the actual coating process, the back pressure values at the tail ends of the first main pipeline 2 and the second main pipeline 3 are adjusted, so that the following effects can be achieved: 1) the auxiliary guarantee that the paint supply pressure of each spraying station 5 is within the process requirement range, namely, the guarantee that the outlet of each spraying gun pipeline 4 has proper spraying pressure during spraying. 2) Different pressure differences are formed between the first main pipeline 2 and the second main pipeline 3, and paint in the main pipeline and the branch pipelines 4 is in high-pressure and low-speed circulation in a working circulation mode; in the full circulation mode, the paint in the main pipeline and the branch pipeline 4 is in normal circulation; in the energy-saving circulation mode, the paint in the main pipeline and the branch pipeline 4 is in low-pressure and low-speed circulation. Therefore, the arrangement of the first back pressure generating assembly 23 and the second back pressure generating assembly 33 and the arrangement position thereof in the present invention are beneficial to better control the paint circulation and delivery.
In a specific implementation, as shown in fig. 2, the first back pressure generating assembly 23 includes: a first back-pressure valve 201 communicating the outlet end of the first downstream valve 22 and the return end of the circulation tank 12, respectively, a first gas source 206 for supplying gas to the first back-pressure valve 201, and a first gas pipe for communicating the first gas source 206 and the back-pressure regulation end of the first back-pressure valve 201; the first air pipe is communicated with a first electromagnetic valve 202 and a first pneumatic pressure reducing valve 203 which are mutually arranged in series, and a first auxiliary electromagnetic valve 204 and a first auxiliary pneumatic pressure reducing valve 205 which are mutually arranged in series and are parallel to the first electromagnetic valve 202 and the first pneumatic pressure reducing valve 203; the first backpressure valve 201, the first solenoid valve 202, the first pneumatic pressure reducing valve 203, the first auxiliary solenoid valve 204 and the first auxiliary pneumatic pressure reducing valve 205 are all controlled by the control unit.
As shown in connection with fig. 3, the second back pressure generating assembly 33 includes: a second backpressure valve 301 for respectively communicating the inlet end of the second downstream valve 32 and the return end of the circulation tank 12, a second gas source 306 for supplying gas to the second backpressure valve 301, and a second gas pipe for communicating the second gas source 306 and the backpressure regulation end of the second backpressure valve 301; a second electromagnetic valve 302 and a second pneumatic pressure reducing valve 303 which are arranged in series with each other, and a second auxiliary electromagnetic valve 304 and a second auxiliary pneumatic pressure reducing valve 305 which are arranged in series with each other and are connected in parallel with respect to the second electromagnetic valve 302 and the second pneumatic pressure reducing valve 303 are communicated with each other; the second backpressure valve 301, the second solenoid valve 302, the second pneumatic pressure reducing valve 303, the second auxiliary solenoid valve 304 and the second auxiliary pneumatic pressure reducing valve 305 are all controlled by the control unit.
In the invention, the first backpressure generating assembly 23 and the second backpressure generating assembly 33 can conveniently adjust the backpressure values at the tail ends of the first main pipeline 2 and the second main pipeline 3 by adopting the structure, so that the system can be respectively controlled to enter a working circulation mode (main pipeline working pressure condition circulation), a full circulation mode (main pipeline and branch pipe circulation) and an energy-saving circulation mode (main pipeline low-pressure circulation), the requirements of working pressure and spraying flow can be met, and simultaneously, anti-sedimentation circulation and energy-saving circulation can be realized in a non-working state.
Example two:
the embodiment discloses a circulation control method of a double-main-pipe circulation paint conveying and mixing system on the basis of the first embodiment.
The embodiment of the invention discloses a circulation control method implemented based on the double-main-pipe circulation paint conveying and mixing system, which is used for controlling the system to enter a working circulation mode when a spraying station works, and specifically comprises the following steps as shown in fig. 4:
s1: controlling the first auxiliary electromagnetic valve to be opened, and controlling the pressure value of the outlet of the first auxiliary pressure reducing valve to be regulated to the minimum value, so that the back pressure value of the first back pressure valve is zero;
s2: controlling the second electromagnetic valve to be opened, and controlling the pressure value of the outlet of the second pressure reducing valve to be adjusted to the maximum value, so that the back pressure value of the second back pressure valve is the maximum value;
s3: gradually controlling and increasing the pressure value of the outlet of the first auxiliary pressure reducing valve, and gradually controlling and adjusting the pressure value of the outlet end of the circulating pump to a design pressure value, so that the paint at the outlet end of the circulating pump flows into the first main pipeline; when the flow of the outlet end of the circulating pump reaches the designed circulating flow of the first main pipeline, acquiring a backpressure value P1H of the first backpressure valve;
s4: gradually controlling and reducing the pressure value of the outlet of the second pressure reducing valve to enable the paint at the outlet end of the circulating pump to be shunted to the second main pipeline; when the flow of the outlet end of the circulating pump reaches the sum of the design circulating flow of the first main pipeline and the design circulating flow of the second main pipeline, acquiring a back pressure value P2H of the second back pressure valve;
s5: the backpressure values of the first backpressure valve and the second backpressure valve are controlled and adjusted to P1H and P2H respectively, so that the system is in a work circulation mode.
In the working circulation mode, the paint supply pressure of each spraying station can be ensured to be within the process requirement range (generally 5-7bar is required by a manual station, 6-10bar is required by a robot station), and meanwhile, the paint is ensured not to be precipitated in the circulation of the main pipeline. At the moment, the paint in the main pipelines is in high back pressure circulation, the paint is in a spraying or spraying standby state, the flow rate of the paint in the first main pipeline flowing to the second main pipeline through the branch pipelines of the spraying stations is small, the sprayed paint is mainly provided by the first main pipeline when the flow rate required by each spraying point is small, and the paint is simultaneously supplied to the branch pipelines by the first main pipeline and the second main pipeline when each spraying point has the requirement of instantaneous large flow rate. The control system enters a working circulation mode, so that the adjustment of the paint flow distribution between the first main pipeline and the second main pipeline is realized, and the paint utilization rate and the spraying effect of automobile coating can be well improved.
In the specific implementation process, when the stop time of the spraying station exceeds a set value, the control system enters a full-circulation mode, and the method specifically comprises the following steps:
controlling the back pressure value of the first back pressure valve to be the middle back pressure value P1M, and controlling the back pressure value of the second back pressure valve to be the low back pressure value P2L; the pressure value of the medium back pressure value P1M is 3-6 bar, and the pressure value of the low back pressure value P2L is 0-3 bar. In this embodiment, the system enters the full-circulation mode after the spraying station stops working for more than two hours.
And under the full circulation mode, the paint can be ensured not to be precipitated in the main pipeline and the branch pipelines. At the moment, the flow rate of the paint in the first main pipeline flowing to the second main pipeline through the branch pipelines of the spraying stations is larger, so that the paint flows in the main pipelines and the branch pipelines without precipitating. The control system enters a full circulation mode, so that the paint is not precipitated in the branch pipeline in a non-working state, and the paint in the branch pipeline is not required to be emptied before work, and the utilization rate of the paint can be improved well.
In the specific implementation process, when the spraying station stops working and the full cycle time exceeds a set value, the control system enters an energy-saving cycle mode, and the method specifically comprises the following steps:
controlling the back pressure value of the first back pressure valve to a low back pressure value P1L, and controlling the back pressure value of the second back pressure valve to zero; the pressure value of the low back pressure value P1L is 0-3 bar. In this embodiment, the system enters the energy-saving circulation mode after the spraying station stops working and the full circulation time exceeds two hours.
Under the energy-saving circulation mode, the paint can be ensured not to be precipitated in the main pipeline. At the moment, the circulating pump supplies paint to the first main pipeline and the second main pipeline simultaneously, the paint circulating speed in the two main pipelines is equal to or slightly larger than the lowest non-settling speed (usually, the water-based paint is 0.1m/s, and the oil-based paint is 0.3m/s), and the flow rate of the paint in the first main pipeline flowing to the second main pipeline through the branch pipelines of each spraying station is very small. The control system of the invention enters an energy-saving circulation mode, which not only can ensure that the paint is not precipitated in the first main pipeline and the second main pipeline, but also can reduce the energy consumption of the system as much as possible.
The backpressure values of the system are different under different circulation modes due to different factors such as the type of a circulating pump, the viscosity of conveyed paint, the length of a main pipeline, the length of a branch pipeline, the inner diameter of the branch pipeline and the like. Generally, when an electric pump is used as a circulating pump, the paint with high viscosity is used and the length of a main pipeline is long, the pressure value of P1H is 4-5bar, the pressure value of P2H is 4-5bar, the pressure value of P1M is 3bar, and the pressure value of P1L is 0 bar; when a pneumatic pump is used as a circulating pump and low-viscosity paint and the length of a main pipeline is short, the pressure value of P1H is 6-8bar, the pressure value of P2H is 6-8bar, the pressure value of P1M is 6bar, the pressure value of P1L is 3bar, the pressure of the outlet of the pneumatic pump can be automatically adjusted, and the pressure difference between the inlet and the outlet of the main pipeline between the outlet of the circulating pump and the inlet of a back pressure valve is approximately equal under the condition of different circulating modes, so that the paint flow speed in the main pipeline is prevented from being changed too much due to the change of back pressure. Therefore, in the embodiment, the pressure values of P1H and P2H are 4-9bar, the pressure value of P1M is 3-6 bar, and the pressure values of P1L and P2L are 0-3 bar. The aim is to better adapt to various working conditions so as to improve the spraying effect of automobile coating.
Specifically, in this embodiment, the selection of the inner diameters of the first main pipeline and the second main pipeline should be capable of simultaneously adapting to the three circulation modes, so the selection of the inner diameters of the main pipelines is described as follows:
the internal diameter of the main conduit is related to the length of the conduit, the viscosity of the paint and the number of painting stations, so the theoretical size of the internal diameter of the main conduit satisfies the following formula:
wherein mu represents the paint viscosity; Δ p represents the maximum allowable pressure differential across the main pipeline; q represents the paint flow rate in each line; l represents the length of the main pipeline; d represents the inner diameter of the main conduit. Meanwhile, the inner diameter of the main pipeline also meets the flow velocity in the pipe in the conveying process, generally, when the oil paint is conveyed, the flow velocity of the paint is 0.3-0.7 m/s, when the water paint is conveyed, the flow velocity of the paint is 0.1-0.3 m/s, and the pipe diameter is designed according to the flow velocity required by a paint manufacturer. The paint flow rate is related to the number of spray stations, with 0.9L/min for oil paint and 0.7L/min for water paint per station. According to the formula, the required size of the paint pipeline can be calculated by combining the paint flow rate requirement in the pipe, and the inner diameter size of the main pipeline can be obtained by rounding the calculated size.
Example three:
compared with the first embodiment, the difference of the present embodiment is that the paint supplying module 1 further includes a ball-moving component.
As shown in fig. 5: in this embodiment, the first upstream valve 21 and the second upstream valve 31 are converging three-way ball valves capable of passing through beads, and the first downstream valve 22 and the second downstream valve 32 are diverging three-way ball valves capable of passing through beads; the outlet end of the first upstream valve 21 is connected to the upstream connection of the first main line 2, and one inlet end is connected to the outlet end of the circulation pump 11; the outlet end of the second upstream valve 31 is connected to the upstream connection of the second main line 3, and one inlet end is connected to the outlet end of the circulation pump 11; the inlet end of the first downstream valve 22 is in communication with the downstream interface of the first main line 2 and one outlet end is in communication with the first back-pressure valve 201; the inlet end of the second downstream valve 32 is in communication with the downstream interface of the second main line 3, and one outlet end is in communication with the second back-pressure valve 301;
the paint supply module 1 further comprises a ball-moving assembly, wherein the ball-moving assembly comprises a first ball-moving emitting device 61 communicated with the other inlet end of the first upstream valve 21, a first ball-moving receiving device 62 communicated with the other outlet end of the first downstream valve 22, a second ball-moving emitting device 71 communicated with the other inlet end of the second upstream valve 31 and a second ball-moving receiving device 72 communicated with the other outlet end of the second downstream valve 32; a first ball is correspondingly arranged between the first ball-moving emitting device 61 and the first ball-moving receiving device 62, and a second ball is arranged between the second ball-moving emitting device 71 and the second ball-moving receiving device 72.
In the actual coating process, the types and connection modes of the first upstream valve 21, the second upstream valve 31, the first downstream valve 22 and the second downstream valve 32, and the arrangement and connection modes of the bead-moving assemblies enable the double-main-pipe circulating paint conveying and dispensing system to realize the recovery of paint in the main pipe through the bead-moving assemblies, and further clean the main pipe through the existing means. According to the invention, the utilization rate of the paint can be effectively improved and the discharge amount of waste liquid can be reduced by the way of recycling the paint and cleaning the main pipeline by rolling the beads.
Example four:
the embodiment discloses a paint recovery control method of a double-main-pipe circulating paint conveying and mixing system on the basis of the third embodiment.
The embodiment discloses a paint recovery control method implemented based on the double-main-pipe circulating paint conveying and mixing system, as shown in fig. 6, when paint in a first main pipe and a second main pipe is recovered, the paint recovery control method comprises the following steps:
a1: controlling the circulating pump to stop working, and controlling the first backpressure valve and the second backpressure valve to be fully opened until backpressure values in the first main pipeline and the second main pipeline are zero;
a2: correspondingly arranging the first moving ball and the second moving ball in the first moving ball launching device and the second moving ball launching device;
a3: controlling and adjusting the first upstream valve and the second upstream valve to enable the first ball-moving emission device and the second ball-moving emission device to be communicated with upstream interfaces of the first main pipeline and the second main pipeline respectively; controlling and adjusting the first downstream valve and the second downstream valve to enable the first ball-moving receiving device and the second ball-moving receiving device to be communicated with downstream interfaces of the first main pipeline and the second main pipeline respectively;
a4: and supplying gas to the first bead running and launching device and the second bead running and launching device, and starting the first bead running and the second bead running to enable the first bead running and the second bead running to respectively move towards the first bead running and receiving device and the second bead running and receiving device correspondingly, so that paint in the first main pipe and the second main pipe is correspondingly recovered into the first bead running and receiving device and the second bead running and receiving device.
The working states of the ball walking assembly, the first upstream valve, the second upstream valve, the first downstream valve and the second downstream valve are controlled by adopting the steps, so that paint in the first main pipeline and the second main pipeline can be effectively recovered by the ball walking, and the pipelines can be further cleaned by the existing means. According to the invention, the utilization rate of the paint can be effectively improved and the discharge amount of waste liquid can be reduced by the way of recycling the paint and cleaning the main pipeline by rolling the beads.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The double-main-pipe circulating paint conveying and mixing system for automobile coating comprises a plurality of spraying stations, paint supply modules for supplying paint to the spraying stations, and a control unit for controlling the paint supply modules; the paint supply module comprises a circulating tank for storing paint, and a circulating pump with an inlet end communicated with a discharge end of the circulating tank; the method is characterized in that: the paint supply module also comprises a first main pipeline and a second main pipeline which are respectively communicated with the outlet end of the circulating pump, a pipeline regulating and controlling component for regulating and controlling the on-off state of the pipelines of the first main pipeline and the second main pipeline, and a branch pipeline for conveying paint to the corresponding spraying station;
the first main pipeline and the second main pipeline are equal-diameter pipelines capable of being communicated with beads;
the upstream interfaces of the first main pipeline and the second main pipeline are respectively communicated with the outlet end of the circulating pump, and the downstream interfaces are respectively communicated with the material return end of the circulating tank; the branch pipeline is provided with a delivery end for delivering paint to the spraying station, and the supply end of the branch pipeline is communicated with the first main pipeline and the return end is communicated with the second main pipeline.
2. The double main pipe circulating paint conveying and mixing system for automobile painting as claimed in claim 1, wherein: the pipeline regulation and control subassembly includes that the intercommunication sets up the first upstream valve between the exit end of the upstream interface of first main line and circulating pump and the intercommunication sets up the first downstream valve between the low reaches interface of first main line and the feed back end of circulating tank to and the intercommunication sets up the second upstream valve between the exit end of the upstream interface of second main line and circulating pump and the intercommunication sets up the second downstream valve between the feed back end of the low reaches interface of second main line and circulating tank.
3. The double main pipe circulating paint conveying and mixing system for automobile painting as claimed in claim 2, wherein: the inlet end of the first downstream valve is communicated with a downstream interface of the first main pipeline, and a first back pressure generation assembly is communicated between the outlet end of the first downstream valve and the return end of the circulating tank; the inlet end of the second downstream valve is communicated with a downstream interface of the second main pipeline, and a second back pressure generation assembly is arranged between the outlet end of the second downstream valve and the return end of the circulating tank in a communicated mode.
4. The double main pipe circulating paint conveying and mixing system for automobile painting according to claim 3, characterized in that: the first backpressure generating assembly comprises: the first backpressure valve is communicated with the outlet end of the first downstream valve and the feed back end of the circulating tank respectively, the first air source is used for supplying air to the first backpressure valve, and the first air pipe is used for communicating the first air source and the backpressure adjusting end of the first backpressure valve; the first air pipe is communicated with a first electromagnetic valve and a first pneumatic pressure reducing valve which are mutually connected in series, and a first auxiliary electromagnetic valve and a first auxiliary pneumatic pressure reducing valve which are mutually connected in series and are parallel to the first electromagnetic valve and the first pneumatic pressure reducing valve;
the first back pressure valve, the first electromagnetic valve, the first pneumatic pressure reducing valve, the first auxiliary electromagnetic valve and the first auxiliary pneumatic pressure reducing valve are all controlled by the control unit.
5. The double main pipe circulating paint conveying and mixing system for automobile painting according to claim 4, characterized in that: the second backpressure generating assembly comprises: the second backpressure valve is communicated with the inlet end of the second downstream valve and the feed back end of the circulating tank respectively, the second air source is used for supplying air to the second backpressure valve, and the second air pipe is used for communicating the second air source and the backpressure regulating end of the second backpressure valve; the second air pipe is communicated with a second electromagnetic valve and a second pneumatic pressure reducing valve which are mutually connected in series, and a second auxiliary electromagnetic valve and a second auxiliary pneumatic pressure reducing valve which are mutually connected in series and are parallel to the second electromagnetic valve and the second pneumatic pressure reducing valve;
the second back pressure valve, the second electromagnetic valve, the second pneumatic reducing valve, the second auxiliary electromagnetic valve and the second auxiliary pneumatic reducing valve are all controlled by the control unit.
6. The double main pipe circulating paint conveying and mixing system for automobile painting according to claim 5, characterized in that: the first upstream valve and the second upstream valve are confluence three-way ball valves capable of passing through the balls, and the first downstream valve and the second downstream valve are diversion three-way ball valves capable of passing through the balls;
the outlet end of the first upstream valve is communicated with an upstream interface of the first main pipeline, and one inlet end of the first upstream valve is communicated with the outlet end of the circulating pump; the outlet end of the second upstream valve is communicated with an upstream interface of the second main pipeline, and one inlet end of the second upstream valve is communicated with the outlet end of the circulating pump; the inlet end of the first downstream valve is communicated with a downstream interface of the first main pipeline, and one outlet end of the first downstream valve is communicated with the first backpressure valve; the inlet end of the second downstream valve is communicated with a downstream interface of the second main pipeline, and one outlet end of the second downstream valve is communicated with the second backpressure valve;
the paint supply module further comprises a ball moving assembly, wherein the ball moving assembly comprises a first ball moving emitting device communicated with the other inlet end of the first upstream valve, a first ball moving receiving device communicated with the other outlet end of the first downstream valve, a second ball moving emitting device communicated with the other inlet end of the second upstream valve and a second ball moving receiving device communicated with the other outlet end of the second downstream valve; the first ball moving device is arranged between the first ball moving emitting device and the first ball moving receiving device, and the second ball moving device is arranged between the second ball moving emitting device and the second ball moving receiving device.
7. The circulation control method of the double-main-pipe circulation paint conveying and mixing system is characterized in that: the system is implemented based on the double-main-pipe circulating paint conveying and mixing system in the claim 6; when the spraying station works, the control system enters a working circulation mode, and the method specifically comprises the following steps:
s1: controlling the first auxiliary electromagnetic valve to be opened, and controlling the pressure value of the outlet of the first auxiliary pressure reducing valve to be regulated to the minimum value, so that the back pressure value of the first back pressure valve is zero;
s2: controlling the second electromagnetic valve to be opened, and controlling the pressure value of the outlet of the second pressure reducing valve to be adjusted to the maximum value, so that the back pressure value of the second back pressure valve is the maximum value;
s3: gradually controlling and increasing the pressure value of the outlet of the first auxiliary pressure reducing valve, and gradually controlling and adjusting the pressure value of the outlet end of the circulating pump to a design pressure value, so that the paint at the outlet end of the circulating pump flows into the first main pipeline; when the flow of the outlet end of the circulating pump reaches the designed circulating flow of the first main pipeline, acquiring a backpressure value P1H of the first backpressure valve;
s4: gradually controlling and reducing the pressure value of the outlet of the second pressure reducing valve to enable the paint at the outlet end of the circulating pump to be shunted to the second main pipeline; when the flow of the outlet end of the circulating pump reaches the sum of the design circulating flow of the first main pipeline and the design circulating flow of the second main pipeline, acquiring a back pressure value P2H of the second back pressure valve;
s5: the backpressure values of the first backpressure valve and the second backpressure valve are controlled and adjusted to P1H and P2H respectively, so that the system is in a work circulation mode.
8. The circulation control method of the double-main-pipe circulation paint conveying and mixing system as claimed in claim 7, wherein: when the time for stopping the spraying station exceeds a set value, the control system enters a full-circulation mode, and the method specifically comprises the following steps:
controlling the back pressure value of the first back pressure valve to be the middle back pressure value P1M, and controlling the back pressure value of the second back pressure valve to be the low back pressure value P2L; the pressure value of the medium back pressure value P1M is 3-6 bar, and the pressure value of the low back pressure value P2L is 0-3 bar.
9. The circulation control method of the double-main-pipe circulation paint conveying and mixing system as claimed in claim 8, wherein: when the spraying station stops working and the full cycle time exceeds a set value, the control system enters an energy-saving cycle mode, and the method specifically comprises the following steps:
controlling the back pressure value of the first back pressure valve to a low back pressure value P1L, and controlling the back pressure value of the second back pressure valve to a low back pressure value P2L; the pressure value of the low back pressure value P1L is 0-3 bar.
10. The paint vehicle recovery control method of the double-main-pipe circulating paint conveying and mixing system is characterized by comprising the following steps: the double-main-pipe circulating paint conveying and mixing system is implemented based on the double-main-pipe circulating paint conveying and mixing system in the claim 7; when paint in the first main pipeline and the second main pipeline is recovered, the method comprises the following steps:
a1: controlling the circulating pump to stop working, and controlling the first backpressure valve and the second backpressure valve to be fully opened until backpressure values in the first main pipeline and the second main pipeline are zero;
a2: correspondingly arranging the first moving ball and the second moving ball in the first moving ball launching device and the second moving ball launching device;
a3: controlling and adjusting the first upstream valve and the second upstream valve to enable the first ball-moving emission device and the second ball-moving emission device to be communicated with upstream interfaces of the first main pipeline and the second main pipeline respectively; controlling and adjusting the first downstream valve and the second downstream valve to enable the first ball-moving receiving device and the second ball-moving receiving device to be communicated with downstream interfaces of the first main pipeline and the second main pipeline respectively;
a4: and supplying gas to the first bead running and launching device and the second bead running and launching device, and starting the first bead running and the second bead running to enable the first bead running and the second bead running to respectively move towards the first bead running and receiving device and the second bead running and receiving device correspondingly, so that paint in the first main pipe and the second main pipe is correspondingly recovered into the first bead running and receiving device and the second bead running and receiving device.
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