CN115889059A - Workpiece water-based paint coating production line and process - Google Patents

Abstract

The invention provides a workpiece water-based paint coating production line and a process, wherein the coating production line comprises a pretreatment device, an automatic spraying device, a baking and curing device and a forced cooling device which are sequentially arranged along the coating and transporting direction of a workpiece; the pretreatment device is used for pretreating the surface of a workpiece to be coated; the automatic spraying device is used for spraying water-based paint on the surface of the pretreated workpiece and leveling the water-based paint into a paint film; the baking and curing device comprises a drying furnace, and a low-temperature drying area and a high-temperature drying area which are arranged in the drying furnace, wherein the low-temperature drying area is used for drying and volatilizing moisture in a paint film, and the high-temperature drying area is used for drying and curing the volatilized moisture paint film; and the forced cooling device cools the surface of the dried and solidified workpiece. The invention adopts an integral coating production line and carries out coating in an automatic spraying mode, the coating efficiency is high, and the low-temperature drying area and the high-temperature drying area are arranged in the drying furnace, so that the moisture in a paint film is volatilized to the maximum extent, and the quality of the whole coating is improved.

Description

Workpiece water-based paint coating production line and process

Technical Field

The invention belongs to the technical field of coating, and particularly relates to a water-based coating production line and a water-based coating process for workpieces.

Background

Engineering machinery is mostly in outdoor operation, and due to poor construction environment, the working condition is severe, the probability of rusting in the using process of equipment is higher, and therefore, the requirements on the corrosion resistance and the decorative performance of the coating are higher. With the increase of environmental protection pressure, more and more enterprises begin to introduce water-based paint coating. The construction of a matched coating production line puts high requirements on the functionality, the appearance quality, the production efficiency and the process rationality of the coating. The application of the traditional engineering machinery part coating in the engineering machinery industry is not ideal, and especially, the design of some old coating equipment has a lot of defects because the workpiece is coated by adopting a manual coating mode, even some host factories take an independent closed workshop as a coating operation site during production, so that paint mist is diffused in the whole production site during the paint spraying operation, and great threat is caused to human bodies and the surrounding environment; the coating quality is poor, the paint film adhesion is poor, the production efficiency is low, and the quality of products in each batch can not be effectively guaranteed.

Disclosure of Invention

The invention mainly aims to provide a production line and a process for coating water-based paint on workpieces, and aims to solve the technical problem of poor coating quality caused by the traditional manual spraying of the water-based paint.

In order to achieve the above object, the present invention provides a water-based paint coating line for workpieces, comprising:

the pretreatment device is used for pretreating the surface of a workpiece to be coated;

the automatic spraying device is used for spraying water-based paint on the bottom surface and the top surface of the pretreated workpiece in sequence and leveling the water-based paint into paint films;

the baking and curing device comprises a drying furnace, and a low-temperature drying area and a high-temperature drying area which are arranged in the drying furnace, wherein the low-temperature drying area is used for drying and volatilizing moisture in the paint film, and the high-temperature drying area is used for drying and curing the paint film with volatilized moisture; and

and the forced cooling device is used for cooling the surface of the dried and solidified workpiece.

In an embodiment of the invention, the automatic spraying device comprises a spraying chamber and a plurality of six-axis spray painting robots arranged in the spraying chamber, a spraying station for bearing the workpiece is arranged in the spraying chamber, the six-axis spray painting robots are respectively arranged on the side wall and the top wall of the spraying chamber, a plurality of mixed gas spraying nozzles are arranged on the six-axis spray painting robots, and an air inlet pipe and an air outlet pipe are respectively arranged at the bottom and the bottom of the spraying chamber.

In the embodiment of the invention, an air guide chamber is further arranged below the paint spraying chamber, a T-shaped air guide channel communicated with the paint spraying chamber is formed in the air guide chamber, paint mist catching boxes positioned on two sides of the T-shaped air guide channel are further arranged in the air guide chamber, a Venturi throat communicated with the paint mist catching boxes is arranged on two sides of the bottom of the T-shaped air guide channel, and a patrol platform for operators to operate is formed between the paint mist catching boxes on two sides.

In an embodiment of the present invention, the workpiece water-based paint coating line further includes a centralized paint conveying and mixing system for conveying water-based paint to the six-axis painting robot, and the centralized paint conveying and mixing system includes:

the coating barrel is provided with two feeding holes and two discharging holes, the two feeding holes are respectively communicated with an external water source and a coating storage device, and a stirrer for mixing and stirring water and coating is arranged in the coating barrel; and

and the conveying pipeline is communicated with the discharge hole of the paint bucket and is used for conveying the mixed water-based paint in the paint bucket to the six-axis paint spraying robot.

In an embodiment of the present invention, the baking and curing device further includes a hot air circulation heating system disposed in the drying furnace, and when the workpiece is located in the low-temperature drying region, the hot air circulation heating system is controlled to operate at a low temperature, and when the workpiece is located in the high-temperature drying region, the hot air circulation heating system is controlled to operate at a high temperature.

In an embodiment of the present invention, a workpiece water-based paint coating process is further provided, which is applied to the workpiece water-based paint coating production line described above, and the workpiece water-based paint coating process includes:

step S10: preprocessing a workpiece before coating;

step S20: automatically and uniformly spraying the water-based paint on the bottom surface and the top surface of the workpiece and leveling to form a paint film;

step S30: drying the paint film on the workpiece to volatilize water in the paint film and solidify the volatilized water paint film;

step S40: and cooling the workpiece to a preset temperature.

In an embodiment of the present invention, the step S10 includes:

step S11: performing shot blasting treatment on the bottom surface and the top surface of the workpiece;

step S12: degreasing and silane treating the workpiece subjected to shot blasting by adopting a spray type treatment mode;

step S13: the workpiece is preheated before spraying.

In an embodiment of the present invention, the step S20 includes:

step S21: spraying water paint on the bottom surface of the workpiece;

step S22: leveling a workpiece with the bottom surface sprayed with the water-based paint in a leveling chamber for a first preset time;

step S23: spraying water paint on the top surface of the workpiece;

step S24: and leveling the workpiece with the top surface sprayed with the water-based paint in a leveling chamber for a first preset time.

In an embodiment of the present invention, the step 30 comprises:

step S31: placing the sprayed workpiece on a low-temperature drying area, controlling the hot air circulation heating system to be started and heating at constant temperature for a second preset time to volatilize water in the paint film;

step S32: and moving the workpiece which is pre-dried on the low-temperature drying area to the high-temperature drying area, starting the hot air circulation heating system, and heating at constant temperature for a third preset time so as to cure the paint film with water after volatilization.

In an embodiment of the invention, the workpiece water-based paint coating process further includes the steps of:

in the spraying process, the thickness of the coating is detected on line in real time;

and controlling the flow rate of the water-based paint sprayed by the mixed gas spraying nozzle according to the detection result of the coating.

Through the technical scheme, the water-based paint coating production line for the workpiece provided by the embodiment of the invention has the following beneficial effects:

before the water-based paint is coated on the workpiece, firstly, a pretreatment device is adopted to pretreat the surface of the workpiece to be coated; then respectively spraying water-based paint on the surface of the pretreated workpiece by using an automatic spraying device and leveling to form a paint film; after the spraying is finished, the workpiece sprayed with the water-based paint is placed on a low-temperature drying area in a drying furnace to be heated at low temperature so as to dry and volatilize water in a paint film; and transferring the workpiece to a high-temperature drying area for high-temperature heating to dry and solidify the volatilized water paint film, and finally cooling the surface of the dried and solidified workpiece by adopting a forced cooling device to finish coating the water-based paint. This application adopts a holistic application to produce the line and carry out the application through automatic spraying's mode, and application efficiency is high to set up low temperature drying district and high temperature drying district in with the drying oven, in order realizing the at utmost to volatilize the moisture in the lacquer membrane, reach the best solidification effect, and prevent that the lacquer film surface from producing defects such as orange peel, and then improved the quality of whole coating.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of an exemplary embodiment of an aqueous coating line for workpieces;

fig. 2 is a schematic structural diagram of an automatic coating device according to an embodiment of the present invention.

Description of the reference numerals

Detailed Description

The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.

The engineering mechanical product has good decoration and mechanical properties, and also has excellent corrosion resistance and weather resistance. The paint should resist impact and vibration during construction, and can not be rusted or lose luster and color in a short period. The specific index parameters show that the thickness of a paint film is usually 80-120 um, the glossiness can reach more than 90%, the mechanical performance index can also reach the level of solvent-based paint, and some mainstream machinery plants even put high requirements on the leveling property, the metal texture and the distinctness of image of the paint film.

The traditional coating equipment is often incomplete in function planning, lacks necessary shot blasting and drying facilities, is heavy in structural parts of engineering machinery, is complicated in surface characteristics, is mostly made of medium-thickness plates, is affected by working procedures such as blanking, forming, welding and processing, is serious in surface corrosion, welding slag and oil stain, and needs to be polished for derusting, oxide skin removal and other operations before coating. Meanwhile, the production property of the engineering machinery is generally small-batch and multi-variety, the production is difficult to organize according to different product categories, and because necessary curing equipment is lacked, the bench type production can be carried out only by a manual mode, the construction of a high-level coating production line cannot be carried out, and the production efficiency is low.

In view of this, as shown in fig. 1, in an embodiment of the present invention, there is provided a workpiece water paint coating line, including sequentially arranged along a coating transport direction of a workpiece 60:

the pretreatment device 20 is used for pretreating the surface of the workpiece 60 to be coated;

the automatic spraying device 30 is used for spraying water-based paint on the bottom surface and the top surface of the workpiece 60 after pretreatment in sequence and leveling the water-based paint into paint films;

the baking and curing device 40 comprises a drying furnace, and a low-temperature drying area and a high-temperature drying area which are arranged in the drying furnace, wherein the low-temperature drying area is used for drying and volatilizing moisture in a paint film, and the high-temperature drying area is used for drying and curing the paint film with volatilized moisture; and

and the forced cooling device 50 is used for cooling the surface of the workpiece 60 after drying and curing.

Because the water-based paint contains moisture, the moisture in the paint film is preferably fully volatilized before curing, then drying and curing are carried out, and a high-low temperature drying area is arranged while good air supply is ensured during drying so as to volatilize the moisture to the maximum degree and improve the curing quality of the paint film. This application is produced line and is scribbled through the mode of automatic spraying through adopting a holistic application, and application efficiency is high to set up low temperature drying district and high temperature drying district in with the drying oven, in order realizing the at utmost to volatilize the moisture in the lacquer membrane, reach the best solidification effect, and prevent that the lacquer film surface from producing defects such as orange peel, and then improved the quality of whole coating.

The pretreatment device 20 adopts a green and environment-friendly silane pretreatment process, and three stations are sequentially arranged in the pretreatment device 20 along the coating direction of the workpiece 60: the first station is a pre-degreasing station and a degreasing station, the second station is a washing station, a pure water washing station and a fresh pure water washing station, and the third station is a silane station, a pure water washing station and a fresh pure water washing station, so that the binding force of the coating and the surface of the workpiece 60 is improved, and the quality and the performance of a paint film are improved.

In the embodiment of the present invention, the automatic spraying device 30 includes a paint spraying chamber 35 and a plurality of six-axis paint spraying robots 36 arranged in the paint spraying chamber 35, a spraying station for carrying a workpiece 60 is arranged in the paint spraying chamber 35, the plurality of six-axis paint spraying robots 36 are respectively arranged on the side wall and the top wall of the paint spraying chamber 35, and the six-axis paint spraying robots 36 are provided with a plurality of mixed air spraying nozzles; during the painting process, the mixed gas spray heads on the plurality of six-axis painting robots 36 are engaged and extend above the workpiece 60 to simultaneously spray the water-based paint downwardly onto the surface of the workpiece 60. In addition, in order to realize the position movement of the mixed gas spraying nozzle, a driving assembly 37 for driving the six-axis painting robot 36 to move is further arranged in the painting chamber 35, and the driving assembly 37 may be in a linear driving structure of a motor and a screw rod, or in a driving form of driving an electric cylinder and the like, so as to realize the linear movement of the six-axis painting robot 36. When the six-axis spraying robot achieves the purpose of automatic spraying, the six-axis spraying robot 36 replaces manual operation, the quality of a paint film can be obviously improved, and the defects of different thickness, leakage, sagging, orange peel and the like of the paint film frequently generated by manual spraying can be effectively avoided. When the robot is selected and arranged, the design can be carried out by combining the product size and the chamber specification. The workpiece 60 may be programmed to travel automatically and work in conjunction with the six-axis painting robot 36, and the painting trajectory may be programmed using on-line or off-line programming techniques.

In addition, the water-based paint has low boiling point, slow evaporation and strict requirements on spraying environment, and is very easy to form sagging at low temperature and high humidity. Therefore, the temperature and humidity of the paint spray chamber 35 must be controlled within a reasonable range to avoid the defects of sagging and flowing. In general, the temperature of the construction environment is preferably about 25 ℃ and the relative humidity is preferably about 65%. However, when the temperature is lower than 5 ℃ or the relative humidity is higher than 80%, the operation is stopped. After the water-based paint is sprayed, if moisture in the paint does not volatilize out, the subsequent paint film can be foamed, so that the leveling time of the paint film is properly increased to ensure that a large amount of moisture in the paint film volatilizes out in time. Usually, the leveling time is set to be more reasonable within 10-15 min, so that the moisture in the paint film can be fully volatilized and discharged, and the paint film can be fully cured. However, the longer the leveling time is, the better the leveling time is, the longer the leveling time is, the paint film surface is too dry, and the coating is easy to generate orange peel and other defects. And experiments prove that the leveling temperature is preferably controlled to be between 30 and 40 ℃ so as to achieve the best paint film generation effect.

In addition, the spray booth 35 is designed to prevent the entry of external dust, particles and impurities, and the overspray during the spraying process can effectively capture paint mist splashed in the air during the coating process, and provide an operating environment with appropriate temperature, humidity and illuminance. In the prior art, a large amount of air is needed to be supplemented into the paint spraying chamber 35 in the paint spraying process, so that internal circulation cannot be realized, and the difference from the conventional paint spraying structural form in the prior art is that the paint spraying chamber 35 adopts a closed internal circulation air system structural form; specifically, be equipped with air-supply line and exhaust pipe respectively in the bottom and the bottom of spray booth 35, the inside air cyclic utilization that can realize spray booth 35 through the design of air-supply line and exhaust pipe only needs a small amount of fresh air can satisfy the demand, has reduced spray booth 35 the air supply volume, so equipment running cost and exhaust-gas treatment equipment investment cost all are lower.

On the other hand, as shown in fig. 2, the paint spray booth 35 of the present application also adopts a new carton-type dry paint spray booth structural design, specifically, a dynamic pressure chamber and a static pressure chamber are sequentially arranged above the paint spray booth 35 from top to bottom, an air inlet pipe is opened on the dynamic pressure chamber, an air diversion chamber is further arranged below the paint spray booth 35, the upper part of the air diversion chamber is communicated with the paint spray booth 35 through a grille, a T-shaped air diversion channel 38 communicated with the paint spray booth 35 is formed in the air diversion chamber, paint mist collection boxes 39 are further arranged at two sides of the T-shaped air diversion channel 38, venturi throats communicated with the paint mist collection boxes 39 are further arranged at two sides of the bottom of the T-shaped air diversion channel 38; the venturi throat guides the air in the air guiding channel into the paint mist collecting box 39, so that the air enters from the air inlet pipe, passes through the dynamic pressure chamber and the static pressure chamber, then enters the paint spraying chamber 35, enters the T-shaped air guiding channel 38 after carrying the paint mist in the paint spraying chamber 35, the air carrying the paint mist enters the paint mist collecting box 39 from the venturi throats on two sides of the bottom of the T-shaped air guiding channel 38 at a high speed in an inclined downward direction, then turns to an upward fishhole, and the paint mist is collected into the paint mist collecting box 39 in a three-dimensional manner in the process that the main flow direction of the air passes through each paint mist separating/collecting area of the paint mist collecting box 39 from bottom to top. After the paint mist in the air is collected, the clean air is converged into the exhaust pipe to complete the paint mist separating/collecting process, and the air is recycled or treated in an exhaust gas treatment device. In order to facilitate the movement of the paint mist capturing box 39, a guide rail is arranged at the bottom and is in sliding fit with the paint mist capturing box 39, so as to facilitate the pushing and pulling of the paint mist capturing box 39.

Furthermore, an inspection platform for operators to operate is formed between the paint mist capturing boxes 39 on the two sides, the inspection platform is located at the bottom of the T-shaped air guide channel 38, on one hand, the inspection platform plays a role in guiding air into the Venturi throat, and on the other hand, people can walk on the inspection platform, so that the paint mist accumulated in the T-shaped air guide channel 38 can be cleaned conveniently. This application has reduced investment and running cost through adopting the carton formula paint spray booth 35 structure, has avoided the production of paint spray booth 35 waste water.

In the embodiment of the invention, the workpiece water-based paint coating production line further comprises a centralized paint conveying and mixing system for conveying water-based paint to the spray painting six-axis robot 36, wherein the centralized paint conveying and mixing system can provide constant-temperature and constant-humidity control for paint conveying, automatically controls the paint spraying viscosity, and ensures the paint atomization effect and the coating leveling property. Compared with manual paint mixing, on one hand, the usage amount and the mixing amount of the paint can be realized, and the paint can be mixed at any time, so that waste caused by incomplete use of the paint after mixing is avoided. On the other hand, the paint proportioning precision is high, the paint mixing result consistency is good, and color difference caused by paint mixing inconsistency is avoided; the paint can be automatically proportioned and stirred, and is centrally conveyed and uniformly dispatched and distributed.

The centralized paint conveying and mixing system comprises a paint bucket and a conveying pipeline; the coating barrel is provided with a feeding hole and a discharging hole, the number of the feeding holes is two, the feeding holes are respectively communicated with an external water source and a coating storage device, and a stirrer for mixing stirring water and coating is arranged in the coating barrel. The coating storage device is used for storing the coating, and when the water and the coating are mixed in the coating barrel according to a certain preset proportion, the stirrer uniformly stirs the water and the coating in the coating barrel to form the required water-based coating; the conveying pipeline is communicated with a discharge port of the paint bucket and is used for conveying the mixed water-based paint in the paint bucket to the painting six-axis robot 36.

No matter in the low-temperature drying area or the high-temperature drying area, a special heating system is adopted for independently controlling drying, and the temperature of the heating system can be independently controlled. In detail, the baking and curing device 40 further includes a heated air circulation heating system disposed in the drying oven, when the workpiece 60 is located in the low-temperature drying area, the heated air circulation heating system is controlled to perform low-temperature operation, and when the moisture in the paint film is volatilized to a great extent, the workpiece 60 is placed in the high-temperature drying area, and the heated air circulation heating system is controlled to perform high-temperature drying operation. Wherein, the drying temperature of the high-temperature drying area can be controlled between 60 and 65 ℃, and the temperature of the low-temperature drying area can be controlled between 40 and 45 ℃. The heated air circulation heating system is used for heating the surface of the workpiece 60 in a heated air circulation mode, and compared with a heating mode of an infrared heating plate common in the prior art, the heated air circulation heating mode is milder in heating mode and more uniform in heating.

In addition, for the temperature in the management and control drying oven, a plurality of temperature measurement spare and overtemperature alarm system have been arranged along circumference in the drying oven, and a plurality of temperature measurement spare are used for measuring the temperature in the drying oven respectively and send the temperature information signal, and overtemperature alarm system receives the temperature information signal and sends the overtemperature early warning according to the temperature information signal. The temperature measuring part can be a common temperature sensor in the prior art, and the temperature sensors are arranged at the front, the back, the left, the right and the middle of the drying furnace, so that the temperature of the corresponding part can be detected; every temperature sensor all will detect temperature information signal and send for overtemperature alarm system, and when the temperature of one of them department exceeded the required stoving of drying-oven and predetermine the temperature, overtemperature alarm system all sent overtemperature early warning feedback to remind operating personnel drying-oven inside temperature overtemperature, and in time make counter-measures, avoid influencing the stoving solidification effect of drying-oven because of the high temperature or cross excessively.

In an embodiment of the present invention, a workpiece water-based paint coating process is further provided, which is applied to the above workpiece water-based paint coating production line, and the workpiece water-based paint coating process includes:

step S10: the surface of the workpiece 60 is pretreated before coating;

considering that the surface tension of water is large, the wetting effect of the water-based paint is poor, the defects of the substrate are not easily covered, and the water-based paint is easily influenced by oil stains, particles, dust and the like on the surface of the workpiece 60, so that higher requirements are put forward on the surface treatment (roughness, cleanliness and the like) of the substrate. The water-based paint coating needs to be done, the structural part must have good appearance quality before coating, the edge of a plate is horizontally and vertically arranged after the water-based paint coating, the structural part needs to be polished to be flat after welding, and a welding seam is attractive in appearance and free of defects. And secondly, the surface cleanliness of the base material is improved, and the defects of oil stain, particles, welding slag, oxide skin and the like on the surface of the workpiece 60 are thoroughly removed. And finally, selecting a proper sand mold, treating the surface of the base material, improving the roughness of the base material and ensuring good adhesive force between the paint and the base material.

Step S20: the water paint is automatically and evenly sprayed on the bottom surface and the top surface of the workpiece 60 and is leveled into a paint film;

step S30: drying the paint film on the workpiece 60 to volatilize water in the paint film and to cure the volatilized water paint film;

step S40: the workpiece 60 is cooled to a predetermined temperature.

When a paint film is just under the line, the surface temperature of the workpiece 60 is high, the coating is soft, and subsequent primer polishing and finish piece transferring are influenced, so that after the primer and the finish are dried, the workpiece 60 needs to be opened and cooled and stay for 10min to reduce the surface temperature. Specifically, the forced cooling device 50 adopts a fan blowing mode to cool the paint film surface.

In an embodiment of the present invention, step S10 includes:

step S11: performing shot blasting on the top and bottom surfaces of the workpiece 60;

when the workpiece 60 is subjected to shot blasting treatment, conventional shot blasting equipment in the prior art is adopted, and the shot blasting equipment can effectively remove oxide skin, welding slag and impurities on the surface of the workpiece 60, eliminate welding stress and increase the surface binding force of a paint film and a base material, so that the surface rust prevention quality of a product is greatly improved. The throwing heads can be arranged in a profiling mode according to the shape of the workpiece 60, the walking speed and the number of workpieces 60 capable of throwing the balls simultaneously can be automatically adjusted according to the size of the workpiece 60, and a throwing program can be made according to the length of the workpiece 60, so that idle throwing is reduced.

Step S12: degreasing and silane treating the workpiece 60 after shot blasting treatment by adopting a spray type treatment mode;

step S13: the workpiece 60 is preheated prior to spraying.

Since the water-based paint is sensitive to the temperature and humidity of the construction environment, if the temperature difference between the workpiece 60 and the construction environment is too large, the defects of sagging, flowing, no film coating and the like are easily caused, so the workpiece 60 is usually preheated properly before priming, and far infrared irradiation equipment can be adopted for preheating. The preheating can effectively prevent the problem that the primer is easy to sag in the spraying process, promote the surface drying of the water-based primer, reduce the flash-dry time between the wet-on-wet of the primer and the finish and improve the production efficiency. In general, the preheating temperature of the surface of the workpiece 60 is preferably 35 ± 5 ℃.

This application is before the spraying, through throwing tile treatment, degrease, silane processing and preheating treatment to work piece 60 surface in proper order, can guarantee to laminate better between work piece 60 and the water based paint after the preliminary treatment, makes the biggest japanning guarantee before the spraying, is favorable to better improvement paint film quality.

In an embodiment of the present invention, step S20 includes:

step S21: spraying water-based paint on the bottom surface of the workpiece 60;

step S22: leveling a workpiece 60 with the bottom surface sprayed with the water-based paint in a flow flat chamber for a first preset time;

step S23: spraying water paint on the top surface of the workpiece 60;

step S24: the workpiece 60 with the top surface sprayed with the water-based coating is leveled within the flow plane chamber for a first predetermined period of time.

Wherein the range of the first preset duration is 10-15 min.

In order to realize the spraying and leveling of the bottom surface and the top surface of the workpiece 60, a primer spraying station 31, a primer leveling station 32, a finish spraying station 33 and a finish leveling station 34 are arranged in the paint spraying chamber 35; in the spraying process, firstly, a workpiece 60 is placed on a primer spraying station 31, the bottom surface of the workpiece 60 faces a spray head of a spraying six-axis robot, the spraying six-axis robot is adopted to firstly spray the bottom surface of the workpiece 60, and after the spraying is finished, leveling is carried out on a primer leveling station 32 for 10-15 min, so that a paint film is formed on the bottom surface of the workpiece 60; and then turning the workpiece 60 and transferring the workpiece to a finish paint spraying station 33, wherein the top surface of the workpiece 60 faces a spray head of a six-axis spraying robot, the six-axis spraying robot is adopted to spray the top surface of the workpiece 60, and after the spraying is finished, leveling is carried out on a finish paint leveling station 34 for 10-15 min, so that a paint film is formed on the top surface of the workpiece 60. This application is through carrying out the spraying respectively and form the paint film alone to the bottom surface and the top surface of work piece 60, the paint film quality of assurance two faces that can be better prevents that wherein one side from influencing the spraying finished paint effect of another side in the spraying process.

In an embodiment of the present invention, step 30 comprises:

step S31: placing the sprayed workpiece 60 on a low-temperature drying area, controlling a hot air circulation heating system to be started, and heating at constant temperature for a second preset time period to volatilize water in the paint film;

step S32: and moving the workpiece 60 which is subjected to pre-drying in the low-temperature drying area to the high-temperature drying area, starting a hot air circulation heating system, and heating at constant temperature for a third preset time period to cure the paint film with volatilized moisture. Wherein the second preset time and the third preset time range are 10-15 min.

When the paint film is dried in the low-temperature drying area to volatilize water in the paint film, the temperature needs to be set to be lower than that of the high-temperature drying area, and the paint film is heated gradually to prevent the paint film from generating wrinkles and other defects caused by overhigh temperature; moreover, the high-low temperature drying matching of the low-temperature drying area and the high-temperature drying area is achieved, so that a finally formed paint film is more uniform and smoother, and the quality of the paint film is improved.

In an embodiment of the present invention, the water-based paint coating process for workpieces further includes the steps of:

in the spraying process, the thickness of the coating is detected on line in real time;

and controlling the flow rate of the water-based paint sprayed by the spray gun according to the detection result of the coating.

In a traditional coating production line, a traditional contact type coating thickness gauge is only suitable for measuring the thickness of the coating after curing, and the thickness of the coating cannot be monitored in the production process. If the quality defects cannot be prevented in advance, once the problems are found, the method can only be reworked in batches, and the production efficiency is reduced. This application adopts paint film detection device to carry out on-line measuring to the coating thickness of spraying in-process, specifically, this paint film detection device can carry out real-time measurement to the coating thickness condition in process of production through taking the 3D formation of image detection technique among the prior art, realizes the membrane thick distribution condition of the complicated spare part of non-contact accurate measurement shape, can effectively avoid coating defect problem, is applicable to automatic application and produces the line, but automatic recording production process data and full flow are traceed back. If the average thickness of the coating detected in the spraying process exceeds the preset thickness, the spraying does not meet the preset requirement, meanwhile, the paint film detection device transmits the detected thickness distribution information to the control unit, and the control unit controls the flow rate of the water-based paint sprayed by the mixed gas spraying nozzle so as to control the thickness of the coating in the spraying process within the preset thickness range, thereby improving the spraying quality of the coating.

In addition, during the coating line planning of this application, introduced intelligent logistics conveying system 10, promptly: the intelligent logistics conveying system 10 introduces an intelligent logistics identification system and an automatic conveying technology on the basis of traditional logistics conveying, for example, a truss robot, a heavy AGV/RGV trolley, an automatic lifting tool and the like are adopted in the conveying process of the workpiece 60 to realize automatic workpiece loading of workpiece 60 coating. After the coated workpiece 60 is taken off line, the workpiece can be directly conveyed to an automatic stereoscopic warehouse for storage by adopting aerial EMS, the AGV/RGV, the robot and the chain conveyor are integrated through an automatic logistics system with unified planning, production links such as preassembly and final assembly are effectively connected, pull-type production is realized, a high-efficiency planned production chain is formed, and the production efficiency is improved. The intelligent logistics conveying system 10 can solve the problem of connection among all the working procedures, achieve short and smooth logistics and avoid intersection.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. The utility model provides a work piece water based paint coating line, its characterized in that includes that the coating transportation direction along work piece (60) arranges in proper order:

the pretreatment device (20) is used for pretreating the surface of the workpiece (60) to be coated;

the automatic spraying device (30) is used for spraying water-based paint on the bottom surface and the top surface of the workpiece (60) after pretreatment in sequence and leveling the water-based paint into paint films;

the baking and curing device (40) comprises a drying furnace, and a low-temperature drying area and a high-temperature drying area which are arranged in the drying furnace, wherein the low-temperature drying area is used for drying and volatilizing moisture in the paint film, and the high-temperature drying area is used for drying and curing the paint film after volatilizing moisture; and

and the forced cooling device (50) is used for cooling the surface of the dried and solidified workpiece (60).

2. The water-based paint coating production line for workpieces as claimed in claim 1, wherein the automatic spraying device (30) comprises a paint spray booth (35) and a plurality of six-axis spray painting robots (36) arranged in the paint spray booth (35), a spraying station for bearing the workpiece (60) is arranged in the paint spray booth (35), the six-axis spray painting robots (36) are arranged on the side wall and the top wall of the paint spray booth (35) respectively, a plurality of mixed gas spraying nozzles are arranged on the six-axis spray painting robots (36), and an air inlet pipe and an exhaust pipe are arranged at the bottom and the bottom of the paint spray booth (35) respectively.

3. The water-based paint coating production line for workpieces as claimed in claim 2, wherein an air guide chamber is further arranged below the paint spray chamber (35), a T-shaped air guide channel (38) communicated with the paint spray chamber (35) is formed in the air guide chamber, paint mist collecting boxes (39) located on two sides of the T-shaped air guide channel (38) are further arranged in the air guide chamber, venturi throats communicated with the paint mist collecting boxes (39) are arranged on two sides of the bottom of the T-shaped air guide channel (38), and inspection platforms for operators to operate are formed between the paint mist collecting boxes (39) on two sides.

4. The aqueous workpiece paint production line according to claim 2, further comprising a centralized paint conveying and mixing system for conveying aqueous paint to the six-axis painting robot (36), the centralized paint conveying and mixing system comprising:

the coating barrel is provided with two feeding holes and two discharging holes, the two feeding holes are respectively communicated with an external water source and a coating storage device, and a stirrer for mixing and stirring water and coating is arranged in the coating barrel; and

and the conveying pipeline is communicated with the discharge hole of the paint bucket and is used for conveying the mixed water-based paint in the paint bucket to the six-axis paint spraying robot (36).

5. The workpiece water-based paint coating production line according to claim 1, wherein the baking and curing device (40) further comprises a hot air circulation heating system arranged in the drying furnace, the hot air circulation heating system is controlled to operate at a low temperature when the workpiece (60) is located in the low-temperature drying zone, and the hot air circulation heating system is controlled to operate at a high temperature when the workpiece (60) is located in the high-temperature drying zone.

6. A workpiece water-based paint coating process is applied to the workpiece water-based paint coating production line of any one of claims 1 to 5, and comprises the following steps:

step S10: pre-treating a workpiece (60) before coating;

step S20: automatically and uniformly spraying the water-based paint on the bottom surface and the top surface of the workpiece (60) and leveling to form a paint film;

step S30: drying the paint film on the workpiece (60) to volatilize moisture in the paint film and to cure the volatilized moisture paint film;

step S40: the workpiece (60) is cooled to a predetermined temperature.

7. The water-based paint coating process for workpieces as claimed in claim 6, wherein the water-based paint coating process is characterized in that

The step S10 includes:

step S11: performing shot blasting on the top surface and the bottom surface of the workpiece (60);

step S12: degreasing and silane treating the workpiece (60) subjected to shot blasting treatment by adopting a spray type treatment mode;

step S13: the workpiece (60) is preheated prior to spraying.

8. The water-based paint coating process for workpieces according to claim 6, wherein the step S20 comprises:

step S21: spraying water paint on the bottom surface of the workpiece (60);

step S22: leveling a workpiece (60) with the bottom surface sprayed with the water-based paint in a flow flat chamber for a first preset time;

step S23: spraying water paint on the top surface of the workpiece (60);

step S24: the workpiece (60) with the top surface sprayed with the water-based paint is leveled in the flow flat chamber for a first preset time.

9. The water-based paint coating process for workpieces as claimed in claim 6, wherein the step 30 comprises:

step S31: placing the sprayed workpiece (60) on a low-temperature drying area, controlling the hot air circulation heating system to be started and heating at constant temperature for a second preset time so as to volatilize water in the paint film;

step S32: and moving the workpiece (60) which is pre-dried on the low-temperature drying area to the high-temperature drying area, and starting the hot air circulation heating system and heating at constant temperature for a third preset time to cure the paint film with volatilized moisture.

10. The water-based paint coating process for workpieces as claimed in claim 6, characterized by further comprising the steps of:

in the spraying process, the thickness of the coating is detected on line in real time;

and controlling the flow rate of the water-based paint sprayed by the gas-mixed spraying nozzle according to the detection result of the coating.

Images