CN117732701A - Surface coating process for plastic hardware products and automatic spraying production line - Google Patents

Abstract

The invention relates to a plastic hardware product surface coating process and equipment, wherein the coating process comprises the following steps: step a, cleaning and static electricity removing treatment of the surface of a workpiece: step b, spraying the surface of the workpiece by using a piezoelectric spray printing device special for paint and matching a manipulator; c, performing heat leveling to form a smooth paint film layer on the surface of the workpiece; step d, solidifying and shaping the workpiece through UV solidifying equipment; and e, detecting a finished product. According to the product paint spraying method and device, the piezoelectric type spray printing device is used for printing and spraying the product, so that the spraying precision can be improved, the problem that a non-spraying surface is covered by paint is avoided, the method and device are suitable for spraying various regular or irregular products, the paint is accurately covered on the surface of the product, the paint utilization rate can reach more than 99%, the production efficiency can be improved, the production cost is saved, and the emission is reduced and the environment is protected.

Description

Plastic hardware product surface coating technology and automated spraying production line

Technical areas:

The invention relates to the technical field of surface treatment technology and equipment, and specifically refers to a surface coating technology and automated spraying production line for plastic hardware products.

Background technique:

Plastic and hardware surface paint spraying currently mostly uses air spraying, electrostatic spraying and other methods. It usually needs to be carried out in a professional spray paint room. During the spraying process, a huge amount of paint mist will be generated, which requires a large amount of purification materials to be processed, and the paint utilization rate Low, environmental pollution is large and harmful to human body. Furthermore, during the spraying process, it is necessary to cover the parts of the workpiece surface that do not need to be sprayed with a film or use a mold to cover them, which can easily lead to defective products, low spraying accuracy, cumbersome processes, and low production efficiency.

In addition, UV curing processes are often used in surface treatment. These processes first transport the workpiece to the curing furnace through a conveyor mechanism and then perform UV curing processing. The curing process requires high UV energy, but the temperature cannot be too high. In actual operation In order to prevent the temperature from being too high, the UV lamp needs to be equipped with a cooling device. It is generally a simple air-cooling mode, which takes away the heat of the UV lamp through cold air. However, the existing air-cooling mode is more difficult to control and the temperature control accuracy is insufficient, making The working condition of the UV lamp is unstable.

Contents of the invention:

The purpose of the present invention is to overcome the shortcomings of existing products and provide a surface coating process for plastic hardware products and an automated spraying production line.

The technical solution adopted by the present invention is: a surface coating process for plastic hardware products. The coating process includes the following steps:

Step a, workpiece surface cleaning and static elimination treatment: clean the workpiece surface through snowflake purification equipment to remove particles and organic pollutants attached to the workpiece surface; at the same time, use ion wind to remove static electricity from the workpiece surface;

Step b: Transfer the workpiece processed in step a to the spraying station through a manipulator, and use a special piezoelectric spray printing device for paint and a manipulator to spray the surface of the workpiece; the spraying operation uses a solid content of 40%-50%. UV paint;

Step c. After the workpiece is sprayed, it is transferred to the hot leveling station through the robot and left to rest. The baking equipment is used to dry and level the surface of the workpiece for 3-5 minutes. The heat leveling temperature is 50℃±5℃, so that the workpiece A smooth paint film layer forms on the surface;

In step d, the workpiece is transferred from the hot leveling station to the UV curing station through a manipulator, and the workpiece is cured and shaped by UV curing equipment;

Step e, finished product inspection.

In the above coating process, the cleaning nozzle diameter of the snowflake purification equipment in step a is 4-8mm, the injection pressure is 4-8Bar, the _CO2 snowflake crystal size produced is 0.3μm-1μm, the cleaning power is 1-2Kw, and the CO liquid loss is Less than 0.8kg/min; the distance between the ion blower and the workpiece surface is 300mm±50mm, the air output is 40-60CFM, the coverage area is 40cm×60cm ² , and the product surface ion balance (0V±10V) can be completed in less than 1.2 seconds;

The special piezoelectric spray printing device for paint in step b includes an X-moving module, a Y-moving module installed on the X-moving module, and a Z-moving module installed on the Y-moving module. The X-direction moving module includes two X-direction drive modules set up in parallel and the corresponding X-direction moving slide table. The Y-direction moving module is set up on two X-direction moving slide tables. The Y-direction moving module The Y-direction moving slide table has a longitudinal installation surface and a transverse installation surface. The Z-direction movement module is installed on the longitudinal installation surface, and a negative pressure paint supply component is installed on the transverse installation surface; the Z-direction A piezoelectric print head is installed on the Z-direction moving slide of the mobile module, and the piezoelectric print head is connected to the negative pressure paint supply assembly. The nozzle of the piezoelectric print head is set downward; the nozzle is The angle between the spray angle and the vertical direction is 5° to 20°; and the spraying environment is a class 10,000 clean room with an ambient temperature of 20°C and a humidity of 65%, and the thickness of the spray paint is set to 16±1μm;

In step d, the UV curing equipment uses UVT controllable UV light source, the fixed baking energy is 400MJ, and the fixed baking time is 10s to ensure that the surface energy is absorbed to 12J/cm ² .

The invention also provides an automated spraying production line for surface coating of plastic hardware products. The automated spraying production line includes an automatic manipulator arranged in the middle, and a loading station, a spraying station, a thermal leveling station and a UV device arranged sequentially around the automatic manipulator. Curing station; including:

The loading station is equipped with a loading positioning fixture, and a workpiece surface cleaning station is also provided on the outside. The workpiece surface cleaning station is equipped with snowflake purification equipment and an ion fan, as well as a transmission belt connected to the loading station;

The spraying station is equipped with a special piezoelectric printing device for paint. The piezoelectric printing device includes an X-moving module, a Y-moving module installed on the X-moving module, and a Y-moving module installed on the X-moving module. The Z-direction moving module on the module. The X-direction moving module includes two X-direction drive modules and corresponding X-direction moving slides installed in parallel. The Y-direction moving module is installed on two X-direction moving slides. On the moving slide, the Y-moving slide of the Y-moving module has a longitudinal mounting surface and a transverse mounting surface. The Z-moving module is installed on the longitudinal mounting surface, and the Z-moving module is installed on the transverse mounting surface. There is a negative pressure paint supply component; a piezoelectric print head is installed on the Z-direction moving slide of the Z-direction moving module, and the piezoelectric print head is connected to the negative pressure paint supply component, and the piezoelectric print head is connected to the negative pressure paint supply component. The nozzle of the head is set downward; the injection angle of the nozzle has an included angle of 5° to 20° with the vertical direction;

The hot leveling station is equipped with a baking oven, a hot air circulation fan and an internal circulation fan. The sprayed workpiece is dried through the baking oven, so that the sprayed paint is initially shaped to form a paint film; the baking oven is used to heat the air circulation fan. And the internal circulation fan can shorten the baking time and improve the efficiency. The internal circulation fan has the environmental protection effect of energy saving and emission reduction;

The UV curing station is equipped with a UV curing machine. The UV curing machine includes a chassis body. An upper partition is provided above the interior of the chassis body and an air inlet chamber is formed above it. An air inlet is provided on the outer wall of the air inlet chamber. A high-efficiency filter is installed in the middle of the upper partition that communicates with the internal working area of the chassis body below; a first ultraviolet lamp and a second ultraviolet lamp are installed at the top of the internal working area of the chassis body and below the upper partition. A main control box and an ultraviolet lamp power driver corresponding to the first ultraviolet lamp and the second ultraviolet lamp are installed at the bottom; the lamp housings of the first ultraviolet lamp and the second ultraviolet lamp are respectively connected with ventilation ducts, and the ventilation ducts and Temperature sensors are respectively provided at the joints of the ultraviolet lamp housings, and the temperature sensors are electrically connected to the thermostat provided on the main control box; the ventilation duct is connected to an exhaust fan installed at the bottom of the chassis body, and the exhaust fan is also connected to the The exhaust pipe outside the main body of the chassis is connected; a rotatable workpiece table is also set up under the internal working area of the main body of the chassis and the first ultraviolet lamp and the second ultraviolet lamp.

Further, in the above-mentioned automated spraying production line: the first ultraviolet lamp and the second ultraviolet lamp are arranged in a vertical state. The main body of the chassis is provided with an openable and closable pneumatic lift door. The main body of the chassis is also provided with an observation window that can see through the interior. There is also a spare air inlet and a spare air inlet valve at the bottom of the chassis body.

According to the product paint spraying method and equipment provided by the present invention, by using a piezoelectric spray printing device to print and spray products, the spraying accuracy can be improved, the problem of non-sprayed surfaces being covered by paint can be avoided, and it is suitable for various regular or irregular products. By spraying, the paint accurately covers the surface of the product, and the paint utilization rate can reach more than 99%, so it can improve production efficiency, save production costs, and reduce emissions and protect the environment.

Picture description:

Figure 1 is a schematic diagram of the overall layout of the production line of the present invention;

Figures 2 and 3 are schematic structural diagrams of the piezoelectric inkjet printing device of the present invention and schematic diagrams of the ejection angles of the nozzles of the print head.

Figures 4-7 are schematic structural diagrams of the curing machine in the present invention.

Detailed ways:

The present invention will be further described below in conjunction with specific embodiments and drawings.

The present invention is a surface coating process for plastic hardware products. As shown in Figure 1, the process of the present invention relies on the production line shown in Figure 1 for implementation. The coating process includes the following steps:

Step a, workpiece surface cleaning and static elimination treatment: clean the workpiece surface through snowflake purification equipment to remove particles and organic pollutants attached to the workpiece surface; at the same time, use ion wind to remove static electricity from the workpiece surface;

Step b: Transfer the workpiece processed in step a to the spraying station through a manipulator, and use a special piezoelectric spray printing device for paint and a manipulator to spray the surface of the workpiece; the spraying operation uses a solid content of 40%-50%. UV paint;

Step c. After the workpiece is sprayed, it is transferred to the hot leveling station through the robot and left to rest. The baking equipment is used to dry and level the surface of the workpiece for 3-5 minutes. The heat leveling temperature is 50℃±5℃, so that the workpiece A smooth paint film layer forms on the surface;

In step d, the workpiece is transferred from the hot leveling station to the UV curing station through a manipulator, and the workpiece is cured and shaped by UV curing equipment;

Step e, finished product inspection.

In the above coating process, the cleaning nozzle diameter of the snowflake purification equipment in step a is 4-8mm, the injection pressure is 4-8Bar, the _CO2 snowflake crystal size produced is 0.3μm-1μm, the cleaning power is 1-2Kw, and the CO liquid loss is Less than 0.8kg/min; the distance between the ion blower and the workpiece surface is 300mm±50mm, the air output is 40-60CFM, the coverage area is 40cm×60cm ² , and the product surface ion balance (0V±10V) can be completed in less than 1.2 seconds;

The spraying environment of the special piezoelectric spray printing device for paint in step b is a class 10,000 clean room, with an ambient temperature of 20°C and a humidity of 65%, and the thickness of the spray paint is set to 16±1 μm;

In step d, the UV curing equipment uses UVT controllable UV light source, the fixed baking energy is 400MJ, and the fixed baking time is 10s to ensure that the surface energy is absorbed to 12J/cm ² .

As shown in Figure 1, there is an automated spraying production line for surface coating of plastic hardware products of the present invention. The automated spraying production line includes an automatic manipulator 10 arranged in the middle, and a loading station 20, a spraying station 30, and Thermal leveling station 40 and UV curing station 50 are arranged in a rectangular shape and distributed around the automatic manipulator 10; among them:

The loading station 20 is provided with a loading positioning fixture 2, and a workpiece surface cleaning station 60 is provided outside the loading station 20. The workpiece surface cleaning station 60 is provided with a snowflake purification device 3 and an ion fan 4, and is connected to the loading station. The conveyor belt 21 of the station 20; the workpiece tray containing the workpiece is first put into the workpiece surface cleaning station 20, and the surface of the workpiece is cleaned through the snowflake purification equipment 3 and the ion blower 4 to remove the pollutants and particles attached to the surface of the workpiece. and remove static electricity;

As shown in FIG. 2 and FIG. 3 , the spraying station 30 is provided with a piezoelectric spray printing device 5 dedicated for paint. The piezoelectric spray printing device 5 includes an X-direction moving module 51 and an X-direction moving module. 51 on the Y-direction movement module 52, and the Z-direction movement module 53 installed on the Y-direction movement module 52, wherein: the X-direction movement module 51 includes two parallel X-direction drive modules 511 and In the corresponding X-direction moving slide table 512, two X-direction driving modules 511 are set up in parallel through four support seats 513; the Y-direction moving module 52 is set up on two X-direction moving slide tables 512, and the Y-direction moving module 512 is set up on two X-direction moving slide tables 512. The Y-direction moving slide table 521 of the group 52 has a longitudinal installation surface 5211 and a transverse installation surface 5212. The Z-direction movement module 53 is installed on the longitudinal installation surface 5211, and a negative bearing is installed on the transverse installation surface 5212. Pressure paint supply assembly 54; a piezoelectric print head 55 is installed on the Z-moving slide 531 of the Z-moving module 53, and the piezoelectric print head 55 is connected to the negative pressure paint supply assembly 54. The negative pressure paint supply assembly 54 is connected to an external paint supply tank, etc., supplies paint to the piezoelectric print head 55, and moves together with the piezoelectric print head 55 in the horizontal direction. The nozzle of the piezoelectric print head 55 faces toward Next settings.

As shown in FIG. 3 , the injection angle of the nozzle 551 of the piezoelectric print head 55 has an included angle of 5° to 20° with the vertical direction. In this way, with the cooperation of the automatic manipulator 1, irregular surfaces such as arc-shaped surfaces or stepped surfaces or drop surfaces can be sprayed with high spraying accuracy and small errors.

The hot leveling station 40 is equipped with a baking oven 6, a hot air circulation fan 7 and an internal circulation fan 8. The sprayed workpiece is dried through the baking oven 6, so that the sprayed paint is initially shaped to form a paint film; baking is used The heating air circulation fan 7 and the internal circulation fan 8 of the furnace 6 can shorten the baking time and improve the efficiency. The internal circulation fan 8 has the environmental protection effect of energy saving and emission reduction;

As shown in Figures 4 to 7, the UV curing station 50 is equipped with a UV curing machine 9. The UV curing machine 9 includes a chassis body 91, and the inner wall of the working area inside the chassis body 91 is installed or coated with reflective material; wherein: An upper partition 911 is provided above the interior of the chassis body 91 and an air inlet chamber 9100 is formed above it. An air inlet 9101 is provided on the outer wall of the air inlet chamber 9100. The middle part of the upper partition 911 is equipped with an air inlet chamber 9100 that works with the interior of the chassis body 91 below. The high-efficiency filter 92 connected in the area; after the air enters the air inlet chamber 9100 from the air inlet 9101, the clean air enters the working area of the curing machine after passing through the high-efficiency filter 92; at the top of the internal working area of the chassis body 91, the upper partition 911 A first ultraviolet lamp 931 and a second ultraviolet lamp 932 are installed below, and a main control box 93 and an ultraviolet lamp power driver 933 corresponding to the first ultraviolet lamp 931 and the second ultraviolet lamp 932 are installed at the inner bottom of the chassis body 91; The lamp shells of the first ultraviolet lamp 931 and the second ultraviolet lamp 932 are respectively connected with ventilation ducts 941, and temperature sensors 934 are respectively provided at the connections between the ventilation ducts 941 and the ultraviolet lamp shells. The temperature sensors 934 are arranged on The thermostat 935 on the main control box 93 is electrically connected, and the thermostat 935 can set the working temperature as needed; the ventilation duct 941 is connected to the exhaust fan 94 installed at the bottom of the chassis body 91 , and the exhaust fan 94 is also connected to the setting The exhaust duct 942 outside the chassis body 91 is connected; the clean cold air entering from the top dissipates heat and controls the temperature of the two ultraviolet lamps above, and the hot air is extracted through the exhaust fan 94 and discharged from the exhaust duct 942 outside the machine; through the thermostat 935 and the temperature sensor 934 can measure the operating temperature of the ultraviolet lamp in real time, thereby adjusting the lamp temperature by controlling the air volume and wind speed of the exhaust fan 94 as needed to achieve automatic control, stabilize the operating temperature of the ultraviolet lamp, and obtain better curing effects; A rotatable workpiece table 95 is also set up below the internal working area of the chassis body 91, the first ultraviolet lamp 931, and the second ultraviolet lamp 932; during operation, the workpiece is placed on the rotatable workpiece table 95, and is placed on the rotatable workpiece table 95. It rotates under the driving force and solidifies under dynamic conditions, thereby making the curing time and effect more uniform throughout the workpiece and ensuring product quality;

Further, the first ultraviolet lamp 931 and the second ultraviolet lamp 932 are arranged in a vertical state, that is, one is arranged along the length direction and the other is arranged along the width direction. They are equipped with a dynamic rotatable workpiece table 95 below, as well as reflective lights in the working area. The inner wall allows the workpiece to receive even light throughout, achieves uniform curing, and can meet different workpiece processing needs.

Furthermore, the main body 91 of the chassis is provided with an openable and closable pneumatic lift door 912. The pneumatic lift door 912 is opened to place and take out workpieces, and the pneumatic lift door 912 is closed during operation.

Further, the main body 91 of the chassis is also provided with an observation window 913 that can see through the interior, so that the solidification condition of the internal workpiece can be observed when necessary;

Furthermore, a backup air inlet and a backup air inlet valve 914 are provided at the bottom of the chassis body 91, which can be opened when needed to inject air from below to adjust the ambient temperature of the workpiece. They can also be opened when the machine is shut down to quickly cool down the interior and protect the workpiece. equipment. A hole plate 915 is provided between the internal working area and the bottom area of the chassis body 91 .

In the present invention, in the spray printing process, the graphics required for printing can be preset in the spray paint printer first, a robot is used to place the product into the printing station of the spray paint printer device, and the printing program of the spray paint printer is debugged. The spray ink pattern is used to print and spray paint on the product through the nozzle of the spray paint printer; the robot can be used for program coordination, so that every surface of the 3D product can be evenly printed and sprayed with paint. The spray printing process of the present invention can realize high-drop coating. For arc-shaped surfaces, it can achieve 25mm drop coating. For right-angle isotropic surfaces, it can assist flexible robots to adjust the product to complete surface coating. The drop can reach 50mm; and the paint The flying speed of droplets is high, reaching 10~12m/s, and the spray positioning is accurate. The printing angle error is as small as 1.3mrad, which is equivalent to the sprayed paint droplets landing on a 10cm bullseye 50 meters away. The small spraying error greatly ensures Accuracy of placement of paint droplets.

In the present invention, the overall structural layout of the UV curing machine is reasonable. The working temperature of the ultraviolet lamp can be measured in real time through the thermostat and temperature sensor, so that the lamp temperature can be adjusted as needed by controlling the air volume and wind speed of the exhaust fan to achieve automatic control, thereby making the ultraviolet lamp The working temperature of the lamp is stable, achieving better curing effect, and is suitable for the processing needs of spray curing of workpieces of various specifications and sizes.

In summary, according to the product paint spraying method provided by the present invention, by using a piezoelectric spray printing device to print and spray products, the spraying accuracy can be improved, the problem of non-sprayed surfaces being covered by paint can be avoided, and it is suitable for various rules or When spraying irregular products, the paint is accurately covered on the product surface, and the paint utilization rate can reach more than 99%. Therefore, it can improve production efficiency, save production costs, and reduce emissions and protect the environment.

Claims (7)

1. A plastic hardware product surface coating process is characterized in that: the coating process comprises the following steps:

step a, cleaning and static electricity removing treatment of the surface of a workpiece: cleaning the surface of a workpiece through snowflake purifying equipment to remove particles and organic pollutants attached to the surface of the workpiece; meanwhile, removing static electricity on the surface of the workpiece by utilizing ion wind;

b, transferring the workpiece treated in the step a to a spraying station through a manipulator, and spraying the surface of the workpiece by utilizing a piezoelectric type spraying device special for paint and the cooperation of the manipulator; the spraying operation adopts UV paint with the solid content of 40-50 percent;

c, transferring the workpiece to a hot leveling station for standing through a manipulator after the spraying of the workpiece is finished, and drying and leveling the surface of the workpiece by using baking equipment for 3-5min, wherein the hot leveling temperature is 50+/-5 ℃ so as to form a smooth paint film layer on the surface of the workpiece;

step d, transferring the workpiece from the hot leveling station to a UV curing station through a manipulator, and curing and shaping the workpiece through UV curing equipment;

and e, detecting a finished product.

2. The plastic hardware product surface coating process according to claim 1, wherein:

the caliber of a cleaning nozzle of the snow purifying device in the step a is 4-8mm, the spraying pressure is 4-8Bar, and CO is generated ₂ The size of snowflake crystal is 0.3 μm-1 μm, the cleaning power is 1-2Kw, and the CO liquid loss is less than 0.8kg/min; the distance between the ion fan and the surface of the workpiece is 300mm plus or minus 50mm, the air output is 40-60CFM, and the coverage area is 40cm multiplied by 60cm ² The ion balance (0 V+/-10V) of the surface of the product can be completed in less than 1.2 seconds;

the special piezoelectric spray printing device for the paint in the step b comprises an X-direction moving module, a Y-direction moving module arranged on the X-direction moving module and a Z-direction moving module arranged on the Y-direction moving module, wherein the X-direction moving module comprises two X-direction driving modules which are arranged in parallel and corresponding X-direction moving sliding tables, the Y-direction moving module is arranged on the two X-direction moving sliding tables, the Y-direction moving sliding table of the Y-direction moving module is provided with a longitudinal mounting surface and a transverse mounting surface, the Z-direction moving module is arranged on the longitudinal mounting surface, and a negative pressure paint supply assembly is arranged on the transverse mounting surface; the Z-direction moving sliding table of the Z-direction moving module is provided with a piezoelectric type spray printing head, the piezoelectric type spray printing head is connected with the negative pressure paint supply assembly, and the nozzle of the piezoelectric type spray printing head is arranged downwards; the injection angle of the nozzle has an included angle of 5-20 degrees with the vertical direction; the spraying environment is a ten-thousand-level clean room, the ambient temperature is 20 ℃, the humidity is 65%, and the thickness of the spray printing paint is set to be 16+/-1 mu m;

in the step d, the UV curing equipment adopts a UVT controllable UV light source, the curing energy is 400MJ, and the curing time is 10s, so as to ensure that the surface energy is absorbed to 12J/cm ² 。

3. The utility model provides an automatic spraying production line of plastic hardware product surface coating which characterized in that: the automatic spraying production line comprises an automatic manipulator arranged in the middle, and a feeding station, a spraying station, a hot leveling station and a UV curing station which are sequentially arranged around the automatic manipulator; wherein the method comprises the steps of

The feeding station is provided with a feeding positioning jig, the outer side of the feeding station is also provided with a workpiece surface cleaning station, and the workpiece surface cleaning station is internally provided with snowflake purifying equipment and an ion fan, and a conveying belt connected with the feeding station;

the special piezoelectric spray printing device for paint is arranged in the spraying station and comprises an X-direction moving module, a Y-direction moving module arranged on the X-direction moving module and a Z-direction moving module arranged on the Y-direction moving module, wherein the X-direction moving module comprises two X-direction driving modules which are arranged in parallel and corresponding X-direction moving sliding tables, the Y-direction moving module is arranged on the two X-direction moving sliding tables, the Y-direction moving sliding table of the Y-direction moving module is provided with a longitudinal mounting surface and a transverse mounting surface, the Z-direction moving module is arranged on the longitudinal mounting surface, and a negative pressure paint supply assembly is arranged on the transverse mounting surface; the Z-direction moving sliding table of the Z-direction moving module is provided with a piezoelectric type spray printing head, the piezoelectric type spray printing head is connected with the negative pressure paint supply assembly, and the nozzle of the piezoelectric type spray printing head is arranged downwards;

the injection angle of the nozzle has an included angle of 5-20 degrees with the vertical direction;

the hot leveling station is provided with a baking furnace, a hot air circulating fan and an internal circulating fan;

the UV curing station is provided with a UV curing machine, the UV curing machine comprises a case main body, an upper partition plate is arranged above the inside of the case main body and forms an air inlet chamber above the inside of the case main body, an air inlet is arranged on the outer wall of the air inlet chamber, and a high-efficiency filter communicated with the working area inside the case main body below is arranged in the middle of the upper partition plate; a first ultraviolet lamp and a second ultraviolet lamp are arranged at the top of an inner working area of the case main body and below the upper partition plate, and a main control box and an ultraviolet lamp power driver corresponding to the first ultraviolet lamp and the second ultraviolet lamp are arranged at the inner bottom of the case main body; the lamp housings of the first ultraviolet lamp and the second ultraviolet lamp are respectively connected with a ventilating duct, and temperature sensors are respectively arranged at the joints of the ventilating ducts and the lamp housings of the ultraviolet lamps and are electrically connected with a temperature controller arranged on the main control box; the ventilating duct is connected with an exhaust fan arranged at the bottom in the case main body, and the exhaust fan is also communicated with an exhaust pipe arranged outside the case main body; rotatable workpiece tables are also arranged below the inner working area of the case main body, the first ultraviolet lamp and the second ultraviolet lamp.

4. The automated spraying production line for surface coating of plastic hardware product according to claim 3, wherein: the first ultraviolet lamp and the second ultraviolet lamp are arranged in a vertical state.

5. The automated spraying production line for surface coating of plastic hardware product according to claim 3, wherein: the case body is provided with a pneumatic lifting door which can be opened and closed.

6. The automated spraying production line for surface coating of plastic hardware product according to claim 3, wherein: the case main body is also provided with an observation window capable of perspective the inside.

7. The automated spraying production line for surface coating of plastic hardware product according to claim 3, wherein: the bottom of the case main body is also provided with a standby air inlet and a standby air inlet valve.