A paint spraying system with paint recycling and gas purification functions

Abstract

The application discloses a paint spraying system with paint recycling and gas purification functions, which comprises a hanging conveying line used for conveying workpieces, a plurality of clamps used for clamping the workpieces and moving along the hanging conveying line, a paint spraying section of the hanging conveying line, paint spraying heads used for spraying paint to the workpieces at the paint spraying section, a paint collecting assembly used for collecting excess paint at the paint spraying section, a water curtain assembly used for preventing the waste gas of the paint spraying from spreading outward around the paint spraying section, and a three-phase separator, wherein the paint collected by the paint collecting assembly and the waste water of the water curtain assembly are collected into the three-phase separator, an exhaust port of the three-phase separator is connected with a VOCs catalytic assembly, a centrifugal fan used for sucking clean air outward is arranged at an exhaust port of the VOCs catalytic assembly, the paint collecting assembly comprises a funnel-shaped flow guide arranged below the paint spraying section, an air suction assembly used for sucking air is arranged at the flow guide, and an exhaust port of the air suction assembly is also communicated with the VOCs catalytic assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to a paint spraying system, in particular to a paint spraying system with paint recycling and gas purification functions. BACKGROUND

[0002] In order to ensure the efficiency and quality of paint spraying, the common paint spraying system often adopts a large area of paint spraying to form a paint spraying area on the production line, so that the workpiece on the production line can complete the paint spraying operation as long as it passes through the paint spraying area. However, this kind of paint spraying system needs to spray paint in a large area, and the paint loss in the paint spraying process can be as high as 60%, which will greatly increase the production cost of the enterprise. In addition, the paint sprayed in the air will produce VOCs waste gas after contacting with the air, which will seriously affect the air quality of the production environment. At present, the method of enterprises to solve the above problems is to build an independent paint spraying room in the paint spraying area, and to build a gas centralized treatment system in the paint spraying room to treat VOCs waste gas, but this needs to be planned and constructed at the beginning of the production line, and it is difficult to build a gas centralized treatment system through later modification, and the cost of building a gas centralized treatment system also makes many enterprises hesitate. In recent years, with the deepening of the concept of sustainable development, how to carry out green production and low-carbon production has become the top priority of enterprise development.

[0003] Therefore, how to overcome the defects of the above-mentioned paint spraying system in a more green and low-carbon way has become an important topic for technicians in the field to solve. SUMMARY

[0004] The present application overcomes the shortcomings of the above-mentioned technology and provides a paint spraying system with paint recycling and gas purification functions.

[0005] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0006] The paint spraying system with paint recycling and gas purification function comprises a hanging conveying line 1 for conveying workpieces, a plurality of clamps 2 for clamping the workpieces are arranged on the hanging conveying line 1 and move along the hanging conveying line 1, a paint spraying section 11 is arranged on the hanging conveying line 1, a paint spraying head 3 for spraying paint on the workpieces is arranged at the paint spraying section 11, a paint collecting assembly 4 for collecting excess paint is arranged at the paint spraying section 11, a water curtain assembly 5 for preventing the waste gas of the paint spraying from spreading outward is further arranged on the periphery of the paint spraying section 11, and the paint spraying system further comprises a three-phase separator 6, the paint collected by the paint collecting assembly 4 and the waste water of the water curtain assembly 5 are collected into the three-phase separator 6, a VOCs catalytic assembly 7 is connected to the exhaust port of the three-phase separator 6, a centrifugal fan 8 for sucking clean air outward is arranged at the exhaust port of the VOCs catalytic assembly 7, the paint collecting assembly 4 comprises a funnel-shaped flow guide 41 arranged below the paint spraying section 11, an air suction assembly 9 for sucking gas is arranged at the flow guide 41, and the exhaust port of the air suction assembly 9 is also communicated with the VOCs catalytic assembly 7.

[0007] Preferably, the paint collecting assembly 4 comprises a paint baffle 42 arranged on the periphery of the paint spraying section 11 for blocking the paint from splashing outward, the flow guide 41 is arranged below the paint baffle 42 for collecting the paint flowing down from the paint baffle 42, a paint collecting groove 43 for collecting the paint is arranged below the flow guide 41, and the paint collecting groove 43 is communicated with the inlet of the three-phase separator 6 so as to make the paint flow into the three-phase separator 6.

[0008] Preferably, the surface of the paint baffle 42 is provided with a paint-repellent coating.

[0009] Preferably, the water curtain assembly 5 comprises a water curtain spray pipe 51 arranged above the paint spraying section 11 and surrounding the paint spraying section 11, the water curtain spray pipe 51 is used for spraying water downward to form a water curtain, a water curtain recovery groove 52 for receiving the water flow of the water curtain is arranged below the water curtain spray pipe 51, and the water curtain recovery groove 52 is communicated with the inlet of the three-phase separator 6 so as to make the water flow into the three-phase separator 6.

[0010] Preferably, the water curtain spray pipe 51 has two inner and outer distribution pipes so as to form a double-layer water curtain.

[0011] Preferably, activated carbon is added to the water sprayed by the water curtain spray pipe 51 so as to adsorb VOCs.

[0012] Preferably, the VOCs catalytic assembly 7 comprises an air inlet filter box 71 communicated with the exhaust port of the three-phase separator 6 and the exhaust port of the air suction assembly 9, an air catalytic box 72 for catalytically degrading VOCs is connected to the air outlet of the air inlet filter box 71, and the air outlet of the air catalytic box 72 is connected with the centrifugal fan 8 so as to make the clean air subjected to catalytic treatment discharged outward.

[0013] Preferably, nitrogen-doped graphene catalytic material is placed in the catalytic box 72 to facilitate catalytic degradation of VOCs at room temperature.

[0014] Preferably, the air suction assembly 9 comprises an air suction pipe 91 connecting the flow guide 41 with the VOCs catalytic assembly 7, and a baffle 92 is arranged at the connecting opening of the flow guide 41 and the air suction pipe 91 to shield the connecting opening of the air suction pipe 91, and the baffle 92 and the wall of the flow guide 41 jointly form an air inlet space 93 with an opening downward.

[0015] Preferably, the air suction assembly 9 further comprises a paint filtering box 94 arranged between the air suction pipe 91 and the VOCs catalytic assembly 7.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The paint spraying system of the present application can process the wasted paint and the randomly diffused VOCs gas on the production line through the cooperation of the paint collection assembly, the water curtain assembly, the three-phase separator, the VOCs catalytic assembly and the air suction assembly, so as to realize paint recycling and gas purification. Compared with the prior art of setting a paint spraying room and a centralized processing system, the paint spraying system of the present application has a simple structure and low deployment cost, and can complete paint recycling and gas purification with a small investment, and has low maintenance difficulty. The use of the paint spraying system of the present application can greatly reduce paint loss and VOCs pollution.

[0018] 2. By implementing the paint spraying system of the present application, the problems of paint recycling and gas purification can be solved with a low investment, which not only realizes green production and low-carbon production in the final result, but also reduces resource consumption in the early deployment stage, so that the paint spraying system can also realize the concept of sustainable development of green and low carbon in the deployment stage. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is one of the schematic diagrams of the paint spraying system of the present application.

[0020] Figure 2 is another schematic diagram of the paint spraying system of the present application.

[0021] Figure 3 is a schematic diagram of the paint collection assembly of the present application.

[0022] Figure 4 is a schematic diagram of the baffle of the present application. DETAILED DESCRIPTION

[0023] The features of the present application and other related features are further described in detail below through examples for the understanding of technicians in the same industry:

[0024] like Figures 1 to 4 As shown, a painting system with paint recovery and gas purification functions includes a suspended conveyor line 1 for transporting workpieces. The suspended conveyor line 1 is equipped with several clamps 2 that move along the line to hold the workpieces. The suspended conveyor line 1 has a painting section 11, where spray nozzles 3 are provided for spraying paint onto the workpieces. A paint collection assembly 4 is also provided at the painting section 11 to collect excess paint. A water curtain assembly 5 is also provided around the painting section 11 to prevent the paint exhaust gas from spreading outwards. The painting system also includes a three-phase... The paint and wastewater from the water curtain assembly 5 collected by the paint collection assembly 4 are gathered in the three-phase separator 6. The exhaust port of the three-phase separator 6 is connected to the VOCs catalytic assembly 7. The exhaust port of the VOCs catalytic assembly 7 is equipped with a centrifugal fan 8 for drawing clean air outward. The paint collection assembly 4 includes a funnel-shaped guide 41 located below the paint spraying section 11. The guide 41 is equipped with an air intake assembly 9 for drawing in gas. The exhaust port of the air intake assembly 9 is also connected to the VOCs catalytic assembly 7.

[0025] The painting system in this case has a painting section 11 on the suspended conveyor line 1, with a nozzle 3 positioned at the center of the painting section 11. When the fixture 2 moves along the suspended conveyor line 1 to the painting section 11, paint can be sprayed onto the workpiece fixed to the fixture 2 through the nozzle 3, thus completing the painting operation. Simultaneously, the painting system also includes a paint collection component 4 and a water curtain component 5. The paint collection component 4 can collect paint that is not adhering to the workpiece, while the water curtain component 5 sprays water downwards from the periphery of the painting section 11, forming a water curtain that surrounds the painting section 11. This water curtain prevents VOCs from easily diffusing into the production environment. In addition, the paint collected by the paint collection component 4 and the water curtain wastewater that intercepts VOCs will eventually converge in the three-phase separator 6. After separation by the three-phase separator 6, the paint will be discharged from the oil outlet of the three-phase separator 6 for recycling, while the waste gas containing VOCs will be discharged from the exhaust outlet of the three-phase separator 6 and enter the VOCs catalytic component 7. The remaining water, which does not contain paint or VOCs, will be discharged from the drain outlet of the three-phase separator 6. Furthermore, an air intake component 9 is provided on the flow guide 41 to directly draw in the VOCs waste gas from the painting section 11 and transport it to the VOCs catalytic component 7, thereby directing the airflow from the painting section 11 toward the air intake component 9 to prevent the gas from spreading randomly. The VOCs waste gas drawn into the VOCs catalytic component 7 will be treated by the VOCs catalytic component 7 to form non-toxic and harmless air before being discharged again, thus preventing VOCs from polluting the production environment.

[0026] As described above, the paint spraying system of the present case can treat the wasted paint and the VOCs gas diffused at will on the production line through the cooperation of the paint collection assembly 4, the water curtain assembly 5, the three-phase separator 6, the VOCs catalytic assembly 7 and the air suction assembly 9, so as to realize the paint recycling and gas purification. Compared with the existing solution of setting a paint spraying room and a centralized treatment system, the paint spraying system of the present case has a simple structure and low deployment cost, and can complete the paint recycling and gas purification with a small investment, and has low maintenance difficulty. By using the paint spraying system of the present case, the paint loss can be greatly reduced and the VOCs pollution can be reduced.

[0027] In addition, by implementing the paint spraying system of the present case, the problems of paint recycling and gas purification can be solved with a low investment. Not only the green production and low-carbon production can be realized in the final result, but also the resource consumption can be reduced in the early stage of deployment, so that the paint spraying system can also realize the concept of sustainable development of green and low carbon in the deployment.

[0028] As shown in Figures 1 to 3 Preferably, the paint collection assembly 4 includes a paint baffle 42 arranged outside the paint spraying section 11 for blocking the paint from splashing outward, the flow guide 41 is arranged below the paint baffle 42 for collecting the paint flowing down from the paint baffle 42, and the paint collection groove 43 for collecting the paint is arranged below the flow guide 41, and the paint collection groove 43 is in communication with the inlet of the three-phase separator 6 so as to facilitate the paint flowing into the three-phase separator 6.

[0029] As described above, the paint collection assembly 4 of the present case is provided with a paint baffle 42 outside the paint spraying section 11. Thus, the paint sprayed from the spray head 3 but not attached to the workpiece will finally fall on the surface of the paint baffle 42. The paint falling on the paint baffle 42 will slide down under the action of gravity and fall into the flow guide 41. The paint collection groove 43 aligned with the opening below the flow guide 41 is arranged below the flow guide 41. Thus, the paint not attached to the workpiece in the paint spraying section 11 will fall into the paint collection groove 43, and the paint in the paint collection groove 43 will finally enter the three-phase separator 6 for oil-gas-water separation, so that the unused paint can be recycled.

[0030] As shown in Figures 1 to 3 Preferably, the surface of the paint baffle 42 is provided with an oil-repellent coating. In this way, the paint remaining on the surface of the paint baffle 42 can be avoided to be difficult to be recycled.

[0031] As shown in Figures 1 to 3As shown, preferably, the water curtain assembly 5 includes a water curtain spray pipe 51 disposed above and surrounding the paint spray section 11. The water curtain spray pipe 51 is used to spray water downward to form a water curtain. A water curtain recovery tank 52 is provided below the water curtain spray pipe 51 to receive the water flow from the water curtain. The water curtain recovery tank 52 is connected to the inlet of the three-phase separator 6 so that the water flow can flow into the three-phase separator 6.

[0032] As described above, by setting up the water curtain spray pipe 51, a water curtain can be formed around the paint spraying section 11 to intercept the outward diffusion of VOCs exhaust gas. A water curtain recovery tank 52 is set below the water curtain spray pipe 51 to receive the water flow from the water curtain and prevent the water flow from splashing randomly on the production site.

[0033] like Figures 1 to 3 As shown, preferably, the water curtain spray pipe 51 has two pipes distributed inside and outside to form a double-layer water curtain, so that VOCs gas can be effectively intercepted through the double-layer water curtain.

[0034] Preferably, the water curtain spray pipe 51 is fixed to the ceiling, or a sealing cover is provided above the water curtain spray pipe 51, so as to prevent VOCs exhaust gas from passing through the water curtain from above and spreading outward.

[0035] Preferably, the nozzle 3 is also suspended from the ceiling.

[0036] like Figures 1 to 3 As shown, preferably, activated carbon is added to the water sprayed from the water curtain spray pipe 51 to facilitate the adsorption of VOCs.

[0037] like Figures 1 to 3 As shown, preferably, the VOCs catalytic component 7 includes an intake filter box 71 that is connected to both the exhaust port of the three-phase separator 6 and the exhaust port of the intake component 9. The outlet of the intake filter box 71 is connected to a catalytic box 72 for catalytic degradation of VOCs. The outlet of the catalytic box 72 is connected to the centrifugal fan 8 to discharge the catalytically treated clean air to the outside.

[0038] As described above, the gas entering the VOCs catalytic converter 7 first passes through the intake filter box 71 to further filter out moisture and paint, ensuring that only VOCs waste gas enters the catalytic converter 72. This prevents moisture and paint from entering the catalytic converter 72 and affecting its catalytic effect. The VOCs waste gas entering the catalytic converter 72 is then converted into harmless air and discharged again under the catalytic degradation action of the catalytic converter 72.

[0039] like Figures 1 to 3As shown, preferably, the catalytic chamber 72 contains nitrogen-doped graphene catalytic material to facilitate the catalytic degradation of VOCs at room temperature. Thus, the nitrogen-doped graphene catalytic material can be used to catalytically degrade VOCs, transforming VOCs waste gas into harmless air. This nitrogen-doped graphene catalytic material is identical to the nitrogen-doped graphene catalytic material disclosed in Chinese invention patent application publication number CN116532144 A, entitled "A Nitrogen-Doped Graphene Catalytic Material and Its Preparation Method and Application," and will not be described in detail here.

[0040] like Figures 1 to 4 As shown, preferably, the intake assembly 9 includes an intake pipe 91 that connects the guide member 41 to the VOCs catalytic assembly 7. The connection opening between the guide member 41 and the intake pipe 91 is provided with a baffle 92 for blocking the connection opening of the intake pipe 91. The baffle 92 and the wall of the guide member 41 together form a downward-facing intake space 93.

[0041] As described above, the VOCs exhaust gas from the painting section 11 can be drawn into the VOCs catalytic component 7 for catalytic treatment by the centrifugal fan 8 through the intake pipe 91, which is guided by the guide component 41 and the VOCs catalytic component 7. In order to prevent the paint from being drawn into the intake pipe 91 as well, the guide component 41 is also provided with a baffle 92 for blocking the intake pipe 91. The baffle 92 and the guide component 41 can form an air intake space 93 with the opening facing downward. In this way, the paint falling from the top cannot enter the air intake space 93, thus preventing the paint from being drawn into the intake pipe 91. The VOCs exhaust gas can be drawn into the air intake space 93 from the bottom up and then into the intake pipe 91.

[0042] like Figures 1 to 4 As shown, preferably, the intake assembly 9 further includes a paint filter box 94 disposed between the intake pipe 91 and the VOCs catalytic assembly 7, so that the paint filter box 94 can further ensure that no paint is drawn into the VOCs catalytic assembly 7.

[0043] Preferably, the spraying section 11 has an arc shape, the spray nozzle 3 is located at the center of the spraying section 11, and the clamp 2 rotates synchronously while moving along the suspended conveyor line 1. In this way, the workpiece moves along the arc in the spraying section 11 and rotates synchronously, thus ensuring the uniformity of the paint spraying.

[0044] As stated above, this case protects a paint spraying system with paint recovery and gas purification functions, and all technical solutions that are the same as or similar to this case should be considered to fall within the scope of protection of this case.

Claims

1. A spray painting system with paint recovery and gas purification functions, characterized in that... The system includes a suspended conveyor line (1) for transporting workpieces, with several clamps (2) on the suspended conveyor line (1) that move along the suspended conveyor line (1) to hold the workpieces. The suspended conveyor line (1) has a painting section (11), with a spray nozzle (3) for spraying paint onto the workpieces at the painting section (11). The painting section (11) also has a paint collection assembly (4) for collecting excess paint. The painting section (11) is surrounded by a water curtain assembly (5) to prevent the paint exhaust gas from spreading outwards. The painting system also includes a three-phase separator (6). The paint collection assembly... Wastewater from paint and water curtain assembly (5) collected by component (4) is collected in three-phase separator (6). The exhaust port of the three-phase separator (6) is connected to VOCs catalytic assembly (7). The exhaust port of the VOCs catalytic assembly (7) is provided with centrifugal fan (8) for drawing clean air outward. The paint collection assembly (4) includes a funnel-shaped guide (41) set below the paint spraying section (11). The guide (41) is provided with a gas intake assembly (9) for intake gas. The exhaust port of the gas intake assembly (9) is also connected to the VOCs catalytic assembly (7). The paint collection assembly (4) includes a paint baffle (42) disposed around the paint spraying section (11) to prevent paint from splashing outwards. The guide (41) is disposed below the paint baffle (42) to collect the paint flowing down from the paint baffle (42). A paint collection trough (43) for collecting paint is provided below the guide (41). The paint collection trough (43) is connected to the inlet of the three-phase separator (6) so that the paint can flow into the three-phase separator (6).

2. A spray painting system with paint recovery and gas purification functions according to claim 1, characterized in that... The paint baffle (42) has an oleophobic coating on its surface.

3. A spray painting system with paint recovery and gas purification functions according to claim 1, characterized in that... The water curtain assembly (5) includes a water curtain spray pipe (51) disposed above and surrounding the paint spray section (11). The water curtain spray pipe (51) is used to spray water downward to form a water curtain. A water curtain recovery tank (52) is provided below the water curtain spray pipe (51) for receiving the water flow from the water curtain. The water curtain recovery tank (52) is connected to the inlet of the three-phase separator (6) so that the water flow can flow into the three-phase separator (6).

4. A spray painting system with paint recovery and gas purification functions according to claim 3, characterized in that... The water curtain spray pipe (51) has two pipes distributed inside and outside to form a double-layer water curtain.

5. A spray painting system with paint recovery and gas purification functions according to claim 3, characterized in that... Activated carbon is added to the water sprayed from the water curtain spray pipe (51) to facilitate the adsorption of VOCs.

6. A spray painting system with paint recovery and gas purification functions according to claim 1, characterized in that... The VOCs catalytic assembly (7) includes an intake filter box (71) that is connected to the exhaust port of the three-phase separator (6) and the exhaust port of the intake assembly (9). The outlet of the intake filter box (71) is connected to a catalytic box (72) for catalytic degradation of VOCs. The outlet of the catalytic box (72) is connected to the centrifugal fan (8) to discharge the catalytically treated clean air to the outside.

7. A spray painting system with paint recovery and gas purification functions according to claim 6, characterized in that... The catalyst box (72) contains nitrogen-doped graphene catalyst material to facilitate the catalytic degradation of VOCs at room temperature.

8. A spray painting system with paint recovery and gas purification functions according to claim 1, characterized in that... The intake assembly (9) includes an intake pipe (91) that connects the guide member (41) and the VOCs catalytic assembly (7). The connection opening of the guide member (41) and the intake pipe (91) is provided with a baffle (92) for blocking the connection opening of the intake pipe (91). The baffle (92) and the wall of the guide member (41) together form an intake space (93) with the opening facing downward.

9. A spray painting system with paint recovery and gas purification functions according to claim 8, characterized in that... The intake assembly (9) also includes a paint filter box (94) disposed between the intake pipe (91) and the VOCs catalytic assembly (7).

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