Paint spraying line waste gas and water circulation treatment system

Abstract

The paint spraying line waste gas and water circulation treatment system comprises a waste gas treatment unit and a water treatment unit, the waste gas treatment unit and a paint spraying room are combined to form a gas circulation structure, the waste gas treatment unit comprises a pretreatment device and a spraying device, and the spraying device and the water treatment unit form a water circulation structure. The gas circulation structure can remove paint mist in the paint spray booth and enable most filtered gas to be put into use again, and the water circulation structure can purify water in the water collecting pipe and convey the purified water to the spraying mechanism for spraying operation. The system can reduce the discharge amount of waste gas and waste water, reduce the follow-up treatment pressure of waste gas and waste water, and meanwhile, the waste gas and waste water are reused after being purified, so that the energy consumption is reduced, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of paint spraying technology, and in particular to a waste gas and water recycling system for a paint spraying line. Background Technology

[0002] Currently, most automotive parts are painted in a paint booth. During the painting process, paint that does not adhere to the parts floats in the air of the paint booth, forming paint mist. Therefore, it is necessary to continuously supply fresh air to the work area in the paint booth and use an exhaust system to remove the paint mist.

[0003] Currently, most spray booths are equipped with paint mist capture devices, with the water curtain Venturi type being the most common. The collected paint mist is directly sent to the exhaust gas treatment system and then directly discharged into the air, resulting in a 100% exhaust emission rate. Although the exhaust gas meets emission standards after treatment, it still has a certain impact on the environment. Utility Model Content

[0004] This invention provides a waste gas and water recycling system for a paint spraying line, which can capture, treat and recycle paint mist from the spray booth, and filter and recycle the wastewater generated during the treatment process.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A paint spraying line exhaust gas and water circulation treatment system includes an exhaust gas treatment unit and a water treatment unit. The exhaust gas treatment unit includes a pretreatment device and a spraying device arranged sequentially along the exhaust gas flow direction. One end of the pretreatment device has an air inlet and is connected to the outlet section of the paint booth through an air inlet pipe. The other end is connected to the inlet end of the spraying device through an air supply pipe. A medium-efficiency filter group is provided inside the pretreatment device and near the air inlet. The outlet end of the spraying device is connected to the inlet section of the paint booth through an air outlet pipe. An exhaust fan is provided on the air outlet pipe. The spraying device has an airflow channel that communicates with the air supply pipe and the air outlet pipe. A spraying mechanism is provided at the top of the spraying device, and a water collection pipe is provided at the bottom of the spraying device. The water treatment unit is arranged between the spraying mechanism and the water collection pipe to form a water circulation structure.

[0007] Furthermore, the spraying mechanism includes a drainage pipe, which is horizontally arranged above the spraying device. Multiple atomizing nozzles are arranged at the bottom of the drainage pipe, and the atomizing nozzles are located inside the spraying device, with the spraying direction of the atomizing nozzles facing the airflow channel.

[0008] Furthermore, the water collection pipe is horizontally arranged at the bottom of the spray device, and multiple water collection ports are provided on the water collection pipe. Preferably, the water collection ports are funnel-shaped.

[0009] Furthermore, the water treatment unit includes a stirring chamber and a filtration chamber, with the stirring chamber located above the filtration chamber; a stirring assembly is provided inside the stirring chamber, and a drive motor is provided at the top of the stirring chamber; the stirring assembly is electrically connected to the drive motor; and a filter screen is provided inside the filtration chamber.

[0010] Furthermore, the top of the stirring chamber is provided with a water outlet, which is connected to the drainage pipe through a water outlet pipe, and the bottom of the stirring chamber is provided with a sewage outlet; the bottom of the filtering chamber is provided with a water inlet, which is connected to the water collection pipe through a water inlet pipe, and a water circulation pump is provided on the water inlet pipe, and the filter screen is located above the water inlet.

[0011] Furthermore, an electric drain valve is provided at the drain outlet.

[0012] Furthermore, the medium-efficiency filter group includes multiple vertically arranged medium-efficiency filters.

[0013] Compared with the prior art, the present invention has the following advantages or beneficial effects:

[0014] This application provides a waste gas and water circulation treatment system for a paint spraying line. The waste gas treatment unit and the paint booth are combined to form a gas circulation structure, while the spraying device in the waste gas treatment unit and the water treatment unit form a water circulation structure. The gas circulation structure removes paint mist from the paint booth and allows most of the filtered gas to be reused. The water circulation structure purifies the water in the collection pipe and transports the purified water to the spraying mechanism for spraying operations. This system reduces the emission of waste gas and wastewater, reduces the pressure on subsequent waste gas and wastewater treatment, and allows for the purification and reuse of waste gas and wastewater, thereby reducing energy consumption and lowering production costs. Attached Figure Description

[0015] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0016] Figure 1 This is a schematic diagram of the exhaust gas and water circulation treatment system for the paint spraying line provided in this embodiment.

[0017] In the diagram, 1 is the exhaust gas treatment unit, 2 is the water treatment unit, 21 is the mixing chamber, 211 is the mixing assembly, 212 is the drive motor, 213 is the drain outlet, 22 is the filter chamber, 221 is the filter screen, 3 is the pretreatment device, 31 is the medium-efficiency filter group, 4 is the spray device, 41 is the water collection pipe, 411 is the water collection port, 42 is the drain pipe, 43 is the atomizing nozzle, 5 is the air inlet pipe, 6 is the gas transmission pipe, 7 is the air outlet pipe, 8 is the exhaust fan, 9 is the water circulation pump, and 10 is the water inlet pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without inventive effort are within the protection scope of the present utility model.

[0019] Please refer to the attached document. Figure 1 This utility model provides a waste gas and water circulation treatment system for a paint spraying line, including: a waste gas treatment unit 1 and a water treatment unit 2; the waste gas treatment unit 1 includes a pretreatment device 3 and a spraying device 4 arranged sequentially along the waste gas flow direction. One end of the pretreatment device 3 is provided with an air inlet and is connected to the outlet section of the paint booth through an air inlet pipe 5, and the other end is connected to the inlet end of the spraying device 4 through an air supply pipe 6. The waste gas treatment unit 1 and the paint booth are combined to form a gas circulation structure, which can remove paint mist in the paint booth and allow most of the filtered gas to be reused. A medium-efficiency filter group 31 is provided in the pretreatment device 3 near the air inlet. The medium-efficiency filter group 31 includes three vertically arranged medium-efficiency filters. The multi-filtration structure can achieve a primary filtration effect of 85-95%. The outlet end of the spraying device 4 is connected to the inlet section of the paint booth through an air outlet pipe 7. An exhaust fan 8 is provided on the air outlet pipe 7, which is used to transport the purified gas back into the paint booth. The spray device 4 has an airflow channel that is connected to the air supply pipe 6 and the air outlet pipe 7. The top of the spray device 4 is equipped with a spray mechanism, and the bottom of the spray device 4 is equipped with a water collection pipe 41. A water treatment unit 2 is set between the spray mechanism and the water collection pipe 41 to form a water circulation structure, which purifies the water in the water collection pipe 41 and transports the purified water to the spray mechanism for spraying.

[0020] In the above structure, the spraying mechanism includes a drain pipe 42 horizontally positioned above the spraying device 4. Multiple atomizing nozzles 43 are located at the bottom of the drain pipe 42 and are situated within the spraying device 4, with their spray direction facing the airflow channel. A water collecting pipe 41 is horizontally positioned at the bottom of the spraying device 4, and multiple water collecting ports 411 are provided on the water collecting pipe 41. Preferably, the water collecting ports 411 are funnel-shaped with their openings facing upwards. The spraying mechanism can filter the gas carrying paint mist; the paint and most of the liquid will fall to the bottom of the spraying device 4 due to their own gravity and be collected by the water collecting pipe 41.

[0021] In the above structure, the water treatment unit 2 includes a stirring chamber 21 and a filtration chamber 22, with the stirring chamber 21 located above the filtration chamber 22. The stirring chamber 21 is equipped with a stirring assembly 211, and a drive motor 212 is located at the top of the stirring chamber 21. The stirring assembly 211 is electrically connected to the drive motor 212. The filtration chamber 22 is equipped with a filter screen 221.

[0022] It should be understood that the stirring component 211 is prior art, and its specific structure has been disclosed, so it will not be described in detail here.

[0023] Further explanation: The top of the mixing chamber 21 is equipped with a water outlet, which is connected to the drain pipe 42 via a water outlet pipe. The bottom of the mixing chamber 21 is equipped with a drain outlet 213, and an electric drain valve is installed at the drain outlet 213. The bottom of the filter chamber 22 is equipped with a water inlet, which is connected to the water collection pipe 41 via a water inlet pipe 10. A water circulation pump 9 is installed on the water inlet pipe 10. The filter screen 221 has a double-layer structure and is located above the water inlet. The liquid carrying paint mist collected by the water collection pipe 41 is transported to the mixing chamber 21 in the water treatment unit 2 by the action of the water circulation pump 9. The mixing component 211 mixes and treats the wastewater. At the same time, the operator puts flocculant into the chamber, so that the wastewater can quickly flocculate under the action of the mixing component 211. The impurities after flocculation can be filtered by the filter screen 221 and discharged through the drain outlet 213. The filtered liquid is discharged through the water outlet and transported back to the drain pipe 42 for spraying, thereby realizing the recycling of wastewater.

[0024] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A waste gas and water recycling system for a paint spraying line, characterized in that, include: The exhaust gas treatment unit (1) and the water treatment unit (2) are provided. The exhaust gas treatment unit (1) includes a pretreatment device (3) and a spray device (4) arranged sequentially along the exhaust gas flow direction. One end of the pretreatment device (3) is provided with an air inlet and is connected to the outlet section of the paint booth through an air inlet pipe (5). The other end is connected to the inlet end of the spray device (4) through an air supply pipe (6). A medium-efficiency filter group (31) is provided in the pretreatment device (3) and near the air inlet. The outlet of the spray device (4) is... The outlet end is connected to the entrance section of the spray booth through the air outlet pipe (7). An exhaust fan (8) is provided on the air outlet pipe (7). The spray device (4) has an airflow channel, which is connected to the air supply pipe (6) and the air outlet pipe (7). The top of the spray device (4) is provided with a spraying mechanism, and the bottom of the spray device (4) is provided with a water collection pipe (41). The water treatment unit (2) is provided between the spraying mechanism and the water collection pipe (41) to form a water circulation structure.

2. The paint spraying line exhaust gas and water recycling system according to claim 1, characterized in that, The spraying mechanism includes a drainage pipe (42), which is horizontally arranged above the spraying device (4). A plurality of atomizing nozzles (43) are arranged at the bottom of the drainage pipe (42). The atomizing nozzles (43) are located inside the spraying device (4), and the spraying direction of the atomizing nozzles (43) is towards the airflow channel.

3. The paint spraying line exhaust gas and water recycling system according to claim 1, characterized in that, The water collection pipe (41) is horizontally arranged at the bottom of the spray device (4), and multiple water collection ports (411) are provided on the water collection pipe (41).

4. The paint spraying line exhaust gas and water recycling system according to claim 3, characterized in that, The water inlet (411) is funnel-shaped.

5. The paint spraying line exhaust gas and water recycling system according to claim 2, characterized in that, The water treatment unit (2) includes a stirring chamber (21) and a filtration chamber (22). The stirring chamber (21) is located above the filtration chamber (22). A stirring assembly (211) is provided inside the stirring chamber (21). A drive motor (212) is provided at the top of the stirring chamber (21). The stirring assembly (211) is electrically connected to the drive motor (212). A filter screen (221) is provided inside the filtration chamber (22).

6. The paint spraying line exhaust gas and water recycling system according to claim 5, characterized in that, The top of the stirring chamber (21) is provided with a water outlet and is connected to the drain pipe (42) through a water outlet pipe. The bottom of the stirring chamber (21) is provided with a sewage outlet (213). The bottom of the filter chamber (22) is provided with a water inlet and is connected to the water collection pipe (41) through a water inlet pipe (10). A water circulation pump (9) is provided on the water inlet pipe (10). The filter screen (221) is located above the water inlet.

7. The paint spraying line exhaust gas and water recycling system according to claim 6, characterized in that, An electric drain valve is provided at the drain outlet (213).

8. The paint spraying line exhaust gas and water recycling system according to claim 1, characterized in that, The medium-efficiency filter group (31) includes multiple vertically arranged medium-efficiency filters.

Images