Dry purification device for over-sprayed paint mist

Abstract

The utility model discloses an over-spray paint mist dry purification device which comprises a dust remover body, a fluidizing device, a powder feeding device and an ash conveying device, the powder feeding device is communicated with the dust remover body through a conveying pipeline, so that pre-coating powder in the powder feeding device enters the dust remover body along the conveying pipeline; the fluidizing device is arranged at the bottom of the dust remover body and is configured to be used for collecting dust and a paint mist mixture in the dust remover body; the ash conveying device is connected with the fluidizing device and is configured to collect dust and paint mist mixtures in the fluidizing device. When the over-spray paint mist treatment device is used for treating over-spray paint mist, inert powder is added and fully mixed with the over-spray paint mist, so that the viscosity of the paint mist is greatly reduced, the filter plate is effectively prevented from being blocked due to the viscosity of the over-spray paint mist, and the over-spray paint mist can be efficiently removed.

Description

Technical Field

[0001] This utility model patent relates to the field of paint mist purification, and in particular to a dry purification device for oversprayed paint mist. Background Technology

[0002] For industries such as automobiles, home appliances, furniture, toys, and hardware that require painting, environmental protection is a major problem hindering the painting process. According to relevant testing data, the paint adhesion rate is only 50-70%, and oversprayed paint mist disperses with the ambient airflow, causing serious environmental pollution. Regarding paint mist purification, water curtain-type paint mist purification devices are commonly used in various industries' painting processes, but their effectiveness remains far from satisfactory. The main drawbacks are as follows: Traditional water curtain-type paint mist purification devices utilize water pumps to create a jet-like overflow through water pipes, water curtain plates, and spray nozzles, forming a waterfall-like water mist. When the sprayed paint mist hits the water mist, it is absorbed and flushed into a wastewater tank. Due to the use of circulating water, waste paint easily adheres to the water pumps, pipes, and spray nozzles, causing blockages that require manual cleaning every 2-3 days, resulting in a large workload. Paint mist accumulation on the water curtain plates causes discontinuous water flow, leading to low purification efficiency. The circulating water needs frequent discharge and replacement every 2-3 days, inevitably causing secondary pollution. The water mist during operation corrodes all equipment, shortening its lifespan and increasing maintenance costs. With increasing water shortages in various regions, rising water prices, and water rationing further exacerbate operating costs. Furthermore, the need for wastewater treatment in response to increasingly stringent environmental regulations adds another considerable operating expense.

[0003] The purpose of this invention is to provide a dry purification device for oversprayed paint mist, which can not only effectively remove oversprayed paint mist, but also make the purified airflow fully or partially recycled as much as possible, so as to achieve the purpose of purifying the environment and effectively saving energy. Utility Model Content

[0004] The purpose of this invention is to provide a dry purification device for oversprayed paint mist. When treating oversprayed paint mist, inert powder is added and thoroughly mixed with the mist, significantly reducing its viscosity. This effectively prevents filter clogging caused by the viscosity of the oversprayed paint mist, resulting in highly efficient removal of oversprayed paint mist. The dust content of the purified airflow is <0.1 mg / m³. 3 Moreover, the purified airflow can be directly returned to the spray booth for recycling, replacing the wet method with the dry method, eliminating wastewater treatment issues, reducing energy consumption by more than 60%, and achieving environmental purification and high-efficiency energy saving.

[0005] According to an embodiment of the present invention, a dry purification device for overspray paint mist is provided, comprising a dust collector body, a fluidization device, a powder feeding device, and a dust conveying device.

[0006] The described dust collector body includes a dust hopper, a dust gas chamber, a clean gas chamber, and a main induced draft fan, which are connected in sequence from bottom to top. The upper part of the dust hopper is connected to the dust gas chamber, and the lower part of the dust hopper is connected to the fluidization device. A filter plate is installed in the dust gas chamber. Preferably, the filter plate uses sintered plate filter media; an overspray mist air flow inlet is provided on the side of the dust gas chamber, which is connected to the air outlet of the paint spraying booth through an air inlet pipe; at the same time, the pre-coating material feeding port of the powder feeding device is connected to the air inlet pipe through a powder feeding pipe. The upper part of the dust gas chamber is connected to the bottom of the clean gas chamber, and the lower part of the dust gas chamber is connected to the upper part of the dust hopper. A dust cleaning device is installed in the clean gas chamber. The lower part of the clean gas chamber is connected to the upper part of the dust gas chamber, and the side outlet air vent of the clean gas chamber is connected to the main induced draft fan. Preferably, the main induced draft fan uses an explosion-proof fan, the motor supporting the main induced draft fan uses an explosion-proof motor, and the exhaust air outlet of the main induced draft fan is connected to the air inlet of the paint spraying booth through an exhaust air pipe.

[0007] The described fluidization device includes a dust bucket, a fluidization plate, a fluidization pipe, and a fluidization fan. The upper part of the dust bucket is connected to the dust hopper, and the lower part is connected to the pipeline of the ash conveying system. A fluidization plate is provided at the bottom of the middle part of the dust bucket. Preferably, the fluidization plate uses a multi-microporous plate and is inclined at the bottom of the dust bucket. A fluidization nozzle is provided in the bottom cavity of the fluidization plate, and the fluidization nozzle is connected to an external fluidization fan through a fluidization pipe.

[0008] The described powder feeding device includes a material bin, a rotary discharge valve, and a powder feeding nozzle. The material bin contains pre-coating powder. Preferably, the pre-coating powder uses inert powder materials such as talc powder and calcium carbonate powder. The lower part of the material bin is connected to the rotary discharge valve, and the lower part of the rotary discharge valve is connected to the powder feeding nozzle. The powder feeding nozzle is sprayed into the dust gas chamber of the dust collector body through a powder feeding pipe and an air inlet pipe in sequence.

[0009] The described ash conveying device includes an ash feeding nozzle, a dust storage bin, a dust discharge valve, a top filter of the bin, and an induced draft fan. The ash feeding nozzle is installed below the ash storage tank at the bottom of the dust bucket of the fluidization device, and conveys the dust and paint mist mixture captured by the dust collector body to the dust storage bin through the ash conveying system pipeline. After being purified by the top filter of the bin, the clean gas is discharged into the air through the induced draft fan, and the dust and paint mist mixture falls into the dust storage bin and is discharged into the ash collection bucket at the bottom through the dust discharge valve.

[0010] From the above technical solutions, it can be seen that the present utility model provides a dry purification device for overspray mist. When treating overspray mist, by adding inert powder materials to fully mix with the overspray mist, the viscosity of the overspray mist is greatly reduced, effectively preventing the filter plate from being blocked due to the viscosity of the overspray mist, and the overspray mist can be efficiently removed. The content of air flow dust in the purified clean gas is <0.1mg / m 3 , and the air flow of the purified clean gas can directly return to the paint spraying booth for recycling. Using the dry method instead of the wet method, there is no problem of wastewater treatment, and the energy consumption is reduced by more than 60%, achieving the effects of purifying the environment and saving energy efficiently. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 The present invention provides a schematic diagram of the structure of a dry purification device for overspray paint mist according to a preferred embodiment.

[0013] Illustration:

[0014] 1-Dust collector body, 1A-Ash hopper, 1B-Dust chamber, 1C-Clean air chamber, 1D-Filter plate, 1E-Main induced draft fan, 1F-Dust cleaning device; 2-Fluidization device, 2A-Ash bucket, 2B-Fluidization plate, 2C-Fluidization fan, 2D-Fluidization pipe; 3-Powder feeding device, 3A-Blouse, 3B-Rotary discharge valve, 3C-Powder feeding nozzle; 4-Ash conveying device, 4A-Ash feeding nozzle, 4B-Ash storage silo, 4C-Ash discharge valve, 4D-Blouse top filter, 4E-Induced draft fan, 4F-Ash collection bucket. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Figure 1 This is a schematic diagram of a dry purification device for overspray paint mist according to a preferred embodiment. Figure 1 As shown, a dry purification device for spray paint mist includes a dust collector body 1, a fluidizing device 2, a powder feeding device 3, and an ash conveying device 4. The dust collector body includes an ash hopper 1A, a dust chamber 1B, a clean air chamber 1C, a filter plate 1D, a main induced draft fan 1E, and a dust removal device 1F; the fluidizing device 2 includes an ash bucket 2A, a fluidizing plate 2B, a fluidizing fan 2C, and a fluidizing pipe 2D; the powder feeding device 3 includes a hopper 3A, a rotary discharge valve 3B, and a powder feeding nozzle 3C; the ash conveying device 4 includes an ash feeding nozzle 4A, an ash storage hopper 4B, an ash discharge valve 4C, a hopper top filter 4D, an induced draft fan 4E, and an ash collection bucket 4F.

[0017] In one specific embodiment of this disclosure, the powder feeding device 3 is connected to the dust collector body 1 via a conveying pipe, so that the pre-coating powder in the powder feeding device 3 enters the dust collector body 1 along the conveying pipe. The fluidizing device 2 is disposed at the bottom of the dust collector body 1 and is configured to collect the dust and paint mist mixture in the dust collector body 1; the ash conveying device 4 is connected to the fluidizing device 2 and is configured to collect the dust and paint mist mixture in the fluidizing device 2.

[0018] The upper part of the dust hopper 1A of the dust collector body 1 is connected to the lower part of the dust chamber 1B, and the upper part of the dust chamber 1B is connected to the lower part of the clean air chamber 1C. A filter plate 1D is installed in the dust chamber 1B. The top of the filter plate 1D has a sealing strip, which connects it to the perforated plate at the bottom of the clean air chamber 1C. When the dust-laden airflow (a mixture of dust and paint mist) containing paint mist and pre-coating passes through the filter plate 1D, the dust is blocked on the outer surface of the filter plate 1D. The purified clean airflow enters the clean air chamber 1C after passing through the inner cavity of the filter plate 1D. Preferably, the filter plate is made of sintered plate filter material. The side of the clean air chamber 1C is connected to the air inlet of the main induced draft fan 1E.

[0019] The top of the ash bucket 2A of the fluidizing device 2 is connected to the bottom of the ash hopper 1A of the dust collector body 1. The fluidizing plate 2B is set at the bottom of the ash bucket 2A, dividing the ash bucket 2A into a fluidizing gas chamber and a fluidizing dust chamber. Preferably, the fluidizing plate 2B is a multi-micro-perforated plate, which is placed at the bottom of the ash bucket 2A in an inclined manner. The air outlet of the fluidizing blower 2C is connected to the fluidizing gas chamber at the bottom of the ash bucket 2A through the fluidizing pipe 2D. Preferably, the fluidizing blower is a vortex blower.

[0020] The fluidizing plate 2B has a fluidizing nozzle at the bottom cavity. The fluidizing nozzle is connected to the fluidizing fan 2C through the fluidizing pipe 2D. The fluidizing nozzle is configured to blow up at least part of the pre-coating powder attached to the fluidizing plate 2B under the action of the fluidizing fan 2C, so that the blown pre-coating powder enters the dust chamber 1B and attaches to the filter plate 1D.

[0021] The powder feeding device 3 includes a hopper 3A, a rotary discharge valve 3B, and a powder feeding nozzle 3C. The bottom of the hopper 3A is equipped with a rotary discharge valve 3B, and the bottom of the rotary discharge valve 3B is equipped with a powder feeding nozzle 3C. The pre-coated powder is fed into the dust chamber 1B of the dust collector body 1 through the powder feeding pipe and the air inlet pipe. Preferably, the powder feeding nozzle 3C adopts a positive pressure powder feeding method with compressed air.

[0022] In one embodiment of this disclosure, the silo 3A contains pre-coating powder. The bottom of the silo 3A is connected to a rotary discharge valve 3B, and the bottom of the rotary discharge valve 3B is connected to a powder feeding nozzle 3C. Under the action of the powder feeding nozzle 3C, the pre-coating powder enters the dust chamber 1B along the conveying pipe. The conveying pipe includes an air inlet pipe connected to the dust chamber 1B and a powder feeding pipe connected to the powder feeding nozzle 3C.

[0023] In one embodiment of this disclosure, the conveying pipeline further includes a paint spraying pipeline, which is connected to both the dust chamber 1B and the spray booth, so that the paint mist mixture in the spray booth enters the dust chamber 1B along the paint spraying pipeline. The conveying pipeline connects the spray booth, the powder feeding device 3, and the dust chamber 1B of the dust collector body 1. Through the conveying pipeline, pre-coated powder and oversprayed paint mist can be conveyed into the dust chamber 1B and mixed to form a dust and paint mist mixture.

[0024] The ash conveying device 4 includes an ash delivery nozzle 4A, an ash storage silo 4B, an ash discharge valve 4C, a silo top filter 4D, an induced draft fan 4E, and an ash collection bucket 4F. The ash storage silo 4B has a silo top filter 4D installed on top, and an induced draft fan 4E is mounted on top of the silo top filter 4D. Preferably, the induced draft fan 4E is a vortex vacuum fan. The ash storage silo 4B has an ash discharge valve 4C at the bottom. Preferably, the ash discharge valve 4C is a rotary discharge valve. An ash conveying inlet is located in the middle of the ash storage silo 4B. The ash delivery nozzle 4A, connected to the ash storage tank of the ash bucket 2A of the fluidizing device 2 via the ash conveying system pipeline, cooperates with the ash delivery nozzle 4A to deliver dust (a mixture of dust and paint mist) into the ash storage silo 4B under the action of compressed air through the ash conveying system pipeline.

[0025] The working principle of the dry purification device for overspray paint mist in this application will be described in detail below.

[0026] After the main induced draft fan 1E in the fan box of the dry purification device for paint mist is turned on, the powder feeding device 3 is then turned on. The pre-coating powder in the silo 3A enters the powder feeding nozzle 3C under the action of the rotary discharge valve 3B at the bottom of the silo 3A. The powder feeding nozzle 3C, under the action of compressed air, sprays the pre-coating powder into the air inlet pipe through the powder feeding pipe in a positive pressure manner, and then into the dust chamber 1B of the dust collector body 1. After the pre-coating powder fully covers the outer surface of the filter plate 1D, the spray booth and air inlet pipe valves are opened, and the paint mist is discharged in a negative pressure environment. Under pressure, the oversprayed paint mist enters the dust chamber of the dust collector body 1 through the inlet duct. It continuously mixes with the pre-coating powder, coating the outer surface of the oversprayed paint mist with a layer of pre-coating powder, thus greatly reducing its viscosity. The oversprayed paint mist coated with pre-coating powder is then captured by the filter plate 1D, whose outer surface is also coated with pre-coating powder, under the influence of the airflow. Due to the barrier effect of the pre-coating powder, the oversprayed paint mist cannot directly contact the outer surface of the filter plate 1D, thus avoiding blockage caused by direct contact. The purified clean airflow passes through the exhaust port of the main exhaust fan 1E and is then sent through the exhaust duct to the air inlet of the paint booth, thereby achieving air circulation during the painting process. In a specific embodiment, the filter plate 1D is a sintered plate, and the oversprayed paint mist coated with pre-coating powder is captured by the sintered plate filter material with the pre-coating powder coating on its outer surface under the influence of the airflow. When the amount of oversprayed paint mist and dust (a mixture of dust and paint mist) captured on the outer surface of filter plate 1D reaches a certain level, the dust removal device 1F is activated. Dust removal can be performed by differential pressure or timed method. Under the action of gravity, the oversprayed paint mist and dust fall through the ash hopper 1A onto the fluidizing plate 2B in the ash bucket 2A of the fluidizing device 2. The fluidizing fan 2C is turned on, blowing air into the fluidizing chamber at the bottom of the ash bucket 2A. The air passes through the porous fluidizing plate 2B, agitating the oversprayed paint mist with pre-coating powder on the fluidizing plate 2B. The free pre-coating powder on the surface of the oversprayed paint mist is relatively fine. Under the action of the blown airflow and the negative pressure of the main induced draft fan 1E, it is carried back into the dust chamber 1B and adsorbed on the outer surface of filter plate 1D, which plays a role in isolating the outer surface of filter plate 1D from fresh oversprayed paint mist. At the same time, it also reduces the amount of fresh pre-coating powder to be added. When the amount of oversprayed paint mist particles with pre-coated powder saturated in the ash bucket 2A reaches a certain level, the ash conveying device 4 is activated. Through the ash storage trough at the bottom of the ash bucket 2A and the ash conveying nozzle 4A, the oversprayed paint mist mixture and dust are sent into the ash storage silo 4B. The dust-laden airflow is purified by the silo top filter 4D at the top of the ash storage silo 4B. The purified clean airflow is discharged into the atmosphere by the induced draft fan 4E. The dust and paint mist mixture captured by the silo top filter 4B is discharged into the ash collection bucket 4F at the bottom of the ash storage silo 4B through the ash discharge valve 4C.

[0027] As can be seen from the above technical solution, this utility model provides a dry purification device for oversprayed paint mist. When treating oversprayed paint mist, inert powder is added and thoroughly mixed with the oversprayed paint mist, thereby greatly reducing the viscosity of the paint mist and effectively preventing filter plate clogging due to the viscosity of the oversprayed paint mist. This allows for efficient removal of oversprayed paint mist, with the purified airflow dust content <0.1mg / m³. 3 Moreover, the purified airflow can be directly returned to the spray booth for recycling, replacing the wet method with the dry method, eliminating wastewater treatment issues, reducing energy consumption by more than 60%, and achieving environmental purification and high-efficiency energy saving.

[0028] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0029] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A dry purification device for overspray paint mist, characterized in that, The device includes a dust collector body, a fluidizing device, a powder feeding device, and a dust conveying device. The powder feeding device is connected to the dust collector body via a conveying pipe, so that the pre-coating powder in the powder feeding device enters the dust collector body along the conveying pipe. The fluidizing device is located at the bottom of the dust collector body and is configured to collect the dust and paint mist mixture within the dust collector body. The dust conveying device is connected to the fluidizing device and is configured to collect the dust and paint mist mixture within the fluidizing device.

2. The dry purification device for overspray paint mist according to claim 1, characterized in that, The dust collector body includes a dust hopper, a dust chamber, a filter plate, a clean air chamber, and a main induced draft fan. The top of the dust hopper is connected to the bottom of the dust chamber, the top of the dust chamber is connected to the bottom of the clean air chamber, the filter plate is installed in the dust chamber, and the side of the clean air chamber is connected to the air inlet of the main induced draft fan.

3. The dry purification device for overspray paint mist according to claim 2, characterized in that, The powder feeding device includes a hopper, a rotary discharge valve, and a powder feeding nozzle. The hopper contains the pre-coating powder, and the bottom of the hopper is connected to the rotary discharge valve. The bottom of the rotary discharge valve is connected to the powder feeding nozzle. Under the action of the powder feeding nozzle, the pre-coating powder enters the dust chamber along the conveying pipe. The conveying pipe includes an air inlet pipe connected to the dust chamber and a powder feeding pipe connected to the powder feeding nozzle.

4. The dry purification device for overspray paint mist according to claim 3, characterized in that, The conveying pipeline also includes a paint spraying pipeline, which is connected to the dust chamber and the paint booth respectively, so that the paint mist mixture in the paint booth enters the dust chamber along the paint spraying pipeline.

5. The dry purification device for overspray paint mist according to claim 2, characterized in that, The fluidization device includes an ash bucket, a fluidizing plate disposed inside the ash bucket, a fluidizing fan, and a fluidizing pipe. The upper and lower sides of the ash bucket are connected to the ash hopper and the ash conveying system pipeline, respectively, so that the dust and paint mist mixture in the ash hopper enters the ash bucket and enters the ash conveying device through the ash conveying system pipeline. The fluidizing plate is disposed in the ash bucket and divides the ash bucket into a fluidizing gas chamber and a fluidizing dust chamber.

6. The dry purification device for overspray paint mist according to claim 5, characterized in that, The fluidizing plate has a fluidizing nozzle at its bottom cavity. The fluidizing nozzle is connected to the fluidizing fan through a fluidizing pipe. The fluidizing nozzle is configured to blow up at least a portion of the pre-coating powder adhering to the fluidizing plate under the action of the fluidizing fan, so that the blown-up pre-coating powder enters the dust chamber and adheres to the filter plate.

7. The dry purification device for overspray paint mist according to claim 5, characterized in that, The ash conveying device includes an ash feeding nozzle, an ash storage bin, an ash discharge valve, a bin top filter, and an induced draft fan. The bottom of the ash bin is provided with an ash storage trough, and the ash feeding nozzle is installed below the ash storage trough. The ash feeding nozzle is configured to convey the dust and paint mist mixture in the ash bin to the ash storage bin through the ash conveying system pipeline. After the dust and paint mist mixture is purified by the bin top filter, the clean gas is discharged by the induced draft fan, and the dust and paint mist mixture falls into the ash storage bin.

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