CN114832527A

CN114832527A - Paint mist separation unit, paint mist separation device and spraying equipment

Info

Publication number: CN114832527A
Application number: CN202210256331.6A
Authority: CN
Inventors: 孔飞; 林涛; 赵剑; 黄鹏; 刘天力; 张川; 韩俊; 韩俊杰; 刘皓; 王臣第
Original assignee: China Automobile Industry Engineering Co Ltd; Scivic Engineering Corp
Current assignee: China Automobile Industry Engineering Co Ltd; Scivic Engineering Corp
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-08-02

Abstract

The invention discloses a paint mist separation unit, a paint mist separation device and spraying equipment. The paint mist separation unit is of a split structure and comprises a recycled external structure and a disposable paint mist separation box matched with the external structure, wherein the external structure is provided with an inlet and an outlet for flowing in and out; the external structure consists of a base forming the outlet and a plurality of side frames vertically arranged on the upper surface of the base, the side frames are positioned between the outlet and the outer edge of the base, and after the side frames are sequentially connected in a head-to-tail manner, a space for accommodating the paint mist separation box is defined between the upper surface of the base and the inner side surface of the side frames; the paint mist separation box comprises a shell with an air flow inlet and an air flow outlet which are opposite, and a paint mist separation structure arranged in the shell. The paint mist separation unit is simple in structure and convenient to manufacture and use.

Description

Paint mist separation unit, paint mist separation device and spraying equipment

Technical Field

The invention relates to the technical field of paint mist separation of over-spraying, in particular to a paint mist separation unit, a separation device and spraying equipment.

Background

In the spraying process, if the paint is sprayed after being atomized by using a spray gun or an atomizer, a part of atomized paint mist particles will adhere to a target workpiece, and the rest paint mist particles will be scattered into the nearby air and guided to the processing device along with the air flow in the spraying chamber. Traditional coating cloud processing system is wet-type venturi coating cloud processing system, and this kind of treatment mode can produce a large amount of waste water to the increase of air humidity after handling can not directly circulate to spouting the room and use, needs the air conditioner to handle once more, can consume a large amount of energy.

With the whole industry upgrading and adjustment of air pollution treatment and green energy-saving industry and intelligent production, the traditional wet paint mist separation system cannot meet the domestic energy-saving and environment-friendly requirements. The dry-type carton paint mist separation system is the latest international paint mist separation technology at present, and has the advantages of energy conservation, environmental protection, low cost and simple waste treatment. The dry paint mist separation system adopts a disposable paper box made of naturally regenerated flame-retardant corrugated boards to replace water and chemical agents, and comprehensively utilizes the principles of gravity, centrifugal force and inertia force to capture paint mist particles passing through a paint spraying chamber, so that the purification of the exhaust air of the paint spraying chamber is realized.

In recent two years, some dry paint mist separation technologies are disclosed, for example, in patent application No. CN 105705216 a, a cubic filter paper box with a size of about 500mm is used as a disposable filter material, a plurality of standard size filter paper boxes need to be taken out of a filter unit every time the filter unit is replaced, and the inner wall of the filter unit needs to be cleaned regularly.

Some dry-type coating cloud separation technique publications in two years, like the patent application of publication No. CN 103608124A, use the filter paper case of integral type, but to the carton bulk strength requirement height, need increase a large amount of structure reinforcing material in carton inside, like stuff or plastic slab etc. this type of material is useless as danger along with the carton together and handles, not only not environmental protection, has increased raw and other materials cost and the useless processing cost of danger moreover.

Disclosure of Invention

The present invention is directed to overcoming the technical drawbacks of the prior art, and provides a paint mist separating unit, a paint mist separating device, and a painting apparatus for separating paint mist from a painted air flow.

The invention provides a paint mist separation unit, which is used for separating and discharging a top-down airflow containing paint mist from a paint spraying chamber, is of a split structure and comprises a recycled external structure and a disposable and removable paint mist separation box matched with the external structure, wherein the top of the external structure is provided with an inlet for receiving the airflow, and the bottom of the external structure is provided with an outlet for discharging the airflow; the external structure consists of a base with an outlet formed inside and a plurality of side frames vertically arranged on the upper surface of the base, the side frames are detachably arranged between the outlet and the outer edge of the base, and after the side frames are sequentially connected in a head-to-tail manner, a space for accommodating the paint mist separation box is formed between the upper surface of the base and the inner side surface of each side frame; the paint mist separation box comprises a shell and a paint mist separation structure arranged in the shell, wherein the top of the shell corresponds to an airflow inlet of the inlet, and the bottom of the shell is provided with an airflow outlet corresponding to the outlet.

In a second aspect of the present invention, a paint mist separating device is provided, which includes the paint mist separating unit, a diversion cavity and an exhaust cavity, wherein the diversion cavity is disposed at the bottom of a paint spray booth, the exhaust cavity is disposed below the diversion cavity and is vertically spaced from the diversion cavity, the paint mist separating unit is disposed between the diversion cavity and the exhaust cavity, the paint mist separating unit is a replaceable paint mist separating module, and is disposed at an operating position between the diversion cavity and the exhaust cavity during operation to connect the diversion cavity and the exhaust cavity, so that an air flow passage is formed between the diversion cavity and the exhaust cavity, through which an air flow flows from top to bottom and then is exhausted, and the air flow which is introduced from the diversion cavity and contains paint mist from top to bottom and is exhausted from the exhaust cavity after being separated and processed by the paint mist separating unit.

The third aspect of the invention provides spraying equipment, which comprises the paint mist separating device, a pressure equalizing chamber and a paint spraying chamber, wherein the pressure equalizing chamber, the paint spraying chamber and the paint mist separating device are sequentially connected from top to bottom, the spraying equipment is arranged in the paint spraying chamber, the pressure equalizing chamber is used for sending clean airflow into the paint spraying chamber, the paint mist separating device adopts the paint mist separating device, a flow guide cavity of the paint mist separating device is connected with the bottom of the paint spraying chamber, and the purpose that the airflow which is guided from the paint spraying chamber by the flow guide cavity and contains paint mist from top to bottom and is separated by the paint mist separating device and then is discharged by an exhaust cavity is achieved.

The over-sprayed paint mist separation unit is of a split structure, a recyclable external structure and a disposable integral paint mist separation box are arranged in the over-sprayed paint mist separation unit, the structures needing butt joint and transportation can be reused, and the intermediate disposable paint mist separation box does not need high-strength supporting materials and can be removed at one time; not only is convenient to operate, but also reduces the use cost.

According to the overspray paint mist separation device provided by the invention, the one-time filtering unit of the overspray paint mist separation device is formed by replacing a plurality of standard 500mm paint mist filtering boxes with an integral paint mist filtering box, so that the operation steps are reduced, the operation that the paint mist on the inner wall needs to be cleaned by using the standard paint mist filtering boxes is avoided, and meanwhile, the depth is more than 500mm, so that the paint mist capturing capacity is greatly improved.

The paint mist separation unit, the interfaces of the diversion cavity and the exhaust cavity and the base used in the transportation process can be made of hard high-strength materials and can be recycled, and the middle disposable paint mist separation box does not need to be additionally provided with high-strength supporting materials.

According to the over-sprayed paint mist separating device, the air flow with over-sprayed paint mist discharged from the paint spraying chamber passes through the paint mist separating unit from top to bottom and then enters the air discharging cavity, the flowing direction of the whole air flow is not changed, the resistance to the air flow is lower, and the electric quantity consumption of a fan is reduced. And the pollution to the side wall of the diversion cavity is less, and the cleaning and maintenance cost in the daily operation process is reduced.

The paint mist separation device provided by the invention has the advantages that the number of external structural components of the paint mist separation unit is small, positioning pins, locking mechanisms and the like are used among the components, the assembling or disassembling operation is simple, and the replacement of the middle paint mist separation box is quick and convenient.

The overspray paint mist separation device and the spraying equipment provided by the invention can replace the traditional wet venturi system, do not waste water resources, do not use chemical agents, reduce the generation amount of hazardous wastes, and can be continuously recycled into a spraying room for use because the filtered air flow does not generate severe temperature and humidity changes, thereby being a new technology with energy conservation, environmental protection and low operation cost.

Drawings

Fig. 1 shows a perspective view of a paint mist separating unit of an exemplary embodiment of the present invention;

FIG. 2 shows a cross-sectional view of the exemplary embodiment of FIG. 1;

FIG. 3 illustrates an enlarged partial view of the exemplary embodiment of FIG. 1, illustrating the locking mechanism changing from an unlocked state to a locked state;

fig. 4 shows a component diagram of an unassembled state of the paint mist separating unit of an exemplary embodiment of the present invention, in which the outer structure has four side frames composed of two first side frames, two second side frames;

fig. 5 is a perspective view showing an external structure of a paint mist separating unit according to an exemplary embodiment of the present invention;

FIG. 6 illustrates a perspective view of a paint mist separator box according to an exemplary embodiment of the present invention;

FIG. 7 shows a cross-sectional view of the exemplary embodiment of FIG. 5;

fig. 8 is a perspective view showing a base of an external structure of a paint mist separating unit according to an exemplary embodiment of the present invention;

FIG. 9 shows a perspective view of a first side frame of an external structure of a paint mist separation unit of an exemplary embodiment of the present invention, wherein a first locking mechanism on the first side frame is stationary;

FIG. 10 shows a perspective view of a second side frame of the exterior structure of the paint mist separation unit of the exemplary embodiment of the invention, wherein a second locking mechanism on the second side frame is active;

FIG. 11 shows a perspective view of a paint mist separator according to an exemplary embodiment of the present invention;

FIG. 12 shows a side view of the exemplary embodiment of FIG. 10, wherein the transport mechanism is not shown in the figure;

FIG. 13 shows a cross-sectional view of the exemplary embodiment of FIG. 10;

fig. 14 shows a schematic cross-sectional view of a spray device according to an exemplary embodiment of the present invention.

Description of the reference numerals

100 spray coating device

110 pressure equalizing chamber

120 spray booth

121 workpiece

122 atomizing device

200 paint mist separating device

210 flow guiding cavity

211 inlet docking assembly

220 air exhaust cavity

221 outlet butt joint device

230 guide mechanism

240 transport mechanism

300 paint mist separation unit

310 outer structure

311 base

312 positioning hole

313a first side frame

313b second side frame

314a first beam

314b second beam

315 support leg

316 locating pin

317a first locking mechanism

317b second locking mechanism

320 paint mist separation box

321 outer casing

322 airflow inlet

323 gas flow outlet

324 separation structure

330 inlet

340 outlet

350 accommodating part

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 10, a structure of a paint mist separating unit 300 of an exemplary embodiment will be described. As shown in fig. 1, the paint mist separating unit 300 according to the embodiment of the present invention is used for separating overspray paint mist generated during a spraying process, and includes an outer structure 310 having a rectangular shape and a paint mist separating box 320. The outer structure 310 is a split structure, and includes a base 311 and two first side frames 313a and two second side frames 313b, which are oppositely disposed, and the first side frames 313a and the second side frames 313b are spaced apart and perpendicular to each other. The interior of the outer structure 310 has a receiving portion 350 in which the paint mist separator box 320 can be placed. The paint mist separator box 320 is disposed in the receptacle 350 of the outer structure 310, the paint mist separator box 320 being a replaceable, single-use paint mist separator member.

The paint mist separating unit 300 has an inlet 330 through which the air flows in and an outlet 340 through which the air flows out, the inlet 330 and the outlet 340 being disposed opposite to each other on opposite sides of the paint mist separating unit 300, the air flow with the paint mist passing through the inlet 330 enters the paint mist separating unit 300, passes through the paint mist separating box 320 to separate and capture the paint mist, and the relatively clean air flow is discharged from the outlet 340, as shown in fig. 2.

When placed in the operational position, the air flow inlet 330 of the paint mist separation unit 300 can be connected to the inlet docking arrangement 211 of the paint mist separation apparatus 200 and the air flow outlet 340 of the paint mist separation unit 300 can be connected to the outlet docking arrangement 221 of the paint mist separation apparatus 200, as shown in FIG. 13.

As shown in fig. 8, the base 311 of the external structure 310 has an outlet 340 at the center thereof for the airflow of the paint mist separating unit 300 to flow out, and twelve positioning holes 312 corresponding to the first side frame 313a and the second side frame 313b are formed on the upper plane thereof, and each side frame occupies a straight space. The upper surface of the base 311 may be connected to an air flow outlet 323 of the paint mist separator tank 320.

As shown in fig. 9 and 10, the first side frame 313a of the external structure 310 has a first beam 314a and a first locking mechanism 317a, the second side frame 313b has a second beam 314b and a first locking mechanism 317b, and each of the first side frame 313a and the second side frame 313b includes three support legs 315 and three positioning pins 316. The supporting legs 315 are vertically placed below the corresponding cross beams, the positioning pins 316 are placed at the bottom of each supporting leg 315, and the positioning pins 316 can be conical, so that the positioning holes 312 of the base 311 can be conveniently placed. The first locking mechanism 317a of the first side frame 313a is fixed, the second locking mechanism 317b of the second side frame 313b is movable, two different locking mechanisms can be connected and locked, for example, a pin hole structure is adopted for locking, one locking mechanism is a locking groove or a locking hole, the other locking mechanism is a pin plate, and the pin plate can rotate in one direction to realize locking in combination with the locking groove or the locking hole or rotate in the other direction to realize separation from the locking groove or the locking hole. Preferably, the second locking mechanism is a rotatable L-shaped locking plate, and the first locking mechanism is an L-shaped plate which is matched with the L-shaped locking plate of the locking groove and is formed between the first locking mechanism and the side face of the cross beam.

As shown in fig. 4, the positioning pins 316 of the two first side frames 313a and the two second side frames 313b of the external structure 310 can be correspondingly installed in the positioning holes 312 of the base 311 to complete the installation of the two first side frames 313a and the two second side frames 313b in combination with the base 311, or the positioning pins 316 of the two first side frames 313a and the two second side frames 313b can be removed from the positioning holes 312 of the base 311 to complete the separation of the first side frames 313a and the second side frames 313b from the base 311.

As shown in fig. 3, after the first side frame 313a and the second side frame 313b of the external structure 310 are assembled with the base 311, the first locking mechanism 317a and the second locking mechanism 317b on the adjacent first side frame 313a and second side frame 313b can be connected and locked to complete the connection and fixation between the first side frame 313a and the second side frame 313b, or the first locking mechanism 317a and the second locking mechanism 317b on the adjacent first side frame 313a and second side frame 313b can be unlocked to complete the separation between the first side frame 313a and the second side frame 313 b.

As shown in fig. 5, after the first side frame 313a, the second side frame 313b, the base 311, and all the adjacent first side frames 313a and second side frames 313b of the external structure 310 are installed or connected, the two first cross beams 314a and the two second cross beams 314b of all the first side frames 313a and the second side frames 313b are assembled into the air inlet 330 of the paint mist separating unit 300, and the space enclosed by the base 311, the first side frames 313a and the second side frames 313b is the accommodating portion 350 of the paint mist separating box 320.

As shown in fig. 6 and 7, the paint mist separator 320 has a housing 321, an air flow inlet 322, an air flow outlet 323, and a separating structure 324. The separating structure 324 in fig. 7 is only illustrated, the separating structure 324 may be a labyrinth paint mist separating structure including an upper portion, and a multi-layer bent filtering material at a lower portion for increasing a filtering area, or may be composed of the labyrinth paint mist separating structure at the upper portion, or may be composed of the multi-layer bent filtering material at the lower portion, or the labyrinth paint mist separating structure at the lower portion, and the separating structure formed by the multi-layer bent filtering material is at the upper portion, or the two structures are arranged in an up-and-down staggered manner, the material of the labyrinth paint mist separating structure may be a paper material, such as a cardboard, or a disposable material, and the multi-layer bent filtering material may be a multi-layer honeycomb-hole paper and/or fiber filtering sheet, etc.

The labyrinth paint mist separating structure of the upper part may be formed by vertically staggered separating materials with U-shaped cross sections, the U-shaped separating materials on the same layer are horizontally arranged at intervals, the openings of the U-shaped separating materials face the airflow inlet 322 upwards, the multi-layer bent filtering materials of the lower part may be formed by bending available air-permeable filtering materials for multiple times in a U shape, the filtering materials may be regarded as formed by splicing multiple U-shaped parts, the opening directions of adjacent U-shaped parts are opposite, the opening of one U-shaped part faces the airflow inlet 322, and the other adjacent U-shaped part faces the airflow outlet 323, and other separating structures may be adopted, but are not limited to this.

As shown in fig. 2, after the paint mist separating box 320 is placed in the external structure 310, the housing 321 of the paint mist separating box 320 is connected to the upper surface plane of the base 311 of the external structure 310 and the sides of the first beam 314a of the first side frame 313a and the second beam 314b of the second side frame 313b to form a sealing structure, or an adhesive tape may be attached to the connection thereof to increase the sealing effect.

The outer structure 310 is made of a hard high-strength material, such as one or more of a metal material, a plastic material, and a wood material, wherein the metal material may be steel, alloy, and the like. The paint mist separation box 320 is made of one or more materials selected from paper materials, wood materials and plastic materials.

Referring to fig. 11 to 13, an embodiment of the paint mist separating apparatus 200 of the exemplary embodiment will be described.

As shown in fig. 11 to 13, the paint mist separating apparatus 200 provided in this embodiment is used for separating the over-sprayed paint mist generated in the spraying process, and includes a diversion cavity 210, where a paint spraying chamber is connected above the diversion cavity 210, and is used for guiding the air flow containing the over-sprayed paint mist into the paint mist separating unit 300. Three inlet docking devices 211 are provided between the guiding chamber 210 and the paint mist separating unit, and when the paint mist separating unit 300 is located at the operating position, the inlet docking devices 211 can be connected with or disconnected from the inlet 330 of the paint mist separating unit 300.

As shown in fig. 11 to 13, the paint mist separating apparatus 200 of the present embodiment further includes three paint mist separating units 300, which receive the air flow guided by the guiding chamber 210 and separate the paint mist passing through the air flow, and as a concrete implementation, the paint mist separating units 300 are not limited to this number, and are configured according to the requirement, and the inlet docking device 211 and the outlet docking device 221 mentioned below are configured according to the number of the paint mist separating units 300.

As shown in fig. 11 to 13, the paint mist separator 200 of the present embodiment further includes an exhaust chamber 220, wherein the exhaust chamber 220 is disposed below the paint mist separator 300 and receives and guides the airflow after the paint mist is separated. The exhaust chamber 220 has three corresponding outlet interfaces 221, and when the three paint mist separation units 300 are in the operating position, the outlet interfaces 221 can be connected to or disconnected from the outlets 340 of the paint mist separation units 300.

The inlet docking device 211 and the outlet docking device 221 may be implemented by interface docking devices available in the prior art, and when the paint mist separation unit is pushed to a docking position between the inlet docking device 211 and the outlet docking device 221, the inlet docking device 211 and the outlet docking device 221 can be hermetically docked, and when the paint mist separation unit needs to be replaced, the paint mist separation unit can be pulled out from between the inlet docking device 211 and the outlet docking device 221. Such as by using a radial compression seal interface or the like.

As shown in fig. 11 to 13, the paint mist separator 200 of the present embodiment further includes a guiding mechanism 230 for guiding and positioning the paint mist separator 300 when moving to or from the operating position. The guiding mechanism 230 is located below the base 311 of the paint mist separating unit 300 in the operating position, and preferably comprises two guiding units located outside the outlet docking unit 221 and the row of cavities 220, respectively, and a row of rollers may be placed on the surface of the guiding mechanism 230 to facilitate the movement of the paint mist separating unit 300 on the surface of the guiding mechanism 230.

As shown in fig. 11 to 13, the paint mist separator 200 of the present embodiment further includes a transportation mechanism 240, and the transportation mechanism 240 may be a manually pushed or automatically operated cart, and has a traveling wheel below for transporting the paint mist separator 300 from a specific position to the guide mechanism 230, or receiving the paint mist separator 300 from the guide mechanism 230 and transporting to a specific position.

The transportation mechanism 240 has a space for placing the paint mist separation unit 300, and the upper surface of the transportation mechanism may have rows of rollers, so that the paint mist separation unit 300 can move on the surface of the transportation mechanism 240. When the paint mist separating unit 300 is located on the transporting mechanism 240 or the guiding mechanism 230, the relative heights of the two are the same.

Referring to fig. 14, an implementation of the spray coating device 100 of the exemplary embodiment is explained.

As shown in fig. 14, the spraying apparatus 100 of the present embodiment is used for separating the overspray mist generated during the spraying process, and comprises a pressure equalizing chamber 110, a spraying chamber 120, and a mist separating device 200 from top to bottom. Clean air flow is delivered from the plenum 110 to the spray booth 120, and atomized paint is sprayed into particles by an atomizing device 122 in the spray booth 120, where the atomizing device 122 may be a manually operated spray gun or a relatively high automated robotic arm with an atomizer. A portion of the paint particles move forward and adhere to the workpiece 121 being painted, which workpiece 121 may be an automobile body, a process known as painting.

A portion of the paint particles is not adsorbed by the workpiece surface but is carried away by the air flow fed from the pressure equalizing chamber, and such carried-away paint particles are referred to as "overspray mist". The air flow mixed with the overspray mist is sent from the spray booth 120 to the diversion chamber 210 of the mist separation apparatus 200 and then to the mist separation unit 300, where the overspray mist in the air flow is adsorbed by the separation structure. The relatively clean air flow is sent into the exhaust cavity to complete the air flow separation function with the paint mist.

An embodiment of an exemplary embodiment of a method for separating overspray mist from an air stream is described with reference to fig. 11 to 14.

As shown in fig. 11 to 14, the method for separating paint mist passing through the airflow by the paint mist separator 200 provided in this embodiment includes the following steps:

a) three paint mist separating units 300 for guiding the air flow with the paint mist sprayed thereon from the flow guide chamber 210 of the paint mist separating device 200 to be supplied to the paint mist separating device 200, the paint mist separating units 300 being arranged in respective operating positions in the paint mist separating device 200;

b) separating the overspray mist from the air flow with the overspray mist at the mist separation box 320 of the mist separation unit 300;

c) after the paint mist separation box 320 of the paint mist separation unit 300 reaches the paint mist loading limit, the paint mist separation unit 300 is moved out of the operating position to the transport mechanism 240, and the paint mist separation unit 300 with a new paint mist separation box 320 is moved into the operating position from the transport mechanism 240, so that the replacement of the paint mist separation unit 300 is completed;

d) the first side frame 313a and the second side frame 317b of the paint mist separation unit 300 are unlocked, the first side frame 313a and the second side frame 313b are removed from the base 311, and the paint mist separation box 320 reaching the loading limit of the paint mist is replaced by a new paint mist separation box 320; and then the first side frame 313a and the second side frame 313b are installed on the base 311, and the first locking mechanism 317a and the second locking mechanism 317b are connected and locked, thereby completing the replacement of the paint mist separation box 320.

While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other embodiments without departing from the spirit or essential characteristics thereof;

the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The paint mist separation unit is characterized by being used for separating and discharging the air flow from top to bottom containing the paint mist from the paint spraying chamber, and is of a split structure and comprises a recycled external structure and a disposable and removable paint mist separation box matched with the external structure; the top of the outer structure is provided with an inlet for receiving airflow, and the bottom of the outer structure is provided with an outlet for discharging airflow; the external structure consists of a base with an outlet formed inside and a plurality of side frames vertically arranged on the upper surface of the base, the side frames are detachably arranged between the outlet and the outer edge of the base, the side frames are sequentially connected in a head-to-tail manner, and a space for accommodating the paint mist separation box is enclosed between the upper surface of the base and the inner side surfaces of the side frames; the paint mist separation box comprises a shell and a paint mist separation structure arranged in the shell, wherein the top of the shell corresponds to an airflow inlet of the inlet, and the bottom of the shell is provided with an airflow outlet corresponding to the outlet.

2. The paint mist separating unit as claimed in claim 1, wherein the space for accommodating the paint mist separating box is a rectangular space, and correspondingly, the paint mist separating box is a box body with a rectangular structure.

3. The paint mist separating unit as claimed in claim 1 or 2, wherein the bottom of the paint mist separating box is supported at the bottom by the base in contact with the upper surface of the base, and is in contact with the inner surface of the side frame, being restrained at the outside by the side frame.

4. The paint mist separation unit as claimed in claim 3, wherein the outer structure is a rectangular structure as a whole, the number of the side frames is four, each of the side frames is composed of a cross beam at a top and at least three support legs spaced apart from each other in a width direction and arranged perpendicular to the base, the top of the support legs is connected to the cross beam, and the bottom of the support legs is provided with a positioning pin; and a positioning hole matched with the positioning pin is formed on the outer side of the outlet on the base.

5. The paint mist separator unit as claimed in claim 4, wherein the top end of the paint mist separator box is higher than the bottom end of the cross member and the paint mist separator box is sealed from the external structure to prevent the air flow to be separated from escaping between the bottom of the cross member and the support legs.

6. The paint mist separating unit as claimed in claim 4, wherein the cross member of one of the two adjacent side frames has a first locking mechanism thereon, and the cross member of the other side frame has a second locking mechanism thereon, the second locking mechanism being capable of being engaged with or disengaged from the first locking mechanism by rotation to thereby connect or disconnect the two adjacent side frames.

7. The paint mist separator unit according to claim 6 wherein said second locking mechanism is a rotatable L-shaped locking plate and said first locking mechanism is an L-shaped plate, said L-shaped plate being mounted on a side of said cross member and forming a locking slot therebetween for engaging said L-shaped locking plate.

8. The paint mist separation unit of claim 1 wherein the outer structure has a top end adapted to mate with an inlet docking means at the bottom of the diversion chamber of the paint mist separation device and a bottom end adapted to mate with an outlet docking means at the top of the exhaust chamber of the paint mist separation device.

9. The paint mist separation unit as claimed in claim 1, wherein the paint mist separation structure comprises a labyrinth type paint mist separation structure and/or a multi-layer bent sheet-shaped filter material separation structure;

the labyrinth type paint mist separation structure is formed by vertically arranging separation materials with U-shaped cross sections in a staggered manner, the U-shaped separation materials on the same layer are horizontally arranged at intervals, the openings of the U-shaped separation materials are upward, and the U-shaped separation materials face the airflow inlet;

the multi-layer bent sheet-shaped filter material separation structure is formed by bending a filter material with air permeability and preset thickness in a U shape for multiple times, and the opening directions of adjacent U-shaped parts are opposite.

10. The paint mist separation unit of claim 1, wherein the outer structure is made of a material selected from one or more of metal, plastic, wood material; the paint mist separation box is made of one or more materials selected from paper materials, wood materials and plastics.

11. Paint mist separation device, characterized in that it comprises a paint mist separation unit according to any one of claims 1-10, a flow guide chamber and a discharge chamber, the flow guide cavity is arranged at the bottom of the spray booth, the exhaust cavity is positioned below the flow guide cavity and is separated from the flow guide cavity along the vertical direction, the paint mist separation unit is positioned between the diversion cavity and the exhaust cavity, the paint mist separation unit is a replaceable paint mist separation module, is arranged at the operation position between the diversion cavity and the air exhaust cavity when in work, connects the diversion cavity with the air exhaust cavity, therefore, an air flow channel is formed between the diversion cavity and the air exhaust cavity, and air flows from top to bottom flow through the air exhaust channel and then is exhausted from the air exhaust cavity after the air flows which are guided from the diversion cavity and come from the paint spraying chamber and contain paint mist from top to bottom are separated and processed by the paint mist separation unit.

12. The paint mist separator according to claim 11 wherein the bottom of the diversion chamber is provided with an inlet docking means for sealing engagement with the inlet of the paint mist separator unit when the paint mist separator unit is in the operational position; the top of the exhaust cavity is provided with an outlet butt joint device which is used for being in sealing connection with an outlet of the paint mist separation unit when the paint mist separation unit is located at the operation position.

13. The paint mist separator according to claim 12, including guide means including two widthwise opposed spaced apart guide units for guiding the paint mist separator when moved to or from the operating position; one guide unit is disposed at one side of the exhaust chamber, and the other guide unit is disposed at the opposite side of the exhaust chamber.

14. The paint mist separator according to claim 13, comprising a conveyor mechanism comprising a manually propelled or automatically operated cart for transporting the paint mist separator unit from the predetermined position to the guide mechanism or receiving the paint mist separator unit from the guide mechanism and transporting to the predetermined position.

15. The spraying equipment is characterized by comprising the paint mist separating device, the pressure equalizing chamber and the paint spraying chamber of any one of claims 11 to 14, wherein the pressure equalizing chamber, the paint spraying chamber and the paint mist separating device are sequentially connected from top to bottom, the spraying equipment is arranged in the paint spraying chamber, the pressure equalizing chamber is used for sending clean airflow into the paint spraying chamber, a flow guide cavity of the paint mist separating device is connected with the bottom of the paint spraying chamber, and the airflow which is guided from the paint spraying chamber by the flow guide cavity and contains paint mist from top to bottom is separated by the paint mist separating device and then is discharged by an exhaust cavity.