Large cyclone secondary recovery system for powder spraying room

Abstract

The utility model discloses a large cyclone secondary recovery system for a powder spraying room, which comprises a powder spraying room, a plurality of spray guns are arranged in the powder spraying room, and the spray guns are connected with a powder supply center; the bottom of the powder spraying chamber is connected with an exhaust pipe, and the exhaust pipe is sequentially connected with a cyclone separator and a rear filter; a pulse purging assembly is arranged at the bottom of the powder spraying chamber and comprises a pulse type fan, a purging main pipeline and a plurality of purging branch pipelines, one end of the purging main pipeline is connected with the pulse type fan, the other end of the purging main pipeline is connected with the purging branch pipelines, air nozzles are formed in the output ends of the purging branch pipelines, and the air nozzles are wound around the edge of the bottom of the powder spraying chamber. The pulse blowing assembly is arranged at the bottom of the powder spraying room, powder at the bottom of the powder spraying room can be blown up regularly, the powder can be conveniently fed into the cyclone separator through the exhaust pipe, it is guaranteed that the powder at the bottom of the powder spraying room is recycled in time, and therefore the dust content in the powder spraying room is reduced, and the burning explosion risk is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coating equipment, in particular to a large cyclone secondary recovery system for a powder spraying room. Background Art

[0002] Electrostatic powder spraying is an important construction process with the fastest development in powder coating. Its working principle is: a high-voltage corona discharge electric field is formed between the spray gun and the workpiece. When the powder particles are sprayed from the spray gun through the discharge area, they collect a large number of electrons and become negatively charged particles. Under the action of electrostatic attraction, they are adsorbed to the positively charged workpiece. When the powder adheres to a certain thickness, the effect of like charges repelling each other occurs, and the powder can no longer be adsorbed, so that the thickness of the powder layer in each part is uniform, and then after heating and baking and curing, the powder layer is leveled to form a uniform film layer.

[0003] The powder spraying room is one of the main equipment for electrostatic powder spraying. The powder spraying room needs to maintain a stable air flow and cleanliness. The workpiece is sprayed in the powder spraying room, and the excess powder in the spraying process falls into the powder spraying room. Most of the powder will be recovered and processed by the exhaust pipe to achieve resource recycling. However, a small part of the powder will still sink to the bottom of the powder spraying room and is not easily sucked away by the exhaust pipe, resulting in excessive powder content in the powder spraying room. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a large cyclone two-level recovery system for a powder spraying room, which can ensure that the powder at the bottom of the powder spraying room is recovered in time.

[0005] To this end, the technical solution of the utility model is: a large cyclone secondary recovery system for a powder spraying room, comprising a powder spraying room, wherein a plurality of spray guns are arranged in the powder spraying room, and the spray guns are connected to a powder supply center; an exhaust pipe is connected to the bottom of the powder spraying room, and the exhaust pipe is connected to a cyclone separator and a post-filter in sequence; a pulse purge assembly is arranged at the bottom of the powder spraying room, comprising a pulse fan, a purge main line and a plurality of purge branch lines, one end of the purge main line is connected to the pulse fan, and the other end is connected to the purge branch line, and an air jet is arranged at the output end of the purge branch line, and the air jet is arranged around the bottom edge of the powder spraying room.

[0006] On the basis of the above scheme and as a preferred scheme of the above scheme: a powder collecting hopper is provided below the cyclone separator, the outlet of the powder collecting hopper is connected to a powder return pump, and the other end of the powder return pump is connected to a powder supply barrel of a powder supply center.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: a centrifugal fan is provided above the rear filter, and the centrifugal fan is connected to the upper end of the cyclone separator through an air duct; a filter element is provided in the middle of the rear filter, and a micro powder collection bucket is provided below the filter element.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: an explosion-proof valve is provided on the pipeline between the cyclone separator and the rear filter, and a flameless explosion relief valve is provided on the side of the rear filter.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: an explosion-proof spray system is arranged inside the powder spraying chamber, including a flame detector and a spray pipe, and a plurality of spray heads are arranged on the spray pipe.

[0010] During operation, the spray gun in the powder spraying room sprays out coating powder, and part of the powder is adsorbed by the workpiece. The centrifugal fan starts to work, and the exhaust pipe is in a negative pressure state. The part of the powder that does not reach the workpiece is taken to the cyclone separator by the exhaust pipe. In the cyclone separator, the larger powder particles are separated and fall into the powder collection bucket. The powder in the powder collection bucket is sucked into the powder supply barrel of the powder supply center by the powder return pump, forming a closed-loop circulation system, thereby realizing the recycling of powder.

[0011] The micro powder (particle size less than 10um) not separated in the cyclone separator is sucked into the post-filter, and the filter element in the post-filter filters the micro powder, and the micro powder falls into the micro powder collection bucket.

[0012] At the same time, the pulse purge component in the powder spraying room is started. The pulse fan is a fan controlled by PLC pulse. The airflow enters the purge main line and the purge branch line in turn through the fan, and is finally blown out in the form of a jet outlet. The jet outlet faces the bottom of the powder spraying room, which can blow up the dust at the bottom of the powder spraying room, making it easier for it to be adsorbed by the exhaust pipe.

[0013] Compared with the prior art, the beneficial effect of the utility model is that a pulse purge component is arranged at the bottom of the powder spraying room, so that the powder at the bottom of the powder spraying room can be blown up regularly, so that it is convenient to be sent into the cyclone separator through the exhaust pipe to ensure that the powder at the bottom of the powder spraying room is recovered in time, thereby reducing the dust content in the powder spraying room and reducing the risk of combustion and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the powder spraying room of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the cyclone separator of the utility model;

[0018] Figure 4 It is a structural schematic diagram of the rear filter of the utility model.

[0019] Marked in the figure are: powder spraying room 1, spray gun 2, powder supply center 3, exhaust pipe 4, air jet 5, flame detector 6, spray head 7, cyclone separator 8, powder collection bucket 9, powder return pump 10, after filter 11, centrifugal fan 12, explosion-proof valve 13, micro powder collection barrel 14, flameless explosion relief valve 15. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.

[0022] See the attached drawings. The large cyclone secondary recovery system of this embodiment includes a powder spraying room 1, in which a plurality of spray guns 2 are arranged, and the spray guns are connected to the powder supply barrel of the powder supply center 3, and can extract coating powder from the powder supply barrel for powder spraying operation.

[0023] The bottom of the powder spraying room 1 is a conical structure, and an outlet is provided at the lowest point, and the outlet is connected to the exhaust pipe 4. Under normal circumstances, the powder will be adsorbed by the negative pressure of the exhaust pipe 4, but the powder is relatively light and may accumulate at the bottom of the powder spraying room 1 and is not easy to slide off. Therefore, a pulse purge component is provided in the powder spraying room.

[0024] The pulse purge assembly includes a pulse blower, a purge main line and a plurality of purge branch lines. One end of the purge main line is connected to the pulse blower, and the other end is connected to the purge branch line. The output end of the purge branch line is provided with an air jet 5, which is arranged around the bottom edge of the powder spraying room 1. The pulse blower is a blower controlled by a PLC pulse. The airflow enters the purge main line and the purge branch line in sequence through the blower, and finally blows out through the air jet 5. The air jet 5 faces the bottom of the powder spraying room 1, and can blow up the dust that falls on the bottom of the powder spraying room 1, so that it is convenient to be adsorbed by the exhaust pipe 4.

[0025] In order to further enhance the explosion-proof effect, an explosion-proof spray system is provided inside the powder spraying room 1, including a flame detector 6 and a spray pipe, on which a plurality of spray heads 7 are provided. When the flame detector detects sparks, smoke, etc. in the powder spraying room, the spray system is activated and the spray head sprays water to extinguish the fire.

[0026] The exhaust pipe 4 is connected to the cyclone separator 8 , a powder collecting hopper 9 is provided below the cyclone separator 8 , an outlet of the powder collecting hopper 9 is connected to a powder return pump 10 , and the other end of the powder return pump 10 is connected to a powder supply barrel of the powder supply center 3 .

[0027] The cyclone separator 8 is connected to the centrifugal fan 12 above the rear filter 11 through an air duct, and an explosion-proof valve 13 is provided on the pipeline between the cyclone separator 8 and the rear filter 11; a filter element is provided in the middle of the rear filter 11, a micropowder collection barrel 14 is provided below the filter element, and a flameless explosion relief valve 15 is provided on the side of the rear filter 11.

[0028] During operation, the spray gun 2 in the powder spraying room 1 sprays paint powder, part of the powder is adsorbed by the workpiece, the centrifugal fan 12 starts to work, the exhaust pipe 4 is in a negative pressure state, and part of the powder that has not reached the workpiece is brought to the cyclone separator 8 by the exhaust pipe 4. At the same time, the pulse purge component in the powder spraying room 1 starts to work, and the air jet 5 can blow up the dust that has fallen on the bottom of the powder spraying room 1, so that it is convenient for it to be adsorbed by the exhaust pipe 4.

[0029] In the cyclone separator 8, larger powder particles are separated and fall into the powder collecting hopper 9. The powder in the powder collecting hopper 9 is sucked into the powder supply barrel of the powder supply center 3 by the powder return pump 10, forming a closed-loop circulation system, thereby realizing the recycling of powder.

[0030] The fine powder (with a particle size of less than 10 μm) that is not separated in the cyclone separator 8 is sucked into the post-filter 11 , and the filter element in the post-filter filters the fine powder, and the fine powder falls into the fine powder collection bucket 14 .

[0031] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A large cyclone secondary recovery system for a powder spraying room, comprising a powder spraying room, wherein a plurality of spray guns are arranged in the powder spraying room, and the spray guns are connected to a powder supply center; an exhaust pipe is connected to the bottom of the powder spraying room, and the exhaust pipe is connected to a cyclone separator and a post filter in sequence; the characteristics are: A pulse purge assembly is provided at the bottom of the powder spraying chamber, comprising a pulse blower, a main purge line and a plurality of branch purge lines. One end of the main purge line is connected to the pulse blower, and the other end is connected to the branch purge line. An air jet is provided at the output end of the branch purge line, and the air jet is arranged around the bottom edge of the powder spraying chamber.

2. A large cyclone secondary recovery system for a powder spraying room as claimed in claim 1, characterized in that: A powder collecting hopper is provided below the cyclone separator, an outlet of the powder collecting hopper is connected to a powder return pump, and the other end of the powder return pump is connected to a powder supply barrel of a powder supply center.

3. A large cyclone secondary recovery system for a powder spraying room as claimed in claim 1, characterized in that: A centrifugal fan is arranged above the rear filter, and the centrifugal fan is connected to the upper end of the cyclone separator through an air duct; a filter element is arranged in the middle of the rear filter, and a micro powder collection bucket is arranged below the filter element.

4. A large cyclone secondary recovery system for a powder spraying room as claimed in claim 1, characterized in that: An explosion-proof valve is arranged on the pipeline between the cyclone separator and the rear filter, and a flameless explosion relief valve is arranged on the side of the rear filter.

5. A large cyclone secondary recovery system for a powder spraying room as claimed in claim 1, characterized in that: An explosion-proof spray system is arranged inside the powder spraying room, comprising a flame detector and a spray pipe, and a plurality of spray heads are arranged on the spray pipe.

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