Electrostatic plastic spraying equipment based on safe and environmentally friendly design

Abstract

The utility model relates to a plastic dust collection and safe production technical field, concretely relates to a static electrostatic spraying equipment based on safe environmental protection design, including electrostatic powder spraying device, powder spraying chamber and dust chamber, its characterized in be that powder spraying chamber and dust chamber intercommunication arrangement, powder spraying chamber bottom is provided with automatic ash removal device, the filter cartridge is installed in dust chamber, the fan that exhausts to dust chamber outside is installed to dust chamber rear side, dust chamber below with its intercommunication arrangement has lock gas ash removal device, is configured with monitoring interlock equipment group and explosion -proof control explosion device in powder spraying chamber and dust chamber. The equipment satisfies dust removal equipment environmental protection and safety requirement, can carry out effective cleaning to the dust formed when replacing filter cartridge, shortens dust filtration technological process simultaneously, solves the problem that the land area is big that non - integrated dust removal process brings, and carries out individualized dust explosion venting design according to different kinds plastic powder explosion parameter and the structure space of equipment is different.

Description

Technical Field

[0001] This utility model relates to the field of powder coating dust collection and safe production technology, specifically to an electrostatic powder coating equipment based on a safe and environmentally friendly design. Background Technology

[0002] Electrostatic powder coating is a surface treatment technology widely used in industrial fields. Its core principle is to uniformly spray powder coating onto the workpiece surface through electrostatic adsorption, followed by high-temperature curing to form a coating. It is applied across various industries, including anti-corrosion and decorative coatings for metal parts such as car body frames, engine components, wheel hubs, and chassis in the automotive industry; anti-rust coatings for equipment surfaces in the home appliance industry; anti-rust coatings for metal furniture and building materials; and insulating protective layers for cabinets and distribution boxes in the electronics and electrical industry. The main components of the powders used include epoxy resin, phenolic resin, and polyester polymers. The particle size distribution is typically at the micrometer level, but can reach the nanometer level under special processing conditions. In relevant dust explosion parameter specifications and laboratory dust explosiveness tests, most powders are classified as explosive dust, possessing a relatively low minimum ignition energy and high explosion sensitivity. Furthermore, their maximum explosion pressure and maximum explosion pressure rise index are also relatively large, indicating a high severity of explosion consequences. The five basic conditions for a dust explosion are combustible dust, an ignition source, a relatively confined environment, an oxidizer, and a certain concentration of dust cloud. During electrostatic powder coating, a large amount of powder is generated, forming a dust cloud that can reach the lower explosive limit of the powder. Furthermore, the process involves electrostatic spray guns, fans, and other electrical equipment, making static electricity and electrical sparks common ignition sources, thus increasing the risk of dust explosions. Current electrostatic powder coating equipment faces several problems: firstly, as environmentally friendly equipment, its dust collection efficiency cannot be guaranteed; secondly, the aforementioned dust explosion risks cannot be effectively eliminated or controlled, resulting in significant safety and environmental drawbacks.

[0003] Specifically, this mainly includes the following aspects. First, product design and manufacturing lack standards and specifications, and there are no corresponding technical bases, quantitative indicators, and methods for acceptance testing. For example, indicators such as dust capture efficiency and airflow monitoring lack specific experimental testing methods and data support, resulting in discrepancies between the relevant parameter values ​​in the factory documents and actual operation, even though the values ​​are high. This mainly includes the design of dust removal methods for high-efficiency powder coating equipment, simulation of equipment airflow organization methods, and comparison of various design indicators with actual factory conditions. Second, the equipment lacks systematic safety monitoring measures. For example, most equipment does not have explosion control designs such as explosion venting based on different explosion consequences parameters of plastic powder. The average concentration of suspended powder in the powder coating chamber cannot be detected, and there are problems with the incorrect installation of fire source detection and extinguishing devices. Relevant environmental protection manufacturers have a relatively shallow understanding of safety requirements. This mainly includes the design of intrinsically safe system testing methods for equipment and compliance with national requirements for online monitoring of parameters of such processes and equipment. Third, currently, electrostatic powder coating equipment cannot implement measures for timely transfer of plastic powder after powder coating, which easily leads to a large accumulation of dust and creates significant hidden dangers. This mainly includes equipment and functions for automatic powder cleaning and timely transfer based on the amount of powder sprayed and the amount accumulated; fourth, most powder coating powder needs to be recycled and reused, so it is necessary to design a dust collection method specifically for normal operation and filter replacement to ensure that the powder can be safely and recycled to the greatest extent. Utility Model Content

[0004] To address the aforementioned technical problems in the existing technology, this utility model proposes an electrostatic powder coating equipment based on a safe and environmentally friendly design, the specific technical solution of which is as follows:

[0005] An electrostatic powder coating equipment based on a safe and environmentally friendly design includes an electrostatic powder spraying device, a powder spraying chamber, and a dust removal chamber. The powder spraying chamber and the dust removal chamber are connected. An automatic dust removal device is installed at the bottom of the powder spraying chamber. A filter cartridge is installed inside the dust removal chamber. A fan that exhausts air to the outside of the dust removal chamber is installed at the rear of the dust removal chamber. An airlock ash discharge device is installed below the dust removal chamber and connected to it. Monitoring interlocking equipment groups and explosion-proof and explosion-control devices are configured in the powder spraying chamber and the dust removal chamber.

[0006] Furthermore, the automatic dust removal device includes a motor, a linkage shaft, a dust scraper, a dust collection bin, a dust suction pump, and a powder recovery device. The motor controls the dust scraper to reciprocate back and forth through the linkage shaft. The dust scraper scrapes the dust at the bottom of the powder spraying chamber into the dust collection bin, and the dust suction pump transfers the dust in the dust collection bin to the powder recovery device.

[0007] Furthermore, the dust removal chamber includes a front cleanroom and a rear cleanroom, with a baffle between them. The baffle has an opening at its upper and lower parts, respectively, and a pneumatic switch valve is installed at each of the upper and lower openings, controlling their opening and closing. A baffle is provided on the side of the front cleanroom that connects to the powder spraying chamber. The lower part of the front cleanroom is connected to the dust collection bin, and the lower part of the rear cleanroom is connected to the airlock ash discharge device. The filter cartridge is installed in both the front and rear cleanrooms. The fan is located in the rear cleanroom.

[0008] Furthermore, the monitoring and interlocking equipment group includes an opening face wind speed monitoring device, a flame detection and interlocking device, a differential pressure sensor and interlocking device, a dust accumulation thickness monitoring and interlocking device, a surface temperature monitoring device, a dust concentration monitoring device, and an ambient humidity monitoring device.

[0009] Furthermore, the differential pressure sensor and interlocking module are configured on the filter cartridge side, including a pulse controller and a differential pressure sensor. The pulse controller is located above the filter cartridge, and the differential pressure sensor is located inside and outside the filter cartridge and interlocked with the pulse controller. The pulse controller receives the signal from the differential pressure sensor, and when the differential pressure exceeds a preset threshold range, the pulse controller controls the pulse backflushing to remove dust from the outer surface of the filter cartridge.

[0010] Furthermore, the opening face wind speed monitoring device is installed in the powder spraying chamber to monitor the wind speed at the opening face of the baffle.

[0011] Furthermore, the powder accumulation thickness monitoring and interlocking device is installed at the bottom of the powder spraying chamber and is signal-connected to the automatic dust removal device, specifically interlocked with the dust removal frequency of the dust scraper.

[0012] Furthermore, the surface temperature monitoring device is installed at the airlock ash discharge device to monitor for dust spontaneous combustion that may be caused by abnormal temperature rise.

[0013] Furthermore, the explosion-proof and explosion-control device includes an explosion venting system and an explosion-proof lighting fixture. The explosion venting system is installed in the dust removal chamber, and the explosion-proof lighting fixture is installed in the powder spraying chamber.

[0014] Furthermore, the electrostatic powder spraying device includes a powder supply tank, a powder pump, a powder conveying pipe, and a powder spraying gun. The powder is drawn from the powder supply tank by the powder pump and enters the powder spraying gun through the powder conveying pipe. By setting relevant parameters such as atomization, powder output, voltage, and current, the powder spraying operation is performed in the powder spraying chamber.

[0015] Furthermore, it also includes a base, on which the powder spraying chamber and dust removal chamber are fixed, and the bottom of the base is provided with casters and hinge fasteners.

[0016] Furthermore, the powder spraying chamber and dust removal chamber are equipped with observation ports, cleaning ports, and operation control panels.

[0017] Beneficial Effects: This equipment is designed and invented around three aspects to meet the environmental protection and safety requirements of dust removal equipment. First, the dust filtration structure design is based on the powder coating process. This is achieved through the design of front and rear clean chambers, which effectively cleans the dust generated during filter cartridge replacement, shortens the dust filtration process, and solves the problem of large footprint associated with non-integrated dust removal processes. Second, the anti-dust accumulation design is based on dust explosion prevention. This is achieved through a scraper design that adjusts according to time or dust accumulation thickness parameters, and a powder hopper and pump transfer design, solving the problem of large powder usage and easy accumulation in powder coating equipment. Finally, the explosion control design is based on the structure and powder parameters. Personalized dust explosion relief designs are implemented according to the different explosion parameters of different types of powder and the different structural spaces of the equipment. Furthermore, destructive testing is conducted to support the explosion-proof design in case of potential explosions under extreme conditions. Attached Figure Description

[0018] Figure 1 This is a side view of the powder spraying chamber and dust removal chamber of the electrostatic powder coating equipment in this embodiment;

[0019] Figure 2 This is a schematic diagram of the electrostatic powder spraying device in this embodiment;

[0020] Figure 3 This is a schematic diagram of the other side of the dust removal chamber and powder spraying chamber and the automatic dust removal device in this embodiment;

[0021] Figure 4 This is a schematic diagram showing the location of the explosion venting system in this embodiment;

[0022] Figure 5 This is a top view of the powder spraying chamber and dust removal chamber in this embodiment;

[0023] In the diagram, 1-powder spraying chamber, 2-automatic dust removal device, 3-filter cartridge, 4-airlock dust discharge device, 5-dust hopper, 6-fan, 7-powder supply bucket, 8-powder pump, 9-powder conveying pipe, 10-powder spraying gun, 11-motor, 12-linkage shaft, 13-powder scraper, 14-dust collection bin, 15-powder suction pump, 16-controller, 17-powder recovery device, 18-front cleanroom, 19-rear cleanroom, 20-baffle, 21-upper opening, 22-lower opening, 23-baffle plate, 24-flame detection and interlocking equipment, 25-explosion relief system, 26-explosion-proof lighting fixture, 27-pulse controller. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] like Figure 1As shown in the figure, this embodiment of an electrostatic powder coating equipment based on a safe and environmentally friendly design includes a machine frame and an electrostatic powder coating device. A powder coating chamber 1 and a dust removal chamber are arranged on the frame. The powder coating chamber 1 and the dust removal chamber are equipped with observation ports, cleaning ports, and operation control panels. The electrostatic powder coating device operates within the powder coating chamber 1. The powder coating chamber 1 and the dust removal chamber are connected. An automatic dust removal device 2 is installed at the bottom of the powder coating chamber 1, which mainly cleans the accumulated powder within the powder coating chamber 1 at regular intervals. The dust removal chamber is equipped with a filter cartridge 3, and a fan 6 that exhausts gas to the outside of the dust removal chamber is installed at the rear of the dust removal chamber. An airlock ash discharge device 4 is connected to the bottom of the dust removal chamber, and an ash hopper 5 is connected below the airlock ash discharge device 4. A monitoring interlocking equipment group and an explosion-proof and explosion-control device are configured in the powder spraying chamber 1 and the dust removal chamber. The monitoring interlocking equipment group mainly monitors and controls the relevant parameters such as wind speed and concentration in the powder spraying chamber 1 and the dust removal chamber. The explosion-proof and explosion-control device mainly designs and installs explosion-proof and explosion-venting equipment for the powder spraying chamber 1 and the dust removal chamber based on the relevant explosion parameters of dust.

[0026] Specifically, such as Figure 2 As shown, the electrostatic powder spraying device includes a powder supply tank 7, a powder pump 8, a powder conveying pipe 9, and a powder spraying gun 10. Powder is drawn from the powder supply tank 7 by the powder pump 8 and enters the powder spraying gun 10 through the powder conveying pipe 9. By setting relevant parameters such as atomization, powder output, voltage, and current, the powder spraying operation is performed in the powder spraying chamber 1.

[0027] like Figure 3 As shown, the automatic dust removal device 2 includes a motor 11, a linkage shaft 12, a dust scraper 13, a dust collection bin 14, a dust suction pump 15, a controller 16, and a powder recovery device 17. The motor 11 controls the dust scraper 13 to reciprocate back and forth through the linkage shaft 12. The dust scraper 13 scrapes the dust deposited at the bottom of the powder spraying chamber 1 into the dust collection bin 14 according to a set reciprocating cycle. The dust in the dust collection bin 14 is transferred to the powder recovery device 17 by the dust suction pump 15. The controller 16 is installed on the outer wall of the powder spraying chamber 1 and is connected to the motor 11 for signal transmission. It mainly sets the dust scraping frequency. The mechanical reciprocating dust scraping frequency of the dust scraper 13 is set according to the dust accumulation thickness at the bottom of the powder spraying chamber 1 or the interval time. The material of the dust scraper 13 should be non-sparking material, and the bottom surface of the powder spraying chamber 1 should maintain a certain smoothness. The dust scraper 13 can clean the dust thoroughly during cleaning, ensuring that no dust accumulates at the bottom of the powder spraying chamber 1.

[0028] The dust removal chamber includes a front cleanroom 18 and a rear cleanroom 19. A baffle 20 is provided between the front cleanroom 18 and the rear cleanroom 19. The baffle 20 has an opening at its upper and lower parts, namely an upper opening 21 and a lower opening 22, respectively. A pneumatic switch valve is installed at each of the upper opening 21 and the lower opening 22, and the opening and closing are controlled by the respective pneumatic switch valve. A baffle 23 is provided on the side of the front cleanroom 18 that is connected to the powder spraying chamber 1. The lower part of the front cleanroom 18 is connected to the dust collection bin 14. The lower part of the rear cleanroom 19 is connected to the airlock ash discharge device 4. The filter cartridge 3 is installed in the front cleanroom 18 and the rear cleanroom 19. The fan 6 is located in the rear cleanroom 19. During normal dust removal operation, the lower opening 22 on the baffle 20 between the front cleanroom 18 and the rear cleanroom 19 is closed, and the upper opening 21 is open. Under the suction of the fan 6, the dust-laden airflow enters the front cleanroom 18, and the dust is filtered on the outer surface of the filter cartridge 3. The clean gas passes through the inside of the filter cartridge 3 and is finally discharged outside the equipment by the fan 6. When the filter cartridge 3 in the front cleanroom 18 is replaced, the lower opening 22 on the baffle 20 is opened and the upper opening 21 is closed. The dust-laden gas enters the rear cleanroom 19, and the dust is filtered on the outer surface of the filter cartridge 3. The clean gas passes through the inside of the filter cartridge 3 and is finally discharged outside the equipment by the fan 6, ensuring that dust does not escape when the filter cartridge 3 is replaced.

[0029] The monitoring and interlocking equipment group includes an opening face wind speed monitoring device, a flame detection and interlocking device 24, a differential pressure sensor and interlocking device, a dust accumulation thickness monitoring and interlocking device, a surface temperature monitoring device, a dust concentration monitoring device, and an ambient humidity monitoring device.

[0030] The opening face wind speed monitoring device is installed in the powder spraying chamber 1 to monitor the opening face wind speed of the baffle 23.

[0031] The flame detection and interlocking device 24 is installed in the dust removal room and interlocked with the fire water valve.

[0032] The differential pressure sensor and interlocking module are configured on the filter cartridge 3 side, including a pulse controller 27 and a differential pressure sensor, such as... Figure 5 As shown, the pulse controller 27 is located above the filter cartridge 3. The differential pressure sensor is located inside and outside the filter cartridge 3 and is interlocked with the pulse controller 27. The pulse controller 27 receives the signal from the differential pressure sensor. When the differential pressure exceeds the preset threshold range, the pulse controller 27 controls the pulse backflushing to remove dust from the surface of the filter cartridge 3. The installed baffle 23 prevents dust from escaping during the backflushing process. At the same time, its strength must meet certain explosion-proof requirements. If an explosion occurs inside the front clean room 18, it can effectively block the shock wave from harming people and will not become a weak point in the explosion venting.

[0033] The powder accumulation thickness monitoring and interlocking device is installed at the bottom of the powder spraying chamber 1 and is signal-connected to the automatic dust removal device 2, specifically interlocked with the dust removal frequency of the dust scraper 13.

[0034] The surface temperature monitoring device is installed at the airlock ash discharge device 4 to monitor dust spontaneous combustion that may be caused by abnormal temperature rise.

[0035] The dust concentration monitoring device is located in the powder spraying chamber 1 and is mainly used to monitor whether the dust cloud concentration exceeds 50% of its lower dust limit.

[0036] The environmental humidity monitoring device is located in the surrounding environment of the equipment and is mainly used to monitor whether the humidity in the equipment environment meets the standard requirements for humidity.

[0037] The explosion-proof and explosion-control device includes an explosion venting system 25 and an explosion-proof lighting fixture 26, such as Figure 5 As shown, the explosion venting system 25 is installed in the dust removal chamber, mainly to allow for the directional release of explosion pressure in the event of an explosion. The design of the explosion venting system 25 should be calculated based on different powder coating explosion parameters, equipment structure, and space size. The explosion-proof lighting fixture 26 is installed in the powder coating chamber 1 and needs to meet explosion-proof requirements.

[0038] The machine's overall frame can be fitted with a base, and the base can be fitted with casters and hinge fasteners to facilitate equipment movement and ease of use.

[0039] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly. In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0040] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Although the implementation process of this utility model has been described in detail above, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrostatic powder coating equipment based on a safe and environmentally friendly design, comprising an electrostatic powder spraying device, a powder spraying chamber (1), and a dust removal chamber, characterized in that, The powder spraying chamber (1) and the dust removal chamber are connected. An automatic dust removal device (2) is installed at the bottom of the powder spraying chamber (1). A filter cartridge (3) is installed in the dust removal chamber. A fan (6) that exhausts gas to the outside of the dust removal chamber is installed at the rear side of the dust removal chamber. An airlock ash discharge device (4) is installed below the dust removal chamber and connected to it. Monitoring interlocking equipment group and explosion-proof explosion control device are configured in the powder spraying chamber (1) and the dust removal chamber.

2. The electrostatic powder coating equipment as described in claim 1, characterized in that, The automatic dust removal device (2) includes a motor (11), a linkage shaft (12), a dust scraper (13), a dust collection bin (14), a dust suction pump (15), a controller (16), and a powder recovery device (17). The motor (11) controls the dust scraper (13) to reciprocate back and forth through the linkage shaft (12). The dust scraper (13) scrapes the dust at the bottom of the powder spraying chamber (1) into the dust collection bin (14). The dust in the dust collection bin (14) is transferred to the powder recovery device (17) through the dust suction pump (15). The controller (16) is set on the outer wall of the powder spraying chamber (1) and is connected to the motor (11) by signal.

3. The electrostatic powder coating equipment as described in claim 2, characterized in that, The dust removal chamber includes a front cleanroom (18) and a rear cleanroom (19). A baffle (20) is provided between the front cleanroom (18) and the rear cleanroom (19). The baffle (20) has an opening at the top and a bottom, namely an upper opening (21) and a lower opening (22). A pneumatic switch valve is installed at each of the upper opening (21) and the lower opening (22). The upper opening (21) and the lower opening (22) are controlled to open and close by their respective pneumatic switch valves. A baffle plate (23) is provided on the side of the front cleanroom (18) that is connected to the powder spraying chamber (1). The lower part of the front cleanroom (18) is connected to the dust collection bin (14). The lower part of the rear cleanroom (19) is connected to the airlock ash discharge device (4). The filter cartridge (3) is installed in the front cleanroom (18) and the rear cleanroom (19). The fan (6) is located in the rear cleanroom (19).

4. The electrostatic powder coating equipment as described in claim 3, characterized in that, The monitoring and interlocking equipment group includes an opening face wind speed monitoring device, a flame detection and interlocking device (24), a differential pressure sensor and interlocking device, a dust accumulation thickness monitoring and interlocking device, a surface temperature monitoring device, a dust concentration monitoring device, and an environmental humidity monitoring device.

5. The electrostatic powder coating equipment as described in claim 4, characterized in that, The differential pressure sensor and interlocking module are configured on the filter cartridge (3) side, including a pulse controller (27) and a differential pressure sensor. The pulse controller (27) is set above the filter cartridge (3), and the differential pressure sensor is located inside and outside the filter cartridge (3) and interlocked with the pulse controller (27). The pulse controller (27) receives the signal from the differential pressure sensor. When the differential pressure exceeds the preset threshold range, the pulse controller (27) controls the pulse backflushing to remove dust from the outer surface of the filter cartridge (3).

6. The electrostatic powder coating equipment as described in claim 4, characterized in that, The opening face wind speed monitoring device is installed in the powder spraying chamber (1) to monitor the wind speed at the opening face of the baffle plate (23); the powder accumulation thickness monitoring and interlocking device is installed at the bottom of the powder spraying chamber (1) and is connected to the automatic dust removal device (2) by signal; the surface temperature monitoring device is installed at the airlock dust removal device (4) to monitor the dust spontaneous combustion that may be caused by abnormal temperature rise.

7. The electrostatic powder coating equipment as described in claim 1, characterized in that, The explosion-proof and explosion-control device includes an explosion relief system (25) and an explosion-proof lamp (26). The explosion relief system (25) is installed in the dust removal chamber, and the explosion-proof lamp (26) is installed in the powder spraying chamber (1).

8. The electrostatic powder coating equipment as described in claim 1, characterized in that, The electrostatic powder spraying device includes a powder supply tank (7), a powder pump (8), a powder conveying pipe (9), and a powder spraying gun (10). The powder is drawn from the powder supply tank (7) by the powder pump (8) and enters the powder spraying gun (10) through the powder conveying pipe (9). By setting the relevant parameters such as atomization, powder output, voltage, and current, the powder spraying operation is carried out in the powder spraying chamber (1).

9. The electrostatic powder coating equipment as described in claim 1, characterized in that, It also includes a base, on which the powder spraying chamber (1) and the dust removal chamber are fixed, and the bottom of the base is provided with moving wheels and hinge fasteners.

10. The electrostatic powder coating equipment as described in claim 1, characterized in that, The powder spraying chamber (1) and the dust removal chamber are equipped with observation ports, cleaning ports and operation control panels.

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