Resin powder electrostatic spraying safety production system

Abstract

The invention discloses a safety production system for electrostatic spraying of resin powder. The safety production system comprises a powder spraying cabinet (34) arranged in a powder spraying chamber (4), a standby dust removal unit (1) and a fixed dust removal unit (2) which are arranged in a dust remover room, an anechoic chamber (23) and an exhaust outlet (24) which are arranged in a ventilation equipment area, and an automatic control system (5) arranged in a control system area, a flame detector (52) and a powder spraying cabinet fire-fighting pipe electromagnetic valve (53) are arranged at the top of the powder spraying cabinet (34), a powder return unit (14) is arranged at the bottom of the powder spraying cabinet (34), and the powder return unit (14) is sequentially connected with a powder recovery bearing (26), a powder recovery pipe (27) and a powder supply center (44) to form a closed-loop powder supply loop. According to the invention, by constructing a fireproof isolation, bidirectional explosion suppression, closed-loop recovery and intelligent linkage control system, safe, efficient and energy-saving intrinsically safe production of multicolor powder spraying is realized.

Description

Technical Field

[0001] The invention relates to the field of resin powder electrostatics, and in particular to a resin powder electrostatic spraying safety production system. Background Art

[0002] As the country's ecological and environmental protection requirements become increasingly stringent, environmental management departments are tightening controls on organic waste gas emissions, and the use of solvent-based coatings is facing numerous restrictions. Traditional spraying processes using solvent-based coatings, due to the large amount of organic volatiles produced, struggle to meet the latest environmental regulations, placing significant environmental pressure on companies during production.

[0003] Therefore, electrostatic powder coating for resin powder electrostatic spraying has become an important alternative process. This process is widely used in the coating industry for its environmentally friendly and efficient features. However, the currently widely used resin powder electrostatic spraying production systems have significant safety hazards and process flaws, especially in areas such as dust explosion prevention, fire protection, powder recovery, and color switching.

[0004] Most companies use backpack-style powder spraying systems, where the powder spraying cabinet, dust collector, and ventilation equipment are typically stacked and integrated into the same work unit, without independent isolation spaces and lacking effective fire and explosion protection. This structure makes it difficult to systematically recover the dust that flies during the powder spraying process, resulting in large amounts of dust accumulation within the powder spraying cabinet. Once the dust reaches a certain concentration, it is very likely to cause a dust explosion due to static sparks or electrical failures, posing a significant operational safety hazard. Furthermore, the powder spraying cabinet and dust collection system typically lack real-time monitoring and emergency fire extinguishing functions, and lack an effective linkage control system, further exacerbating safety risks.

[0005] When it comes to powder usage, existing technology struggles to efficiently switch between and independently recycle multiple electrostatic powder colors. Using the same dust removal and recovery system for spraying different colors can easily lead to powder color mixing, impacting product quality. Furthermore, the mixed powder cannot be recycled, resulting in wasteful raw materials and increased costs. Deploying separate powder spraying equipment and dust removal systems for each color would require significant equipment investment, significant space requirements, and lengthy process flows, hindering a company's ability to achieve flexible production.

[0006] In summary, the existing resin powder electrostatic spraying system has obvious deficiencies in inherent safety, automatic control, powder recovery, and rapid multi-color switching. There is an urgent need to provide a resin powder electrostatic spraying safety production system with a reasonable structure, safety and reliability, and the ability to achieve rapid multi-color switching and powder recycling to meet the comprehensive needs of modern manufacturing enterprises for environmental protection, safety and efficiency. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a resin powder electrostatic spraying safety production system, which can effectively solve the shortcomings of the existing technology.

[0008] The present invention is achieved through the following technical solutions: a resin powder electrostatic spraying safety production system, comprising: Powder spraying cabinets installed in the powder spraying room, spare dust removal units and fixed dust removal units installed in the dust collector room, muffler rooms and exhaust vents installed in the ventilation equipment area, and automatic control systems installed in the control system area; The top of the powder spraying cabinet is provided with a flame detector and a solenoid valve for the fire protection pipe of the powder spraying cabinet, and the bottom is provided with a powder return unit, which is sequentially connected to the powder recovery holder, the powder recovery pipe and the powder supply center to form a closed-loop powder supply circuit; The powder spraying cabinet is connected to the standby dust removal unit or the fixed dust removal unit through an air inlet pipe, and the air inlet pipe is provided with a two-way explosion-proof device; The powder spraying cabinet cooperates with the powder spraying gun, automatic spraying machine and working conveyor chain arranged in the powder spraying room to perform the spraying operation; A fire wall and a fireproof isolation sealing structure are provided between the powder spraying room and the dust collector, and a Class A fireproof door is provided on the fire wall; The bottoms of the powder spraying cabinet and the dust removal unit are both provided with supporting legs and movable wheels, wherein the fixed dust removal unit is installed on the fixed bracket.

[0009] As an optimal technical solution, the spare dust removal unit and the fixed dust removal unit both include a box body, the interior of the box body is divided into an upper clean area and a lower dirty area by a steel plate, a mounting hole for installing a filter is provided at the lower part, and an inspection door is provided on the box body.

[0010] As a preferred technical solution, a pulse cleaning device is provided above the installation area of ​​the filter to regularly clean dust accumulated on the surface of the filter and improve dust removal efficiency.

[0011] As a preferred technical solution, a flameless explosion relief device is provided on the outside of the box body for releasing explosion pressure when a dust explosion occurs inside the dust removal unit.

[0012] As a preferred technical solution, a muffler chamber and an exhaust port are provided on the top of the dust removal unit. A fan is built into the muffler chamber, and the fan and its circuit are explosion-proof structures.

[0013] As an optimal technical solution, a sprinkler nozzle is provided above the filter, the sprinkler nozzle is connected to the automatic sprinkler fire extinguishing system through the solenoid valve of the dust collector fire pipe, and the sprinkler nozzle is arranged facing the center of the filter.

[0014] As a preferred technical solution, the ash hopper portion of the fixed dust removal unit is provided with a temperature detector and an explosion-proof thermocouple, and the temperature detector is interlocked with the solenoid valve of the dust collector fire pipe to activate the fire extinguishing system in case of fire.

[0015] As a preferred technical solution, the ash hopper is further provided with an air-locking ash unloading device and a pneumatic recovery pump. The automatic control system controls the pneumatic recovery pump to transport the deposited powder through the powder return unit to the powder supply center for reuse.

[0016] As an optimal technical solution, the automatic control system includes a main control cabinet, which is interlocked with the flame detector, the solenoid valve of the powder spray cabinet fire pipe, the solenoid valve of the dust collector fire pipe, the compressed air pressure sensor belt, the compressed air shut-off valve, the powder spray gun, the automatic spray machine, the powder supply center and the fan.

[0017] As a preferred technical solution, the standby dust removal unit and the fixed dust removal unit correspond to electrostatic powder spraying processes of different colors respectively, and the automatic control system controls the switching of different dust removal units.

[0018] The beneficial effects of the present invention are as follows: 1. By arranging a fire wall, a fire door and a fireproof isolation sealing structure between the powder spraying room and the dust collector, an independent fireproof isolation space is constructed, which can effectively block the diffusion path of flames and explosions, reduce the risk of fire spread, and ensure the safety of operators; Second, the present invention arranges flame detectors, temperature sensors, automatic water spray devices and linkage solenoid valves in the powder spray cabinet and dust removal unit. When a fire or abnormal temperature is detected, the system can automatically cut off the gas source and activate the sprinkler fire extinguishing device to quickly extinguish the initial fire source and prevent the situation from escalating. Third, the present invention installs a two-way explosion-proof device on the air inlet duct between the powder spray cabinet and the dust removal unit. This device can block the flame and high-pressure airflow from propagating to the other side when a deflagration occurs on either side, thus building a complete dust explosion isolation system and further improving the safety protection level. Fourth, the present invention is equipped with a powder return unit, a powder recovery holder, and a powder recovery pipe connected to the powder supply center to form a closed loop. Combined with an air-locking dust unloading device and a pneumatic recovery pump, the powder can be automatically unloaded and reused, effectively reducing powder waste and lowering production costs. 5. By configuring a spare dust removal unit and a fixed dust removal unit, and linking them with an automatic control system, the spraying operations of different color powders can be quickly switched, avoiding the problem of powder color mixing and achieving independent spraying and independent recovery of different color powders; 6. The present invention has built an intelligent linkage control architecture with an automatic control system as the core, which can realize centralized monitoring and intelligent linkage of spraying equipment, powder supply unit, dust removal system, air source system, and fire extinguishing system, thereby improving the efficiency, safety and reliability of powder spraying operations; 7. Each functional unit is reasonably arranged according to the powder spraying room, dust collector room, ventilation equipment area, and control system area. The system has a high degree of integration, reduces repeated deployment of equipment, saves factory space, and facilitates equipment maintenance and process optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Description of reference numerals: 1. Spare dust removal unit; 2. Fixed dust removal unit; 3. Fireproof isolation sealing structure; 4. Powder spraying room; 5. Automatic control system; 11. Movable wheel; 12. Support legs; 13. Box; 14. Powder return unit; 15. Air lock and dust removal device; 16. Inspection door; 17. Filter; 18. Flameless explosion venting device; 21. Fixed bracket; 22. Pulse dust cleaning device; 23. Silencer; 24. Exhaust vent; 25. Air inlet duct; 26. Return Powder receiving container; 27. Powder recovery hose; 31. Fire wall; 32. Class A fire door; 34. Powder spraying cabinet; 41. Working conveyor chain; 42. Powder spraying gun; 43. Automatic spraying machine; 44. Powder supply center; 51. Main control cabinet; 52. Flame detector; 53. Powder spraying cabinet fire pipe solenoid valve; 54. Dust collector fire pipe solenoid valve; 55. Compressed air pressure sensor belt; 56. Compressed air shut-off valve; 57. Explosion-proof thermocouple; S. Bidirectional explosion-proof device. DETAILED DESCRIPTION

[0021] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0022] Any feature disclosed in this specification (including any appended claims, abstract, and drawings), unless otherwise stated, may be replaced by other equivalent or similar features. In other words, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0023] like Figure 1 and Figure 2As shown, the present invention's electrostatic resin powder spraying safety production system includes a powder spraying cabinet 34, a dust removal device, a powder supply circuit, a fire detection and automatic fire extinguishing system, a linkage control system, and a spatial structure for zoning. The entire system is arranged within functional areas such as the powder spraying room 4, the dust collector room, the ventilation equipment area, and the control system area, forming a complete powder spraying system that is intrinsically safe, fireproof and explosion-proof, and features powder recovery and multi-color switching.

[0024] A powder spray cabinet 34 is located within the powder spray room 4 and is used for electrostatic powder coating applications. A flame detector 52 and a solenoid valve for the powder spray cabinet 34's fire hose are mounted on top of the cabinet 34. An automatic water sprinkler system is also located inside the cabinet's top. This system detects the flame detector 52 at the initial stage of a fire and automatically triggers a water spray response, effectively extinguishing the fire and quickly managing the situation.

[0025] The powder spray booth 34 is equipped with a lower or side dust suction port at its bottom to maintain negative pressure within the booth, allowing unattached powder to be promptly collected and recovered by the dust removal system while effectively preventing dust from escaping. To ensure efficient dust collection, the dust removal system's exhaust air volume is designed to meet a requirement of Q ≥ 2376A (m³ / h) (where A is the total area of ​​the powder spray booth 4 openings in m²). The air velocity at the booth 34 opening is maintained at ≥ 0.6m / s.

[0026] The powder spray cabinet 34 is connected to the standby dust removal unit 1 or the fixed dust removal unit 2 via an air inlet duct 25. A bidirectional explosion-proof device S is installed on the air inlet duct 25 to block the spread of explosion pressure and flames in the event of an explosion at either end. The powder spray cabinet 34 operates in conjunction with a powder spray gun 42, an automatic sprayer 43, and a working conveyor chain 41 within the powder spray room 4. The system automatically completes workpiece transport, positioning, and spraying operations.

[0027] Firewalls 31 are installed between the powder spray booth 34 and the dust collector, as well as between the other areas. These firewalls are equipped with Class B fire doors and windows, supplemented by fire-resistant isolation and sealing structures 3, effectively separating the work areas. An explosion relief device is also installed between the powder spray booth 4 and the dust collector to quickly release pressure in the event of an explosion, preventing damage to the system structure and protecting workers.

[0028] To prevent explosions caused by electrical sparks, explosion-proof electrical equipment and wiring are installed within 1 meter of the powder spray cabinet 34, the dust collector, and their openings. All wiring is laid in galvanized steel conduit and connected to the electrical equipment via explosion-proof flexible hoses. All threaded connections have a minimum of five turns to ensure the continuity and reliability of the explosion-proof electrical connections. Both the powder spray cabinet 34 and the dust collector are reliably grounded.

[0029] Both the standby dust removal unit 1 and the fixed dust removal unit 2 are located within the dust collector room. Each dust removal unit comprises a metal housing 13, the interior of which is divided into an upper clean zone and a lower dirty zone by a steel plate. The steel plate has multiple circular holes for mounting filter cartridges, which filter dust and connect to the exhaust path. The dirty zone serves as a dust deposition area. An access door 16 is provided on the housing 13 for filter cartridge replacement and dust cleaning maintenance.

[0030] A pulse dust cleaning device 22 is installed above the filter cartridge installation area, which is used to periodically release high-pressure pulse gas to back-blow dust from the filter element surface, thereby improving filtration efficiency and extending the life of the filter element. A flameless explosion relief device 18 is installed on the outside of the box 13. If a dust explosion occurs inside the dust collector, the explosion pressure can be instantly released to avoid structural damage. Explosion-proof ventilation equipment is installed on the top of the dust collector, including a silencer chamber 23, an explosion-proof motor and an exhaust port 24. The ventilation equipment is arranged in the ventilation equipment area, which can efficiently exhaust air and eliminate static electricity accumulation, while ensuring that the equipment operation noise is controlled within a safe range.

[0031] The dust collector is also equipped with an automatic water spray system on top, consisting of an open sprinkler nozzle, a water pipe, and a normally closed solenoid valve. The nozzle is positioned directly opposite the center of the filter cartridge. A temperature monitor and explosion-proof thermocouple 57 are installed in the dust contamination area of ​​the dust collector housing 13. When the monitored temperature reaches 70°C, the temperature sensor interlocks with the normally closed solenoid valve to automatically open, triggering the water spray system to spray and cool the area and extinguish the fire.

[0032] Each dust collector's hopper is equipped with an air lock and dust discharge device 15 (a double-layer pneumatic gate valve), an electrostatic powder recovery bucket, and a pneumatic recovery pump. A PLC controller with built-in dust discharge program logic controls the air lock valve and recovery pump according to a set time cycle, automatically discharging powder deposited in the hopper and transporting it through the powder return unit 14 to the powder supply center 44 for reuse, achieving powder recycling and effectively reducing material waste.

[0033] A mobile cartridge dust collector is installed beneath the ventilation system, allowing the appropriate dust collection unit to be switched based on actual production tasks, achieving a "one color, one dust collector" solution. Multiple electrostatic powder coating colors can share the same powder spray cabinet 34, air ducting, ventilation equipment, and control devices, preventing cross-contamination between powders and improving color switching speed and cleanliness.

[0034] The automatic control system 5 is located in the control system area. Its core is the main control cabinet 51, which integrates a PLC and interlocking module. This system implements full-process electrical interlocking control with the flame detector 52, the solenoid valve for the fire hose in the powder spray cabinet 34, the solenoid valve for the fire hose in the dust collector 54, the compressed air pressure sensor 55, the compressed air shut-off valve 56, the powder spray gun 42, the automatic sprayer 43, the powder supply center 44, and the fan. If an anomaly occurs in any link, such as an over-temperature, flame signal, or dust concentration alarm, the control system immediately interrupts the powder spraying operation, cuts off the air supply, and initiates emergency fire-fighting procedures to ensure production safety.

[0035] The spare dust removal unit 1 and the fixed dust removal unit 2 in the system can be adapted to different colors of powder spraying processes respectively. The automatic control system 5 can quickly control the start and stop switching of the dust collector, realize the rapid switching of multi-color powder spraying, independent recovery and reuse of powder, reduce color pollution and waste, and reduce production costs.

[0036] This implementation not only achieves orderly control, recycling and efficient dust removal of dust during the resin powder spraying operation, but also improves the system's safety protection level to the intrinsic safety standard. It is particularly suitable for electrostatic powder spraying factory scenarios where there is a risk of dust explosion, multi-color switching is required, and environmentally friendly recycling is emphasized. It has extremely high practical value and promotion significance.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined in the claims.

Claims

1. A resin powder electrostatic spraying safety production system, characterized in that: include: a powder spray cabinet (34) disposed in the powder spray room (4), a standby dust removal unit (1) and a fixed dust removal unit (2) disposed in the dust collector room, a muffler room (23) and an exhaust port (24) disposed in the ventilation equipment area, and an automatic control system (5) disposed in the control system area; The powder spraying cabinet (34) is provided with a flame detector (52) and a powder spraying cabinet fire protection pipe electromagnetic valve (53) on the top, and a powder return unit (14) is provided on the bottom. The powder return unit (14) is connected to the powder recovery holder (26), the powder recovery pipe (27) and the powder supply center (44) in sequence to form a closed-loop powder supply circuit; The powder spraying cabinet (34) is connected to the standby dust removal unit (1) or the fixed dust removal unit (2) via an air inlet pipe (25), and a two-way explosion-proof device (S) is provided on the air inlet pipe (25); The powder spraying cabinet (34) cooperates with a powder spraying gun (42), an automatic spraying machine (43) and a working conveyor chain (41) arranged in the powder spraying room to perform a spraying operation; A fire wall (31) and a fireproof isolation sealing structure (3) are provided between the powder spraying room and the dust collector, and a Class A fireproof door (32) is provided on the fire wall (31); The bottoms of the powder spraying cabinet (34) and the dust removal units (1, 2) are both provided with supporting legs (12) and movable wheels (11), wherein the fixed dust removal unit (2) is mounted on a fixed bracket (21).

2. The resin powder electrostatic spraying safety production system according to claim 1 is characterized in that: The standby dust removal unit (1) and the fixed dust removal unit (2) both comprise a box body (13), the interior of the box body (13) being divided into an upper clean area and a lower dirty area by a steel plate, a mounting hole for mounting a filter (17) being provided at the lower portion, and an inspection door (16) being provided on the box body (13).

3. The resin powder electrostatic spraying safety production system according to claim 1, characterized in that: A pulse dust cleaning device (22) is provided above the installation area of ​​the filter (17) for regularly cleaning dust accumulated on the surface of the filter to improve dust removal efficiency.

4. The resin powder electrostatic spraying safety production system according to claim 1, characterized in that: A flameless explosion relief device (18) is provided outside the box (13) for releasing explosion pressure when a dust explosion occurs inside the dust removal unit.

5. The resin powder electrostatic spraying safety production system according to claim 1, characterized in that: A muffler chamber (23) and an air outlet (24) are provided on the top of the dust removal unit. A fan is built into the muffler chamber (23). The fan and its circuit are explosion-proof structures.

6. The resin powder electrostatic spraying safety production system according to claim 2, characterized in that: A sprinkler nozzle is provided above the filter (17), and the sprinkler nozzle is connected to the automatic sprinkler fire extinguishing system through the dust collector fire pipe solenoid valve (54), and the sprinkler nozzle is arranged facing the center of the filter (17).

7. The resin powder electrostatic spraying safety production system according to claim 1, characterized in that: The ash hopper portion of the fixed dust removal unit (2) is provided with a temperature detector (56) and an explosion-proof thermocouple (57); the temperature detector (56) is interlocked with the dust collector fire pipe solenoid valve (54) for activating a fire extinguishing system in the event of a fire.

8. The resin powder electrostatic spraying safety production system according to claim 6, characterized in that: The ash hopper is also provided with an air-locking ash-discharging device (15) and a pneumatic recovery pump. The automatic control system (5) controls the pneumatic recovery pump to transport the deposited powder to the powder supply center (44) through the powder return unit (14) for reuse.

9. The resin powder electrostatic spraying safety production system according to claim 1, characterized in that: The automatic control system (5) includes a main control cabinet (51), which is interlocked with a flame detector (52), a solenoid valve for a fire-fighting pipe of a powder spraying cabinet (53), a solenoid valve for a fire-fighting pipe of a dust collector (54), a compressed air pressure sensor belt (55), a compressed air shut-off valve (56), a powder spraying gun (42), an automatic spraying machine (43), a powder supply center (44) and a fan for control.

10. The resin powder electrostatic spraying safety production system according to claim 1, characterized in that: The standby dust removal unit (1) and the fixed dust removal unit (2) respectively correspond to electrostatic powder spraying processes of different colors, and the automatic control system (5) controls the switching of different dust removal units.

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