An explosion-proof dust removal and recovery device for powder spraying equipment

Abstract

The invention discloses an explosion-proof dust removal and recovery device for powder spraying equipment, which belongs to a dust removal system device. The device comprises a filter element recovery device and a powder spraying room respectively connected to two sides of a cyclone recovery device, air ducts are connected between the cyclone recovery device, the filter element recovery device and the powder spraying room, two layers of filter space are arranged in the filter element recovery device, the two layers of filter space respectively spray water to reduce dust or dry airflow with ultraviolet light, so as to facilitate dust recovery and airflow purification, a water spray fire extinguishing system is connected between the powder spraying room and the filter element recovery device, the powder spraying room is extinguished by the water spray fire extinguishing system and the filter element recovery device is sprayed with water to reduce dust, the lower ends of the cyclone recovery device and the filter element recovery device are both connected with a pulse powder return mechanism, dust removal and recovery of air in the powder spraying room can be realized by the cyclone recovery device and the filter element recovery device, and the dust recovery rate can be improved by spraying water to reduce dust in the filter element recovery device by the water spray fire extinguishing system.

Description

Technical Field

[0001] The invention relates to a dust removal system device, and more particularly to an explosion-proof dust removal and recovery device for powder spraying equipment. Background Art

[0002] Electrostatic powder spraying is a common process in modern industry. Electrostatic powder spraying is based on the principle of electrostatic attraction, that is, the grounded object to be coated is used as the positive electrode, the oil atomizer (i.e., spray cup or spray plate) is connected to high voltage as the negative electrode, and the strip to be oiled passes through the upper and lower spray beams. The spray beams are made of special aluminum alloy and fixed on adjustable insulating arms. The gap on the spray beam can be evenly adjusted to 0.2mm. An oil groove is opened inside it, the oil inlet pipe is connected to the middle, and two return pipes are connected to the two ends. The upper and lower spray beams are separated from the strip by a certain distance. The spray beam is designed so that the oil flows to the spray port under zero pressure. When the spray beam is energized, a high-voltage electrostatic field is generated between the spray beam and the grounded strip, and corona discharge is generated at the negative electrode, making the sprayed oil mist negatively charged. Under the action of the electrostatic field, the charged particles are efficiently and evenly adsorbed to the passing strip along the direction of the power line, presenting a unique "embracing effect". Electrostatic spraying can also use positive corona discharge, but the critical voltage (starting voltage) of negative corona discharge is lower than that of positive corona discharge, which is more stable, safe and less likely to produce sparks.

[0003] When powder spraying equipment is used, a large amount of powder particles in the powder airflow may be released into the air, so these dusts need to be recovered and reused to improve the utilization rate of raw materials. The existing recovery device has low recovery efficiency and does not constitute a complete recycling system, which cannot meet the development needs of modern industry.

[0004] Although cyclone dust collectors or filter element dust removal devices are currently used to recover dust in production, the current cyclone dust collectors can only collect dust with larger particles, and the dust recovery rate is low. Some tiny dust may still be discharged from the cyclone dust collector with the airflow. Although the current filter element dust removal device can block most of the dust, the dust is easy to adhere to the filter element, which is inconvenient for dust recovery. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide an explosion-proof dust removal and recovery device for powder spraying equipment, which can realize dust removal and recovery of the air in the powder spraying room through a cyclone recovery device and a filter element recovery device, and spray water to reduce dust in the filter element recovery device and extinguish the fire in the powder spraying room through a water sprinkler fire extinguishing system, thereby improving the dust recovery rate through two recovery devices and water spraying and dust reduction in the device.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] An explosion-proof dust recovery device for powder spraying equipment comprises a cyclone recovery device, wherein a filter element recovery device and a powder spraying room are connected to two sides of the cyclone recovery device, respectively, and an air duct is connected between the cyclone recovery device, the filter element recovery device and the powder spraying room, and the filter element recovery device comprises a shell, a sealing door is connected to a hinge on the shell, the lower end of the shell is connected to an air outlet pipe, the bottom end of the shell is fixedly connected to a ash collecting hopper, a plurality of mounting plates are connected to the lower end of the inner wall of the shell, an interlayer plate is provided on the upper side of the mounting plate, the interlayer plate is fixedly connected to the inner wall of the shell, a plurality of first filter elements are clamped between the shells and the interlayer plates, a plurality of second filter elements are provided on the upper side of the interlayer plate, one end of the second filter element is clamped with the inner wall of the shell, a threaded sealing hole matching the second filter element is drilled on the shell, the other end of the second filter element is connected to the air outlet pipe, the inner core of the second filter element is communicated with the air outlet pipe, and an ultraviolet drying lamp is connected to the top of the inner wall of the shell.

[0010] Furthermore, the filter element recovery device is connected to a water sprinkler fire extinguishing system, and the water sprinkler fire extinguishing system includes a water supply pipe, one end of the water supply pipe is connected to the external water supply pipe, and the other end of the water supply pipe is connected to a filter element spray pipe and a powder spray room spray pipe, the filter element spray pipe is connected to the interlayer plate, and one end of the filter element spray pipe located in the filter element recovery device is connected to a plurality of evenly distributed atomizing nozzles.

[0011] Furthermore, the material of the cyclone recovery device is Q235, the wall thickness of the cyclone recovery device is 2-2.5 mm, and the outer diameter of the cyclone recovery device is 1-1.3 m.

[0012] Furthermore, the material of the filter element recovery device is Q235, and the plate thickness of the filter element recovery device is 2.5-3mm.

[0013] Furthermore, the powder spraying room is made of PP material, and is connected with dual infrared flame detectors and a spray nozzle, and the spray nozzle is connected to a spray pipe of the powder spraying room, so as to facilitate fire extinguishing in the powder spraying room.

[0014] Furthermore, a one-way explosion-proof valve is provided between the cyclone recovery device and the filter element recovery device. The one-way explosion-proof valve is fixedly connected to the air duct, and the one-way explosion-proof valve is used to prevent the air duct from rupturing.

[0015] Furthermore, the lower ends of the cyclone recovery device and the filter element recovery device are connected to a pulse-type powder return mechanism, and the pulse-type powder return mechanism includes a first clamping valve, the lower end of the first clamping valve is connected to a high-pressure air pump, and the lower end of the high-pressure air pump is connected to a second clamping valve, which facilitates the regular discharge of powder from the cyclone recovery device and the filter element recovery device.

[0016] Furthermore, the first filter element and the second filter element are both set to 6 groups, the first filter element and the second filter element both adopt 3566FR double-layer flame-retardant filter element, the inclination of the ash hopper is 65°, and the lower end of the ash hopper is connected to an air-locking ash discharge valve.

[0017] Furthermore, the cyclone recovery device, the filter element recovery device, the water sprinkler fire extinguishing system and the powder spraying room are all connected to a control system, and the control system adopts a PLC control system with a touch screen.

[0018] Furthermore, two pairs of grounding piles are connected to the lower end of the ash hopper, and a dielectric plate is connected between the grounding piles and the ash hopper. The materials of the grounding piles and the dielectric plate are galvanized flat steel, which is convenient for introducing static electricity in the device into the ground.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] (1) This scheme uses a cyclone recovery device and a filter element recovery device to remove dust from the air in the powder spraying room. The filter element recovery device uses double-layer filtration. Both filter spaces use filter elements for physical filtration. Multiple atomizing nozzles are provided in the lower filter space to facilitate the agglomeration and falling of fine dust in the airflow. In addition, an ultraviolet drying lamp is provided in the upper filter space to facilitate the drying of the airflow.

[0022] (2) In this scheme, the powder spraying room is connected with a double infrared flame detector connected to a water sprinkler fire extinguishing system, so that fire can be extinguished in time when it occurs in the powder spraying room. The atomizing nozzle in the filter element recovery device is connected to the water sprinkler fire extinguishing system. The water sprinkler fire extinguishing system can supply water to the filter element recovery device and also to the fire extinguishing sprinkler in the powder spraying room. One system supplies water to two rotating shafts, which is easy to save installation space.

[0023] (3) The lower ends of the cyclone recovery device and the filter element recovery device are both connected to a pulse powder return mechanism, which includes a first pinch valve, the lower end of the first pinch valve is connected to a high-pressure air pump, and the lower end of the high-pressure air pump is connected to a second pinch valve. The above structure can realize pulse powder discharge, facilitate the automatic control of powder unloading of the device, and reduce manual operation.

[0024] (4) Two pairs of grounding piles are connected to the lower end of the ash hopper, and a dielectric plate is connected between the grounding piles and the ash hopper. The grounding piles and the dielectric plate are made of galvanized flat steel, which can conduct the static electricity on the device to the ground, making the device less likely to be damaged by static electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front perspective view of the cyclone recovery device and the filter element recovery device of the present invention;

[0026] Figure 2 It is a back perspective view of the cyclone recovery device and the filter element recovery device of the present invention;

[0027] Figure 3 for Figure 1 Cross-sectional view when installing the pulse powder return mechanism;

[0028] Figure 4 An exploded view of the filter element recovery device of the present invention;

[0029] Figure 5 A three-dimensional diagram of the filter element recovery device of the present invention when the sealing door is removed;

[0030] Figure 6 It is the principle diagram of the water sprinkler fire extinguishing system of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the present invention;

[0032] Figure 8 It is a circuit schematic diagram of the present invention.

[0033] 1 cyclone recovery device, 2 filter element recovery device, 201 shell, 202 mounting plate, 203 interlayer plate, 204 first filter element, 205 second filter element, 206 ultraviolet drying lamp, 207 ash hopper, 3 water sprinkler fire extinguishing system, 301 water supply pipeline, 302 filter element spray pipeline, 303 powder spray room spray pipeline, 304 atomizing nozzle, 4 powder spray room, double infrared flame detector, spray nozzle, 5 air outlet pipe, 6 first pinch valve, 7 high-pressure air pump, 8 second pinch valve, 9 air duct, 10 one-way explosion-proof valve, 11 grounding pile, 12 medium plate. DETAILED DESCRIPTION

[0034] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Embodiment 1:

[0038] See also Figure 1 , Figure 2 and Figure 3 , an explosion-proof dust collection and recovery device for powder spraying equipment, comprising a cyclone collection device 1, the cyclone collection device 1 is a prior art, the material of the cyclone collection device 1 is Q235, the wall thickness of the cyclone collection device 1 is 2-2.5mm, the outer diameter of the cyclone collection device 1 is 1-1.3m, the two sides of the cyclone collection device 1 are respectively connected with a filter element collection device 2 and a powder spraying room 4, the size of the powder spraying room 4 is 6*1.4*2.3m, the powder spraying room 4 is connected with a conveyor chain, the length of the conveyor chain is 110-114m, the powder spraying room 4 is connected with a drying tunnel, the net size of the drying tunnel is 86*1.5*2.8m, the powder spraying room 4 is made of PP material, and is connected with double infrared flame detectors and spray nozzles in the powder spraying room 4, and air ducts 9 are connected between the cyclone recovery device 1, the filter element recovery device 2 and the powder spraying room 4, and a fire damper is connected to the air duct 9 between the powder spraying room 4 and the cyclone recovery device 1, and the dust in the powder spraying room 4 is introduced into the cyclone recovery device 1 through the air duct 9, and a one-way explosion-proof valve 10 is arranged between the cyclone recovery device 1 and the filter element recovery device 2, and the one-way explosion-proof valve 10 is fixedly connected to the air duct 9 between the cyclone recovery device 1 and the filter element recovery device 2.

[0039] The filter element recovery device 2 includes a housing 201, a sealing door is connected to the housing 201 on a hinge, the housing 201 is made of Q235, the thickness of the housing 201 is 2.5-3mm, the lower end of the housing 201 is connected to an air outlet pipe 5, the air outlet pipe 5 is connected to a fan, the fan is an explosion-proof fan, the blades of the fan are made of non-conductive materials, the bottom end of the housing 201 is fixedly connected to an ash hopper 207, and the inclination of the ash hopper 207 is 65° The lower end of the ash hopper 207 is connected to an air lock ash discharge valve, and the lower end of the inner wall of the shell 201 is connected to multiple mounting plates 202. The upper side of the mounting plate 202 is provided with a partition plate 203. Through the action of the partition plate 203, after the shell 201 is sealed by the sealing door, two filtering spaces are formed in the shell 201. The partition plate 203 is fixedly connected to the inner wall of the shell 201. A first filter element 204 is clamped between the multiple shells 201 and the partition plate 203. The filter spaces are connected through the first filter element 204, and the interlayer plate 203 is provided with a plurality of vents matching the inner diameter of the first filter element 204. The upper side of the interlayer plate 203 is provided with a plurality of second filter elements 205, one end of the second filter element 205 is clamped with the inner wall of the shell 201, and the shell 201 is provided with a threaded sealing hole matching the second filter element 205, the second filter element 205 is threadedly connected with the threaded sealing, and the other end of the second filter element 205 is connected with the air outlet pipe 5, and the inner wall of the shell 201 is provided with a through hole matching the second filter element 205 and communicating with the air outlet pipe 5, and the upper filter space in the shell 201 is communicated with the air outlet pipe 5 through the second filter element 205, the first filter element 204 and the second filter element 205 are both arranged in 6 groups, and the first filter element 204 and the second filter element 205 both adopt 3566FR double-layer flame-retardant filter element, and the top of the inner wall of the shell 201 is connected with an ultraviolet drying lamp 206,

[0040] The filter element recovery device is divided into an upper and lower double-layer filtering space through an interlayer plate 203. Filter elements are used for physical filtration in both filtering spaces. A plurality of atomizing nozzles 304 are arranged in the lower filtering space. The atomizing nozzles 304 spray water mist, which reduces the dust in the airflow, causing the dust in the air to agglomerate and fall to the bottom of the dust collecting hopper 207, making it easy for the fine dust in the airflow to agglomerate and fall. After the dust agglomerates, it is not easy to adhere to the two filter elements, which facilitates the recovery of dust in the airflow. An ultraviolet drying lamp 206 is arranged in the upper filtering space, and the airflow is dried and disinfected by the ultraviolet drying lamp 206, so that the discharged airflow can be clean and hygienic.

[0041] The filter element recovery device 2 is connected to a water sprinkler fire extinguishing system 3, which includes a water supply pipe 301. The water supply pipe 301 is connected to a water pressure detector. When the water pressure is lower than 2.0 kg, the water pressure detector sends a signal to the PLC control system, and the system alarms. At the same time, the PLC system controls the fan, powder spraying system and other devices to shut down and cut off the power. One end of the water supply pipe 301 is connected to the external water supply pipe, and the other end of the water supply pipe 301 is connected to the filter element spray pipe 302 and the powder spraying room spray pipe 303. The shower pipe 302 is connected to the interlayer plate 203. One end of the filter element spray pipe 302 located in the filter element recovery device 2 is connected to a plurality of evenly distributed atomizing nozzles 304. The spray nozzles are connected to the spray pipe 303 of the powder spraying room. When the flame detector in the powder spraying room detects a flame signal, it sends a signal to the PLC control system. The PLC control system opens the solenoid valve on the spray pipe 303 of the powder spraying room, and the spray nozzles spray water. The PLC system also gives out sound and light alarms, and controls the fan, powder spraying system and other devices to shut down and cut off the power.

[0042] The powder spraying room 4 is connected with a double infrared flame detector connected to the water sprinkler fire extinguishing system 3, so that when a fire occurs in the powder spraying room 4, the fire can be extinguished in time. The atomizing nozzle 304 in the filter element recovery device 2 is connected to the water sprinkler fire extinguishing system 3. The water sprinkler fire extinguishing system 3 can supply water to the atomizing nozzle 304 in the filter element recovery device 2 and also to the sprinkler nozzle in the powder spraying room 4. One system supplies water to two devices, which is easy to save installation space.

[0043] The lower ends of the cyclone recovery device 1 and the filter element recovery device 2 are both connected to a pulse powder return mechanism, which includes a first pinch valve 6, the lower end of the first pinch valve 6 is connected to a high-pressure air pump 7, and the lower end of the high-pressure air pump 7 is connected to a second pinch valve 8. The working principle of the pulse powder return mechanism is: the first pinch valve 6 is opened, the high-pressure air pump 7 and the second pinch valve 8 are closed, so that the dust in the ash hopper 207 falls, and then the first pinch valve 6, the high-pressure air pump 7 and the second pinch valve 8 are closed, so that the dust is located between the two pinch valves, and then the first pinch valve 6 is closed, the high-pressure air pump 7 and the second pinch valve 8 are opened for powder feeding, and finally the first pinch valve 6, the high-pressure air pump 7 and the second pinch valve 8 are closed, and then the above steps are repeated to discharge the dust in the ash hopper 207, and the discharged dust is recovered through containers such as recovery boxes. This pulse powder feeding can realize intermittent dust discharge of the ash hopper 207, facilitate automatic control, and prevent the dust in the ash hopper 207 from accumulating too much.

[0044] Two pairs of grounding piles 11 are connected to the lower end of the ash collecting hopper 207, and a dielectric plate 12 is connected between the grounding piles 11 and the ash collecting hopper 207. The materials of the grounding piles 11 and the dielectric plate 12 are both galvanized flat steel, and the lowest point of the grounding piles 11 is buried in the mud ground. Through the conductive effect of the dielectric plate 12 and the grounding piles 11, the static electricity in the filter element recovery device 2 is guided to the ground.

[0045] The cyclone recovery device 1, the filter recovery device 2, the water sprinkler fire extinguishing system 3 and the powder spraying room 4 are all connected to the control system. The control system adopts a PLC control system with a touch screen. The alarm information of all equipment is fed back on the touch screen. The PLC control system is electrically connected to the external power supply.

[0046] During use, the user controls the PLC system to perform the powder spraying work in the powder spraying room 4. During operation, the free dust in the powder spraying room 4 enters the cyclone recovery device 1 through the air outlet pipe 5 for cyclone dust removal, and then the airflow passes through the air duct 9 to the filter element recovery device 2. The airflow enters the device from the lower end of the filter element recovery device 2, and then the airflow passes through two layers of filtering space in turn. The dust in the airflow is filtered by the first filter element 204 and the second filter element 205. The user can also use the PLC control system to open the solenoid valve on the core spray pipe 302 to make the atomizing nozzle 304 spray water mist, which is finally dried and disinfected by the ultraviolet drying lamp 206 and finally discharged from the filter element recovery device 2.

[0047] The above is only a preferred specific implementation manner of the present invention; but the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered by the protection scope of the present invention.

Claims

1. An explosion-proof dust collection and recovery device for a powder spraying device, comprising a cyclone collection device (1), characterized in that: The filter element recovery device (2) and the powder spraying room (4) are respectively connected to the two sides of the cyclone recovery device (1); an air duct (9) is connected between the cyclone recovery device (1), the filter element recovery device (2) and the powder spraying room (4); the filter element recovery device (2) comprises a shell (201); a sealing door is hingedly connected to the upper part of the shell (201); an air outlet duct (5) is connected to the lower end of the shell (201); an ash collecting hopper (207) is fixedly connected to the bottom end of the shell (201); A plurality of mounting plates (202) are connected to the lower end of the inner wall, a partition plate (203) is provided on the upper side of the mounting plate (202), the partition plate (203) is fixedly connected to the inner wall of the shell (201), a first filter element (204) is clamped between the plurality of shells (201) and the partition plate (203), a plurality of second filter elements (205) are provided on the upper side of the partition plate (203), one end of the second filter element (205) is clamped to the inner wall of the shell (201), and a second filter element (205) is cut on the shell (201) to be connected to the inner wall of the shell (201). The filter element (205) has a threaded sealing hole matching the filter element (205), the other end of the second filter element (205) is connected to the air outlet pipe (5), the inner core of the second filter element (205) is in communication with the air outlet pipe (5), and the top of the inner wall of the shell (201) is connected to an ultraviolet drying lamp (206); the filter element recovery device (2) is connected to a water sprinkler fire extinguishing system (3), the water sprinkler fire extinguishing system (3) comprises a water supply pipe (301), one end of the water supply pipe (301) is connected to an external water supply pipe, and the water supply pipe The other end of (301) is connected to a filter element spray pipe (302) and a powder spray room spray pipe (303); the filter element spray pipe (302) is connected to the interlayer plate (203); one end of the filter element spray pipe (302) located in the filter element recovery device (2) is connected to a plurality of evenly distributed atomizing nozzles (304); the powder spray room (4) is made of PP material; a double infrared flame detector and a spray nozzle are connected to the powder spray room spray pipe (303); the spray nozzle is connected to the powder spray room spray pipe (303).

2. The explosion-proof dust removal and recovery device for powder spraying equipment according to claim 1, characterized in that: The material of the cyclone recovery device (1) is Q235, the wall thickness of the cyclone recovery device (1) is 2-2.5 mm, and the outer diameter of the cyclone recovery device (1) is 1-1.3 m.

3. The explosion-proof dust removal and recovery device for powder spraying equipment according to claim 1, characterized in that: The material of the filter element recovery device (2) is Q235, and the plate thickness of the filter element recovery device (2) is 2.5-3 mm.

4. The explosion-proof dust removal and recovery device for powder spraying equipment according to claim 1, characterized in that: A one-way explosion-proof valve (10) is provided between the cyclone recovery device (1) and the filter element recovery device (2), and the one-way explosion-proof valve (10) is fixedly connected to the air duct (9).

5. The explosion-proof dust removal and recovery device for powder spraying equipment according to claim 1, characterized in that: The lower ends of the cyclone recovery device (1) and the filter element recovery device (2) are both connected to a pulse powder return mechanism, the pulse powder return mechanism comprising a first pinch valve (6), the lower end of the first pinch valve (6) is connected to a high-pressure air pump (7), and the lower end of the high-pressure air pump (7) is connected to a second pinch valve (8).

6. The explosion-proof dust removal and recovery device for powder spraying equipment according to claim 1, characterized in that: The first filter element (204) and the second filter element (205) are both arranged in 6 groups, the first filter element (204) and the second filter element (205) both adopt 3566FR double-layer flame-retardant filter elements, the inclination of the ash collecting hopper (207) is 65°, and the lower end of the ash collecting hopper (207) is connected to an air-locking ash discharge valve.

7. The explosion-proof dust removal and recovery device for powder spraying equipment according to claim 1, characterized in that: The cyclone recovery device (1), the filter element recovery device (2), the water sprinkler fire extinguishing system (3) and the powder spraying room (4) are all connected to a control system, and the control system adopts a PLC control system with a touch screen.

8. The explosion-proof dust removal and recovery device for powder spraying equipment according to claim 1, characterized in that: Two pairs of grounding piles (11) are connected to the lower end of the ash collecting hopper (207), and a dielectric plate (12) is connected between the grounding piles (11) and the ash collecting hopper (207). The grounding piles (11) and the dielectric plate (12) are both made of galvanized flat steel.

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