An automated spray painting apparatus for fire extinguisher shells

Abstract

This invention discloses an automated spraying device for fire extinguisher casings, comprising a spraying box, a spraying unit, a paint and gas supply unit, and a return assembly. The spraying unit is fixedly installed on both sides of the inner wall of the spraying box. The paint nozzle has three nozzle slots and three nozzle slot release ports, allowing it to withstand three times the pressure of a conventional nozzle. This ensures effective mixing of paint particles and high-pressure gas, producing a finer and more uniform atomization effect. The main and auxiliary switching components within the paint nozzle automatically adjust the spray volume and the opening state of the nozzle slots according to the paint mist pressure. When the paint mist pressure exceeds a preset threshold, all three nozzle slots open simultaneously; conversely, when the paint mist pressure falls below the threshold, some nozzle slots automatically close as needed to maintain precise control of the spray volume. This automatic adjustment function helps maintain the stability and uniformity of the spraying, avoiding insufficient or over-spraying under low pressure.

Description

Technical Field

[0001] This invention relates to the field of fire extinguisher shell coating technology, and more particularly to an automated fire extinguisher shell coating equipment. Background Technology

[0002] With the rapid development of industrial automation technology, spraying processes have been widely applied in various fields, especially in manufacturing, where the use of automated spraying equipment is increasing. The application of spraying technology is particularly important in the production of fire extinguishers, ensuring the uniformity and aesthetics of the coating on the extinguisher's outer shell, while also enhancing its corrosion resistance and durability. Therefore, improving the spraying quality and efficiency of fire extinguisher shells, as well as controlling various uncertainties during the spraying process, have become urgent technical problems to be solved.

[0003] Existing spraying equipment typically relies on traditional nozzle designs and spraying systems, which may lead to problems such as uneven spraying, unstable spray volume, and inaccurate spraying distance during operation. These problems are usually closely related to factors such as nozzle spraying pressure, spray volume adjustment, and airflow control. Furthermore, traditional spraying equipment often cannot maintain spraying effectiveness when the air pressure is too low, resulting in incomplete or over-spraying, affecting spraying quality, and failing to effectively prevent paint mist backflow and waste generation during the spraying process.

[0004] To address the aforementioned issues, some innovative spraying equipment designs have been developed in the existing technology. For example, improving nozzle structure to enhance atomization or using automatic adjustment of spray volume and nozzle slot switching to control the spray volume still have limitations. For instance, traditional spraying equipment often uses single-slot nozzles, which cannot effectively handle different spraying pressures, and spray volume adjustment mainly relies on manual operation, lacking an automated adjustment mechanism. At the same time, paint mist recovery and treatment technologies have not been fully resolved, resulting in a high risk of environmental pollution during the spraying process.

[0005] Therefore, how to provide an automated spraying equipment for fire extinguisher casings is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] One objective of this invention is to provide an automated spraying device for fire extinguisher casings. This invention utilizes a paint nozzle with three nozzle slots and three nozzle slot release ports. The paint nozzle can withstand three times the pressure of a conventional nozzle, ensuring effective mixing of paint particles and high-pressure gas, resulting in a finer and more uniform atomization effect. The main and auxiliary switching components within the paint nozzle can automatically adjust the spraying volume and the opening state of the nozzle slots according to the paint mist pressure. When the paint mist pressure exceeds a preset threshold, all three nozzle slots open simultaneously; conversely, when the paint mist pressure falls below the threshold, some nozzle slots automatically close as needed to maintain precise control of the spraying volume. This automatic adjustment function helps maintain the stability and uniformity of the spraying, avoiding insufficient or over-spraying under low pressure.

[0007] This invention ensures consistent coverage and coating effect with each spray by using a paint nozzle with three nozzle slots. Combined with the three-coat design, it ensures no areas are missed, improving coating consistency. Maintaining an effective spray range is a key advantage of this design. When the airflow is too low, automatically closing part of the nozzle slots reduces the amount of paint sprayed, preventing spraying too close or too far and ensuring accurate coating results. Even under low air pressure conditions, the nozzle slots maintain an effective spray range, ensuring uniform coating.

[0008] This invention uses a vacuum hood corresponding to a paint nozzle. When the vacuum pump is activated, it creates negative pressure inside the hood via a vacuum pipe, drawing paint mist into the hood. The paint mist then enters the atomizing separator through an exhaust pipe and an atomizing inlet pipe. The paint mist swirls and flows along the inner wall of the atomizing separator, leaving tiny paint particles on the inner wall. These accumulated particles flow towards the bottom of the atomizing separator, where the paint is filtered by the filter cartridge. The paint seeps into a recovery tank and is then recycled back through a recovery pipe. This method can be used for the initial coating of fire extinguisher shells. Gas inside the atomizing separator passes through a liquid droplet interception mesh, trapping tiny paint particles that flow to the bottom of the atomizing separator.

[0009] An automated spraying device for fire extinguisher casings according to an embodiment of the present invention includes a spraying box, spraying units, paint and gas supply units, and a liquid return assembly. The spraying units are fixedly installed on both sides of the inner wall of the spraying box. Six spraying units are arranged in the same spraying box, with three spraying units per group. The two groups of spraying units are arranged in a staggered and symmetrical manner. The paint and gas supply units are fixedly installed on the paint and gas supply ends of the spraying units. The liquid return assembly is fixedly installed on both sides of the spraying box.

[0010] The spraying unit includes a displacement assembly, a pipe-laying assembly, and paint nozzles. The displacement assembly is fixedly installed on both sides of the inner wall of the spraying box. Six displacement assemblies are arranged in the same spraying box, with three displacement assemblies forming a group. The two groups of displacement assemblies are arranged in a staggered and symmetrical manner. One end of the pipe-laying assembly is fixedly installed on the displacement assembly, and the other end of the pipe-laying assembly is fixedly installed on the bottom of the spraying box. The paint nozzles are threadedly installed on the end of the pipe-laying assembly near the displacement assembly.

[0011] The liquid return assembly includes a suction hood, a suction component, an atomizing separator, a recovery box, and a recovery pipe. The non-open ends of the suction hood are fixedly installed on both sides of the spray box. One end of the suction component is fixedly installed in the middle of the suction hood. The top of the atomizing separator is fixedly installed on the other end of the suction component. The top of the recovery box is fixedly installed on the bottom of the atomizing separator. The recovery pipe is fixedly installed on the bottom of the recovery box.

[0012] The paint nozzle includes an outer shell, a spray core, an air connector, a main switch assembly, and an auxiliary switch assembly. The threaded end of the outer shell is threaded onto the pipe-laying assembly. The spray core is fixedly installed inside the outer shell. The air connector is fixedly installed outside the outer shell. The main switch assembly is fixedly installed inside the spray core. The auxiliary switch assembly is installed inside the spray core. There are three auxiliary switch assemblies, which are arranged at equal angles with the spray core as the center.

[0013] Furthermore, the top of the spray box is provided with a suspension port, and the front and rear ends of the spray box are threaded with sealing plates, and the top of the sealing plates is provided with a discharge chute.

[0014] Furthermore, the displacement assembly includes a vertical frame, a travel crank, a travel groove, and a travel gear assembly. The outer side of the vertical frame is fixedly installed on both sides of the inner wall of the spray box, both ends of the travel crank are fixedly installed on the vertical frame, the travel groove is opened on one side of the travel crank, and the travel gear assembly is fixedly installed on the other side of the travel crank.

[0015] The displacement assembly further includes a displacement frame, a displacement motor, a bevel gear set, a drive shaft, a displacement gear, an auxiliary support wheel, a protective box, and an elastic rubber diaphragm. The displacement frame is slidably mounted on the travel frame. The base of the displacement motor is fixedly mounted on the outer wall of the displacement frame. The input bevel gear of the bevel gear set is fixedly mounted on the rotating shaft of the displacement motor. The output bevel gear of the bevel gear set is fixedly mounted on the drive shaft. Both ends of the drive shaft are rotatably mounted on one side of the displacement frame. The displacement gear is fixedly mounted on the drive shaft and meshes with the travel gear set. The auxiliary support wheel is rotatably sleeved on the wheel frame on the side of the displacement frame away from the displacement gear. The protective box is fixedly mounted on the top of the pipe-laying assembly, and the elastic rubber diaphragm is fixedly mounted on the upper and lower ends of the protective box.

[0016] Furthermore, the pipe-laying assembly includes a main paint pipe, a flexible paint pipe, a liquid electric switch valve, and a nozzle external connector. One end of the main paint pipe extends beyond the spray box, and the other end of the main paint pipe is fixedly installed at the bottom of the spray box. The bottom of the flexible paint pipe is fixedly installed on the main paint pipe, and the liquid electric switch valve is fixedly installed at the bottom of the flexible paint pipe. One end of the nozzle external connector is fixedly inserted into the displacement frame and the protective box, and the other end of the nozzle external connector is fixedly installed at the top of the flexible paint pipe.

[0017] The pipe-laying assembly also includes a main gas pipe, a flexible gas pipe, and a gas electric switch valve. One end of the main gas pipe extends beyond the spray box, and the other end of the main gas pipe is fixedly installed at the bottom of the spray box. The bottom of the flexible gas pipe is fixedly installed on the main gas pipe, the top of the flexible gas pipe is fixedly installed on the gas connection pipe, and the gas electric switch valve is fixedly installed at the bottom of the flexible gas pipe.

[0018] Furthermore, the air extraction assembly includes an air extraction pipe, a mounting platform, an air extraction pump, and an exhaust pipe. One end of the air extraction pipe is fixedly mounted on the air extraction hood, and the other end of the air extraction pipe is fixedly mounted on the air extraction pump. One end of the mounting platform is fixedly mounted on the outer wall of the spray box, the pump base of the air extraction pump is fixedly mounted on the other end of the mounting platform, one end of the exhaust pipe is fixedly mounted on the air extraction pump, and the other end of the exhaust pipe is fixedly mounted on the top of the atomizing separator.

[0019] Furthermore, an atomizing inlet pipe is fixedly installed at the top of the atomizing separator, and the end of the atomizing inlet pipe away from the atomizing separator is fixedly installed on the exhaust pipe. An exhaust pipe is fixedly installed at the top of the atomizing separator, and the bottom of the exhaust pipe extends to the inner bottom of the atomizing separator. A filter element is fixedly installed at the inner bottom of the atomizing separator, and a liquid droplet interception mesh plate is fixedly installed at the inner bottom of the exhaust pipe. The bottom of the atomizing separator is fixedly installed on the top of the recycling bin.

[0020] Furthermore, the nozzle core has a tapered channel inside, a main atomization channel inside, an air supply channel inside, an oblique channel inside, and three atomization auxiliary channels inside, all of which are connected to the main atomization channel. The nozzle core also has a nozzle groove inside.

[0021] Furthermore, the nozzle core has a main switch section inside and an auxiliary switch section inside.

[0022] Furthermore, the main switch assembly includes a main spring and a triangular abutment. One end of the main spring is fixedly installed on the inner wall of the main switch section, and the triangular abutment is fixedly installed on the other end of the main spring. The tip of the triangular abutment is inserted into the atomization main channel.

[0023] Furthermore, the auxiliary switch assembly includes a sealing ring, an auxiliary spring, an incomplete sliding column, a sloping groove, a sloping bottom column, and an adjusting bolt. The sealing ring is located within the auxiliary switch section. One end of the auxiliary spring is fixedly mounted on the sealing ring. One end of the auxiliary spring is fixedly mounted on the incomplete sliding column. The sloping groove is formed on the incomplete sliding column. The incomplete sliding column is slidably mounted within the auxiliary switch section. The sloping end of the sloping bottom column is inserted into the sloping groove. The adjusting bolt is rotatably inserted into the outer shell and the spray core. The threaded end of the adjusting bolt is threaded into the non-sloping end of the sloping bottom column.

[0024] The beneficial effects of this invention are:

[0025] This invention features a paint nozzle with three nozzle slots and three nozzle slot release ports. The paint nozzle can withstand three times the pressure of a conventional nozzle, ensuring effective mixing of paint particles and high-pressure gas, resulting in a finer and more uniform atomization effect. The main and auxiliary switching components within the paint nozzle can automatically adjust the spray volume and the opening status of the nozzle slots according to the paint mist pressure. When the paint mist pressure is greater than a preset threshold, all three nozzle slots will open simultaneously; when the paint mist pressure is lower than the threshold, some nozzle slots will automatically close as needed to maintain precise control of the spray volume. This automatic adjustment function helps maintain the stability and uniformity of the spray, avoiding insufficient or overspraying under low air pressure.

[0026] This invention ensures consistent coverage and coating effect with each spray by using a paint nozzle with three nozzle slots. Combined with the three-coat design, it ensures no areas are missed, improving coating consistency. Maintaining an effective spray range is a key advantage of this design. When the airflow is too low, automatically closing part of the nozzle slots reduces the amount of paint sprayed, preventing spraying too close or too far and ensuring accurate coating results. Even under low air pressure conditions, the nozzle slots maintain an effective spray range, ensuring uniform coating.

[0027] This invention uses a vacuum hood corresponding to a paint nozzle. When the vacuum pump is activated, it creates negative pressure inside the hood via a vacuum pipe, drawing paint mist into the hood. The paint mist then enters the atomizing separator through an exhaust pipe and an atomizing inlet pipe. The paint mist swirls and flows along the inner wall of the atomizing separator, leaving tiny paint particles on the inner wall. These accumulated particles flow towards the bottom of the atomizing separator, where the paint is filtered by the filter cartridge. The paint seeps into a recovery tank and is then recycled back through a recovery pipe. This method can be used for the initial coating of fire extinguisher shells. Gas inside the atomizing separator passes through a liquid droplet interception mesh, trapping tiny paint particles that flow to the bottom of the atomizing separator. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram of the overall structure of an automated spraying equipment for fire extinguisher casings proposed in this invention;

[0030] Figure 2 This is a schematic diagram of the structure of an atomizing separator for an automated spraying equipment for fire extinguisher shells proposed in this invention;

[0031] Figure 3 This is a schematic diagram of the stroke crank frame for an automated spraying equipment for fire extinguisher shells proposed in this invention;

[0032] Figure 4 This invention proposes an automated spraying equipment for fire extinguisher casings. Figure 3 Enlarged view of point A;

[0033] Figure 5 This is a schematic diagram of the structure of an auxiliary support wheel for an automated spraying equipment for fire extinguisher shells proposed in this invention;

[0034] Figure 6 This is a cross-sectional view of a paint nozzle for an automated spraying device for fire extinguisher casings, as proposed in this invention.

[0035] Figure 7 This invention proposes an automated spraying equipment for fire extinguisher casings. Figure 6 Enlarged view of point B.

[0036] In the diagram: 1. Spraying box; 1.1. Suspension port; 1.2. Enclosure plate; 1.3. Discharge chute; 2. Liquid return assembly; 3. Displacement assembly; 3.1. Vertical frame; 3.2. Stroke crank frame; 3.3. Stroke groove; 3.4. Stroke gear set; 3.5. Displacement frame; 3.6. Displacement motor; 3.7. Bevel gear set; 3.8. Drive shaft; 3.9. Displacement gear; 3.10. Auxiliary support wheel; 3.11. Protective box; 3.12. Elastic rubber membrane; 4. Piping assembly; 4.1. Main paint pipe; 4.2. Flexible paint pipe; 4.3. Liquid electric switch valve; 4.4. Nozzle external pipe; 4.5. Main gas pipe; 4.6. Flexible gas pipe; 4.7. Gas electric switch valve; 5. Paint nozzle; 6. Evacuation hood; 7. Evacuation assembly; 7.1. Evacuation pipe; 7.2. Mounting platform; 7.3 7.4. Exhaust pipe; 8. Atomizing separator; 8.1. Atomizing inlet pipe; 8.2. Air outlet pipe; 8.3. Filter cartridge; 8.4. Liquid droplet interception plate; 9. Recovery box; 10. Recovery pipe; 11. Outer shell; 12. Nozzle core; 12.1. Gradient channel; 12.2. Main atomizing channel; 12.3. Air supply channel; 12.4. Angled channel; 12.5. Auxiliary atomizing channel; 12.6. Nozzle slot; 12.7. Main switch section; 12.8. Auxiliary switch section; 13. Air pipe; 14. Main switch assembly; 14.1. Main spring; 14.2. Triangular stop block; 15. Auxiliary switch assembly; 15.1. Sealing ring; 15.2. Auxiliary spring; 15.3. Incomplete sliding column; 15.4. Angled groove; 15.5. Angled bottom column; 15.6. Adjusting bolt. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0038] Please refer to Figures 1 to 7This invention provides an automated spraying device for fire extinguisher shells, comprising a spraying box 1, spraying units, paint and gas supply units, and a return liquid assembly 2. The spraying units are fixedly installed on both sides of the inner wall of the spraying box 1. Six spraying units are arranged within the same spraying box 1, with three units per group. The two groups of spraying units are arranged symmetrically and in a staggered manner. The paint and gas supply units are fixedly installed on the paint and gas supply ends of the spraying units. The return liquid assembly 2 is fixedly installed on both sides of the spraying box 1. A suspension port 1.1 is provided on the top of the spraying box 1. Sealing plates 1.2 are threaded onto the front and rear ends of the spraying box 1. A discharge trough 1.3 is provided on the top of the sealing plates 1.2. The paint and gas supply units employ existing automatic paint supply systems and automatic gas supply systems, which are connected to the spraying units.

[0039] Specifically, the spraying unit includes a displacement component 3, a pipe-laying component 4, and a paint nozzle 5. The displacement component 3 is fixedly installed on both sides of the inner wall of the spraying box 1. There are six displacement components 3 in the same spraying box 1. The six displacement components 3 are arranged in groups of three, and the two groups of displacement components 3 are arranged in a staggered and symmetrical manner. One end of the pipe-laying component 4 is fixedly installed on the displacement component 3, and the other end of the pipe-laying component 4 is fixedly installed on the bottom of the spraying box 1. The paint nozzle 5 is threadedly installed on the end of the pipe-laying component 4 near the displacement component 3. The paint nozzle 5 is used to spray paint.

[0040] More specifically, the displacement assembly 3 includes a vertical frame 3.1, a travel crank 3.2, a travel groove 3.3, and a travel gear set 3.4. The outer sides of the vertical frame 3.1 are fixedly mounted on both sides of the inner wall of the spray box 1. Both ends of the travel crank 3.2 are fixedly mounted on the vertical frame 3.1. The travel groove 3.3 is formed on one side of the travel crank 3.2, and the travel gear set 3.4 is fixedly mounted on the other side of the travel crank 3.2. The displacement assembly 3 also includes a displacement frame 3.5, a displacement motor 3.6, a bevel gear set 3.7, a drive shaft 3.8, a displacement gear 3.9, an auxiliary support wheel 3.10, a protective box 3.11, and an elastic rubber diaphragm 3.12. The displacement frame 3.5 is slidably mounted on the travel crank 3.2. The base of the displacement motor 3.6 is fixedly mounted on the outer wall of the displacement frame 3.5. The bevel gear... The input bevel gear of group 3.7 is fixedly mounted on the rotating shaft of displacement motor 3.6. The output bevel gear of bevel gear group 3.7 is fixedly mounted on transmission shaft 3.8. Both ends of transmission shaft 3.8 are rotatably mounted on one side of displacement frame 3.5. Displacement gear 3.9 is fixedly mounted on transmission shaft 3.8 and meshes with stroke gear group 3.4. Auxiliary support wheel 3.10 is rotatably sleeved on wheel frame on the side of displacement frame 3.5 away from displacement gear 3.9. Protective box 3.11 is fixedly mounted on the top of pipe laying assembly 4. Elastic rubber membrane 3.12 is fixedly mounted on the upper and lower ends of protective box 3.11. Protective box 3.11 and elastic rubber membrane 3.12 protect displacement frame 3.5, displacement motor 3.6, transmission shaft 3.8, displacement gear 3.9 and auxiliary support wheel 3.10 from paint corrosion.

[0041] More specifically, the pipe-laying assembly 4 includes a main paint pipe 4.1, a flexible paint pipe 4.2, a liquid-electric switching valve 4.3, and a nozzle external connection 4.4. One end of the main paint pipe 4.1 extends beyond the spray box 1, and the other end of the main paint pipe 4.1 is fixedly installed at the bottom of the spray box 1. The bottom of the flexible paint pipe 4.2 is fixedly installed on the main paint pipe 4.1. The liquid-electric switching valve 4.3 is fixedly installed at the bottom of the flexible paint pipe 4.2. One end of the nozzle external connection 4.4 is fixedly inserted into the displacement frame 3.5 and the protective box 3.11. The other end of the nozzle external connector 4.4 is fixedly installed on the top of the flexible paint pipe 4.2; the pipe laying assembly 4 also includes a gas main pipe 4.5, a flexible air pipe 4.6 and a gas electric switch valve 4.7, wherein one end of the gas main pipe 4.5 extends out of the spray box 1, the other end of the gas main pipe 4.5 is fixedly installed on the inner bottom of the spray box 1, the bottom of the flexible air pipe 4.6 is fixedly installed on the gas main pipe 4.5, the top of the flexible air pipe 4.6 is fixedly installed on the air connector 13, and the gas electric switch valve 4.7 is fixedly installed on the bottom of the flexible air pipe 4.6.

[0042] More specifically, the paint nozzle 5 includes a housing cylinder 11, a spray core 12, an air connector 13, a main switch assembly 14, and an auxiliary switch assembly 15. The threaded end of the housing cylinder 11 is threaded onto the pipe-laying assembly 4. The spray core 12 is fixedly installed inside the housing cylinder 11. The air connector 13 is fixedly installed outside the housing cylinder 11. The main switch assembly 14 is fixedly installed inside the spray core 12. The auxiliary switch assembly 15 is installed inside the spray core 12. There are three auxiliary switch assemblies 15, which are arranged at equal angles around the spray core 12.

[0043] More specifically, the nozzle 12 has a tapered channel 12.1, a main atomizing channel 12.2, an air supply channel 12.3, and eight oblique channels 12.4 inside. These eight oblique channels 12.4 are arranged in groups of four, with the two groups of channels 12.4 tilted in opposite directions and staggered. The device includes three atomizing auxiliary channels 12.5, all of which are connected to the main atomizing channel 12.2. The nozzle core 12 has a nozzle groove 12.6 inside; a main switch section 12.7 and an auxiliary switch section 12.8 are also located inside the nozzle core 12. The main switch assembly 14 includes a main spring 14.1 and a triangular stop block 14.2, with one end of the main spring 14.1 fixedly installed in the main switch section. On the inner wall of section 12.7, a triangular abutment 14.2 is fixedly installed on the other end of the main spring 14.1, with the tip of the triangular abutment 14.2 inserted into the atomizing main channel 12.2; the auxiliary switch assembly 15 includes a sealing ring 15.1, an auxiliary spring 15.2, an incomplete sliding column 15.3, a beveled groove 15.4, a beveled bottom column 15.5, and an adjusting bolt 15.6, wherein the sealing ring 15.1 is located within the auxiliary switch section 12.8, and one end of the auxiliary spring 15.2 is fixedly installed... Installed on sealing ring 15.1, one end of auxiliary spring 15.2 is fixedly installed on incomplete sliding column 15.3, inclined groove 15.4 is opened on incomplete sliding column 15.3, incomplete sliding column 15.3 is slidably installed in auxiliary switch section 12.8, inclined end of inclined bottom column 15.5 is inserted into inclined groove 15.4, adjusting bolt 15.6 is rotatably inserted into outer shell cylinder 11 and spray core 12, and threaded end of adjusting bolt 15.6 is threaded into non-inclined end of inclined bottom column 15.5.

[0044] Furthermore, the paint and gas supply unit adopts the existing automatic paint supply system and automatic gas supply system, which are connected to the paint main pipe 4.1 and the gas main pipe 4.5. The spraying unit is controlled by the processing system in the production workshop to spray the fire extinguisher shell. This device can disassemble the sealing plate 1.2 and splice multiple spraying boxes 1 together.

[0045] The displacement motor 3.6 is started. The rotation of the displacement motor 3.6 drives the rotation of the bevel gear set 3.7. The rotation of the bevel gear set 3.7 drives the rotation of the transmission shaft 3.8. The rotation of the transmission shaft 3.8 drives the rotation of the displacement gear 3.9. The displacement gear 3.9 meshes with the stroke gear set 3.4. The displacement gear 3.9 moves up and down along the stroke gear set 3.4. The auxiliary support wheel 3.10 stabilizes the displacement frame 3.5 and makes it slide stably on the stroke curved frame 3.2. The displacement frame 3.5 drives the paint nozzle 5 to spray the fire extinguisher shell. The bottom of the stroke curved frame 3.2 has a curved path, and the paint nozzle 5 sprays the bottom of the fire extinguisher shell.

[0046] The automatic paint supply system supplies paint to the main paint pipe 4.1, which then supplies it to the flexible paint pipe 4.2. The liquid electric switch valve 4.3 opens the flow of the flexible paint pipe 4.2, which supplies the paint to the nozzle outer connector 4.4. The paint in the nozzle outer connector 4.4 is then supplied to the paint nozzle 5, which sprays paint onto the fire extinguisher shell.

[0047] The automatic air supply system supplies high-speed air fluid to the gas main pipe 4.5. The high-speed air fluid enters the flexible air pipe 4.6 through the gas main pipe 4.5. The gas electric switch valve 4.7 is opened, and the high-speed air fluid in the flexible air pipe 4.6 is supplied to the air connector 13, and then the air connector 13 supplies it to the paint nozzle 5.

[0048] High-speed flowing paint enters the converging channel 12.1 and the atomizing main channel 12.2. High-speed airflow enters the air supply channel 12.3 and then enters the oblique channel 12.4. The high-speed airflow is then sprayed from the oblique channel 12.4 into the atomizing main channel 12.2. The high-speed flowing paint is displaced and sheared by the high-speed airflow, generating a large amount of paint mist. The paint mist accumulates in the atomizing main channel 12.2, generating significant paint mist pressure. This paint mist pressure pushes the triangular abutment block 14.2, which in turn compresses the main spring 14.1. 4.1 Retraction: The triangular abutment block 14.2 no longer seals the main atomizing channel 12.2, creating a gap between the triangular abutment block 14.2 and the auxiliary atomizing channel 12.5. There are three auxiliary atomizing channels 12.5. Paint mist enters the three auxiliary atomizing channels 12.5, generating pressure that pushes the sealing ring 15.1. The sealing ring 15.1 compresses the auxiliary spring 15.2, and the sealing ring 15.1 no longer seals the auxiliary atomizing channels 12.5. The paint mist then passes through the auxiliary atomizing channels 12.5 and is sprayed out from the three nozzle slots 12.6 onto the surface of the fire extinguisher casing.

[0049] By inserting an Allen wrench into the Allen socket of adjusting bolt 15.6 and turning the wrench, the rotation of adjusting bolt 15.6 causes the inclined base post 15.5 to extend or retract on adjusting bolt 15.6. The inclined surface of the inclined base post 15.5 presses against the inclined groove 15.4 of the incomplete sliding post 15.3, thereby adjusting the position of the incomplete sliding post 15.3 within the auxiliary switch interval 12.8. The auxiliary spring 15.2 is compressed or released, thereby adjusting the threshold for opening the sealing ring 15.1.

[0050] The paint nozzle 5 has three nozzle slots 12.6 and three nozzle slot 12.6 release ports. The paint nozzle 5 can withstand three times the pressure of a conventional nozzle, ensuring effective mixing of paint particles and high-pressure gas, producing a finer and more uniform atomization effect. The better the atomization effect, the smoother the sprayed surface, reducing problems such as paint dripping and running, thereby improving the spraying quality.

[0051] The paint nozzle 5 has three atomizing auxiliary channels 12.5. Each nozzle slot 12.6 sprays onto the fire extinguisher shell along the same trajectory path, and each spray can spray three coats at once. This method can ensure a more uniform coating and avoid the problem of uneven coating caused by the asymmetry of nozzle positions in traditional spraying. Three coats can effectively increase the paint coverage area, improve spraying efficiency and quality, and shorten the length of the production line for spraying the surface of the fire extinguisher shell.

[0052] The main switch assembly 14 and auxiliary switch assembly 15 inside the paint nozzle 5 can automatically adjust the spray volume and the opening state of the nozzle slot 12.6 according to the air pressure and flow rate of the paint particles. When the paint mist pressure is greater than the preset threshold, all three nozzle slots 12.6 will open simultaneously. When the paint mist pressure is lower than the threshold, some nozzle slots 12.6 will be automatically closed as needed, such as closing the auxiliary switch assembly 15 with a large elastic force, to maintain precise control of the spray volume. This automatic adjustment function helps to maintain the stability and uniformity of the spray and avoid insufficient or overspraying when the air pressure is low.

[0053] The spraying path of each nozzle slot 12.6 is the same, ensuring consistent coverage and spraying effect for each spraying; combined with the three-coat design, it can ensure that there are no missed areas on the sprayed surface, improving the consistency of spraying.

[0054] A key advantage of this design is that the paint nozzle 5 maintains an effective range. When the airflow is too low, the amount of paint sprayed is reduced by automatically closing part of the nozzle slot 12.6, which avoids spraying too close or too far and ensures the accuracy of the spraying effect. Even under low air pressure conditions, the nozzle slot 12.6 can still maintain an effective range to ensure uniform spraying.

[0055] Specifically, the liquid return assembly 2 includes a vacuum hood 6, a vacuum assembly 7, an atomizing separator 8, a recovery box 9, and a recovery pipe 10. The non-open ends of the vacuum hood 6 are fixedly installed on both sides of the spray box 1. One end of the vacuum assembly 7 is fixedly installed in the middle of the vacuum hood 6. The top of the atomizing separator 8 is fixedly installed on the other end of the vacuum assembly 7. The top of the recovery box 9 is fixedly installed on the bottom of the atomizing separator 8, and the recovery pipe 10 is fixedly installed on the bottom of the recovery box 9.

[0056] More specifically, the extraction assembly 7 includes an extraction pipe 7.1, a mounting platform 7.2, an extraction pump 7.3, and an exhaust pipe 7.4. One end of the extraction pipe 7.1 is fixedly mounted on the extraction hood 6, and the other end is fixedly mounted on the extraction pump 7.3. One end of the mounting platform 7.2 is fixedly mounted on the outer wall of the spray booth 1, and the pump base of the extraction pump 7.3 is fixedly mounted on the other end of the mounting platform 7.2. One end of the exhaust pipe 7.4 is fixedly mounted on the extraction pump 7.3, and the other end is fixedly mounted on the atomizing distributor. The top of the atomizing separator 8 is fixedly provided with an atomizing inlet pipe 8.1. The end of the atomizing inlet pipe 8.1 away from the atomizing separator 8 is fixedly installed on the exhaust pipe 7.4. The top of the atomizing separator 8 is fixedly provided with an exhaust pipe 8.2. The bottom of the exhaust pipe 8.2 extends to the inner bottom of the atomizing separator 8. A filter cartridge 8.3 is fixedly provided at the inner bottom of the atomizing separator 8. A liquid droplet interception mesh plate 8.4 is fixedly provided at the inner bottom of the exhaust pipe 8. The bottom of the atomizing separator 8 is fixedly installed on the top of the recycling box 9.

[0057] Furthermore, the extraction hood 6 corresponds to a paint nozzle 5. When the extraction pump 7.3 is started, the extraction pump 7.3 creates a negative pressure inside the extraction hood 6 through the extraction pipe 7.1, allowing paint mist to enter the extraction hood 6. The paint mist then enters the atomizing separator 8 through the exhaust pipe 7.4 and the atomizing inlet pipe 8.1. The paint mist swirls and flows around the inner wall of the atomizing separator 8, leaving tiny paint particles on the inner wall of the atomizing separator 8. As the tiny paint particles accumulate, they flow to the bottom of the atomizing separator 8. The paint is filtered at the filter cartridge 8.3 and seeps into the recovery box 9, where it is then recovered through the recovery pipe 10. This paint can be used for the initial spraying of the fire extinguisher's outer shell. The gas inside the atomizing separator 8 passes through the liquid droplet interception mesh plate 8.4, trapping the tiny paint particles, which then flow to the bottom of the atomizing separator 8.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automated spray painting apparatus for fire extinguisher housings, characterized by, It includes a spray box (1), a spraying unit, a paint and gas supply unit and a liquid return assembly (2). The spraying unit is fixedly installed on both sides of the inner wall of the spray box (1). There are six spraying units in the same spray box (1). The six spraying units are arranged in groups of three. The two groups of spraying units are arranged in a staggered and symmetrical manner. The paint and gas supply unit is fixedly installed on the paint and gas supply end of the spraying unit. The liquid return assembly (2) is fixedly installed on both sides of the spray box (1). The spraying unit includes a displacement component (3), a pipe-laying component (4), and a paint nozzle (5). The displacement component (3) is fixedly installed on both sides of the inner wall of the spraying box (1). There are six displacement components (3) in the same spraying box (1). The six displacement components (3) are arranged in groups of three. The two groups of displacement components (3) are arranged in a staggered and symmetrical manner. One end of the pipe-laying component (4) is fixedly installed on the displacement component (3), and the other end of the pipe-laying component (4) is fixedly installed on the bottom of the spraying box (1). The paint nozzle (5) is threadedly installed on the end of the pipe-laying component (4) near the displacement component (3). The liquid return assembly (2) includes a vacuum hood (6), a vacuum assembly (7), an atomizing separator (8), a recovery box (9), and a recovery pipe (10). The non-open end of the vacuum hood (6) is fixedly installed on both sides of the spray box (1). One end of the vacuum assembly (7) is fixedly installed in the middle of the vacuum hood (6). The top of the atomizing separator (8) is fixedly installed on the other end of the vacuum assembly (7). The top of the recovery box (9) is fixedly installed at the bottom of the atomizing separator (8). The recovery pipe (10) is fixedly installed at the bottom of the recovery box (9). The paint nozzle (5) includes an outer shell cylinder (11), a spray core (12), an air pipe (13), a main switch assembly (14), and an auxiliary switch assembly (15). The threaded end of the outer shell cylinder (11) is threaded onto the pipe laying assembly (4). The spray core (12) is fixedly installed inside the outer shell cylinder (11). The air pipe (13) is fixedly installed outside the outer shell cylinder (11). The main switch assembly (14) is fixedly installed inside the spray core (12). The auxiliary switch assembly (15) is installed inside the spray core (12). There are three auxiliary switch assemblies (15), and the three auxiliary switch assemblies (15) are arranged at equal angles with the spray core (12) as the center. The nozzle (12) has a main switch section (12.7) inside, an auxiliary switch section (12.8) inside, and an atomization auxiliary channel (12.5) inside. The main switch assembly (14) includes a main spring (14.1) and a triangular abutment (14.2). One end of the main spring (14.1) is fixedly installed on the inner wall of the main switch section (12.7), and the triangular abutment (14.2) is fixedly installed on the other end of the main spring (14.1). The tip of the triangular abutment (14.2) is inserted into the atomizing main channel (12.2). The auxiliary switch assembly (15) includes a sealing ring (15.1), an auxiliary spring (15.2), an incomplete sliding column (15.3), a beveled groove (15.4), a beveled bottom column (15.5), and an adjusting bolt (15.6). The sealing ring (15.1) is located within the auxiliary switch section (12.8). One end of the auxiliary spring (15.2) is fixedly mounted on the sealing ring (15.1), and the other end of the auxiliary spring (15.2) is fixedly mounted on the incomplete sliding column (15.6). 5.3) The inclined groove (15.4) is opened on the incomplete sliding column (15.3), the incomplete sliding column (15.3) is slidably installed in the auxiliary switch section (12.8), the inclined end of the inclined bottom column (15.5) is inserted into the inclined groove (15.4), the adjusting bolt (15.6) is rotatably inserted into the outer shell cylinder (11) and the spray core (12), and the threaded end of the adjusting bolt (15.6) is threadedly inserted into the non-inclined end of the inclined bottom column (15.5).

2. An apparatus for automated spray painting of fire extinguisher shells as claimed in claim 1 wherein, The top of the spray box (1) is provided with a suspension port (1.1), and the front and rear ends of the spray box (1) are threaded with a sealing plate (1.2). The top of the sealing plate (1.2) is provided with a discharge chute (1.3).

3. An apparatus for automated spray painting of fire extinguisher shells as claimed in claim 1 wherein, The displacement assembly (3) includes a vertical frame (3.1), a travel crank (3.2), a travel groove (3.3), and a travel gear assembly (3.4). The outer side of the vertical frame (3.1) is fixedly installed on both sides of the inner wall of the spray box (1). Both ends of the travel crank (3.2) are fixedly installed on the vertical frame (3.1). The travel groove (3.3) is opened on one side of the travel crank (3.2). The travel gear assembly (3.4) is fixedly installed on the other side of the travel crank (3.2). The displacement assembly (3) further includes a displacement frame (3.5), a displacement motor (3.6), a bevel gear set (3.7), a drive shaft (3.8), a displacement gear (3.9), an auxiliary support wheel (3.10), a protective box (3.11), and an elastic rubber diaphragm (3.12). The displacement frame (3.5) is slidably mounted on the travel crank frame (3.2). The base of the displacement motor (3.6) is fixedly mounted on the outer wall of the displacement frame (3.5). The input bevel gear of the bevel gear set (3.7) is fixedly mounted on the rotating shaft of the displacement motor (3.6). The output bevel gear is fixedly mounted on the drive shaft (3.8). The two ends of the drive shaft (3.8) are rotatably mounted on one side of the displacement frame (3.5). The displacement gear (3.9) is fixedly mounted on the drive shaft (3.8) and meshes with the stroke gear set (3.4). The auxiliary support wheel (3.10) is rotatably sleeved on the wheel frame of the displacement frame (3.5) away from the displacement gear (3.9). The protective box (3.11) is fixedly mounted on the top of the pipe laying assembly (4). The elastic rubber membrane (3.12) is fixedly mounted on the upper and lower ends of the protective box (3.11).

4. The automated spraying equipment for fire extinguisher casings according to claim 1, characterized in that, The pipe-laying assembly (4) includes a main paint pipe (4.1), a flexible paint pipe (4.2), a liquid electric switch valve (4.3), and a nozzle external connector (4.4). One end of the main paint pipe (4.1) extends out of the spray box (1), and the other end of the main paint pipe (4.1) is fixedly installed at the bottom of the spray box (1). The bottom of the flexible paint pipe (4.2) is fixedly installed on the main paint pipe (4.1). The liquid electric switch valve (4.3) is fixedly installed at the bottom of the flexible paint pipe (4.2). One end of the nozzle external connector (4.4) is fixedly inserted into the displacement frame (3.5) and the protective box (3.11), and the other end of the nozzle external connector (4.4) is fixedly installed at the top of the flexible paint pipe (4.2). The pipe-laying assembly (4) also includes a gas main pipe (4.5), a flexible gas pipe (4.6), and a gas electric switch valve (4.7). One end of the gas main pipe (4.5) extends beyond the spray box (1), and the other end of the gas main pipe (4.5) is fixedly installed at the bottom of the spray box (1). The bottom of the flexible gas pipe (4.6) is fixedly installed on the gas main pipe (4.5), and the top of the flexible gas pipe (4.6) is fixedly installed on the gas connection pipe (13). The gas electric switch valve (4.7) is fixedly installed at the bottom of the flexible gas pipe (4.6).

5. The automated spraying equipment for fire extinguisher casings according to claim 1, characterized in that, The air extraction assembly (7) includes an air extraction pipe (7.1), a mounting platform (7.2), an air extraction pump (7.3), and an exhaust pipe (7.4). One end of the air extraction pipe (7.1) is fixedly installed on the air extraction hood (6), and the other end of the air extraction pipe (7.1) is fixedly installed on the air extraction pump (7.3). One end of the mounting platform (7.2) is fixedly installed on the outer wall of the spray box (1). The pump base of the air extraction pump (7.3) is fixedly installed on the other end of the mounting platform (7.2). One end of the exhaust pipe (7.4) is fixedly installed on the air extraction pump (7.3), and the other end of the exhaust pipe (7.4) is fixedly installed on the top of the atomizing separator (8).

6. The automated spraying equipment for fire extinguisher casings according to claim 5, characterized in that, The top of the atomizing separator (8) is fixedly provided with an atomizing inlet pipe (8.1), and the end of the atomizing inlet pipe (8.1) away from the atomizing separator (8) is fixedly installed on the exhaust pipe (7.4). The top of the atomizing separator (8) is fixedly provided with an exhaust pipe (8.2), and the bottom of the exhaust pipe (8.2) extends to the inner bottom of the atomizing separator (8). The inner bottom of the atomizing separator (8) is fixedly provided with a filter cartridge (8.3), and the inner bottom of the exhaust pipe (8.2) is fixedly provided with a liquid droplet intercepting mesh plate (8.4). The bottom of the atomizing separator (8) is fixedly installed on the top of the recycling box (9).

7. An automated spraying device for fire extinguisher casings according to claim 1, characterized in that, The nozzle core (12) has a tapered channel (12.1) inside, a main atomizing channel (12.2) inside, an air supply channel (12.3) inside, an oblique channel (12.4) inside, and three atomizing auxiliary channels (12.5), all of which are connected to the main atomizing channel (12.2). The nozzle core (12) also has a nozzle groove (12.6) inside. There are eight oblique channels (12.4). The eight oblique channels (12.4) are arranged in groups of four. The two groups of oblique channels (12.4) are tilted in opposite directions and are staggered.

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