Airplane hub paint spraying system

Abstract

The utility model discloses an aircraft hub paint spraying system which comprises a preparation area provided with an elevator capable of controlling a hub to ascend and descend; the spraying and drying integrated room is provided with a spraying area and a drying area and can conduct spraying and drying treatment on the hub; the circulating chain comprises a circulating track, a walking mechanism and a first lifting appliance, the circulating track penetrates through the preparation area, the spraying area and the drying area and is connected end to end, and the first lifting appliance is used for lifting and circularly conveying the hub; the support is used for installing the circulating track and enabling the circulating track to be switched between a high position and a low position in the spraying area; and the control system can control the walking speed and start-stop rhythm of the walking mechanism. When the aircraft hub is subjected to paint fading, inspection, re-paint spraying and the like, the paint spraying system can reduce the labor intensity of workers and improve the operation convenience of the workers.

Description

Technical Field

[0001] This application relates to the field of aircraft component repair technology, and in particular to an aircraft wheel hub painting system. Background Technology

[0002] In the field of aircraft component maintenance, for safety and reliability reasons, aircraft wheel hubs need to be periodically stripped of their paint and subjected to various professional inspections before being repainted. The painting process includes steps such as masking, applying primer, leveling, drying, cooling, re-masking, applying topcoat, leveling, drying, and cooling. Due to the porous nature of the wheel hubs, some areas cannot be painted, while others only require primer, making the process quite complex. Therefore, traditional painting processes involve placing the wheel hubs on a workbench for painting. Typically, one side is painted, and the process is followed by waiting for leveling and drying before painting the other side. The primer and topcoat are applied in sequence, requiring frequent stops and waiting periods, resulting in low work efficiency. Furthermore, the painting process requires workers to lift and flip the wheel hubs, which is not only inconvenient but also, combined with the high temperatures and harsh working environment of the baking room, increases the risk of workplace injuries.

[0003] Therefore, how to reduce the labor intensity of workers and improve the ease of operation when performing tasks such as paint removal, inspection, and repainting of aircraft wheel hubs is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide an aircraft wheel hub painting system that can reduce the labor intensity of workers and improve their ease of operation.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] An aircraft wheel hub painting system, comprising:

[0007] The preparation area is equipped with a lifting machine capable of controlling the raising and lowering of the wheel hub;

[0008] The spraying and drying room is equipped with a spraying area and a drying area, which can spray and dry the wheel hub.

[0009] The circulation chain includes a circulation track and a traveling mechanism that can move along the circulation track, and a first lifting device connected to the traveling mechanism. The circulation track passes through the preparation area, the spraying area, and the drying area and is connected end to end. The first lifting device is used to lift and circulate the wheel hub.

[0010] A bracket is used to install the circulating track and to allow the circulating track to switch between high and low positions in the spraying area so that the upper and lower surfaces of the hub are sprayed sequentially by switching between high and low positions.

[0011] The control system is capable of controlling the walking speed and start / stop cycle of the walking mechanism.

[0012] Optionally, the aforementioned aircraft wheel hub painting system also includes a paint booth:

[0013] The paint booth is located between the preparation area and the integrated spray-drying booth, and is capable of spraying a portion of the wheel hub.

[0014] The circulating track passes through the paint booth and is switched between high and low positions within the paint booth via the bracket, so that the upper and lower surfaces of the wheel hub are painted sequentially by switching between high and low positions.

[0015] Optionally, the above-mentioned aircraft wheel hub painting system also includes a leveling section:

[0016] The leveling chamber is located between the paint spraying chamber and the integrated spray-drying chamber, and the circulating track passes through the leveling chamber.

[0017] Optionally, in the above-mentioned aircraft wheel hub painting system, the brackets in the painting area and the painting booth both include a first mounting position and a second mounting position, wherein:

[0018] The first mounting position can fix the circulating track connected to it at a first horizontal height h1;

[0019] The second mounting position can fix the circulating track connected to it at a second horizontal height h2, where h2 > h1;

[0020] The circulating track forms a ramp-shaped transfer area between the first mounting position and the second mounting position, so that the hub can switch between high and low positions by passing through the ramp-shaped transfer area.

[0021] Optionally, in the above-mentioned aircraft wheel hub painting system, air vents are provided on the top of the spray-drying integrated room and the painting room;

[0022] The sides of the spray-drying room and the paint spraying room are provided with first exhaust vents; and / or, the bottom surfaces of the spray-drying room and the paint spraying room are provided with second exhaust vents.

[0023] Optionally, in the above-mentioned aircraft wheel hub painting system, static pressure chambers are respectively provided on the top of the spray-drying integrated room and the painting room.

[0024] Optionally, in the above-mentioned aircraft wheel hub painting system, the outer side of the air outlet is connected to the air outlet of the circulating heating box;

[0025] The outer side of the first exhaust vent is connected to the waste discharge treatment system; and / or, the outer side of the second exhaust vent is connected to the waste discharge treatment system.

[0026] Optionally, in the above-mentioned aircraft wheel hub painting system, the fan in the waste discharge treatment system and the heater in the circulating heating box are equipped with a time delay interlock module;

[0027] And / or, the spray-drying integrated room and the paint spraying room are equipped with flammable gas alarm devices;

[0028] And / or, the waste discharge treatment system is equipped with a supplementary cooling fan and an electric proportional regulating valve for cooling control;

[0029] And / or, the waste discharge treatment system is equipped with a nitrogen inlet system.

[0030] Optionally, in the above-mentioned aircraft wheel hub painting system, the spray-drying integrated room is provided with a first side door opening that allows the circulating chain to pass through and the wheel hub to enter, and the first side door opening is provided with an air curtain machine.

[0031] Optionally, the above-mentioned aircraft wheel hub painting system also includes:

[0032] A flexible chain, one end of which is connected to the hoist, and the other end of which is provided with a first hook;

[0033] The second lifting device has a first annular portion at one end that can be connected to the first hook, and a second annular portion that can be connected to the second hook of the first lifting device, and the other end is equipped with a multi-claw hanger to lift the wheel hub.

[0034] As can be seen from the above technical solution, the aircraft wheel hub painting system provided in this application utilizes the cyclical conveying characteristics of the circulating chain to simultaneously handle processes such as loading, unloading, transfer, spraying, and drying in the painting process. Specifically, the hoist, in conjunction with the circulating chain, facilitates the loading and unloading of wheel hubs, and the high-low switching method allows for separate spraying of the upper and lower surfaces of the wheel hub, eliminating the need for manual lifting and flipping. This significantly reduces the labor intensity of workers and greatly minimizes workplace injuries caused by lifting heavy objects.

[0035] Moreover, the aircraft wheel hub painting system can automatically transfer the wheel hubs to be painted and those that have been painted through the control system. It can also transfer multiple wheel hubs simultaneously and continuously, ensuring that each process step is executed continuously without stopping or waiting, which greatly improves work efficiency. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the planar layout structure of an aircraft wheel hub painting system provided in an embodiment of this application.

[0038] Figure 2 This is a schematic diagram of the structure of a high-low position switching point of a paint spraying area circulation track provided in an embodiment of this application.

[0039] Figure 3 This is a schematic diagram of the structure of a paint booth provided in an embodiment of this application.

[0040] Figure 4 This is a schematic diagram of the structure of a preparation area provided in an embodiment of this application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Please see Figure 1This application provides an aircraft wheel hub painting system, referred to as a painting system. The painting system mainly includes a preparation area 1, a spray-drying integrated room 4, a circulation chain 11, a support frame, and a control system. Specifically: the preparation area 1 is equipped with a lift 101 capable of controlling the lifting and lowering of the wheel hub 10. The lift 101 can be an electric or hydraulic lifting device used for loading, unloading, wrapping, installing end caps, grinding, and cleaning; the spray-drying integrated room 4 is equipped with a spraying area and a drying area, capable of spraying and drying the wheel hub 10; the circulation chain 11 includes a circulation track 111 and a traveling mechanism capable of moving along the circulation track 111, as well as a first lifting device 112 connected to the traveling mechanism. The circulation track 111 passes through the preparation area, the spraying area, and the drying area. Furthermore, the first lifting device 112 is used to lift and circulate the wheel hub 10, so that when the traveling mechanism moves along the circulating track 111, the wheel hub 10 can be moved by the first lifting device 112; the bracket is used to install the circulating track 111, and by adjusting the height of the bracket, the circulating track 111 can switch between high and low positions in the spraying area, so that the upper and lower surfaces of the wheel hub 10 can be conveniently sprayed by the staff in sequence by switching between high and low positions; at the same time, the traveling speed and start-stop cycle of the traveling mechanism can be controlled by the control system.

[0043] As can be seen, the painting system provided in this application utilizes the cyclical conveying characteristics of the circulating chain to simultaneously handle processes such as loading, unloading, transfer, spraying, and drying in the painting process. Specifically, the elevator 101, in conjunction with the circulating chain, facilitates the loading and unloading of the wheel hub 10. By switching between high and low positions, the upper and lower surfaces of the wheel hub can be sprayed separately, eliminating the need to lift or flip the wheel hub 10, thus significantly reducing the labor intensity of workers and greatly minimizing workplace injuries caused by lifting heavy objects. Furthermore, the control system in this painting system can automatically transfer both the wheel hub 10 to be painted and the painted wheel hub 10, and can simultaneously and continuously transfer multiple wheel hubs 10, ensuring that each process step is executed continuously without waiting, greatly improving work efficiency.

[0044] It should be noted that the phrase "the circulating track 111 switches between high and low positions in the spraying area" in this article refers to the circulating track 111 rising from a lower horizontal position to a higher horizontal position, or descending from a higher horizontal position to a lower horizontal position, so that the hub 10 reaching that position rises or falls accordingly. When the hub 10 is raised to a higher position, it facilitates the spraying of its bottom area by the operator; when the hub 10 is lowered to a lower position, it facilitates the spraying of its top area by the operator.

[0045] For example, in practical implementation, a first mounting position and a second mounting position with different horizontal heights can be set on the bracket (not shown in the figure) located in the spraying area of ​​the integrated spray-drying room 4. For example, Figure 2 As shown: the first mounting position can fix the circulating track 111 connected to it at a first horizontal height h1; the second mounting position can fix the circulating track 111 connected to it at a second horizontal height h2, h2>h1; thus the circulating track 111 forms a ramp-shaped transfer area 111x between the first mounting position and the second mounting position, which enables the hub 10 to switch between high and low positions through the ramp-shaped transfer area 111x.

[0046] Furthermore, the spraying area of ​​the integrated spray-drying booth 4 is equipped with a drive mechanism at the spraying station for automatically rotating the first hanger 112 with the wheel hub 10, facilitating spraying along the circumference of the wheel hub by the operator. Moreover, the first hanger 112, located at different heights, can be driven to rotate by drive mechanisms at different heights. For example, please refer to... Figure 2 Before the wheel hub 10 reaches the ramp-shaped transfer area 111x, when it is at the first horizontal height h1 and reaches the first painting station, the first lifting device 112 on which the wheel hub 10 is located is driven to rotate by the first drive mechanism 12', so that the workers can spray the top area of ​​the wheel hub 10; after the wheel hub 10 passes through the ramp-shaped transfer area 111x, when it is at the second horizontal height h2 and reaches the second painting station, the first lifting device 112 on which the wheel hub 10 is located is driven to rotate by the second drive mechanism 12", so that the workers can spray the bottom area of ​​the wheel hub 10.

[0047] Correspondingly, the spraying area of ​​the integrated spray-drying room 4 is designed with two spraying stations: a high one (lowest point approximately 1500mm from the ground) and a low one (highest point approximately 1100mm from the ground). This allows for the spraying of both the upper and lower surfaces of the wheel hub 10, while reducing the workload of operators and preventing occupational injuries. Each of the high and low spraying stations is equipped with a drive mechanism (i.e., the first drive mechanism 12' and the second drive mechanism 12") to drive the first lifting device 112 to rotate the wheel hub 10 around its own central axis. This facilitates circumferential spraying by the operator and promotes uniform distribution of the spraying material. After the operator finishes spraying the wheel hub 10 at the low station, the travel mechanism of that wheel hub 10 is moved forward one station to continue spraying the next wheel hub 10. Similarly, after the operator finishes spraying the wheel hub 10 at the high station, the travel mechanism of that wheel hub 10 is moved forward one station to continue spraying the next wheel hub 10. The traveling mechanism containing the hub 10 moves forward step by step to continue subsequent leveling / drying processes. In specific implementation, after the two hubs 10 at the lower station have finished spraying, when the first completed hub 10 at the lower station moves to the rotation point of the higher station, the worker can move with it to the higher station to wait for the hub 10 to arrive before spraying it. That is to say, the two hubs 10 are sprayed together by the worker. Because in order to ensure the height difference between the high and low stations, one hub 10 will stop in the sloping transfer area 111x in the middle. This height is not suitable for spraying and cannot rotate.

[0048] As can be seen, the spraying area of ​​the integrated spray-drying booth 4 is equipped with the aforementioned sloping transfer area 111x, as well as the first drive mechanism 12' and the second drive mechanism 12'", which enables the wheel hub 10 to automatically switch between high and low positions. During the production process, the painting staff only need to spray paint the wheel hub upwards or downwards from a fixed workstation. The spraying direction is basically fixed, and the staff basically do not need to move around, thereby reducing the labor intensity of the staff and also reducing the harm of paint mist to the human body to a certain extent. Moreover, the spraying process does not require the staff to enter the baking room, thereby reducing the risk of high temperature burns and improving the working environment as a whole.

[0049] In practice, given that a certain amount of VOCs (volatile organic compounds) will be released during the paint mixing process, a paint mixing room 9 is also provided for safety. The paint mixing room 9 needs to be sealed and isolated, and is designed with a forced exhaust system to ensure a clean and safe working environment.

[0050] Furthermore, for relatively small workpieces such as wheel brakes, in order to improve production efficiency and reduce equipment energy consumption during painting, the painting system provided in this application also includes a separate small-part painting booth (i.e., for pre-painting small workpiece areas in the wheel hub 10) designed to improve production efficiency and reduce equipment energy consumption during painting. Figure 1 The painting booth 2) and leveling booth 3 are shown in the diagram. Figure 1 As shown, preparation area 1, spray painting booth 2, leveling booth 3, and integrated spray-drying booth 4 are arranged sequentially along the conveying direction of the circulating track 111. Spray painting booth 2 and leveling booth 3 allow for pre-painting and leveling of certain areas (e.g., the area containing small workpieces) of the wheel hub 10 before it enters the integrated spray-drying booth 4. To facilitate separate painting of the upper and lower surfaces of the wheel hub 10 by operators, the circulating track 111 within spray painting booth 2 is equipped with a support system that allows for high-low position switching, enabling operators to sequentially paint the upper and lower surfaces of the wheel hub 10. Specifically, as... Figure 2 As shown, in order to allow the upper and lower surfaces of the wheel hub 10 to be painted separately in the paint booth 2, the circulation track 111 in the paint booth 2 is also equipped with the inclined transfer area 111x mentioned above. Thus, the circulation track 111 and the wheel hub 10 in the paint booth 2 achieve high-low position switching through the inclined transfer area 111x. Its specific structure and working process are similar to... Figure 2 The sloped transfer area 111x of the spraying zone 4 in the integrated spraying and baking room mentioned above is basically the same, and will not be described again here.

[0051] In addition, the circulating track 111 in the leveling room 3 can also be switched between high and low positions via the bracket, so that the hub 10 is lowered from a higher position to a lower position, in preparation for the high and low position switching in the spray-drying integrated room 4.

[0052] In some embodiments, air vents are provided on the top of the integrated spray-drying room 4 and the painting room 2. First exhaust vents are provided on the sides of the integrated spray-drying room 4 and the painting room 2, thereby achieving upward supply and side exhaust to promptly remove paint mist generated during spraying; and / or, second exhaust vents can also be provided on the bottom surface of the integrated spray-drying room 4 and the painting room 2, thereby achieving upward supply and downward exhaust to promptly remove paint mist generated during spraying. The outer side of the air vents is connected to the air outlet of the circulating heating box 5, and the outer sides of both the first and second exhaust vents are connected to the waste discharge treatment system 6.

[0053] In practical implementation, the circulating heating chamber 5 can adopt an electric heating system to achieve the function of heating and spraying paint when the winter temperature is below 15℃, and at the same time achieve the function of baking paint at a maximum temperature of 80℃. Moreover, the circulating heating chamber 5 is equipped with a two-stage temperature control device, and the temperature uniformity is no greater than ±6℃.

[0054] In practice, a fixed station for painting small workpieces on the wheel hub 10 can be set up in the paint booth 2, and the indoor air can be filtered by side suction or top supply and bottom exhaust. A fixed station for painting large parts such as structural components on the wheel hub 10 can be set up in the central area of ​​the spray-drying integrated booth 4, and the indoor air can be heated and filtered by top supply and bottom exhaust. Moreover, galvanized steel plate grilles and air outlet filter structures are respectively installed at the first air outlet on the side of the spray-drying integrated booth 4 and the paint booth 2, as well as at the second air outlet on the bottom of the spray-drying integrated booth 4 and the paint booth 2. The air outlet filter structure can be paint mist filter cotton.

[0055] In some embodiments, the painting system employs a reinforced concrete base ventilation system and is equipped with steel galvanized grating plates, paint mist filter materials, filter media guide nets, longitudinal beams, and transverse beams to ensure smooth and uniform airflow discharge and a high capture rate of oversprayed paint. At the same time, a reinforced concrete equipment platform with a thickness of no less than 300mm is designed on the outside of the workshop to meet the needs of equipment placement and subsequent maintenance.

[0056] Please see Figure 2 and Figure 3 In some embodiments, the top of the spray-drying integrated room 4 and the painting room 2 are respectively provided with static pressure chambers 502 to achieve uniform downward airflow and prevent airflow from flowing across the room. Moreover, the bottom of the static pressure chamber 502 is provided with an air inlet filter structure 503 (e.g., filter cotton) to prevent dust and other impurities from contaminating the painting process. Furthermore, the air inlet filter structure 503 helps clean air to flow vertically and evenly into the room, forming an air curtain around the hub 10, so that residual paint mist does not diffuse to the surroundings.

[0057] In practice, two filter layers can be installed in the spray-drying integrated room 4 and the painting room 2 respectively, equipped with a structural anti-corrosion support. The coarse filter layer can effectively capture dust particles with a diameter greater than 10um, and the precision-grade sub-high efficiency filter cotton can effectively capture dust particles greater than 5um, with a filtration efficiency of over 98%.

[0058] In some embodiments, the fan in the waste discharge treatment system 6 and the heater in the circulating heating box 5 are equipped with a time-delay interlock module. Specifically, the heater cannot work when the fan is not turned on, and the fan delays for about 3 minutes after the heater stops working. When the paint baking temperature reaches the set time, the control system will automatically shut down, and the supply and exhaust fans will automatically delay for about 3 minutes.

[0059] Please see Figure 4 In some embodiments, the hoisting position of the hoist 101 in the preparation area 1 is provided with a flexible chain 102 and a second lifting device 13, which can horizontally hoist the suspended wheel hub 10. Specifically: one end of the flexible chain 102 is connected to the hoist 101, and the other end is provided with a first hook 103; one end of the second lifting device 13 is provided with a first annular portion 131 that can connect to the first hook 103, and a second annular portion 132 that can connect to the second hook of the first lifting device 112, and the other end is used to hoist the wheel hub 10 via a multi-claw hanger 133. In some embodiments, the multi-claw hanger 133 includes a connecting claw 1331 and two or more balancing claws 1332, wherein: the connecting claw 1331 is aligned with and detachably connected to the center of the hub 10; the balancing claws 1332 are fixedly connected to the connecting claw 1331 and detachably connected to the hub 10; moreover, the two or more balancing claws 1332 are symmetrically arranged on both sides of the connecting claw 1331, and / or, the two or more balancing claws 1332 are arranged sequentially around the circumference of the connecting claw 1331. Thus, the balancing claws 1332 can help improve the stability of the hub 10 during transport and rotation.

[0060] In some embodiments, the spray-drying integrated room 4 is provided with a first side door opening 41 that allows the circulating chain 11 to pass through and the wheel hub 10 to enter; preferably, the first side door opening 41 is provided with an air curtain to prevent paint odor from escaping. In addition, the spray-drying integrated room 4 is also provided with a second side door opening 42 to facilitate the entry and exit of workpieces; optionally, the second side door 42 can be a folding door or a roller shutter door, and uses fire-resistant and explosion-proof materials, such as an electrically operated roller shutter door with an explosion-proof motor. For example, in some embodiments, the internal dimensions of the working area of ​​the spray-drying integrated room 4 are not less than 11000mm in length, 5000mm in width, and 3000mm in height. The second side door opening 42 is a large door with dimensions not less than 3000mm wide × 2800mm high; the first side door opening 41 is a small door, with dimensions of 800mm wide × 2000mm high; the floor of the spray-drying integrated room 4 is flush with the paint preparation room to facilitate the entry and exit of workpieces. The explosion-proof roller shutter door lifting slide rail is made of non-sparking material, with a sturdy structure, easy opening and closing, and ensures that the explosion-proof roller shutter door will not bulge outward when closed and will not deform after long-term use. The door and foundation design should fully consider the airtightness after the door is closed to prevent air leakage at the door gaps and the junction between the door and the ground, and ensure that paint mist does not leak out during spray painting.

[0061] In summary, the production capacity of the painting system provided in this application is at least sufficient to allow 10 sets of 747 wheel hubs (20 inner and outer half-wheel hubs) to be painted and baked (i.e. dried) in succession. Other wheel hub models can be adjusted appropriately according to their size and weight. The total weight of the baking chamber and the suspension chain frame is not less than 1.0 ton, and the single-point load-bearing capacity is not less than 75 kg.

[0062] In some embodiments, the paint spraying system can use prefabricated rock wool color steel insulation panels with a thickness of not less than 50mm, with both inner and outer steel plates having a thickness of 0.5mm or more, and a service life of more than 10 years; the lighting system can use LED lighting units, with a detachable explosion-proof shell on the outside, and the arrangement of the lamps makes the light inside the room soft, without shadows, and with uniform and bright illumination, and the illuminance is not less than 500 lux (lux is a unit of illuminance, legal symbol lx); the exhaust gas treatment method adopts dry filtration plus activated carbon catalytic combustion, and is designed with a nitrogen system connection, the discharge height of the main exhaust duct 8 is not less than 15 meters, and the auxiliary facilities facilitate sampling by environmental monitoring agencies. In specific implementation, the main exhaust duct 8 can be made of galvanized steel plate with a thickness of not less than 1.5mm, and the top is equipped with a special rain cap to ensure that the airflow is unobstructed vertically upward while preventing rainwater from flowing back into the exhaust duct.

[0063] In some embodiments, the spray painting system can be configured with two air supply systems, each equipped with two dual-inlet external rotor explosion-proof centrifugal fans, with an air supply volume of over 15,000 m³ / h per fan, and a total fan volume exceeding 60,000 m³ / h. Air within the spray booth flows uniformly from top to bottom, with air supplied from above and exhausted from below, circulating in a completely downward direction at a speed of over 0.3 m / s under load. Furthermore, the spray painting system can be equipped with an exhaust system using an explosion-proof centrifugal exhaust fan 7, with an exhaust volume of not less than 50,000 m³ / h, characterized by large air volume and low noise. This intake and exhaust design is reasonable, not prone to clogging, and provides excellent exhaust performance.

[0064] In some embodiments, the control system of this painting system adopts an intelligent touch screen explosion-proof operating system assembled with advanced electronic components. It uses an explosion-proof touch screen control cabinet inside the workshop + a PLC (Programmable Logic Controller) frequency converter main control cabinet outside the workshop, with a dedicated control program, ensuring safety, reliability, convenient and flexible operation, and multiple safety protection functions. It is equipped with a power switch, emergency stop switch, buzzer, temperature controller, and three-phase energy meter. The touch screen displays a paint spraying switch, a paint baking switch, a lighting switch, a desorption switch, and related equipment operation status indicator lights, designed paint baking parameters such as temperature and time, a desorption flowchart, a manual control display interface, an alarm display interface, and a maintenance and management interface.

[0065] In some embodiments, the power supply for this painting system is a three-phase five-wire system with a voltage of 380V and a power of ≤300KW. All electrical connections inside the equipment workshop are installed using explosion-proof wiring, while cable trays are used for wiring outside the workshop.

[0066] In some embodiments, the safety system in the painting system includes:

[0067] 1) If the work area is an enclosed area, a pressure relief safety door and a pedestrian safety door must be designed. Pressure protection devices are installed on the doors. When the air pressure inside the room exceeds the specified pressure standard of 140Pa, the pedestrian safety door will be opened automatically to relieve pressure, ensuring that the entire system is absolutely safe and reliable.

[0068] 2) Temperature control adopts dual temperature control, that is, it is equipped with dual temperature control (i.e., two independent temperature control systems) to prevent fire caused by single temperature control failure and excessive temperature rise, and to ensure safe operation of the equipment. When the indoor temperature exceeds the set value, the power will be automatically cut off to ensure safety.

[0069] 3) The entire control system is designed with an intelligent control system, which has multiple protections such as explosion protection, phase loss protection, and misoperation protection. It adopts active protection in terms of safety.

[0070] 4) The fan in the waste discharge treatment system 6 and the heater in the circulating heating box 5 have a time delay interlock function. The heater cannot work when the fan is not turned on. After the heater stops working, the fan will delay for about 3 minutes. When the baking temperature and time reach the set point, the control system will automatically shut down, and the supply and exhaust fans will automatically delay for about 3 minutes.

[0071] 5) The spray painting system (especially the spray baking room 4 and the spray painting room 2) is equipped with a combustible gas alarm device. When the concentration of combustible gas in the room exceeds the standard, it can automatically issue an audible and visual alarm and start the ventilation unit to quickly exhaust the combustible gas in the spray baking room to avoid the risk of fire.

[0072] 6) The waste discharge treatment system is equipped with a supplemental cooling fan and an electrically operated proportional regulating valve for easy temperature control. For example, ... Figure 3 As shown, the spray booth 2 and the spray-drying integrated booth 4 are equipped with a first exhaust vent and an exhaust filter structure 601. An exhaust chamber 602 is provided outside the side wall. The top outlet of the exhaust chamber 602 is connected to an exhaust pipe 604 and a fire-resistant regulating valve 603.

[0073] 7) The waste discharge treatment system is equipped with a nitrogen inlet system to prevent the risk of spontaneous combustion due to overheating of the carbon box during the activated carbon desorption process. Nitrogen is added in time to suppress combustion.

[0074] 8) If any pneumatic butterfly valve in the adsorption and desorption channels malfunctions, an alarm will be triggered immediately and the location of the alarm butterfly valve will be displayed.

[0075] 9) Desorption pipelines are equipped with dedicated flame arresters and explosion-proof pressure relief systems.

[0076] In some embodiments, each work area of ​​the painting system is equipped with a compressed air pipeline and at least two quick connectors for convenient use of compressed air during painting. Since a waste disposal system is located outside the workshop, a rain shelter is required to prevent rainwater corrosion of the equipment. The dimensions of the rain shelter will be determined based on the installation conditions after the equipment is installed. It will be constructed using 100mm×100mm and 80mm×40mm steel pipes and 0.5mm thick gray corrugated board or equivalent materials, and will be equipped with a water collection trough, PVC drainage pipe assembly, inspection door, ventilation louvers, LED spotlights, and switches. Because the equipment is close to the helipad, the stability of the rain shelter in windy conditions must be considered to prevent the roof from collapsing and entering the helipad.

[0077] In some embodiments, the spray-drying integrated room 4 and the painting room 2 should maintain indoor air velocity and slight negative pressure during painting; the indoor no-load air velocity of the painting room should be ≥0.3m / s. The fresh air supplied during painting uses multi-stage filtration (primary, medium, and high-efficiency filters) to effectively filter dust particles ≥5μm, ensuring a safe working environment during painting, reducing contamination sources for the workpiece, and improving the surface quality of the painted workpiece. The painting room adopts an upward air supply and bottom exhaust method. The dry paint mist filtration uses a combination of paint mist filter cotton and medium-efficiency filter bags. The paint mist filter cotton is located near the exhaust port at the bottom or side of the room, and the medium-efficiency filter bags are located in the waste discharge treatment system 6. Furthermore, the interior of the painting room has compressed air branches evenly distributed to the left and right along its length, equipped with multiple air source points to meet the compressed air requirements during painting.

[0078] During spray painting, turn on all supply and exhaust fans and lights, and close the return air valve. If heating is required for spray painting in winter or dehumidification is needed during the rainy season, the heating device must be turned on. First, outside air enters the main unit's fan chamber after passing through a primary filtration section. The fan in the fan chamber then delivers the filtered air through the air supply duct into the static pressure chamber at the top of the chamber. High-efficiency filter cotton at the bottom of the static pressure chamber further filters and traps solid dust. Clean air flows vertically and evenly into the chamber, forming an air curtain around the workpiece, preventing residual paint mist from spreading. At this time, the air velocity inside the chamber is approximately 0.3 m / s. Under the action of this high-speed airflow, residual paint mist will not linger near the operator's breathing zone but will descend with the airflow. Driven by the exhaust fan, the airflow carrying paint mist passes through the return air duct and is mostly adsorbed by the filter cotton. A small amount of remaining harmful gas enters the activated carbon adsorption device inside the main unit for filtration. After being treated by activated carbon adsorption, it is discharged outdoors through the exhaust duct, meeting the emission requirements for purified exhaust gas.

[0079] During the paint baking process, turn on the supply fan, heating device, and return air valve. Close the exhaust valve and all lighting. Filtered air enters the main unit fan chamber, where the supply fan sends it into the heat exchanger located in the upper hot chamber. The hot air then enters the static pressure chamber, passes through the filter layer in the static pressure chamber, and flows into the main unit fan chamber. The hot air then flows back into the main unit fan chamber through the return air trough, passing through the paint mist filter and activated carbon adsorption device, forming a hot air circulation.

[0080] In some embodiments, the exhaust system of the painting system provided in this application is specifically designed as follows:

[0081] 1) The exhaust system consists of an exhaust fan, exhaust pipe, and air valve.

[0082] 2) The paint mist filtration in the integrated spray-drying room 4 and the painting room 2 adopts dry paint mist filtration, with a total of two paint mist filtration devices. The first stage is the paint mist filter cotton under the pit grid in the room, and the second stage is a medium-efficiency bag filter in the paint mist filter box located at the front end of the catalytic combustion equipment. Through the above two filtrations, the total paint mist removal efficiency reaches more than 90%. The design structure of the filtration device can meet the production needs and is convenient for opening, maintenance and replacement.

[0083] 3) The catalytic combustion activated carbon adsorption box in the waste gas treatment system 6 is made of Q235 carbon steel, painted on the outside, and contains a certain amount of activated carbon. It is equipped with a wind pressure detection device. When waste gas containing organic matter is blown by a fan through the activated carbon adsorption layer (neatly stacked), the organic matter is trapped inside by the unique force of the activated carbon, and clean gas is discharged. After a period of time, when the activated carbon reaches saturation, adsorption stops. At this point, the organic matter has been concentrated within the activated carbon, which is honeycomb activated carbon. There are two stages of activated carbon adsorption layers, which can fully absorb VOCs in the exhaust gas, meeting national emission standards.

[0084] 4) The exhaust fan adopts the Nanfang 4-72 type explosion-proof centrifugal fan, which uses frequency conversion control to send the air after paint mist treatment into the activated carbon adsorption waste gas treatment device. The exhaust volume corresponds to the air supply volume. Through frequency conversion control, the equipment generates a slight negative pressure to prevent unclean external air from entering the equipment and affecting the spraying quality.

[0085] 5) The exhaust duct cross-section shall be manufactured in accordance with the requirements of national ventilation standards. The material used shall be galvanized sheet. The exhaust duct construction and exhaust outlet height shall be designed and constructed in accordance with relevant national standards and specifications. The exhaust outlet installation height shall not be less than 15 meters. If the factory building height exceeds 15 meters, the height shall be 2-3 meters above the factory building height. The exhaust duct must be durable, sturdy, and have sufficient rigidity to prevent vibration.

[0086] In some embodiments, the circulating heating box for air supply heating in the painting system provided in this application uses superconducting electric heat pipes for heating and features a hot air circulation design, which can achieve good temperature uniformity. The heating device mainly consists of a hot chamber, heating elements, and a circulating fan. Wherein:

[0087] 1) The hot chamber is composed of steel profiles and insulation panels, and an electric heater and support are installed inside. It is installed on the side of the integrated spray booth, which minimizes the length of the circulation pipes, reduces space occupation and heat loss, provides good insulation performance, and facilitates inspection and maintenance. An inspection door is provided on the side of the hot chamber.

[0088] 2) The heating element adopts stainless steel finned heating tube, which has the advantages of large heat dissipation area, fast heating, energy saving and long service life, and is widely used in coating engineering.

[0089] 3) The heating elements are divided into multiple groups. After reaching the set temperature, some are kept warm while others are supplemented with heat. The specific temperature control method is controlled by a high-precision temperature controller.

[0090] 4) The circulating heat preservation fan adopts a special circulating fan with double air inlet, with a circulating air volume of 15000m3 / h, low noise, and static pressure of 800pa. Each heating chamber is equipped with two circulating fans, and the speed of each fan is controlled by frequency converter to adjust the air volume. This can achieve uniform air circulation in the spray-drying integrated room. When spraying small workpieces, one fan in the nearest heating chamber can supply air to the small workpiece spray booth at room temperature. This is achieved by cooperating with electric air valves and ventilation ducts.

[0091] 5) The heating system adopts a high-precision temperature control display instrument from the well-known Japanese brand Shimaden, and is equipped with a Simanton SCR rectifier for temperature control. This allows for highly reliable control of high-power heating, resulting in good temperature control and ensuring excellent temperature uniformity.

[0092] In some embodiments, the lighting system of the spray painting system provided in this application uses explosion-proof fluorescent lamps with multiple sets to ensure that the lighting system in the room maintains a light intensity greater than 500 lux. All lamp sets are equipped with easily removable explosion-proof protective covers, which can be easily cleaned and replaced when contaminated by paint mist. Standard high-brightness lamp tubes with a length of 1200 mm are used for easy maintenance.

[0093] In some embodiments, the circulating conveyor chain in the painting system provided in this application allows for flexible selection of the loading and unloading positions, effectively utilizing space, saving manpower, and improving efficiency. It consists of components such as a chain, track, bracket, transmission seat, and adjustment seat. Employing a suspended conveyor structure, it boasts an attractive appearance, compact structure, smooth operation, convenient speed adjustment, long service life, few malfunctions, and easy maintenance. Combining the special structural form of the wheel brakes with consideration for suspension stability, it adopts a conveyor system along... Figure 4The second lifting device structure shown adopts a three-jaw hanger with symmetrical arrangement of the central shaft hole. The top of the hanger has a double-ring structure, which facilitates simultaneous hooking of the conveyor chain hook and the hoist hook during loading and unloading, making it convenient and practical. The loading and unloading area has high and low positions, and uses a movable explosion-proof electric hoist to load and unload workpieces. Workpieces can be lifted directly from the incoming material pallet, reducing the workload of personnel handling. The suspension conveying method adopts a stepping type, with a fixture hanging point every 250mm. The top of each hanging point is a double-point beam trolley, and the single hanging point load exceeds 75 kg. The center distance of large workpieces is about 1500mm, and up to 26 workpieces can be suspended at the same time in the spray drying room. In order to ensure that the low position in the paint booth 2 is as low as possible and to ensure the passage of large parts in the unloading area, the track in the unloading area turns to the outside of the paint booth 2 and descends to a certain height before entering the paint booth 2. After reaching the painting station, the automatic conveying stops and the workpiece begins to rotate automatically. The operator only needs to complete the painting action, minimizing the operator's workload, while meeting the requirements of circular surface spraying. The spray booth 2 is equipped with a sloping transfer area 111x, which allows two operators at two stations to simultaneously spray the top and bottom of the wheel hub 10, or one person to operate the spraying of the top and bottom surfaces. This requires the workpieces to be suspended one station apart. After spraying, the line can be manually reset to continue moving, or the PLC can be used to set a spraying waiting time to automatically reset the line movement.

[0094] In some embodiments, the traveling mechanism in the circulating chain 11 includes a conveyor chain and a linear drive device. Furthermore, the circulating chain 11 is also equipped with a counterweight tensioning device, a drip lubrication device, a track temperature expansion joint, a mounting bracket, a safety net, and an electrical control system. Among these:

[0095] 1) The conveyor rails are made of slotted square steel pipes and consist of straight rails, horizontal curved rails, uphill and downhill curved rails, temperature-controlled expansion rails, inspection rails, etc. Each straight rail is supplied in 6-meter length.

[0096] 2) The conveyor chain consists of traveling wheels, guide wheels, and chain links. After a lifting device is attached to the center of the traveling wheel's pivot pin, it can suspend and transport objects. Both the traveling wheels and guide wheels use a ball-bearing wheel structure. This chain plays the role of suspending and transporting objects in the conveyor line; in addition to linear motion, it can also move in curves following the curvature of the track.

[0097] 3) The linear drive unit consists of a speed-regulating motor, a reducer, drive tracks, drive sprockets, mounting brackets, and dual mechanical and electrical protection. The mechanical protection is a shear pin type, and the electrical protection is an overcurrent type.

[0098] 4) The counterweight tensioning device consists of a fixed frame, a floating frame, pulleys, and a counterweight plate. Its function is to maintain a relatively stable tension throughout the entire conveyor line during operation. It also absorbs or compensates for the expansion and contraction of the chain due to thermal expansion and contraction and stress deformation during operation, making it widely applicable. The tensioning stroke is typically around 300mm.

[0099] 5) The oil dripping lubrication device is installed at the far end of the oven outlet. It can automatically drip oil onto the walking wheels, guide wheels, pins, etc. of the conveyor chain to reduce the wear of related parts and reduce the coefficient of friction, so as to ensure that the conveyor chain works in a good lubrication condition for a long time.

[0100] 6) When the conveyor line passes through an area with large temperature variations, the track temperature expansion joint can absorb the expansion and contraction of the track and play a compensating role.

[0101] 7) The mounting bracket is mainly used to support the conveyor. Depending on the needs, the structure is a single-arm Γ-type suspended type or П-type gantry steel structure.

[0102] 8) In the electrical control system, the control of the conveyor line is generally centralized, with the start and stop of the drive motor controlled by the master switch in the control cabinet. An emergency stop button is installed at a suitable operating position.

[0103] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed.

[0104] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0105] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An aircraft wheel hub painting system, characterized in that, include: The preparation area (1) is equipped with a lifting machine (101) that can control the lifting and lowering of the wheel hub (10); The spraying and drying room (4) is equipped with a spraying area and a drying area, which can spray and dry the wheel hub (10); The circulation chain (11) includes a circulation track (111) and a traveling mechanism that can move along the circulation track (111), and a first lifting device (112) connected to the traveling mechanism. The circulation track (111) passes through the preparation area (1), the spraying area, and the drying area and is connected end to end. The first lifting device (112) is used to lift and circulate the hub (10). A bracket is used to install the circulating track (111) and to allow the circulating track (111) to switch between high and low positions in the spraying area so that the upper and lower surfaces of the hub (10) are sprayed sequentially by switching between high and low positions. The control system is capable of controlling the walking speed and start / stop cycle of the walking mechanism.

2. The aircraft wheel hub painting system according to claim 1, characterized in that, It also includes the paint booth (2): The spray booth (2) is located between the preparation area (1) and the spray-drying integrated booth (4), and can spray a portion of the wheel hub (10); The circulating track (111) passes through the paint booth (2) and is switched between high and low positions in the paint booth (2) by the bracket, so that the upper and lower surfaces of the hub (10) are sprayed sequentially by switching between high and low positions.

3. The aircraft wheel hub painting system according to claim 2, characterized in that, It also includes the leveling area (3): The leveling chamber (3) is located between the spray painting chamber (2) and the spray-drying integrated chamber (4), and the circulating track (111) passes through the leveling chamber (3).

4. The aircraft wheel hub painting system according to claim 2, characterized in that, The brackets in both the spraying area and the spray booth (2) include a first mounting position and a second mounting position, wherein: The first mounting position can fix the circulating track (111) connected thereto at a first horizontal height h1; The second mounting position can fix the circulating track (111) connected thereto at a second horizontal height h2, where h2 > h1; The circulation track (111) forms a ramp-shaped transfer area (111x) between the first mounting position and the second mounting position, so that the hub (10) can switch between high and low positions by passing through the ramp-shaped transfer area (111x).

5. The aircraft wheel hub painting system according to claim 2, characterized in that, Air vents are provided on the top of the spray drying room (4) and the paint spraying room (2); The sides of the spray-drying integrated room (4) and the painting room (2) are provided with first exhaust vents; and / or, the bottom surfaces of the spray-drying integrated room (4) and the painting room (2) are provided with second exhaust vents.

6. The aircraft wheel hub painting system according to claim 5, characterized in that, The top of the spray-drying integrated room (4) and the painting room (2) are respectively provided with static pressure chambers (502).

7. The aircraft wheel hub painting system according to claim 5, characterized in that, The outer side of the air outlet is connected to the air outlet of the circulating heating box (5); The outer side of the first exhaust vent is connected to the waste discharge treatment system (6); and / or, the outer side of the second exhaust vent is connected to the waste discharge treatment system (6).

8. The aircraft wheel hub painting system according to claim 7, characterized in that, The blower in the waste discharge treatment system (6) and the heater in the circulating heating box (5) are equipped with a time delay interlock module; And / or, the spray drying room (4) and the paint spraying room (2) are equipped with flammable gas alarm devices; And / or, the waste discharge treatment system (6) is equipped with a supplementary cooling fan and an electric proportional regulating valve for cooling control; And / or, the waste discharge treatment system (6) is equipped with a nitrogen inlet system.

9. The aircraft wheel hub painting system according to any one of claims 1 to 8, characterized in that, The spray-drying integrated room (4) is provided with a first side door opening (41) that allows the circulating chain (11) to pass through and the wheel hub (10) to enter, and the first side door opening (41) is provided with an air curtain machine.

10. The aircraft wheel hub painting system according to any one of claims 1 to 8, characterized in that, Also includes: A flexible chain (102) is connected at one end to the elevator (101) and at the other end is provided with a first hook (103); The second lifting device (13) has a first annular portion (131) that can be connected to the first hook (103) and a second annular portion (132) that can be connected to the second hook of the first lifting device (112) at one end, and the other end is used to lift the wheel hub (10) by a multi-claw hanger (133).

Images