Automatic spraying device for metal sheet products

Abstract

The present invention discloses an automatic spraying device for metal sheet products, which belongs to the field of spraying equipment; it includes a paint spraying room, a feeding device and a spray head. The spray head is flexibly moved in the paint spraying room by a lifting device, and the conduit is connected to the paint spraying equipment through a side wall groove. A paint blocking structure is provided in the side wall groove, and a folding plate is used for dynamic sealing to prevent paint mist leakage. The feeding device transports the workpiece through a pulley hanging rail and a lifting head, and is equipped with a posture fine-tuning structure. It uses a rotating rod and a cylinder drive to correct the angle inclination and spacing deviation of the lifting head caused by belt tensioning, ensuring that the workpiece enters the paint spraying room accurately. A gas escape capture device is provided in the paint spraying room, which includes an in-room capture structure and an inlet and outlet capture structure. Paint mist and VOCs are efficiently collected through multi-stage ventilation slots and exhaust pipes, and the emissions meet environmental protection standards. This equipment has precise spraying, a high degree of automation, and a modular design that facilitates maintenance. It is suitable for industrial painting scenarios such as automotive parts, and significantly improves painting quality, production efficiency and environmental protection performance.

Description

Technical Field

[0001] The invention relates to an automatic spraying device for metal plate products, belonging to the field of spraying equipment. Background Art

[0002] In the production of sheet metal products, spraying is a critical process for improving product surface quality and corrosion resistance. With the advancement of Industry 4.0 and environmental regulations, modern spray painting equipment must balance high precision, high efficiency, and low emissions. However, traditional spray painting equipment faces numerous technical bottlenecks in practical applications. First, the nozzle lifting mechanism within the spray booth is typically connected to an external drive device through a sidewall opening to achieve vertical movement of the nozzle. However, these sidewall openings can easily become channels for paint mist to leak. Paint mist and volatile organic compounds (VOCs) generated during the painting process can escape through these openings, polluting the environment and affecting the normal operation of the spray painting equipment, while also posing a health threat to operators. Existing sealing measures, such as fixed baffles or rubber sealing strips, often struggle to accommodate the dynamic movement requirements of the lifting mechanism.

[0003] Secondly, the feeding mechanism in traditional paint spraying equipment often utilizes a pulley rail and lifting head structure, with workpieces fed into the paint booth via a belt drive. As a flexible transmission component, the belt can become loose due to stretching or wear after prolonged operation, requiring a tensioning device to restore tension. However, after the belt is tensioned, the mounting angle of the lifting head often tilts slightly, preventing the lifted workpiece (such as a metal sheet) from entering the paint booth in the desired position, affecting the uniformity of the paint spray. Furthermore, the tensioning process can cause localized stretching or compression of the belt, shifting the spacing between adjacent lifting heads. This can affect the timing of the automated painting process, resulting in insufficient or excessive paint spraying on some workpieces and reduced paint quality.

[0004] Furthermore, paint mist and VOCs generated during the painting process are significant sources of environmental pollution. Traditional painting equipment typically relies on bottom-mounted exhaust devices for gas collection, but this capture efficiency is low, especially at the entrance and exit areas of the paint booth, where workpieces entering and exiting can easily cause gas to escape. Summary of the Invention

[0005] The object of the present invention is to provide an automatic spraying device for metal sheet products, which can effectively solve the above-mentioned problems.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The system comprises a paint spraying room, a feeding device and a spray head arranged in the paint spraying room, wherein the spray head can be moved up and down in the paint spraying room by a lifting device, wherein the lifting device is arranged outside the paint spraying room and extends into the paint spraying room through a conduit and is connected to the spray head, and the conduit is externally connected to the paint spraying equipment;

[0008] The side wall of the paint spraying room is provided with a side wall groove for the conduit to extend into and provide a lifting space, and a paint blocking structure is provided in the side wall groove; the paint blocking structure includes a mounting frame that fits with the groove surface of the side wall groove, and a lifting frame for installing the conduit and allowing the conduit to extend into the paint spraying room is provided in the mounting frame, and folding plates are provided at the upper and lower ends of the lifting frame, and the other end of the folding plate is connected to the upper and lower frame walls of the mounting frame.

[0009] Further: the folding plate includes a connecting head and a bending plate connected to the connecting head;

[0010] Furthermore: the connecting head is made of stainless steel, and the bending plate is made of flexible deformable material.

[0011] Furthermore: one end of the bending plate is connected to a baffle, and the baffle material is stainless steel.

[0012] Furthermore: a limiting device for limiting the lifting range of the catheter is provided on the installation frame; the limiting device includes a movable plate located on the side of the lifting frame and a limiting plate provided on the installation frame, above and below the lifting frame.

[0013] Furthermore: the limiting device also includes a lifting space arranged on the mounting frame for allowing the movable plate to be lifted and lowered, and the lifting space is composed of an inner wall of a limiting frame arranged on the side of the mounting frame; a mounting plate is provided on the side of the vertical frame of the mounting frame, the limiting frame is fixed on the side of the mounting plate, and a through groove is provided on the mounting plate, one side of the limiting frame is open and connected to the through groove, and the movable plate extends into the limiting frame through the through groove.

[0014] Further: an adjustment device for adjusting the upper and lower positions of the limit plate is provided on the side of the mounting plate; the adjustment device includes an adjustment slot passing through the limit frame and a clamping bolt threadedly connected to the limit plate, the limit plate is arranged in the limit frame, and the clamping bolt passes through the adjustment slot and is threadedly connected to the limit plate.

[0015] Further: the pulley hanging rail includes a belt and a track; the lifting head is set on the track through four rotating track wheels, and one end is connected to the belt, the lifting heads are evenly spaced on the pulley hanging rail, and the lifting heads are equipped with a posture fine-tuning structure, which is used to adjust the posture of the lifting head.

[0016] Further: the posture fine-tuning structure includes a positioning plate arranged on one side of the lifting head, a positioning groove is provided on the side of the positioning plate, and the groove surface of the positioning groove is a semicircular arc surface; a rotating rod is provided on the pulley hanging rail, and a number of mounting arms with the same number as the lifting heads are arranged at intervals on the rotating rod, and a positioning ring matching the positioning groove is rotatably provided on the end of the mounting arm, and the mounting arm is fixed on the rotating rod.

[0017] Furthermore: the mounting arm is driven by a pushing device, the pushing device includes a mounting seat arranged at the upper end of the pulley hanging rail, a hinged plate is provided at the upper end of the mounting seat, a cylinder is rotatably connected between the hinged plates through a rotating shaft, the end of the cylinder is rotatably connected to an adjusting arm, and one end of the adjusting arm is fixed on the rotating rod.

[0018] Furthermore: a gas escape capture device is provided in the paint spraying room, and the gas escape capture device includes an inlet and outlet capture structure and an in-room capture structure; the in-room capture structure includes a support bar arranged at the bottom of the paint spraying room, and a first ventilation slot plate is provided on the support bar, and a first exhaust pipe is connected to the bottom of the paint spraying room;

[0019] The entrance and exit capture structure includes a threshold provided at the bottom of the paint spraying room, a capture groove is provided in the threshold, a second exhaust pipe is provided at the bottom of the capture groove, and a second ventilation slot plate is provided at the slot position;

[0020] The first exhaust pipe and the second exhaust pipe are buried underground and connected to an underground connecting pipe, and one end of the connecting pipe is connected to an exhaust fan.

[0021] Further: the entrance and exit capture structure also includes a side suction component, the side suction component includes an inclined surface arranged at the entrance and exit of the paint spray room, a third ventilation slot plate is arranged on the inclined surface, the third ventilation slot plate is connected to a vertical exhaust slot, and the vertical exhaust slot is connected to the capture slot through a connecting slot.

[0022] Furthermore: the sizes of the ventilation slots in the first ventilation slot plate, the third ventilation slot plate, and the second ventilation slot plate gradually decrease.

[0023] The beneficial effects are:

[0024] 1. Efficient sealing to prevent paint mist leakage: The paint retaining structure uses a dynamic sealing design of the mounting frame, lifting frame and folding plate to effectively prevent the paint mist in the spray booth from leaking into the external environment through the side wall groove.

[0025] 2. The rigid-flexible combination of the flexible material (bending plate) of the folding plate and the stainless steel components (connector and baffle) ensures the high sealing and durability of the entire folding plate. At the same time, the telescopic characteristics of the folding plate allow the catheter to rise and fall smoothly in the side wall groove, compatible with the dynamic adjustment requirements of the nozzle, avoiding the restrictions of traditional fixed seals on lifting and lowering movements, and improving the flexibility of spraying operations.

[0026] 3. Precise posture correction: The posture fine-tuning structure can correct the position change of the lifting head caused by belt tensioning through the precise coordination of the rotating rod, mounting arm and positioning ring with the positioning groove, ensuring that the metal plate enters the paint spraying room with the correct posture and ensuring the uniformity and quality of the paint spraying.

[0027] 4. Dynamic adjustment of the positioning ring: The swing of the mounting arm can provide a small thrust while rotating in the positioning groove through the positioning ring, slightly changing the force state of the lifting head on the belt; the adjustment is more accurate and smooth.

[0028] 5. Efficient capture of paint mist and VOCs: The gas escape capture device utilizes a multi-point layout of capture structures within the room and at the entrance and exit points, achieving an overall capture efficiency of over 99%. The first ventilation slots within the room efficiently collect high-concentration gases, while the entrance and exit capture slots and side suction components precisely capture low-concentration escaped gases, fully covering the escape path of the paint spray booth.

[0029] 6. Optimizing Exhaust Efficiency: The ventilation slots of the first, third, and second ventilation slots are designed with decreasing sizes to create a gradient of extraction efficiency, adapting to the gas concentration distribution in different areas. Larger ventilation slots are suitable for high-flow extraction within the room, while smaller ventilation slots increase the extraction speed at the entrance and exit, optimizing energy consumption and capture efficiency, while also adjusting the entry posture of lighter metal panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and accompanying drawings.

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 for Figure 1 Middle partial enlarged view;

[0033] Figure 3 A top view of the present invention;

[0034] Figure 4 It is the front view of the present invention;

[0035] Figure 5 It is a parts diagram of the feeding device of the present invention;

[0036] Figure 6 for Figure 5 Middle partial enlarged view;

[0037] Figure 7 It is a parts diagram of the lifting device of the present invention;

[0038] Figure 8 for Figure 7 Middle partial enlarged view;

[0039] Figure 9 This is a drawing of the paint blocking structure parts of the present invention;

[0040] Figure 10 for Figure 9 Middle partial enlarged view;

[0041] Figure 11 This is a cross-sectional view of the paint blocking structure of the present invention;

[0042] Figure 12 for Figure 11 Enlarged view of point A in the middle;

[0043] Figure 13 for Figure 11 Enlarged view of point B in the middle;

[0044] Figure 14 It is a schematic diagram of the limit formation after the folding plate rises in the present invention;

[0045] Figure 15 for Figure 11 Enlarged view of point C in the middle;

[0046] Figure 16 for Figure 11 Enlarged view of point D in the middle;

[0047] Figure 17 for Figure 16 Middle partial enlarged view;

[0048] Figure 18 This is a parts diagram of the paint spray booth of the present invention;

[0049] Figure 19 This is a partial cross-sectional view of the paint spraying room of the present invention;

[0050] Figure 20 For the present invention Figure 19 Middle partial enlarged view;

[0051] Figure 21 This is a diagram of the ventilation slot plate parts of the present invention;

[0052] Figure 22 for Figure 21 A partial enlarged view.

[0053] Description of reference numerals:

[0054] 1. Paint spray booth; 2. Feeding device; 21. Pulley hanging rail; 211. Belt; 212. Track; 213. Track wheel; 22. Lifting head; 23. Attitude fine-tuning structure; 231. Positioning plate; 232. Positioning slot; 233. Rotating rod; 234. Mounting arm; 235. Positioning ring; 24. Pushing device; 241. Mounting seat; 242. Hinge plate; 243. Cylinder; 244. Adjusting arm; 3. Spray nozzle; 4. Lifting device; 5. Conduit; 6. Side wall groove; 7. Paint blocking structure; 71. Mounting frame; 72. Lifting frame; 73. Folding plate; 731. Connector; 732. Bending plate 733. Baffle; 8. Limiting device; 81. Movable plate; 82. Limiting plate; 83. Limiting frame; 84. Mounting plate; 85. Through slot; 9. Adjusting device; 91. Adjusting slot; 92. Holding bolt; 10. Entrance and exit capture structure; 101. Door sill; 102. Capturing slot; 103. Second exhaust pipe; 104. Second ventilation slot plate; 11. In-room capture structure; 111. Support bar; 112. First ventilation slot plate; 113. First exhaust pipe; 12. Connecting pipe; 13. Side suction assembly; 131. Inclined surface; 132. Third ventilation slot plate; 133. Vertical exhaust slot; 134. Connecting slot. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0056] It should be noted that, in the description of the present invention, unless otherwise specified, “multiple” means two or more; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front end”, “rear end”, “head”, “tail”, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0058] Furthermore, in the description of the present invention, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0059] See Figure 1-22 This is an embodiment of an automatic spraying device for metal sheet products of the present invention;

[0060] like Figure 1 、 Figure 18 、 Figure 7 As shown, the paint spraying equipment of the present invention includes a paint spraying room 1, a feeding device 2 and a nozzle 3 arranged in the paint spraying room 1. The nozzle 3 can be moved up and down in the paint spraying room 1 through a lifting device 4 to achieve precise spraying of the workpiece. The lifting device 4 is arranged outside the paint spraying room 1 and extends into the paint spraying room 1 through a conduit 5 to be connected to the nozzle 3. The conduit 5 is externally connected to the paint spraying equipment to supply paint. The side wall of the paint spraying room 1 is provided with a side wall groove 6 for the conduit 5 to extend into and provide a lifting space. A paint blocking structure 7 is provided in the side wall groove 6 to prevent paint mist from leaking from the side wall groove 6. In addition, the feeding device 2 is used to feed the workpiece into the paint spraying room 1 and adjust the posture of the workpiece. A gas escape capture device is also provided in the paint spraying room 1 to capture paint mist and volatile gases generated during the painting process.

[0061] See Figure 7 As shown, the nozzle lifting mechanism:

[0062] Lifting device 4, a conventional technology, moves spray head 3 up and down within spray booth 1 via conduit 5. Conduit 5 extends into booth 1 through sidewall slot 6, a vertical, long slot running through the sidewall of booth 1. A paint retaining structure 7 is located within sidewall slot 6 to prevent paint mist from leaking through it.

[0063] See Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown, the paint blocking structure 7:

[0064] The paint blocking structure 7 is a key component in the paint spraying equipment, which is mainly used to prevent the paint mist generated during the spraying process in the paint spraying room 1 from leaking to the external environment through the side wall groove 6, while ensuring that the conduit 5 can be smoothly raised and lowered in the side wall groove 6.

[0065] The working principle of the paint blocking structure 7 is based on a design of dynamic sealing and flexible shielding. The side wall groove 6 is an opening on the side wall of the paint spray booth 1 that provides a lifting space for the conduit 5. The paint mist inside the paint spray booth 1 can escape through this opening. The paint blocking structure 7 is provided by providing a mounting frame 71 that fits the side wall groove 6, and a lifting frame 72 that can be raised and lowered with the conduit 5 is arranged within the frame. The folding plates 73 at the upper and lower ends of the lifting frame 72 form a dynamic sealing barrier. The folding plates 73 can expand or contract as the lifting frame 72 moves up and down, always covering the opening area of the side wall groove 6, thereby effectively preventing the leakage of paint mist while not hindering the lifting movement of the conduit 5.

[0066] The paint retaining structure 7 includes a mounting frame 71: the mounting frame 71 is a rectangular frame, sized to match the sidewall groove 6, and made of a corrosion-resistant material (such as stainless steel or coated steel) to resist chemical attack by the paint in the spray booth 1. The mounting frame 71 is fixed to the groove surface of the sidewall groove 6 by bolts or welding.

[0067] Lifting frame 72: This is a small rectangular frame, consisting of an upper plate, a lower plate, and a clamping plate between them, forming an "I" shape. The clamping plates are fitted with rubber sleeves that secure the guide tube 5. The upper and lower ends of lifting frame 72 are connected to folding plates 73, and the sides are connected to movable plates 81 of the limiter 8 to limit its range of movement.

[0068] Folding plate 73: acts as a dynamic sealing element, covering the gap between the lifting frame 72 and the installation frame 71 to prevent paint mist leakage; the folding plate 73 is composed of a connecting head 731, a bending plate 732 and a baffle 733.

[0069] See Figure 16 、 Figure 17 As shown, the connector 731 is made of stainless steel. The connector 731 at the outermost edge is fixed to the upper and lower ends of the lifting frame 72, playing a connecting and supporting role. The bending plate 732 is made of a flexible deformable material (such as corrosion-resistant rubber, silicone or polymer composite material) with good elasticity and chemical resistance. The baffle 733 is connected to one end of the bending plate 732 and is made of stainless steel to enhance sealing and structural strength. The two ends of the bending plate 732 are respectively connected to the baffle 733 and the connector 731 by gluing. When the entire lifting frame 72 moves, it will drive the entire folding plate 73 to move up and down. At this time, the bending plate 732 is deformed by force, driving the baffle 733 to tilt, so that the baffle 733 changes from a nearly horizontal state to a nearly vertical state.

[0070] The inclination angle of the baffle 733 in this device is determined by the performance of the bending plate 732. The stronger the bending ability of the bending plate 732, the greater the inclination angle of the baffle 733. This device adopts a compromise solution to reduce the material requirements for the bending plate 732, so that the baffle 733 can be tilted at a maximum of forty-five degrees, but more baffles 733 must be set accordingly.

[0071] Specific use: When the lifting frame 72 rises, the upper folding plate 73 is compressed and the lower folding plate 73 is extended; similarly, when the lifting frame 72 descends, the lower folding plate 73 is compressed and the upper folding plate 73 is extended.

[0072] The modular design of the paint retaining structure 7 (mounting frame 71, lifting frame 72, and folding plate 73) facilitates disassembly and maintenance. If excessive paint accumulates on the surface of the folding plate 73 due to long-term use, the two parts of the folding plate 73 can be disassembled and soaked in a fat-soluble detergent for cleaning. After cleaning, the folding plate 73 can be reassembled and reused.

[0073] If the bending plate 732 becomes aged after repeated cleaning, the aged portion can be replaced without replacing the baffle 733 and the connector 731 .

[0074] Limit device:

[0075] The limiting device 8 is provided in the paint spraying equipment of the present invention primarily to address the problem of paint adhering to the outer surface of the folding plate 73 (particularly the baffle 733) during the painting process. In the paint spray booth 1, the paint mist generated by the nozzle 3 during spraying will inevitably adhere to the outer surface of the folding plate 73, particularly the baffle 733. Over time, a thicker layer of paint may form on the outer surface of the baffle 733, significantly increasing its thickness and weight. This increased thickness prevents the baffle 733 from being fully compressed as in its initial state during the expansion and contraction of the folding plate 73, reducing the thoroughness of the folding. This limits the deformation range of the folding plate 73 and affects the smooth movement of the lifting frame 72. At the same time, the viscosity of the paint may cause adjacent folded areas of the folding plate 73 to stick together during compression. Once stuck together, the extension and compression of the folding plate 73 are hindered, increasing the resistance to movement of the lifting frame 72 and even causing the folding plate 73 to tear or permanently deform.

[0076] This adhesion phenomenon is particularly serious during the dynamic process of the folding plate 73 frequently extending and retracting, which may further aggravate the degradation of the sealing performance and increase the risk of paint mist leakage.

[0077] Limiting device 8 effectively addresses this issue by precisely controlling the range of movement of lifting frame 72 and guide tube 5. Specifically, it functions as follows: By physically limiting the movement of movable plate 81 and limiting plate 82, limiting the vertical movement of lifting frame 72 (for example, to a range of tens of centimeters to several meters, depending on the workpiece height). This prevents folding plate 73 from being stretched or compressed to its limit due to excessive movement of lifting frame 72, thus reducing the impact of paint accumulation on folding performance.

[0078] For example, when the movable plate 81 contacts the upper limit plate 82, the lifting frame 72 stops rising to prevent the folding plate 73 (especially the lower bending plate 732) from being over-stretched; conversely, when it contacts the lower limit plate 82, it prevents excessive compression and reduces the extrusion and adhesion of the baffle 733.

[0079] At the same time, the range of the up and down movement of the lifting frame 72 can also be flexibly adjusted:

[0080] The limiting device 8 cooperates with the adjusting device 9 (adjusting slot 91 and clamping bolt 92). By rotating the clamping bolt 92, the limiting plate 82 can be released. Then the staff can operate the clamping bolt 92 to drive the limiting plate 82 to rise and fall in the adjusting slot 91. After adjusting to the appropriate position, rotate the clamping bolt 92 to fix the position of the limiting plate 82.

[0081] Such setting allows the position of the limit plate 82 to be flexibly adjusted according to the paint accumulation situation or workpiece height requirement of the folding plate 73. This ensures that the limit range adapts to the actual state of the folding plate 73, taking into account both protection function and spraying flexibility.

[0082] See Figure 2-6 As shown, the feeding device:

[0083] The feeding device 2 includes a pulley hanging rail 21 and a hanging head 22 slidably arranged on the pulley hanging rail 21 .

[0084] The pulley hanging rail 21 used in this device is an existing technology in the field. The pulley hanging rail 21 includes a belt 211 and a track 212. The lifting head 22 is set on the track 212 through four rotating track wheels 213, and one end is connected to the belt 211. The principle is that the rotating belt 211 drives the lifting head 22 connected to the belt 211 to move, and the lifting head 22 moves under the condition of a limited guide rail. The lifting heads 22 are evenly spaced along the pulley hanging rail 21, and are used to lift workpieces and send them into the paint spraying room 1.

[0085] At present, this feeding device 2 needs to install the lifting head 22 on the flexible belt 211. After long-term use, the belt 211 will become loose, and a tensioning device is generally used to tension the belt 211; but the tensioned belt 211 will cause the angle of the lifting head 22 to be slightly tilted, or the distance between two adjacent lifting heads 22 to change slightly; the slight tilt of the angle of the lifting head 22 will cause the hoisted metal plate to enter the paint spraying room 1 not in the required posture, which will affect the subsequent painting process; and the change in the distance between the lifting heads 22 will cause the distance between two adjacent metal plates to be different. When the paint spraying room 1 is automatically spraying, there will be problems with the spraying time connection, resulting in insufficient or excessive paint spraying on the metal plates.

[0086] To prevent this from happening, the device is equipped with a posture fine-tuning structure 23. This structure includes a positioning plate 231 positioned on one side of the lifting head 22. A positioning groove 232 is provided on the side of the positioning plate 231. The groove surface of the positioning groove 232 is a semicircular arc surface. A rotating rod 233 is provided on the pulley hanging rail 21. A number of mounting arms 234 are spaced apart on the rotating rod 233, the same number as the number of lifting heads 22. A positioning ring 235 is rotatably provided at the end of the mounting arm 234, which matches the positioning groove 232. The mounting arm 234 is fixed to the rotating rod 233. The positioning ring 235 cooperates with the semicircular arc surface of the positioning groove 232 to achieve fine-tuning rotation of the lifting head 22.

[0087] See Figure 2 As shown, the working principle of the posture fine-tuning structure 23 is:

[0088] After the belt 211 is tensioned, the length of the belt 211 will change. Since the lifting head 22 is fixed on the belt 211 of the pulley hanging rail 21, the position of the lifting head 22 will change slightly. At this time, the rotating rod 233 will rotate, and the rotating rod 233 will drive the installation arm 234 to rotate, and the installation arm 234 will drive the positioning ring 235 to move to the positioning plate 231 with the positioning groove 232; the positioning ring 235 is used to reset the entire lifting head 22.

[0089] The positioning groove 232 in this device is in the shape of a semicircular arc surface, and the positioning ring 235 is rotatably set at the end of the mounting arm 234; the change in the spacing between adjacent lifting heads 22 is mainly due to the local extension or compression after the belt 211 is tensioned. The posture fine-tuning structure 23 synchronously adjusts the position of all the mounting arms 234 through the overall rotation of the rotating rod 233, thereby indirectly affecting the relative position of the lifting head 22 on the belt 211. Specifically, the swing of the mounting arm 234 can slightly change the stress state of the lifting head 22 on the belt 211 through the slight thrust of the positioning ring 235 on the positioning groove 232, prompting the belt 211 to redistribute the tension under tension and restore the uniform spacing of the lifting heads 22 as much as possible. Although this process is limited by the flexibility of the belt 211 and the fine-tuning amplitude is small, it is sufficient to compensate for the spacing deviation at the millimeter level and meet the connection requirements of the painting process.

[0090] The deviation of the lifting head 22 can be detected by a sensor (such as an angle sensor) or manually. When too many deviations of the lifting head 22 are detected, the posture fine-tuning structure 23 of the device can be activated to fine-tune the lifting head 22.

[0091] See Figure 2 As shown, automatic fine-tuning:

[0092] This device features a propulsion mechanism 24, the core driving component of the fine-tuning mechanism 23 within the paint spraying equipment's feeder 2. This mechanism provides rotational force to the rotating rod 233, which in turn adjusts the posture and spacing of the lifting head 22 via the mounting arm 234 and positioning ring 235 to compensate for deviations caused by belt 211 tensioning. This mechanism operates based on a combination of pneumatic and mechanical drive. By precisely controlling the telescopic movement of the cylinder 243, the rotating rod 233 rotates, thereby achieving fine-tuning of the lifting head 22. The operating principle of the propulsion mechanism 24 is detailed below.

[0093] The propulsion device 24 includes the following main components: a mounting base 241, a hinge plate 242, a cylinder 243, and an adjustment arm 244. The working principle is that the cylinder 243's telescopic action drives the adjustment arm 244 to swing, which in turn drives the rotating rod 233 to rotate, providing power for the posture fine-tuning structure 23. The specific working process is as follows:

[0094] When the pulley hanging rail 21 is operating normally or in the initial state after the belt 211 is tensioned, the cylinder 243 is in the neutral or initial position. The adjustment arm 244 is fixedly connected to the rotating rod 233, the rotating rod 233 remains stationary, and the installation arm 234 and the positioning ring 235 do not apply any adjustment force to the hanging head 22.

[0095] When the cylinder 243 is activated, it pulls the adjustment arm 244. Since the other end of the adjustment arm 244 is fixed to the rotating rod 233, the linear motion of the cylinder 243 is converted into rotational motion of the rotating rod 233 through the adjustment arm 244. When the piston rod of the cylinder 243 is extended, the adjustment arm 244 is pushed upward, causing the rotating rod 233 to rotate clockwise. When the piston rod of the cylinder 243 is retracted, the adjustment arm 244 is pulled downward, causing the rotating rod 233 to rotate counterclockwise. The rotation of the rotating rod 233 causes the mounting arm 234 fixed to it to swing synchronously. The positioning ring 235 at the end of the mounting arm 234 slides within the positioning groove 232 of the positioning plate 231 on the lifting head 22, guiding the lifting head 22 to rotate slightly.

[0096] See Figure 18 、 Figure 22 As shown, the gas escape capture device:

[0097] A gas capture device is an environmentally friendly structure used within paint spraying equipment to capture paint mist and volatile organic compounds (VOCs) generated during the painting process. It aims to reduce the escape of these harmful substances into the external environment, comply with strict environmental regulations, and protect the health of operators. Using a multi-stage ventilation and exhaust system, the device efficiently collects escaped gases from within the paint booth 1 and at its entrance and exit areas, transporting them to subsequent treatment equipment. This brief will detail the design and operation of the gas capture device from four perspectives: structural composition, operating principle, functional features, and practical results.

[0098] The gas escape capture device consists of two main subsystems: the in-room capture structure 11 and the inlet and outlet capture structure 10, which work in conjunction with the exhaust fan through the underground connecting pipe 12. The following is a detailed structural description of each part:

[0099] In-room capture structure 11:

[0100] Support bars 111 are located at the bottom of the spray booth 1 and are made of corrosion-resistant material (such as stainless steel or coated steel). They form the framework of the bottom ventilation system. Support bars 111 are evenly distributed according to the size of the spray booth 1. This spray booth 1 utilizes cross-shaped support bars 111 to create a stable support platform.

[0101] First ventilation slot plate 112: Installed on support bar 111, covering the bottom area of spray booth 1. The first ventilation slot plate 112 is provided with multiple larger ventilation slots (relative to the inlet and outlet capture structures), allowing paint mist and gas to be drawn downwards through negative pressure.

[0102] The first exhaust pipe 113 is connected to the bottom of the paint spraying room 1 and is connected to the space below the first ventilation slot plate 112. The first exhaust pipe 113 is buried underground and extracts gas through the negative pressure of the exhaust fan.

[0103] Entrance and exit capture structure 10:

[0104] It includes a threshold 101: it is set at the bottom of the entrance and exit of the paint spraying room 1, made of concrete, and has a capture groove 102 inside.

[0105] Capture groove 102: Located inside threshold 101, it is a rectangular groove extending along the width of threshold 101. The bottom of the groove is connected to the second exhaust pipe 103, and the groove opening is covered by the second ventilation slot plate 104. Capture groove 102 is used to collect escaping gas in the entrance and exit areas.

[0106] The second ventilation slot plate 104 covers the slot opening of the capture slot 102 . The size of the ventilation slot is smaller than that of the first ventilation slot plate 112 . The slot holes are designed to be denser to improve the air extraction efficiency in the inlet and outlet areas.

[0107] The second exhaust pipe 103 is connected to the bottom of the capture tank 102 , buried underground, and communicated with the connecting pipe 12 , and is used to extract the gas in the capture tank 102 .

[0108] Side suction component 13:

[0109] It includes an inclined surface 131: arranged on the side wall of the entrance and exit of the paint spraying room 1, forming an inclined air suction surface to facilitate capturing the gas escaping from the side of the entrance and exit.

[0110] The third ventilation slot plate 132 is installed on the inclined surface 131. The ventilation slot size of the third ventilation slot plate 132 is larger than the ventilation slot size of the second ventilation slot plate 104 and smaller than the size of the first ventilation slot plate 112. It further improves the exhaust efficiency and targets the trace gas that escapes laterally from the inlet and outlet.

[0111] Vertical exhaust slots 133 : connected to the third ventilation slot plate 132 , arranged vertically along the sidewalls of the inlet and outlet, connected to the capture slot 102 through the connecting slot 134 , and guide the lateral gas to the second exhaust pipe 103 .

[0112] First, the third ventilation slots 132 and second ventilation slots 104 in the present device can extract escaping gas from the paint spray booth 1 under the action of airflow, preventing the gas from diffusing outside the paint spray booth 1. Secondly, when metal plates enter the paint spray booth 1 from the entrance, the airflow from the third ventilation slots 132 will cause the metal plates to deflect in the direction of the airflow. At this time, the metal plates will experience slight swaying under the influence of the airflow on both sides (the specific situation depends on the magnitude of the airflow, the size of the metal plates, and the gravity. Only very small and light metal plates will experience this). To prevent this from happening, the second ventilation slots 104 of the present device use the vertical downward airflow from the second ventilation slots 104 to guide the tilted metal plates back into place. At the same time, to prevent the airflow generated by the second ventilation slots 104 from affecting the airflow of the third ventilation slots 132, the present device reduces the size of the ventilation slots in the second ventilation slots 104 to be smaller than the size of the ventilation slots in the third ventilation slots 132. In this way, under certain wind conditions, the smaller the area, the faster the airflow rate.

[0113] The connecting pipe 12 in this device is buried underground, connecting the first exhaust pipe 113 and the second exhaust pipe 103 to form a unified exhaust channel. The connecting pipe 12 is made of corrosion-resistant pipe (such as PVC or stainless steel) to ensure long-term sealing and stability.

[0114] The exhaust fan is connected to one end of the connecting pipe 12 to provide a strong negative pressure, driving the gas to be sucked in from the first ventilation slot plate 112, the second ventilation slot plate 104 and the third ventilation slot plate 132, and finally sent to subsequent processing equipment (such as an activated carbon adsorption device or an incinerator).

[0115] The working principle of the gas escape capture device is based on the design of negative pressure extraction and multi-stage filtration. Through multiple capture points inside the room and at the entrances and exits, it comprehensively collects the paint mist and volatile gases generated during the painting process. The specific working process is as follows:

[0116] The first ventilation slot plate 112 is the main gas capture structure:

[0117] Inside the paint booth 1, the spray nozzles 3 generate a large amount of paint mist and VOCs when spraying. These gases are suspended or settled in the environment of the paint booth 1. The exhaust fan generates negative pressure at the bottom of the paint booth 1 through the connecting pipe 12 and the first exhaust pipe 113. The larger ventilation slots in the first ventilation slot plate 112 allow the paint mist and gases to be drawn into the space below the support bar 111 through the negative pressure and then enter the first exhaust pipe 113. The large ventilation slot design is suitable for capturing the high concentration of gases inside the paint booth 1, ensuring efficient extraction.

[0118] The in-room capture structure 11 in this device can control the direction of the airflow, thereby indirectly controlling the trajectory of the paint particles, so that all paint particles move downward after being sprayed. For the spray head 3, the majority of the sprayed paint particles will adhere to the surface of the metal plate, and only a small portion will diffuse from the surrounding areas (top, bottom, left, and right) of the metal plate. The in-room capture structure 11 can guide these paint particles to move downward, reducing the range of paint particles that diffuse around the metal plate.

[0119] See Figure 18 、 19 The first exhaust pipe 113 in this device is a trumpet-shaped pipe with a large diameter opening facing upward. When exhaust begins, the airflow in the paint spray booth 1 converges toward the first exhaust pipe 113. At this time, the airflow is distributed from all sides of the paint spray booth 1 to the center of the first exhaust pipe 113. This is different from the case where the first exhaust pipe 113 is a straight pipe, in which most of the airflow is vertical.

[0120] At this time, the paint particles moving downward near the metal plate overlap and converge toward the center. While moving downward, they will touch the metal plate and adhere to the metal plate, increasing the effect of the spray paint.

[0121] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An automatic spraying device for metal sheet products, characterized in that: It comprises a paint spraying room (1), a feeding device (2) and a spray head (3) arranged in the paint spraying room (1), wherein the spray head (3) can be moved up and down in the paint spraying room (1) via a lifting device (4), wherein the lifting device (4) is arranged outside the paint spraying room (1) and extends into the paint spraying room (1) via a conduit (5) and is connected to the spray head (3), wherein the conduit (5) is externally connected to a paint spraying device; The side wall of the paint spraying room (1) is provided with a side wall groove (6) for the conduit (5) to extend into and provide a lifting space, and a paint blocking structure (7) is provided in the side wall groove (6); the paint blocking structure (7) includes a mounting frame (71) that is in contact with the groove surface of the side wall groove (6), and a lifting frame (72) for mounting the conduit (5) and allowing the conduit (5) to extend into the paint spraying room (1) is provided in the mounting frame (71), and folding plates (73) are provided at the upper and lower ends of the lifting frame (72), and the other end of the folding plate (73) is connected to the upper and lower frame walls of the mounting frame (71); The feeding device (2) comprises a pulley hanging rail (21) and a lifting head (22) slidably arranged on the pulley hanging rail (21), the lifting heads (22) are evenly spaced on the pulley hanging rail (21), and the lifting heads (22) are equipped with a posture fine-tuning structure (23), the posture fine-tuning structure (23) is used to adjust the posture of the lifting head (22); the posture fine-tuning structure (23) comprises a positioning plate (231) arranged on one side of the lifting head (22), the side of the positioning plate (231) is provided with a positioning groove (232), the groove surface of the positioning groove (232) is a semicircular arc surface; a rotating rod (233) is provided on the pulley hanging rail (21), the rotating rod (233) is spaced apart with a number of mounting arms (234) the same number as the number of the lifting heads (22), and the end of the mounting arm (234) is rotatably provided with a positioning ring (235) matching the positioning groove (232).

2. The automatic spraying device for metal sheet products according to claim 1, characterized in that: The folding plate (73) comprises a connecting head (731), a bending plate (732) connected to the connecting head (731), and a baffle (733) arranged between the bending plates (732).

3. The automatic spraying device for metal sheet products according to claim 2, characterized in that: The installation frame (71) is provided with a limiting device (8) for limiting the lifting range of the conduit (5); the limiting device (8) comprises a movable plate (81) located on the side of the lifting frame (72) and limiting plates (82) provided on the installation frame (71) and located above and below the lifting frame (72).

4. The automatic spraying device for metal sheet products according to claim 3, characterized in that: The limiting device (8) also includes a lifting space arranged on the installation frame (71) for enabling the movable plate (81) to be lifted and lowered, and the lifting space is formed by the inner wall of a limiting frame (83) arranged on the side of the installation frame (71); a mounting plate (84) is provided on the side of the vertical frame of the installation frame (71), the limiting frame (83) is fixed to the side of the mounting plate (84), and a through groove (85) is provided on the mounting plate (84), one side of the limiting frame (83) is open and communicated with the through groove (85), and the movable plate (81) extends into the limiting frame (83) through the through groove (85).

5. The automatic spraying device for metal sheet products according to claim 4, characterized in that: An adjusting device (9) for adjusting the upper and lower positions of the limiting plate (82) is provided on the side of the mounting plate (84); the adjusting device (9) comprises an adjusting slot (91) penetrating the limiting frame (83) and a clamping bolt (92) threadedly connected to the limiting plate (82); the limiting plate (82) is arranged in the limiting frame (83), and the clamping bolt (92) penetrates the adjusting slot (91) and is threadedly connected to the limiting plate (82).

6. The automatic spraying device for metal sheet products according to claim 5, characterized in that: The paint spraying room (1) is provided with a gas escape capture device, and the gas escape capture device includes an inlet and outlet capture structure (10) and an in-room capture structure (11); the in-room capture structure (11) includes a support bar (111) arranged at the bottom of the paint spraying room (1), a first ventilation slot plate (112) is provided on the support bar (111), and a first exhaust pipe (113) is connected to the bottom of the paint spraying room (1); the inlet and outlet capture structure (10) includes a threshold (101) provided at the bottom of the paint spraying room (1), a capture slot (102) is provided in the threshold (101), a second exhaust pipe (103) is provided at the bottom position of the capture slot (102), and a second ventilation slot plate (104) is provided at the slot position; the first exhaust pipe (113) and the second exhaust pipe (103) are buried underground and connected to an underground connecting pipe (12), and a section of the connecting pipe (12) is connected to an exhaust fan.

7. The automatic spraying device for metal sheet products according to claim 6, characterized in that: The inlet and outlet capture structure (10) further comprises a side suction assembly (13), the side suction assembly (13) comprising an inclined surface (131) provided at the inlet and outlet of the paint spraying room (1), a third ventilation slot plate (132) provided on the inclined surface (131), the third ventilation slot plate (132) being connected to a vertical exhaust slot (133), the vertical exhaust slot (133) being connected to the capture slot (102) via a connecting slot (134).

8. The automatic spraying device for metal sheet products according to claim 7, characterized in that: The sizes of the ventilation slots in the first ventilation slot plate (112), the third ventilation slot plate (132), and the second ventilation slot plate (104) gradually decrease.

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