Intelligent spraying equipment of steel pretreatment line

Abstract

The invention relates to the technical field of steel plate spraying treatment, in particular to intelligent spraying equipment of a steel pretreatment line. Paint flying around can be reduced, it is guaranteed that the site construction environment is clean, paint waste is reduced, and the paint spraying device is more environmentally friendly. Comprising a feeding roller way and a paint spraying room, and the feeding roller way is used for conveying steel plates into the paint spraying room; the paint spraying trolley is installed in the paint spraying room in a sliding mode, the transverse movement driver provides power for sliding of the paint spraying trolley, and the paint spraying mechanism is installed on the paint spraying trolley. The paint spraying mechanism comprises an outer barrel, an inner barrel fixedly mounted in the outer barrel, a mounting shell fixedly mounted in the inner barrel, a double-shaft-head motor fixedly mounted in the mounting shell, a flow guide cover mounted at the flow outlet end of the outer barrel, a plurality of backflow pipes and a collecting cover, and a hollow shaft is rotationally mounted on the double-shaft-head motor. One end of the hollow shaft is fixedly provided with a pitched blade turbine, and the other end of the hollow shaft is provided with a nozzle.

Description

Technical Field

[0001] This invention relates to the technical field of steel plate spraying treatment, and in particular to an intelligent spraying equipment for a steel pretreatment line. Background Technology

[0002] The main component of steel plates is iron, which readily reacts with oxygen in humid environments to form rust. Rust greatly weakens the strength, hardness, and service life of steel plates. However, the coating on the surface of steel plates can form a dense and continuous protective film, physically isolating the steel plates from contact with external moisture, oxygen, and corrosive chemicals, thereby fundamentally preventing or significantly delaying the occurrence of rust. Therefore, anti-corrosion spraying treatment is necessary during the pretreatment of steel plates.

[0003] For example, the utility model patent application with publication number CN214390763U discloses a steel plate longitudinal spraying production line, which includes spraying equipment, steel plate clamping device, spraying room, and dust removal equipment including washing tower, induced draft fan, dust removal pipeline, dust removal hood and cover net. The air inlet of the dust removal hood is connected to the inside of the spraying room, which enables the steel plate to be erected and conveyed vertically for spraying. It has good dust removal effect, no explosion risk, and high working efficiency.

[0004] However, during the longitudinal spraying process of steel plates, under the action of gravity, some paint falls to the ground, while some paint spreads in all directions. This not only wastes paint but also creates a poor on-site construction environment and increases the processing burden on subsequent dust removal equipment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an intelligent spraying equipment for steel pretreatment lines that reduces paint scattering, ensures a clean on-site construction environment, reduces paint waste, and is more environmentally friendly.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intelligent spraying equipment for a steel pretreatment line, comprising a feeding roller conveyor and a spray booth, wherein the feeding roller conveyor is used for conveying steel plates into the spray booth; further comprising a spraying trolley slidably installed in the spray booth, a transverse drive that provides power for the sliding of the spraying trolley, a paint pump, a paint supply pipeline, and a spraying mechanism installed on the spraying trolley, wherein the spraying mechanism comprises an outer cylinder, an inner cylinder fixedly installed in the outer cylinder, a mounting housing fixedly installed in the inner cylinder, and a dual-shaft head motor fixedly installed in the mounting housing. The system includes a motor, a flow guide shroud installed at the outlet end of the outer cylinder, multiple return pipes, and a collection shroud. A hollow shaft is rotatably mounted on the dual-shaft motor. A slanted blade turbine is fixedly mounted at one end of the hollow shaft, and a nozzle is mounted at the other end of the hollow shaft. The hollow shaft has a hollow cavity that communicates with the nozzle input end. One end of the paint supply pipe is connected to the output end of the paint pump, and the other end of the paint supply pipe is rotatably and sealed to the hollow shaft. The collection shroud is located at the edge of the outlet port of the flow guide shroud. One end of the return pipe penetrates the outer cylinder and extends into the inner cylinder.

[0007] Furthermore, the transverse drive is preferably a mechanical slide, but other drives that can move the paint spraying carriage can also be used. The mechanical slide is equipped with an organ cover and a Siemens servo motor to drive the paint spraying carriage.

[0008] The central axes of the outer cylinder, inner cylinder, dual-axis motor, and flow guide are coincident.

[0009] The air guide can be a cylindrical or conical shroud; an annular air intake channel is formed between the mounting housing and the inner cylinder; the inclined blade turbine is installed at the junction of the inner cylinder and the mounting housing; the inclined blade turbine is used to pressurize the airflow in the inner cylinder to form a swirling flow; the paint supply pipeline is connected to the hollow shaft through a rotary sealing joint; the input end of the paint pump extends into the external paint supply cylinder.

[0010] Multiple return pipes are evenly distributed around the circumference of the collection cover; the outer cylinder is provided with a mounting flange, which is fixedly connected to the painting trolley by bolts.

[0011] The paint supply pipeline is made of flexible plastic pipe. A hanging beam is fixedly installed inside the spray booth. Multiple sets of hooks are slidably installed on the hanging beam, and the paint supply pipeline is fixedly installed on each hook.

[0012] Preferably, the flow guide includes multiple flow guide plates hinged to the outlet end of the inner cylinder, a drive ring frame rotatably mounted on the outside of the outer cylinder, and a rotary drive component that provides power for the rotation of the drive ring frame. The flow guide plates are provided with drive handles, and the drive ring frame is provided with multiple inclined sliding grooves that are inclined along the axial direction of the drive ring frame. The drive handles extend into the corresponding inclined sliding grooves.

[0013] Furthermore, the rotary drive component is preferably a telescopic cylinder, which can be an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder. One end of the telescopic cylinder is hinged to the outer wall of the inner cylinder, and the other end of the telescopic cylinder is hinged to the drive ring frame.

[0014] The rotary drive can also be a brake motor and a drive wheel, with the drive wheel fixedly mounted on the output end of the brake motor and the drive wheel connected to the drive ring frame via a transmission; the rotary drive can also be other equivalent components that drive the drive ring frame to reciprocate.

[0015] Preferably, the guide vane is a V-shaped bend plate, with two adjacent V-shaped bend plates overlapping each other. A scraper is installed on the V-shaped bend plate, and the scraper is provided with an opening that allows an adjacent set of V-shaped bend plates to pass through.

[0016] Furthermore, multiple V-shaped bends are stacked on top of each other in a clockwise or counterclockwise direction. The stacking method of the V-shaped bends should be consistent with the swirl direction inside the guide shroud to reduce the amount of paint adhering at the joint of the V-shaped bends. The V-shaped bends are made of plastic plates or thin-walled metal plates with a certain degree of plasticity. The scraper is parallel to the V-shaped bends and is made of hard rubber material with a certain degree of plasticity. The inner wall of the opening is in close contact with the inner wall of the corresponding V-shaped bend.

[0017] Preferably, the inner cylinder is provided with multiple air inlets, and an air volume adjustment valve is installed on each air inlet.

[0018] Furthermore, the air volume regulating valve is preferably a petal-type regulating valve. The petal-type regulating valve includes a valve body, multiple arc-shaped valve plates rotatably installed in the valve body, and a connecting rod synchronous drive component that provides power for the rotation of the arc-shaped valve plates. After the multiple valve plates are closed, they completely seal the valve body. The connecting rod synchronous drive component drives the valve plates to rotate, causing the distance between adjacent valve plates to change, thereby adjusting the amount of air entering the inner cylinder. The air volume regulating valve can also be a butterfly valve, gate valve, or other equivalent valve components with air volume regulating effect.

[0019] Preferably, a paint basin is installed inside the spray booth, and a discharge pipe is provided at the bottom of the paint basin. A switch valve is installed on the discharge pipe. Further, the paint basin is installed on the side of the spray booth away from the steel plate, and the height of the paint basin is lower than the height of the spraying mechanism. A position switch is installed at the paint basin. The position switch is connected to the transverse drive signal through an external PLC system. When the position switch detects that the spraying mechanism is above the paint basin, the transverse drive stops, so that the spraying mechanism stops above the paint basin.

[0020] Preferably, there are multiple nozzles, which are evenly distributed around the hollow shaft, and the outlet ends of the multiple nozzles are far from the central axis of the hollow shaft; further, the outlet ends of the nozzles are at least 2 cm away from the central axis of the hollow shaft.

[0021] Preferably, a paint film thickness measuring instrument is installed on the painting carriage; further, the paint film thickness measuring instrument is installed on the painting carriage and located on one side of the steel plate traveling in the painting mechanism.

[0022] The preferred non-destructive type of paint thickness gauge is a magnetic thickness gauge, eddy current thickness gauge, or ultrasonic thickness gauge. Any commercially available, known product can be used; the structure and principle of the paint thickness gauge will not be further specified or elaborated here. The paint thickness gauge is connected to an external processor (computer or PLC control system) and a display signal, allowing operators to read the paint thickness of the steel plate in real time via the display. When the paint thickness gauge detects that the paint thickness of the steel plate is unqualified, it transmits an electrical signal to the external processor, which then displays the signal on the display and issues a warning, achieving intelligent dynamic monitoring of the steel plate paint application. It should be noted that if the paint thickness gauge is installed inside the spray booth, the detection end of the gauge needs to be cleaned regularly to prevent paint splatter from adhering to the gauge and affecting the accuracy of the paint thickness detection. To minimize the impact of paint splatter on the detection accuracy, it is best to locate the paint thickness gauge outside the spray booth.

[0023] Preferably, the system also includes a shot blasting machine, which is located on the side of the steel plate receiving area of ​​the paint booth, and is used for rust removal treatment of the steel plate surface.

[0024] Preferably, it also includes a drying room, which is located on the side of the steel plate discharge direction of the spray booth, and is used to dry the steel plate after spraying; furthermore, the spray booth is equipped with necessary heating and drying equipment such as an electric dryer; the exhaust gas generated in the spray booth and the drying room is connected to external exhaust gas treatment equipment to avoid direct discharge into the external environment.

[0025] Preferably, the mounting housing is conical in shape, with the tip of the mounting housing facing the direction of the flow guide shroud's outflow.

[0026] Beneficial effects Compared with the prior art, the present invention provides an intelligent spraying equipment for steel pretreatment lines, which has the following beneficial effects: The intelligent spraying equipment in this steel pretreatment line pressurizes the paint and injects it into the nozzles through the paint supply pipeline and hollow cavity. After passing through the nozzles, the paint forms a mist and is sprayed out. The dual-shaft motor drives the inclined blade turbine to rotate, creating a vortex inside the guide shroud. Under the action of the vortex and gravity, the paint mist dispersed in all directions is concentrated in the center of the guide shroud, causing it to fall onto the steel plate. At this time, a negative pressure is generated in the inner cylinder, and the paint that flies out from the edges of the guide shroud is sucked into the collection shroud and flows back into the inner cylinder through the return pipe. Most of the paint is sprayed out again through the guide shroud, which can effectively reduce paint scattering, ensure a clean on-site construction environment, reduce paint waste, and is more environmentally friendly. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the steel plate pretreatment line of the present invention.

[0028] Figure 2 This is a three-dimensional structural diagram of the spray booth of the present invention.

[0029] Figure 3 This is a top view schematic diagram of the spray booth structure of the present invention.

[0030] Figure 4 This is a schematic diagram of the spray booth structure from a bottom view according to the present invention.

[0031] Figure 5 This is the invention Figure 4 Schematic diagram of the cross-sectional structure at point AA.

[0032] Figure 6 This is the invention Figure 4 Schematic diagram of the cross-sectional structure at point BB.

[0033] Figure 7 This is a three-dimensional structural diagram of the painting mechanism of the present invention.

[0034] Figure 8 This is a schematic diagram of the bottom planar structure of the painting mechanism of the present invention.

[0035] Figure 9 This is the invention Figure 8 Schematic diagram of the cross-sectional structure at point CC.

[0036] Figure 10 This is a three-dimensional structural diagram of the painting mechanism of the present invention from another perspective.

[0037] Figure 11 This is the invention Figure 7 A magnified schematic diagram of the structure at point D.

[0038] Figure 12 This is a three-dimensional structural diagram of the collection cover with an arc-shaped flange according to the present invention.

[0039] The attached diagram shows the following components: 1. Feeding roller conveyor; 2. Spray booth; 3. Spray carriage; 4. Transverse drive; 5. Spray pump; 6. Paint supply pipeline; 7. Outer cylinder; 8. Inner cylinder; 9. Mounting housing; 10. Dual-shaft motor; 11. Return pipe; 12. Collection hood; 13. Hollow shaft; 14. Inclined blade turbine; 15. Nozzle; 16. Guide vane; 17. Drive ring frame; 18. Rotary drive component; 19. Drive handle; 20. Inclined chute; 21. Scraper; 22. Air inlet; 23. Air volume regulating valve; 24. Paint basin; 25. Discharge pipe; 26. Switch valve; 27. Paint film thickness gauge; 28. Shot blasting machine; 29. ​​Drying room; 30. Arc-shaped flange. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] Please refer to Figures 1-10 An intelligent spraying equipment for a steel pretreatment line includes a feeding roller conveyor 1, a spray booth 2, a shot blasting machine 28, and a drying chamber 29. The feeding roller conveyor 1 is used to convey steel plates into the spray booth 2. The shot blasting machine 28 is located on the side of the spray booth 2 facing the incoming steel plates and is used for rust removal from the steel plate surface. The drying chamber 29 is located on the side of the spray booth 2 facing the outgoing steel plates and is used for drying the painted steel plates. Furthermore, the spray booth 2 is equipped with necessary heating and drying equipment such as an electric dryer. The exhaust gas generated in the spray booth 2 and the drying chamber 29 is connected to an external exhaust gas treatment device to avoid direct emission into the external environment. The drying chamber 29 and the external exhaust gas treatment device can be based on existing technologies.

[0044] Before the steel plate is sprayed, it is shot blasted by shot blasting machine 28 to remove rust. After shot blasting, the outer wall of the steel plate is formed with uniform concave pits to improve the adhesion of the subsequent paint. At the same time, the steel plate is stably raised due to friction after shot blasting, which is conducive to the volatilization of volatile components in the paint. The steel plate after spraying is put into drying room 29 for drying. The paint volatilization waste gas generated in spraying room 2 and drying room 29 can be further treated by external waste gas treatment equipment.

[0045] Specifically, the shot blasting machine 28 in this embodiment can be the shot blasting and rust removal system disclosed in a steel plate pretreatment production line with publication number CN201871449U, or other equivalent shot blasting and rust removal equipment that can perform shot blasting and rust removal on steel plates. Since it is the current technical structure, the structure and principle of the shot blasting machine 28 will not be described in detail here.

[0046] Please refer to Figures 2-6 A paint spraying carriage 3 is slidably installed inside the paint spraying booth 2. The paint spraying booth 2 is also equipped with a transverse drive 4, a paint pump 5, a paint supply pipeline 6, and a paint spraying mechanism installed on the paint spraying carriage 3, which provides power for the sliding of the paint spraying carriage 3. The transverse drive 4 can drive the paint spraying carriage 3 to move in the direction perpendicular to the direction of travel of the steel plate, so as to achieve full spraying treatment of the steel plate.

[0047] A paint tray 24 is installed inside the spray booth 2. A discharge pipe 25 is provided at the bottom of the paint tray 24, and a switch valve 26 is installed on the discharge pipe 25. Furthermore, the paint tray 24 is installed on the side of the spray booth 2 away from the steel plate. The height of the paint tray 24 is lower than the height of the spraying mechanism. A position switch is installed at the paint tray 24. The position switch is connected to the transverse drive 4 via an external PLC system. When the position switch detects that the spraying mechanism is above the paint tray 24, the transverse drive 4 stops, so that the spraying mechanism stops above the paint tray 24.

[0048] A paint film thickness gauge 27 is installed on the painting carriage 3. Further, the paint film thickness gauge 27 is installed on the painting carriage 3 and located on one side of the steel plate traveling in the painting mechanism. The paint film thickness gauge 27 is preferably a non-destructive magnetic thickness gauge, eddy current thickness gauge, or ultrasonic thickness gauge. Commercially available products are sufficient; the structure and principle of the paint film thickness gauge 27 will not be further specified or elaborated here. The paint film thickness gauge 27 is connected to an external processor (computer or PLC control system) and a display signal, allowing the operator to read the paint thickness of the steel plate in real time via the display. When the paint film thickness gauge 27 detects that the paint thickness of the steel plate is unqualified, the paint film thickness gauge 27 will send a signal... The signal is transmitted to an external processor, which then displays the signal on the monitor and issues an alert, enabling intelligent dynamic monitoring of steel plate painting. It should be noted that if the paint film thickness gauge 27 is installed inside the spray booth 2, the detection end of the gauge 27 needs to be cleaned regularly to prevent paint splatter from adhering to it and affecting the accuracy of the steel plate paint thickness detection. To minimize the impact of paint splatter on the detection accuracy of the gauge 27, it is best to locate the gauge 27 outside the spray booth 2. The spray booth 2 should have a groove allowing the gauge 27 to slide laterally, sealed with a plastic rubber strip, which should also have an opening for sliding.

[0049] The painting mechanism includes an outer cylinder 7, an inner cylinder 8 fixedly installed inside the outer cylinder 7, a mounting housing 9 fixedly installed inside the inner cylinder 8, a dual-shaft motor 10 fixedly installed inside the mounting housing 9, a guide shroud installed at the outlet end of the outer cylinder 7, multiple return pipes 11, and a collection shroud 12. A hollow shaft 13 is rotatably mounted on the dual-shaft motor 10. An inclined blade turbine 14 is fixedly installed at one end of the hollow shaft 13, and a nozzle 15 is installed at the other end of the hollow shaft 13. A hollow cavity communicating with the input end of the nozzle 15 is provided inside the hollow shaft 13. One end of the paint supply pipe 6 is connected to the output end of the paint pump 5, and the other end of the paint supply pipe 6 is rotatably and sealedly connected to the hollow shaft 13. The collection shroud 12 is placed at the edge of the outlet port of the guide shroud. One end of the return pipe 11 passes through the outer cylinder 7 and extends into the interior of the inner cylinder 8.

[0050] Furthermore, the transverse drive 4 is preferably a mechanical slide, but other drives that can drive the paint carriage 3 to slide can also be used. The mechanical slide is equipped with an organ cover and a Siemens servo motor to drive the paint carriage 3. The central axes of the outer cylinder 7, inner cylinder 8, dual-shaft motor 10 and guide shroud are coincident. The guide shroud can be a cylindrical shroud or a conical shroud. An annular air intake channel is formed between the mounting housing 9 and the inner cylinder 8. The inclined blade turbine 14 is installed at the junction of the inner cylinder 8 and the mounting housing 9. The inclined blade turbine 14 is used to pressurize the airflow in the inner cylinder 8 to form a vortex. The paint supply pipe 6 is rotatably sealed to the hollow shaft 13 through a rotating sealing joint. The input end of the paint pump 5 extends into the outer paint supply cylinder. Multiple return pipes 11 are evenly distributed around the collection cover 12. The outer cylinder 7 is provided with a mounting flange, which is fixedly connected to the paint carriage 3 by bolts.

[0051] The paint supply line 6 is made of flexible plastic pipe. A hanging beam is fixedly installed inside the paint booth 2. Multiple sets of hooks are slidably installed on the hanging beam. The paint supply line 6 is fixedly installed on each hook. This can prevent the paint supply line 6 from drooping excessively and thus prevent interference with the movement of the paint spraying trolley 3. In this embodiment, the inner diameter of the collection cover 12 is slightly larger than the maximum outer diameter of the bottom of the guide cover.

[0052] For details, please refer to Figure 8 There are multiple nozzles 15, which are evenly distributed around the hollow shaft 13. The outlet ends of the multiple nozzles 15 are far away from the central axis of the hollow shaft 13. Furthermore, the outlet ends of the nozzles 15 are at least 2 cm away from the central axis of the hollow shaft 13.

[0053] For details, please refer to Figure 9 The mounting housing 9 is cone-shaped, with the tip of the mounting housing 9 facing the direction of the flow guide shroud.

[0054] For details, please refer to Figure 7 , Figure 9 as well as Figure 11 The inner cylinder 8 is provided with multiple air inlets 22, and air volume regulating valves 23 are installed on the air inlets 22; furthermore, the air volume regulating valves 23 are preferably petal-type regulating valves (see specific structure). Figure 11The petal-shaped regulating damper includes a valve body, multiple arc-shaped valve plates rotatably mounted within the valve body, and a connecting rod synchronous drive component that provides power for the rotation of the arc-shaped valve plates. After the multiple valve plates are closed, they completely seal the valve body. The connecting rod synchronous drive component drives the valve plates to rotate, causing the distance between adjacent valve plates to change, thereby adjusting the amount of airflow entering the inner cylinder 8. The airflow regulating valve 23 can also be a butterfly valve, gate valve, or other equivalent valve with airflow regulating effect. By opening each airflow regulating valve 23, the negative pressure in the inner cylinder 8 can be adjusted to prevent excessive paint mist from entering the inner cylinder 8 through the collection hood 12 and return pipe 11 due to excessive negative pressure in the inner cylinder 8, and to prevent the negative pressure value at the collection hood 12 from being too high, thus preventing interference with the paint mist swirling in the guide hood.

[0055] When the steel plate enters the spray booth 2, the guide shroud is located above the steel plate. There should be a gap of at least 10cm between the guide shroud and the steel plate. To adjust the distance between the spraying mechanism and the steel plate, an adjusting screw and nut or other lifting adjustment mechanism can be installed on the spraying trolley 3.

[0056] The mounting housing 9 adopts a conical head shape, which can avoid interference with the paint mist vortex formed inside the guide shroud. The conical head structure is located in the middle of the paint mist vortex, which can reduce the adhesion of paint mist at the mounting housing 9. The use of multiple nozzles 15 to atomize and spray the paint can further improve the uniformity of paint distribution. At the same time, the rotation of the hollow shaft 13 drives the nozzles 15 to rotate, providing the initial rotational velocity for the paint mist sprayed by the nozzles 15, further improving the vortex effect of the paint mist, and causing the paint mist to gather and be sprayed onto the steel plate surface.

[0057] It should be noted that when the equipment is not in the painting operation state, the bottom of the collection hood 12 can be sealed with a container containing the corresponding paint thinner, the air volume adjustment valves 23 can be closed, and the air inlet 22 can be sealed. After the dual-shaft motor 10 is turned on, the evaporated paint thinner circulates in the collection hood 12, the return pipe 11, the inner cylinder 8 and the guide hood. The thinner can dilute and clean the paint adhering to the inside of the painting mechanism, and the cleaned paint dirt falls into the container. The equipment should be cleaned at least once after the operation is completed, and the inside of the painting mechanism can also be cleaned regularly as needed.

[0058] In another embodiment, when the guide shroud is of a fixed size, to prevent paint dripping during the spraying process, an arc-shaped flange 30 with an inner diameter slightly smaller than the outer diameter of the guide shroud can be provided at the bottom of the collection shroud 12 (see specific structure). Figure 12The edge of the arc-shaped flange 30 extending into the guide shroud should not exceed 0.5 mm to avoid interfering with the outflow of airflow inside the guide shroud. The inner wall of the arc-shaped flange 30 is inclined obliquely upward to the center of the guide shroud. The arc-shaped flange 30 and the collection shroud 12 collect the paint dripping along the inner wall of the guide shroud and the inner wall of the return pipe 11 during the spraying operation to prevent the paint from dripping onto the steel plate and to extend the cleaning interval inside the spraying mechanism.

[0059] For details, please refer to Figures 7-10 The flow guide includes multiple guide vanes 16 hinged to the outlet end of the inner cylinder 8, a drive ring frame 17 rotatably mounted on the outside of the outer cylinder 7, and a rotary drive component 18 that provides power for the rotation of the drive ring frame 17. The guide vanes 16 are provided with drive handles 19, and the drive ring frame 17 is provided with multiple inclined grooves 20 arranged along the axial direction of the drive ring frame 17. The drive handles 19 extend into the corresponding inclined grooves 20. Further, the rotary drive component 18 is preferably a telescopic cylinder, which can be an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder. One end of the telescopic cylinder is hinged to the outer wall of the inner cylinder 8, and the other end of the telescopic cylinder is hinged to the drive ring frame 17. The rotary drive component 18 can also be a brake motor and a drive wheel. The drive wheel is fixedly mounted on the output end of the brake motor and is connected to the drive ring frame 17 in a transmission manner. The rotary drive component 18 can also be other equivalent components that drive the drive ring frame 17 to reciprocate.

[0060] For details, please refer to Figures 7-10 The guide vane 16 adopts a V-shaped bend, with adjacent V-shaped bends overlapping each other. A scraper 21 is installed on the V-shaped bend, and the scraper 21 has an opening allowing adjacent sets of V-shaped bends to pass through. Furthermore, multiple V-shaped bends are overlapped in a clockwise or counterclockwise direction, and the overlapping method of the V-shaped bends should be consistent with the swirling direction inside the guide vane (see details). Figure 8 (The direction of rotation of the middle arrow) to reduce the amount of paint adhering at the joint of the V-shaped bend; the V-shaped bend is made of plastic plate or thin-walled metal plate with a certain degree of plasticity to ensure that the two adjacent V-shaped bends are tightly overlapped; the scraper 21 is parallel to the V-shaped bend and is made of hard rubber material with a certain degree of plasticity, and the inner wall of the opening is in close contact with the inner wall of the corresponding V-shaped bend.

[0061] Under the same pressure, different paints sprayed from nozzle 15 have different spray ranges. By activating the rotary drive 18, the rotary drive 18 drives the drive ring frame 17 to rotate, and the drive handle 19 slides in the inclined slide groove 20. During the up and down movement of the drive handle 19, the guide vanes 16 rotate around the hinge point. The guide vanes 16 converge or separate from each other to adjust the size of the internal space of the guide shroud, thereby adjusting the spray range of the paint mist in the guide shroud and the concentration of the paint mist to meet the needs of multiple working conditions.

[0062] When paint accumulates on the inner wall of the guide shroud, there is a risk of dripping, affecting the coating quality of the steel plate. Therefore, after one or more reciprocating spraying operations, the spraying mechanism stops above the paint basin 24 under the drive of the transverse drive 4. The rotation drive 18 drives the drive ring frame 17 to rotate. After transmission through the drive handle 19, each guide vane 16 synchronously gathers around the hinge point to one side of the guide shroud center. Meanwhile, one set of V-shaped bends scrapes off the paint adhering to one bend of the adjacent set of V-shaped bends. The scraped paint accumulates at the vertical edge of the V-shaped bends, and the paint flows along the opposite side. As the V-shaped bend plate slides down the vertical edge, the paint adhering to the other bend of the V-shaped bend plate is scraped off by the scraper 21. The collected paint then forms droplets along the vertical edge of the scraper 21 and falls down. After agglomerating on each guide vane 16, it forms a constricted trumpet shape. The air volume adjustment valve 23 at each air inlet 22 is in a fully open state. By starting the dual-shaft motor 10, the air pressure generated in the guide shroud blows the paint droplets away, and the droplets fall into the paint basin 24 for collection. The paint collected in the paint basin 24 can be discharged through the discharge pipe 25 and collected after opening the switch valve 26.

[0063] The intelligent spraying equipment for the steel pretreatment line provided by this invention operates as follows: Steel plates are conveyed to shot blasting machine 28 via feeding roller conveyor 1. After shot blasting and rust removal, the steel plates are sent to spray booth 2. Paint pump 5 pressurizes the paint and injects it into nozzles 15 through paint supply pipe 6 and the hollow cavity. Dual-shaft motor 10 drives inclined blade turbine 14 and each nozzle 15 to rotate. The paint passes through nozzles 15 and forms a paint mist, which is sprayed out. The paint mist has its own initial rotational velocity and forms a vortex within the guide shroud under the action of the inclined blade turbine 14. Under the action of the vortex and gravity, the dispersed paint mist is guided to the surrounding area. The paint mist concentrates in the middle of the hood, causing it to fall onto the steel plate. At this time, a negative pressure is generated inside the inner cylinder 8. A small amount of paint that escapes from the edges of the guide hood is sucked into the collection hood 12 and flows back into the inner cylinder 8 through the return pipe 11. Most of the paint is sprayed out again through the guide hood. The transverse drive 4 drives the painting mechanism to move back and forth in the paint booth 2 to fully spray the top surface of the steel plate. After spraying, the steel plate enters the drying chamber 29 for drying, completing the spraying operation of the steel plate.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. An intelligent spraying device for a steel pretreatment line, comprising a feeding roller conveyor (1) and a spray booth (2), wherein the feeding roller conveyor (1) is used for conveying steel plates into the spray booth (2); characterized in that, It also includes a paint carriage (3) that is slidably installed in the paint booth (2), a transverse drive (4) that provides power for the sliding of the paint carriage (3), a paint pump (5), a paint supply pipeline (6), and a paint spraying mechanism installed on the paint carriage (3). The paint spraying mechanism includes an outer cylinder (7), an inner cylinder (8) fixedly installed in the outer cylinder (7), a mounting housing (9) fixedly installed in the inner cylinder (8), a dual-axis motor (10) fixedly installed in the mounting housing (9), a guide shroud installed at the outlet end of the outer cylinder (7), multiple return pipes (11), and a collection shroud (12). The dual-axis motor (10) A hollow shaft (13) is rotatably mounted on the hollow shaft (13). A slanted blade turbine (14) is fixedly mounted on one end of the hollow shaft (13). A nozzle (15) is mounted on the other end of the hollow shaft (13). A hollow cavity is provided inside the hollow shaft (13) that is connected to the input end of the nozzle (15). One end of the paint supply pipe (6) is connected to the output end of the paint pump (5). The other end of the paint supply pipe (6) is rotatably and sealed to the hollow shaft (13). The collection cover (12) is placed at the edge of the outlet port of the guide cover. One end of the return pipe (11) passes through the outer cylinder (7) and extends into the inner cylinder (8).

2. The intelligent spraying equipment for the steel pretreatment line according to claim 1, characterized in that, The flow guide includes multiple flow guide vanes (16) hinged to the outlet end of the inner cylinder (8), a drive ring frame (17) rotatably mounted on the outside of the outer cylinder (7), and a rotary drive component (18) that provides power for the rotation of the drive ring frame (17). The flow guide vanes (16) are provided with drive handles (19), and the drive ring frame (17) is provided with multiple inclined grooves (20) inclined along the axial direction of the drive ring frame (17). The drive handles (19) extend into the corresponding inclined grooves (20).

3. The intelligent spraying equipment for the steel pretreatment line according to claim 2, characterized in that, The guide vane (16) adopts a V-shaped bend plate, with two adjacent V-shaped bend plates overlapping each other. A scraper (21) is installed on the V-shaped bend plate, and the scraper (21) has an opening that allows an adjacent set of V-shaped bend plates to pass through.

4. The intelligent spraying equipment for steel pretreatment line according to claim 1, characterized in that, The inner cylinder (8) is provided with multiple air inlets (22), and an air volume adjustment valve (23) is installed on the air inlet (22).

5. The intelligent spraying equipment for steel pretreatment line according to claim 1, characterized in that, The spray booth (2) is equipped with a paint basin (24), and a discharge pipe (25) is provided at the bottom of the paint basin (24). A switch valve (26) is installed on the discharge pipe (25).

6. The intelligent spraying equipment for the steel pretreatment line according to claim 1, characterized in that, There are multiple nozzles (15), which are evenly distributed around the hollow shaft (13) in the circumference. The outlet ends of the multiple nozzles (15) are far away from the central axis of the hollow shaft (13).

7. The intelligent spraying equipment for the steel pretreatment line according to claim 1, characterized in that, The paint spraying cart (3) is equipped with a paint film thickness measuring instrument (27).

8. The intelligent spraying equipment for the steel pretreatment line according to claim 1, characterized in that, It also includes a shot blasting machine (28), which is located on the side of the steel plate receiving direction of the paint booth (2), and the shot blasting machine (28) is used for rust removal treatment of the steel plate surface.

9. The intelligent spraying equipment for the steel pretreatment line according to claim 1, characterized in that, It also includes a drying room (29), which is located on the side of the steel plate discharge direction of the spray painting room (2), and the drying room (29) is used to dry the steel plate after spray painting.

10. The intelligent spraying equipment for the steel pretreatment line according to claim 1, characterized in that, The mounting housing (9) is cone-shaped, with the tip of the mounting housing (9) facing the flow direction of the guide shroud.

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