A visual inspection apparatus based on electrostatic spraying for metal working

Abstract

The application discloses a kind of visual inspection equipment based on metal processing electrostatic spraying, it is related to visual inspection field, including detection box and conveying belt, multiple groups of negative pressure holes are opened in the conveying belt, and the inner wall of the negative pressure hole of conveying belt is equipped with adapter, the detection box is equipped with the negative pressure mechanism for cooperating with adapter.This application, by setting negative pressure adsorption structure in conveying belt, and cooperating with automatic docking negative pressure mechanism and guiding mechanism, forms stable and reliable negative pressure fixation to metal workpiece in detection process, fundamentally solves the technical problems that L-shaped, U-shaped and other small workpieces are easy to deviate, skew, roll over and shift under the action of air curtain airflow, so that the workpiece always maintains the preset posture and position into the detection area, avoids the visual camera shooting visual field deviation, defect recognition area dislocation and other problems, significantly improves the accuracy of coating defect detection and detection stability.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology, specifically to a visual inspection device based on electrostatic spraying in metal processing. Background Technology

[0002] In the field of metal processing and surface treatment, appearance quality inspection after electrostatic spraying is a key process to ensure the integrity and consistency of the coating on the workpiece. Automated inspection equipment based on machine vision can replace manual labor to complete the identification of defects such as coating particles, pinholes, and scratches. It has the advantages of stable detection, high efficiency, and low missed detection rate, and is widely used in the online quality inspection of various metal workpieces after spraying.

[0003] Existing visual inspection equipment for electrostatic spraying in metal processing mainly consists of an inspection chamber, an industrial camera, a conveyor belt, lighting components, and an air curtain mechanism. To prevent dust, lint, and other debris from adhering to the workpiece surface and affecting imaging and recognition accuracy, air curtain devices are installed at the inlet and outlet of the inspection chamber. The air curtain forms an airflow barrier, pre-cleaning the workpiece surface before it enters the inspection area, while also isolating the air convection inside and outside the chamber, reducing the entry of external debris into the inspection area, and improving imaging clarity and inspection stability. This is the current standard configuration for post-spraying visual inspection.

[0004] However, in actual inspection, such visual inspection equipment is prone to positional deviation and posture distortion when handling small, high-center-of-gravity workpieces such as L-shaped and U-shaped pieces during conveyor belt operation. Especially when passing through the inlet and outlet air curtains, the airflow of the air curtain will directly impact the workpiece, which can easily cause small irregularly shaped workpieces to be blown over, overturned, or displaced. This results in the workpiece's placement angle and center position when entering the inspection area being inconsistent with the preset standard state, causing deviation in the field of view of the visual camera and misalignment of the defect recognition area, which significantly reduces the accuracy of defect detection and the stability of inspection. Summary of the Invention

[0005] The purpose of this invention is to provide a visual inspection device based on electrostatic spraying in metal processing, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a visual inspection device based on electrostatic spraying of metal processing, comprising an inspection box and a conveyor belt, wherein the conveyor belt has multiple sets of negative pressure holes, and the inner wall of each negative pressure hole of the conveyor belt is equipped with a docking device; the inspection box is provided with a negative pressure mechanism that works with the docking device, and a guiding mechanism that works with the docking device and the negative pressure mechanism. The docking device includes a connecting pipe installed on the inner wall of the conveyor belt and connected to the negative pressure hole, and a gathering box is installed at the bottom of the connecting pipe. An air guide pipe is installed at the bottom of the gathering box. A connector is slidably provided at the end of the air guide pipe, and a spring connected to the connector is installed inside the air guide pipe. The negative pressure mechanism includes a negative pressure box installed inside the detection box, and a negative pressure fan is provided on the outer wall of the negative pressure box. A moving belt is provided inside the negative pressure box, and multiple connecting pipes that mate with the connector and communicate with the inside of the negative pressure box are provided on the moving belt. The guiding mechanism includes a drive wheel rotatably mounted on the outer wall of the connector, a guide plate mounted on one end of the negative pressure box, and a top block mounted on the other end of the negative pressure box. In use, the guide plate and the drive wheel cooperate to push the connector upward, so as to ensure that the connector moves smoothly to the top of the connector tube.

[0007] Preferably, the conveyor belt has multiple sets of ventilation holes, the detection box is equipped with an air curtain above the ventilation holes and a suction box below the ventilation holes, and the top of the suction box is equipped with a contact wheel that is in contact with the conveyor belt, and the bottom of the suction box is equipped with a vacuum cleaner.

[0008] Preferably, each group of negative pressure holes includes multiple through holes distributed at equal intervals, and the bottom of each through hole is connected to a connecting pipe. The multiple connecting pipes connected to a group of negative pressure holes are connected to a gathering box, and an iris mechanism is provided at the connection position between the gathering box and the connecting pipe.

[0009] Preferably, the cross-section of the connector is T-shaped, and a pressure ring that fits against the connector tube is installed on the outer side wall of the connector. The contact surface between the pressure ring and the connector tube is made of rubber.

[0010] Preferably, the moving belt is designed in the shape of a racetrack, and the moving belt is slidably connected to the inner wall of the negative pressure box. The connection between the moving belt and the negative pressure box is sealed, and multiple support wheels that are in contact with the moving belt are installed inside the negative pressure box.

[0011] Preferably, the opening of the connecting pipe is designed to open outwards, and a sealing cap for sealing the opening is rotatably installed on the outer wall of the connecting pipe, and a torsion spring corresponding to the sealing cap is also provided in the connecting pipe.

[0012] Preferably, the guiding mechanism includes control wheels symmetrically installed on the outer walls of both sides of the air duct, and control frames installed on the detection box and cooperating with the control wheels. The number of control wheels on one side of the outer wall of the air duct is at least two, and two sets of control frames are symmetrically installed in the detection box. Each set of control frames includes two frames for guiding the control wheels, and the ends of the control frames are designed to open outwards.

[0013] Preferably, the guiding mechanism further includes a friction wheel rotatably mounted on the outer wall of the connecting pipe and connected to the sealing cover. The outer end faces of the guide plate and the top block are both designed with inclined surfaces corresponding to the transmission wheel. The bottom of the guide plate is designed with an arc surface that cooperates with the friction wheel. As the friction wheel moves with the connecting pipe, it will contact the bottom surface of the guide plate. The sealing cover is opened by the cooperation between the guide plate and the friction wheel.

[0014] Preferably, each of the iris mechanisms is provided with an operating handle that is movably mounted on the gathering box, and a movable plate is slidably mounted on the outer wall of the gathering box. Multiple sets of push rods corresponding to the movable plate are installed at equal intervals on the top of the movable plate. Each set of push rods includes two columns, and the distance between the columns is greater than the lateral distance that the operating handle moves during the opening and closing of the iris mechanism.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, by setting a negative pressure adsorption structure on the conveyor belt and cooperating with an automatically docking negative pressure mechanism and a guiding mechanism, forms a stable and reliable negative pressure fixation for the metal workpiece during the inspection process. This fundamentally solves the technical problem that small workpieces such as L-shaped and U-shaped workpieces are prone to displacement, tilting, tipping, and shifting under the action of airflow. It ensures that the workpiece always maintains a preset posture and position when entering the inspection area, avoiding problems such as visual camera field of view deviation and defect identification area misalignment, and significantly improving the accuracy of coating defect detection and inspection stability.

[0016] 2. This invention employs a guiding mechanism composed of guide wheels, a control frame, a transmission wheel, and a guide plate to achieve high-precision automatic alignment, automatic insertion, and automatic disengagement of the connector and the connecting pipe. Combined with a circulating moving belt, it achieves continuous and uninterrupted negative pressure supply, maintaining stable sealing and continuous adsorption force even in assembly line operation, without the need for machine stoppage for adjustment, significantly improving online inspection efficiency, and is suitable for automated inspection scenarios after large-volume metal workpiece spraying.

[0017] 3. This invention incorporates an iris mechanism within the negative pressure path, allowing for flexible opening or closing of corresponding negative pressure through-holes based on the size and shape of the workpiece. This enables precise adjustment of the adsorption range, ensuring effective fixation of workpieces of different specifications while avoiding energy waste caused by ineffective negative pressure. This enhances the equipment's versatility and adaptability. Simultaneously, the suction box, in conjunction with a vacuum cleaner, removes floating dust, lint, and other impurities from above the conveyor belt, significantly reducing the interference of impurities on imaging quality. Combined with a stable workpiece posture, this further improves the vision system's ability to identify minute defects such as coating particles, pinholes, and scratches, as well as the clarity of the image. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of a partial part of the present invention; Figure 3 This is a schematic diagram of the structure of components such as the impurity suction box and the negative pressure mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the present invention after partial cross-section; Figure 5 This is a schematic diagram of the negative pressure mechanism of the present invention; Figure 6This is a schematic diagram of the structure of the connector of the present invention when it is not connected to the connecting pipe; Figure 7 This is a schematic diagram of the structure of the connecting tube and the gathering box of the present invention, partially cut open to expose the iris mechanism.

[0019] In the diagram: 1. Detection box; 2. Conveyor belt; 3. Air curtain; 4. Ventilation port; 5. Sludge suction box; 51. Contact wheel; 52. Vacuum cleaner; 6. Negative pressure port; 7. Connector; 71. Connecting pipe; 72. Gathering box; 73. Air guide pipe; 74. Connecting joint; 75. Spring; 76. Pressure ring; 8. Negative pressure mechanism; 80. Negative pressure fan; 81. Negative pressure box; 82. Moving belt; 83. Connecting pipe; 84. Sealing cover; 9. Guide mechanism; 91. Positioning wheel; 92. Positioning frame; 93. Transmission wheel; 94. Guide plate; 95. Friction wheel; 96. Top block; 10. Iris recognition mechanism; 11. Operating handle; 12. Moving plate; 13. Push rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0021] Please see Figures 1-7 The present invention provides the following technical solution: a visual inspection device based on electrostatic spraying of metal processing, comprising an inspection box 1 and a conveyor belt 2, wherein the conveyor belt 2 has multiple sets of negative pressure holes 6, and a connector 7 is installed on the inner wall of each negative pressure hole 6 on the conveyor belt 2; the inspection box 1 is provided with a negative pressure mechanism 8 that cooperates with the connector 7, and a guide mechanism 9 that cooperates with the connector 7 and the negative pressure mechanism 8; the connector 7 includes a connecting pipe 71 installed on the inner wall of the conveyor belt 2 and communicating with the negative pressure holes 6, and a gathering box 72 is installed at the bottom of the connecting pipe 71, and an air guide pipe 73 is installed at the bottom of the gathering box 72; a connector 74 is slidably provided at the end of the air guide pipe 73, and the air guide pipe 73 is provided with a connecting tube 74. A spring 75 connected to the connector 74 is installed; the negative pressure mechanism 8 includes a negative pressure box 81 installed in the detection box 1, and a negative pressure fan 80 is provided on the outer wall of the negative pressure box 81. A moving belt 82 is provided inside the negative pressure box 81, and multiple connecting pipes 83 that cooperate with the connector 74 and communicate with the inside of the negative pressure box 81 are provided on the moving belt 82; the guide mechanism 9 includes a drive wheel 93 rotatably installed on the outer wall of the connector 74 and a guide plate 94 installed at one end of the negative pressure box 81, and a top block 96 installed at the other end of the negative pressure box 81. In use, the guide plate 94 cooperates with the drive wheel 93 to push the connector 74 upward to ensure that the connector 74 moves smoothly to the top of the connecting pipe 83.

[0022] As one embodiment of the present invention, the conveyor belt 2 is provided with multiple sets of ventilation holes 4, the detection box 1 is provided with an air curtain 3 located above the ventilation holes 4 and a suction box 5 located below the ventilation holes 4, and the top of the suction box 5 is provided with a contact wheel 51 that is in contact with the conveyor belt 2, and the bottom of the suction box 5 is provided with a vacuum cleaner 52. The air curtain 3 forms a dustproof air curtain, and the dust collection box 5 works with the vacuum cleaner 52 to remove floating dust in time, reducing the amount of impurities entering the detection area and interfering with imaging.

[0023] As one embodiment of the present invention, each group of negative pressure holes 6 includes multiple through holes distributed at equal intervals. The bottom of each through hole is connected to a connecting pipe 71. The multiple connecting pipes 71 connected to a group of negative pressure holes 6 are connected to a gathering box 72. An iris mechanism 10 is provided at the position where the gathering box 72 is connected to the connecting pipe 71. The iris mechanism 10 can individually control the opening and closing of each through hole, adapting to the adsorption range of workpieces of different sizes and avoiding ineffective negative pressure waste.

[0024] As one embodiment of the present invention, the cross section of the connector 74 is T-shaped, and a pressure ring 76 that is in contact with the connector tube 83 is installed on the outer side wall of the connector 74, and the contact surface between the pressure ring 76 and the connector tube 83 is made of rubber. The rubber pressure ring 76 improves the sealing performance of the connection, prevents negative pressure leakage, and ensures stable adsorption force.

[0025] As one embodiment of the present invention, the movable belt 82 is designed in the shape of a racetrack, and the movable belt 82 is slidably connected to the inner wall of the negative pressure box 81. The connection position between the movable belt 82 and the negative pressure box 81 is sealed, and multiple support wheels that are in contact with the movable belt 82 are installed inside the negative pressure box 81. Ensure stable negative pressure within the negative pressure box 81, prevent the support wheels from moving and causing the belt 82 to sag, and ensure docking accuracy.

[0026] As one embodiment of the present invention, the opening of the connecting pipe 83 is designed to open outward, and a sealing cover 84 for sealing its opening is rotatably installed on the outer wall of the connecting pipe 83, and a torsion spring corresponding to the sealing cover 84 is also provided in the connecting pipe 83. The open design facilitates the insertion of the connector 74, and the sealing cap 84 automatically closes when not in the mating state to maintain negative pressure inside the chamber.

[0027] As one embodiment of the present invention, the guide mechanism 9 includes control wheels 91 symmetrically installed on the outer walls of both sides of the air guide tube 73, and control frames 92 installed on the detection box 1 and cooperating with the control wheels 91. The number of control wheels 91 on one side of the outer wall of the air guide tube 73 is at least two. Two sets of control frames 92 are symmetrically installed in the detection box 1. Each set of control frames 92 includes two frames for guiding the control wheels 91, and the ends of the control frames 92 are designed to open outwards. The control wheel 91 and the control frame 92 work together to achieve precise guidance of the docking device 7, ensuring that the center of the docking joint 74 and the docking pipe 83 are aligned.

[0028] As one embodiment of the present invention, the guide mechanism 9 further includes a friction wheel 95 rotatably mounted on the outer wall of the connecting pipe 83 and connected to the sealing cover 84. The outer end faces of the guide plate 94 and the top block 96 are both designed with inclined surfaces corresponding to the transmission wheel 93. The bottom of the guide plate 94 is designed with an arc surface that cooperates with the friction wheel 95. During the movement of the friction wheel 95 following the connecting pipe 83, it will contact the bottom surface of the guide plate 94. The sealing cover 84 is opened by the cooperation between the guide plate 94 and the friction wheel 95. When the friction wheel 95 contacts the guide plate 94, the sealing cover 84 is automatically unscrewed, achieving simultaneous opening and docking.

[0029] As one embodiment of the present invention, each iris mechanism 10 is provided with an operating handle 11 movably mounted on a gathering box 72, and a movable plate 12 is slidably mounted on the outer wall of the gathering box 72. Multiple sets of push rods 13 corresponding to the movable plate 12 are installed at equal intervals on the top of the movable plate 12. Each set of push rods 13 includes two columns, and the distance between the columns is greater than the lateral distance that the operating handle 11 moves during the opening and closing of the iris mechanism 10. The push rod 13 and the moving plate 12 can open and close all iris mechanisms 10 with one click, or they can be adjusted individually to adapt to different workpiece adsorption needs.

[0030] Working principle: Before operation, this visual inspection equipment based on electrostatic spraying of metal processing adjusts the number of effective adsorption holes in the negative pressure hole 6 according to the actual size and placement area of ​​the metal workpiece to be inspected. During adjustment, if all holes in the negative pressure hole 6 need to be opened, the push rod 13 is pushed directly, causing it to move the moving plate 12 synchronously. This causes multiple sets of push rods 13 on the moving plate 12 to push all the operating handles 11 simultaneously, opening all the iris mechanisms 10 at once, thus enabling air to pass through all the holes. If only some holes need to be opened, the corresponding operating handle 11 can be pushed individually to selectively open the required iris mechanism 10, thereby precisely controlling the negative pressure adsorption range and adapting to the fixing requirements of workpieces of different sizes. After adjustment, the detection box 1 is started, and the conveyor belt 2, air curtain 3, vacuum cleaner 52 and negative pressure mechanism 8 enter the running state simultaneously. When the conveyor belt 2 is running, it will drive multiple sets of docking devices 7 at the bottom to move forward synchronously. As the docking devices 7 gradually approach the control frame 92, the control wheels 91 on both sides of the outer wall of the air guide pipe 73 are guided by the outward opening end of the control frame 92 and smoothly enter the limiting area between the control frames 92. After that, the control frame 92 will provide double-sided support and guidance for the air guide pipe 73 to ensure that the position of the air guide pipe 73 is stable during the process of the conveyor belt 2 driving the docking devices 7 to move towards the negative pressure mechanism 8. Because at least two sets of connectors 74 are in the plugged state with connectors 83 in the initial state of the equipment, when the conveyor belt 2 moves, it will drive the moving belt 82 to rotate synchronously through the interlocking action of the connectors 74 and connectors 83; when the control wheel 91 enters the control frame 92 and continues to move, the transmission wheel 93 on the outer wall of the connector 74 contacts and is pressed against the inclined surface of the guide plate 94, pushing the connector 74 to retract upward along the air pipe 73, at which time the spring 75 is compressed; then the transmission wheel 93 slides along the top surface of the guide plate 94. At the same time, the moving belt 82 will drive the connecting pipe 83 to move synchronously. The friction wheel 95 on the outer wall of the connecting pipe 83 will move to the bottom of the guide plate 94 and generate friction with the bottom surface of the guide plate 94, forcing the friction wheel 95 to rotate, driving the sealing cover 84 to rotate against the torsion spring torque, and automatically opening the connecting pipe 83. When the connecting pipe 83 moves with the moving belt 82 to directly below the connecting joint 74, the drive wheel 93 disengages from the guide plate 94, the connecting joint 74 loses its upward constraint, and under the elastic force of the spring 75, it quickly extends downward and inserts into the inside of the connecting pipe 83 until the pressure ring 76 tightly fits the top opening of the connecting pipe 83, completing the sealing connection and ensuring that the negative pressure transmission does not leak. Since the drive shaft of the vacuum cleaner 52 is connected to the drive shaft of the negative pressure fan 80 through the pulley assembly, the moving belt 82 will synchronously drive the negative pressure fan 80 to rotate, so that the negative pressure box 81 will continuously form a negative pressure state. When the connecting pipe 83 and the docking device 7 are fully connected, the negative pressure in the negative pressure box 81 is transmitted to the negative pressure hole 6 on the surface of the conveyor belt 2 through the connecting pipe 83, the docking device 74, the air guide pipe 73, the gathering box 72, and the connecting pipe 71 in sequence. This firmly adsorbs and fixes the workpiece placed on the negative pressure hole 6, so that the workpiece will not be blown over, shifted or flipped by the airflow when passing through the air curtain 3 and the inspection box 1, ensuring the stability of the workpiece posture and improving the visual inspection accuracy and pass rate. During the dust removal process of the workpiece passing through the air curtain 3, the dust collection box 5 continuously adsorbs floating debris such as dust and fluff above the conveyor belt 2 through the air vent 4 under the negative pressure of the vacuum cleaner 52, reducing the interference of debris entering the detection box 1 with the shooting and recognition, further improving the detection stability and imaging clarity. The detection box 1 has a built-in detection camera to perform visual inspection of the workpiece. After the workpiece completes the inspection and leaves the inspection area, the transmission wheel 93 contacts the inclined surface of the top block 96, which pushes the connector 74 upward again and separates it from the connector tube 83. The sealing cover 84 of the connector tube 83 automatically closes under the action of the torsion spring, completing one cycle of adsorption, inspection and reset.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A visual inspection device based on electrostatic spraying for metal processing, comprising an inspection box (1) and a conveyor belt (2), characterized in that: The conveyor belt (2) has multiple sets of negative pressure holes (6), and the inner wall of the negative pressure holes (6) of the conveyor belt (2) is equipped with docking devices (7). The detection box (1) is equipped with a negative pressure mechanism (8) that works with the docking device (7), and a guide mechanism (9) that works with the docking device (7) and the negative pressure mechanism (8). The docking device (7) includes a connecting pipe (71) installed on the inner wall of the conveyor belt (2) and connected to the negative pressure hole (6), and a gathering box (72) is installed at the bottom of the connecting pipe (71), and an air guide pipe (73) is installed at the bottom of the gathering box (72). A connector (74) is slidably provided at the end of the air guide pipe (73), and a spring (75) connected to the connector (74) is installed inside the air guide pipe (73). The negative pressure mechanism (8) includes a negative pressure box (81) installed in the detection box (1), and a negative pressure fan (80) is provided on the outer wall of the negative pressure box (81). A moving belt (82) is provided inside the negative pressure box (81), and a plurality of connecting pipes (83) that cooperate with the connecting pipe (74) and communicate with the inside of the negative pressure box (81) are provided on the moving belt (82). The guiding mechanism (9) includes a drive wheel (93) rotatably mounted on the outer wall of the connector (74), a guide plate (94) mounted on one end of the negative pressure box (81), and a top block (96) mounted on the other end of the negative pressure box (81). In use, the guide plate (94) cooperates with the drive wheel (93) to push the connector (74) upward, so as to ensure that the connector (74) moves smoothly to the top of the connector (83).

2. The visual inspection equipment based on electrostatic spraying of metal processing according to claim 1, characterized in that: The conveyor belt (2) has multiple sets of ventilation holes (4). The detection box (1) is equipped with an air curtain (3) above the ventilation holes (4) and a dust collection box (5) below the ventilation holes (4). The dust collection box (5) is equipped with a contact wheel (51) that is in contact with the conveyor belt (2) on the top and a vacuum cleaner (52) at the bottom.

3. The visual inspection equipment based on electrostatic spraying for metal processing according to claim 1, characterized in that: Each group of negative pressure holes (6) includes multiple through holes distributed at equal intervals. The bottom of each through hole is connected to a connecting pipe (71). The multiple connecting pipes (71) connected to a group of negative pressure holes (6) are connected to a gathering box (72). An iris mechanism (10) is provided at the position where the gathering box (72) is connected to the connecting pipe (71).

4. The visual inspection equipment based on electrostatic spraying for metal processing according to claim 1, characterized in that: The cross section of the connector (74) is T-shaped, and a pressure ring (76) that is in contact with the connector tube (83) is installed on the outer side wall of the connector (74), and the contact surface between the pressure ring (76) and the connector tube (83) is made of rubber.

5. A visual inspection device based on electrostatic spraying for metal processing according to claim 1, characterized in that: The moving belt (82) is designed in the shape of a racetrack, and the moving belt (82) is slidably connected to the inner wall of the negative pressure box (81). The connection between the moving belt (82) and the negative pressure box (81) is sealed, and multiple support wheels that are in contact with the moving belt (82) are installed inside the negative pressure box (81).

6. The visual inspection equipment based on electrostatic spraying for metal processing according to claim 1, characterized in that: The opening of the connecting pipe (83) is designed to open outwards, and a sealing cap (84) for sealing its opening is rotatably installed on the outer wall of the connecting pipe (83), and a torsion spring corresponding to the sealing cap (84) is also provided in the connecting pipe (83).

7. A visual inspection device based on electrostatic spraying for metal processing according to claim 6, characterized in that: The guiding mechanism (9) includes control wheels (91) symmetrically installed on the outer walls of both sides of the air duct (73), and control frames (92) installed on the detection box (1) and cooperating with the control wheels (91). The number of control wheels (91) on one side of the outer wall of the air duct (73) is at least two. Two sets of control frames (92) are symmetrically installed in the detection box (1). Each set of control frames (92) includes two frames for guiding the control wheels (91), and the ends of the control frames (92) are designed to open outwards.

8. A visual inspection device based on electrostatic spraying for metal processing according to claim 7, characterized in that: The guide mechanism (9) also includes a friction wheel (95) rotatably mounted on the outer wall of the connecting pipe (83) and connected to the sealing cover (84). The outer end faces of the guide plate (94) and the top block (96) are both designed with inclined surfaces corresponding to the transmission wheel (93). The bottom of the guide plate (94) is designed with an arc surface that cooperates with the friction wheel (95). As the friction wheel (95) moves with the connecting pipe (83), it will contact the bottom surface of the guide plate (94). The sealing cover (84) is opened by the cooperation between the guide plate (94) and the friction wheel (95).

9. A visual inspection device based on electrostatic spraying for metal processing according to claim 3, characterized in that: Each iris mechanism (10) is provided with an operating handle (11) that is movably mounted on a gathering box (72). A movable plate (12) is slidably mounted on the outer wall of the gathering box (72). Multiple sets of push rods (13) corresponding to the movable plate (12) are installed at equal intervals on the top of the movable plate (12). Each set of push rods (13) includes two columns, and the distance between the columns is greater than the lateral distance that the operating handle (11) moves during the opening and closing of the iris mechanism (10).

Images