On-line detection device for zinc dross on surface of hot-dip galvanized plate

Abstract

The invention discloses an online detection device for zinc dross on the surface of a hot galvanized sheet, and relates to the technical field of zinc dross detection.The online detection device comprises a base, a fixing seat is arranged above the base, a fixing plate is arranged on the side face of the fixing seat, a pair of transverse rods is arranged on the side face of the fixing plate, and the two transverse rods are fixedly connected with the fixing plate through connecting frames; the two cross rods are respectively positioned right above and right below the zinc plate; the detection units are located at the bottom of the transverse rod and used for conducting online zinc dross detection on the bent surfaces of the upper side and the lower side of the zinc plate, the detection units capable of being self-adaptive to the bent surfaces of the special-shaped galvanized plate are arranged in the device, XRF detection heads are arranged above the sunken positions and the protruding positions of the zinc plate in a grouping mode, and equidistant detection is kept; the problem that the full-inspection efficiency and accuracy of a production line cannot be met due to the fact that the traditional method depends on low-efficiency and spot-inspection type off-line manual interpretation is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of zinc dross detection technology, specifically to an online detection device for zinc dross on the surface of hot-dip galvanized steel sheets. Background Technology

[0002] Under current technological conditions, online detection of zinc dross on the surface of hot-dip galvanized steel sheets mainly relies on machine vision technology, particularly the application of optical inspection equipment. These devices capture images of the steel sheet surface and analyze its brightness and texture features to identify surface defects such as zinc dross. However, this optical inspection method has some inherent limitations in practical applications. For example, it is easily affected by ambient light, surface reflections, oil, water stains, and other factors, which may be mistaken for defects, leading to a high false detection rate and poor stability of the detection results. Especially for tiny zinc dross or zinc dross with low contrast to the steel substrate, the recognition capability of optical inspection methods is significantly insufficient.

[0003] The aforementioned problems are particularly prominent when inspecting irregularly shaped galvanized sheets, such as automotive sheets with wavy bends or curved surfaces. The uneven surfaces of these irregularly shaped galvanized sheets make it impossible for fixed-mounted inspection probes to maintain a constant working distance and angle, resulting in blurred images, feature distortion, and in severe cases, even mechanical collisions due to excessively close proximity. Existing technologies lack online inspection solutions capable of adapting to the complex curved surfaces of irregularly shaped parts. This means that the quality inspection of such products still heavily relies on inefficient, sampling-based offline manual interpretation, failing to meet the stringent requirements of production lines for both efficiency and accuracy in full inspection. Therefore, improving the online detection technology for zinc dross on the surface of hot-dip galvanized steel sheets, especially for irregularly shaped galvanized sheets, is a pressing issue that needs to be addressed.

[0004] Therefore, this invention proposes an online detection device for zinc dross on the surface of hot-dip galvanized steel sheets. Summary of the Invention

[0005] The purpose of this invention is to provide an online detection device for zinc dross on the surface of hot-dip galvanized steel sheets, thereby solving the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: an online detection device for zinc dross on the surface of hot-dip galvanized steel sheets, comprising a base, a fixed seat above the base, a fixed plate on the side of the fixed seat, and a pair of crossbars on the side of the fixed plate. Both crossbars are fixedly connected to the fixed plate via a connecting frame, and the two crossbars are located directly above and below the zinc sheet, respectively; and a detection unit located at the bottom of the crossbars, used for online detection of zinc dross on the curved surfaces of the upper and lower sides of the zinc sheet.

[0006] Preferably, the detection unit includes multiple detection heads located at the bottom of the crossbar. The detection heads are divided into two groups, located directly above the recess and protrusion of the zinc plate, respectively. The bottom ends of the two groups of detection heads are equidistant from the surface of the zinc plate.

[0007] Preferably, a connecting block is provided above the detection head, and a connecting shaft is provided inside the connecting block. The connecting shaft passes through the inside of the crossbar and is rotatably connected to the fixing plate. A fixing shaft is provided on the side of the fixing plate. The fixing shaft and the connecting shaft are mutually driven by a transmission wheel. A flat gear is provided on the outer wall of the fixing shaft. An intermittent gear meshes with the flat gear on the side. A motor is provided on the side of the fixing plate. The rotating shaft of the motor is embedded in the intermittent gear and drives it to rotate.

[0008] Preferably, a torsion spring is provided between the spur gear and the fixed shaft. Under normal conditions, the elastic force of the torsion spring drives the connecting block to rotate until the outer wall of the detection head abuts against the groove of the crossbar.

[0009] Preferably, the detection head is slidably connected to the connecting block, an arc-shaped frame is provided above the detection head, a slide rod is provided inside the arc-shaped frame, and a baffle plate one and a baffle plate two are provided on the outer wall of the slide rod. The sides of the baffle plate one and the baffle plate two abut against the two sides of the arc-shaped frame. An electric push rod is provided at the end of the slide rod, and the electric push rod and the motor are electrically connected to the external control box.

[0010] Preferably, a liquid injection box is provided above the crossbar, and a liquid injection cylinder connected to the liquid injection box is provided on the side of the detection head. The liquid injection cylinder is fixedly connected to the detection head through a connecting frame. The wall of the liquid injection cylinder has multiple through holes, and the inside of the liquid injection cylinder has fan blades that block the through holes. The end of the fan blades has a connecting piece, and a magnet is provided above the connecting piece. An electromagnet is provided on the side of the magnet. A baffle is provided on the outer wall of the liquid injection cylinder. When the electromagnet is energized, it generates a magnetic force that attracts the magnet. When the electromagnet is energized in the opposite direction, it generates a repulsive force that repels the magnet. Both the electromagnet and the detection head are electrically connected to an external control box.

[0011] Preferably, a specific threshold is set inside the detection head. When the detection head detects that the concentration of zinc dross on the zinc plate surface exceeds the preset threshold, the electromagnet will be energized in the reverse direction, thereby driving the fan blade to rotate so that it no longer blocks the through hole.

[0012] Preferably, the fixing plate is divided into an upper plate, a middle plate and a lower plate. The upper plate and the lower plate are slidably connected to the middle plate in a vertical state. The side of the upper plate is provided with a first top rod, the bottom of which is fixedly connected to the fixing seat. The bottom of the injection box located below the zinc plate is provided with a second top rod, the bottom of which is fixedly connected to the base.

[0013] This invention has at least the following beneficial effects: 1. In this invention, by setting up an adaptive detection unit for the curved surface of irregularly shaped galvanized sheets, and using XRF detection heads arranged in groups above the concave and convex positions of the zinc sheet while maintaining equidistant detection, the problem of traditional reliance on inefficient, sampling-based offline manual interpretation, which cannot meet the production line's requirements for full inspection efficiency and accuracy, is effectively solved. The detection head is rotatably connected to the crossbar via a connecting block, and with the intermittent gear and spur gear transmission structure, the detection head achieves periodic oscillation during the detection process, expanding the coverage area of ​​a single detection and improving the coverage area and accuracy of zinc sheet surface detection.

[0014] 2. In this invention, when the zinc slag concentration is detected to be excessive, if the zinc slag concentration on the zinc plate is higher than the normal value but not higher than the highest point of the threshold, the pump connected to the injection cylinder will discharge high-pressure ink from the central through hole to mark the defective area. When the zinc slag concentration exceeds the preset threshold, the external control box will control the electromagnet to be energized in reverse. The electromagnet generates a repulsive force that repels the magnet, pushing the magnet to rotate until it contacts the baffle, thereby driving the fan blade to rotate so that the fan blade no longer blocks the through hole. High-pressure ink is sprayed from multiple through holes to form a circular mark, reminding the staff to pay attention to this area and carry out timely maintenance. The specific threshold set inside the detection head and the design of the injection cylinder and fan blades enable the device to make spot markings or circular markings according to different zinc slag concentrations, providing the staff with intuitive maintenance instructions and improving maintenance efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure and working scenario of the present invention; Figure 2 This is a cross-sectional view of the crossbar structure in this invention; Figure 3 For the present invention Figure 2 Enlarged view of the structure of region A in the middle; Figure 4 For the present invention Figure 2 Enlarged view of the structure of region B in the middle; Figure 5 This is a schematic diagram of the injection cylinder and its accessories in this invention; Figure 6 This is a partial view of the internal structure of the injection cylinder in this invention; Figure 7 This is a cross-sectional view of the injection cylinder structure in this invention.

[0016] In the diagram: 1-Base; 2-Fixed seat; 3-Fixed plate; 4-Crossbar; 5-Detection head; 6-Connecting block; 7-Connecting shaft; 8-Fixed shaft; 9-Side gear; 10-Intermittent gear; 11-Motor; 12-Arc frame; 13-Slide rod; 14-Baffle plate one; 15-Baffle plate two; 16-Electric push rod; 17-Injection box; 18-Injection cylinder; 19-Through hole; 20-Fan blade; 21-Connecting piece; 22-Magnet; 23-Electromagnet; 24-Baffle bar; 25-Upper plate; 26-Middle plate; 27-Lower plate; 28-Top rod one; 29-Top rod two. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1-7 This invention provides a technical solution: an online detection device for zinc dross on the surface of hot-dip galvanized steel sheets. Example 1 The system includes a base 1, with a fixed seat 2 on top of the base 1 and fixedly connected thereto. A fixed plate 3 is located on the side of the fixed seat 2, and the side of the fixed plate 3 is fixedly connected to the fixed seat 2. A pair of crossbars 4 are located on the side of the fixed plate 3, and both crossbars 4 are fixedly connected to the upper and lower ends of the fixed plate 3 through connecting brackets. The two crossbars 4 are located directly above and below the zinc plate, respectively. A detection unit is located at the bottom of the crossbars 4 and is used for online detection of zinc dross on the curved surfaces of the upper and lower sides of the zinc plate. The detection unit includes multiple equally spaced detection heads 5 located at the bottom of the crossbars 4. The detection heads 5 are XRF detection heads 5, which can be used for rapid detection of zinc dross on the surface of the zinc plate. The detection heads 5 are divided into two groups of different lengths and are located directly above the concave and protruding parts of the zinc plate, respectively. The bottom ends of the two groups of detection heads 5 are equidistant from the surface of the zinc plate, which is conducive to uniform and accurate detection of the surface of the zinc plate with different degrees of curvature and avoids deviation in detection results due to distance differences.

[0019] Furthermore, a connecting block 6 is provided above the detection head 5, and the detection head 5 is slidably connected to the connecting block 6. A connecting shaft 7 is provided inside the connecting block 6 and is fixedly connected to it. Both ends of the connecting shaft 7 are rotatably connected to the crossbar 4. The connecting shaft 7 passes through the interior of the crossbar 4 and is rotatably connected to the fixing plate 3. A fixing shaft 8 is provided on the side of the fixing plate 3 and is rotatably connected to it. The fixing shaft 8 and the connecting shaft 7 are mutually driven by a transmission wheel. A spur gear 9 is provided on the outer wall of the fixing shaft 8 and is fixedly connected to it. An intermittent gear 10 meshes with the spur gear 9 on its side. A motor 11 is provided on the side of the fixing plate 3. The bottom of the motor 11 is connected to the fixing plate 3. The fixed seat 2 is fixedly connected. The rotating shaft of the motor 11 is embedded in the intermittent gear 10 and drives it to rotate. A torsion spring is provided between the spur gear 9 and the fixed shaft 8. The two ends of the torsion spring are fixedly connected to the spur gear 9 and the fixed shaft 8 respectively. Under normal conditions, the elastic force of the torsion spring drives the connecting block 6 to rotate until the outer wall of the detection head 5 abuts against the slot of the crossbar 4. When the intermittent gear 10 is meshing with the spur gear 9, it can drive the outer wall of the detection head 5 to abut against the other side of the slot of the crossbar 4 through the connecting shaft 7. After the intermittent gear 10 fails to mesh with the spur gear 9, the elastic force of the torsion spring will drive the detection head 5 to reset.

[0020] In addition, an arc-shaped frame 12 is provided above the detection head 5. The bottom end of the arc-shaped frame 12 is fixedly connected to the detection head 5. A slide rod 13 is provided inside the arc-shaped frame 12. The arc direction of the internal slide groove of the arc-shaped frame 12 is the same as the rotation trend direction of the detection head 5. The slide rod 13 can slide freely inside the arc-shaped frame 12. The outer wall of the slide rod 13 is provided with a first baffle 14 and a second baffle 15, both of which are fixedly connected to it. The sides of the first baffle 14 and the second baffle 15 abut against the two sides of the arc-shaped frame 12. Therefore, the slide rod 13 can drive the arc-shaped frame 12 and the detection head 5 to make lateral displacement through the first baffle 14 and the second baffle 15. The end of the slide bar 13 is equipped with an electric push rod 16 and is fixedly connected to its top end. The bottom of the electric push rod 16 is fixedly connected to the inner wall of the crossbar 4. Both the electric push rod 16 and the motor 11 are electrically connected to the external control box. The pushing distance of the electric push rod 16 can be finely adjusted according to the curvature of the zinc plate to be tested, which increases the applicability of this device. When the motor 11 is started, the electric push rod 16 starts automatically and drives multiple detection heads 5 to make a lateral displacement of a preset distance through the connecting shaft 7, so that the detection heads 5 can better fit the curvature of the zinc plate surface, thereby performing more accurate zinc dross detection.

[0021] Furthermore, an injection box 17 is provided above the crossbar 4 and is fixedly connected to it. An injection cylinder 18 connected to the injection box 17 is provided on the side of the detection head 5. The injection cylinder 18 is fixedly connected to the detection head 5 through a connecting frame. The wall of the injection cylinder 18 is provided with multiple through holes 19. The inside of the injection cylinder 18 is provided with a fan blade 20 that blocks the through holes 19. The fan blade 20 is rotatably connected to the injection cylinder 18. The end of the fan blade 20 is provided with a connecting piece 21 and is fixedly connected to it. A magnet 22 is provided above the connecting piece 21 and is fixedly connected to it. An electromagnet 23 is provided on the side of the magnet 22. The side of the electromagnet 23 is fixedly connected to the outer wall of the injection cylinder 18. A baffle 24 is provided on the outer wall of the injection cylinder 18 and is fixedly connected to it. When energized, electromagnet 23 generates a magnetic force that attracts magnet 22. When energized in the reverse direction, electromagnet 23 generates a repulsive force that repels magnet 22. This repulsive force will push magnet 22 to rotate until it comes into contact with stop bar 24. Electromagnet 23 and detection head 5 are both electrically connected to external control box.

[0022] The detection head 5 has a specific threshold set inside. During the detection process, if the zinc dross concentration on the zinc plate is higher than the normal value but not higher than the highest point of the threshold, the pump connected to the injection cylinder 18 will discharge high-pressure ink from the central through hole 19 to mark the defective area. When the detection head 5 detects that the zinc dross concentration on the surface of the zinc plate exceeds the preset threshold, the electromagnet 23 will be reverse-energized, thereby using repulsive force to drive the fan blade 20 to rotate, causing the magnet 22 to rotate until it contacts the baffle 24, so that the fan blade 20 no longer blocks the through hole 19, and then the high-pressure ink is sprayed out from multiple through holes 19 to form a ring mark to remind the staff to pay attention to this area and carry out timely maintenance.

[0023] The working principle of online zinc dross detection: When the hot-dip galvanized sheet moves to the inspection area along the production line, the external control box starts the motor 11. The motor 11 drives the intermittent gear 10 to rotate. The intermittent gear 10 meshes with the spur gear 9, which in turn drives the inspection head 5 to rotate at a certain angle through the connecting shaft 7. When the meshing transmission between the intermittent gear 10 and the spur gear 9 fails, the spring force of the torsion spring will reset the inspection head 5. Then, the intermittent gear 10 will mesh with the spur gear 9 below, so that the inspection unit under the arc-shaped zinc sheet can work. Throughout the process, the inspection head 5 is always in the inspection open state. Through the continuous rotation of the intermittent gear 10, the periodic reciprocating rotation of multiple inspection heads 5 is realized, which expands the inspection area of ​​the inspection head 5 and improves the inspection accuracy.

[0024] Meanwhile, the electric push rod 16 is finely adjusted according to the curvature of the zinc plate. When the detection head 5 reciprocates, it pushes the slide rod 13 to slide within the arc frame 12. The slide rod 13 drives the detection head 5 to make lateral displacement through the first baffle 14 and the second baffle 15, which changes the original single rotation trajectory of the detection head 5 and realizes a similar "elliptical" X-ray inspection, which matches the curved area of ​​the arc zinc plate, further improving the coverage area and accuracy of the zinc plate surface inspection.

[0025] Furthermore, during the testing process, if the zinc dross concentration on the zinc plate is higher than the normal value but not higher than the highest point of the threshold, the pump connected to the injection cylinder 18 will discharge high-pressure ink from the central through hole 19 to mark the defective area. When the detection head 5 detects that the zinc dross concentration on the zinc plate surface exceeds the preset threshold, the external control box will control the electromagnet 23 to be energized in reverse. The electromagnet 23 generates a repulsive force that repels the magnet 22, pushing the magnet 22 to rotate until it contacts the baffle 24, thereby driving the fan blade 20 to rotate. This prevents the fan blade 20 from blocking the through hole 19, and high-pressure ink is sprayed from multiple through holes 19 to form a ring-shaped mark, reminding the staff to pay attention to this area and carry out timely repairs.

[0026] Compared to existing technologies, this online zinc dross detection device for hot-dip galvanized steel sheets has significant advantages. Firstly, the intermittent meshing of gear 10 and spur gear 9, along with the spring-loaded reset action of the torsion spring, enables the periodic reciprocating rotation of the detection head 5, effectively expanding the detection area and improving accuracy. Secondly, the electric push rod 16 finely adjusts according to the curvature of the zinc sheet, pushing the slide rod 13 to slide within the arc-shaped frame 12, thereby causing the detection head 5 to shift laterally. This transforms the detection trajectory from a single rotation to a near-elliptical ray inspection, better conforming to the curved area of ​​the zinc sheet and further enhancing the detection coverage and accuracy. Finally, the specific threshold set inside the detection head 5, along with the design of the injection cylinder 18 and fan blades 20, allows the device to perform point marking or circular marking based on different zinc dross concentrations, providing workers with intuitive maintenance instructions and improving maintenance efficiency. In conclusion, this device effectively solves the problems of low accuracy and low efficiency in the detection of irregularly shaped galvanized steel sheets in existing technologies, possessing high practical value and promising prospects for widespread application.

[0027] Based on the above embodiments, Embodiment Two The fixed plate 3 is divided into an upper plate 25, a middle plate 26, and a lower plate 27. The upper plate 25 and the lower plate 27 are slidably connected to the middle plate 26 in a vertical state. The upper plate 25 has a first top rod 28 on its side and is fixedly connected to it. The bottom of the first top rod 28 is fixedly connected to the fixed base 2. The bottom of the liquid injection box 17 located below the zinc plate has a second top rod 29 and is fixedly connected to it. The bottom of the second top rod 29 is fixedly connected to the base 1. The first top rod 28 and the second top rod 29 can be freely controlled by the operator to lift them, thereby allowing the detection units located above and below the arc-shaped zinc plate to move away from or closer to each other.

[0028] When inspecting curved zinc plates of different curvatures or specifications, operators can flexibly adjust the lifting distance of top rod 28 and top rod 29 according to the actual situation. This allows the upper plate 25 and lower plate 27 to slide up and down relative to the middle plate 26, thereby changing the distance between the inspection unit and the zinc plate surface. This ensures that the inspection head 5 is always in the optimal inspection position. Operators can replace the intermittent gear 10, which is compatible with the two flat gears 9, according to the final confirmed spacing, further improving the accuracy and stability of the inspection. This adjustable design allows the device to adapt to the inspection needs of more types and specifications of curved zinc plates, greatly enhancing the versatility and practicality of the device.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An online detection device for zinc dross on the surface of hot-dip galvanized sheet, characterized in that, include: The base (1) has a fixed seat (2) on top of it. The fixed seat (2) has a fixed plate (3) on its side. The fixed plate (3) has a pair of crossbars (4) on its side. Both crossbars (4) are fixedly connected to the fixed plate (3) through a connecting frame. The two crossbars (4) are located directly above and directly below the zinc plate, respectively. The detection unit is located at the bottom of the crossbar (4) and is used to perform online detection of zinc dross on the curved surfaces of the upper and lower sides of the zinc plate.

2. The online detection device for zinc dross on the surface of hot-dip galvanized sheet according to claim 1, characterized in that: The detection unit includes multiple detection heads (5) located at the bottom of the crossbar (4). The detection heads (5) are divided into two groups, located directly above the recess and protrusion of the zinc plate, respectively. The bottom ends of the two groups of detection heads (5) are equidistant from the surface of the zinc plate.

3. The online detection device for zinc dross on the surface of hot-dip galvanized sheet according to claim 2, characterized in that: A connecting block (6) is provided above the detection head (5). A connecting shaft (7) is provided inside the connecting block (6). The connecting shaft (7) passes through the inside of the crossbar (4) and is rotatably connected to the fixing plate (3). A fixing shaft (8) is provided on the side of the fixing plate (3). The fixing shaft (8) and the connecting shaft (7) are driven to each other by a transmission wheel. A flat gear (9) is provided on the outer wall of the fixing shaft (8). An intermittent gear (10) meshes with the flat gear (9) on the side. A motor (11) is provided on the side of the fixing plate (3). The rotating shaft of the motor (11) is embedded in the intermittent gear (10) and drives it to rotate.

4. The online detection device for zinc dross on the surface of hot-dip galvanized sheet according to claim 3, characterized in that: A torsion spring is provided between the spur gear (9) and the fixed shaft (8). Under normal conditions, the elastic force of the torsion spring drives the connecting block (6) to rotate until the outer wall of the detection head (5) abuts against the groove of the crossbar (4).

5. The online detection device for zinc dross on the surface of hot-dip galvanized sheet according to claim 4, characterized in that: The detection head (5) is slidably connected to the connecting block (6). An arc frame (12) is provided above the detection head (5). A slide rod (13) is provided inside the arc frame (12). A baffle plate one (14) and a baffle plate two (15) are provided on the outer wall of the slide rod (13). The sides of the baffle plate one (14) and the baffle plate two (15) abut against the sides of the arc frame (12). An electric push rod (16) is provided at the end of the slide rod (13). The electric push rod (16) and the motor (11) are electrically connected to the external control box.

6. The online detection device for zinc dross on the surface of hot-dip galvanized sheet according to claim 5, characterized in that: A liquid injection box (17) is provided above the crossbar (4). A liquid injection cylinder (18) connected to the liquid injection box (17) is provided on the side of the detection head (5). The liquid injection cylinder (18) is fixedly connected to the detection head (5) through a connecting frame. The wall of the liquid injection cylinder (18) is provided with multiple through holes (19). The inside of the liquid injection cylinder (18) is provided with a fan blade (20) that blocks the through holes (19). The end of the fan blade (20) is provided with a connecting piece (21). A magnet (22) is provided above the connecting piece (21). An electromagnet (23) is provided on the side of the magnet (22). A baffle (24) is provided on the outer wall of the liquid injection cylinder (18). When the electromagnet (23) is energized, it generates a magnetic force that attracts the magnet (22). When the electromagnet (23) is energized in the opposite direction, it generates a repulsive force that repels the magnet (22). The electromagnet (23) and the detection head (5) are both electrically connected to the external control box.

7. The online detection device for zinc dross on the surface of hot-dip galvanized sheet according to claim 6, characterized in that: The detection head (5) has a specific threshold set inside. When the detection head (5) detects that the zinc dross concentration on the zinc plate surface exceeds the preset threshold, the electromagnet (23) will reverse the current, thereby driving the fan blade (20) to rotate so that it no longer blocks the through hole (19).

8. The online detection device for zinc dross on the surface of hot-dip galvanized sheet according to claim 1, characterized in that: The fixing plate (3) is divided into an upper plate (25), a middle plate (26) and a lower plate (27). The upper plate (25) and the lower plate (27) are slidably connected to the middle plate (26) in a vertical state. The side of the upper plate (25) is provided with a top rod (28). The bottom of the top rod (28) is fixedly connected to the fixing seat (2). The bottom of the liquid injection box (17) located below the zinc plate is provided with a top rod (29). The bottom of the top rod (29) is fixedly connected to the base (1).

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