A device for detecting the thickness of anti-corrosion coating on propellers of ships

Abstract

The present invention relates to the technical field of detection devices, and in particular to a device for detecting the thickness of an anti-corrosion coating on a propeller of a ship, comprising a detection unit for detecting the surface coating of a blade on a propeller, wherein the detection unit comprises two relatively distributed arched base frames, each of which is provided with a magnetic strip and a magnetic field detector, the two magnetic strips on the two arched base frames are mutually attracted by magnetic force, the two magnetic strips are parallel, and the magnetic field detector can move along the length direction of the magnetic strip; the detection device can be applied to the detection of coatings on non-ferromagnetic substrates, and solves the problem that a traditional magnetic induction instrument can only detect ferromagnetic substrates; through the two relatively distributed magnetic strips and the two magnetic field detectors, the upper and lower surfaces of the blades can be detected simultaneously, and the detection efficiency and accuracy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of detection devices, and in particular to a device for detecting the thickness of an anti-corrosion coating on a propeller of a ship. Background Art

[0002] The ship propeller is one of the core components of the ship propulsion system, and its performance directly affects the navigation efficiency and safety of the ship. The propeller is in the seawater environment for a long time and is susceptible to corrosion from seawater salinity, microbial erosion and other chemical substances, which leads to the gradual degradation of the propeller surface material. The corrosion will not only affect the balance and propulsion efficiency of the propeller, but may also cause serious safety problems, such as propeller blade breakage.

[0003] In order to extend the service life of the propeller and reduce maintenance costs, an anti-corrosion coating is usually applied to the propeller surface. The anti-corrosion coating can effectively isolate the direct contact between seawater and the propeller material, thereby preventing corrosion. However, the uniformity of the coating thickness and sufficient coverage are important factors to ensure the long-term effectiveness of the coating. If the coating is too thin, the protective effect is poor; if the coating is too thick, it may cause imbalance of the propeller, thereby affecting the navigation performance of the ship.

[0004] At present, the main method for detecting propeller coating thickness is to use a magnetic induction meter. Traditional magnetic induction meters are mainly used to measure non-magnetic coatings on ferromagnetic materials. They are greatly affected by the characteristics of the substrate (such as magnetic permeability and thickness), so their detection limitations are relatively large. Summary of the invention

[0005] In view of at least one of the above technical problems, the present invention provides a device for detecting the thickness of an anti-corrosion coating on a ship propeller, and the specific technical solution adopted is:

[0006] According to a first aspect of the present invention, there is provided a device for detecting the thickness of an anti-corrosion coating on a propeller of a ship, comprising:

[0007] A detection unit is used to detect the surface coating of the blades on the propeller, the detection unit comprises two relatively distributed arched bases, each arched base is provided with a magnetic strip and a magnetic field detector, the two magnetic strips on the two arched bases are mutually attracted by magnetic force, the two magnetic strips are parallel, and the magnetic field detector can move along the length direction of the magnetic strip;

[0008] A magnetic field with parallel magnetic lines of force is formed between the two magnetic strips, and two magnetic field detectors are located between the two magnetic strips and are used to simultaneously detect the coatings on both sides of the propeller blades.

[0009] In some embodiments of the present invention, a first threaded rod is rotatably provided on the arched base, the first threaded rod is parallel to the magnetic strip, a slider is threadedly mounted on the first threaded rod, the slider is slidably installed on the arched base, a connecting frame is provided on the slider, and the magnetic field detector is fixed on the connecting frame.

[0010] In some embodiments of the present invention, a rib is fixed to the end of the connecting frame, and the rib is connected to the sliding block via a spring sheet.

[0011] In some embodiments of the present invention, the detection device also includes an outer cylinder, the two arched base frames are both arranged on the outer cylinder, each first threaded rod is transmission-equipped with a worm wheel, the worm wheel is meshed with a worm, the two worms are butt-jointed, and the outer cylinder is provided with a first motor for providing power to the worm.

[0012] In some embodiments of the present invention, the arched base moves on the outer cylinder along a direction of a vertical line between two arched bases, and an adjustment structure is provided on the outer cylinder, and the adjustment structure is used to adjust the distance between the two arched bases.

[0013] In some embodiments of the present invention, the adjustment structure includes a notch opened on the side wall of the outer cylinder, and a first adjustment block and a second adjustment block are slidably arranged in the notch. The first adjustment block and the second adjustment block are connected by a fastening bolt. Two push-pull arms are relatively inclined on the first adjustment block, and the two push-pull arms are respectively rotatably connected to the two bow-shaped bases.

[0014] In some embodiments of the present invention, the outer cylinder is in the shape of a square;

[0015] The detection device also includes a base plate, on which a second motor, a transmission wheel and a transmission disk are arranged. The transmission wheel and the transmission disk are both rotatably mounted on the base plate, and the transmission wheel and the transmission disk are transmission-connected to each other. The second motor provides rotational power for the transmission wheel. Four corner beams are arranged on the end surface of the transmission disk, and the four corner beams correspond to the four inner corners of the outer cylinder respectively. The outer cylinder is slidingly sleeved on the four corner beams.

[0016] In some embodiments of the present invention, a second threaded rod is arranged in parallel between the four angle beams, the second threaded rod is rotatably mounted on the transmission disk, an adjustment plate is inserted into the second threaded rod, and the adjustment plate is threadedly connected to the second threaded rod, the adjustment plate is fixedly connected to the outer cylinder, a third motor for providing power for the rotation of the second threaded rod is arranged on the base plate, a cross is connected between the four angle beams, and the end of the second threaded rod is rotatably mounted on the cross.

[0017] The beneficial effects of the present invention are:

[0018] The detection device can be applied to coating detection on non-ferromagnetic substrates, solving the problem that traditional magnetic induction instruments can only detect ferromagnetic substrates; through two relatively distributed magnetic strips and two magnetic field detectors, the upper and lower surfaces of the blades can be detected simultaneously, improving detection efficiency and accuracy; the parallel and stable magnetic field generated between the two magnetic strips is less affected by external factors and can provide a stable detection environment; the magnetic field detector can move along the length direction of the magnetic strip, and can more comprehensively detect the blades on the propeller; in summary, the detection device solves the limitations of traditional magnetic induction instruments in detecting the coating thickness on non-ferromagnetic substrates, improves the applicability, stability and accuracy of the detection, and improves the applicability and increases the detection range. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 yes Figure 1 An enlarged schematic diagram of the detection unit and the structure thereon;

[0022] Figure 3 is a schematic structural diagram of a detection unit in an embodiment of the present invention;

[0023] Figure 4 yes Figure 3 A schematic diagram of the structure of the middle arch-shaped base frame in a cross-sectional enlarged view;

[0024] Figure 5 2 is a schematic diagram of the structure of the outer cylinder in an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the structure of the substrate in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. This embodiment is written in a progressive manner.

[0029] like Figures 1 to 4 As shown, a device for detecting the thickness of an anti-corrosion coating on a propeller of a ship of the present invention comprises:

[0030] The detection unit 1 is used to detect the surface coating of the blades on the propeller 2. The detection unit 1 includes two relatively distributed arched base frames 3. Each arched base frame 3 is provided with a magnetic strip 4 and a magnetic field detector 5. The two magnetic strips 4 on the two arched base frames 3 are attracted to each other by magnetic force. The two magnetic strips 4 are parallel, and the magnetic field detector 5 can move along the length direction of the magnetic strip 4.

[0031] A magnetic field with parallel magnetic lines of force is formed between the two magnetic strips 4 , and two magnetic field detectors 5 are located between the two magnetic strips 4 and are used to simultaneously detect the coatings on both sides of the blades of the propeller 2 .

[0032] In the above embodiment, the directions of the two arched bases 3 on the detection unit 1 can be adjusted according to the arc direction, spiral direction or curvature of the blades on the propeller 2. The two arched bases 3 are respectively located on the upper and lower sides of the blades on the propeller 2. In this way, the two magnetic field detectors 5 on the two arched bases 3 can be used to detect the coating thickness on the upper and lower surfaces of the blades. The two magnetic strips 4 are parallel and attract each other. A parallel and stable magnetic field will be generated between the two magnetic strips 4. The magnetic field is less affected by external factors. Therefore, the stable magnetic field can be used to effectively detect the blades on the propeller 2. The magnetic field detector 5 can adopt a Hall effect sensor, a magnetoresistor, a giant magnetoresistive sensor, etc.

[0033] Based on the above embodiment, when inspecting the blades of the propeller 2, two arched bases 3 are placed on the upper and lower sides of the blades, and the direction of the arched bases 3 needs to be parallel to or close to the direction of the blade cross section intercepted by the vertical plane where the two arched bases 3 are located on the blade. A stable magnetic field is generated between the two magnetic strips 4 on the two arched bases 3, and the magnetic field passes through the blades. Due to the obstruction of the coating on the blades, the coating will increase the magnetic resistance of the magnetic circuit, resulting in a weakening of the magnetic field passing through the coating and the blades. The thicker the coating, the greater the magnetic resistance, and the greater the degree of magnetic field weakening. At this time, a magnetic field detector 5 is used to detect changes in the magnetic field. The presence of the coating will cause the magnetic field strength to change. The thickness of the coating can be inferred by detecting these changes. Since the magnetic field detector 5 can move along the length direction of the magnetic strip 4, it is convenient to detect the thickness of the coating at different positions on the blade. In actual measurement, in order to improve the measurement accuracy, the magnetic field detector 5 can be made to contact the surface of the blade coating.

[0034] It should be pointed out that before detection, it is necessary to pass the magnetic field through the uncoated blades so that the magnetic field detector 5 measures a reference value, that is, to perform a calibration operation, and then compare it with the measured value of the coated blades to calculate the coating thickness. The specific calculation method requires the use of a pre-established standard curve or mathematical model to convert the change in magnetic field intensity into coating thickness. The standard curve is usually obtained through calibration, that is, a standard block of known thickness is used to determine the relationship between the change in magnetic field intensity and coating thickness, and an appropriate algorithm can be used to process the detected magnetic field data. Common algorithms include linear regression or other models to ensure that the coating thickness can be accurately calculated. The axis of the propeller 2 is vertical, and the propeller 2 is fixed to an external clamping structure or a workbench.

[0035] The detection device can be applied to coating detection on non-ferromagnetic substrates, solving the problem that traditional magnetic induction instruments can only detect ferromagnetic substrates; through two relatively distributed magnetic strips 4 and two magnetic field detectors 5, the upper and lower surfaces of the blades can be detected simultaneously, thereby improving detection efficiency and accuracy; the parallel and stable magnetic field generated between the two magnetic strips 4 is less affected by external factors and can provide a stable detection environment; the magnetic field detector 5 can move along the length direction of the magnetic strip 4, thereby more comprehensively detecting the blades on the propeller 2; in summary, the detection device solves the limitations of traditional magnetic induction instruments in detecting coating thickness on non-ferromagnetic substrates, improves the applicability, stability and accuracy of detection, and improves applicability and increases the detection range.

[0036] In some embodiments of the present invention, Figure 4As shown, a first threaded rod 6 is rotatably provided on the arched base 3, the first threaded rod 6 is parallel to the magnetic strip 4, a slider 7 is threadedly provided on the first threaded rod 6, the slider 7 is slidably installed on the arched base 3, a connecting frame 8 is provided on the slider 7, and the magnetic field detector 5 is fixed on the connecting frame 8.

[0037] In the above embodiment, the slider 7 can be moved along the length direction of the magnetic strip 4 by rotating the first threaded rod 6, so that the slider 7 drives the magnetic field detector 5 to move through the connecting frame 8, thereby facilitating the adjustment of the position of the magnetic field detector 5.

[0038] In some embodiments of the present invention, Figure 4 As shown, a rib 9 is fixed to the end of the connecting frame 8 , and the rib 9 is connected to the slide block 7 via a spring sheet 10 .

[0039] In the above embodiment, the spring clip 10 can provide an elastic thrust for the connecting frame 8, so that the magnetic field detector 5 can contact the surface of the blade. When the slider 7 moves along the length direction of the magnetic strip 4, the magnetic field detector 5 can slide on the blade. Since the shape of the blade is irregular, it is necessary to utilize the sliding of the connecting frame 8 on the slider 7 and the elastic thrust of the spring clip 10 so that the magnetic field detector 5 can always contact the surface of the blade, thereby facilitating the detection of irregularly shaped blades.

[0040] It should be pointed out that in order to avoid friction damage between the magnetic field detector 5 and the blades, auxiliary structures such as transparent slide plates and balls can be provided on the magnetic field detector 5 to reduce friction and protect the blades and the magnetic field detector 5.

[0041] In some embodiments of the present invention, Figure 2 As shown, the detection device also includes an outer cylinder 11, two arched base frames 3 are arranged on the outer cylinder 11, each first threaded rod 6 is transmission-arranged with a worm wheel 12, a worm 13 is meshed on the worm wheel 12, and the two worms 13 are butt-jointed, and a first motor 14 for providing power to the worm 13 is arranged on the outer cylinder 11.

[0042] In the above embodiment, the thread directions on the two worm gears 13 can be the same or opposite, the outer cylinder 11 can provide support for the two arched base frames 3, and the first motor 14 can drive the two worm wheels 12 to rotate through the two worm gears 13, thereby driving the two first threaded rods 6 to rotate, which is convenient for providing power for the magnetic field detector 5 to move along the length direction of the magnetic strip 4.

[0043] In some embodiments of the present invention, the arched base 3 moves on the outer cylinder 11 along the vertical line between the two arched bases 3 , and an adjustment structure is provided on the outer cylinder 11 , and the adjustment structure is used to adjust the distance between the two arched bases 3 .

[0044] In the above embodiment, the bow-shaped base 3 can slide on the outer cylinder 11, and the sliding direction of the bow-shaped base 3 is along the direction of the vertical line between the two bow-shaped bases 3, that is, the distance between the two bow-shaped bases 3 is adjustable. In this way, the distance between the two magnetic strips 4 can be adjusted, so as to facilitate the adjustment of the magnetic field strength and adapt to a wider detection range of coating thickness or blade thickness.

[0045] In some embodiments of the present invention, Figure 5 As shown, the adjustment structure includes a notch 15 opened on the side wall of the outer cylinder 11, and a first adjustment block 16 and a second adjustment block 17 are slidably arranged in the notch 15. The first adjustment block 16 and the second adjustment block 17 are connected by a fastening bolt 18. Two push-pull arms 19 are relatively inclined on the first adjustment block 16, and the two push-pull arms 19 are rotatably connected to the two bow-shaped base frames 3 respectively.

[0046] In the above embodiment, the directions of the two push-pull arms 19 on the first adjustment block 16 are opposite, and the push-pull arms 19 are inclined on the first adjustment block 16. When the first adjustment block 16 approaches or moves away from the bow-shaped base 3, the first adjustment block 16 can push the two bow-shaped bases 3 to separate or pull the two bow-shaped bases 3 closer through the two push-pull arms 19, thereby facilitating the adjustment of the distance between the two bow-shaped bases 3. The setting of the second adjustment block 17 and the fastening bolts 18 can facilitate the locking of the position of the first adjustment block 16 and facilitate workers to adjust the position of the first adjustment block 16.

[0047] In actual use, two groups of adjustment structures can be provided to facilitate adjustment of the front and rear sides of the arched base frame 3.

[0048] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the outer cylinder 11 is in a square shape;

[0049] The detection device also includes a substrate 20, on which a second motor 21, a transmission wheel 22 and a transmission disk 23 are arranged. The transmission wheel 22 and the transmission disk 23 are both rotatably mounted on the substrate 20, and the transmission wheel 22 and the transmission disk 23 are transmission-connected to each other. The second motor 21 provides rotational power for the transmission wheel 22. Four corner beams 24 are arranged on the end surface of the transmission disk 23. The four corner beams 24 correspond to the four inner corners of the outer cylinder 11 respectively, and the outer cylinder 11 is slidably sleeved on the four corner beams 24.

[0050] In the above embodiment, the base plate 20 can provide support for the structure thereon. Since the shape of the blades on the propeller 2 is irregular, when measuring different points on the propeller 2, it is necessary to adjust the direction of the two magnetic strips 4 and the distance between the two magnetic strips 4 and the axis of the propeller 2. Here, the second motor 21 can be operated to rotate the transmission wheel 22 and the transmission plate 23, thereby driving the direction of rotation of the outer cylinder 11 through the four angle beams 24 to adjust the direction of the two magnetic strips 4, and the distance between the magnetic strips 4 and the axis of the propeller 2 can be adjusted by pushing the outer cylinder 11 to slide on the four angle beams 24.

[0051] In some embodiments of the present invention, Figure 6 As shown, a second threaded rod 25 is arranged in parallel between the four angle beams 24, and the second threaded rod 25 is rotatably mounted on the transmission disk 23. An adjustment plate 26 is inserted into the second threaded rod 25, and the adjustment plate 26 is threadedly connected to the second threaded rod 25. The adjustment plate 26 is fixedly connected to the outer cylinder 11, and a third motor 27 for providing power for the rotation of the second threaded rod 25 is arranged on the base plate 20. A cross 28 is connected between the four angle beams 24, and the end of the second threaded rod 25 is rotatably mounted on the cross 28.

[0052] In the above embodiment, the output end of the third motor 27 passes through the base plate 20 and the transmission disk 23 and is transmission-connected to the second threaded rod 25. When the third motor 27 drives the second threaded rod 25 to rotate, since the second threaded rod 25 is threadedly connected to the adjustment plate 26, the adjustment plate 26 pushes the outer cylinder 11 to move, thereby providing moving power for the outer cylinder 11. The setting of the cross 28 can help the four corner beams 24 and the second threaded rod 25 to be connected and fixed.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for detecting the thickness of a ship propeller anti-corrosion coating, characterized in that: include: A detection unit is used to detect the surface coating of the blades on the propeller, the detection unit comprises two relatively distributed arched bases, each arched base is provided with a magnetic strip and a magnetic field detector, the two magnetic strips on the two arched bases are mutually attracted by magnetic force, the two magnetic strips are parallel, and the magnetic field detector can move along the length direction of the magnetic strip; A magnetic field with parallel magnetic lines of force is formed between the two magnetic strips, and two magnetic field detectors are located between the two magnetic strips and are used to simultaneously detect the coatings on both sides of the propeller blades.

2. A device for detecting the thickness of a ship propeller anti-corrosion coating according to claim 1, characterized in that: A first threaded rod is rotatably provided on the arched base frame, the first threaded rod is parallel to the magnetic strip, a slider is threadedly provided on the first threaded rod, the slider is slidably installed on the arched base frame, a connecting frame is provided on the slider, and the magnetic field detector is fixed on the connecting frame.

3. A device for detecting the thickness of a ship propeller anti-corrosion coating according to claim 2, characterized in that: A rib is fixed to the end of the connecting frame, and the rib is connected to the sliding block via a spring sheet.

4. A device for detecting the thickness of a ship propeller anti-corrosion coating according to claim 3, characterized in that: The detection device also includes an outer cylinder, two arched base frames are arranged on the outer cylinder, each first threaded rod is transmission-arranged with a worm wheel, a worm is meshed on the worm wheel, and two worms are butt-jointed, and a first motor for providing power to the worm is arranged on the outer cylinder.

5. A device for detecting the thickness of a ship propeller anti-corrosion coating according to claim 4, characterized in that: The arched base frame moves on the outer cylinder along the direction of the vertical line between the two arched base frames. The outer cylinder is provided with an adjustment structure, and the adjustment structure is used to adjust the distance between the two arched base frames.

6. A device for detecting the thickness of a ship propeller anti-corrosion coating according to claim 5, characterized in that: The adjustment structure includes a notch opened on the side wall of the outer cylinder, and a first adjustment block and a second adjustment block are slidably arranged in the notch. The first adjustment block and the second adjustment block are connected by fastening bolts. Two push-pull arms are relatively inclined on the first adjustment block, and the two push-pull arms are respectively rotatably connected to the two bow-shaped base frames.

7. A device for detecting the thickness of a ship propeller anti-corrosion coating according to claim 6, characterized in that: The outer cylinder is in a square shape; The detection device also includes a base plate, on which a second motor, a transmission wheel and a transmission disk are arranged. The transmission wheel and the transmission disk are both rotatably mounted on the base plate, and the transmission wheel and the transmission disk are transmission-connected to each other. The second motor provides rotational power for the transmission wheel. Four corner beams are arranged on the end surface of the transmission disk, and the four corner beams correspond to the four inner corners of the outer cylinder respectively. The outer cylinder is slidingly sleeved on the four corner beams.

8. A device for detecting the thickness of a ship propeller anti-corrosion coating according to claim 7, characterized in that: A second threaded rod is arranged in parallel between the four angle beams, the second threaded rod is rotatably mounted on the transmission plate, an adjustment plate is inserted into the second threaded rod, and the adjustment plate is threadedly connected to the second threaded rod, the adjustment plate is fixedly connected to the outer cylinder, a third motor for providing power for the rotation of the second threaded rod is arranged on the base plate, a cross is connected between the four angle beams, and the end of the second threaded rod is rotatably mounted on the cross.

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