An automatic draft measurement device for port vessels

Abstract

This invention relates to ship auxiliary equipment, including a draft beam, a sensor cover, and a booster frame. The draft beam is composed of a first rod and a second rod hinged together. The sensor cover is fixedly mounted on the free end of the first rod, with an open bottom. The sensor cover houses a level sensor assembly and an angle sensor. The booster frame is fixedly mounted on the second rod and is used to secure the ship to the hull. The invention features a detachable detection tube connected below the sensor cover. When the sea is calm, the sensor can directly detect the height difference between the sea surface and the deck. When there are large waves, the detection tube can isolate the waves, improving detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of ship auxiliary equipment technology, specifically to an automatic draft measurement device for port vessels. Background Technology

[0002] Ballast water serves to maintain a certain draft when a ship is sailing unloaded, ensuring safe navigation and preventing accidents such as capsizing. At the same time, an appropriate amount of ballast water ensures sufficient draft for the propeller and can also adjust the ship's center of gravity by regulating its distribution, thus adapting the ship to the prevailing ocean conditions and ensuring stability and operational safety during navigation.

[0003] Currently, when ships dock at ports for loading, some ballast water needs to be released into the sea to meet loading requirements. Specifically, during cargo loading operations, workers need to observe the draft gauge to determine the ship's draft and center of gravity distribution to ensure that the ship is balanced and not overloaded or unevenly loaded after loading. In traditional technology, the draft gauge on the side of the ship near the shore can be observed directly from the dock; however, the draft gauge on the outer side of the ship is difficult to read because there is no foothold, so workers have to climb down a spiral ladder to read it, which is very cumbersome and poses certain safety hazards.

[0004] Existing technologies include intelligent draft gauges that automatically detect water level using sensors, a method that is efficient and convenient. However, since the sea surface is not flat but includes waves of varying amplitudes, the sensor data is reliable when the waves are small. But when the waves are large, the fluctuating sea surface around the ship causes the intelligent draft gauge data to fluctuate, making it difficult for staff to accurately determine the draft gauge readings. Therefore, we propose an automatic draft gauge measuring device for port vessels to effectively address these shortcomings. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic draft measurement device for port vessels, which solves the problems mentioned in the background art.

[0006] This invention is achieved through the following technical solution: an automatic draft measurement device for port vessels, comprising:

[0007] The water gauge main beam is composed of a first rod and a second rod that are hinged together.

[0008] A sensor cover is fixedly mounted on the free end of the first rod. The bottom end of the sensor cover is open. The sensor cover contains a liquid level sensor assembly and an angle sensor.

[0009] A height-adjusting frame, which is fixedly mounted on the second pole and is used to fix the height-adjusting frame to the hull;

[0010] A detection tube, one end of which is connected to the bottom of the sensor cover, and the other end of which is used to extend into the water;

[0011] The bottom of the detection tube is funnel-shaped, wider at the top and narrower at the bottom. A floating plug is movably installed inside the detection tube. A wave detection component is installed on the outer sleeve of the bottom of the detection tube. When the wave detection component is impacted by an external force, the floating plug can remain relatively fixed to the inner wall of the detection tube.

[0012] Optionally, the number of the riser frame is two, and the bottom of the riser frame is provided with a strong magnet mounting base, and the strong magnet mounting base is provided with a strong magnet.

[0013] Optionally, the second rod body has a controller and a battery inside, and a display screen is also provided on the upper surface of the second rod body. The signal output terminals of the liquid level sensor assembly and the angle sensor are both connected to the controller, and the signal output terminal of the controller is connected to the display screen.

[0014] Optionally, the detection tube includes an outer tube body, an inner tube body, and a rotating tube that are sequentially sleeved from the outside to the inside. The outer surface of the rotating tube is provided with an external thread, and the rotating tube and the inner tube body are threaded together. One end of the rotating tube extending outside the inner tube body is detachably connected to the bottom end of the sensor cover.

[0015] A support rod is provided on one side of the top of the outer tube, and an electromagnetic chuck is provided at the end of the support rod. The electromagnetic chuck is used to adhere to and fit against the side wall of the hull.

[0016] Optionally, the floating plug includes a rigid part and a foam block disposed on the bottom surface of the rigid part. The outer ring wall of the rigid part is provided with grooves on both opposite sides. The bottom inner wall of the detection tube is provided with a slide rail along the axial direction. The slide rail slides in cooperation with the corresponding groove.

[0017] Optionally, the inner ends of the sliding grooves on both sides of the rigid part are provided with embedded grooves, and the two embedded grooves are movably provided with abutment blocks, and the inner ends of the abutment blocks are provided with permanent magnet blocks.

[0018] The rigid part is also equipped with an electromagnet, with its two ends extending into two embedded grooves. When the electromagnet is energized, its two ends repel the two permanent magnet blocks respectively; when the electromagnet is de-energized, its two ends attract the two permanent magnet blocks respectively.

[0019] Optionally, the wave detection component includes a lifting sleeve, which is movably sleeved outside the bottom of the detection tube. A stabilizing ring is fixedly fitted on the outer ring wall of the lifting sleeve. Several movable grooves are formed on the outer surface of the stabilizing ring. Movable blocks are elastically connected inside the movable grooves. One end of the movable block extending out of the movable groove is provided with an arc-shaped part, and several arc-shaped parts located outside the stabilizing ring together form a circular shape.

[0020] Optionally, a piezoelectric sheet is provided at the inner end of the movable groove, the piezoelectric sheet is electrically connected to the electromagnet, and several piezoelectric sheets are arranged in parallel; an elastic sheet is connected between the movable block and the inner end of the movable groove, and when the movable block is not subjected to external force, there is a gap between the inner end of the movable block and the piezoelectric sheet.

[0021] Optionally, the side wall of the detection tube is provided with a wire-passing opening for the wire to pass through, and the distance between the top of the stabilizing ring and the lifting sleeve is not less than 30 centimeters; both the stabilizing ring and the arc-shaped part are hollow structures, and both are made of plastic material.

[0022] Optionally, the surface of the slide rail is uniformly provided with grooves along its length, and the end of the abutment block facing away from the electromagnet is provided with teeth for matching the grooves.

[0023] Compared with the prior art, the present invention provides an automatic draft measurement device for port vessels, which has the following advantages:

[0024] 1. The present invention has a detection tube detachably connected below the sensor cover. When the sea surface is calm, the height difference between the sea surface and the deck can be directly detected by the sensor. When there are large waves on the sea surface, the detection tube can isolate the waves to improve the detection accuracy.

[0025] 2. The bottom of the detection tube in this invention is funnel-shaped, wider at the top and narrower at the bottom, which is used to reduce the influence of sea surface fluctuations on the liquid level height inside the tube, thereby helping to improve the accuracy of liquid level detection;

[0026] 3. The detection tube in this invention also has a wave detection component on the outside. When the waves are large, the floating plug inside the detection tube can be temporarily fixed relative to the inner wall of the detection tube, thereby avoiding the floating plug from shaking up and down due to the wave fluctuations, and further improving the accuracy of liquid level detection.

[0027] 4. The detection tube in this invention also has a support rod and an electromagnetic chuck on the outside. The electromagnetic chuck is used to adsorb and fix it to the side wall of the ship, thereby avoiding the detection tube from shaking back and forth due to the fluctuation of the waves. Attached Figure Description

[0028] Figure 1 A schematic diagram showing the ship's draft.

[0029] Figure 2 This is a schematic diagram of the structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the folded state of the main beam of the water gauge according to the present invention;

[0031] Figure 4 This is a schematic diagram showing the state of the detection tube of the present invention submerged in water;

[0032] Figure 5 This is a schematic diagram of the sensor cover structure of the present invention;

[0033] Figure 6 This is a cross-sectional view of the bottom of the detection tube of the present invention;

[0034] Figure 7 This is a schematic diagram of the floating plug structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the stabilizing ring structure of the present invention;

[0036] Figure 9 This is a schematic diagram of the lifting sleeve structure of the present invention;

[0037] Figure 10 for Figure 6 Enlarged view of point A in the middle;

[0038] Figure 11 for Figure 9 Enlarged view of point B in the middle;

[0039] Figure 12 This is a schematic diagram of the hull of the present invention tilting to one side;

[0040] Figure 13 This is a schematic diagram of the hull of the present invention tilting to the other side.

[0041] In the diagram: 100, main beam of the water gauge; 101, first rod; 102, second rod; 200, sensor cover; 300, elevation frame; 301, mounting base; 400, detection tube; 401, outer tube; 402, inner tube; 403, rotating tube; 404, floating plug; 4041, rigid part; 4042, foam block; 405, support rod; 406, electromagnetic chuck; 407, slide groove; 408, slide rail; 409, embedded groove; 410, abutment block; 411, permanent magnet block; 412, electromagnet; 413, wire hole; 414, raised ring; 500, wave detection component; 501, lifting sleeve; 502, stabilizing ring; 503, movable groove; 504, movable block; 505, arc-shaped part; 506, piezoelectric sheet; 507, elastic sheet. Detailed Implementation

[0042] 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.

[0043] Please see Figure 1 This diagram illustrates the ship's draft. When waves are present on the sea surface and impact the hull, the water level around the hull rises; conversely, when the waves recede, the water level drops. In other words, under the continuous action of waves, the surface of the water around the hull undulates. Therefore, if the height difference between the sea surface and the deck is directly measured using level sensors or other detection devices, the data will fluctuate, making it difficult for personnel to accurately determine the ship's draft.

[0044] To address the above problems, this application proposes the following technical solution:

[0045] Please see Figures 2-13 An automatic draft measurement device for port vessels includes a draft gauge main beam 100, a sensor cover 200, and a riser frame 300. The draft gauge main beam 100 is composed of a first rod 101 and a second rod 102 hinged together. Specifically, both the first rod 101 and the second rod 102 are metal square tubes, and they are rotatably coupled via a damping bearing to improve the stability of the rotatable connection. Simultaneously, the first rod 101 and the second rod 102 can also be folded together to reduce the storage volume.

[0046] The sensor cover 200 is fixedly mounted on the free end of the first rod 101. The bottom end of the sensor cover 200 is open. Inside the sensor cover 200 are a liquid level sensor assembly and an angle sensor (SST20). Specifically, the sensor cover 200 is a metal shell, which is fixed to one end of the first rod 101 by bolts. The liquid level sensor assembly includes a radar liquid level sensor (HRRD8 / 15 / 30-S1) and a laser liquid level sensor (ZYT-0100). The detection ends of both liquid level sensors point to the opening of the sensor cover 200, and are used to detect the height difference between the sea surface and the sensor transmitter. The angle sensor is used to measure the tilt of the hull in real time to help determine the hull's draft.

[0047] Furthermore, the extension frame 300 is fixedly mounted on the second rod 102 and is used to fix it to the hull. Specifically, there are two extension frames 300. The top of the extension frame 300 is fixed to the second rod 102 by bolts, and the bottom of the extension frame 300 is provided with a strong magnet mounting base 301, which contains a strong magnet. Therefore, the strong magnet at the bottom of the extension frame 300 can attract and fix the extension frame 300 to the deck of the hull, thereby fixing the device.

[0048] In addition, the second rod 102 houses a controller and a battery. A display screen is also located on the upper surface of the second rod 102. The signal output terminals of the level sensor assembly and the angle sensor are both connected to the controller, and the controller's signal output terminal is connected to the display screen. The controller has a built-in calculation program that can calculate and determine the draft at the center of the hull based on the detection values ​​from the angle sensor and the level sensor assembly. Furthermore, the controller is equipped with a signal transmission module for wireless connection to the user's mobile phone, allowing for convenient remote monitoring.

[0049] In this embodiment, the device is fixed to the deck using the extension frame 300. Then, the first rod 101 and the second rod 102 are unfolded, with the front end of the first rod 101 extending beyond the hull. At this time, the opening of the sensor cover 200 faces downwards, and the liquid level sensor assembly is used to detect the liquid level height, while the angle sensor is used to detect the tilt of the hull. The two sensors transmit the detection signals to the controller in real time, and the controller calculates and displays the data on the display screen.

[0050] like Figure 12 and Figure 13 As shown, B is the distance the water level gauge extends beyond the hull, which is a known constant; A is the detection distance of the level sensor; and ∠a is the measured value of the angle sensor. Clearly, the value of C can be calculated using trigonometric functions based on B and ∠a. Specifically, when the hull is as follows... Figure 12 When the ship is tilted, C = B * tana, and A + C is the draft at the corresponding position on the hull. When the hull is tilted... Figure 13 When tilted, C = B * sina, and AC is the draft at the corresponding position of the hull.

[0051] In some embodiments of this application, a detection tube 400 is also included. One end of the detection tube 400 is connected to the bottom end of the sensor cover 200, and the other end of the detection tube 400 is used to extend into water. The detection tube 400 includes an outer tube body 401, an inner tube body 402, and a rotating tube 403, which are sequentially sleeved from the outside to the inside. The outer surface of the rotating tube 403 has external threads, and the inner surface of the inner tube body 402 has internal threads. The rotating tube 403 and the inner tube body 402 are threadedly connected. One end of the rotating tube 403 extending outside the inner tube body 402 is detachably connected to the bottom end of the sensor cover 200. Specifically, the bottom opening of the sensor cover 200 has a threaded opening, and the top end of the rotating tube 403 is threadedly connected and fixed to the bottom end of the sensor cover 200.

[0052] It should be noted that the outer tube 401, inner tube 402, and rotating tube 403 are all made of carbon fiber, glass fiber, or a composite material of both, which are lightweight and have good toughness. Furthermore, the top end of the outer tube 401 and the bottom end of the inner tube 402 have mutually fitting retaining rings and grooves. When the outer tube 401 is fully extended, the retaining rings can be embedded in the grooves, thus preventing the outer tube 401 and inner tube 402 from moving easily. Simultaneously, by rotating the outer tube 401 and rotating tube 403, the overall length of the detection tube 400 can be adjusted, allowing the bottom end of the detection tube 400 to be inserted into the water at a suitable depth.

[0053] Furthermore, the bottom of the detection tube 400 is funnel-shaped, wider at the top and narrower at the bottom. A floating plug 404 is movably installed inside the detection tube 400, and a wave detection component 500 is fitted over the bottom of the detection tube 400. When the wave detection component 500 is impacted by external force, the floating plug 404 can remain relatively fixed to the inner wall of the detection tube 400. Specifically, the bottom end of the outer tube 401 is funnel-shaped to reduce the impact of water surface fluctuations on the liquid level inside the tube. Since a smaller pipe diameter results in greater relative surface tension of the water, the water body is less affected by external fluctuations. Therefore, the bottom end of the outer tube 401 is designed with a small diameter to reduce the impact of external water surface fluctuations on the liquid level.

[0054] In addition, a support rod 405 is provided on one side of the top of the outer tube 401, and an electromagnetic chuck 406 is provided at the end of the support rod 405. The electromagnetic chuck 406 is used to adhere to and fit against the side wall of the hull; in order to improve the stability of the detection tube 400 and avoid the bottom of the detection tube 400 from shaking violently due to seawater or wind factors.

[0055] The following is a detailed description of the structure of the floating plug 404 and the wave detection component 500:

[0056] The floating plug 404 includes a rigid part 4041 and a foam block 4042 disposed on the bottom surface of the rigid part 4041. The foam block 4042 is made of foam plastic. The overall density of the rigid part 4041 and the foam block 4042 is less than that of water, so the upper surface of the rigid part 4041 can be exposed above the water surface. The outer ring wall of the rigid part 4041 is provided with grooves 407 on both opposite sides. The bottom inner wall of the detection tube 400 is provided with a slide rail 408 along the axial direction. The slide rail 408 slides and engages with the corresponding groove 407. Therefore, the floating plug 404 can move up and down along the axial direction of the detection tube 400.

[0057] Furthermore, the inner ends of the sliding grooves 407 on both sides of the rigid part 4041 are provided with embedded grooves 409, and each embedded groove 409 is movably provided with abutment blocks 410. The inner end of the abutment blocks 410 is provided with permanent magnet blocks 411. An electromagnet 412 is also provided inside the rigid part 4041. The two ends of the electromagnet 412 extend into the two embedded grooves 409 respectively. When the electromagnet 412 is energized, the two ends of the electromagnet 412 repel the two permanent magnet blocks 411 respectively. When the electromagnet 412 is de-energized, the two ends of the electromagnet 412 attract the two permanent magnet blocks 411 respectively. That is, when the electromagnet 412 is energized, the electromagnet 412 can push the two abutment blocks 410 to move outward; when the electromagnet 412 is de-energized, due to the mutual attraction between the permanent magnet blocks 411 and the iron, the two abutment blocks 410 can move inward and retract into the embedded grooves 409.

[0058] Meanwhile, the surface of the slide rail 408 is uniformly provided with grooves along its length, and the end of the abutment block 410 facing away from the electromagnet 412 is provided with teeth for matching the grooves. Therefore, when the abutment block 410 moves outward, the teeth and grooves mesh with each other, thereby keeping the floating plug 404 and the inner wall of the detection tube 400 relatively fixed.

[0059] On the other hand, the wave detection component 500 includes a lifting sleeve 501, which is made of lightweight plastic. The lifting sleeve 501 is movably sleeved on the bottom of the detection tube 400. A stabilizing ring 502 is fixedly fitted on the outer ring wall of the lifting sleeve 501. Several movable grooves 503 are formed on the outer surface of the stabilizing ring 502. Movable blocks 504 are elastically connected inside the movable grooves 503. One end of the movable block 504 extending out of the movable groove 503 has an arc-shaped part 505, and several arc-shaped parts 505 located outside the stabilizing ring 502 together form a ring shape. The stabilizing ring 502 and the lifting sleeve 501 can be integrally molded, and both the stabilizing ring 502 and the arc-shaped part 505 are hollow structures and both are made of plastic. When the lifting sleeve 501 is inserted into the water, the water level is always approximately equal to that of the arc-shaped part 505.

[0060] Furthermore, a piezoelectric sheet 506 is provided at the inner end of the movable groove 503. The piezoelectric sheet 506 is electrically connected to the electromagnet 412, and several piezoelectric sheets 506 are arranged in parallel. An elastic sheet 507 is connected between the movable block 504 and the inner end of the movable groove 503. When the movable block 504 is not subjected to external force, there is a gap between the inner end of the movable block 504 and the piezoelectric sheet 506. Specifically, the piezoelectric sheet 506 is wrapped with a flexible sleeve to prevent it from being immersed in water and to ensure its normal operation. Secondly, the elastic sheet 507 is made of thin metal sheet with a certain degree of toughness. When the arc-shaped part 505 is not subjected to external pressure, the movable block 504 and the piezoelectric sheet 506 do not contact each other. When the arc-shaped part 505 is subjected to external pressure, and the component of the external force along the axial direction of the movable block 504 exceeds 5N, the inner end of the movable block 504 will be pressed against the piezoelectric sheet 506, thereby energizing the electromagnet 412.

[0061] It should be noted that a wire-passing opening 413 is provided on the side wall of the detection tube 400 for the wire to pass through, and the distance between the top of the stabilizing ring 502 and the top of the lifting sleeve 501 is not less than 30 centimeters. Since the piezoelectric sheet 506 and the electromagnet 412 are connected by wires, the wire-passing opening 413 must be provided on the side wall of the detection tube 400. In addition, the wire-passing opening 413 allows direct communication between the inside and outside of the detection tube 400, making it easy for seawater to directly enter the detection tube 400. Therefore, the function of the lifting sleeve 501 is to prevent seawater from directly passing through the wire-passing opening 413 into the detection tube 400. In this embodiment, the length of the lifting sleeve 501 is equivalent to the length of the outer tube 401. Since the distance between the top of the stabilizing ring 502 and the top of the lifting sleeve 501 is not less than 30 centimeters, when the lifting sleeve 501 is placed in water, the top of the lifting sleeve 501 is at least 30 centimeters above the horizontal plane.

[0062] It should also be noted that the bottom outer ring wall of the outer tube 401 has a protruding ring 414, and the inner diameter of the top of the lifting sleeve 501 is not greater than the outer diameter of the protruding ring 414, that is, the lifting sleeve 501 cannot be removed from the bottom of the outer tube 401.

[0063] Furthermore, when the sea surface is relatively calm, this embodiment does not require the installation of the detection tube 400. Instead, the radar level sensor directly detects the liquid level height, and then, combined with the detection values ​​from the angle sensor, the ship's draft can be calculated using trigonometric functions. When there are large waves, the detection tube 400 can be installed at the bottom of the sensor cover 200. In this case, a laser level sensor is needed to measure the height difference between the float plug 404 and the deck. That is, when the detection tube 400 is not installed, the radar level sensor is used for distance measurement; when the detection tube 400 is installed, the laser level sensor is used for distance measurement.

[0064] In this embodiment, to avoid the impact of waves on detection accuracy during application, the top end of the detection tube 400 can be connected to the open end of the sensor cover 200, and the inner tube 402 can be rotated appropriately to adjust the overall length of the detection tube 400 so that the narrow end of the bottom of the outer tube 401 can be inserted into the water. After the length of the detection tube 400 is adjusted, the inner tube 402 is slightly rotated to align the support rod 405 with the hull. Finally, the electromagnetic chuck 406 is energized, causing it to adhere to the outer wall of the hull, thereby fixing the detection tube 400 in place.

[0065] Since the lifting sleeve 501, the stabilizing ring 502, and the arc-shaped part 505 are all made of lightweight materials, and the lifting sleeve 501 is movably sleeved on the outside of the outer tube 401, when the lifting sleeve 501 falls into the water, the arc-shaped part 505 is always at the same height as the horizontal plane. When the horizontal plane is calm or the waves are small, as the draft of the hull increases, the floating plug 404 and the lifting sleeve 501 will gradually rise relative to the detection tube 400. When the waves are large, the sponge will impact the arc-shaped part 505, causing the movable block 504 to strike the piezoelectric plate 506, which in turn will energize the electromagnet 412 momentarily, causing the abutment block 410 to extend and engage with the tooth groove, thereby temporarily keeping the height of the floating plug 404 fixed and preventing it from rising and falling significantly due to the impact of the waves, thus improving the detection accuracy of the liquid level sensor assembly.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0067] 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 automatic draft measurement device for port vessels, characterized in that, include: The water gauge main beam is composed of a first rod and a second rod that are hinged together. A sensor cover is fixedly mounted on the free end of the first rod. The bottom end of the sensor cover is open. The sensor cover contains a liquid level sensor assembly and an angle sensor. A height-adjusting frame, which is fixedly mounted on the second pole and is used to fix the height-adjusting frame to the hull; A detection tube, one end of which is connected to the bottom of the sensor cover, and the other end of which is used to extend into the water; The bottom of the detection tube is funnel-shaped, wider at the top and narrower at the bottom. A floating plug is movably installed inside the detection tube. A wave detection component is installed on the outer sleeve of the bottom of the detection tube. When the wave detection component is impacted by an external force, the floating plug can remain relatively fixed to the inner wall of the detection tube.

2. The automatic draft measurement device for port vessels according to claim 1, characterized in that: The number of riser frames is two, and the bottom of the riser frame is provided with a strong magnet mounting base, and the strong magnet mounting base is provided with a strong magnet.

3. The automatic draft measuring device for port vessels according to claim 1, characterized in that: The second rod body has a controller and a battery inside, and a display screen is also provided on the upper surface of the second rod body. The signal output terminals of the liquid level sensor assembly and the angle sensor are both connected to the controller, and the signal output terminal of the controller is connected to the display screen.

4. The automatic draft measuring device for port vessels according to claim 1, characterized in that: The detection tube includes an outer tube body, an inner tube body, and a rotating tube that are sequentially sleeved from the outside to the inside. The outer surface of the rotating tube is provided with external threads. The rotating tube and the inner tube body are threaded together. One end of the rotating tube that extends out of the inner tube body is detachably connected to the bottom end of the sensor cover. A support rod is provided on one side of the top of the outer tube, and an electromagnetic chuck is provided at the end of the support rod. The electromagnetic chuck is used to adhere to and fit against the side wall of the hull.

5. The automatic draft measuring device for port vessels according to claim 1, characterized in that: The floating plug includes a rigid part and a foam block disposed on the bottom surface of the rigid part. The outer ring wall of the rigid part has grooves on both opposite sides. The bottom inner wall of the detection tube is provided with a slide rail along the axial direction. The slide rail slides in cooperation with the corresponding groove.

6. The automatic draft measuring device for port vessels according to claim 5, characterized in that: The inner ends of the sliding grooves on both sides of the rigid part are provided with embedded grooves, and the two embedded grooves are provided with abutting blocks, and the inner ends of the abutting blocks are provided with permanent magnet blocks. The rigid part is also equipped with an electromagnet, with its two ends extending into two embedded grooves. When the electromagnet is energized, its two ends repel the two permanent magnet blocks respectively; when the electromagnet is de-energized, its two ends attract the two permanent magnet blocks respectively.

7. The automatic draft measuring device for port vessels according to claim 6, characterized in that: The wave detection component includes a lifting sleeve, which is movably sleeved outside the bottom of the detection tube. A stabilizing ring is fixedly fitted on the outer ring wall of the lifting sleeve. Several movable grooves are opened on the outer surface of the stabilizing ring. Movable blocks are elastically connected inside the movable grooves. One end of the movable block extending out of the movable groove is provided with an arc-shaped part, and several arc-shaped parts located outside the stabilizing ring together form a circular shape.

8. The automatic draft measuring device for port vessels according to claim 7, characterized in that: The inner end of the movable groove is provided with a piezoelectric sheet, which is electrically connected to the electromagnet, and several piezoelectric sheets are arranged in parallel; an elastic sheet is connected between the movable block and the inner end of the movable groove, and when the movable block is not subjected to external force, there is a gap between the inner end of the movable block and the piezoelectric sheet.

9. The automatic draft measuring device for port vessels according to claim 8, characterized in that: The detection tube has a threading port on its side wall for the wire to pass through, and the distance between the top of the stabilizing ring and the lifting sleeve is not less than 30 centimeters; both the stabilizing ring and the arc-shaped part are hollow structures and are made of plastic.

10. An automatic draft measuring device for port vessels according to claim 6, characterized in that: The surface of the slide rail is uniformly provided with grooves along its length, and the end of the abutment block facing away from the electromagnet is provided with teeth to match the grooves.

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