Automatic measuring device for port ship water gauge

Abstract

The invention relates to ship auxiliary equipment, which comprises a water gauge main beam, a sensor cover and a heightening frame, and is characterized in that the water gauge main beam is formed by hinging a first rod body and a second rod body; the sensor cover is fixedly arranged at the free end of the first rod body, the bottom end of the sensor cover is open, and a liquid level sensor assembly and an angle sensor are arranged in the sensor cover; the heightening frame is fixedly arranged on the second rod body and used for being fixed to the ship body. The detection pipe is detachably connected to the lower portion of the sensor cover, when the sea surface is calm, the height difference from the sea surface to the deck can be directly detected through the sensor, and when the sea surface has large sea waves, the sea waves can be isolated through the detection pipe, so that the detection precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship auxiliary equipment, and particularly to an automatic draft measuring device for port ships. Background Technique

[0002] The function of ballast water is to enable the ship to maintain a certain draft depth during the unloaded voyage of the ship, so that the ship can sail safely without capsizing or other accidents. At the same time, an appropriate amount of ballast water can also ensure that the propeller has sufficient draft, and the distribution of ballast water can be adjusted to regulate the center of gravity of the ship, so that the ship meets the current ocean conditions and ensures stability and operation safety during the voyage.

[0003] At present, when a ship is docked at a port for loading, some ballast water needs to be discharged into the sea to meet the loading requirements. Specifically, during the cargo loading operation, the staff needs to observe the draft to judge the draft depth of the ship and the distribution of the center of gravity of the ship, and ensure that after the cargo is loaded, the ship can be in a balanced state and is not overloaded or unevenly loaded. In the traditional technology, during the process of observing the draft, the draft on the side of the ship against the shore can be directly observed on the dock; while for the draft on the outside of the ship, since there is no foothold during the reading process, the staff can only climb down through the ladder to read it, which is very troublesome and has certain potential safety hazards.

[0004] In the prior art, there are also intelligent drafts that automatically detect the liquid level height through sensors, which is efficient and convenient. However, since the sea level is not a flat surface but has a certain amplitude of waves, when the waves are small, the detection data of the sensor is still credible. But when the waves are large, due to the undulating sea surface around the ship, the detection data of the intelligent draft will fluctuate back and forth, so it is difficult for the staff to accurately judge the accurate data of the draft. For this reason, we have proposed an automatic draft measuring device for port ships to well solve the above drawbacks. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic draft measuring device for port ships to solve the problems raised in the above background technique.

[0006] The present invention is achieved through the following technical solutions: an automatic draft measuring device for port ships, comprising:

[0007] A draft main beam, which is composed of a first rod body and a second rod body hinged to each other;

[0008] A sensor cover, which is fixedly arranged at the free end of the first rod body, the bottom end of the sensor cover is open, and a liquid level sensor assembly and an angle sensor are arranged inside the sensor cover;

[0009] The elevated rack is fixedly arranged on the second rod body and is used for being fixed on the hull.

[0010] The detection tube, one end of the detection tube is connected to the bottom end of the sensor cover, and the other end of the detection tube is used for extending into the water.

[0011] Wherein, the bottom of the detection tube is in a funnel shape that is wider at the top and narrower at the bottom. A floating plug is movably arranged inside the detection tube. A wave detection component is sleeved outside the bottom of the detection tube. When the wave detection component is impacted by an external force, the floating plug can remain relatively fixed with the inner wall of the detection tube.

[0012] Optionally, the number of the elevated racks is two. A strong magnet mounting seat is arranged at the bottom of the elevated rack, and a strong magnet is arranged inside the strong magnet mounting seat.

[0013] Optionally, a controller and a battery are arranged inside the second rod body. A display screen is also arranged on the upper surface of the second rod body. The signal output ends of the liquid level sensor component and the angle sensor are both connected to the controller, and the signal output end 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 sleeved in sequence from outside to inside. External threads are arranged on the outer surface of the rotating tube. The rotating tube is threadedly connected with the inner tube body. 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 arranged on one side of the top of the outer tube body. An electromagnetic chuck is arranged at the end of the support rod, and the electromagnetic chuck is used for adsorbing and fitting with the side wall of the hull.

[0016] Optionally, the floating plug includes a hard part and a foam block arranged on the bottom surface of the hard part. Sliding grooves are respectively opened on opposite sides of the outer ring wall of the hard part. Slide rails are arranged along the axial direction on the inner wall of the bottom of the detection tube, and the slide rails are slidably matched with the corresponding sliding grooves.

[0017] Optionally, inner embedding grooves are respectively opened at the inner ends of the sliding grooves on both sides of the hard part. Contact blocks are movably arranged in the two inner embedding grooves, and permanent magnetic blocks are arranged at the inner ends of the contact blocks.

[0018] An electromagnet is also arranged inside the hard part. Two ends of the electromagnet respectively extend into the two inner embedding grooves. When the electromagnet is powered on, the two ends of the electromagnet respectively repel the two permanent magnetic blocks. When the electromagnet is powered off, the two ends of the electromagnet respectively attract the two permanent magnetic blocks.

[0019] Optionally, the sea wave detection component includes a lifting sleeve movably sleeved outside the bottom of the detection tube. A stabilizing ring is fixedly sleeved on the outer wall of the lifting sleeve. A plurality of moving grooves are formed on the outer surface of the stabilizing ring. An active block is elastically connected inside the moving groove. One end of the active block extending outside the moving groove is provided with an arc portion, and a plurality of arc portions located outside the stabilizing ring together form a circular ring.

[0020] Optionally, a piezoelectric sheet is provided at the inner end of the moving groove. The piezoelectric sheet is electrically connected to the electromagnet, and a plurality of piezoelectric sheets are connected in parallel. An elastic sheet is connected between the active block and the inner end of the moving groove. When the active block is not affected by an external force, there is a gap between the inner end of the active block and the piezoelectric sheet.

[0021] Optionally, a wire passing port for a wire to pass through is formed on the side wall of the detection tube. The distance between the top end of the stabilizing ring and the lifting sleeve is not less than 30 cm. Both the stabilizing ring and the arc portion are hollow structures and are made of plastic materials.

[0022] Optionally, tooth grooves are evenly formed on the surface of the slide rail along its length direction. A tooth for matching with the tooth groove is provided at one end of the abutting block facing away from the electromagnet.

[0023] Compared with the prior art, the present invention provides a port ship draft automatic measuring device, which has the following beneficial effects:

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

[0025] 2. The bottom end of the detection tube in the present invention is in a funnel shape with a wider top and a narrower bottom, which is used to reduce the influence of sea surface fluctuations on the liquid level height in the tube, thereby helping to improve the liquid level detection accuracy.

[0026] 3. The detection tube in the present invention is also provided with a sea wave detection component outside. When the sea waves are large, the floating plug in the detection tube can be temporarily fixed relative to the inner wall of the detection, thereby avoiding the up and down shaking of the floating plug caused by sea wave fluctuations, and further improving the liquid level detection accuracy.

[0027] 4. The detection tube in the present invention is also provided with a support rod and an electromagnetic chuck outside. The electromagnetic chuck is used to adsorb and fix on the side wall of the hull, thereby avoiding the back and forth shaking of the detection tube caused by sea wave fluctuations. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the hull draft state;

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

[0030] Figure 3 Schematic diagram of the folding state of the water gauge main beam of the present invention;

[0031] Figure 4 Schematic diagram of the state where the detection tube extends into the water of the present invention;

[0032] Figure 5 Schematic diagram of the structure of the sensor cover of the present invention;

[0033] Figure 6 Bottom sectional view of the detection tube of the present invention;

[0034] Figure 7 Schematic diagram of the structure of the floating plug of the present invention;

[0035] Figure 8 Schematic diagram of the structure of the stabilizing ring of the present invention;

[0036] Figure 9 Schematic diagram of the structure of the lifting sleeve of the present invention;

[0037] Figure 10 is Figure 6 Enlarged corresponding view at position A in;

[0038] Figure 11 is Figure 9 Enlarged corresponding view at position B in;

[0039] Figure 12 Schematic diagram of the hull tilting to one side of the present invention;

[0040] Figure 13 Schematic diagram of the hull tilting to the other side of the present invention.

[0041] In the figure: 100, water gauge main beam; 101, first rod body; 102, second rod body; 200, sensor cover; 300, heightening frame; 301, mounting seat; 400, detection tube; 401, outer tube body; 402, inner tube body; 403, rotating tube; 404, floating plug; 4041, hard part; 4042, foam block; 405, support rod; 406, electromagnetic chuck; 407, sliding groove; 408, sliding rail; 409, embedded groove; 410, abutting block; 411, permanent magnet block; 412, electromagnet; 413, wire passing port; 414, protruding ring; 500, sea wave detection assembly; 501, lifting sleeve; 502, stabilizing ring; 503, moving groove; 504, moving block; 505, arc part; 506, piezoelectric sheet; 507, elastic sheet. Detailed implementation manners

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figure 1 , which is a schematic diagram of the hull draft state. When there are waves on the sea surface and the waves hit the hull, the water surface height around the hull will rise; when the waves recede, the water surface height around the hull will drop. That is, under the action of continuous waves, the surface of the water area around the hull undulates up and down. Therefore, if the height difference from the sea surface to the deck is directly measured by detection devices such as liquid level sensors, the detection data will also fluctuate, making it difficult for the staff to accurately judge the draft depth of the hull.

[0044] To solve the above problems, the present application proposes the following technical solutions:

[0045] Please refer to Figures 2 - 13 , an automatic draft measuring device for port ships, including a draft main beam 100, a sensor cover 200, and a heightening frame 300. Among them, the draft main beam 100 is composed of a first rod body 101 and a second rod body 102 that are hinged to each other; specifically, both the first rod body 101 and the second rod body 102 are metal square tubes, and they are rotationally matched through a damping bearing to improve the stability of the rotational connection. At the same time, the first rod body 101 and the second rod body 102 can also be folded with each other to reduce the storage volume.

[0046] The sensor cover 200 is fixedly arranged at the free end of the first rod body 101. The bottom end of the sensor cover 200 is open. Inside the sensor cover 200, there are a liquid level sensor assembly and an angle sensor (SST20); specifically, the sensor cover 200 is a metal shell, and it is fixed to one end of the first rod body 101 through bolt connection. 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 the two liquid level sensors both point to the opening of the sensor cover 200 and are used to detect the height difference from the sea surface to the sensor transmitting end; the angle sensor is used to measure the inclination of the hull in real time to assist in judging the draft depth of the hull.

[0047] Furthermore, the riser 300 is fixedly arranged on the second rod body 102 and is used for being fixed on the hull. Specifically, the number of the risers 300 is two. The top of the riser 300 is fixed to the second rod body 102 through bolt connection. A strong magnet mount 301 is provided at the bottom of the riser 300, and a strong magnet is arranged inside the strong magnet mount 301. Therefore, through the strong magnet at the bottom of the riser 300, the riser 300 can be adsorbed and fixed on the deck of the hull, thereby fixing the device.

[0048] In addition, a controller and a battery are arranged inside the second rod body 102. A display screen is further arranged on the upper surface of the second rod body 102. The signal output ends of the liquid level sensor assembly and the angle sensor are both connected to the controller, and the signal output end of the controller is connected to the display screen. The controller is built with a calculation program and can convert and judge the draft depth at the central part of the hull according to the detection values of the angle sensor and the liquid level sensor assembly. In addition, a signal transmitting module is mounted on the controller and is used for wireless connection with the user's mobile phone, so as to facilitate the user to remotely view.

[0049] In the specific application process of this embodiment, the device is fixed on the deck through the riser 300, and then the first rod body 101 and the second rod body 102 are unfolded, so that the front end of the first rod body 101 extends out of the hull. At this time, the opening end of the sensor cover 200 faces downward, the liquid level sensor assembly is used for detecting the liquid level height, and the angle sensor is used for detecting the inclination of the hull. The two sensors transmit the detection signals to the controller in real time, and the controller reflects the data on the display screen through calculation.

[0050] As Figure 12 and Figure 13 shown, where B is the distance that the water gauge extends out of the hull, and this distance is a known fixed value. A is the detection distance of the liquid level sensor, and ∠a is the measured value of the angle sensor. Obviously, through B and ∠a, the value of C can be calculated according to trigonometric functions. Specifically, when the hull is inclined as Figure 12 shown, C = B * tan a, and A + C is the draft depth at the corresponding position of the hull. When the hull is inclined as Figure 13 shown, C = B * sin a, and A - C is the draft depth at the corresponding position of the hull.

[0051] In some embodiments of the present application, it further includes a detection tube 400. 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 the water. Among them, the detection tube 400 includes an outer tube body 401, an inner tube body 402, and a rotating tube 403 that are sleeved in sequence from the outside to the inside. The outer surface of the rotating tube 403 is provided with an external thread, and the inner surface of the inner tube body 402 has an internal thread. The rotating tube 403 and the inner tube body 402 are threadedly connected, and 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 opening at the bottom end 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 body 401, the inner tube body 402, and the rotating tube 403 are all made of carbon fiber or glass fiber or a composite material of the two, and have the characteristics of light weight and good toughness. In addition, the top end of the outer tube body 401 and the bottom end of the inner tube body 402 have mutually adapted snap rings and slots. When the outer tube body 401 is fully stretched, the snap ring can be embedded in the slot, thereby preventing the outer tube body 401 and the inner tube body 402 from moving easily. At the same time, by rotating the outer tube body 401 and the rotating tube 403, the overall length of the detection tube 400 can be adjusted, so that the depth of the bottom end of the detection tube 400 inserted into the water is appropriate.

[0053] Furthermore, the bottom of the detection tube 400 is in the shape of a funnel with a wider top and a narrower bottom. A floating plug 404 is movably arranged inside the detection tube 400, and a sea wave detection component 500 is sleeved outside the bottom of the detection tube 400. When the sea wave detection component 500 is impacted by an external force, the floating plug 404 can remain relatively fixed with respect to the inner wall of the detection tube 400. Specifically, the bottom end of the outer tube body 401 is in the shape of a funnel, and its function is to reduce the influence of water surface fluctuations on the liquid level height inside the tube. Since the smaller the pipe diameter, the greater the relative tension of water and the smaller the influence of the water body by external fluctuations, the bottom end of the outer tube body 401 is designed to have a small diameter to reduce the influence of external water surface fluctuations on the liquid level height.

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

[0055] The following describes the specific structures of the floating plug 404 and the sea wave detection component 500 in detail:

[0056] Among them, the floating plug 404 includes a hard part 4041 and a foam block 4042 provided on the bottom surface of the hard part 4041. The foam block 4042 is made of foam plastic. The overall density of the hard part 4041 and the foam block 4042 is less than that of water. Therefore, the upper surface of the hard part 4041 can be exposed above the water surface; sliding grooves 407 are formed on both opposite sides of the outer circumferential wall of the hard part 4041. A slide rail 408 is axially provided on the bottom inner wall of the detection tube 400. The slide rail 408 is slidably matched with the corresponding sliding groove 407; therefore, the floating plug 404 can move up and down along the axis of the detection tube 400.

[0057] Further, inner embedding grooves 409 are formed at the inner ends of the sliding grooves 407 on both sides of the hard part 4041. Contact blocks 410 are movably arranged in the two inner embedding grooves 409. A permanent magnet block 411 is provided at the inner end of the contact block 410; an electromagnet 412 is further provided inside the hard part 4041. Two ends of the electromagnet 412 respectively extend into the two inner embedding grooves 409. When the electromagnet 412 is energized, the two ends of the electromagnet 412 respectively repel the two permanent magnet blocks 411; when the electromagnet 412 is powered off, the two ends of the electromagnet 412 respectively attract the two permanent magnet blocks 411. That is, when the electromagnet 412 is energized, the electromagnet 412 can push the two contact blocks 410 to move outwards; when the electromagnet 412 is powered off, since the permanent magnet block 411 and iron attract each other, the two contact blocks 410 can move inwards and retract into the inner embedding grooves 409.

[0058] Meanwhile, tooth grooves are evenly formed on the surface of the slide rail 408 along its own length direction. A tooth for matching with the tooth groove is provided at one end of the contact block 410 facing away from the electromagnet 412. Therefore, when the contact block 410 moves outwards, since the tooth and the tooth groove are engaged with each other, the floating plug 404 and the inner wall of the detection tube 400 can be kept relatively fixed.

[0059] On the other hand, the sea wave detection assembly 500 includes a lifting sleeve 501. The lifting sleeve 501 is made of lightweight plastic material. The lifting sleeve 501 is movably sleeved outside the bottom of the detection tube 400. A stabilizing ring 502 is fixedly sleeved on the outer circumferential wall of the lifting sleeve 501. A plurality of movable grooves 503 are formed on the outer surface of the stabilizing ring 502. An elastic connection is provided between the inside of the movable groove 503 and a movable block 504. An arc part 505 is provided at one end of the movable block 504 extending out of the movable groove 503. A plurality of arc parts 505 located outside the stabilizing ring 502 together form a circular ring. Among them, the stabilizing ring 502 and the lifting sleeve 501 can adopt an integrally formed structure, and both the stabilizing ring 502 and the arc part 505 are hollow structures and are both made of plastic materials; when the lifting sleeve 501 is inserted into the water, the water surface height is always equivalent to the arc part 505.

[0060] Furthermore, a piezoelectric sheet 506 is provided at the inner end of the movable slot 503. The piezoelectric sheet 506 is electrically connected to the electromagnet 412, and several piezoelectric sheets 506 are connected in parallel. An elastic sheet 507 is connected between the inner end of the movable block 504 and the inner end of the movable slot 503. When the movable block 504 is not subject to an external force, there is a gap between the inner end of the movable block 504 and the piezoelectric sheet 506. Specifically, the outside of the piezoelectric sheet 506 is wrapped with a flexible sleeve, which is used to prevent the piezoelectric sheet 506 from being immersed in water and keep the piezoelectric sheet 506 working properly. Secondly, the elastic sheet 507 is made of a metal sheet and has a certain toughness. When the arc portion 505 is not subject to an external extrusion force, the movable block 504 and the piezoelectric sheet 506 are not in contact. When the arc portion 505 is subject to an external extrusion force and the component force of this external force along the axial direction of the movable block 504 exceeds 5 N, the inner end of the movable block 504 will be pressed against the piezoelectric sheet 506, so that the electromagnet 412 is energized.

[0061] It should be noted that a wire passing port 413 for wires to pass through is provided on the side wall of the detection tube 400, and the distance between the stabilizing ring 502 and the top end of the lifting sleeve 501 is not less than thirty centimeters. Since the piezoelectric sheet 506 and the electromagnet 412 are connected by wires, there must be a wire passing port 413 on the side wall of the detection tube 400. In addition, the wire passing port 413 makes the inside and outside of the detection tube 400 directly communicate, and seawater is easily directly poured into the detection tube 400. Therefore, the function of the lifting sleeve 501 is to prevent seawater from directly passing through the wire passing port 413 and entering the detection tube 400. In this embodiment, the length of the lifting sleeve 501 is equivalent to the length of the outer tube body 401. Since the distance between the stabilizing ring 502 and the top end of the lifting sleeve 501 is not less than thirty centimeters, when the lifting sleeve 501 is placed in water, the top end of the lifting sleeve 501 is at least thirty centimeters above the water surface.

[0062] It should also be pointed out that a convex ring 414 is formed by protruding the outer ring wall at the bottom of the outer tube body 401, and the inner diameter of the top end of the lifting sleeve 501 is not greater than the outer diameter of the convex ring 414, that is, the lifting sleeve 501 cannot be detached from the bottom of the outer tube body 401.

[0063] In addition, when the sea surface is relatively calm, in this embodiment, the detection tube 400 does not need to be installed, but the radar liquid level sensor is directly used to detect the liquid level height, and then combined with the detection value of the angle sensor, the draft depth of the ship can be calculated through trigonometric functions. When there are large waves on the sea surface, the detection tube 400 can be installed at the bottom end of the sensor cover 200. At this time, the laser liquid level sensor needs to be used to measure the height difference between the floating plug 404 and the deck. That is, when the detection tube 400 is not installed, the radar liquid level sensor is used for ranging; when the detection tube 400 is installed, the laser liquid level sensor is used for ranging.

[0064] In the specific application process of this embodiment, in order to avoid the influence of sea waves on the detection accuracy, the top end of the detection tube 400 can be connected to the opening end of the sensor cover 200, and the inner tube body 402 can be appropriately rotated to adjust the overall length of the detection tube 400 so that the narrow bottom end of the outer tube body 401 is inserted into the water. At the same time, after the length of the detection tube 400 is adjusted, the inner tube body 402 is slightly rotated to align the support rod 405 with the hull, and finally the electromagnetic chuck 406 is energized to make the electromagnetic chuck 406 adsorb and fit with the outer wall of the hull, thereby fixing the detection tube 400.

[0065] Since the lifting sleeve 501, the stabilizing ring 502, and the arc portion 505 are all made of lightweight materials, and the lifting sleeve 501 is movably sleeved outside the outer tube body 401, when the lifting sleeve 501 falls into the water, the arc portion 505 is always at the same height as the horizontal plane. When the water surface is calm or the waves are small, as the draft of the hull increases continuously, the floating plug 404 and the lifting sleeve 501 will also rise relative to the detection tube 400 gradually. When the sea waves are large, the sponge will impact the arc portion 505, causing the movable block 504 to impact the piezoelectric sheet 506, and then making the electromagnet 412 energize instantaneously to make the abutting block 410 extend out and engage with the tooth groove, so that the height of the floating plug 404 can be temporarily fixed and will not cause obvious up and down lifting of the floating plug 404 due to the impact of the sea waves, thereby improving the detection accuracy of the liquid level sensor assembly.

[0066] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0067] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic draft measuring device for port ships, characterized in that Including: A water gauge main beam, which is composed of a first rod body and a second rod body hinged to each other; A sensor cover, which is fixedly arranged at the free end of the first rod body. The bottom end of the sensor cover is open, and a liquid level sensor assembly and an angle sensor are arranged inside the sensor cover; An extension frame, which is fixedly arranged on the second rod body and is used to be fixed on the ship hull; A detection tube, one end of which is connected to the bottom end of the sensor cover, and the other end of which is used to extend into the water; Wherein, the bottom of the detection tube is in a funnel shape with a wider top and a narrower bottom. A floating plug is movably arranged inside the detection tube, and a sea wave detection assembly is sleeved outside the bottom of the detection tube. When the sea wave detection assembly is impacted by an external force, the floating plug can remain relatively fixed with the inner wall of the detection tube.

2. The automatic draft measuring device for port ships according to claim 1, characterized in that: The number of the extension frames is two. A strong magnet mounting seat is arranged at the bottom of the extension frame, and a strong magnet is arranged inside the strong magnet mounting seat.

3. The automatic draft measuring device for port ships according to claim 1, wherein: A controller and a battery are arranged inside the second rod body. A display screen is also arranged on the upper surface of the second rod body. The signal output ends of the liquid level sensor assembly and the angle sensor are both connected to the controller, and the signal output end of the controller is connected to the display screen.

4. The automatic draft measuring device for port ships according to claim 1, wherein: The detection tube includes an outer tube body, an inner tube body and a rotating tube sleeved in sequence from outside to inside. External threads are arranged on the outer surface of the rotating tube, and the rotating tube is threadedly connected with the inner tube body. One end of the rotating tube extending outside the inner tube body is detachably connected to the bottom end of the sensor cover; One side of the top of the outer tube body is provided with a support rod, and an electromagnetic chuck is arranged at the end of the support rod. The electromagnetic chuck is used to adsorb and fit with the side wall of the ship hull.

5. The automatic draft measuring device for port ships according to claim 1, wherein: The floating plug includes a hard part and a foam block arranged on the bottom surface of the hard part. Sliding grooves are respectively opened on the opposite sides of the outer ring wall of the hard part. Slide rails are arranged along the axial direction on the inner wall of the bottom of the detection tube, and the slide rails are slidably matched with the corresponding sliding grooves.

6. The automatic draft measuring device for port ships according to claim 5, characterized in that: Inner embedding grooves are respectively opened at the inner ends of the sliding grooves on both sides of the hard part. Contact blocks are movably arranged in the two inner embedding grooves, and permanent magnet blocks are arranged at the inner ends of the contact blocks; An electromagnet is also arranged inside the hard part. The two ends of the electromagnet respectively extend into the two inner embedding grooves. When the electromagnet is powered on, the two ends of the electromagnet respectively repel the two permanent magnet blocks; when the electromagnet is powered off, the two ends of the electromagnet respectively attract the two permanent magnet blocks.

7. The automatic draft measuring device for a port ship according to claim 6, characterized in that: The sea wave detection assembly includes a lifting sleeve, which is movably sleeved outside the bottom of the detection tube. A stabilizing ring is fixedly sleeved on the outer ring wall of the lifting sleeve. A plurality of movable grooves are opened on the outer surface of the stabilizing ring. An active block is elastically connected inside the movable groove. One end of the active block extending outside the movable groove is provided with an arc part, and a plurality of arc parts located outside the stabilizing ring together enclose a circular ring.

8. The automatic draft measuring device for port ships according to claim 7, characterized in that: Piezoelectric sheets are arranged at the inner ends of the movable grooves. The piezoelectric sheets are electrically connected to the electromagnet, and a plurality of piezoelectric sheets are connected in parallel; an elastic sheet is connected between the active block and the inner end of the movable groove. When the active block is not affected by an external force, there is a gap between the inner end of the active block and the piezoelectric sheet.

9. The automatic draft measuring device for port ships according to claim 8, characterized in that: A wire passing opening for a wire to pass through is formed in the side wall of the detection tube, and the distance between the stabilizing ring and the top end of the lifting sleeve is not less than 30 cm; both the stabilizing ring and the arc-shaped part are hollow structures and are both made of plastic materials.

10. The automatic draft measuring device for port ships according to claim 6, characterized in that: Tooth grooves are uniformly formed on the surface of the slide rail along its own length direction, and teeth for matching with the tooth grooves are provided at one end of the abutting block facing away from the electromagnet.

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