Stern bearing abrasion loss monitoring system and ship

Abstract

The invention discloses a stern bearing abrasion loss monitoring system which comprises a base, a batten, a stern shaft and an ultrasonic monitoring device, the batten is provided with a mounting surface attached to the base and a supporting surface for supporting the stern shaft, the ultrasonic monitoring device comprises a probe and a processor, the probe is connected with the mounting surface or extends into the batten, and the processor is connected with the batten. The probe is used for transmitting excitation signals to the supporting surface and receiving reflection signals, and the processor is in communication connection with the probe and calculates the distance between the probe and the supporting surface according to the excitation signals and the reflection signals. The probe can emit an excitation signal and receive a reflection signal, the processor can calculate the distance between the probe and the supporting face according to the excitation signal and the reflection signal, and then the abrasion degree of the bearing bar can be evaluated. As the probe is not in contact with external seawater, on one hand, the probe can be prevented from being corroded by the seawater, and on the other hand, the influence of surge on a measurement result can be avoided, so that the stability and the accuracy of the stern bearing abrasion loss monitoring system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship condition monitoring, and in particular to a stern bearing wear monitoring system and a ship. Background Art

[0002] Ships navigate the water using propellers driven by power plants. The stern tube, a component of the ship's shafting system, is fixed to the stern of the hull. It is a pipe section equipped with sealing and support devices, allowing the stern shaft to pass through, through which the propeller is connected to the power plant. While the ship is sailing, the stern tube bearings bear the uneven cantilever loads of the propeller rotating in the water, the dynamic loads of shaft-type propellers when they encounter obstacles, the additional vibration forces that may occur during operation, and the weight loads of the stern shaft or propeller shaft and its accessories. Furthermore, as the tonnage of ships continues to increase, the stern shaft will deflect under the action of the propeller, placing significant edge loads on the stern tube bearings, causing them to constantly be in extremely poor lubrication conditions and resulting in severe wear.

[0003] The existing stern shaft bearing wear monitoring system can be found in patent application number CN202210620447.3. A measuring mounting hole is provided at the middle bearing of the stern tube bearing seat, so that the measuring mounting hole passes through the wall of the stern tube. The sensor probe contacts the stern shaft through the mounting hole to measure the degree of bearing wear. However, the sensor probe is in direct contact with seawater, and the impact of marine growth and surge on measurement accuracy and measurement equipment needs to be addressed. Therefore, it is not yet mature for practical engineering applications. Therefore, how to prevent the sensor probe from directly contacting seawater is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and to provide a stern bearing wear monitoring system and a ship, so as to solve the technical problem in the prior art that the sensor probe is in direct contact with seawater.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In one aspect, the present invention provides a stern bearing wear monitoring system, comprising: base; a slat having a mounting surface attached to the base and a support surface for supporting the stern shaft; and An ultrasonic monitoring device includes a probe and a processor. The probe is connected to the mounting surface or extends into the slat and is used to transmit an excitation signal to the support surface and receive a reflected signal. The processor is communicatively connected to the probe and calculates the distance between the probe and the support surface based on the excitation signal and the reflected signal.

[0006] In some embodiments, the probe includes a flexible shell, an excitation module and a receiving module. The outer wall of the flexible shell presses against the slat. The excitation module and the receiving module are both built into the flexible shell and press against the inner wall of the flexible shell. The excitation module is used to emit an excitation signal, and the receiving module is used to receive a reflected signal.

[0007] In some embodiments, the mounting surface is provided with a mounting groove, and the flexible shell is embedded in the mounting groove.

[0008] In some embodiments, the probe further comprises a plurality of connecting pins, one end of each connecting pin being connected to the flexible shell and the other end of each connecting pin being connected to the slats and / or the base.

[0009] In some embodiments, a plurality of the connecting pins are arranged along the circumference of the flexible shell.

[0010] In some embodiments, the probe further includes a signal conditioning module, the excitation module is communicatively connected to the receiving module, and the signal conditioning module is communicatively connected to the receiving module and the processor.

[0011] In some embodiments, the base is provided with a mounting hole connected to the slats, and the conditioning module is built into the mounting hole.

[0012] In some embodiments, the base further comprises a sealing gasket, and a detachable cover of the sealing gasket is disposed on the mounting hole.

[0013] In some embodiments, the flexible housing comprises a flexible metal housing.

[0014] In another aspect, the present invention provides a ship comprising the above-mentioned stern bearing wear monitoring system.

[0015] The stern bearing wear monitoring system provided by the present invention has the following advantages: the slats used to support the stern shaft gradually wear out over time. Since the probe is connected to the mounting surface or extends into the slats, it can transmit an excitation signal and receive a reflected signal. The processor can calculate the distance between the probe and the supporting surface based on the excitation and reflected signals, thereby assessing the degree of wear on the stern bearing. Because the probe of the present application does not come into contact with external seawater, it can prevent seawater corrosion from the probe and the influence of surges on the measurement results, thereby improving the stability and accuracy of the stern bearing wear monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic structural diagram of a stern bearing wear monitoring system provided by an embodiment of the present invention; Figure 2This is a schematic diagram of the internal structure of the base and slats provided in an embodiment of the present invention; Figure 3 Schematic diagram of the internal structure of the probe provided by an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal communication relationship of the probe provided by an embodiment of the present invention; Explanation of the reference numerals: base 100, mounting hole 110, sealing gasket 120, slat 200, mounting groove 210, stern shaft 300, ultrasonic monitoring device 400, probe 410, flexible shell 411, excitation module 412, receiving module 413, connecting pin 414, signal conditioning module 415, A / D converter 4151, conditioner 4152, processor 420. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In order to solve the technical problem of how to avoid direct contact between the sensor probe and seawater, the present invention provides a stern bearing wear monitoring system, which can prevent seawater from corroding the probe and further avoid the influence of surge on the measurement results, thereby improving the stability and accuracy of the stern bearing wear monitoring system.

[0019] It should be noted that the stern bearing wear monitoring system of the present invention is used for but not limited to bearing monitoring of the stern shaft of a ship. For the sake of convenience, in the present invention, only the application of the stern bearing wear monitoring system to bearing monitoring of the stern shaft of a ship is used as an example for explanation, and the principle of the stern bearing wear monitoring system applied to other types of equipment is the same as that applied to bearing monitoring of the stern shaft of a ship.

[0020] See also Figure 1 , Figure 1 This is a schematic structural diagram of a stern bearing wear monitoring system in one embodiment of the present invention. The stern bearing wear monitoring system includes a base 100, a slat 200, and an ultrasonic monitoring device 400. The slat 200 has a mounting surface attached to the base 100 and a support surface supporting the stern shaft 300. The ultrasonic monitoring device 400 includes a probe 410 and a processor 420. The probe 410 is connected to the mounting surface or extends into the slat 200. The probe 410 is used to transmit an excitation signal to the support surface and receive a reflected signal. The processor 420 is communicatively connected to the probe 410 and calculates the distance between the probe 410 and the support surface based on the excitation signal and the reflected signal.

[0021] In this embodiment, the stern bearing wear monitoring system provided by the present invention has the following advantages: slats 200 are used to support the stern shaft 300. As slats 200 are used, the supporting surface of slats 200 gradually wears. Since probe 410 is connected to the mounting surface or extends into slats 200, probe 410 can transmit an excitation signal and receive a reflected signal. Processor 420 can calculate the distance between probe 410 and the supporting surface based on the excitation signal and the reflected signal, thereby assessing the degree of wear of the slats. Because probe 410 of the present application does not come into contact with external seawater, it can prevent seawater from corroding probe 410 and also prevent the impact of surges on measurement results, thereby improving the stability and accuracy of the stern bearing wear monitoring system.

[0022] In some embodiments, the probe 410 includes a flexible housing 411, an excitation module 412, and a receiving module 413. The outer wall of the flexible housing 411 presses against the slat 200. The excitation module 412 and the receiving module 413 are both built into the flexible housing 411 and press against the inner wall of the flexible housing 411. The excitation module 412 is used to transmit an excitation signal, and the receiving module 413 is used to receive a reflected signal. In this embodiment, the outer wall of the flexible housing 411 presses against the slat 200, while the excitation module 412 and the receiving module 413 press against the inner wall of the flexible housing 411. Because the flexible housing 411 has a certain degree of deformation ability, as long as the slat 200 applies a certain pressure to the flexible housing 411, the flexible housing 411 can be deformed, and the slat 200 can be tightly fitted to the flexible housing 411. Similarly, by applying a certain amount of pressure to the flexible housing 411 by the excitation module 412 and the receiving module 413, the flexible housing 411 can be deformed, thereby making the flexible housing 411 fit tightly against the excitation module 412 and the receiving module 413. Because the flexible housing 411 fits tightly against the slats 200, the excitation module 412, and the receiving module 413, the effect of clearance on the propagation of sound waves can be avoided.

[0023] It is understood that the material of the flexible housing 411 needs to be conducive to the transmission of sound waves. In some embodiments, the flexible housing 411 includes a flexible metal housing. On the one hand, metal has good flexibility and ductility, which is conducive to filling the fitting gap. On the other hand, metal has a high density, which is conducive to the transmission of sound waves.

[0024] It should be emphasized that most metals have relatively good ductility. The specific material selection of the flexible metal shell needs to be selected according to the material of the slat 200. In principle, as long as the hardness is less than the hardness of the slat 200, when the flexible metal shell and the slat 200 are squeezed against each other, the flexible metal shell can be forced to deform without losing the slat 200.

[0025] In some embodiments, based on the above embodiments, a mounting surface defines a mounting groove 210, into which a flexible shell 411 is embedded. Because the flexible shell 411 is embedded in the mounting groove 210, the mounting groove 210 can be used to position the flexible shell 411, making it more stable and preventing vibration caused by the rotation of the stern shaft 300 from causing shaking of the flexible shell 411. Furthermore, the flexible shell 411 extends into the slats 200, increasing the contact area between the flexible shell 411 and the slats 200 and facilitating the transmission of acoustic signals between the flexible shell 411 and the slats 200.

[0026] It should be noted that, in order to make the flexible housing 411 more stable, in some embodiments, the probe 410 further includes a plurality of connecting pins 414, one end of each of which is connected to the flexible housing 411, and the other end of each of which is connected to the slats 200 and / or the base 100. The connecting pins 414 can be used to fix the flexible housing 411 to either the slats 200 or the base 100, thereby assisting in fixing the flexible housing 411.

[0027] Based on the above embodiments, in some embodiments, a plurality of connecting pins 414 are arranged along the circumference of the flexible shell 411. Arranging the connecting pins 414 along the circumference of the flexible shell 411 can support the flexible shell 411 from all directions, further improving the stability of the flexible shell 411.

[0028] In some embodiments, the probe 410 further includes a signal conditioning module 415, the excitation module 412 is communicatively connected to the receiving module 413, and the signal conditioning module 415 is communicatively connected to the receiving module 413 and Processor 420.

[0029] It should be noted that the excitation module 412 is used to generate an excitation signal, and the receiving module 413 is used to receive a reflection signal. The received reflection signal is conditioned by the signal conditioning module 415 and then fed back to the processor 420 .

[0030] In order to more clearly understand the working principle of the probe 410, a specific embodiment of the probe 410 is used for explanation: The excitation module 412 includes a first coil through which a high-frequency excitation current flows and a magnet capable of generating a static bias magnetic field. The receiving module 413 includes a second coil. The conditioning module includes an A / D converter 4151 and a conditioner 4152. The first coil can generate a dynamic magnetic field to induce eddy currents on the surface of the slat 200. The eddy currents induced on the surface of the slat 200 and the static bias magnetic field jointly generate ultrasonic waves inside the slat 200. Since the acoustic impedance of the lubricating medium is greater than that of the slat 200, the ultrasonic waves are reflected back when they reach the interface with the lubricating medium. Therefore, the ultrasonic waves can be reflected back and forth in the slat 200 many times, and the echo signal is received by the second coil of the transducer. The signal generated by the second coil is processed by the A / D converter 4151 and the conditioner 4152 in turn and then passed to the processor 420. The processor 420 collects the time difference t between the two echoes based on the time it takes for the ultrasonic wave to reciprocate on the slat 200. n , and then calculate the thickness of the slat 200, and then display the wear status of the slat 200 in real time.

[0031] The thickness of the slat 200 is calculated as follows:

[0032] Where: d represents the thickness of the material to be tested, and v represents the propagation speed of the ultrasonic wave in the material to be tested.

[0033] In some embodiments, the base 100 defines a mounting hole 110 that communicates with the strip 200, and the signal conditioning module 415 is built into the mounting hole 110. The mounting hole 110 provides a space for the signal conditioning module 415, thereby allowing the signal conditioning module 415 to be hidden within the mounting hole 110, thereby preventing the signal conditioning module 415 and related wires from being damaged by collision.

[0034] In some embodiments, based on the above embodiments, the base 100 further includes a sealing gasket 120, which is detachably mounted on the mounting hole 110. By sealing the mounting hole 110 with the sealing gasket 120, external seawater or oil can be prevented from entering the mounting hole 110, thereby providing a sealed protection for the signal conditioning module 415.

[0035] Furthermore, the present invention provides a ship comprising the above-mentioned stern bearing wear monitoring system.

[0036] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail: The stern bearing wear monitoring system provided by the present invention has the following advantages: the slats 200 are used to support the stern shaft 300. As the slats 200 are used, the supporting surface of the slats 200 will gradually wear out, causing the outer wall of the flexible shell 411 to press against the slats 200, while the excitation module 412 and the receiving module 413 press against the inner wall of the flexible shell 411. Because the flexible shell 411 has a certain degree of deformation, as long as the slats 200 apply a certain amount of pressure to the flexible shell 411, the flexible shell 411 can be deformed, thereby allowing the slats 200 to fit tightly against the flexible shell 411. Similarly, applying a certain amount of pressure to the flexible shell 411 by the excitation module 412 and the receiving module 413 can also force the flexible shell 411 to deform, thereby allowing the flexible shell 411 to fit tightly against the excitation module 412 and the receiving module 413. The first coil of the excitation module 412 generates a dynamic magnetic field, which in turn induces eddy currents on the surface of the slat 200. The eddy currents induced on the surface of the slat 200, combined with the static bias magnetic field, generate ultrasonic waves within the slat 200. Because the acoustic impedance of the lubricating medium is greater than that of the slat 200, the ultrasonic waves are reflected back when they reach the interface with the lubricating medium. Therefore, the ultrasonic waves can be reflected back and forth within the slat 200 multiple times, and the echo signals are received by the second coil of the transducer. The signal generated by the second coil is then processed by the A / D converter 4151 and the conditioner 4152, and then passed to the processor 420. The processor 420 collects the time difference t between the two echoes based on the time it takes for the ultrasonic wave to reciprocate on the slat 200. n , and then calculate the thickness of the slats 200, thereby displaying the wear status of the slats 200 in real time. Because the probe 410 of the present application does not come into contact with the external seawater, it can prevent seawater corrosion on the probe 410 and also prevent the impact of surges on the measurement results, thereby improving the stability and accuracy of the stern bearing wear monitoring system.

[0037] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise expressly 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 integral 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 internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] It should be noted that, in this application, relational terms such as "first" and "second" are used only 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 terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0039] The above specific embodiments of the present invention do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A stern bearing wear monitoring system, characterized in that: It includes: base; a slat having a mounting surface attached to the base and a support surface for supporting the stern shaft; as well as An ultrasonic monitoring device includes a probe and a processor. The probe is connected to the mounting surface or extends into the slat and is used to transmit an excitation signal to the support surface and receive a reflected signal. The processor is communicatively connected to the probe and calculates the distance between the probe and the support surface based on the excitation signal and the reflected signal.

2. The stern bearing wear monitoring system according to claim 1, characterized in that: The probe includes a flexible shell, an excitation module and a receiving module. The outer wall of the flexible shell presses against the slat. The excitation module and the receiving module are both built into the flexible shell and press against the inner wall of the flexible shell. The excitation module is used to emit an excitation signal, and the receiving module is used to receive a reflected signal.

3. The stern bearing wear monitoring system according to claim 2, characterized in that: The mounting surface is provided with a mounting groove, and the flexible shell is embedded in the mounting groove.

4. The stern bearing wear monitoring system according to claim 3, characterized in that: The probe further comprises a plurality of connecting pins, one end of each connecting pin being connected to the flexible shell and the other end of each connecting pin being connected to the slats and / or the base.

5. The stern bearing wear monitoring system according to claim 4, characterized in that: A plurality of connecting pins are arranged along the circumference of the flexible shell.

6. The stern bearing wear monitoring system according to claim 2, characterized in that: The probe further includes a signal conditioning module, the excitation module is communicatively connected to the receiving module, and the signal conditioning module is communicatively connected to the receiving module and the processor respectively.

7. The stern bearing wear monitoring system according to claim 6, characterized in that: The base is provided with a mounting hole communicating with the slats, and the conditioning module is built into the mounting hole.

8. The stern bearing wear monitoring system according to claim 7, characterized in that: The base further comprises a sealing gasket, and a detachable cover of the sealing gasket is arranged on the mounting hole.

9. The stern bearing wear monitoring system according to claim 2, characterized in that: The flexible shell includes a flexible metal shell.

10. A ship, characterized in that: It comprises the stern bearing wear monitoring system according to any one of claims 1 to 9.

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