An online monitoring device for the sinking and vibration of a ship's outboard tail shaft

Abstract

The present invention relates to the technical field of ship measurement equipment, and in particular to an online monitoring device for the sinking amount and vibration of a ship's outboard tail shaft. The online monitoring device provided by this application fills the gap in the existing online real-time monitoring means of the outboard tail shaft of a ship, and can replace the traditional manual mechanical measurement method to improve convenience and real-time performance; the functions are highly integrated, occupying less overall resources, and powerful, with functions such as wear amount, wear line type and tail shaft lateral vibration monitoring; the outboard measuring instrument has good corrosion resistance and pressure resistance, and can be used not only in civilian high-end ships and surface ships, but also in underwater submersibles and other fields; it can provide an effective means for preventive maintenance of ships, and also provide effective support for intelligent monitoring, operation and management of future ship propulsion systems.

Description

Technical Field

[0001] The invention relates to the technical field of ship measuring equipment, and in particular to an online monitoring device for sinking and vibration of a ship's outboard tail shaft. Background Art

[0002] The tail shaft is an important part of the ship's propulsion shaft system. The propeller is installed at the tail end, and the head end is connected to other shaft transmission equipment in the cabin through a coupling, which plays the role of transmitting the main engine torque and propeller thrust. Most of the tail shaft is located outboard and supported by a water-lubricated tail shaft bearing that is also located outboard. Due to the unbalanced amount of the rotating parts and the rotor dynamics of the concentrated mass-cantilever beam system formed by the propeller and the tail shaft, whirling (lateral) vibration will be generated when the propulsion shaft system is in operation, among which the tail end of the outboard tail shaft is one of the parts with the largest vibration amplitude. The shaft system whirling vibration will be transmitted to the hull structure through channels such as the shaft system and the tail shaft bearing, thereby inducing the vibration and acoustic radiation of the stern hull structure. In addition, the tail shaft bearing used to support the outboard tail shaft has poor working conditions. It uses seawater for lubrication and cooling, and is subjected to heavy loads, friction, and vibration impact. It may also face the invasion of foreign objects such as mud, marine organisms, and fishing nets, which are prone to abnormal wear and rapid wear, thus causing the tail shaft to sink, changing the load distribution characteristics of the shaft system and the working conditions of the tail shaft bearing, which has an adverse effect on the safe operation of the propulsion shaft system and the reliability of long-term work. Therefore, it is very necessary to conduct online monitoring of the sinking and vibration of the ship's outboard tail shaft.

[0003] However, since the monitored object is located outside the ship and the environmental conditions are harsh, it is difficult to set up effective online monitoring methods. In the prior art, two technical methods are generally used to measure the tail shaft sinking amount or tail shaft bearing wear. One method is to use a mechanical tail shaft sinking meter: the mechanical tail shaft sinking meter has a pin marked with a scale, which is passed through the sinking meter measurement hole reserved in the hull structure and the tail shaft bearing in advance, and the pin (or push rod) is pushed against the tail shaft. The sinking amount within a certain period is judged by the two measured values; this method needs to be measured during the ship's docking. Another method is for a diver to carry a measuring instrument at the dock and dive near the propeller to perform manual operation: this monitoring method is not automated enough and is extremely difficult to operate, resulting in low practicality. It is often in a "set up but not used" state when used on actual ships, resulting in insufficient grasp of the tail shaft sinking amount and the tail shaft bearing wear amount. Problems with the tail shaft sinking amount are often exposed only after an actual failure in the shaft system operation. As for the lateral vibration of the outboard tail shaft, it is generally difficult to monitor due to the difficulty in deploying outboard sensors, resulting in the lack of lateral vibration monitoring of the outboard tail shaft. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an online monitoring device for the sinking and vibration of the outboard tail shaft of a ship, which can monitor the sinking and lateral vibration of the outboard tail shaft of the ship online in real time, and has a small space occupation and high functional integration.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A device for monitoring the sinking and vibration of an outboard tail shaft of a ship, which is used to detect the sinking and lateral vibration of a tail shaft 5 of the ship. The propeller 1 of the ship is installed at the tail end of the tail shaft 5. The tail shaft 5 is supported by a front tail shaft bearing 7 and a rear tail shaft bearing 4. The front tail shaft bearing 7 and the rear tail shaft bearing 4 are both installed on a hull structure 3 outside the ship. The online monitoring device includes an outboard tail shaft sinking and vibration integrated measuring instrument 2, a pressure-resistant watertight cable 6 and a monitoring device host 8. The outboard tail shaft sinking and vibration integrated measuring instrument 2 is connected to the outboard tail shaft. It is installed on the rear end face of the tail shaft rear bearing 4 by bolts, one end of the pressure-resistant watertight cable 6 is connected to the pressure-resistant watertight connector on the top of the outboard tail shaft sinking and vibration integrated measuring instrument 2, and the other end is routed along the inner wall of the outboard hull structure of the ship, and is connected to the connector at the bottom of the monitoring device host 8 after entering the cabin through a through-cabin pipe. The monitoring device host 8 is installed in the ship's cabin, and is used to receive and process the monitoring data of the outboard tail shaft sinking and vibration integrated measuring instrument 2, and display it through the display screen integrated on the panel of the monitoring device host 8.

[0007] Furthermore, the outboard tail shaft sinking and vibration integrated measuring instrument 2 is internally provided with 5 integrated eddy current displacement sensors, namely: integrated eddy current displacement sensor 1#9, integrated eddy current displacement sensor 2#10, integrated eddy current displacement sensor 3#11, integrated eddy current displacement sensor 4#12, and integrated eddy current displacement sensor 5#13.

[0008] Furthermore, the integrated eddy current displacement sensor 3#11 is arranged at the top of the tester and coincides with the center line of the inner hole of the rear bearing 4 of the tail shaft in the vertical direction.

[0009] Furthermore, the integrated eddy current displacement sensor 2#10 and the integrated eddy current displacement sensor 4#12 are symmetrically arranged on the left and right sides of the integrated eddy current displacement sensor 3#11, respectively, and the angle α with the vertical center line is set in the range of 10° to 15°.

[0010] Furthermore, the integrated eddy current displacement sensor 1#9 and the integrated eddy current displacement sensor 5#13 are arranged in the upper half of the tester and are symmetrically arranged relative to the vertical center line. The angle β between the integrated eddy current displacement sensor 1#9 and the integrated eddy current displacement sensor 5#13 and the vertical center line is set to 45°.

[0011] Furthermore, the outboard tail shaft sinking and vibration integrated measuring instrument 2 adopts an annular flange structure as a whole, including an end cover 14, a pressure cover 15 and a measuring instrument housing, and the end cover 14 and the pressure cover 15 are both reserved with installation holes, cable lead grooves and fastener holes for the five integrated eddy current displacement sensors. A pressure-resistant watertight joint 16 is provided on the top of the measuring instrument housing, and the signal lines of the five integrated eddy current displacement sensors are gathered to the pressure-resistant watertight joint 16 through the cable lead groove and connected to the pressure-resistant watertight cable 6.

[0012] Furthermore, the end cover 14 and the gland 15 are both made of seawater-resistant engineering plastics and are integrally cast by a mold.

[0013] Furthermore, the monitoring device host 8 includes a box 17, a monitoring module 18, a status panel 19, an alarm indicator light 20, a switch knob 21 and a nameplate 22;

[0014] The box body 17 is made of magnesium-aluminum alloy, with ventilation and heat dissipation holes on the left and right sides, wiring holes at the bottom, and elastic vibration isolation installation at the back through a shock absorber;

[0015] The monitoring module 18 is reversely installed on the back plate of the box 17 using a plug-in structure. The monitoring module 18 integrates a power module, a communication management module, and a signal acquisition and conditioning module;

[0016] The status panel 19 is integrated with a display screen and a status indicator light;

[0017] The alarm indicator light 20 , the switch knob 21 and the nameplate 22 are all arranged on the front panel of the box body 17 .

[0018] Furthermore, the monitoring device host 8 is specifically installed in the ship cabin in a wall-mounted manner.

[0019] Compared with the prior art, the present invention has the following main advantages:

[0020] 1. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship of the present invention fills the gap of the existing online real-time monitoring means of the outboard tail shaft of a ship, and can replace the traditional manual mechanical measurement method, thereby improving convenience and real-time performance;

[0021] 2. The on-line monitoring device for sinking and vibration of the outboard tail shaft of a ship of the present invention has highly integrated functions, occupies less overall resources, has powerful functions, and has the functions of monitoring wear amount, wear line type and lateral vibration of the tail shaft;

[0022] 3. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship of the present invention has good corrosion resistance and pressure resistance performance of the outboard measuring instrument, and can be applied not only to high-end civilian ships and surface vessels, but also to underwater submersibles and other fields;

[0023] 4. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship of the present invention can provide an effective means for carrying out preventive maintenance of ships, and also provide effective support for the intelligent monitoring, operation and management of future ship propulsion systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure and installation of the on-line monitoring device for the sinking amount and vibration of the outboard tail shaft of a ship of the present invention;

[0025] Figure 2 It is a layout diagram of the internal sensors of the outboard tail shaft sinking and vibration integrated measuring instrument of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the outboard tail shaft sinking and vibration integrated measuring instrument of the present invention;

[0027] Figure 4 It is a schematic diagram of the end cover of the outboard tail shaft sinking and vibration integrated measuring instrument of the present invention;

[0028] Figure 5 It is a schematic diagram of the gland of the outboard tail shaft sinking and vibration integrated measuring instrument of the present invention;

[0029] Figure 6 It is a schematic diagram of a pressure-resistant watertight joint of the outboard tail shaft sinking and vibration integrated measuring instrument of the present invention;

[0030] Figure 7 It is a schematic diagram of the main structure of the outboard tail shaft sinking and vibration online monitoring device of the present invention.

[0031] In the figure: 1. propeller; 2. outboard tail shaft sinking and vibration integrated measuring instrument; 3. hull structure; 4. tail shaft rear bearing; 5. tail shaft; 6. pressure-resistant and watertight cable; 7. tail shaft front bearing; 8. monitoring device host; 9. integrated eddy current displacement sensor 1#; 10. integrated eddy current displacement sensor 2#; 11. integrated eddy current displacement sensor 3#; 12. integrated eddy current displacement sensor 4#; 13. integrated eddy current displacement sensor 5#; 14. end cover; 15. gland; 16. pressure-resistant and watertight joint; 17. box; 18. monitoring module; 19. status panel; 20. alarm indicator light; 21. switch knob; 22. nameplate. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0034] like Figure 1 As shown, an online monitoring device for the sinking and vibration of a ship's outboard tail shaft according to the present invention is composed of an outboard tail shaft sinking and vibration integrated measuring instrument 2, a pressure-resistant and watertight cable 6 and a monitoring device host 8; the objects of use involved are: a propeller 1, a hull structure 3, a tail shaft rear bearing 4 (or propeller bearing), a tail shaft 5 (or propeller shaft), and a tail shaft front bearing 7.

[0035] Among them, the position relationship of each component of the ship is as follows:

[0036] The propeller 1 of the ship is installed at the tail end of the tail shaft 5, which is located at the tail end of the hull structure 3. The propeller 1 and the tail shaft 5 are supported by a tail shaft front bearing 7 and a tail shaft rear bearing 4 located outboard and installed on the hull structure 3, wherein the tail shaft rear bearing 4 is also called a propeller bearing.

[0037] Among them, the working characteristics of various components of the ship are as follows:

[0038] When the ship is sailing, the propeller 1 and the tail shaft 5 are driven by the main engine to operate, and a friction pair is formed between the tail shaft 5 and the tail shaft front bearing 7 and the tail shaft rear bearing 4. Lubrication and cooling water are provided by the seawater outside the ship or the seawater system in the cabin. Due to the low viscosity of water, it is difficult to form a sufficient fluid dynamic lubrication film;

[0039] Since the propeller 1 is heavy and cantilever mounted, the load on the tail shaft rear bearing 4 is large and uneven, resulting in an edge load effect;

[0040] In addition, in order to control the vibration of the stern of the ship, the propulsion system of high-end civilian ships or military ships generally adopts a lower rated speed, resulting in a lower relative linear speed between the friction pair of the tail shaft rear bearing 4 and the tail shaft 5;

[0041] In summary, the working conditions between the tail shaft 5 and the tail shaft rear bearing 4 present the characteristics of low speed, heavy load, and unbalanced load, which will lead to the following problems:

[0042] First, it will cause the rear bearing 4 of the tail shaft to be prone to rapid wear and abnormal wear, thereby causing safety risks in the operation of the propulsion shaft system and unplanned docking maintenance, affecting the ship's sailing rate;

[0043] Second, it will cause the propulsion shaft system to induce low-speed abnormal friction noise at the rear bearing 4 of the tail shaft, thus affecting the quiet and stable operation of the propulsion shaft system. For ships, especially underwater vehicles, it will affect the navigation stealth;

[0044] Third, it will change the load distribution state and vibration characteristics of the propulsion shaft system, thereby affecting the propulsion shaft system and even the vibration and sound radiation characteristics of the stern of the ship, which is not conducive to the stern noise control of the ship.

[0045] By providing the ship outboard tail shaft sinking and vibration online monitoring device of the present invention, the sinking and lateral vibration of the tail shaft 5 can be monitored online in real time when the ship is sailing, which is beneficial to fully understand and predict the working status of the propulsion shaft system and carry out targeted preventive maintenance, thereby improving the safety, reliability and economy of the ship's navigation.

[0046] The present invention provides an on-line monitoring device for the sinking and vibration of a ship's outboard tail shaft, such as Figure 1 As shown, it is composed of an outboard tail shaft sinking and vibration integrated measuring instrument 2, a pressure-resistant watertight cable 6 and a monitoring device host 8;

[0047] Among them, the outboard tail shaft sinking and vibration integrated measuring instrument 2 is installed on the tail end face of the tail shaft rear bearing 4 by bolts; one end of the pressure-resistant watertight cable 6 is connected to the pressure-resistant watertight joint on the top of the outboard tail shaft sinking and vibration integrated measuring instrument 2, and is routed along the inner wall of the outboard hull structure of the ship, and enters the cabin through the through-cabin pipe 9, and the other end is connected to the joint at the bottom of the monitoring device host 8; after the monitoring device host 8 obtains the monitoring data, it performs necessary processing operations, and then displays the status on the display screen integrated on the panel of the monitoring device host 8. Through the above process, the collection, transmission, storage and display of the outboard monitoring signal are realized.

[0048] like Figure 2 As shown, the outboard tail shaft sinking and vibration integrated measuring instrument 2 internally integrates five integrated eddy current displacement sensors (1#, 2#, 3#, 4#, 5#);

[0049] Among them, the integrated eddy current displacement sensor 3# is arranged at the top, coinciding with the theoretical center line of the inner hole of the rear bearing 4 of the tail shaft in the vertical direction. The integrated eddy current displacement sensor 2# and the integrated eddy current displacement sensor 4# are respectively arranged on the left and right sides of the top of the integrated eddy current displacement sensor 3#, and are arranged symmetrically. The angle α between each sensor and the center line is set within the range of 10° to 15°; the integrated eddy current displacement sensor 1# and the integrated eddy current displacement sensor 5# are arranged in the upper half of the measuring instrument, symmetrically arranged along the theoretical center line of the inner hole of the rear bearing 4 of the tail shaft in the vertical direction, and the angle β between each sensor and the center line is set to 45°;

[0050] The integrated eddy current displacement sensor 1# and the integrated eddy current displacement sensor 5# arranged on the upper half of the tail shaft bearing 4 have an angle of 45° with the vertical center line, respectively, and can monitor the vibration displacement in two directions at the same time. Through Fourier transform, the displacement spectrum curves in two directions are obtained, and then the synthetic axis trajectory and each harmonic axis trajectory formed by the tail shaft vibration are obtained, so as to accurately grasp the vibration characteristics of the outboard propeller-tail shaft-bearing system when the shaft system is running, including parameters such as vibration displacement amplitude, characteristic frequency, axis trajectory, and axis center trajectory line during starting and stopping processes.

[0051] like Figures 3 to 6 As shown, the outboard tail shaft sinking and vibration integrated measuring instrument 2 adopts an annular flange structure as a whole, and is composed of an end cover 14, a gland 15, an integrated eddy current displacement sensor (1#, 2#, 3#, 4#, 5#), a pressure-resistant watertight joint 16 and fasteners;

[0052] Among them, the end cover 14 and the gland 15 are made of seawater-resistant engineering plastics and are integrally cast by a mold. The end cover 14 and the gland 15 are reserved with sensor installation and fixing holes, sensor cable lead grooves and fastener holes. After the five integrated eddy current sensors are installed and fixed to the end cover 14, the sensor cables are laid along the lead grooves, and the five-way sensor signal leads are combined and connected to the pressure-resistant watertight connector 16 on the top of the shell, and then the signal is connected to the monitoring device host 8 in the cabin through a watertight cable to realize the transmission of monitoring signals.

[0053] like Figure 7 As shown, the monitoring device host 8 is installed in the cabin of the ship, and can be wall-mounted, with the host panel facing the user. The monitoring device host 8 is composed of a box 17, a monitoring module 18, a status panel 19, an indicator light 20, a switch knob 21 and a nameplate 22;

[0054] Among them, the box body 17 is made of magnesium-aluminum alloy, with ventilation and heat dissipation holes on the left and right sides, wiring holes on the bottom, and shock absorbers on the back to achieve elastic vibration isolation installation; the monitoring module 18 adopts a plug-in structure and supports hot plugging with power on. The monitoring module 18 is reversely installed on the back plate of the box body 17. The monitoring module 18 is set according to the function of the monitoring device, and integrates a power module, a communication management module, a signal acquisition and conditioning module, etc. to realize power supply to the sensor and the host of the monitoring device, as well as data acquisition, processing and communication (internal communication and external communication); the status panel 19 can use a display screen to display the operating status of the monitored object in real time according to functional requirements, or use an indicator light to display the working status of each channel of the monitoring module in real time; the panel of the box body 17 is provided with an alarm indicator light 20 for displaying and alarming the working status of the monitoring device; the panel of the box body 17 is provided with a close knob 21 for starting and shutting down the monitoring device; the panel of the box body 17 is provided with a nameplate 22 for displaying the product logo.

[0055] Furthermore, through the integration of the above components, the online monitoring of the sinking amount and vibration of the ship's outboard tail shaft can be achieved.

[0056] Furthermore, the device for online monitoring of the sinking amount and vibration of the outboard tail shaft of a ship proposed in the present invention is specifically designed for the outboard part of the tail shaft which has the most severe operating conditions and environmental conditions. It can effectively solve the problems of backward monitoring means, poor convenience and real-time performance of the current outboard tail shaft of ships, assist in intelligent monitoring and management of ships, improve ship reliability, prevent the occurrence or deterioration of abnormal friction and abnormal vibration of the outboard tail shaft, prevent unplanned maintenance, and improve the ship's sailing rate.

[0057] In summary:

[0058] 1. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship of the present invention fills the gap of the existing online real-time monitoring means of the outboard tail shaft of a ship, and can replace the traditional manual mechanical measurement method, thereby improving convenience and real-time performance;

[0059] 2. The on-line monitoring device for sinking and vibration of the outboard tail shaft of a ship of the present invention has highly integrated functions, occupies less overall resources, has powerful functions, and has the functions of monitoring wear amount, wear line type and lateral vibration of the tail shaft;

[0060] 3. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship of the present invention has good corrosion resistance and pressure resistance performance of the outboard measuring instrument, and can be applied not only to high-end civilian ships and surface vessels, but also to underwater submersibles and other fields;

[0061] 4. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship of the present invention can provide an effective means for carrying out preventive maintenance of ships, and also provide effective support for the intelligent monitoring, operation and management of future ship propulsion systems.

[0062] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An on-line monitoring device for the sinking amount and vibration of a ship's outboard tail shaft, used for detecting the sinking amount and lateral vibration of a ship's tail shaft (5), wherein a propeller (1) of the ship is installed at the tail end of the tail shaft (5), and the tail shaft (5) is supported by a tail shaft front bearing (7) and a tail shaft rear bearing (4), and the tail shaft front bearing (7) and the tail shaft rear bearing (4) are both installed on a hull structure (3) outboard of the ship, characterized in that: The online monitoring device comprises an outboard tail shaft sinking and vibration integrated measuring instrument (2), a pressure-resistant watertight cable (6) and a monitoring device host (8); the outboard tail shaft sinking and vibration integrated measuring instrument (2) is installed on the rear end surface of the tail shaft rear bearing (4) by means of bolts; one end of the pressure-resistant watertight cable (6) is connected to a pressure-resistant watertight joint at the top of the outboard tail shaft sinking and vibration integrated measuring instrument (2); the other end is routed along the inner wall of the outboard hull structure of the ship, and is connected to a joint at the bottom of the monitoring device host (8) after entering the cabin through a through-cabin pipe; the monitoring device host (8) is installed in the ship cabin and is used to receive and process monitoring data of the outboard tail shaft sinking and vibration integrated measuring instrument (2), and display the data through a display screen integrated on the panel of the monitoring device host (8); The outboard tail shaft sinking and vibration integrated measuring instrument (2) is internally provided with five integrated eddy current displacement sensors, namely: integrated eddy current displacement sensor 1# (9), integrated eddy current displacement sensor 2# (10), integrated eddy current displacement sensor 3# (11), integrated eddy current displacement sensor 4# (12), and integrated eddy current displacement sensor 5# (13); The outboard tail shaft sinking and vibration integrated measuring instrument (2) adopts an annular flange structure as a whole, including an end cover (14), a gland (15) and a measuring instrument housing, the end cover (14) and the gland (15) are both reserved with installation holes, cable lead grooves and fastener holes for the five integrated eddy current displacement sensors, and a pressure-resistant watertight joint (16) is provided on the top of the measuring instrument housing, and the signal lines of the five integrated eddy current displacement sensors are gathered to the pressure-resistant watertight joint (16) through the cable lead groove and connected to the pressure-resistant watertight cable (6); The end cover (14) and the gland (15) are both made of seawater-resistant engineering plastics and are integrally cast by a mold.

2. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship according to claim 1, characterized in that: The integrated eddy current displacement sensor 3# (11) is arranged at the top of the tester and coincides with the vertical center line of the inner hole of the rear bearing (4) of the tail shaft.

3. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship according to claim 2, characterized in that: The integrated eddy current displacement sensor 2# (10) and the integrated eddy current displacement sensor 4# (12) are symmetrically arranged on the left and right sides of the integrated eddy current displacement sensor 3# (11), respectively, and the angle α with the vertical center line is set in the range of 10° to 15°.

4. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship according to claim 3, characterized in that: The integrated eddy current displacement sensor 1#(9) and the integrated eddy current displacement sensor 5#(13) are arranged in the upper half of the tester and are symmetrically arranged relative to the vertical center line. The angle β between the integrated eddy current displacement sensor 1#(9) and the integrated eddy current displacement sensor 5#(13) and the vertical center line is set to 45°.

5. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship according to claim 1, characterized in that: The monitoring device host (8) comprises a box (17), a monitoring module (18), a status panel (19), an alarm indicator light (20), a switch knob (21) and a nameplate (22); The box body (17) is made of magnesium-aluminum alloy, with ventilation and heat dissipation holes on the left and right sides, a wiring hole at the bottom, and an elastic vibration isolation installation at the back through a shock absorber; The monitoring module (18) is reversely installed on the back plate of the box (17) using a plug-in structure, and the monitoring module (18) integrates a power module, a communication management module, and a signal acquisition and conditioning module; The status panel (19) is integrated with a display screen and a status indicator light; The warning indicator light (20), the switch knob (21) and the nameplate (22) are all arranged on the front panel of the box body (17).

6. The device for online monitoring the sinking amount and vibration of the outboard tail shaft of a ship according to claim 5, characterized in that: The monitoring device host (8) is specifically installed in a ship cabin in a wall-mounted manner.

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