Installation method for vibration sensors of underwater bearings outside the ship

Abstract

This invention discloses an installation method for a vibration sensor for an underwater bearing outside a ship, comprising the following steps: S1, machining a wedge-shaped bevel on the flange of the fairing; machining a U-shaped window at the mating point between the fairing and the signal cable of the vibration sensor; S2, welding the sensor base to the bearing outside the wedge-shaped bevel, and installing the vibration sensor on the sensor base using anti-loosening measures, so that the vibration sensor is embedded in the wedge-shaped bevel; S3, machining the cable protection conduit linearly according to the hull hull and welding it to the hull ...

Description

Technical Field

[0001] This invention relates to a sensor installation method, specifically to an installation method for a vibration sensor for an underwater bearing outside a ship. Background Technology

[0002] Vibration of underwater bearings outside the ship's hull is a parameter of great concern to ship designers and builders. Due to the operating environment, the technical requirements for installing vibration sensors near the ship's underwater rotating shaft system are high and challenging, mainly due to the need for high reliability and safety, and the requirement to consider pressure resistance, watertightness, signal cable protection, and penetration sealing in the operating environment.

[0003] There has long been a lack of mature solutions for the installation of underwater vibration sensors on shipboard surfaces, especially near rotating shaft systems. The installation of vibration sensors presents the following problems: 1. Vibration sensors may fall off, thereby affecting the operational safety of the shaft system; 2. The signal cables of vibration sensors may be damaged when passing through the cabin, resulting in unstable signals, with the signal sometimes being absent and sometimes not, affecting the safety of the ship.

[0004] Land-based vibration sensors can be installed using adhesives, bolts, etc., and the signal cables do not require special protection. Therefore, this method is unsuitable for installing underwater vibration sensors on shipboard surfaces. We urgently need a new installation method suitable for underwater bearing vibration sensors on shipboard surfaces. Summary of the Invention

[0005] The purpose of this invention is to provide an installation method for a vibration sensor for an underwater bearing outside the ship. This method uses an embedded installation method to install the vibration sensor near the underwater bearing outside the ship, which can prevent the vibration sensor from falling off. A special signal cable passing through the cabin protects the signal cable and prevents damage to the signal cable.

[0006] The technical solution adopted in this invention is:

[0007] A method for installing a vibration sensor for an underwater bearing outside a ship includes the following steps:

[0008] S1. Based on the external dimensions of the vibration sensor, a wedge-shaped bevel is machined on the guide flange for embedding the vibration sensor;

[0009] A U-shaped window is machined at the junction of the fairing and the signal cable of the vibration sensor to lead the signal cable out of the fairing to the outer plate of the hull.

[0010] S2. Weld the sensor base to the outboard bearing of the wedge bevel, and install the vibration sensor on the sensor base with anti-loosening measures so that the vibration sensor is embedded in the wedge bevel;

[0011] S3. Process and weld cable protection conduits that are consistent with the curved shape of the hull hull. Use segmented cable protection conduits where the curvature is large. After processing the cable protection conduits linearly according to the hull hull hull, weld them to the hull hull hull. After the signal cable passes through the U-shaped window of the flow guide, it passes through the cable protection conduit from bottom to top, and the signal cable is protected by cable protection measures.

[0012] S4. Weld the cup-shaped tube section to the hull plate at the cabin entrance. Pass the signal cable through the cup-shaped tube section from the outside and tighten the clamping bolts of the cup-shaped tube section to complete the entry of the signal cable into the cabin.

[0013] S5. Carry out painting operations and fairing reinstallation work.

[0014] According to the above scheme, in step S2, the anti-loosening measures include:

[0015] The first step in curing and preventing loosening is to apply an adhesive between the sensor base and the vibration sensor.

[0016] The second step in curing and preventing loosening is to apply thread-locking adhesive to the threaded joint between the sensor fastening bolts and the sensor base.

[0017] The third anti-loosening measure: Tighten the sensor fastening bolts to ensure a tight connection between the vibration sensor and the sensor base.

[0018] According to the above scheme, in step S2, the anti-loosening measures also include a fourth anti-loosening measure.

[0019] The fourth anti-loosening measure is to weld two wedge-shaped clamping blocks to the wedge-shaped bevel of the flow guide flange on both sides, and ensure that the wedge-shaped clamping blocks do not contact the sensor and the sensor fastening bolts to prevent damage to the vibration sensor due to overheating during welding.

[0020] According to the above scheme, the lower surface of the wedge-shaped clamping block is 2mm away from the sensor, and the front end of the wedge-shaped clamping block is 2mm away from the sensor fastening bolt.

[0021] According to the above scheme, in step S3, the cable protection measures include:

[0022] The first line of cable protection measures: use segmented cable protection conduits where the hull plating has a large curvature;

[0023] The second cable protection measure is to seal the lower end of the segmented cable protection conduit, pour in curing adhesive or foam from the top, and fill the segmented cable protection conduit completely to prevent the signal cable from moving relative to each other in the segmented cable protection conduit and being damaged.

[0024] According to the above scheme, in step S4, after tightening the clamping bolts of the cup-shaped pipe section, a water tightness test is performed on the cup-shaped pipe section.

[0025] After passing the test, epoxy resin is applied to the exposed parts of the signal cable to ensure a smooth transition between the cable protection conduit, cup-shaped pipe section and the ship's structural surface.

[0026] According to the above scheme, in step S1, the size of the wedge bevel near the shaft system end is smaller than the outer size of the vibration sensor, so as to secure the vibration sensor in the wedge bevel and prevent the vibration sensor from falling off and affecting the safe operation of the shaft system.

[0027] According to the above plan, the installation part of the vibration sensor is ground to make it flush with the plane of the outboard bearing, and to ensure that the outer contour of the vibration sensor does not affect the assembly of the fairing and the fairing flange.

[0028] According to the above scheme, in step S4, the cup-shaped pipe section is welded to the hull plate at the cabin entrance.

[0029] The beneficial effects of this invention are as follows:

[0030] By machining a wedge-shaped bevel on the fairing flange, vibration sensors are installed in an embedded manner to prevent them from falling off and to ensure the safe operation of the ship's underwater shafting system.

[0031] Multiple anti-loosening measures are implemented (through matching the installation location (wedge bevel on the fairing flange, U-shaped window on the fairing) and the shape of the vibration sensor; through embedded installation of the sensor to restrict some degrees of freedom of the sensor; through applying adhesive to the sensor base made of anti-corrosion material and the bottom surface of the sensor; tightening the bolts; applying adhesive to the bolt mating area; applying thread-locking adhesive to the threaded mating area between the sensor fastening bolts and the sensor base; and welding clamping wedge blocks to the structure), thereby further ensuring the vibration sensor is not detached and ensuring the safe operation of the ship.

[0032] By setting up cable protection conduits and cup-shaped pipe sections, the signal cables can be routed and passed through the cabin. The operation is very convenient, and this method protects the signal cables and prevents them from being damaged.

[0033] Multiple cable protection measures were implemented to protect the signal cables (by processing and welding cable protection conduits that conform to the curved shape of the hull hull; by filling the cable protection conduits with filler to prevent damage caused by vibration of the signal cables and cable protection conduits in high-vibration environments; and by applying curing material to the joints of the cable protection conduits to achieve a streamlined transition at the joints and prevent wear between the signal cables and the conduit joints), thus preventing damage to the signal cables and ensuring stable transmission of the signal cables.

[0034] Watertight installation of sensor signal cables is achieved by selecting watertight cup-shaped pipe sections made of materials that match the hull material;

[0035] This invention enables the vibration sensor to operate safely and reliably near a rotating shaft system;

[0036] The process is simple and easy to implement. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0038] Figure 1 This is a schematic diagram of the embedded installation of a vibration sensor;

[0039] Figure 2 yes Figure 1 The partial view of aa in the middle;

[0040] Figure 3 yes Figure 1 Partial sectional view of bb in the middle;

[0041] Figure 4 This is a schematic diagram illustrating the anti-loosening mechanism of the vibration sensor;

[0042] Figure 5 This is a schematic diagram of the second layer of cable protection for signal cables;

[0043] Figure 6 This is a diagram showing the signal cables running through the cabin;

[0044] In the diagram: 1. Vibration sensor, 2. Flood fairing, 3. Flood fairing flange, 4. Outboard bearing, 5. Shaft system, 6. Sensor fastening bolt, 7. Wedge clamping block, 8. Sensor base, 9. Adhesive, 10. Wedge bevel, 11. U-shaped window, 12. Cable protection conduit, 13. Curing adhesive or foam, 14. Signal cable, 15. Hull plate, 16. Cup-shaped pipe section, 17. Fastening adhesive. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the 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 merely illustrative and not intended to limit the invention.

[0046] See Figures 1-4 A method for installing a vibration sensor for an underwater bearing outside a ship includes the following steps:

[0047] Step 1:

[0048] See Figures 1-3A wedge-shaped bevel 10 is machined on the fairing flange 3 according to the external dimensions of the vibration sensor 1. The dimension of the end of the wedge-shaped bevel 10 near the shaft system 5 is smaller than the external dimensions of the vibration sensor 1, so that the vibration sensor 1 can be secured at the wedge-shaped bevel 10, preventing the vibration sensor 1 from falling off and affecting the safe operation of the shaft system 5. The mounting part of the vibration sensor 1 is ground to make the mounting part of the vibration sensor 1 flush with the plane of the outboard bearing 4, while ensuring that the outer contour of the vibration sensor 1 does not affect the assembly of the fairing 2 and the fairing flange 3. A partial cross-sectional view of the wedge-shaped bevel 10 formed by the cut-off part of the fairing flange 3 is shown below. Figure 3 ;

[0049] A U-shaped window 11 is machined at the mating point between the fairing 2 and the signal cable of the vibration sensor 1. This window is used to lead the signal cable 14 out of the fairing 2 to the hull plating. Figure 2 .

[0050] Step Two:

[0051] See Figure 4 The sensor base 8 is welded to the outer bearing 4 at the wedge bevel 10. Adhesive 9 is applied between the sensor base 8 and the vibration sensor 1 for the first curing and anti-loosening. Thread fastening adhesive 17 is applied to the threaded engagement between the sensor fastening bolt 6 and the sensor base 8 for the second curing and anti-loosening. The sensor fastening bolt 6 is tightened for the third anti-loosening.

[0052] Two wedge-shaped clamping blocks 7 are welded on both sides into the wedge-shaped bevel 10 of the flow guide flange 3. The size of the wedge-shaped clamping blocks 7 is based on being able to contact the sensor fastening bolt 6. The wedge-shaped clamping blocks 7 are kept from contacting the vibration sensor 1 and the sensor fastening bolt 6. The distance should be 2mm to prevent overheating during welding from damaging the vibration sensor 1. This measure also serves as the fourth anti-loosening measure.

[0053] Step 3:

[0054] See Figure 5 The cable protection conduit 12 is linearly machined according to the hull hull plate 15 and then welded to the hull hull plate 15. In areas with greater curvature, segmented cable protection conduits can be used; this is the first layer of cable protection. The signal cable 14 is passed through the cable protection conduit 12 from bottom to top. The lower end of the segmented cable protection conduit 12 is sealed, and the upper end is filled with curing adhesive or foam 13 to prevent relative movement of the signal cable 14 within the cable protection conduit 12 and damage to the signal cable 14; this is the second layer of cable protection.

[0055] Step Four:

[0056] See Figure 6The cup-shaped tube section 16 is welded to the cabin entrance of the hull plate 15 on both sides. The signal cable 14 passes through the cup-shaped tube section 16 from the outside. The length of the signal cable from the outside is appropriate. The clamping bolts of the cup-shaped tube section 16 are tightened to complete the entry of the signal cable 14 into the cabin.

[0057] After tightening, a water tightness test is conducted on the cup-shaped pipe section 16. After passing the test, epoxy resin is applied to the exposed parts of the signal cable 14 to make the signal cable 14 smoothly transition to the surface of the ship structure at the cable protection conduit 12, cup-shaped pipe section 16 and other parts, and to protect the signal cable 14. This is the third layer of cable protection.

[0058] Step 5:

[0059] After the epoxy resin has cured, paint application and reinstallation of the fairing are carried out.

[0060] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method of installation of a vibration sensor for a ship's outboard underwater bearing, characterised in that: It comprises the following steps: S1. A wedge-shaped groove is machined on the fairing flange according to the size of the vibration sensor for embedding the vibration sensor; A U-shaped window is machined at the signal cable fitting part of the fairing and the vibration sensor for leading the signal cable out of the fairing to the hull plate; S2. The sensor base is welded at the outboard bearing of the wedge-shaped groove, the vibration sensor is installed on the sensor base through anti-loosening measures, and the vibration sensor is embedded in the wedge-shaped groove; S3. A cable protection conduit is machined and welded according to the curve shape of the hull plate, segmented cable protection conduits are used at places with large curvature, the cable protection conduit is machined linearly according to the hull plate and then welded to the hull plate, the signal cable is passed through the U-shaped window of the fairing and then passed through the cable protection conduit from bottom to top, and the signal cable is protected through cable protection measures; S4. A cup-shaped pipe joint is welded at the hull plate access part, the signal cable is passed through the cup-shaped pipe joint from the outboard, and the signal cable is accessed by tightening the cup-shaped pipe joint; S5. Painting and fairing are performed.

2. A method of mounting a vibration sensor for a ship's outboard underwater bearing according to claim 1, characterised in that: In step S2, the anti-loosening measures include: The first solidified anti-loosening measure: adhesive is applied between the sensor base and the vibration sensor; The second solidified anti-loosening measure: thread locking glue is applied at the thread fitting part of the sensor fastening bolt and the sensor base; The third anti-loosening measure: the sensor fastening bolt is tightened to tightly connect the vibration sensor and the sensor base.

3. A method of mounting a vibration sensor for a ship's outboard underwater bearing according to claim 2, characterised in that: In step S2, the anti-loosening measures also include a fourth anti-loosening measure, The fourth anti-loosening measure is that two wedge-shaped compression blocks are double-sided welded in the wedge-shaped groove of the fairing flange, and it is ensured that the wedge-shaped compression blocks do not contact the sensor and the sensor fastening bolt to prevent damage to the vibration sensor caused by excessive welding heat.

4. A method of mounting a vibration sensor for a ship's outboard underwater bearing according to claim 3, characterised in that: The lower surface of the wedge-shaped compression block is 2mm away from the sensor, and the front end of the wedge-shaped compression block is 2mm away from the sensor fastening bolt.

5. A method of mounting a vibration sensor for use with a ship's outboard underwater bearing according to claim 1, characterised in that: In step S3, the cable protection measures include: The first cable protection measure: segmented cable protection conduits are used at places with large curvature of the hull plate; The second cable protection measure: the lower end of the segmented cable protection conduit is sealed, solidified glue or foam is poured into the upper end, and the segmented cable protection conduit is filled to prevent the signal cable from moving relatively in the segmented cable protection conduit and damaging the signal cable.

6. The installation method for the vibration sensor suitable for the outboard underwater bearing of a ship according to claim 5, characterized in that: In step S4, after the compression bolt of the cup-shaped pipe joint is tightened, a water tightness test is performed on the cup-shaped pipe joint part; After the test is passed, epoxy resin is applied to the exposed part of the signal cable to smoothly transition the cable protection conduit, the cup-shaped pipe joint part, and the surface of the ship structure.

7. The installation method for the vibration sensor suitable for the outboard underwater bearing of a ship according to claim 1, characterized in that: In step S1, the size of the wedge-shaped groove near the shaft end is smaller than the size of the vibration sensor to prevent the vibration sensor from falling off and affecting the safe operation of the shafting.

8. The installation method for the vibration sensor suitable for the outboard underwater bearing of a ship according to claim 1, characterized in that: The vibration sensor mounting part is polished to be flush with the outboard bearing plane and to ensure that the vibration sensor outer contour does not affect the assembly of the boss and boss flange.

9. The method for mounting a vibration sensor for a ship outboard underwater bearing according to claim 1, characterized in that: In step S4, the cup-shaped tube section is double-welded to the hull outer plate access opening part.

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