A method for measuring the wear of the intermediate bearing of a three-stern tube bearing

Abstract

The present invention provides a method for measuring the wear of an intermediate bearing of a three-stern tube bearing, comprising the following steps: S1, opening a measuring installation hole at the intermediate bearing of a stern tube bearing seat, such that the measuring installation hole passes through the tube wall of the stern tube; S2, controlling the liquid level of lubricating oil inside the stern tube to be below the outer diameter contour line of the bearing seat when detecting the wear of the intermediate bearing; S3, aligning and installing a measuring tool having a shape matching that of the measuring installation hole in step S1 in the measuring installation hole, and measuring the wear of the bearing.

Description

Technical Field

[0001] The present invention relates to the field of shipbuilding, and in particular to a method for measuring the wear of an intermediate bearing of a three-stern tube bearing. Background Art

[0002] Ships are able to sail in the water by using a power plant to drive the propeller to rotate in the water. The stern tube is a component in the ship's shafting system. It is fixed to the tail of the hull and is a pipe section equipped with sealing and supporting devices for the stern shaft to pass through. The propeller is connected to the power plant through the stern shaft.

[0003] When a ship is sailing, the stern tube bearing bears the uneven cantilever load caused by the propeller rotating in the water, the dynamic load caused by the shaft propeller hitting an obstacle, the additional vibration force that may occur during operation, and the weight load of the stern shaft or propeller shaft and its accessories. In addition, as the tonnage of the ship continues to increase, the stern shaft will bend under the action of the propeller, causing a huge edge load on the stern tube bearing, which makes the stern bearing always in an extremely poor lubrication working state, resulting in severe wear. At the same time, the reliability and service life of the stern tube bearing directly affect the safety of the ship's navigation and the economic efficiency of its operation. The amount of wear on the stern tube bearing is the basis for measuring whether the bearing can be used normally on the ship. Therefore, it is extremely important to detect the amount of wear on the ship's stern tube bearing during the shipbuilding stage and the ship's operation stage.

[0004] Testing the wear of a ship's stern tube bearings relies on specialized tools provided by professional manufacturers. These tools can only measure the wear of two stern tube bearings. For ships with three stern tube bearings, testing the wear of the middle bearing requires removing the propeller shaft.

[0005] However, for large ships, the removal of the propeller shaft is not only time-consuming and labor-intensive, but also very expensive. The cost of just one removal is hundreds of thousands of yuan. Since the service life of a ship is generally several decades, large ships generally need a major overhaul every 10 years. During the service life of the ship, at least three repairs are required. It is conservatively estimated that nearly one million yuan in removal costs can be saved. Summary of the Invention

[0006] Based on this, it is necessary to provide a method for measuring the wear of the intermediate bearing of the three-stern tube bearing without disassembly.

[0007] To solve the above technical problems, the present invention provides a method for measuring the wear of the intermediate bearing of a three-stern tube bearing, comprising the following steps:

[0008] S1. Opening a measuring installation hole at the middle bearing of the stern tube bearing seat, so that the measuring installation hole passes through the wall of the stern tube;

[0009] S2. When checking the wear of the intermediate bearing, control the lubricating oil level inside the stern tube below the outer diameter contour of the bearing seat;

[0010] S3, aligning and installing the measuring tool in step S1 that matches the shape of the measuring mounting hole in the measuring mounting hole to measure the wear of the bearing.

[0011] Preferably, the measuring mounting hole is a through hole, and the measuring mounting hole passes through the bearing seat.

[0012] Preferably, the inner wall of the measuring mounting hole is provided with an internal thread, the outer wall of the measuring tool is provided with an external thread, the shape of the measuring tool matches the shape of the measuring mounting hole, and during measurement, the measuring tool is fastened in the measuring mounting hole via the external thread.

[0013] Preferably, the internal thread includes an upper internal thread and a lower internal thread, the upper internal thread is located at the upper end of the measuring mounting hole, the lower internal thread is located at the lower end of the measuring mounting hole, and the upper plug is fixed in the measuring mounting hole through the upper internal thread.

[0014] Preferably, the upper cock is opened first, and then the measuring tool is installed in the measuring installation hole.

[0015] Preferably, after completing the measurement of the wear amount of the intermediate bearing, the measuring tool is rotated to remove the measuring tool, and then the measuring mounting hole is sealed using the upper plug, so that the intermediate bearing is in a sealed state.

[0016] Preferably, the inner diameter of the upper end of the measuring installation hole is larger than the maximum outer diameter of the measuring tool, and the inner diameter of the upper end of the measuring installation hole matches the outer diameter of the measuring tool.

[0017] Preferably, the measuring tool is a bearing wear measuring ruler, which includes a fixing seat, a sleeve and a ruler. The fixing seat is located at the bottom end of the sleeve, the ruler is inserted into the sleeve and passes through the fixing seat, and the ruler is movable in the sleeve and can move up and down.

[0018] Preferably, a locking seat is provided on the top of the sheath, the upper end of the scale passes through the locking seat, a bolt hole is provided on the locking seat, a locking bolt is inserted into the bolt hole, and the inner end of the locking bolt is in conflict with the outer wall of the scale, thereby fixing the scale.

[0019] Preferably, the outer wall of the fixing seat is provided with an external thread, and the measuring tool is fastened in the measuring mounting hole via the external thread.

[0020] The beneficial effects of the present invention are as follows: an installation position for a measuring tool is reserved during ship construction; at the same time, through the matching design of the measuring tool, the technical solution can solve the problem that the wear of the intermediate bearing of the three-stern tube bearing cannot be measured under the working condition of not dismantling the shaft. Under the working condition of not dismantling the shaft, direct bearing wear data support is obtained, thereby providing a direct basis for the ship to determine whether the bearing can be used normally. This solution makes the classification society's underwater inspection specifications more perfect, saves the cost of dismantling the propeller shaft, and facilitates regular inspection of the ship during and after construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the present invention will become more apparent by describing in more detail the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the accompanying drawings, and the drawings are not intentionally scaled to actual size, but rather are intended to illustrate the subject matter of the present invention.

[0022] Figure 1 This is a structural schematic diagram of a stern tube bearing seat with a measurement mounting hole according to a preferred embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a measuring tool according to a preferred embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the structure of a measuring tool according to a preferred embodiment of the present invention is shown;

[0025] Figure 4 A measurement diagram of a preferred embodiment of the present invention;

[0026] Figure 5 for Figure 1 A magnified schematic diagram of point A in the middle;

[0027] In the figure: bearing seat 1; intermediate bearing 2; measuring mounting hole 3; measuring tool 4; fixing seat 41; sleeve 42; ruler 43; locking seat 44; locking bolt 45; internal thread 5; upper internal thread 51; lower internal thread 52; external thread 6; upper plug 7; fixing seat 41, sleeve 42, ruler 43, locking seat 44, locking bolt 45, propeller shaft 9. DETAILED DESCRIPTION

[0028] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings.

[0029] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element. The terms "mounted", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] refer to Figure 1-5 The present invention provides a method for measuring the wear of the intermediate bearing of a three-stern tube bearing, comprising the following steps:

[0032] S1. Opening a measuring installation hole 3 at the middle bearing 2 of the stern tube bearing seat 1, so that the measuring installation hole 3 passes through the wall of the stern tube;

[0033] S2. When detecting the wear of the intermediate bearing 2, control the level of the lubricating oil inside the stern tube to be below the outer diameter contour of the bearing seat 1;

[0034] S3, aligning and installing the measuring tool 4 in step S1 that matches the shape of the measuring mounting hole 3 in the measuring mounting hole 3, and measuring the wear of the bearing.

[0035] The stern tube structure of the ship is as follows: the ship includes an outer hull wall, a power unit and a propeller shaft 9, the power unit is located on the inner side of the outer hull wall, the propeller is located on the outer side of the outer hull wall, the transmission shaft of the power unit is connected to the propeller through the propeller shaft, the outer hull wall is provided with a stern tube at the propeller, the propeller shaft is inserted in the stern tube, and the inner wall of the stern tube and the propeller shaft are rotatably connected through a stern tube bearing.

[0036] The stern tube bearing includes a front bearing, an intermediate bearing and a rear bearing, which are arranged in sequence. A measuring mounting hole is provided on the wall of the stern tube at the intermediate bearing, and the measuring mounting hole passes through the wall of the stern tube.

[0037] refer to Figure 1 、 Figure 4 and Figure 5 In a preferred embodiment, the measuring mounting hole 3 is a through hole, and the measuring mounting hole 3 passes through the bearing seat 1.

[0038] refer to Figure 5 In a preferred embodiment, the inner wall of the measuring mounting hole 3 is provided with an internal thread 5, and the outer wall of the measuring tool 4 is provided with an external thread 6. The shape of the measuring tool 4 matches the shape of the measuring mounting hole 3. During measurement, the measuring tool 4 is fastened in the measuring mounting hole 3 through the external thread 6.

[0039] refer to Figure 5In a preferred embodiment, the internal thread 5 includes an upper internal thread 51 and a lower internal thread 52, the upper internal thread 51 is located at the upper end of the measuring mounting hole 3, and the lower internal thread 52 is located at the lower end of the measuring mounting hole 3, and the upper plug 7 is fixed in the bearing seat 1 through the upper internal thread 51.

[0040] refer to Figure 1 and Figure 5 In a preferred embodiment, the upper cock 7 is opened first, and then the measuring tool 4 is installed in the measuring mounting hole 3.

[0041] refer to Figure 1 In a preferred embodiment, after completing the measurement of the wear amount of the intermediate bearing 2, the measuring tool 4 is rotated to remove the measuring tool 4 from the measuring mounting hole 3, and then the measuring mounting hole 3 is closed using the upper plug 7, so that the intermediate bearing 2 is in a sealed state.

[0042] refer to Figure 1 、 Figure 2 and Figure 5 In a preferred embodiment, the inner diameter of the upper end of the measuring mounting hole 3 is larger than the maximum outer diameter of the measuring tool 4 , and the inner diameter of the upper end of the measuring mounting hole 3 matches the outer diameter of the measuring tool 4 .

[0043] refer to Figure 2 and Figure 3 In a preferred embodiment, the measuring tool 4 is a bearing wear measuring ruler. The measuring tool 4 includes a fixing base 41, a sheath 42, and a scale 43. The fixing base 41 is located at the bottom end of the sheath 42. The scale 43 is inserted into the sheath 42 and passes through the fixing base 41. The scale 43 is movable within the sheath 42 and can move up and down. The outer cross-section of the measuring tool 4 is circular or polygonal. When the outer cross-section of the measuring tool 4 is polygonal, a regular hexagon is most preferred.

[0044] refer to Figure 2 and Figure 3 In a preferred embodiment, a locking seat 44 is provided on the top of the sheath 53, and the upper end of the scale 43 passes through the locking seat 44. A bolt hole is provided on the locking seat 44, and a locking bolt 45 is inserted into the bolt hole. The inner end of the locking bolt 45 contacts the outer wall of the scale 43, thereby fixing the scale 43.

[0045] refer to Figure 5 In a preferred embodiment, the outer wall of the fixing seat 41 is provided with an external thread 6 , and the measuring tool 4 is fastened in the measuring mounting hole 3 via the external thread 6 .

[0046] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0048] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for measuring the wear of the intermediate bearing of a three-stern tube bearing, characterized in that: The following steps are involved: S1. Opening a measuring installation hole at the middle bearing of the stern tube bearing seat, so that the measuring installation hole passes through the wall of the stern tube; S2. When checking the wear of the intermediate bearing, control the lubricating oil level inside the stern tube below the outer diameter contour of the bearing seat; S3. First, open the upper tap, then align and install the measuring tool in step S1 that matches the shape of the measuring mounting hole in the measuring mounting hole to measure the wear of the bearing. After completing the wear measurement of the intermediate bearing, remove the measuring tool, and then use the upper tap to seal the measuring mounting hole, so that the intermediate bearing is in a sealed state. In which, the measuring tool is a bearing wear measuring ruler, which includes a fixing seat, a sleeve and a ruler. The fixing seat is located at the bottom end of the sleeve, and the ruler is inserted in the sleeve and passes through the fixing seat. The ruler is movably inserted in the sleeve and can move up and down; the inner wall of the measuring mounting hole is provided with an internal thread, and the outer wall of the measuring tool is provided with an external thread matching the internal thread. The external thread is located at the outer wall of the fixing seat, and the fixing seat is fastened in the measuring mounting hole by the external thread. The internal thread includes an upper internal thread and a lower internal thread. The upper internal thread is located at the upper end of the measuring mounting hole, and the lower internal thread is located at the lower end of the measuring mounting hole. The upper plug is fixed in the bearing seat by the upper internal thread.

2. The method according to claim 1, wherein The inner diameter of the upper end of the measuring installation hole is larger than the maximum outer diameter of the measuring tool, and the inner diameter of the upper end of the measuring installation hole matches the outer diameter of the measuring tool.

3. The method according to claim 1, wherein A locking seat is provided on the top of the sheath, the upper end of the ruler passes through the locking seat, a bolt hole is provided on the locking seat, a locking bolt is inserted into the bolt hole, and the inner end of the locking bolt contacts the outer wall of the ruler, thereby fixing the ruler.

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