A device for measuring the remaining effective diameter of an anchor chain and a method for evaluating its use.

Abstract

This invention relates to a device for measuring the remaining effective diameter of an anchor chain and a method for evaluating its use. The device includes a narrow, flexible diameter gauge that connects to a diameter gauge slide hole in a slider, and a depth gauge that connects to a depth gauge slide hole in the slider. After assembly, the movement of the slider on the diameter gauge and the movement of the depth gauge on the slider are independent of each other. This invention can measure narrow areas where anchor chain rings are nested together. The tight fit between the anchor chain round steel and the measuring device improves measurement accuracy and reduces measurement errors at bending points of the anchor chain round steel. The measuring device fits the remaining diameter of the anchor chain ring based on the actual remaining perimeter of the anchor chain ring cross-section, providing a more reliable result than directly measuring the average of the maximum and minimum diameters of the anchor chain ring. By using the actual remaining diameter and unfavorable factors of remaining strength to equivalently determine the effective remaining diameter, the device provides higher confidence levels in both measurement results and the evaluation results of the remaining effective diameter. The measuring device is simple to operate, provides direct measurement results, requires fewer measurements, and has high data acquisition efficiency.

Description

Technical Field

[0001] This invention relates to a measuring device for deck machinery repair in ship repair, and more particularly to a device for measuring the remaining effective diameter of anchor chains and a method for evaluating its use. Background Technology

[0002] According to the ship outfitting design manual, the outfitting number N is calculated based on the ship's characteristics during the design phase. The outfitting number N corresponds to the specific anchor chain diameter and length. According to GB / T 549 "Electric Welded Anchor Chains," the diameter of anchor chains of the same specification is fixed. Furthermore, ship anchor chains are made of metal of considerable strength, and inevitably, during use, they are subjected to wear from seabed sediment and corrosion from seawater and the atmosphere, which reduces their strength. Additionally, during the deployment and retrieval of the anchor chain, contact and friction between the anchor chain links and the anchor lip, guide rollers, chain catchers, anchor winch chain wheels, etc., significantly reduces the roundness of the anchor chain's cross-section, increasing the roundness tolerance. When the remaining effective strength of a link in the anchor chain decreases to a critical value, the link or link needs to be replaced. According to Section 4(13) of Chapter 5 of Part 1 of the China Classification Society's "Rules for Classification of Steel Seagoing Ships", "Anchors and anchor chains shall be arranged and inspected to confirm their quantity and condition. Anchor chains shall be measured during the second and subsequent special inspections. If the average diameter of the most worn part of any chain link is found to be 12% or more less than the diameter specified in the rules, it shall be replaced." In actual engineering inspections, due to the uneven corrosion and wear of the round steel of the anchor chain links, it is difficult to find the maximum and minimum diameters during measurement. Furthermore, because the anchor chain links are rigid and nested, it is inconvenient to use rigid measuring tools such as vernier calipers or tape measures to measure the diameter, resulting in large measurement errors. In some narrow locations, rigid measuring tools cannot be used for measurement. Some anchor chain links are severely worn with a large cross-sectional roundness tolerance. To improve measurement accuracy, multiple measurements at the same location are required, resulting in low measurement efficiency and a large workload. In addition, the anchor chain links are corroded. General measuring tools measure the outer contour dimensions and cannot effectively measure the depth of pits, corrosion pits, etc. on the surface of the chain links. Locations with abrupt changes in local structure, such as pits and corrosion pits, are prone to stress concentration, which are the points where the anchor chain strength is severely lost and are vulnerable to damage after the anchor chain is stressed. Such locations should be fully considered when evaluating the effective remaining diameter of the anchor chain. Summary of the Invention

[0003] To address the problems of complex data collection and measurement accuracy of the average diameter of anchor chains during the assessment of the remaining effective diameter of anchor chain links, and the lack of sufficient consideration of the impact of pitting, corrosion, and other defects on the strength loss of anchor chain links during the evaluation of measurement results, this invention provides a device for measuring the remaining effective diameter of anchor chains and a method for its evaluation, in order to solve the above problems.

[0004] To solve the above problems, the present invention adopts the following technical solution: a device for measuring the remaining effective diameter of an anchor chain, comprising a diameter ruler, a slider, and a depth gauge, wherein the diameter ruler is a narrow and flexible ruler, the diameter ruler is connected to the diameter ruler slide hole in the slider, and the depth gauge is connected to the depth gauge slide hole in the slider; after assembly, the movement of the slider on the diameter ruler and the movement of the depth gauge on the slider are independent of each other.

[0005] Furthermore, the diameter ruler passes through the diameter ruler slide hole, and the width and thickness of the diameter ruler are matched with the accuracy level clearance between the width and height of the diameter ruler slide hole of the slider, so that the slider can slide smoothly on the diameter ruler without affecting the bending of the diameter ruler within the effective measurement diameter range.

[0006] Furthermore, the depth gauge passes through the depth gauge slide hole, and the width and thickness of the depth gauge are matched with the width and height of the depth gauge slide hole of the slider with a precision level clearance, so that the depth gauge can slide smoothly and steadily in the depth gauge slide hole.

[0007] Furthermore, the height of the tip of the depth gauge is the same as the height H of the slider, ensuring that when the tip of the depth gauge is aligned with the upper surface of the slider, the zero point of the depth gauge is aligned with the upper surface of the slider, and the scale value increases from bottom to top.

[0008] Furthermore, the diameter ruler is a type of diameter ruler based on the "GB / T 35095π ruler" standard for measuring the diameter of cylinders.

[0009] Furthermore, the diameter ruler consists of a main diameter ruler and a secondary diameter ruler. The diameter ruler has a diameter ruler scale engraved according to the principle of the national standard "GB / T35095π ruler". The width of the main diameter ruler, the width of the secondary diameter ruler, the thickness of the diameter ruler, the method of use, the reading principle, and the material are the same as "GB / T 35095π ruler".

[0010] Furthermore, the slider is composed of a slider body, a diameter ruler slide hole, and a depth ruler slide hole. The slider body is provided with a diameter ruler slide hole and a depth ruler slide hole, and the diameter ruler slide hole and the depth ruler slide hole are arranged perpendicular to each other.

[0011] Furthermore, the depth measuring rod consists of a depth measuring rod tip, a depth measuring rod main rod, and a depth measuring rod lug. The depth measuring rod main rod has a depth measuring rod tip at the lower end and a depth measuring rod lug at the upper end. The depth measuring rod main rod is engraved with depth measuring rod scale.

[0012] Furthermore, the material and machining precision of the slider and depth gauge are the same as those of the diameter gauge.

[0013] An evaluation method for measuring the remaining effective diameter of an anchor chain, employing an anchor chain remaining effective diameter measuring device, comprises the following steps:

[0014] Step 1: Select the anchor chain round steel of the anchor chain ring to be tested. Pass the diameter ruler through the part of the anchor chain round steel to be tested, and slide the slider to the deepest part of the anchor chain round steel surface where the pit is located.

[0015] Step 2: Tighten the diameter ruler to the reading position, then adjust the slider position again so that the tip of the depth gauge is directly opposite the deepest point of the pit in the anchor chain round steel. Push the depth gauge so that the tip of the depth gauge reaches the bottom of the pit in the anchor chain round steel.

[0016] Step 3: Keep the device in a tightened and taut state, read the equivalent profile diameter D1 on the diameter ruler, and read the maximum depth H1 on the depth measuring ruler;

[0017] Step 4: Calculate and evaluate the remaining effective diameter D of the anchor chain ring round steel, D = D1 - H1;

[0018] Step 5: Compare the measured effective diameter D with the minimum acceptable diameter D0 in the specification to determine whether the anchor chain link meets the requirements for continued use.

[0019] The present invention has the following beneficial effects:

[0020] 1. The measuring tool is a narrow, flexible ruler relative to the diameter of the anchor chain round steel, which can measure narrow areas where the anchor chain rings are nested together. The tight fit between the anchor chain round steel and the measuring device improves measurement accuracy and reduces measurement errors at the bending positions of the anchor chain round steel.

[0021] 2. The measuring device fits the remaining diameter of the anchor chain ring based on the actual remaining perimeter of the anchor chain ring cross-section, which is more reliable than the result obtained by directly measuring the average of the maximum and minimum diameters of the anchor chain ring. By using the actual remaining diameter and unfavorable factors for remaining strength to equivalently give the effective remaining diameter, the measurement results and the assessment results of the remaining effective diameter obtained by this device have higher confidence.

[0022] 3. This measuring device is simple to operate, provides direct measurement results, requires fewer measurements, and has high data acquisition efficiency. Attached Figure Description

[0023] Figure 1 This is the front view of the diameter ruler;

[0024] Figure 2 This is the front view of the slider;

[0025] Figure 3 This is a top view of the slider.

[0026] Figure 4 This is a side view of the slider.

[0027] Figure 5 This is the front view of the depth gauge.

[0028] Figure 6 This is a side view of the depth gauge.

[0029] Figure 7 This is a front view of the device;

[0030] Figure 8 This is a top view of the device;

[0031] Figure 9 This is a side view (AA view) of the device;

[0032] Figure 10 For use of measurement diagrams;

[0033] Figure 11 To use the measurement schematic diagram BB view;

[0034] Figure 12 For use of the measurement schematic diagram BB view, partial I magnified view;

[0035] Label Explanation: 1. Diameter Ruler; 11. Main Scale of Diameter Ruler; 12. Secondary Scale of Diameter Ruler; 13. Diameter Ruler Scale; 2. Sliding Block; 21. Sliding Block Body; 22. Diameter Ruler Slide Hole; 23. Depth Gauge Slide Hole; 3. Depth Gauge; 31. Depth Gauge Center; 32. Main Scale of Depth Gauge; 33. Depth Gauge Ear Handle; 34. Depth Gauge Scale; 4. Anchor Chain Round Steel to be Measured; 41. Anchor Chain Round Steel Corrosion Pits; B11. Width of Main Scale of Diameter Ruler; B12. Width of Secondary Scale of Diameter Ruler; L 11. Main scale length, L12. Vernier scale length, T11. Diameter scale thickness, H21. Slider height, H22. Diameter scale slide hole height, H23. Depth gauge slide hole height, B21. Slider width, B22. Diameter scale slide hole width, T22. Clearance, B23. Depth gauge slide hole width, T21. Slider thickness, H31. Depth gauge tip height, H32. Depth gauge main scale height, T3. Depth gauge thickness, B31. Depth gauge width. Detailed Implementation

[0036] The structures, proportions, sizes, etc., drawn in the accompanying drawings of this invention are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this invention can produce, should still fall within the scope of the technical content disclosed in this invention.

[0037] like Figure 7As shown in Figures 8 and 9, an anchor chain residual effective diameter measuring device of the present invention includes a diameter ruler 1, a slider 2, and a depth gauge 3. The diameter ruler 1 is a narrow and flexible ruler. The slider 2 is provided with a diameter ruler slide hole 22 and a depth gauge slide hole 23, and the diameter ruler slide hole 22 and the depth gauge slide hole 23 are arranged perpendicularly to each other. The diameter ruler 1 is connected to the diameter ruler slide hole 22 in the slider 2, and the depth gauge 3 is connected to the depth gauge slide hole 23 in the slider 2. After assembly, the movement of the slider 2 on the diameter ruler 1 and the movement of the depth gauge 3 on the slider 2 are independent.

[0038] Preferably, based on the "GB / T 35095 π ruler" standard for measuring the diameter of a cylinder, a diameter ruler 1 is provided. Diameter ruler 1 consists of a main diameter ruler 11 and a secondary diameter ruler 12. The diameter ruler scale 13 is marked according to the aforementioned national standard principle. The width of the main diameter ruler is B11, the width of the secondary diameter ruler is B12, and the thickness of the diameter ruler is T11. Its usage method, reading principle, and material are the same as the π ruler. For example... Figure 1 As shown.

[0039] Preferably, a slider 2 is provided, comprising a slider body 21, a diameter ruler slide hole 22, and a depth ruler slide hole 23. The slider height H21, the diameter ruler slide hole height H22, the depth ruler slide hole height H23, the slider width B21, the diameter ruler slide hole width B22, the depth ruler slide hole width B23, and the slider thickness T21 are all specified. The material and machining precision are the same as those of the diameter ruler 1. Figure 2 , 3 As shown in Figure 4.

[0040] Preferably, a depth gauge 3 is provided, comprising a depth gauge tip 31, a depth gauge main scale 32, and a depth gauge lug 33. The depth gauge tip 31 is located at the lower end of the depth gauge main scale 32, and the lug 33 is located at the upper end. Depth gauge graduations 34 are engraved on the depth gauge main scale 32. The depth gauge tip height H31, the depth gauge main scale height H32, and the depth gauge thickness T31 are all specified. The material and processing precision are the same as those of the diameter gauge 1. Figure 5 , 6 As shown.

[0041] Preferably, the diameter ruler 1 passes through the diameter ruler slide hole 22. The width B11 and thickness T1 of the diameter ruler are in a clearance fit with the width B22 and height H22 of the diameter ruler slide hole of the slider 2, ensuring a high precision level. This allows the slider 2 to slide smoothly on the diameter ruler 1 without affecting the bending of the diameter ruler 1 within its effective measurement diameter range. The depth gauge 3 passes through the depth gauge slide hole 23. The width B31 and thickness T3 of the depth gauge are in a clearance fit with the width B23 and height H23 of the depth gauge slide hole of the slider 2, ensuring a high precision level. This allows the depth gauge 3 to slide smoothly within the depth gauge slide hole. The height 31 of the depth gauge tip is the same as the height H21 of the slider, ensuring that when the depth gauge tip 31 is flush with the upper surface of the slider 2, the zero point of the depth gauge is flush with the upper surface of the slider 2, and the scale values ​​increase from bottom to top.

[0042] like Figure 10 As shown in Figures 11 and 12, the specific evaluation method for the use of this invention is as follows:

[0043] S1. Select the anchor chain round steel 4 of the anchor chain ring to be tested. The diameter ruler 1 passes through the part 4 of the anchor chain round steel to be tested, and the slider 2 slides to the position of the deepest anchor chain round steel corrosion pit 41 on the surface of the anchor chain round steel.

[0044] S2. Tighten the diameter ruler 1 to the reading position, and adjust the position of the slider 2 again so that the tip 31 of the depth gauge is directly facing the deepest part of the anchor chain round steel corrosion pit 41. Push the depth gauge 3 so that the tip 31 of the depth gauge reaches the bottom of the anchor chain round steel corrosion pit 41.

[0045] S3. Keep the tightened and topped state, read the equivalent profile diameter D1 on the diameter ruler 1, and read the maximum depth H1 on the depth measuring ruler 3;

[0046] S4. Calculate and evaluate the remaining effective diameter D of the anchor chain ring round steel 4, D = D1 - H1;

[0047] S5. Compare the measured effective diameter D with the minimum acceptable diameter D0 in the specification to determine whether the anchor chain link meets the requirements for continued use.

Claims

1. A device for measuring the remaining effective diameter of an anchor chain, characterized in that: The device includes a diameter gauge, a slider, and a depth gauge. The diameter gauge is a narrow, flexible gauge that mates with a diameter gauge slide hole in the slider. Similarly, the depth gauge mates with a depth gauge slide hole in the slider. After assembly, the movement of the slider on the diameter gauge and the movement of the depth gauge on the slider are independent. This measuring device, with its narrow, flexible gauge relative to the diameter of the anchor chain round steel, is used to measure narrow areas where anchor chain rings are nested. During measurement, the measuring device fits tightly against the anchor chain round steel to improve measurement accuracy and reduce measurement errors at bending points. The diameter gauge passes through the diameter gauge slide hole, and the width and thickness of the diameter gauge are matched with the width and height of the diameter gauge slide hole in the slider using a precision clearance. The slider can... The depth gauge slides smoothly and steadily on the diameter gauge without affecting its bending within the effective measurement diameter range. The depth gauge passes through a depth gauge slide hole, and the width and thickness of the depth gauge are matched with the accuracy level clearance between the width and height of the depth gauge slide hole on the slider. The depth gauge can slide smoothly and steadily within the depth gauge slide hole. The slider consists of a slider body, a diameter gauge slide hole, and a depth gauge slide hole. The slider body has both diameter gauge and depth gauge slide holes, which are arranged perpendicularly to each other. The equivalent profile diameter D1 is read on the diameter gauge, and the maximum depth H1 is read on the depth gauge. The remaining effective diameter D of the anchor chain ring round steel is calculated and evaluated, where D = D1 - H1.

2. The anchor chain remaining effective diameter measuring device according to claim 1, characterized in that: The height of the tip of the depth gauge is the same as the height H of the slider, ensuring that when the tip of the depth gauge is aligned with the upper surface of the slider, the zero point of the depth gauge is aligned with the upper surface of the slider, and the scale value increases from bottom to top.

3. The anchor chain remaining effective diameter measuring device according to claim 1, characterized in that: The diameter ruler is a type of diameter ruler based on "GB / T 35095 π ruler" for measuring the diameter of a cylinder.

4. The anchor chain remaining effective diameter measuring device according to claim 1, characterized in that: The diameter ruler consists of a main diameter ruler and a secondary diameter ruler. The diameter ruler has a diameter ruler scale engraved according to the principle of the national standard "GB / T35095 π ruler". The width of the main diameter ruler, the width of the secondary diameter ruler, the thickness of the diameter ruler, the method of use, the reading principle, and the material are the same as "GB / T 35095 π ruler".

5. The anchor chain remaining effective diameter measuring device according to claim 1, characterized in that: The depth measuring rod consists of a depth measuring rod tip, a depth measuring rod main rod, and a depth measuring rod lug. The depth measuring rod main rod has a depth measuring rod tip at the lower end and a depth measuring rod lug at the upper end. The depth measuring rod main rod is engraved with depth measuring rod scale.

6. The anchor chain remaining effective diameter measuring device according to claim 1, characterized in that: The slider and depth gauge are made of the same material and have the same machining precision as the diameter gauge.

7. A method for measuring and evaluating the remaining effective diameter of an anchor chain, employing the anchor chain remaining effective diameter measuring device according to any one of claims 1-6, characterized in that, The steps are as follows: Step 1: Select the anchor chain round steel of the anchor chain ring to be tested. Pass the diameter ruler through the part of the anchor chain round steel to be tested, and slide the slider to the deepest part of the anchor chain round steel surface where the pit is located. Step 2: Tighten the diameter ruler to the reading position, then adjust the slider position again so that the tip of the depth gauge is directly opposite the deepest point of the pit in the anchor chain round steel. Push the depth gauge so that the tip of the depth gauge reaches the bottom of the pit in the anchor chain round steel. Step 3: Keep the device in a tightened and taut state, read the equivalent profile diameter D1 on the diameter ruler, and read the maximum depth H1 on the depth measuring ruler; Step 4: Calculate and evaluate the remaining effective diameter D of the anchor chain ring round steel, D = D1 - H1; Step 5: Compare the measured effective diameter D with the minimum acceptable diameter D0 in the specification to determine whether the anchor chain link meets the requirements for continued use.

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