Tool and method for measuring tortuosity and offset of shafting flange without disc shaft

Abstract

The invention provides a tool and a method for measuring deflection and deviation of a shafting flange without a disc shaft. The tool comprises a positioning shaft pad, a positioning measuring plate, a first dial indicator and a second dial indicator. The positioning shaft pad and the positioning measuring plate are both of an L-shaped structure, the positioning shaft pad and the positioning measuring plate are connected through a locking bolt to form a semi-square-shaped tool body, an adjusting jackscrew is installed on the positioning shaft pad, and the first dial indicator and the second dial indicator are installed on the two sides of the positioning shaft pad respectively; according to the method, the construction period prolonged due to the installation integrity of the host is shortened, the influence of human factors in the measurement process is reduced, and the measurement precision is greatly improved; and the phenomena that the shaft system alignment result is influenced due to the fact that the shaft system flange is bent and the offset measurement precision is poor, and even the bearing high-temperature accident occurs in a serious situation are avoided.

Description

Technical Field

[0001] This invention relates to the field of shipboard alignment process tools, and in particular to tooling and measurement methods for measuring the bending and offset of shaft flanges without the need for a disc. Background Technology

[0002] The shafting system is a crucial component of a ship's propulsion system. Its function is to transmit the power generated by the main engine to the propeller, and in turn, to transmit the thrust generated by the propeller to the hull to propel the ship. The quality of the shafting system's installation and alignment directly affects the reliability of the propulsion system and the safety of the ship's navigation. Accurately measuring the bends and misalignments of the shafting connection flanges is a vital foundation for shafting alignment.

[0003] However, traditional methods for measuring the bending and offset of shaft flanges have many drawbacks:

[0004] 1. Measurement method using main engine turning gear and dial indicator: This method requires the main engine to provide power for turning gear to perform the measurement. However, the shaft flanges are not bolted together during the alignment stage, so it is not suitable for measuring the flanges of the intermediate shaft and propeller shaft. Furthermore, this measurement method is constrained by the integrity of the main engine, which will prolong the construction period and even cause delays in ship delivery.

[0005] 2. Measurement method using vernier calipers and feeler gauges: The measurement accuracy of this method is affected by the personal experience of the construction personnel. If the construction personnel are not experienced enough, their measurement accuracy will be inconsistent, which often leads to deviations in shaft alignment, affects bearing load distribution, and ultimately increases the load adjustment cycle. In severe cases, it may even cause bearing high temperature accidents during navigation. Summary of the Invention

[0006] This invention innovatively designs a measuring tool that does not require power from the main engine and is unaffected by the experience of construction personnel. It is applicable to the measurement of bending and offset of shafting flanges of different ship types, improves measurement accuracy, ensures the accuracy of shafting alignment, and reduces the probability of bearing overheating during ship operation.

[0007] This application proposes a tooling for measuring the bending and offset of a shaft flange without the need for a disc, including a positioning shaft pad, a positioning measuring plate, a first dial indicator, and a second dial indicator; the positioning shaft pad and the positioning measuring plate are both L-shaped structures, and the positioning shaft pad and the positioning measuring plate are connected by locking bolts to form a semi-U-shaped tooling body, an adjusting screw is installed on the positioning shaft pad, and the first dial indicator and the second dial indicator are respectively installed on both sides of the positioning shaft pad.

[0008] Furthermore, the positioning shaft pad and the positioning measuring plate are provided with elongated connecting holes. When the positioning shaft pad and the positioning measuring plate are connected by locking bolts, the position of the locking bolts can be adjusted according to different flange thicknesses to adapt to the measurement of flanges of different thicknesses.

[0009] Furthermore, the adjusting screws are distributed on both sides of the positioning shaft pad of the L-shaped structure.

[0010] Furthermore, the first dial indicator and the second dial indicator are respectively installed on both sides of the positioning shaft pad of the L-shaped structure, and the relative bending and offset between the flanges are measured by the first dial indicator and the second dial indicator.

[0011] The method for measuring the bending and offset of shaft flanges using the aforementioned fixture that does not require a disc for measurement includes the following steps:

[0012] Adjust the distance between the positioning shaft pad and the positioning measuring plate according to the thickness of the shaft flange, and lock them together with the locking bolts. Install the adjusting screws and dial indicator to obtain the tooling after installation.

[0013] Adjust the tooling using the adjusting screw to the appropriate position on the flange, adjust the position of the dial indicator, and lock the dial indicator with the locking screw, and then make the probe on the dial indicator contact the flange.

[0014] Starting from the top of the flange, move the measuring tool clockwise along the circumference and record the data every 90° to obtain 4 measurement data. The bending and offset values ​​of the shaft flange are obtained by processing the data.

[0015] Furthermore, the first dial indicator measures the relative offset and relative eccentricity between the flanges. The offset value between the two flanges is obtained by subtracting the 180° measurement value from the 0° measurement value and dividing by 2; the eccentricity value between the two flanges is obtained by subtracting the 270° measurement value from the 90° measurement value and dividing by 2.

[0016] The second dial indicator measures the relative tortuosity between the flanges. The tortuosity of the two flanges is obtained by subtracting the 180° measurement value from the 0° measurement value.

[0017] The advantages and positive effects of this invention are:

[0018] This invention shortens the construction cycle caused by the lack of completeness of the main unit installation by using new tooling, reduces the influence of human factors in the measurement process, and greatly improves the measurement accuracy; it avoids the impact of poor measurement accuracy due to the bending or offset of the shaft flange, which affects the shaft alignment results and may even lead to high temperature accidents of the bearing in severe cases. Attached Figure Description

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0020] Figure 1 The main view of the tooling for measuring the bending and offset of a shaft flange without the need for a disc shaft, as provided in Embodiment 1 of the present invention;

[0021] Figure 2 This is a top view of the tooling for measuring the bending and offset of the shaft flange without the need for a disc shaft, as provided in Embodiment 1 of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] Example 1

[0025] like Figure 1-2 As shown, this embodiment provides a tooling for measuring the bending and offset of a shaft flange without the need for a disc, including a positioning shaft pad 1, a positioning measuring plate 2, a first dial indicator 3, and a second dial indicator 4; the positioning shaft pad and the positioning measuring plate are both L-shaped structures, and the positioning shaft pad and the positioning measuring plate are connected by locking bolts 5 to form a semi-U-shaped tooling body, an adjusting screw 6 is installed on the positioning shaft pad, and the first dial indicator and the second dial indicator are respectively installed on both sides of the positioning shaft pad.

[0026] The positioning shaft pad and the positioning measuring plate are provided with elongated connecting holes. When the positioning shaft pad and the positioning measuring plate are connected by locking bolts, the position of the locking bolts can be adjusted according to different flange thicknesses to adapt to the measurement of flanges of different thicknesses.

[0027] The adjusting screws are distributed on both sides of the positioning shaft pad of the L-shaped structure. The adjusting screws can adjust the contact position between the tooling and the shaft end flange to ensure the accuracy of the tooling measurement data.

[0028] This embodiment focuses on the propeller shaft flange and intermediate shaft flange, which are the most difficult to measure due to their bending and offset characteristics. The measurements are taken from the main view (attached). Figure 1 ), side view (attached) Figure 2The tooling is shown in detail from two directions; the first dial indicator and the second dial indicator are respectively installed on both sides of the positioning shaft pad of the L-shaped structure, and the relative bending and offset between the propeller shaft flange 7 and the intermediate shaft flange 8 are measured by the first dial indicator and the second dial indicator.

[0029] Using this fixture to measure the bending and offset of the shaft flange shortens the construction cycle that was extended due to the integrity of the main machine installation, reduces the influence of human factors during the measurement process, greatly improves the measurement accuracy, and reduces the probability of shaft loads caused by high bearing temperature due to measurement errors.

[0030] Example 2

[0031] The method for measuring the bending and offset of a shaft flange using the non-disc-based tooling described in Example 1 includes the following steps:

[0032] First, adjust the distance between the positioning shaft pad and the positioning measuring plate according to the thickness of the shaft flange, and then tighten them by connecting and locking the bolts. Install the adjusting screws and dial indicator to obtain the tooling after installation.

[0033] Adjust the tooling using the adjusting screw to the appropriate position on the flange, adjust the position of the dial indicator, and lock the dial indicator with the locking screw 9, and make the probe on the dial indicator contact the flange.

[0034] Starting from the top of the flange, move the measuring tool clockwise along the circumference and record the data every 90° to obtain 4 measurement data. The bending and offset values ​​of the shaft flange are obtained by processing the data.

[0035] Specifically, the first dial indicator measures the relative offset and relative eccentricity between the propeller shaft flange and the intermediate shaft flange. The offset value between the two flanges is obtained by subtracting the 180° measurement value from the 0° measurement value and dividing by 2; the eccentricity value between the two flanges is obtained by subtracting the 270° measurement value from the 90° measurement value and dividing by 2.

[0036] The second dial indicator measures the relative torsional value between the propeller shaft flange and the intermediate shaft flange. The torsional value between the two flanges is obtained by subtracting the 180° measurement value from the 0° measurement value.

[0037] After the bending and offset of the shaft flanges meet the alignment process requirements, the shaft load is measured. If the calculated value does not meet the requirements of the shaft alignment process on water, temporary supports are needed to readjust the bending and displacement of the flange ends. If the calculated value meets the requirements (the tolerance for bending and offset of all flanges is ±0.05mm), the flanges of the propeller shaft and intermediate shaft, and the flanges of the intermediate shaft and the main engine are bolted together, and the shaft load is measured.

[0038] This invention presents an innovative adaptive dial gauge measurement method for measuring the bending and offset of shaft flanges without the need for manual rotation, particularly in the case of intermediate shaft propeller flanges where manual rotation is not possible. This tool is simple to operate, offers high measurement accuracy, reduces the risk of bearing overheating accidents during ship operation, and lowers daily maintenance costs.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tooling for measuring the bending and offset of shaft flanges without the need for a disc, characterized in that, It includes a positioning shaft pad, a positioning measuring plate, a first dial indicator, and a second dial indicator; the positioning shaft pad and the positioning measuring plate are both L-shaped structures, and the positioning shaft pad and the positioning measuring plate are connected by locking bolts to form a semi-U-shaped tooling body. Adjusting screws are installed on the positioning shaft pad, and the first dial indicator and the second dial indicator are respectively installed on both sides of the positioning shaft pad.

2. The tooling for measuring the bending and offset of shaft flanges without the need for a disc as described in claim 1, characterized in that: The positioning shaft pad and the positioning measuring plate are provided with elongated connecting holes. When the positioning shaft pad and the positioning measuring plate are connected by locking bolts, the position of the locking bolts can be adjusted according to different flange thicknesses to adapt to the measurement of flanges of different thicknesses.

3. The tooling for measuring the bending and offset of shaft flanges without the need for a disc as described in claim 1, characterized in that: The adjusting screws are distributed on both sides of the positioning shaft pad of the L-shaped structure.

4. The tooling for measuring the bending and offset of shaft flanges without the need for a disc as described in claim 1, characterized in that: The first dial indicator and the second dial indicator are respectively installed on both sides of the positioning shaft pad of the L-shaped structure, and the relative bending and offset between the flanges are measured by the first dial indicator and the second dial indicator.

5. A method for measuring the bending and offset of a shaft flange using the tooling described in any one of claims 1-4 that does not require a disc to measure the bending and offset of the shaft flange, characterized in that, Includes the following steps: Adjust the distance between the positioning shaft pad and the positioning measuring plate according to the thickness of the shaft flange, and lock them together with the locking bolts. Install the adjusting screws and dial indicator to obtain the tooling after installation. Adjust the tooling using the adjusting screw to the appropriate position on the flange, adjust the position of the dial indicator, and lock the dial indicator with the locking screw, and then make the probe on the dial indicator contact the flange. Starting from the top of the flange, move the measuring tool clockwise along the circumference and record the data every 90° to obtain 4 measurement data. The bending and offset values ​​of the shaft flange are obtained by processing the data.

6. The method for measuring the bending and offset of a shaft flange without the need for a disc as described in claim 5, characterized in that: The first dial indicator measures the relative offset and relative eccentricity between the flanges. The offset value between the two flanges is obtained by subtracting the 180° measurement value from the 0° measurement value and dividing by 2; the eccentricity value between the two flanges is obtained by subtracting the 270° measurement value from the 90° measurement value and dividing by 2. The second dial indicator measures the relative tortuosity between the flanges. The tortuosity of the two flanges is obtained by subtracting the 180° measurement value from the 0° measurement value.

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