A method for measuring the coaxiality of couplings

Abstract

A method for measuring the coaxiality of a coupling includes the following steps: Step 1: Selecting multiple angular measuring surfaces on the flange of the driven half-coupling, and measuring the angular displacement at each first measuring point to obtain the angular displacement of all angular measuring surfaces; Step 2: Selecting multiple radial measuring surfaces on the outer circumference of the driven half-coupling, and measuring the radial displacement of each radial measuring surface to obtain the radial displacement of all radial measuring surfaces; Step 3: Comparing the angular displacement of all angular measuring surfaces and the radial displacement of all radial measuring surfaces, with the largest radial displacement or angular displacement representing the coaxiality of the coupling under test. This invention considers multiple influencing factors, resulting in accurate measurement results.

Description

Technical Field

[0001] This invention relates to an improvement in coupling coaxiality measurement technology, belonging to the field of coupling accuracy measurement, and particularly to a method for measuring coupling coaxiality. Background Technology

[0002] Couplings are divided into rigid couplings and flexible couplings. Rigid couplings do not have the ability to buffer or compensate for relative displacement of the shafts, so the two shafts must be strictly aligned. Flexible couplings, although they have a certain ability to buffer and compensate for relative displacement of the shafts, must still be within the compensation range allowed by the selected coupling.

[0003] Therefore, whether it is a rigid coupling or a flexible coupling, during the transmission of motion and torque, it is necessary to ensure that the alignment (i.e., coaxiality) of the driven half-coupling and the driving half-coupling is controlled within the permissible range. If the coaxiality of the two half-couplings exceeds the permissible range, it will lead to abnormal vibration of the two half-couplings and the machines at both ends of the connection, excessive bearing temperature rise or breakage, heat deformation and wear of seals, and other problems. However, the existing detection methods only detect the effect of radial displacement on coaxiality and do not take into account that angular displacement will also affect coaxiality, resulting in inaccurate measurement results.

[0004] Chinese patent application CN 202210450413.4, filed on April 26, 2022, discloses a highly applicable coaxiality measurement test bench for rotating parts, including a base plate and a straight rod. A detection assembly is fixedly installed on the top of the base plate. The detection assembly includes an electric push rod, which is fixedly installed on the top of the base plate. A dial indicator is fixedly installed at the output end of the electric push rod, and a contact rod is fixedly installed on the top of the dial indicator. A rotating body is fitted around the outside of a straight rod. Mounting frames are fixedly installed on the top left and right sides of the base plate. A limiting component that fits against the rotating body is fixedly installed around the outside of the straight rod. The limiting component includes a first limiting plate, which is fixedly installed around the outside of the straight rod and fits against the left side of the rotating body. A second limiting plate is fitted around the outside of the straight rod. A limiting cavity is formed inside the second limiting plate. A limiting block is slidably connected inside the limiting cavity. A limiting rod extending into and engaging with the inside of the straight rod is fixedly installed at the bottom of the limiting block. A pull rod extending to the top of the second limiting plate is fixedly installed at the top of the limiting block. A limiting spring fitted around the pull rod is fixedly installed between the limiting block and the inner top wall of the limiting cavity. However, the above solution does not solve the problem of inaccurate measurement results caused by only considering radial displacement.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this patent application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to overcome the problem in the prior art where only radial displacement is considered, leading to inaccurate measurement results. It provides a method for measuring the coaxiality of couplings that considers multiple influencing factors and yields accurate measurement results.

[0007] To achieve the above objectives, the technical solution of the present invention is: a method for measuring the coaxiality of a coupling, the method comprising the following steps:

[0008] Step 1: Select multiple angular measurement surfaces on the driven end half-coupling flange, and measure the angular displacement of each first measurement point to obtain the angular displacement of all angular measurement surfaces;

[0009] Step 2: Select multiple radial measuring surfaces on the outer circumference of the driven end half coupling, and measure the radial displacement of each radial measuring surface to obtain the radial displacement of all radial measuring surfaces.

[0010] Step 3: Compare the angular displacement of all angular measuring surfaces and the radial displacement of all radial measuring surfaces. The largest radial or angular displacement is the coaxiality of the coupling under test.

[0011] In step one, multiple angular measuring surfaces are selected on the driven end half-coupling flange, and the angular displacement is measured at each first measuring point to obtain the angular displacement of all angular measuring surfaces:

[0012] A. Using the outer circular cross-section of the driving end half-coupling as the reference plane, select multiple measurement surfaces on the outer circumference of the driven end half-coupling, measure the distance H1 between the highest point J1 of one of the measurement surfaces on the outer circumference of the driven end half-coupling and the reference plane O, and the distance H2 between the lowest point J11 and the reference plane O, and calculate the difference between the highest and lowest points.

[0013] B. Measure the diameter D1 of the outer circular surface of the driven end half-coupling flange and the diameter D2 of the outer cylindrical surface of the driven end half-coupling.

[0014] C. Draw a three-dimensional model based on the values ​​of D1, D2, the highest point and the lowest point, and then calculate the deflection angle α of the maximum flange face of the driven end half coupling based on the three-dimensional model;

[0015] D. Based on the deflection angle α of the maximum flange face of the driven end half-coupling, calculate the angular offset of the flange face of the driven end half-coupling under this test surface.

[0016] E. Calculate the angular offset corresponding to other surfaces to be measured according to the above steps, compare all the angular offsets, and the largest angular offset is the angular offset of the coupling to be measured.

[0017] Preferably, there are three measuring surfaces:

[0018] The midpoint of the outer circumference of the driven half-coupling along the generatrix direction is the first measuring surface;

[0019] The section near the flange of the driven half-coupling is the second measuring surface;

[0020] The section at the end of the driven half-coupling flange furthest from the driven end is the third measuring surface.

[0021] The first step involves measuring the distance H1 between the highest point J1 of one of the surfaces to be measured on the outer circumference of the driven half-coupling and the reference surface O, and the distance H2 between the lowest point J11 and the reference surface O. This includes the following steps:

[0022] A. Install the driven end half coupling onto the driven shaft;

[0023] B. The testing instrument is fixed on the outer circular surface of the driving end half coupling. After the dial indicator is zeroed, the probe is pressed against the outer circular surface of the driven end half coupling without any clearance.

[0024] C. Rotate the driven end half-coupling one revolution along the rotation center line, and record the highest and lowest points of the dial indicator during the one revolution.

[0025] D. Measure the reading S1 corresponding to the highest point A on the measurement surface, and measure the reading S2 corresponding to the lowest point B on the measurement surface;

[0026] The difference between the measured values ​​corresponding to the highest and lowest points: △H A =S1-S2.

[0027] The distance from the highest point A on the measuring surface to the center line of rotation is H1, and the distance from the lowest point B on the measuring surface to the center line of rotation is H2. The difference between H2 and H1 is: ΔH B =H2-H1; At this time, ΔH=ΔH A =△H B .

[0028] The angle α of the maximum flange face of the driven end half-coupling, calculated based on the three-dimensional model, is as follows:

[0029] The axial distance from the measuring point to the flange face of the driven half-coupling is L. Taking the rotation center line as the reference, the inclination angle of the maximum flange face of the driven half-coupling can be obtained by the following formula based on the geometric relationship between parameters L, D2, α, △H, H2 and H1.

[0030] H2=D2*cosα+L*sinα+D2*sinα*tgα;

[0031] H1 = D2*cosα - L*sinα;

[0032] At this time, △H = △H A =△H B =D2*tgα*sinα+2*L*sinα.

[0033] The calculation of the angular offset T of the driven end half-coupling flange face based on the deflection angle α of the maximum flange face of the driven end half-coupling is specifically as follows: Based on the geometric relationship between the angular offset T, the diameter D1 of the driven end half-coupling flange face, and the deflection angle α of the flange face, the following formula can be obtained: T=D1*sinα.

[0034] Step two involves selecting multiple radial measuring surfaces on the outer circumference of the driven end half-coupling, and measuring the radial displacement of each radial measuring surface to obtain the radial displacement of all radial measuring surfaces. Specifically:

[0035] Using the outer circular surface of the driving end half-coupling as a reference, select multiple radial measuring surfaces on the outer circumference of the driven end half-coupling. Measure the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven end half-coupling and the reference line O, and the distance G11 between the lowest point of D3 and the reference line O. G1 is the maximum radial runout, and G11 is the minimum radial runout. Calculate the difference between the maximum radial runout G1 and the minimum radial runout G11. The difference is the radial displacement of the coupling.

[0036] Calculate the radial displacement corresponding to other radial measuring surfaces according to the above steps, compare all radial displacements, and the largest radial displacement is the radial displacement of the coupling under test.

[0037] Multiple measurement points are selected equally along the generatrix direction on the outer circumference of the driven half-coupling.

[0038] Preferably, the intersection of the generatrix on the outer circumference of the driven half-coupling and the split surface is the first measuring point D1; the intersection of the section near the flange of the driven half-coupling and the generatrix is ​​the second measuring point D2; and the intersection of the section away from the end of the flange of the driven half-coupling and the generatrix is ​​the third measuring point D3.

[0039] The measurement of the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven end half-coupling and the reference line O, and the distance G11 between the lowest point of D3 and the reference line O, are specifically as follows:

[0040] Fix the testing instrument on the outer circular surface of the driving end half coupling. After zeroing the dial indicator, press the probe against the outer circular surface of the driven end half coupling without any clearance.

[0041] Rotate the driven shaft and the driven end half coupling one revolution along the rotation center line, and detect the radial runout of the measurement point on the outer circumference of the driven end half coupling during one revolution of the driven end half coupling, and record the maximum radial runout G1 and the minimum radial runout G11.

[0042] The calculation of the difference between the maximum radial runout G1 and the minimum radial runout G11 is specifically as follows:

[0043] △G = G1 - G11.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] 1. In the method for measuring the coaxiality of a coupling according to the present invention, multiple measuring points are equally divided along the generatrix direction on the outer circumference of the driven half-coupling. Using the outer circular surface of the driving half-coupling as a reference, the radial runout of multiple measurements along the same generatrix on the outer circular surface of the driven half-coupling is measured one by one. The radial displacement of the coupling is obtained by calculating the difference between the maximum and minimum radial runout. Simultaneously, measuring points are selected on the flange of the driven half-coupling, and the maximum clearance and minimum cross-sectional area between the driving and driven half-couplings are measured using the outer circular surface of the driving half-coupling as a reference. By using mathematical modeling and calculation, precise values ​​of the angular offset corresponding to multiple measuring surfaces of each grade of coupling can be obtained for each grade. The larger value is selected as the coaxiality of the coupling. By comprehensively considering the influence of radial and angular displacement on the coaxiality of the coupling, the coaxiality of the coupling can be measured more comprehensively and accurately. This helps ensure that the alignment of the two halves of the coupling is within the permissible range during the transmission of motion and torque, thereby avoiding problems such as abnormal vibration of the two halves of the coupling and the connected machines at both ends, excessive bearing temperature rise or breakage, and heat deformation and wear of seals caused by inaccurate coaxiality measurement. Therefore, this invention considers multiple influencing factors, and the measurement results are accurate.

[0046] 2. In the method for measuring the coaxiality of a coupling according to the present invention, multiple measuring surfaces are equally selected along the generatrix direction on the outer circumference of the driven half-coupling of the flexible coupling. Taking the outer circumference of the driving half-coupling as a reference, the difference between the highest and lowest points on each measuring surface of the driven half-coupling is detected one by one. This multi-measuring-surface sampling method can obtain more comprehensive angular offset information of the coupling. Through mathematical modeling and calculation, the angular offset corresponding to each measuring surface can be accurately obtained. This relative difference measurement method has high stability and is not affected by the slight absolute position of the measuring reference. The influence of fluctuations can more accurately reflect the angular offset of each measuring surface. After mathematical modeling and calculation, the angular offset of each measuring surface is obtained, ensuring the accuracy of the results. The maximum value among multiple angular offsets is selected as the angular offset of the coupling under test, because this maximum value better reflects the overall offset state of the coupling, avoiding misjudgments of the coupling's working state due to improper value selection. This achieves accurate measurement of the angular displacement of flexible couplings, solving the problem that the angular displacement of flexible couplings cannot be directly detected using conventional measuring tools. Therefore, the angular displacement measurement of this invention is convenient.

[0047] 3. In the method for measuring the coaxiality of couplings according to the present invention, the present invention does not require special or complex measuring equipment. It only uses the outer circular surface of the driving end half coupling as a reference and uses conventional measuring tools to measure the difference between the highest and lowest points. This method is easy for engineering technicians to master and implement. In addition, since there is no need to purchase expensive special measuring equipment, the measurement can be achieved using existing conventional measuring tools, thus reducing the measurement cost. Therefore, the present invention is simple to measure and has a low cost. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of radial displacement measurement in this invention.

[0049] Figure 2 This is a schematic diagram of the through hole structure in this invention.

[0050] Figure 3 This is a schematic diagram of the measurement of angular displacement in this invention.

[0051] Figure 4 This is a schematic diagram of the positions of the three measuring surfaces in this invention.

[0052] Figure 5 This is a top view of the geometric relationship between the relevant parameters H2, L, D2 and α measured in this invention.

[0053] Figure 6 This is a geometric relationship diagram between the relevant parameters H1, L, D2 and α measured in this invention.

[0054] Figure 7 This is a geometric relationship diagram between the relevant parameters T and α measured in this invention. Detailed Implementation

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] See Figures 1 to 7 A method for measuring the coaxiality of a coupling, the method comprising the following steps:

[0057] Step 1: Select multiple angular measurement surfaces on the driven end half-coupling flange, and measure the angular displacement of each first measurement point to obtain the angular displacement of all angular measurement surfaces;

[0058] Step 2: Select multiple radial measuring surfaces on the outer circumference of the driven end half coupling, and measure the radial displacement of each radial measuring surface to obtain the radial displacement of all radial measuring surfaces.

[0059] Step 3: Compare the angular displacement of all angular measuring surfaces and the radial displacement of all radial measuring surfaces. The largest radial or angular displacement is the coaxiality of the coupling under test.

[0060] In step one, multiple angular measuring surfaces are selected on the driven end half-coupling flange, and the angular displacement is measured at each first measuring point to obtain the angular displacement of all angular measuring surfaces:

[0061] A. Using the outer circular cross-section of the driving end half-coupling as the reference plane, select multiple measurement surfaces on the outer circumference of the driven end half-coupling, measure the distance H1 between the highest point J1 of one of the measurement surfaces on the outer circumference of the driven end half-coupling and the reference plane O, and the distance H2 between the lowest point J11 and the reference plane O, and calculate the difference between the highest and lowest points.

[0062] B. Measure the diameter D1 of the outer circular surface of the driven end half-coupling flange and the diameter D2 of the outer cylindrical surface of the driven end half-coupling.

[0063] C. Draw a three-dimensional model based on the values ​​of D1, D2, the highest point and the lowest point, and then calculate the deflection angle α of the maximum flange face of the driven end half coupling based on the three-dimensional model;

[0064] D. Based on the deflection angle α of the maximum flange face of the driven end half-coupling, calculate the angular offset of the flange face of the driven end half-coupling under this test surface.

[0065] E. Calculate the angular offset corresponding to other surfaces to be measured according to the above steps, compare all the angular offsets, and the largest angular offset is the angular offset of the coupling to be measured.

[0066] Preferably, there are three measuring surfaces:

[0067] The midpoint of the outer circumference of the driven half-coupling along the generatrix direction is the first measuring surface;

[0068] The section near the flange of the driven half-coupling is the second measuring surface;

[0069] The section at the end of the driven half-coupling flange furthest from the driven end is the third measuring surface.

[0070] The first step involves measuring the distance H1 between the highest point J1 of one of the surfaces to be measured on the outer circumference of the driven half-coupling and the reference surface O, and the distance H2 between the lowest point J11 and the reference surface O. This includes the following steps:

[0071] A. Install the driven end half coupling onto the driven shaft;

[0072] B. The testing instrument is fixed on the outer circular surface of the driving end half coupling. After the dial indicator is zeroed, the probe is pressed against the outer circular surface of the driven end half coupling without any clearance.

[0073] C. Rotate the driven end half-coupling one revolution along the rotation center line, and record the highest and lowest points of the dial indicator during the one revolution.

[0074] D. Measure the reading S1 corresponding to the highest point A on the measurement surface, and measure the reading S2 corresponding to the lowest point B on the measurement surface;

[0075] The difference between the measured values ​​corresponding to the highest and lowest points: △H A =S1-S2.

[0076] The distance from the highest point A on the measuring surface to the center line of rotation is H1, and the distance from the lowest point B on the measuring surface to the center line of rotation is H2. The difference between H2 and H1 is: ΔH B =H2-H1; At this time, ΔH=ΔH A =△H B .

[0077] The angle α of the maximum flange face of the driven end half-coupling, calculated based on the three-dimensional model, is as follows:

[0078] The axial distance from the measuring point to the flange face of the driven half-coupling is L. Taking the rotation center line as the reference, the inclination angle of the maximum flange face of the driven half-coupling can be obtained by the following formula based on the geometric relationship between parameters L, D2, α, △H, H2 and H1.

[0079] H2=D2*cosα+L*sinα+D2*sinα*tgα;

[0080] H1 = D2*cosα - L*sinα;

[0081] At this time, △H = △H A =△H B =D2*tgα*sinα+2*L*sinα.

[0082] The calculation of the angular offset T of the driven end half-coupling flange face based on the deflection angle α of the maximum flange face of the driven end half-coupling is specifically as follows: Based on the geometric relationship between the angular offset T, the diameter D1 of the driven end half-coupling flange face, and the deflection angle α of the flange face, the following formula can be obtained: T=D1*sinα.

[0083] Step two involves selecting multiple radial measuring surfaces on the outer circumference of the driven end half-coupling, and measuring the radial displacement of each radial measuring surface to obtain the radial displacement of all radial measuring surfaces. Specifically:

[0084] Using the outer circular surface of the driving end half-coupling as a reference, select multiple radial measuring surfaces on the outer circumference of the driven end half-coupling. Measure the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven end half-coupling and the reference line O, and the distance G11 between the lowest point of D3 and the reference line O. G1 is the maximum radial runout, and G11 is the minimum radial runout. Calculate the difference between the maximum radial runout G1 and the minimum radial runout G11. The difference is the radial displacement of the coupling.

[0085] Calculate the radial displacement corresponding to other radial measuring surfaces according to the above steps, compare all radial displacements, and the largest radial displacement is the radial displacement of the coupling under test.

[0086] Multiple measurement points are selected equally along the generatrix direction on the outer circumference of the driven half-coupling.

[0087] Preferably, the intersection of the generatrix on the outer circumference of the driven half-coupling and the split surface is the first measuring point D1; the intersection of the section near the flange of the driven half-coupling and the generatrix is ​​the second measuring point D2; and the intersection of the section away from the end of the flange of the driven half-coupling and the generatrix is ​​the third measuring point D3.

[0088] The measurement of the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven end half-coupling and the reference line O, and the distance G11 between the lowest point of D3 and the reference line O, are specifically as follows:

[0089] Fix the testing instrument on the outer circular surface of the driving end half coupling. After zeroing the dial indicator, press the probe against the outer circular surface of the driven end half coupling without any clearance.

[0090] Rotate the driven shaft and the driven end half coupling one revolution along the rotation center line, and detect the radial runout of the measurement point on the outer circumference of the driven end half coupling during one revolution of the driven end half coupling, and record the maximum radial runout G1 and the minimum radial runout G11.

[0091] The calculation of the difference between the maximum radial runout G1 and the minimum radial runout G11 is specifically as follows:

[0092] △G = G1 - G11.

[0093] The following are supplementary descriptions of the present invention:

[0094] Using the outer circular surface of the driving end half-coupling as a reference, the radial displacement and angular displacement of the driven end half-coupling on the measuring surface are detected, and the larger one is selected as the coaxiality of the coupling under test. The operation is simple and the coaxiality of the coupling is accurately measured.

[0095] Example 1:

[0096] A method for measuring the coaxiality of a coupling, the method comprising the following steps:

[0097] Step 1: Select multiple angular measurement surfaces on the driven end half-coupling flange, and measure the angular displacement of each first measurement point to obtain the angular displacement of all angular measurement surfaces;

[0098] Step 2: Select multiple radial measuring surfaces on the outer circumference of the driven end half coupling, and measure the radial displacement of each radial measuring surface to obtain the radial displacement of all radial measuring surfaces.

[0099] Step 3: Compare the angular displacement of all angular measuring surfaces and the radial displacement of all radial measuring surfaces. The largest radial or angular displacement is the coaxiality of the coupling under test.

[0100] Example 2:

[0101] Example 2 is basically the same as Example 1, except that:

[0102] In step one, multiple angular measuring surfaces are selected on the driven end half-coupling flange, and the angular displacement is measured at each first measuring point to obtain the angular displacement of all angular measuring surfaces:

[0103] A. Using the outer circular cross-section of the driving end half-coupling as the reference plane, select multiple measurement surfaces on the outer circumference of the driven end half-coupling, measure the distance H1 between the highest point J1 of one of the measurement surfaces on the outer circumference of the driven end half-coupling and the reference plane O, and the distance H2 between the lowest point J11 and the reference plane O, and calculate the difference between the highest and lowest points.

[0104] B. Measure the diameter D1 of the outer circular surface of the driven end half-coupling flange and the diameter D2 of the outer cylindrical surface of the driven end half-coupling.

[0105] C. Draw a three-dimensional model based on the values ​​of D1, D2, the highest point and the lowest point, and then calculate the deflection angle α of the maximum flange face of the driven end half coupling based on the three-dimensional model;

[0106] D. Based on the deflection angle α of the maximum flange face of the driven end half-coupling, calculate the angular offset of the flange face of the driven end half-coupling under this test surface.

[0107] E. Calculate the angular offset corresponding to other surfaces to be measured according to the above steps, compare all the angular offsets, and the largest angular offset is the angular offset of the coupling to be measured.

[0108] Preferably, there are three measuring surfaces:

[0109] The midpoint of the outer circumference of the driven half-coupling along the generatrix direction is the first measuring surface;

[0110] The section near the flange of the driven half-coupling is the second measuring surface;

[0111] The section furthest from the flange end of the driven half-coupling is the third measuring surface;

[0112] The first step involves measuring the distance H1 between the highest point J1 of one of the surfaces to be measured on the outer circumference of the driven half-coupling and the reference surface O, and the distance H2 between the lowest point J11 and the reference surface O. This includes the following steps:

[0113] A. Install the driven end half coupling onto the driven shaft;

[0114] B. The testing instrument is fixed on the outer circular surface of the driving end half coupling. After the dial indicator is zeroed, the probe is pressed against the outer circular surface of the driven end half coupling without any clearance.

[0115] Before installing the driven half coupling to the driven shaft, the mounting surfaces of the driven shaft and the half coupling should be cleaned to remove oil, dust and impurities. At the same time, check the mounting surfaces for damage, such as scratches or bumps. If there is any damage, it should be repaired or replaced.

[0116] C. Rotate the driven end half-coupling one revolution along the rotation center line, and record the highest and lowest points of the dial indicator during the one revolution.

[0117] D. Measure the reading S1 corresponding to the highest point A on the measurement surface, and measure the reading S2 corresponding to the lowest point B on the measurement surface;

[0118] After recording the highest and lowest points, repeat the steps at least three times. For each measurement, accurately record the highest and lowest points as the dial indicator rotates one revolution. Then, average the data from multiple measurements to reduce random errors during the measurement process.

[0119] The operating procedure facilitates quality control during production. If the measurement results are abnormal, the process can be traced back based on the detailed operation records to find the links that may have caused the problem, such as whether there was a deviation during the installation process or whether there was any violation of the operation during the measurement process.

[0120] The difference between the measured values ​​corresponding to the highest and lowest points: △H A =S1-S2;

[0121] The distance from the highest point A on the measuring surface to the center line of rotation is H1, and the distance from the lowest point B on the measuring surface to the center line of rotation is H2. The difference between H2 and H1 is: ΔH B =H2-H1; At this time, ΔH=ΔH A =△H B ;

[0122] The angle α of the maximum flange face of the driven end half-coupling, calculated based on the three-dimensional model, is as follows:

[0123] The axial distance from the measuring point to the flange face of the driven half-coupling is L. Taking the rotation center line as the reference, the inclination angle of the maximum flange face of the driven half-coupling can be obtained by the following formula based on the geometric relationship between parameters L, D2, α, △H, H2 and H1.

[0124] H2=D2*cosα+L*sinα+D2*sinα*tgα;

[0125] H1 = D2*cosα - L*sinα;

[0126] At this time, △H = △H A =△H B =D2*tgα*sinα+2*L*sinα;

[0127] The calculation of the angular offset T of the driven end half-coupling flange face based on the deflection angle α of the maximum flange face of the driven end half-coupling is specifically as follows: Based on the geometric relationship between the angular offset T, the diameter D1 of the driven end half-coupling flange face, and the deflection angle α of the flange face, the following formula can be obtained: T=D1*sinα; where D1 is the diameter of the driven end half-coupling flange face.

[0128] Example 3:

[0129] Example 3 is basically the same as Example 1, except that:

[0130] Step two involves selecting multiple radial measuring surfaces on the outer circumference of the driven end half-coupling, and measuring the radial displacement of each radial measuring surface to obtain the radial displacement of all radial measuring surfaces. Specifically:

[0131] Using the outer circular surface of the driving end half-coupling as a reference, select multiple radial measuring surfaces on the outer circumference of the driven end half-coupling. Measure the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven end half-coupling and the reference line O, and the distance G11 between the lowest point of D3 and the reference line O. G1 is the maximum radial runout, and G11 is the minimum radial runout. Calculate the difference between the maximum radial runout G1 and the minimum radial runout G11. The difference is the radial displacement of the coupling.

[0132] Calculate the radial displacement corresponding to other radial measurement surfaces according to the above steps, compare all radial displacements, and the largest radial displacement is the radial displacement of the coupling to be measured.

[0133] Multiple measurement points are selected equally along the generatrix direction on the outer circumference of the driven half-coupling.

[0134] Preferably, the intersection of the generatrix on the outer circumference of the driven half-coupling and the split surface is the first measuring point D1; the intersection of the section near the flange of the driven half-coupling and the generatrix is ​​the second measuring point D2; and the intersection of the section away from the end of the flange of the driven half-coupling and the generatrix is ​​the third measuring point D3.

[0135] The measurement of the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven end half-coupling and the reference line O, and the distance G11 between the lowest point of D3 and the reference line O, are specifically as follows:

[0136] Fix the testing instrument on the outer circular surface of the driving end half coupling. After zeroing the dial indicator, press the probe against the outer circular surface of the driven end half coupling without any clearance.

[0137] Rotate the driven shaft and the driven end half coupling one revolution along the rotation center line, and detect the radial runout of the measurement point on the outer circumference of the driven end half coupling during one revolution of the driven end half coupling, and record the maximum radial runout G1 and the minimum radial runout G11.

[0138] The calculation of the difference between the maximum radial runout G1 and the minimum radial runout G11 is specifically as follows:

[0139] △G = G1 - G11.

[0140] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A method for measuring the coaxiality of a coupling, characterized in that: The method for measuring the coaxiality of the coupling includes the following steps: Step 1: Select multiple angular measurement points on the driven end half-coupling flange, and measure the angular displacement of each angular measurement point to obtain the angular displacement of all angular measurement points; A. Using the outer circular cross-section of the driving end half-coupling as the reference plane, select multiple surfaces to be measured on the outer circumference of the driven end half-coupling. Measure the distance H1 between the highest point (J1) of one of the surfaces to be measured on the outer circumference of the driven end half-coupling and the reference plane (O), and the distance H2 between the lowest point (J11) and the reference plane (O). Calculate the difference between the highest and lowest points. B. Measure the first diameter D1 of the outer circular surface of the driven end half-coupling flange and the second diameter D2 of the outer cylindrical surface of the driven end half-coupling; C. Draw a three-dimensional model based on the values ​​of the first diameter D1, the second diameter D2, the highest point, and the lowest point, and then calculate the deflection angle α of the maximum flange face of the driven end half coupling based on the three-dimensional model; D. Based on the deflection angle α of the maximum flange face of the driven end half-coupling, calculate the angular offset of the flange face of the driven end half-coupling under this test surface. E. Calculate the angular offset corresponding to other surfaces to be measured according to the above steps, compare all the angular offsets, and the largest angular offset is the angular offset of the coupling to be measured. The multiple measuring surfaces are three in number, specifically: The midpoint of the outer circumference of the driven half-coupling along the generatrix direction is the first measuring surface; The section near the flange of the driven half-coupling is the second measuring surface; The section furthest from the flange end of the driven half-coupling is the third measuring surface; Measuring the distance H1 between the highest point (J1) of one of the measured surfaces on the outer circumference of the driven half-coupling and the reference surface (O), and the distance H2 between the lowest point (J11) and the reference surface (O), includes the following steps: A. Install the driven end half coupling onto the driven shaft; B. The testing instrument is fixed on the outer circular surface of the driving end half coupling. After the dial indicator is zeroed, the probe is pressed against the outer circular surface of the driven end half coupling without any clearance. C. Rotate the driven end half-coupling one revolution along the rotation center line, and record the highest and lowest points of the dial indicator during the one revolution. D. Measure the reading S1 corresponding to the highest point A on the measurement surface, and measure the reading S2 corresponding to the lowest point B on the measurement surface; The difference between the measured values ​​corresponding to the highest and lowest points: △H A =S1-S2; The distance from the highest point A on the measuring surface to the center line of rotation is H1, and the distance from the lowest point B on the measuring surface to the center line of rotation is H2. The difference between H2 and H1 is: ΔH B =H2-H1; At this time, ΔH=ΔH A =△H B； The angle α of the maximum flange face of the driven end half-coupling, calculated based on the three-dimensional model, is as follows: The axial distance from the angular measurement point to the flange face of the driven half-coupling is L. Taking the rotation center line as the reference, the tilt angle of the maximum flange face of the driven half-coupling can be obtained by the following formula based on the geometric relationship between parameters L, D2, α, △H, H2 and H1. H2=D2 / 2*cosα+L*sinα+D2*sinα*tgα; H1 = D2 / 2 * cosα - L * sinα; At this time, △H = △H A =△H B =D2*tgα*sinα+2*L*sinα; The calculation of the angular offset T of the driven end half-coupling flange surface based on the deflection angle α of the maximum flange surface of the driven end half-coupling is specifically as follows: Based on the geometric relationship between the angular offset T, the first diameter D1 of the driven end half-coupling flange surface, and the deflection angle α of the flange surface, the following formula can be obtained: T=D1*sinα. Step 2: Select multiple radial measurement points on the outer circumference of the driven end half coupling, and measure the radial displacement of each radial measurement point to obtain the radial displacement of all radial measurement points; Step 3: Compare the angular displacement of all angular measurement points and the radial displacement of all radial measurement points. The largest radial or angular displacement is the coaxiality of the coupling under test.

2. The method for measuring the coaxiality of a coupling according to claim 1, characterized in that: Step two involves selecting multiple radial measurement points on the outer circumference of the driven half-coupling, and measuring the radial displacement at each point to obtain the radial displacement of all radial measurement points. Specifically: Using the outer circular surface of the driving end half coupling as a reference, select multiple radial measurement points on the outer circumference of the driven end half coupling. Measure the distance G1 between the highest point of the third measurement point d3 on the outer circumference of the driven end half coupling and the reference surface (O), and the distance G11 between the lowest point of d3 and the reference line O. G1 is the maximum radial runout, and G11 is the minimum radial runout. Calculate the difference between the maximum radial runout G1 and the minimum radial runout G11. The difference is the radial displacement of the coupling. Calculate the radial displacement corresponding to other radial measurement points according to the above steps, compare all radial displacements, and the largest radial displacement is the radial displacement of the coupling under test.

3. The method for measuring the coaxiality of a coupling according to claim 2, characterized in that: Multiple measurement points are selected equally along the generatrix direction on the outer circumference of the driven half-coupling. The intersection of the generatrix on the outer circumference of the driven half-coupling and the split surface is the first measurement point d1; the intersection of the section near the flange of the driven half-coupling and the generatrix is ​​the second measurement point d2; and the intersection of the section far from the end of the flange of the driven half-coupling and the generatrix is ​​the third measurement point d3.

4. The method for measuring the coaxiality of a coupling according to claim 3, characterized in that: The measurement of the distance G1 between the highest point of the third measuring point d3 on the outer circumference of the driven end half-coupling and the reference line O, and the distance G11 between the lowest point of the third measuring point d3 and the reference line O, are specifically as follows: Fix the testing instrument on the outer circular surface of the driving end half coupling. After zeroing the dial indicator, press the probe against the outer circular surface of the driven end half coupling without any clearance. Rotate the driven shaft and the driven end half coupling one revolution along the rotation center line, and detect the radial runout of the measurement point on the outer circumference of the driven end half coupling during one revolution of the driven end half coupling, and record the maximum radial runout G1 and the minimum radial runout G11.

5. The method for measuring the coaxiality of a coupling according to claim 4, characterized in that: The calculation of the difference between the maximum radial runout G1 and the minimum radial runout G11 is specifically as follows: △G = G1 - G11.

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