Coupling coaxiality measuring method

Abstract

The invention discloses a method for measuring the coaxiality of a coupling, and the method comprises the following steps: 1, selecting a plurality of angular measurement surfaces on a driven end half-coupling flange, carrying out the measurement of the angular displacement of each first measurement point, and obtaining the angular displacement of all angular measurement surfaces; step 2, selecting a plurality of radial measuring surfaces on the outer circumference of the driven end half coupling, and respectively measuring the radial displacement of each radial measuring surface to obtain the radial displacement of all the radial measuring surfaces; and 3, comparing the angular displacement of all the angular measuring surfaces with the radial displacement of all the radial measuring surfaces, wherein the maximum radial displacement or angular displacement is the coaxiality of the coupler to be measured. Various influence factors are considered, and the measurement result is accurate.

Description

Technical Field

[0001] The invention relates to an improvement of a coupling coaxiality measurement technology, belongs to the field of coupling precision measurement, and in particular to a coupling coaxiality measurement method. Background Art

[0002] Couplings are divided into rigid couplings and flexible couplings. Rigid couplings do not have the ability to buffer and compensate for the relative displacement of the axis, so the two axes are required to be strictly aligned. Although flexible couplings have a certain buffer and the ability to compensate for the relative displacement of the axis, the actual offset must also be within the compensation range allowed by the selected coupling. Therefore, whether it is a rigid coupling or a flexible coupling, in the process of transmitting motion and torque, it is necessary to ensure that the alignment (i.e. coaxiality) of the driven end half coupling and the active end half coupling is controlled within the allowable value range. If the coaxiality of the two half couplings exceeds the allowable range, it will cause abnormal vibration of the two half couplings and the connected machines at both ends, excessive bearing temperature rise or breakage, heat deformation and wear of the seals, etc. The existing detection method only detects the influence of radial displacement on coaxiality, and does not take into account that angular displacement will also affect coaxiality, resulting in inaccurate measurement results.

[0003] A Chinese patent application with application number CN 202210450413.4 and application date April 26, 2022 discloses a highly applicable coaxiality measurement test bench for rotating parts, including a base plate and a straight rod, a detection component is fixedly installed on the top of the base plate, the detection component includes an electric push rod, the electric push rod is fixedly installed on the top of the base plate, a dial indicator is fixedly installed on the output end of the electric push rod, and a touch rod is fixedly installed on the top of the dial indicator. The straight rod is sleeved with a rotating body on the outside, and mounting frames are fixedly installed on the left and right sides of the top of the bottom plate. A limit assembly that fits the rotating body is fixedly installed on the outside of the straight rod, and the limit assembly includes a first limit plate, which is fixedly installed on the outside of the straight rod and fits with the left side of the rotating body. The straight rod is sleeved with a second limit plate, and a limit cavity is provided inside the second limit plate. The limit cavity is slidably connected to a limit block. A limit rod that extends to the inside of the straight rod and engages with the limit rod is fixedly installed on the bottom of the limit block, and a pull rod that extends to the top of the second limit plate is fixedly installed on the top of the limit block. A limit spring sleeved on the outside of the pull rod is fixedly installed between the limit block and the inner top wall of the limit cavity. However, the above scheme does not solve the problem of inaccurate measurement results caused by only considering radial displacement.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem in the prior art that only radial displacement is considered, resulting in inaccurate measurement results, and to provide a coupling coaxiality measurement method that takes multiple influencing factors into consideration and has accurate measurement results.

[0006] To achieve the above purpose, the technical solution of the present invention is: a method for measuring the coaxiality of a coupling, the method for measuring the coaxiality of a coupling comprising the following steps: Step 1: Select multiple angular measurement surfaces on the driven end half coupling flange, measure the angular displacement of each first measurement point, and obtain the angular displacement of all angular measurement surfaces; Step 2: Select multiple radial measuring surfaces on the outer circumference of the driven end half coupling, measure the radial displacement of each radial measuring surface respectively, and obtain the radial displacement of all radial measuring surfaces; Step 3: Compare the angular displacements of all angular measuring surfaces and the radial displacements of all radial measuring surfaces, wherein the largest radial displacement or angular displacement is the coaxiality of the coupling to be measured.

[0007] In the step 1, multiple angular measurement surfaces are selected on the driven end half coupling flange, and the angular displacement of each first measurement point is measured respectively, and the angular displacement of all angular measurement surfaces is obtained as follows: A. Take the cross section of the outer circumference of the driving half coupling as the reference plane, then select multiple measuring surfaces on the outer circumference of the driven half coupling, measure the distance H1 between the highest point J1 of one of the measuring surfaces on the outer circumference of the driven 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 point and the lowest point; B. Measure the diameter D1 of the outer surface of the driven half coupling flange and the diameter D2 of the outer cylindrical surface of the driven half coupling; 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 surface of the driven end half coupling based on the three-dimensional model; D. According to the deflection angle α of the maximum flange surface of the driven end half coupling, calculate the angular offset of the flange surface of the driven end half coupling under the test surface; E. Calculate the angular offsets of other surfaces to be measured according to the above steps, and compare all the angular offsets. The largest angular offset is the angular offset of the coupling to be measured.

[0008] The multiple measuring surfaces are preferably three, specifically: The center dividing surface on the outer circumference of the driven end half coupling in the generatrix direction is the first measuring surface; The section near the driven end half coupling flange is the second measuring surface; The section away from the end of the driven half coupling flange is the third measuring plane.

[0009] In the first step, 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 are measured, including the following steps: A. Install the passive half coupling onto the driven shaft; B. The testing instrument is fixed on the outer cylindrical surface of the driving end half coupling. After the dial indicator is adjusted to zero, the probe is pressed against the outer cylindrical surface of the driven end half coupling without gap; C. Rotate the driven end half coupling along the rotation centerline for one turn, and record the highest and lowest points of the dial indicator during the one turn process; D. Measure the reading S1 corresponding to the highest point A on the measuring surface, and measure the reading S2 corresponding to the lowest point B on the measuring surface; The difference between the measured values ​​corresponding to the highest point and the lowest point: △H A =S1-S2.

[0010] 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: △H B =H2-H1; at this time, △H=△H A =△H B .

[0011] The deflection angle α of the maximum flange surface of the driven end half coupling is calculated based on the three-dimensional model, specifically: The axial distance from the measuring point to the flange surface of the driven half coupling is L. Based on the rotation centerline, the inclination angle of the maximum flange surface of the driven half coupling can be obtained by the following formula according to the geometric relationship between the parameters L, D2, α, △H, H2 and H1; H2=D2*cosα+L*sinα+D2*sinα*tgα; H1=D2*cosα- L*sinα; At this time, △H=△H A =△H B =D2*tgα*sinα+2*L*sinα.

[0012] The angular offset T of the driven end half coupling flange surface is calculated based on the maximum deflection angle α of the driven end half coupling flange surface. Specifically, the following formula can be obtained based on the geometric relationship between the angular offset T, the driven end half coupling flange surface diameter D1 and the deflection angle α of the flange surface: T=D1*sinα.

[0013] In the second step, multiple radial measuring surfaces are selected on the outer circumference of the driven end half coupling, and radial displacement of each radial measuring surface is measured respectively to obtain radial displacement of all radial measuring surfaces, specifically: Taking the outer cylindrical surface of the driving half coupling as the reference, select multiple radial measuring surfaces on the outer circumference of the driven half coupling, measure the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven 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, G11 is the minimum radial runout, and calculate the difference between the maximum radial runout G1 and the minimum radial runout G11. The difference is the radial displacement of the coupling. According to the above steps, calculate the radial displacements corresponding to other radial measuring surfaces, compare all the radial displacements, and the largest radial displacement is the radial displacement of the coupling to be measured.

[0014] The method comprises selecting a plurality of measuring points on the outer circumference of the driven end half coupling in the direction of the generatrix in equal parts. Preferably, the intersection of the generatrix and the median plane on the outer circumference of the driven half coupling is the first measuring point D1; the intersection of the section close to the driven half coupling flange and the generatrix is ​​the second measuring point D2; the intersection of the section away from the end of the driven half coupling flange and the generatrix is ​​the third measuring point D3.

[0015] 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: Fix the detection instrument on the outer circumference of the driving end half coupling, adjust the dial indicator to zero, and press the probe against the outer circumference of the driven end half coupling without gap; The driven shaft and the driven end half coupling are rotated one circle along the rotation center line, and the radial runout of the measuring point to be measured on the outer circumference of the driven end half coupling is detected during the driven end half coupling rotates one circle, and the maximum radial runout G1 and the minimum radial runout G11 are recorded.

[0016] The calculation of the difference between the maximum radial runout G1 and the minimum radial runout G11 is specifically: △G=G1-G11.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. In a coupling coaxiality measurement method of the present invention, a plurality of measuring points are equally divided along the generatrix direction on the outer circumference of the driven end half coupling, and the outer circumferential surface of the driving end half coupling is used as a reference to detect the radial runout of the driven end half coupling on the same generatrix one by one, and the radial displacement of the coupling is obtained by calculating the difference between the maximum radial runout and the minimum radial runout. At the same time, the maximum clearance and the minimum clearance between the driving end half coupling and the driven end half coupling are measured by selecting measuring points on the driven end half coupling flange and using the outer circumferential surface of the driving end half coupling as a reference. Small gap, then mathematical modeling and calculation can be used to obtain the accurate values ​​of the angular offsets corresponding to multiple measuring surfaces of the grade coupling one by one, and the one with the largest value is selected as the coaxiality of the coupling, which comprehensively considers the influence of radial displacement and angular displacement on the coaxiality of the coupling, and can more comprehensively and accurately measure the coaxiality of the coupling, which helps to ensure that the centering of the two half couplings in the process of transmitting motion and torque is within the allowable value range, thereby avoiding the problems of abnormal vibration of the two half couplings and the connected two end machines, excessive bearing temperature rise or breakage, heat deformation and wear of the seal caused by inaccurate coaxiality measurement. Therefore, the present invention takes into account multiple influencing factors and the measurement results are accurate.

[0018] 2. In a coupling coaxiality measurement method of 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, and the outer circumferential surface of the active half coupling is used as the reference to detect the difference between the highest point and the lowest point of each measuring surface of the driven half coupling one by one. This multi-measuring surface sampling method can obtain the angular offset information of the coupling more comprehensively. After mathematical modeling and calculation, the angular offset corresponding to each measuring surface can be accurately obtained. The relative difference measurement method has high stability and is not affected by the slight change in the absolute position of the measurement reference. The influence of fluctuations can more accurately reflect the angular offset of each measuring surface, and then the angular offset of each measuring surface is obtained through mathematical modeling and calculation, which ensures the accuracy of the result, and selects the maximum value of multiple angular offsets as the angular offset of the coupling to be measured, because this maximum value can better reflect the overall offset state of the coupling, and can avoid misjudgment of the working state of the coupling due to improper value selection, thereby realizing accurate measurement of the angular displacement of the flexible coupling, and solving the problem that the angular displacement of the flexible coupling cannot be directly detected by conventional measuring tools. Therefore, the angular displacement of the present invention is convenient to measure.

[0019] 3. In the method for measuring the coaxiality of a coupling of the present invention, no special and complicated measuring equipment is required. The outer cylindrical surface of the half coupling at the active end is used as a reference, and the difference between the highest point and the lowest point is measured using conventional measuring tools. It is easy for engineering and technical personnel 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, which reduces the measurement cost. Therefore, the present invention is simple to measure and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of measuring radial displacement in the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the through hole in the present invention.

[0022] Figure 3 It is a schematic diagram of measuring angular displacement in the present invention.

[0023] Figure 4 It is a schematic diagram of the positions of three measuring surfaces in the present invention.

[0024] Figure 5 It is a top view of the geometric relationship diagram among the measurement-related parameters H2, L, D2 and α in the present invention.

[0025] Figure 6 It is a geometric relationship diagram among the measurement-related parameters H1, L, D2 and α in the present invention.

[0026] Figure 7 It is a geometric relationship diagram between the measurement related parameters T and α in the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] See also Figures 1 to 7 , a method for measuring the coaxiality of a coupling, the method for measuring the coaxiality of a coupling comprising the following steps: Step 1: Select multiple angular measurement surfaces on the driven end half coupling flange, measure the angular displacement of each first measurement point, and obtain the angular displacement of all angular measurement surfaces; Step 2: Select multiple radial measuring surfaces on the outer circumference of the driven end half coupling, measure the radial displacement of each radial measuring surface respectively, and obtain the radial displacement of all radial measuring surfaces; Step 3: Compare the angular displacements of all angular measuring surfaces and the radial displacements of all radial measuring surfaces, wherein the largest radial displacement or angular displacement is the coaxiality of the coupling to be measured.

[0029] In the step 1, multiple angular measurement surfaces are selected on the driven end half coupling flange, and the angular displacement of each first measurement point is measured respectively, and the angular displacement of all angular measurement surfaces is obtained as follows: A. Take the cross section of the outer circumference of the driving half coupling as the reference plane, then select multiple measuring surfaces on the outer circumference of the driven half coupling, measure the distance H1 between the highest point J1 of one of the measuring surfaces on the outer circumference of the driven 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 point and the lowest point; B. Measure the diameter D1 of the outer surface of the driven half coupling flange and the diameter D2 of the outer cylindrical surface of the driven half coupling; 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 surface of the driven end half coupling based on the three-dimensional model; D. According to the deflection angle α of the maximum flange surface of the driven end half coupling, calculate the angular offset of the flange surface of the driven end half coupling under the test surface; E. Calculate the angular offsets of other surfaces to be measured according to the above steps, and compare all the angular offsets. The largest angular offset is the angular offset of the coupling to be measured.

[0030] The multiple measuring surfaces are preferably three, specifically: The center dividing surface on the outer circumference of the driven end half coupling in the generatrix direction is the first measuring surface; The section near the driven end half coupling flange is the second measuring surface; The section away from the end of the driven half coupling flange is the third measuring plane.

[0031] In the first step, 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 are measured, including the following steps: A. Install the passive half coupling onto the driven shaft; B. The testing instrument is fixed on the outer cylindrical surface of the driving end half coupling. After the dial indicator is adjusted to zero, the probe is pressed against the outer cylindrical surface of the driven end half coupling without gap; C. Rotate the driven end half coupling along the rotation centerline for one turn, and record the highest and lowest points of the dial indicator during the one turn process; D. Measure the reading S1 corresponding to the highest point A on the measuring surface, and measure the reading S2 corresponding to the lowest point B on the measuring surface; The difference between the measured values ​​corresponding to the highest point and the lowest point: △H A =S1-S2.

[0032] 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: △H B=H2-H1; at this time, △H=△H A =△H B .

[0033] The deflection angle α of the maximum flange surface of the driven end half coupling is calculated based on the three-dimensional model, specifically: The axial distance from the measuring point to the flange surface of the driven half coupling is L. Based on the rotation centerline, the inclination angle of the maximum flange surface of the driven half coupling can be obtained by the following formula according to the geometric relationship between the parameters L, D2, α, △H, H2 and H1; H2=D2*cosα+L*sinα+D2*sinα*tgα; H1=D2*cosα- L*sinα; At this time, △H=△H A =△H B =D2*tgα*sinα+2*L*sinα.

[0034] The angular offset T of the driven end half coupling flange surface is calculated based on the maximum deflection angle α of the driven end half coupling flange surface. Specifically, the following formula can be obtained based on the geometric relationship between the angular offset T, the driven end half coupling flange surface diameter D1 and the deflection angle α of the flange surface: T=D1*sinα.

[0035] In the second step, multiple radial measuring surfaces are selected on the outer circumference of the driven end half coupling, and radial displacement of each radial measuring surface is measured respectively to obtain radial displacement of all radial measuring surfaces, specifically: Taking the outer cylindrical surface of the driving half coupling as the reference, select multiple radial measuring surfaces on the outer circumference of the driven half coupling, measure the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven 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, G11 is the minimum radial runout, and calculate the difference between the maximum radial runout G1 and the minimum radial runout G11. The difference is the radial displacement of the coupling. According to the above steps, calculate the radial displacements corresponding to other radial measuring surfaces, compare all the radial displacements, and the largest radial displacement is the radial displacement of the coupling to be measured.

[0036] The method comprises selecting a plurality of measuring points on the outer circumference of the driven end half coupling in the direction of the generatrix in equal parts. Preferably, the intersection of the generatrix and the median plane on the outer circumference of the driven half coupling is the first measuring point D1; the intersection of the section close to the driven half coupling flange and the generatrix is ​​the second measuring point D2; the intersection of the section away from the end of the driven half coupling flange and the generatrix is ​​the third measuring point D3.

[0037] 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: Fix the detection instrument on the outer circumference of the driving end half coupling, adjust the dial indicator to zero, and press the probe against the outer circumference of the driven end half coupling without gap; The driven shaft and the driven end half coupling are rotated one circle along the rotation center line, and the radial runout of the measuring point to be measured on the outer circumference of the driven end half coupling is detected during the driven end half coupling rotates one circle, and the maximum radial runout G1 and the minimum radial runout G11 are recorded.

[0038] The calculation of the difference between the maximum radial runout G1 and the minimum radial runout G11 is specifically: △G=G1-G11.

[0039] The supplementary description of the present invention is as follows: The radial displacement on the measuring surface of the driven half coupling and the angular displacement of the driven half coupling are detected with the outer cylindrical surface of the driving half coupling as the reference, and the larger one is selected as the coaxiality of the coupling to be tested. The operation is simple and the accurate measurement of the coaxiality of the coupling is realized.

[0040] Embodiment 1: A method for measuring the coaxiality of a coupling, the method comprising the following steps: Step 1: Select multiple angular measurement surfaces on the driven end half coupling flange, measure the angular displacement of each first measurement point, and obtain the angular displacement of all angular measurement surfaces; Step 2: Select multiple radial measuring surfaces on the outer circumference of the driven end half coupling, measure the radial displacement of each radial measuring surface respectively, and obtain the radial displacement of all radial measuring surfaces; Step 3: Compare the angular displacements of all angular measuring surfaces and the radial displacements of all radial measuring surfaces, wherein the largest radial displacement or angular displacement is the coaxiality of the coupling to be measured.

[0041] Embodiment 2: Embodiment 2 is substantially the same as Embodiment 1, except that: In the step 1, multiple angular measurement surfaces are selected on the driven end half coupling flange, and the angular displacement of each first measurement point is measured respectively, and the angular displacement of all angular measurement surfaces is obtained as follows: A. Take the cross section of the outer circumference of the driving half coupling as the reference plane, then select multiple measuring surfaces on the outer circumference of the driven half coupling, measure the distance H1 between the highest point J1 of one of the measuring surfaces on the outer circumference of the driven 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 point and the lowest point; B. Measure the diameter D1 of the outer surface of the driven half coupling flange and the diameter D2 of the outer cylindrical surface of the driven half coupling; 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 surface of the driven end half coupling based on the three-dimensional model; D. According to the deflection angle α of the maximum flange surface of the driven end half coupling, calculate the angular offset of the flange surface of the driven end half coupling under the test surface; E. Calculate the angular offsets of other surfaces to be measured according to the above steps, and compare all the angular offsets. The largest angular offset is the angular offset of the coupling to be measured.

[0042] The multiple measuring surfaces are preferably three, specifically: The center dividing surface on the outer circumference of the driven end half coupling in the generatrix direction is the first measuring surface; The section near the driven end half coupling flange is the second measuring surface; The section away from the end of the driven half coupling flange is the third measuring surface; In the first step, 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 are measured, including the following steps: A. Install the passive half coupling onto the driven shaft; B. The testing instrument is fixed on the outer cylindrical surface of the driving end half coupling. After the dial indicator is adjusted to zero, the probe is pressed against the outer cylindrical surface of the driven end half coupling without gap; Before installing the passive half coupling to the driven shaft, clean the mounting surfaces of the driven shaft and half coupling to remove oil, dust and impurities, and check whether the mounting surfaces are damaged, such as scratches, bumps, etc. If there is any damage, repair or replace it; C. Rotate the driven end half coupling along the rotation centerline for one turn, and record the highest and lowest points of the dial indicator during the one turn process; D. Measure the reading S1 corresponding to the highest point A on the measuring surface, and measure the reading S2 corresponding to the lowest point B on the measuring surface; After recording the highest and lowest points, repeat the steps at least three times. Each time you measure, you must accurately record the highest and lowest points of the dial indicator during one rotation, and then take the average of the highest and lowest points obtained from multiple measurements to reduce random errors in the measurement process. The operation process facilitates quality control during the production process. If the measurement results are abnormal, they can be traced back based on the detailed operation records to find possible links where problems may occur, such as whether there are deviations during the installation process or whether there are any illegal operations during the measurement process. The difference between the measured values ​​corresponding to the highest point and the lowest point: △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: △H B =H2-H1; at this time, △H=△H A =△H B ; The deflection angle α of the maximum flange surface of the driven end half coupling is calculated based on the three-dimensional model, specifically: The axial distance from the measuring point to the flange surface of the driven half coupling is L. Based on the rotation centerline, the inclination angle of the maximum flange surface of the driven half coupling can be obtained by the following formula according to the geometric relationship between the parameters L, D2, α, △H, H2 and H1; H2=D2*cosα+L*sinα+D2*sinα*tgα; H1=D2*cosα- L*sinα; At this time, △H=△H A =△H B =D2*tgα*sinα+2*L*sinα; The angular offset T of the flange surface of the driven end half coupling is calculated based on the deviation angle α of the maximum flange surface of the driven end half coupling as follows: According to the geometric relationship between the angular offset T, the flange surface diameter D1 of the driven end half coupling and the deviation angle α of the flange surface, the following formula can be obtained: T=D1*sinα; wherein D1 is the flange surface diameter of the driven end half coupling.

[0043] Embodiment 3: Embodiment 3 is substantially the same as Embodiment 1, except that: In the second step, multiple radial measuring surfaces are selected on the outer circumference of the driven end half coupling, and radial displacement of each radial measuring surface is measured respectively to obtain radial displacement of all radial measuring surfaces, specifically: Taking the outer cylindrical surface of the driving half coupling as the reference, select multiple radial measuring surfaces on the outer circumference of the driven half coupling, measure the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven 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, G11 is the minimum radial runout, and 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 displacements corresponding to other radial measuring surfaces according to the above steps, and compare all radial displacements. The largest radial displacement is the radial displacement of the coupling to be measured. The method comprises selecting a plurality of measuring points on the outer circumference of the driven end half coupling in the direction of the generatrix in equal parts. Preferably, the intersection of the generatrix and the mid-plane on the outer circumference of the driven half coupling is the first measuring point D1; the intersection of the cross section near the driven half coupling flange and the generatrix is ​​the second measuring point D2; the intersection of the cross section far from the end of the driven half coupling flange and the generatrix is ​​the third measuring point D3; 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: Fix the detection instrument on the outer circumference of the driving end half coupling, adjust the dial indicator to zero, and press the probe against the outer circumference of the driven end half coupling without gap; The driven shaft and the driven end half coupling are rotated one circle along the rotation center line, and the radial runout of the measuring point to be measured on the outer circumference of the driven end half coupling is detected during the driven end half coupling rotates one circle, and the maximum radial runout G1 and the minimum radial runout G11 are recorded.

[0044] The calculation of the difference between the maximum radial runout G1 and the minimum radial runout G11 is specifically: △G=G1-G11.

[0045] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded 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 comprises the following steps: Step 1: Select multiple angular measurement points on the driven end half coupling flange, measure the angular displacement of each first measurement point, and obtain the angular displacement of all angular measurement points; Step 2: Select multiple radial measuring points on the outer circumference of the driven end half coupling, measure the radial displacement of each radial measuring point, and obtain the radial displacement of all radial measuring points; Step 3: Compare the angular displacements of all angular measuring points and the radial displacements of all radial measuring points. The largest radial displacement or angular displacement is the coaxiality of the coupling to be measured.

2. The method for measuring the coaxiality of a coupling according to claim 1, characterized in that: In the step 1, multiple angular measurement points are selected on the driven end half coupling flange, and the angular displacement of each first measurement point is measured respectively, and the angular displacement of all angular measurement points is obtained as follows: A. Take the cross section of the outer circumference of the driving half coupling as the reference plane, then select multiple measuring surfaces on the outer circumference of the driven half coupling, measure the distance H1 between the highest point J1 of one of the measuring surfaces on the outer circumference of the driven 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 point and the lowest point; B. Measure the diameter D1 of the outer surface of the driven half coupling flange and the diameter D2 of the outer cylindrical surface of the driven half coupling; 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 surface of the driven end half coupling based on the three-dimensional model; D. According to the deflection angle α of the maximum flange surface of the driven end half coupling, calculate the angular offset of the flange surface of the driven end half coupling under the test surface; E. Calculate the angular offsets of other surfaces to be measured according to the above steps, and compare all the angular offsets. The largest angular offset is the angular offset of the coupling to be measured.

3. The method for measuring the coaxiality of a coupling according to claim 2, characterized in that: The multiple measuring surfaces are preferably three, specifically: The center dividing surface on the outer circumference of the driven end half coupling in the generatrix direction is the first measuring surface; The section near the driven end half coupling flange is the second measuring surface; The section away from the end of the driven half coupling flange is the third measuring plane.

4. The method for measuring the coaxiality of a coupling according to claim 3, characterized in that: In the first step, 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 are measured, including the following steps: A. Install the passive half coupling onto the driven shaft; B. The testing instrument is fixed on the outer cylindrical surface of the driving end half coupling. After the dial indicator is adjusted to zero, the probe is pressed against the outer cylindrical surface of the driven end half coupling without gap; C. Rotate the driven end half coupling along the rotation centerline for one turn, and record the highest and lowest points of the dial indicator during the one turn process; D. Measure the reading S1 corresponding to the highest point A on the measuring surface, and measure the reading S2 corresponding to the lowest point B on the measuring surface; The difference between the measured values ​​corresponding to the highest point and the lowest point: △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: △H B =H2-H1; at this time, △H=△H A =△H B .

5. The method for measuring the coaxiality of a coupling according to claim 4, characterized in that: The deflection angle α of the maximum flange surface of the driven end half coupling is calculated based on the three-dimensional model, specifically: The axial distance from the measuring point to the flange surface of the driven half coupling is L. Based on the rotation centerline, the inclination angle of the maximum flange surface of the driven half coupling can be obtained by the following formula according to the geometric relationship between the parameters L, D2, α, △H, H2 and H1; H2=D2*cosα+L*sinα+D2*sinα*tgα; H1=D2*cosα- L*sinα; At this time, △H=△H A =△H B =D2*tgα*sinα+2*L*sinα.

6. A method for measuring the coaxiality of a coupling according to claim 5, characterized in that: The angular offset T of the driven end half coupling flange surface is calculated based on the maximum deflection angle α of the driven end half coupling flange surface. Specifically, the following formula can be obtained based on the geometric relationship between the angular offset T, the driven end half coupling flange surface diameter D1 and the deflection angle α of the flange surface: T=D1*sinα.

7. The method for measuring the coaxiality of a coupling according to claim 1, characterized in that: In the second step, multiple radial measuring points are selected on the outer circumference of the driven end half coupling, and radial displacement is measured for each radial measuring point to obtain radial displacement of all radial measuring points, specifically: Taking the outer cylindrical surface of the driving half coupling as the reference, select multiple radial measuring points on the outer circumference of the driven half coupling, measure the distance G1 between the highest point of the measured point D3 on the outer circumference of the driven 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, G11 is the minimum radial runout, and calculate the difference between the maximum radial runout G1 and the minimum radial runout G11. The difference is the radial displacement of the coupling. According to the above steps, the radial displacements corresponding to other radial measuring points are calculated, and all radial displacements are compared. The largest radial displacement is the radial displacement of the coupling to be measured.

8. The method for measuring the coaxiality of a coupling according to claim 7, characterized in that: The method comprises selecting a plurality of measuring points on the outer circumference of the driven end half coupling in the direction of the generatrix in equal parts. Preferably, the intersection of the generatrix and the median plane on the outer circumference of the driven half coupling is the first measuring point D1; the intersection of the section close to the driven half coupling flange and the generatrix is ​​the second measuring point D2; the intersection of the section away from the end of the driven half coupling flange and the generatrix is ​​the third measuring point D3.

9. A method for measuring the coaxiality of a coupling according to claim 8, characterized in that: 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: Fix the detection instrument on the outer circumference of the driving end half coupling, adjust the dial indicator to zero, and press the probe against the outer circumference of the driven end half coupling without gap; The driven shaft and the driven end half coupling are rotated one circle along the rotation center line, and the radial runout of the measuring point to be measured on the outer circumference of the driven end half coupling is detected during the driven end half coupling rotates one circle, and the maximum radial runout G1 and the minimum radial runout G11 are recorded.

10. A method for measuring the coaxiality of a coupling according to claim 9, characterized in that: The calculation of the difference between the maximum radial runout G1 and the minimum radial runout G11 is specifically: △G=G1-G11.

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