A vertical pump shaft with built-in sensor for swing measurement and its measurement method

Abstract

This invention relates to a vertical pump shaft with a built-in sensor for sway measurement and a method thereof. The invention includes a vertical pump shaft with a built-in eddy current sway sensor and a center positioning device. The eddy current sway sensor is used to measure the gap distance between the center positioning device and the surface of the vertical pump shaft. The eddy current sway sensor system includes four first sensors, four second sensors, four third sensors, and four fourth sensors. The center positioning device includes a first center positioning device, a second center positioning device, a third center positioning device, and a fourth center positioning device. This invention allows for flexible definition of the number of data collection points on the circumference of the pump shaft. Compared with the traditional eight-point rotation method, this invention effectively avoids the inability to accurately measure the sway data at the originally fixed eight points due to excessive inertia of the rotating parts, and increases the amount of data collected within one cycle, thereby improving the quality of the final sway curve.

Description

Technical Field

[0001] This invention relates to a vertical pump shaft with a built-in sensor for measuring swing and a method thereof, belonging to the field of water conservancy engineering technology. Background Technology

[0002] The inspection and adjustment of the pump unit shaft is a crucial step in the installation and maintenance of pump station units. Currently, the traditional eight-point measurement method is still the mainstream method for measuring runout in China. However, this method uses eight points to fit the sine curve generated by the runout, which has the drawback of large errors. Furthermore, due to the large inertia of the rotating parts of the unit, it is difficult to accurately detect the data at the marked points, resulting in a mismatch between the turning head data and the angle data. Turning head measurement is also inconvenient. Therefore, this invention proposes a vertical pump shaft with an built-in sensor for runout measurement. The eddy current sensor has the advantages of strong anti-interference ability, high reliability, and long service life. It is used to measure the gap between metal surfaces and can operate continuously for a long time in harsh environments. By arranging eddy current sensor groups at the lower guide, flange, and water guide positions, rapid and accurate measurement and numerical verification of the pump shaft runout can be achieved. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a vertical pump shaft with a built-in sensor for measuring swing and a method thereof, which can conveniently, quickly and accurately obtain swing data through the built-in sensor of this pump shaft.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a vertical pump shaft with a built-in sensor for measuring runout, characterized in that it includes: a vertical pump shaft with a built-in eddy current runout sensor, a center positioning device, wherein the eddy current runout sensor is used to measure the gap distance from the center positioning device to the surface of the vertical pump shaft.

[0005] The eddy current slew rate sensor system includes four first sensors, four second sensors, four third sensors, and four fourth sensors; the center positioning device includes a first center positioning device, a second center positioning device, a third center positioning device, and a fourth center positioning device.

[0006] in:

[0007] Four first sensors are arranged at the lower guide position of the vertical pump shaft. The four first sensors are y-direction first sensor A, x-direction first sensor A, y-direction first sensor B, and x-direction first sensor B.

[0008] Four second sensors are arranged on the flange of the vertical pump shaft. The four second sensors are y-direction second sensor A, x-direction second sensor A, y-direction second sensor B, and x-direction second sensor B.

[0009] Four third sensors are arranged at the lower flange of the vertical pump shaft. The four third sensors are Y-axis third sensor A, X-axis third sensor A, Y-axis third sensor B, and X-axis third sensor B.

[0010] Four fourth sensors are arranged at the water guide of the vertical pump shaft. The four fourth sensors are y-direction fourth sensor A, x-direction fourth sensor A, y-direction fourth sensor B, and x-direction fourth sensor B.

[0011] The first center positioning device is installed at the lower guide of the vertical pump shaft;

[0012] The second center positioning device is installed at the flange on the vertical pump shaft;

[0013] The third center positioning device is installed at the lower flange of the vertical pump shaft;

[0014] The fourth center positioning device is installed at the water guide of the vertical pump shaft.

[0015] The y-direction first sensor A and y-direction first sensor B are perpendicular to the x-direction first sensor A and x-direction first sensor B;

[0016] The y-direction second sensor A and y-direction second sensor B are perpendicular to the x-direction second sensor A and x-direction second sensor B;

[0017] The y-direction third sensor A and the y-direction third sensor B are perpendicular to the x-direction third sensor A and the x-direction third sensor B;

[0018] The third sensor A and the third sensor B in the y-direction are perpendicular to the third sensor A and the third sensor B in the x-direction.

[0019] The first sensor A in the y direction, the first sensor B in the y direction, the second sensor A in the y direction, the second sensor B in the y direction, the third sensor A in the y direction, the third sensor B in the y direction, the fourth sensor A in the y direction, and the fourth sensor B in the x direction are all in the same vertical plane;

[0020] The x-direction first sensor A, x-direction first sensor B, x-direction second sensor A, x-direction second sensor B, x-direction third sensor A, x-direction third sensor B, x-direction fourth sensor A, and x-direction fourth sensor B are in the same vertical plane.

[0021] The first sensor A in the y direction, the first sensor B in the y direction, the second sensor A in the y direction, the second sensor B in the y direction, the third sensor A in the y direction, the third sensor B in the y direction, the fourth sensor A in the y direction, and the fourth sensor B in the x direction are all parallel to each other;

[0022] The x-direction first sensor A, x-direction first sensor B, x-direction second sensor A, x-direction second sensor B, x-direction third sensor A, x-direction third sensor B, x-direction fourth sensor A, and x-direction fourth sensor B are all parallel to each other.

[0023] Each sensor in the eddy current swing sensor system is perpendicular to the tangent at the circumference of its corresponding detection point.

[0024] A method for measuring the runout of a vertical pump shaft using a built-in sensor, comprising the following steps:

[0025] Step 1: Install a vertical pump shaft with a built-in sensor for sway measurement according to the standard process; the sensor is an eddy current sway sensor; the eddy current sway sensor includes: x-direction first sensor A, x-direction first sensor B, x-direction second sensor A, x-direction second sensor B, x-direction third sensor A, x-direction third sensor B, x-direction fourth sensor A, x-direction fourth sensor B, y-direction first sensor A, y-direction first sensor B, y-direction second sensor A, y-direction second sensor B, y-direction third sensor A, y-direction third sensor B, y-direction fourth sensor A, and x-direction fourth sensor B;

[0026] Step 2: Collect and record all sensor data;

[0027] Step 3: Calculate the eccentricity values ​​of the lower guide, upper flange, lower flange, and water guide on the vertical pump shaft;

[0028] Step 4: Calculate the pump shaft coordinates and the coordinates of the center positioning device at a specific angle α;

[0029] Step 5: Calculate the absolute oscillation at a specific angle α;

[0030] Step 6: Calculate the relative runout and the amount of shim scraping at a specific angle α;

[0031] Step 7: Determine whether the relative runout meets the specifications. If it does, record the relative runout data. If it does not, calculate the shim addition or turning amount, perform the shim addition or turning process, and return to Step 1.

[0032] This invention features a rational structure and scientific method. It provides a vertical pump shaft with a built-in sensor for measuring pump shaft runout, comprising: a vertical pump shaft with a built-in eddy current runout sensor system and a center positioning device. The eddy current runout sensor measures the gap distance between the center positioning device and the pump shaft surface. This allows for quick, convenient, and accurate determination of the pump shaft's absolute runout. Compared to the traditional eight-point rotation method, this invention effectively avoids the problem of inaccurate measurement of runout data at the originally fixed eight points due to excessive inertia of rotating components, as well as the inconvenience of rotation measurement. The eddy current sensor used in this invention has advantages such as strong anti-interference capability, high reliability, and long service life. It is used to measure pump shaft runout and can operate continuously for extended periods in harsh environments, improving both operational simplicity and data accuracy, and enabling verification of the measurement data.

[0033] The present invention has the following beneficial effects:

[0034] 1. The number of data collection points on the circumference can be flexibly defined. Compared with the traditional eight-point circumference method, this invention can effectively avoid the inability to accurately measure the swing data at the original eight fixed points due to excessive inertia of the rotating parts, and increase the number of data collected in one cycle, thereby improving the quality of the final swing curve.

[0035] 2. It can automatically adapt to the turning speed. Compared with the eddy current sensor for measuring the pendulum or the traditional eight-point method for measuring the pendulum, this invention can effectively avoid the drawbacks of difficulty in turning the wheel at a uniform and constant angular velocity, improve the ease of operation and improve the accuracy of the data. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of the present invention after the first central positioning device, the second central positioning device, the third central positioning device, and the fourth central positioning device are installed;

[0038] Figure 3 for Figure 1 A top-view structural diagram of the first sensor A in the middle, the first sensor A in the x direction, the first sensor B in the y direction, and the first sensor B in the x direction;

[0039] Figure 4 for Figure 1 A top-view structural diagram of the second sensor A in the middle, the second sensor A in the x direction, the second sensor B in the y direction, and the second sensor B in the x direction.

[0040] Figure 5 for Figure 1A top-view structural diagram of the third sensor A in the middle direction, the third sensor A in the x direction, the third sensor B in the y direction, and the third sensor B in the x direction;

[0041] Figure 6 for Figure 1 A top-view structural diagram of the fourth sensor A in the middle direction, the fourth sensor A in the x direction, the fourth sensor B in the y direction, and the fourth sensor B in the x direction.

[0042] Figure 7 This is a schematic diagram for calculating the y-axis sensor swing.

[0043] Figure 8 This is a schematic diagram illustrating the calculation of the x-axis sensor swing.

[0044] In the diagram: 1. Vertical pump shaft; 1-1y-direction to first sensor A; 1-2x-direction to first sensor A; 1-3y-direction to first sensor B; 1-4x-direction to first sensor B; 1-5. First central positioning device; 2-1y-direction to second sensor A; 2-2x-direction to second sensor A; 2-3y-direction to second sensor B; 2-4x-direction to second sensor B; 2-5. Second central positioning device; 3-1y-direction to third sensor A; 3-2x-direction to third sensor A; 3-3y-direction to third sensor B; 3-4x-direction to third sensor B; 3-5. Third central positioning device; 4-1y-direction to fourth sensor A; 4-2x-direction to fourth sensor A; 4-3y-direction to fourth sensor B; 4-4x-direction to fourth sensor B; 4-5. Fourth central positioning device. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and description.

[0046] A vertical pump shaft with a built-in sensor for swing measurement includes: a vertical pump shaft 1 with a built-in eddy current swing sensor, and a center positioning device, wherein the eddy current swing sensor is used to measure the gap distance from the center positioning device to the surface of the vertical pump shaft 1.

[0047] The eddy current slew rate sensor system includes four first sensors, four second sensors, four third sensors, and four fourth sensors; the center positioning device includes a first center positioning device 1-5, a second center positioning device 2-5, a third center positioning device 3-5, and a fourth center positioning device 4-5.

[0048] in:

[0049] Four first sensors are arranged at the lower guide position of the vertical pump shaft 1. The four first sensors are y-direction first sensor A1-1, x-direction first sensor A1-2, y-direction first sensor B1-3, and x-direction first sensor B1-4.

[0050] Four second sensors are arranged at the flange on the vertical pump shaft 1. The four second sensors are A2-1 in the y direction, A2-2 in the x direction, B2-3 in the y direction, and B2-4 in the x direction.

[0051] Four third sensors are arranged at the lower flange of the vertical pump shaft 1. The four third sensors are A3-1 in the y direction, A3-2 in the x direction, B3-3 in the y direction, and B3-4 in the x direction.

[0052] Four fourth sensors are arranged at the water guide of the vertical pump shaft 1. The four fourth sensors are A4-1 in the y direction, A4-2 in the x direction, B4-3 in the y direction, and B4-4 in the x direction.

[0053] The first center positioning device 1-5 is installed at the lower guide of the vertical pump shaft 1;

[0054] The second center positioning device 2-5 is installed at the flange on the vertical pump shaft 1;

[0055] The third center positioning device 3-5 is installed at the lower flange of the vertical pump shaft 1;

[0056] The fourth center positioning device 4-5 is installed at the water guide of the vertical pump shaft 1.

[0057] The y-direction first sensor A1-1 and the y-direction first sensor B1-3 are perpendicular to the x-direction first sensor A1-2 and the x-direction first sensor B1-4;

[0058] The y-direction second sensor A2-1 and y-direction second sensor B2-3 are perpendicular to the x-direction second sensor A2-2 and x-direction second sensor B2-4;

[0059] The third sensor A3-1 and the third sensor B3-3 in the y direction are perpendicular to the third sensor A3-2 and the third sensor B3-4 in the x direction;

[0060] The third sensors A4-1 and B4-3 in the y-direction are perpendicular to the third sensors A4-2 and B4-4 in the x-direction.

[0061] The y-direction of the first sensor A1-1, the y-direction of the first sensor B1-3, the y-direction of the second sensor A2-1, the y-direction of the second sensor B2-3, the y-direction of the third sensor A3-1, the y-direction of the third sensor B3-3, the y-direction of the fourth sensor A4-1, and the x-direction of the fourth sensor B4-4 are all in the same vertical plane;

[0062] The x-direction first sensor A1-2, x-direction first sensor B1-4, x-direction second sensor A2-2, x-direction second sensor B2-4, x-direction third sensor A3-2, x-direction third sensor B3-4, x-direction fourth sensor A4-2, and x-direction fourth sensor B4-4 are in the same vertical plane.

[0063] The directions y-direction to the first sensor A1-1, y-direction to the first sensor B1-3, y-direction to the second sensor A2-1, y-direction to the second sensor B2-3, y-direction to the third sensor A3-1, y-direction to the third sensor B3-3, y-direction to the fourth sensor A4-1, and x-direction to the fourth sensor B4-4 are all parallel to each other.

[0064] The x-direction first sensor A1-2, x-direction first sensor B1-4, x-direction second sensor A2-2, x-direction second sensor B2-4, x-direction third sensor A3-2, x-direction third sensor B3-4, x-direction fourth sensor A4-2, and x-direction fourth sensor B4-4 are all parallel to each other.

[0065] Each sensor in the eddy current swing sensor system is perpendicular to the tangent at the circumference of its corresponding detection point.

[0066] When using it, the following steps are included:

[0067] Step 1: Install a vertical pump shaft with a built-in sensor for sway measurement according to the standard process; the sensor is an eddy current sway sensor; the eddy current sway sensor includes: x-direction first sensor A1-2, x-direction first sensor B1-4, x-direction second sensor A2-2, x-direction second sensor B2-4, x-direction third sensor A3-2, x-direction third sensor B3-4, x-direction fourth sensor A4-2, x-direction fourth sensor B4-4, y-direction first sensor A1-1, y-direction first sensor B1-3, y-direction second sensor A2-1, y-direction second sensor B2-3, y-direction third sensor A3-1, y-direction third sensor B3-3, y-direction fourth sensor A4-1, and x-direction fourth sensor B4-4;

[0068] Step 2: Collect and record all sensor data;

[0069] Step 3: Calculate the eccentricity values ​​of the lower guide, upper flange, lower flange, and water guide on the vertical pump shaft 1;

[0070] Step 4: Calculate the pump shaft coordinates and the coordinates of the center positioning device at a specific angle α;

[0071] Step 5: Calculate the absolute oscillation at a specific angle α;

[0072] Step 6: Calculate the relative runout and the amount of shim scraping at a specific angle α;

[0073] Step 7: Determine whether the relative runout meets the specifications. If it does, record the relative runout data. If it does not, calculate the shim addition or turning amount, perform the shim addition or turning process, and return to Step 1.

[0074] As shown in the figure, the structure of this invention includes: a first sensor A1-1 in the y-direction, a first sensor A1-2 in the x-direction, a first sensor B1-3 in the y-direction, a first sensor B1-4 in the x-direction, a first central positioning device 1-5, a central positioning device 2, a second sensor A2-1 in the y-direction, a second sensor A2-2 in the x-direction, a second sensor B2-3 in the y-direction, a second sensor B2-4 in the x-direction, a second central positioning device 2-5, a third sensor A3-1 in the y-direction, a third sensor A3-2 in the x-direction, a third sensor B3-3 in the y-direction, a third sensor B3-4 in the x-direction, a third central positioning device 3-5, a fourth sensor A4-1 in the y-direction, a fourth sensor A4-2 in the x-direction, a fourth sensor B4-3 in the y-direction, a fourth sensor B4-4 in the x-direction, and a fourth central positioning device 4-5.

[0075] The first sensor A1-1 in the y direction, the first sensor A1-2 in the x direction, the first sensor B1-3 in the y direction, and the first sensor B1-4 in the x direction are arranged at the lower guide position of the vertical pump shaft 1;

[0076] The second sensor A2-1 in the y direction, the second sensor A2-2 in the x direction, the second sensor B2-3 in the y direction, and the second sensor B2-4 in the x direction are arranged at the flange on the vertical pump shaft 1;

[0077] The y-direction third sensor A3-1, the x-direction third sensor A3-2, the y-direction third sensor B3-3, and the x-direction third sensor B3-4 are arranged at the lower flange of the vertical pump shaft 1;

[0078] The fourth sensor A4-1 in the y direction, the fourth sensor A4-2 in the x direction, the fourth sensor B4-3 in the y direction, and the fourth sensor B4-4 in the x direction are arranged at the water guide of the vertical pump shaft 1.

[0079] Taking the calculation of the eccentric position of the guide as an example, with the existing central positioning device 1-5, the distances that the first sensor A1-1 and the first sensor B1-3 in the y-direction can measure are b and a, respectively. The actual eccentric distance in the x-direction is e, and the actual eccentric distance in the y-direction is f. The radii of the pump shaft and the central positioning device are r and R, respectively. According to geometric principles, we know that:

[0080]

[0081] The corresponding eccentric distances e and f in the x and y directions can be calculated:

[0082]

[0083] Similarly, the distances that the first sensor A1-2 in the x-direction and the first sensor B1-4 in the X-direction can measure are c and d, respectively. The actual eccentric distance in the x-direction is e, the actual eccentric distance in the y-direction is f, and the radii of the pump shaft and the center positioning device are r and R, respectively. According to geometric principles, we know that:

[0084]

[0085] The corresponding eccentric distances e and f in the x and y directions can be calculated:

[0086]

[0087] The eccentricity values ​​at the lower guide calculated by the arranged sensors (y-direction first sensor A1-1, x-direction first sensor A1-2, y-direction first sensor B1-3, x-direction first sensor B1-4) are used to mutually verify the accuracy of the data. The average of the two values ​​is taken as the actual eccentricity value, which can reduce system error. Therefore, the actual eccentricity distance at the lower guide is:

[0088]

[0089] The coordinates of various positions at the lower guide of a vertical pump shaft, which is equipped with a built-in sensor for measuring swing, can be calculated when the eccentricity at the lower guide is known. The coordinates of the outer wall of the pump shaft at a certain angle α at the lower guide and the coordinates of the inner wall of the center positioning device are as follows:

[0090]

[0091]

[0092] An integrated sensor for measuring runout allows for the calculation of the absolute runout at the lower guide of a vertical pump shaft when the coordinates are known. The absolute runout at a certain angle α at the lower guide is:

[0093]

[0094] A vertical pump shaft with built-in sensors for swing measurement has four sensors arranged at the lower guide, upper flange, lower flange, and water guide. Using the above calculation method, the eccentricity values ​​at the lower guide, upper flange, lower flange, and water guide can be calculated sequentially as follows:

[0095] (e 下导 ,f 下导 ), (e 上法兰 ,f 上法兰 ), (e 下法兰 ,f 下法兰 ), (e 水导 ,f 水导 )

[0096] Similarly, the absolute runout at a certain angle α at the lower guide, upper flange, lower flange, and water guide can be calculated sequentially:

[0097] dis 下导α ,dis 上法兰α ,dis 下法兰α ,dis 水导α

[0098] By combining a vertical pump shaft with a built-in sensor for runout measurement and a center positioning device, the absolute runout can be measured using the method described above. Utilizing the principle of similar triangles, and combining the actual mirror plate diameter, the maximum net runout value at the motor lower guide or flange, and the distance between points on both sides of the main shaft, the position for adding or scraping the insulating pad, and the value for adding or scraping the pad, can be calculated.

[0099] This invention discloses a method for using a vertical pump shaft with a built-in sensor for measuring runout, comprising:

[0100] Step 1: Install a vertical pump shaft with a built-in sensor for swing measurement according to the standard process;

[0101] Step 2: Collect and record sensor data from a vertical pump shaft with a built-in sensor for measuring swing.

[0102] Step 3: Calculate the eccentricity values ​​of the lower guide, upper flange, lower flange, and water guide;

[0103] Step 4: Calculate the pump shaft coordinates and the coordinates of the center positioning device at a specific angle α;

[0104] Step 5: Calculate the absolute oscillation at a specific angle α;

[0105] Step 6: Calculate the relative runout and shim scraping amount at a specific angle α using traditional methods;

[0106] Step 7: Determine whether the relative runout meets the specifications. If it does, record the relative runout data. If it does not, calculate the shim addition or turning amount, perform the shim addition or turning process, and return to Step 1.

Claims

1. A vertical pump shaft with a built-in sensor for measuring runout, characterized in that, include: A vertical pump shaft (1) with a built-in eddy current swing sensor and a center positioning device, wherein the eddy current swing sensor is used to measure the gap distance from the center positioning device to the surface of the vertical pump shaft (1). The eddy current oscillation sensor includes four first sensors, four second sensors, four third sensors, and four fourth sensors; the center positioning device includes a first center positioning device (1-5), a second center positioning device (2-5), a third center positioning device (3-5), and a fourth center positioning device (4-5). in: Four first sensors are arranged at the lower guide position of the vertical pump shaft (1). The four first sensors are y-direction first sensor A (1-1), x-direction first sensor A (1-2), y-direction first sensor B (1-3), and x-direction first sensor B (1-4). Four second sensors are arranged on the flange of the vertical pump shaft (1). The four second sensors are y-direction second sensor A (2-1), x-direction second sensor A (2-2), y-direction second sensor B (2-3), and x-direction second sensor B (2-4). Four third sensors are arranged at the lower flange of the vertical pump shaft (1). The four third sensors are y-direction third sensor A (3-1), x-direction third sensor A (3-2), y-direction third sensor B (3-3), and x-direction third sensor B (3-4). Four fourth sensors are arranged at the water guide of the vertical pump shaft (1). The four fourth sensors are y-direction fourth sensor A (4-1), x-direction fourth sensor A (4-2), y-direction fourth sensor B (4-3), and x-direction fourth sensor B (4-4). The first center positioning device (1-5) is installed at the lower guide of the vertical pump shaft (1); The second center positioning device (2-5) is installed at the flange on the vertical pump shaft (1); The third center positioning device (3-5) is installed at the lower flange of the vertical pump shaft (1); The fourth center positioning device (4-5) is installed at the water guide of the vertical pump shaft (1).

2. A vertical pump shaft with a built-in sensor for measuring swing according to claim 1, characterized in that: The first sensor A (1-1) and the first sensor B (1-3) in the y direction are perpendicular to the first sensor A (1-2) and the first sensor B (1-4) in the x direction; The y-direction second sensor A (2-1) and y-direction second sensor B (2-3) are perpendicular to the x-direction second sensor A (2-2) and x-direction second sensor B (2-4); The third sensor A (3-1) and the third sensor B (3-3) in the y direction are perpendicular to the third sensor A (3-2) and the third sensor B (3-4) in the x direction; The fourth sensor A (4-1) and the fourth sensor B (4-3) in the y direction are perpendicular to the fourth sensor A (4-2) and the fourth sensor B (4-4) in the x direction.

3. A vertical pump shaft with a built-in sensor for measuring swing according to claim 1, characterized in that: The first sensor A (1-1) in the y direction, the first sensor B (1-3) in the y direction, the second sensor A (2-1) in the y direction, the second sensor B (2-3) in the y direction, the third sensor A (3-1) in the y direction, the third sensor B (3-3) in the y direction, the fourth sensor A (4-1) in the y direction, and the fourth sensor B (4-4) in the x direction are in the same vertical plane; The x-direction first sensor A (1-2), x-direction first sensor B (1-4), x-direction second sensor A (2-2), x-direction second sensor B (2-4), x-direction third sensor A (3-2), x-direction third sensor B (3-4), x-direction fourth sensor A (4-2), and x-direction fourth sensor B (4-4) are in the same vertical plane.

4. A vertical pump shaft with a built-in sensor for measuring swing as described in claim 1, characterized in that: The first sensor A (1-1) in the y direction, the first sensor B (1-3) in the y direction, the second sensor A (2-1) in the y direction, the second sensor B (2-3) in the y direction, the third sensor A (3-1) in the y direction, the third sensor B (3-3) in the y direction, the fourth sensor A (4-1) in the y direction, and the fourth sensor B (4-4) in the x direction are all parallel to each other; The x-direction first sensor A (1-2), x-direction first sensor B (1-4), x-direction second sensor A (2-2), x-direction second sensor B (2-4), x-direction third sensor A (3-2), x-direction third sensor B (3-4), x-direction fourth sensor A (4-2), and x-direction fourth sensor B (4-4) are all parallel to each other.

5. A vertical pump shaft with a built-in sensor for measuring swing according to claim 1, characterized in that: Each sensor of the eddy current swing sensor is perpendicular to the tangent at the circumferential position of its corresponding detection point.

6. A method for measuring the runout of a vertical pump shaft using a built-in sensor, as described in any one of claims 1-5, characterized in that... Includes the following steps: Step 1: Install a vertical pump shaft with a built-in sensor for swing measurement according to the standard process; The sensor is an eddy current slew rate sensor; The eddy current slew rate sensor includes: x-direction first sensor A (1-2), x-direction first sensor B (1-4), x-direction second sensor A (2-2), x-direction second sensor B (2-4), x-direction third sensor A (3-2), x-direction third sensor B (3-4), x-direction fourth sensor A (4-2), x-direction fourth sensor B (4-4), y-direction first sensor A (1-1), y-direction first sensor B (1-3), y-direction second sensor A (2-1), y-direction second sensor B (2-3), y-direction third sensor A (3-1), y-direction third sensor B (3-3), y-direction fourth sensor A (4-1), and x-direction fourth sensor B (4-4); Step 2: Collect and record all sensor data; Step 3: Calculate the eccentricity values ​​of the lower guide, upper flange, lower flange, and water guide on the vertical pump shaft (1); Step 4: Calculate the pump shaft coordinates and the coordinates of the center positioning device at a specific angle α; Step 5: Calculate the absolute oscillation at a specific angle α; Step 6: Calculate the relative runout and the amount of shim scraping at a specific angle α; Step 7: Determine whether the relative runout meets the specifications. If it does, record the relative runout data. If it does not, calculate the shim addition or turning amount, perform the shim addition or turning process, and return to Step 1.

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