A kind of drive shaft straightness detection device and method

Abstract

The application provides a kind of drive shaft straightness detection device and method, the device includes detection table, detection table is equipped with several pairs of support mechanism for supporting drive shaft, detection table is arranged along the length direction of drive shaft Multiple sets of detection mechanism, detection mechanism includes sensor support, sensor support is equipped with two sets of mutually perpendicular swing sensor, swing sensor is perpendicular to the axis of drive shaft, drive motor is arranged on the end of drive shaft, the output shaft of drive motor is connected with drive shaft through connecting mechanism, swing sensor is connected with computer.The device and method can efficiently, quickly realize drive shaft straightness detection.

Description

Technical Field

[0001] This invention relates to the field of straightness testing equipment, and particularly to a device and method for testing the straightness of a drive shaft. Background Technology

[0002] To ensure the long-term safe and stable operation of long-shaft deep well pumps, the drive shaft must be inspected during installation or maintenance, requiring a straightness of less than 0.3mm. Currently, there are two methods for drive shaft straightness inspection: 1. Large-scale machining and measuring equipment, characterized by its large size, high measurement accuracy, high price, and inconvenient disassembly and assembly, suitable for machining and measuring rotating parts in factories; 2. Laser trackers, characterized by their lightweight design, ability to fully reproduce the dimensions of the measured component, and high degree of automation, but their measurement accuracy is affected by the environment. Neither of these methods is suitable for measuring the straightness of the drive shaft of long-shaft deep well pumps in hydropower stations. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device and method for detecting the straightness of a drive shaft, which can efficiently and quickly detect the straightness of a drive shaft.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a transmission shaft straightness detection device, including a detection table, a plurality of support mechanisms for supporting the transmission shaft are provided on the detection table, a plurality of detection mechanisms are arranged on the detection table along the length direction of the transmission shaft, the detection mechanism includes a sensor bracket, two sets of mutually perpendicular sway sensors are provided on the sensor bracket, the sway sensors are perpendicular to the axis of the transmission shaft, a drive motor is provided at the end of the transmission shaft, the output shaft of the drive motor is connected to the transmission shaft through a connecting mechanism, and the sway sensors are connected to a computer.

[0005] In a preferred embodiment, the support mechanism includes a support frame with a "V" shaped groove at the upper end.

[0006] In a preferred embodiment, a support roller is provided on the upper side of the "V"-shaped groove.

[0007] In a preferred embodiment, an electronic scale is provided between the support frame and the testing platform. A threaded hole is provided on the testing platform corresponding to the support mechanism. A load-bearing adjustment screw is engaged with the threaded hole. The lower end of the load-bearing adjustment screw is provided with a handle, and the upper end is located at the bottom of the electronic scale.

[0008] In a preferred embodiment, the connecting mechanism is a magnet, which is disposed at the end of the output shaft of the drive motor.

[0009] The present invention also provides a method for detecting the straightness of a drive shaft, comprising the following steps:

[0010] Step 1: Place the drive shaft on the support mechanism, and connect the end of the drive shaft to the output shaft of the drive motor through the connecting mechanism. Each set of detection mechanisms has two swing sensors, including an X-axis swing sensor and a Y-axis swing sensor.

[0011] Step 2: Start the drive motor to rotate the transmission shaft, and the oscillation sensor collects the oscillation data of the transmission shaft;

[0012] Step 3: The computer processes the data collected by the sway sensor.

[0013] In the preferred embodiment, in step two, the drive motor rotates once every N1 seconds, and the computer collects data every N1 / 36 seconds, wherein the Y-axis sway sensor collects data Y(y1, y2, y3…y) within N1 seconds. 36 The X-axis sensor N collects data X(x) within 1 second. 28 x 29 …x 36 x1, x2, x3…x 27 ).

[0014] In the preferred embodiment, step three, data processing includes the following steps:

[0015] S1. With the rotation center line of the transmission shaft as the Z-axis and the direction away from the output shaft of the drive motor as the positive direction, establish a rectangular coordinate system perpendicular to the rotation center line of the transmission shaft at each part of the detection mechanism. The rotation center line of the transmission shaft passes through point O of each plane rectangular coordinate system. The X-axis coincides with the center line of the X-axis swing sensor, and the Y-axis coincides with the center line of the Y-axis swing sensor.

[0016] S2. The coordinates of the axis of any part corresponding to a set of testing mechanisms in their respective Cartesian coordinate systems are: but With Y(y1, y2, y3…y 36 ), X(x) 28 x 29 …x 36 x1, x2, x3…x 27 The following relationship is satisfied:

[0017]

[0018]

[0019] The coordinates of the axis of each part of the testing institution in the corresponding Cartesian coordinate system are as follows: N2 represents the number of testing institutions;

[0020] S3, will Project along the Z-axis onto the same plane rectangular coordinate system, calculate the distance between all points, and represent the straightness of the drive shaft by the maximum value of the distance between points. If the computer calculates that the value is less than 0.3mm for N3 consecutive N1 seconds, it means that the straightness of the drive shaft is qualified; otherwise, it will announce that the straightness of the drive shaft exceeds the standard.

[0021] The present invention provides a drive shaft straightness detection device and method, which uses a motor to drive the drive shaft to rotate, a sensor to collect the drive shaft swing, calculates the center distance of the shaft center projection at different shaft positions, and uses the maximum center distance to approximate the straightness of the drive shaft. It can quickly determine whether the straightness of the drive shaft meets the requirements, has a high degree of automation, a simple device structure, convenient drive shaft installation and adjustment, and is easy to operate. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a front view of the present invention;

[0024] Figure 2 This is the left view of the present invention;

[0025] Figure 3 A schematic diagram showing the installation of the rollers;

[0026] Figure 4 The coordinates of the axis of the corresponding part of the testing agency in the corresponding Cartesian coordinate system;

[0027] Figure 5 The projection diagram of the coordinates of the corresponding parts of the testing agency in the corresponding plane rectangular coordinate system onto a unified coordinate system;

[0028] In the figure: 1. Detection table, 2. Drive shaft, 3. Sensor bracket, 4. Swing sensor, 5. Drive motor, 6. Connecting mechanism, 7. Support frame, 8. Load-bearing adjustment screw, 9. Handle, 101. Threaded hole, 701. V-groove, 702. Support roller. Detailed Implementation

[0029] like Figures 1-2 As shown, a drive shaft straightness testing device includes a testing platform 1. The testing platform 1 is provided with several support mechanisms that support the drive shaft 2. The support mechanisms support the drive shaft 2 without affecting the rotation of the drive shaft 2. In this embodiment, the support mechanism includes a support frame 7. The upper end of the support frame 7 is provided with a "V" shaped groove 701. In specific use, petroleum jelly can be applied to the "V" shaped groove 701 to reduce the rotational friction of the drive shaft 2.

[0030] Multiple detection mechanisms are arranged on the detection table 1 along the length of the transmission shaft 2. The detection mechanism includes a sensor bracket 3, on which two sets of mutually perpendicular swing sensors 4 are provided. The swing sensors 4 are perpendicular to the axis of the transmission shaft 2. The two swing sensors 4 can be set horizontally and vertically respectively.

[0031] A drive motor 5 is provided at the end of the drive shaft 2. The drive motor 5 is mounted on the detection table 1. The output shaft of the drive motor 5 is connected to the drive shaft 2 through a connecting mechanism 6. The sway sensor 4 is electrically connected to the computer. During the rotation of the drive shaft 2, the computer collects data from the sway sensor 4 at regular intervals.

[0032] The connecting mechanism 6 can be a structure that can be easily connected to the shaft, such as a three-jaw chuck. In this embodiment, the connecting mechanism 6 is a magnet, which is set at the end of the output shaft of the drive motor 5. The magnet can also be replaced by an electromagnet.

[0033] Preferably, a support roller 702 is provided on the upper side of the "V"-shaped groove 701. Specifically, mounting grooves are symmetrically arranged on both sides of the "V"-shaped groove 701, and the support roller 702 is installed in the mounting grooves. The rotation axis of the support roller 702 is parallel to the rotation center of the transmission shaft 2. By setting the support roller 702, the friction force of the transmission shaft 2 rotation can be reduced.

[0034] Preferably, an electronic scale 8 is provided between the support frame 7 and the testing platform 1. A threaded hole 101 is provided on the testing platform 1 corresponding to the support mechanism. The load-bearing adjustment screw 8 cooperates with the threaded hole 101. The lower end of the load-bearing adjustment screw 8 is provided with a handle 9, and the upper end is located at the bottom of the electronic scale 8. By rotating and adjusting the load-bearing adjustment screw 8, the support force of the electronic scale 8 can be adjusted, so that the support force of each electronic scale 8 is relatively uniform, and the transmission shaft 2 is prevented from having a large deflection due to its own weight.

[0035] A method for detecting the straightness of a drive shaft includes the following steps:

[0036] Step 1: Grind and clean the drive shaft 2 and the drive shaft straightness detection device. The mating surfaces of the drive shaft 2 and the "V" groove 701 should be clean, free of burrs, and smooth. The ends of the drive shaft 2, the output shaft end of the drive motor 5, and the magnet surface should be clean and free of oil. Place the drive shaft 2 on the support mechanism. The drive shaft 2 section of the shaft targeted by the detection mechanism should be free of burrs and smooth. The ends of the drive shaft 2 are connected to the output shaft of the drive motor 5 through the connecting mechanism 6. Each set of detection mechanisms has two swing sensors 4, including an X-axis swing sensor and a Y-axis swing sensor.

[0037] Step 2: Start the drive motor 5 to rotate the transmission shaft 2. The sway sensor 4 collects the sway of the transmission shaft 2. The drive motor 5 rotates once every N1 seconds, so the computer collects data once every N1 / 36 seconds. Among them, the Y-axis sway sensor collects data Y(y1, y2, y3…y) within N1 seconds. 36 The X-axis sensor N collects data X(x) within 1 second. 28 x 29 …x 36 x1, x2, x3…x 27 ).

[0038] Step 3: The computer processes the data collected by the swing sensor 4.

[0039] Data processing includes the following steps:

[0040] S1. With the rotation center line of the transmission shaft 2 as the Z-axis and the direction away from the output shaft of the drive motor 5 as the positive direction, establish a rectangular coordinate system in each part of the detection mechanism perpendicular to the rotation center line of the transmission shaft 2. The rotation center line of the transmission shaft 2 passes through point O of each plane rectangular coordinate system. The X-axis coincides with the center line of the X-axis swing sensor, and the Y-axis coincides with the center line of the Y-axis swing sensor.

[0041] S2. The coordinates of the axis of any part corresponding to a set of testing mechanisms in their respective Cartesian coordinate systems are: but With Y(y1, y2, y3…y 36 ), X(x) 28 x 29 …x 36 ,x1,x2,x3…x 27 The following relationship is satisfied:

[0042]

[0043]

[0044] The coordinates of the axis of each part of the testing institution in the corresponding Cartesian coordinate system are as follows: N2 represents the number of testing institutions.

[0045] like Figure 4 As shown, in this embodiment, the detection mechanism is set into four groups, that is, the axis coordinate corresponding to the detection mechanism closest to the motor shaft is... Moving away from the motor shaft, in sequence are:

[0046] S3, such as Figure 5As shown in the figure, project points A, B, C, and D onto the same rectangular coordinate system along the Z-axis. Calculate the distances between all points in this rectangular coordinate system, denoted as |AB|, |AC|, |AD|, |BC|, |BD|, and |CD|. The straightness of the transmission shaft is represented by the maximum value of the distances between points, that is, the straightness of the transmission shaft ≈ MAX(|AB|, |AC|, |AD|, |BC|, |BD|, |CD|). After clicking the computer data acquisition button for N1 seconds, the computer starts to display the straightness of the transmission shaft. If the values calculated by the computer for N3 consecutive N1 seconds are all less than 0.3 mm, it indicates that the straightness of the transmission shaft is qualified; otherwise, it reports that the straightness of the transmission shaft exceeds the standard. In this embodiment, N3 = 5, that is, if the values calculated by the computer for 5 consecutive n seconds are all less than 0.3 mm, the computer reports that the straightness of the transmission shaft is qualified; otherwise, it reports that the straightness of the transmission shaft exceeds the standard.

[0047] The straightness detection device of the transmission shaft has a simple structure and is easy to implement. It uses a motor to drive the transmission shaft to rotate, and a sensor to collect the swing of the transmission shaft, calculates the center distance of the axis projection at different shaft positions, and approximately replaces the straightness of the transmission shaft with the maximum center distance. It can quickly judge whether the straightness of the transmission shaft meets the requirements, has a high degree of automation, a simple device structure, is convenient for installing and adjusting the transmission shaft, and is easy to operate.

Claims

1. A device for detecting the straightness of a transmission shaft, characterized in that, The system includes a testing platform (1), on which several support mechanisms support the transmission shafts (2). Multiple testing mechanisms are arranged along the length of the transmission shafts (2) on the testing platform (1). Each testing mechanism includes a sensor bracket (3), on which two mutually perpendicular sway sensors (4) are mounted. The sway sensors (4) are perpendicular to the axis of the transmission shafts (2). A drive motor (5) is located at the end of the transmission shafts (2). The output shaft of the drive motor (5) is connected to the transmission shafts (2) via a connecting mechanism (6). The sway sensors (4) are connected to a computer. Each testing mechanism... The structure has two mutually perpendicular swing sensors (4), including an X-axis swing sensor and a Y-axis swing sensor. The connecting mechanism (6) is a magnet, which is set at the output shaft end of the drive motor (5). The support mechanism includes a support frame (7), with a "V" shaped groove (701) on the upper end of the support frame (7). An electronic scale is provided between the support frame (7) and the detection table (1). A threaded hole (101) is provided on the detection table (1) corresponding to the support mechanism. The load-bearing adjustment screw (8) is engaged with the threaded hole (101). The lower end of the load-bearing adjustment screw (8) is provided with a handle (9), and the upper end is set at the bottom of the electronic scale.

2. The transmission shaft straightness detection device according to claim 1, characterized in that, The upper side of the "V" shaped groove (701) is provided with a support roller (702).

3. A method for detecting the straightness of a transmission shaft based on the transmission shaft straightness detection device according to any one of claims 1 to 2, characterized in that, Includes the following steps: Step 1: Place the drive shaft (2) on the support mechanism and connect the end of the drive shaft (2) to the output shaft of the drive motor (5) through the connecting mechanism (6). Each set of detection mechanisms has two mutually perpendicular swing sensors (4), including an X-axis swing sensor and a Y-axis swing sensor respectively. Step 2: Start the drive motor (5) to drive the transmission shaft (2) to rotate. The sway sensor (4) collects the sway data of the transmission shaft (2). The drive motor (5) rotates once every N1 seconds, and the computer collects data once every N1 / 36 seconds. Among them, the Y-axis sway sensor collects data Y(y1, y2, y3…y) within N1 seconds. 36 X-axis sway sensor N collects data X (x) within 1 second. 28 x 29 …x 36 x1, x2, x3…x 27 ); Step 3: The computer processes the data collected by the sway sensor (4), including the following steps: S1. With the rotation center line of the transmission shaft (2) as the Z-axis and the direction away from the output shaft of the drive motor (5) as the positive direction, establish a rectangular coordinate system in each part of the detection mechanism in the direction perpendicular to the axis of the transmission shaft (2). The rotation center line of the transmission shaft (2) passes through point O of each plane rectangular coordinate system. The X-axis coincides with the axis of the X-axis swing sensor, and the Y-axis coincides with the axis of the Y-axis swing sensor. S2. The coordinates of the axis of any part corresponding to a set of testing mechanisms in the corresponding Cartesian coordinate system are ( , ),but , With Y (y1, y2, y3…y 36 ), X (x) 28 x 29 …x 36 x1, x2, x3…x 27 The following relationship is satisfied: The coordinates of the axis of the corresponding part of the testing agency in the corresponding Cartesian coordinate system are ( , ), ( , ), ( , )...( , N2 represents the number of testing institutions; S3, will ( , ), ( , ), ( , )...( , Project along the Z-axis onto the same plane rectangular coordinate system, calculate the distance between all points, and represent the straightness of the drive shaft by the maximum value of the distance between points. If the computer calculates that the value is less than 0.3mm for N3 consecutive N1 seconds, it means that the straightness of the drive shaft is qualified; otherwise, it will announce that the straightness of the drive shaft exceeds the standard.

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