Rotation axis offset position detection method, device, and storage medium

Abstract

Embodiments of the present application provide a rotating shaft offset position detection method, device and storage medium, the method comprising: for each coordinate axis, calculating a thermal motion amount corresponding to the coordinate axis at a target time point according to a distance value obtained by a distance sensor corresponding to the coordinate axis; calculating a shaft center offset amount of the rotating shaft in the direction of the coordinate axis according to the distance value obtained by the distance sensor and the thermal motion amount in the same coordinate axis; and calculating an offset position of the rotating shaft relative to the origin at the target time point based on the shaft center offset amount of the rotating shaft in each coordinate axis direction. In the embodiments of the present application, by establishing a rectangular coordinate system and using multiple distance sensors to collect offset amounts in real time, the offset position of the rotating shaft of a hydroelectric generating set during operation can be accurately detected.

Description

Technical Field

[0001] The present application relates to the field of detection of operating parameters of a hydro-generator set, and in particular to a method, device and storage medium for detecting the offset position of a rotating shaft. Background Art

[0002] Existing medium- and large-scale hydro-turbine generators are mostly vertical structures. During operation, they can experience oscillation, where the axis of the rotating shaft deviates from the center of the radial section of the bearing due to various forces. This oscillation requires technicians to detect the position of the offset and, based on the detected data, determine whether adjustments are necessary to ensure the proper operation of the hydro-turbine generator. However, existing technologies often fail to accurately detect the offset of the rotating shaft. Summary of the Invention

[0003] The embodiments of the present application provide a method, device, and storage medium for detecting the offset position of a rotating shaft, which are used to accurately detect the offset position of a rotating shaft during the operation of a hydro-generator set.

[0004] An embodiment of the present application provides a method for detecting a rotation axis offset position, characterized in that the method includes:

[0005] For each of the coordinate axes, calculating a thermal motion corresponding to the coordinate axis at a target time point based on a distance value obtained by a distance sensor corresponding to the coordinate axis, wherein the thermal motion reflects a change in relative diameter between the rotating shaft and the bearing under the influence of the temperature at the target time point;

[0006] Calculating an axis center offset of the rotation axis in the direction of the coordinate axis based on the distance value acquired by the distance sensor under the same coordinate axis and the thermal motion;

[0007] Based on the axis center offset of the rotation axis in the direction of each of the coordinate axes, the offset position of the rotation axis relative to the origin at the target time point is calculated.

[0008] The present application also provides a rotation shaft offset position detection device, which is characterized by comprising:

[0009] a thermal motion unit for calculating, for each of the coordinate axes, a thermal motion corresponding to the coordinate axis at a target time point based on a distance value acquired by a distance sensor corresponding to the coordinate axis, wherein the thermal motion reflects a change in relative diameter between the rotating shaft and the bearing under the influence of the temperature at the target time point;

[0010] an offset unit, configured to calculate an axis center offset of the rotation axis in the direction of the coordinate axis based on the distance value obtained by the distance sensor under the same coordinate axis and the thermal motion;

[0011] The offset position unit is used to calculate the offset position of the rotation axis relative to the origin at the target time point based on the axis center offset of the rotation axis in the direction of each coordinate axis.

[0012] In some embodiments, the distance value includes an initial distance and a movement distance at a target time point, and the thermal motion unit is used to:

[0013] The thermal motion amount corresponding to the coordinate axis at the target time point is calculated based on the initial distance obtained by the distance sensor corresponding to the coordinate axis and the motion distance at the target time point. The initial distance is the distance value detected by the distance sensor when the unit is installed.

[0014] In some embodiments, the offset unit further comprises:

[0015] a reference determination subunit, configured to select a distance sensor from the distance sensors corresponding to the coordinate axes, the distance sensor being recorded as a reference distance sensor;

[0016] The offset quantum unit is used to calculate the axis center offset of the rotation axis in the direction of the coordinate axis based on the initial distance obtained by the reference distance sensor under the same coordinate axis, the movement distance at the target time point, and the thermal motion corresponding to the coordinate axis where the reference distance sensor is located.

[0017] In some embodiments, the target time point is any one of a plurality of time points included in the detection period, and the rotation axis offset position detection unit further includes:

[0018] The judgment subunit is used to:

[0019] Determining whether the target time point is the last time point of the detection period;

[0020] and an execution subunit for:

[0021] If not, taking the next time point as the target time point, controlling the distance sensor to perform distance detection at the target time point, so as to obtain the distance value corresponding to the target time point;

[0022] Jump to step: for each of the coordinate axes, calculate the thermal motion corresponding to the coordinate axis at the target time point according to the distance value obtained by the distance sensor corresponding to the coordinate axis;

[0023] If so, the motion trajectory of the axis of the rotating shaft within the detection period is obtained according to all the offset positions.

[0024] In some embodiments, the rotation axis offset detection device further includes:

[0025] a first running clearance unit, configured to calculate, for each of the coordinate axes, a running clearance corresponding to the coordinate axis based on the thermal motion amount corresponding to the coordinate axis;

[0026] a second running clearance unit, configured to obtain a measured running clearance at the target time point based on the running clearance, wherein the measured running clearance reflects half of a maximum displacement that the rotating shaft can move in a diameter direction of the bearing;

[0027] The clearance curve unit is used to obtain the running clearance curve according to all the saved measured running clearances.

[0028] In some embodiments, the rotation axis offset detection device further includes:

[0029] The swing judgment unit is used to judge the swing degree in the detection period according to the running clearance curve and the track deviation, and the swing degree is used to reflect the stability of the guide bearing operation.

[0030] In some embodiments, the rotation axis offset detection device further includes:

[0031] an alarm generating unit, configured to generate an alarm message when the vibration degree meets a preset alarm condition;

[0032] The alarm sending unit is used to send the alarm information to the user so that the user can adjust the operating parameters of the guide bearing accordingly according to the alarm information.

[0033] In the method for detecting the offset position of the rotating shaft provided in the embodiment of the present application, multiple distance sensors are used to collect distance values ​​in real time, thermal motion is obtained based on the distance values, and finally the offset is obtained based on the thermal motion and the distance value. Compared with the existing technology, the offset obtained additionally considers the impact of operating temperature changes on the offset of the rotating shaft, and can more accurately detect the offset position of the rotating shaft when the hydro-turbine generator set is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1a Schematic diagram of a scenario of a method for detecting a rotation axis offset position provided in an embodiment of the present application;

[0036] Figure 1b1 is a flow chart of a method for detecting a rotation axis offset position provided in an embodiment of the present application;

[0037] Figure 2a Schematic diagram of calculating thermal motion using formula (1) in the embodiment of the present application;

[0038] Figure 2b This is a schematic diagram of calculating the thermal motion using formula (2) in the embodiment of this application.

[0039] Figure 3 is a schematic diagram of determining an offset position according to an offset amount in an embodiment of the present application;

[0040] Figure 4 is a schematic diagram of a preset distance between a bearing and a rotating shaft in an embodiment of the present application;

[0041] Figure 5 Schematic diagram of a motion trajectory and a running clearance curve for determining the degree of runout in an embodiment of the present application;

[0042] Figure 6a This is a schematic diagram of a specific embodiment provided in the embodiments of the present application;

[0043] Figure 6b This is a flow chart of a specific embodiment provided in the embodiments of the present application;

[0044] Figure 7 is a schematic diagram of a rotation axis offset position detection device according to an embodiment of the present application;

[0045] Figure 8 Schematic diagram of the structure of the rotation axis offset position detection system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] It should be noted that the terms used in the examples section of the embodiments of this application are intended only to explain the specific embodiments of this application and are not intended to limit this application. Furthermore, in the description of the embodiments of this application, unless otherwise specified, "a plurality" refers to two or more than two, and "at least one" refers to one, two, or more than two. The term "first" is used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. The term "superior" is used for descriptive purposes only and should not be construed as implying that the object being described is relatively more important. References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include the specific features, structures, or characteristics described in conjunction with that embodiment. Therefore, phrases such as "in one embodiment" and "some embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically stated. The terms "including," "comprising," "having," and their variations all mean "including but not limited to," unless otherwise specifically stated.

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0048] First, let’s introduce the basic concepts of the terms related to this application:

[0049] Hydro-turbine generator set: Hydro-turbine generators are divided into vertical and horizontal types according to their layout. For smaller turbines with higher rotational speeds, especially impulse turbines, horizontal shaft generators are mostly used. The rotational speeds of large turbines are relatively low. In order to generate 50Hz alternating current, the hydro-turbine generator adopts a multi-pair magnetic pole structure. For a hydro-turbine generator with a rotation speed of 120 revolutions per minute, the rotor has 25 pairs of magnetic poles. The rotor speed of a 700MW hydro-turbine generator at the Three Gorges Power Station is 75r / min (75 revolutions per minute) and uses 40 pairs of magnetic poles. Due to the large number of magnetic poles and the large size, a vertical shaft structure is adopted. The hydro-turbine generator set in this application only considers the vertical shaft structure.

[0050] Guide bearing: In this application, since the hydro-turbine generator is a heavy equipment, the bearing load is very large during movement, and sliding bearings with strong load capacity are usually used. Oil-immersed sliding bearings are mostly used in large hydro-turbine generator sets. The guide bearing mainly bears the mechanical imbalance force of the rotor and the unilateral magnetic pull caused by the eccentricity of the rotor. Its main function is to prevent the swing of the rotating shaft. The guide bearing is composed of main components such as bearing shells, support bolts, bearing seats, and rotating shafts. During the operation of the hydro-turbine generator set, the rotating shaft is the moving part and the others are stationary parts. The bearing shell is the part that contacts the rotating shaft and is fixed to the bearing seat by support bolts. A gap is set between the bearing shell and the rotating shaft, and the gap is usually filled with lubricating oil. The bearing shell is the direct force-bearing part of the force generated by the rotating shaft during movement.

[0051] Embodiments of the present application provide a method, device, and storage medium for detecting a rotation axis offset position.

[0052] The rotation axis offset position detection method may be integrated into an electronic device, which may be a terminal device or a main control panel.

[0053] In some embodiments, the terminal can be an independent device, such as a mobile phone, tablet computer, smart Bluetooth device, laptop computer, or personal computer (PC), which can function as both a memory and a processor. Specifically, the device functions as a memory for storing instructions, and the device also functions as a processor to load instructions from the memory to execute the rotation axis offset position detection method of the present application. The device is connected to a rotation axis offset position detection device having a detection function, and transmits the instructions to the rotation axis offset position detection device so that the device can interpret the instructions and perform the corresponding detection action.

[0054] In some embodiments, the terminal can be a main control panel, which is used to realize human-computer interaction, and the main control panel is connected to a rotation axis offset position detection device having a rotation axis offset position detection function. The main control panel may include a microprocessor, a control, and a display screen, etc. The control is used to generate relevant operation instructions in response to user operations, so that the rotation axis offset position detection device performs corresponding actions according to the operation instructions, for example, starting / shutting down the rotation axis offset position detection device; the display screen is used to display various parameters generated when the rotation axis offset position detection device is working; the microprocessor can store the rotation axis offset position detection method of the present application and generate corresponding rotation axis offset position detection instructions so that the rotation axis offset position detection device can parse the instructions and perform corresponding detection actions. In addition, the microprocessor can receive and analyze data obtained when the rotation axis offset position detection device is working, and transmit the results to the display screen.

[0055] In some embodiments, the rotation axis offset position detection method can also be integrated into multiple electronic devices. For example, the rotation axis offset position detection method can be integrated into multiple terminals, and the rotation axis offset position detection method of the present application can be jointly implemented by multiple terminals, wherein each terminal can implement different functions of the rotation axis offset position detection method.

[0056] It should be noted that the serial numbers of the following embodiments are not intended to limit the preferred order of the embodiments.

[0057] Example 1

[0058] refer to Figure 1a , shows a schematic diagram of an application scenario of the rotation axis offset position detection method in this embodiment. Figure 1a As shown, this embodiment may include a rotation shaft offset position detection device 100, and the rotation shaft offset position detection device 100 includes a rotation shaft 110, a bearing 120, distance sensors 131-134, and a processor 140;

[0059] Specifically, when implementing the rotation shaft offset position detection method of the present application, the rotation shaft 110 is rotatably connected to the matching bearing 120; a rectangular coordinate system is established with the center of the radial section of the bearing 120 as the origin, and the rectangular coordinate system includes two coordinate axes, and each intersection of the coordinate axis and the bearing 120 is provided with a distance sensor, respectively recorded as distance sensors 131~134; the data measured by the distance sensors 131~134 are sent to the processor 140 for analysis and processing to generate corresponding rotation shaft offset position detection results.

[0060] In this embodiment, it will be described from the perspective of a processor, which can be integrated into a rotating shaft offset position detection device. First, for each of the coordinate axes, the thermal motion corresponding to the coordinate axis at the target time point can be calculated based on the distance value obtained by the distance sensor corresponding to the coordinate axis. The thermal motion reflects the relative diameter change of the rotating shaft and the bearing under the action of the temperature at the target time point; further, the axis center offset of the rotating shaft in the direction of the coordinate axis is calculated based on the distance value and the thermal motion obtained by the distance sensor under the same coordinate axis; finally, based on the axis center offset of the rotating shaft in the direction of each coordinate axis, the offset position of the rotating shaft relative to the origin at the target time point is calculated.

[0061] like Figure 1bAs shown, the process of the rotation shaft offset position detection method in this embodiment may include steps S110 to S130, wherein the rotation shaft is rotatably connected to a matching bearing; a rectangular coordinate system is established with the center of the radial section of the bearing as the origin, the rectangular coordinate system including two coordinate axes, and a distance sensor is provided at the intersection of each coordinate axis and the bearing:

[0062] S110. For each of the coordinate axes, calculate the thermal motion corresponding to the coordinate axis at a target time point based on the distance value obtained by the distance sensor corresponding to the coordinate axis, where the thermal motion reflects the change in relative diameter of the rotating shaft and the bearing under the action of the temperature at the target time point.

[0063] The distance sensor can be an optical distance sensor, an ultrasonic distance sensor, or other types, and is used to instantly obtain the distance value between the distance sensor's sensing probe and the rotating shaft. Distance sensors typically acquire data at a certain sampling frequency. This application defines the moment of a single sampling as the target time point for that sampling. The two distance sensors on the same coordinate axis can be of the same model and symmetrical about the mirror image section of the bearing. Under these conditions, the distance values ​​measured by the two distance sensors should be equal when the rotating shaft is in a non-operating, stationary state.

[0064] The thermal motion is used to reflect the relative diameter change between the rotating shaft and the bearing under the action of the temperature at the target time point. Specifically, Figure 2a As shown, the rotating shaft is located in the middle of the bearing. In the static state, the axis center of the rotating shaft radial section coincides with the center of the bearing radial section. There is a certain gap between the inner ring of the bearing and the axis center. The image is only used to show the relative position relationship between the rotating shaft and the bearing, and does not represent the real scale. The actual gap size is much smaller than the ratio shown in the figure. The bearing body can be regarded as a circular cylinder, and the corresponding radial section of the bearing can be regarded as a circular ring. The geometric structure of the rotating shaft can be regarded as a cylinder, and the corresponding radial section of the rotating shaft can be regarded as a circle. The inner diameter of the above-mentioned circular ring must be larger than the diameter of the circle to reserve enough space for the rotating shaft to rotate. Φ(t) is used to represent the inner diameter of the circular ring at the target time point. When t is 0, Φ(0) is used to represent the inner diameter of the circular ring in the initial state. It is used to represent the diameter of the circle at the target time point. When t is 0, that is, It is used to represent the diameter of the circle in the initial state. Therefore, the thermal motion is defined as the change in the bearing inner diameter at time t minus the change in the rotating shaft diameter, that is, the following formula (1):

[0065]

[0066] However, in the actual operation of a hydro-turbine generator set, it is difficult to calculate the thermal motion directly according to formula (1) due to the large difference in the magnitude of the change in the structure of the shaft system composed of the rotating shaft and its corresponding bearings, the diameter of the rotating shaft and the diameter of the bearings caused by temperature, and the uneven deformation caused by temperature. Therefore, the present application adopts a rectangular coordinate system with the center of the radial section of the bearing as the origin. The rectangular coordinate system includes two coordinate axes, and each intersection of the coordinate axis and the bearing is provided with a distance sensor. The thermal motion is indirectly calculated based on the distance value measured by the distance sensor. Specifically, as Figure 2b As shown, two distance sensors are installed at the intersection of the X-axis of the rectangular coordinate system and the inner ring, which can be recorded as distance sensor 1 and distance sensor 2. At the target time point, the distance value measured by distance sensor 1 is recorded as δ1(), and the distance value measured by distance sensor 2 is recorded as δ2(). The above distance values ​​can be used to indirectly obtain the thermal motion amount in the X-axis direction at the target time point, and the thermal motion amount in the Y-axis direction can be obtained accordingly.

[0067] Therefore, in some embodiments, the distance value includes an initial distance and a movement distance at a target time point, wherein the initial distance is a distance value obtained by detecting when the unit is just installed; in some embodiments, the initial distance may also be a distance value obtained by detecting after the hydropower unit is refurbished and the rotating shaft is reset; both of the above two detection time points are before the unit starts to operate and are not affected by factors such as temperature changes and force changes generated after the unit is operated.

[0068] for Figure 2b For the two sensors located in the X-axis direction, the initial distances measured can be recorded as δ1(0) and δ2(0) respectively; the movement distance at the target time point is the distance value measured by the two sensors at the target time point, which can be recorded as δ1() and δ2() respectively, where t is not equal to 0. The thermal motion is calculated using the following formula (2):

[0069] Δt=[δ1(t)+δ2(t)]-[δ1(0)+δ2(0)] (2)

[0070] Therefore, step S110 can be further expressed as: calculating the thermal motion corresponding to the coordinate axis at the target time point based on the initial distance obtained by the distance sensor corresponding to the coordinate axis and the movement distance at the target time point, where the initial distance is the distance value detected by the distance sensor when the unit is installed.

[0071] In the above embodiment, by setting a coordinate system on the radial section of the bearing, setting a distance sensor between the coordinate axis of the coordinate system and the focus of the bearing, and indirectly calculating the thermal motion based on the distance value measured by the distance sensor, the problem of difficulty in directly obtaining the bearing diameter and the rotating shaft diameter during the operation of the hydro-turbine generator set is effectively solved.

[0072] S120 , calculating an axis center offset of the rotation axis in the direction of the coordinate axis according to the distance value acquired by the distance sensor under the same coordinate axis and the thermal motion.

[0073] Among them, the absolute value of the axis offset is the projection distance of the axis of the rotating axis in the rectangular coordinate system in the direction of the coordinate axis at the target time point. The axis offset can have a positive or negative sign, and the positive or negative sign is used to indicate that the projection position of the axis on the coordinate axis is on the positive axis or the negative axis.

[0074] In some embodiments, the calculation of the axis center offset in S120 may be specifically expanded into the following calculation processes S121 to S122:

[0075] S121, selecting a distance sensor from the distance sensors corresponding to the coordinate axes, and recording the distance sensor as a reference distance sensor;

[0076] S122. Calculate the axis center offset of the rotation axis in the direction of the coordinate axis based on the initial distance acquired by the reference distance sensor under the same coordinate axis, the movement distance at the target time point, and the thermal motion corresponding to the coordinate axis where the reference distance sensor is located.

[0077] Specifically, refer to Figure 2b Since the reference distance sensor is any one of the distance sensors corresponding to the coordinate axis, in this embodiment, distance sensor 1 is set as the reference distance sensor, and the offset of the axis center on the X-axis at the target time point can be calculated according to the following formula (3):

[0078] x t =δ1(t)-δ1(0)-Δt / 2 (3)

[0079] The calculated offset x of the axis on the X axis t It can have positive and negative signs. When the sign is positive, it means that the projection position of the axis on the X-axis is located on the positive axis of the X-axis, and when the sign is negative, it means that the projection position of the axis on the X-axis is located on the negative axis of the X-axis. It can be understood that in the formula (3) for calculating the offset, sensor 2 can be set as the reference distance sensor. In this case, the calculation formula for the offset on the X-axis is:

[0080] x t =δ2(r)-δ2(0)-Δt / 2

[0081] In this case, when the sign of the offset is positive, it indicates that the projection of the axis on the X-axis is located on the negative axis of the X-axis, while when the sign is negative, it indicates that the projection of the axis on the X-axis is located on the positive axis of the X-axis. The selection of the reference distance sensor is determined by the technician and should not be construed as a limitation of this application. The axis offset on the Y-axis can be calculated using the same formula based on the distance value measured by the Y-axis distance sensor and the thermal motion in the Y-axis direction, and will not be further described here.

[0082] S130: Calculate the offset position of the rotation axis relative to the origin at the target time point based on the axis center offset of the rotation axis in the direction of each coordinate axis.

[0083] Specifically, for example Figure 3 As shown ( Figure 3 In order to more intuitively show the displacement, the rotation axis is reduced. The relative size of the rotation axis and the bearing in the figure does not represent the scale of the actual machine. At a certain point in time, the distance sensor at the negative axis position of the X axis is used as the reference distance sensor. The calculated x t is a negative value; take the distance sensor at the negative axis position of the Y axis as the reference distance sensor, and calculate the offset y of the axis center on the Y axis t It is also a negative value; it can be determined that the offset position of the rotation axis relative to the origin at the target time point is located in the third quadrant of the rectangular coordinate system, and the coordinates are (-|x t |,-|y t |).

[0084] In some embodiments, the target time point is any one of multiple time points included in a detection period. The detection period is a preset detection time period, generally designed to be the time required for the rotation axis to rotate one circle. The multiple time points included in the detection period can be evenly distributed in the detection period at fixed time intervals. After calculating the offset position of the rotation axis relative to the origin at the target time point, the rotation axis offset position detection method further includes the following loop process S140-S142:

[0085] S140, determining whether the target time point is the last time point of the detection period;

[0086] Among them, the method for judging whether the target time point is the last time point of the detection period can be: setting a virtual counter, and each time the distance sensor performs distance detection, the value of the virtual counter is increased by one. When the value of the virtual counter reaches the total number of time points in the detection period, it can be judged that the target time point is the last time point of the detection period.

[0087] If not, S141: take the next time point as the target time point, and control the distance sensor to perform distance detection at the target time point to obtain a distance value corresponding to the target time point;

[0088] Jump to step: for each of the coordinate axes, calculate the thermal motion corresponding to the coordinate axis at the target time point according to the distance value obtained by the distance sensor corresponding to the coordinate axis;

[0089] S142: If yes, obtain the motion trajectory of the axis of the rotating shaft within the detection period according to all offset positions.

[0090] The motion trajectory can be obtained by connecting the axis positions of adjacent time points within the detection period, for example, by connecting the coordinate points (x t ,y t ) and the coordinate point (x t+1 ,y t+1 ), where t = 1, 2…, n-1, and n is the total number of time points in the detection period. In some embodiments, the motion trajectory can be made smoother by interpolation, and the interpolation method can be neighbor interpolation, median interpolation, Lagrange interpolation, etc., or a combination of multiple methods. It is understood that whether the motion trajectory is smoothed and the smoothing method used for smoothing are determined by the needs of technicians and should not be understood as limiting the present application.

[0091] In some embodiments, before determining whether the target time point is the last time point of the detection period, the method of the present application may further include running gap calculation steps A1 and A2:

[0092] A1. For each coordinate axis, calculate the running clearance corresponding to the coordinate axis based on the thermal motion corresponding to the coordinate axis;

[0093] A2. Obtaining the actual running clearance at the target time point based on the running clearance, where the actual running clearance is used to reflect half of the maximum displacement that the rotating shaft can move in the direction of the bearing diameter.

[0094] like Figure 4 As shown, when the bearing is installed, a certain installation distance is set between each bearing shell and the rotating shaft, and the installation distances are all the same, that is, Figure 4 The distance C in the installation distance actually limits the upper limit of the axis displacement. When the hydro-generator set is running, in addition to the displacement of the rotating shaft due to the force, the distance between the bearing and the rotating shaft will also change accordingly due to the deformation caused by temperature. Therefore, this application defines the operating clearance as: the maximum absolute displacement of the axis of the rotating shaft in the coordinate axis direction at the target time point, denoted by Cr (t) indicates that the running clearance is calculated by the following formula (4). When t = 0, C r (t)=C,

[0095] C r (t)=C-Δt / 2, (4)

[0096] Obviously, the running clearance calculated using Formula 4 above is dependent on the coordinate axis direction. That is, the calculated running clearance may be different in different coordinate axis directions. Furthermore, the minimum running clearance in all coordinate axis directions can be taken as the measured running clearance. This value approximates the minimum distance between all bearings and the rotating shaft at the target time point. In other words, the measured running clearance can reflect half of the maximum displacement that the rotating shaft can move in the direction of the bearing diameter.

[0097] When the method of the present application includes a running clearance calculation step, after obtaining the motion trajectory of the axis of the rotating shaft within the detection period based on all offset positions, the method of the present application may include the following running clearance curve acquisition step:

[0098] A3. Obtain the running clearance curve based on all saved measured running clearances.

[0099] The running gap curve can be obtained by establishing a measured running gap-time point coordinate system, wherein the horizontal axis is the time point t=1, 2…, n counted by the time interval, n is the total number of time points in the detection period, and the vertical axis is the value of the measured running gap, that is, the coordinate of the midpoint of the coordinate system is (t, C r (t)); the running clearance curve is obtained by connecting the points sequentially in time. Generally speaking, when the detection period is short, the temperature change is small, and the resulting thermal motion is small, resulting in almost no change in the measured running clearance during the detection period. In this case, the generated running clearance curve is approximately a circle.

[0100] In some embodiments, the running clearance curve may be made smoother by interpolation. The interpolation method is the same as above and will not be described again here.

[0101] In some embodiments, the error interval of the measured operating clearance can be set based on experience, and an operating clearance curve with an error limit can be established based on the confidence interval. By setting the error limit, the measurement result can be closer to the actual value, reducing the possibility of misjudgment.

[0102] In some embodiments, the running clearance curve may be converted into a polar coordinate form, and the converted running clearance curve may be set in a rectangular coordinate system where the motion trajectory is located, to facilitate subsequent comparison processing.

[0103] In the above embodiment, the operating stability of the turbine bearing can be effectively determined by obtaining the operating clearance curve and using the operating clearance curve to determine whether a large oscillation occurs.

[0104] In some embodiments, the running clearance curve and the motion trajectory can be used to measure the running stability of a shaft system consisting of a rotating shaft and its matching bearings, specifically including the following step B1:

[0105] B1. Determine the degree of oscillation during the detection period based on the running clearance curve and the trajectory deviation, where the degree of oscillation is used to reflect the stability of the guide bearing.

[0106] The degree of oscillation refers to the state in which the center of the rotating shaft is offset relative to the center of the bearing. When the trajectory deviation curve shows large fluctuations, that is, the absolute value of the curve gradient exceeds the preset range; or the absolute value of the difference between the offset indicated by the motion trajectory and the upper limit of the displacement limited by the running clearance curve is less than the preset range, it means that the distance between the shaft and the bearing at this moment is extremely small. It can be considered that a large oscillation has occurred at this time, and the operation of the guide bearing is unstable, or even a fault may have occurred.

[0107] Specifically, if Figure 5 As shown, the inner curve is the axis motion trajectory of the rotating shaft during the detection period, and the outer curve is the operating clearance curve. The points on the outer circle of the operating clearance curve represent half of the maximum axis displacement at each sampling time point, which limits the maximum displacement of the axis at that sampling time point. Generally speaking, the axis motion trajectory must be inside the operating clearance curve and maintain an appropriate distance from the operating clearance curve to maintain stable unit operation. A distance between the operating clearance curve and the axis motion trajectory that is too large or too small may cause operational problems in the unit: when the distance is too large, it may cause unstable contact between the shaft and the bearing; when the distance is too small, large oscillation may occur, leading to unit failure.

[0108] Figure 5 This example shows a situation where the distance between the running clearance curve and the axis's trajectory is too small. It can be seen that during the detection period, the rotating shaft deviated toward the third quadrant, and when it moved to the third quadrant, it was closest to the running clearance curve. At this time, the absolute difference between the offset indicated by the trajectory and the upper limit of displacement limited by the running clearance curve was less than the preset range, indicating a high probability of significant runout.

[0109] In the above embodiment, by using the operating clearance curve and the trajectory deviation to determine the degree of oscillation in the detection period, it is possible to more accurately analyze whether the turbine unit bearing is operating stably, which helps technicians maintain the bearings based on the analysis results.

[0110] In some embodiments, after obtaining the degree of oscillation during the detection period, if the processor determines that the degree of oscillation meets a preset alarm condition, the method of the present application may further include the following alarm processes C1 to C2:

[0111] C1. When the vibration degree meets the preset alarm condition, generate an alarm message;

[0112] C2. Sending the warning information to the user so that the user can adjust the operating parameters of the guide bearing accordingly according to the warning information.

[0113] An alarm system can be deployed within a processor connected to the sensor. The system can store various calculated data and information. Preset alarm conditions can include when the absolute value of the curve gradient exceeds a preset range, or when the absolute value of the difference between the offset indicated by the motion trajectory and the upper limit of the displacement limited by the operating clearance curve is less than a preset range. When analysis determines that the hydro-generator set has indeed experienced an operational anomaly, a text file is generated based on the specific information about the anomaly and promptly sent to the user so that the user can make appropriate adjustments to the hydro-generator set. The text file can be sent via email, text message, office communication software, etc.

[0114] In an embodiment of the present application, a method is used to collect distance values ​​in real time by using multiple distance sensors, obtain thermal motion based on the distance values, and finally obtain an offset based on the thermal motion and the distance values. The offset obtained takes into account the influence of temperature changes during operation, and can more accurately detect the offset position of the rotating shaft, and can determine the degree of vibration based on the offset position, thereby helping technicians to understand the status of the bearing during operation so as to perform corresponding maintenance based on the bearing status.

[0115] Example 2

[0116] refer to Figure 6a , shows a schematic diagram of an application scenario of a specific embodiment of the rotation axis offset position detection method in this embodiment. Figure 6a As shown, this embodiment is applied to a hydro-generator set 600. The hydro-generator set 600 includes a processor 610 connected to at least one distance sensor set 620. The distance sensor set 620 is disposed on a guide bearing 630 and is used to obtain the distance value in the guide bearing 630 during operation of the hydro-generator set. The guide bearing 630 includes a rotating shaft and a matching bearing, the rotating shaft being rotatably connected to the bearing. A rectangular coordinate system is established with the center of the radial section of the bearing as the origin. The rectangular coordinate system includes two coordinate axes. A distance sensor is disposed at the intersection of each coordinate axis and the bearing. Together, all distance sensors constitute the distance sensor set 620.

[0117] Processor 610: controls the sensor group 620 to start data acquisition; obtains the distance value transmitted by the sensor group 620; calculates the thermal motion amount within the detection period based on the distance value; calculates the axis offset of the rotating shaft based on the distance value and the thermal motion amount; calculates all offset positions of the rotating shaft relative to the origin within the detection period based on the axis offset; calculates the running trajectory of the offset position within the detection period; calculates the measured running gap based on the thermal motion amount; obtains the running gap curve based on the measured running gap; and determines the degree of vibration in the detection period based on the running gap curve and the running trajectory.

[0118] The sensor group 620 collects data in response to the instructions of the processor 610 and transmits the detected distance value to the processor 610 .

[0119] In this embodiment, description will be made from the perspective of the rotation axis offset position detection device.

[0120] like Figure 6b As shown, in this embodiment, the implementation subject of the rotation axis offset position detection method is a processor, and the process of the rotation axis offset position detection method is as follows: Steps S601 to S609:

[0121] S601, controlling the sensor group to start data collection;

[0122] S602, obtaining a distance value transmitted by the sensor group;

[0123] S603, calculating the thermal motion amount within the detection period according to the distance value;

[0124] S604, calculating the axis center offset of the rotation axis according to the distance value and the thermal motion;

[0125] S605: Calculate all offset positions of the rotation axis relative to the origin during the detection period based on the axis center offset;

[0126] S606, running trajectory of the offset position within the detection period;

[0127] S607, calculating the measured operating clearance based on the thermal motion;

[0128] S608. Obtaining a running clearance curve based on the measured running clearance;

[0129] S609: Determine the degree of oscillation in the detection period according to the running clearance curve and the running trajectory.

[0130] The steps included in the rotation shaft offset position detection method of this embodiment are basically consistent with the specific execution methods of the steps in Example 1, and will not be repeated here.

[0131] As can be seen from the above, in the embodiment of the present application, by using multiple distance sensors to collect distance values ​​in real time, obtaining thermal motion based on the distance values, and finally obtaining an offset based on the thermal motion and the distance value, the obtained offset takes into account the influence of temperature changes during operation, and can more accurately detect the offset position of the rotating shaft, and can determine the degree of vibration based on the offset position, thereby helping technicians to understand the status of the bearings during operation, so as to perform corresponding maintenance on the hydro-turbine generator set according to the bearing status.

[0132] In order to better implement the above method, an embodiment of the present application provides a rotation axis offset position detection device, which can be specifically integrated into an electronic device, which can be a terminal, server or other device. The electronic device is connected to the rotation axis offset position detection device, and controls the rotation axis offset position detection device to perform a preset detection action through instructions. In some embodiments, the terminal can be an independent device, such as a mobile phone, a tablet computer, a smart Bluetooth device, a laptop computer, or a personal computer (PC). The device can serve as both a memory and a processor. The device is used as a memory to store instructions, and the device also serves as a processor to load instructions from the memory to execute the rotation axis offset position detection method of the present application; the device is connected to a rotation axis offset position detection device having a rotation axis offset position detection function, and transmits the instructions to the rotation axis offset position detection device so that the device can parse the instructions and perform the corresponding detection action.

[0133] In some embodiments, the terminal can be a main control panel, which is used to implement human-computer interaction and is connected to a rotation axis offset position detection device having a rotation axis offset position detection function. The main control panel may include a microprocessor, multiple controls, a display screen, etc. The controls are used to generate relevant operating instructions in response to user operations, so that the rotation axis offset position detection device performs corresponding actions according to the operating instructions; the display screen is used to display various parameters generated by the rotation axis offset position detection device during operation; the microprocessor can store the rotation axis offset position detection method of the present application and generate corresponding rotation axis offset position detection instructions, so that the rotation axis offset position detection device can interpret the instructions and perform corresponding detection actions.

[0134] For example, in this embodiment, the method of the embodiment of the present application will be described in detail from the perspective of the rotation axis offset position detection device, taking the rotation axis offset position detection device specifically integrated into the rotation axis offset position detection equipment as an example.

[0135] For example, Figure 7 As shown, the rotation axis offset position detection device 700 may include a thermal motion unit 710 , an offset unit 720 , and an offset position unit 730 .

[0136] a thermal motion quantity unit 710 for calculating, for each coordinate axis, a thermal motion quantity corresponding to the coordinate axis at a target time point based on a distance value acquired by a distance sensor corresponding to the coordinate axis, wherein the thermal motion quantity reflects a change in the relative diameter of the rotating shaft and the bearing under the influence of the temperature at the target time point;

[0137] An offset unit 720 is configured to calculate an axis center offset of the rotation axis in the direction of the coordinate axis based on the distance value obtained by the distance sensor under the same coordinate axis and the thermal motion;

[0138] The offset position unit 730 is configured to calculate the offset position of the rotation axis relative to the origin at the target time point based on the axis center offset of the rotation axis in the direction of each coordinate axis.

[0139] In some embodiments, the distance value includes an initial distance and a movement distance at a target time point, and the thermal motion unit is used to:

[0140] The thermal motion amount corresponding to the coordinate axis at the target time point is calculated based on the initial distance obtained by the distance sensor corresponding to the coordinate axis and the motion distance at the target time point. The initial distance is the distance value detected by the distance sensor when the unit is installed.

[0141] In some embodiments, the offset unit further comprises:

[0142] a reference determination subunit, configured to select a distance sensor from the distance sensors corresponding to the coordinate axes, the distance sensor being recorded as a reference distance sensor;

[0143] The offset quantum unit is used to calculate the axis center offset of the rotation axis in the direction of the coordinate axis based on the initial distance obtained by the reference distance sensor under the same coordinate axis, the movement distance at the target time point, and the thermal motion corresponding to the coordinate axis where the reference distance sensor is located.

[0144] In some embodiments, the target time point is any one of a plurality of time points included in the detection period, and the rotation axis offset position detection unit further includes:

[0145] The judgment subunit is used to:

[0146] Determining whether the target time point is the last time point of the detection period;

[0147] and an execution subunit for:

[0148] If not, taking the next time point as the target time point, controlling the distance sensor to perform distance detection at the target time point, so as to obtain the distance value corresponding to the target time point;

[0149] Jump to step: for each of the coordinate axes, calculate the thermal motion corresponding to the coordinate axis at the target time point according to the distance value obtained by the distance sensor corresponding to the coordinate axis;

[0150] If so, the motion trajectory of the axis of the rotating shaft within the detection period is obtained according to all the offset positions.

[0151] In some embodiments, the rotation axis offset detection device further includes:

[0152] a first running clearance unit, configured to calculate, for each of the coordinate axes, a running clearance corresponding to the coordinate axis based on the thermal motion amount corresponding to the coordinate axis;

[0153] a second running clearance unit, configured to obtain a measured running clearance at the target time point based on the running clearance, wherein the measured running clearance is used to reflect an upper limit of an axis deviation of the rotating shaft at the target time point;

[0154] The clearance curve unit is used to obtain the running clearance curve according to all the saved measured running clearances.

[0155] In some embodiments, the rotation axis offset detection device further includes:

[0156] a deviation detection unit, configured to obtain a trajectory deviation between the motion trajectory and a standard motion trajectory, wherein the standard motion trajectory is a motion trajectory of the rotating shaft under preset standard conditions;

[0157] The swing judgment unit is used to judge the swing degree in the detection period according to the running clearance curve and the track deviation, and the swing degree is used to reflect the stability of the guide bearing operation.

[0158] In some embodiments, the rotation axis offset detection device further includes:

[0159] an alarm generating unit, configured to generate an alarm message when the vibration degree meets a preset alarm condition;

[0160] The alarm sending unit is used to send the alarm information to the user so that the user can adjust the operating parameters of the guide bearing accordingly according to the alarm information.

[0161] In specific implementation, the above units can be implemented as independent entities, or can be arbitrarily combined to be implemented as the same or several entities. The specific implementation of the above units can be found in the previous method embodiments and will not be repeated here.

[0162] From the above, it can be seen that the rotating shaft offset detection device provided by the present application can collect distance values ​​in real time by using multiple distance sensors, obtain thermal motion based on the distance value, and finally obtain the offset based on the thermal motion and the distance value. The obtained offset takes into account the influence of temperature changes during operation, and can more accurately detect the offset position of the rotating shaft, and can determine the degree of vibration based on the offset position, thereby helping technicians to understand the status of the bearing during operation, so as to perform corresponding maintenance according to the bearing status.

[0163] An embodiment of the present application further provides a rotation axis offset detection system, which can be a device such as a terminal or a server.

[0164] For example, the terminal can be a mobile phone, a tablet computer, a smart Bluetooth device, a laptop computer, a personal computer, or other devices; the server can be a single server or a server cluster consisting of multiple servers.

[0165] In this embodiment, the rotation axis offset detection system of this embodiment is a server as an example for detailed description, for example, Figure 8 As shown, it shows a schematic diagram of the structure of the server involved in the embodiment of the present application, specifically:

[0166] The rotation axis offset detection system may include one or more processing core processors 801, one or more computer readable storage media memories 802, a power supply 803, an input module 804, and a communication module 805. Those skilled in the art will appreciate that Figure 8 The structure of the rotation axis offset detection system shown in the figure does not constitute a limitation on the rotation axis offset detection system, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0167] Processor 801 is the control center of the rotation axis offset detection system. It connects the various components of the entire rotation axis offset detection system using various interfaces and circuits. By running or executing software programs and / or modules stored in memory 802 and accessing data stored in memory 802, it performs various functions of the rotation axis offset detection system and processes data, thereby providing overall monitoring of the rotation axis offset detection system. In some embodiments, processor 801 may include one or more processing cores. In some embodiments, processor 801 may integrate an application processor and a modem processor. The application processor primarily processes the operating system, user interfaces, and application programs, while the modem processor primarily handles wireless communications. It is understood that the modem processor may not be integrated into processor 801.

[0168] The memory 802 can be used to store software programs and modules. The processor 801 executes various functional applications and data processing by running the software programs and modules stored in the memory 802. The memory 802 may mainly include a program storage area and a data storage area. The program storage area may store an operating system, at least one application required for a function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created based on the use of the rotation axis offset detection system, etc. In addition, the memory 802 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 802 may also include a memory controller to provide the processor 801 with access to the memory 802.

[0169] The rotation axis offset detection system also includes a power supply 803 for supplying power to various components. In some embodiments, the power supply 803 can be logically connected to the processor 801 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The power supply 803 can also include one or more DC or AC power supplies, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and other arbitrary components.

[0170] The rotation axis offset detection system may further include an input module 804 , which may be configured to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0171] The rotation axis offset detection system may further include a communication module 805. In some embodiments, the communication module 805 may include a wireless module. The rotation axis offset detection system may utilize the wireless module of the communication module 805 for short-range wireless transmission, thereby providing users with wireless broadband Internet access. For example, the communication module 805 may be used to enable users to send and receive emails, browse web pages, and access streaming media.

[0172] Although not shown, the rotation axis offset detection system may further include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 801 in the rotation axis offset detection system loads the executable files corresponding to one or more application processes into the memory 802 according to the following instructions. The processor 801 then runs the application stored in the memory 802 to implement various functions as follows:

[0173] For each of the coordinate axes, calculating a thermal motion corresponding to the coordinate axis at a target time point based on a distance value obtained by a distance sensor corresponding to the coordinate axis, wherein the thermal motion reflects a change in relative diameter between the rotating shaft and the bearing under the influence of the temperature at the target time point;

[0174] Calculating an axis center offset of the rotation axis in the direction of the coordinate axis based on the distance value acquired by the distance sensor under the same coordinate axis and the thermal motion;

[0175] Based on the axis center offset of the rotation axis in the direction of each of the coordinate axes, the offset position of the rotation axis relative to the origin at the target time point is calculated.

[0176] The specific implementation of the above operations can be found in the previous embodiments and will not be repeated here.

[0177] From the above, it can be seen that in the rotating shaft offset detection system provided in the embodiment of the present application, multiple distance sensors can be used to collect distance values ​​in real time, thermal motion can be obtained based on the distance values, and finally the offset can be obtained based on the thermal motion and the distance value. The obtained offset takes into account the influence of temperature changes during operation, and can more accurately detect the offset position of the rotating shaft, and can determine the degree of vibration based on the offset position, thereby helping technicians to understand the status of the bearing during operation so as to perform corresponding maintenance based on the bearing status.

[0178] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be accomplished by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0179] To this end, an embodiment of the present application provides a computer-readable storage medium storing a plurality of instructions that can be loaded by a processor to execute the steps of any of the rotation axis offset position detection methods provided in the embodiments of the present application. For example, the instructions can execute the following steps:

[0180] For each of the coordinate axes, calculating a thermal motion corresponding to the coordinate axis at a target time point based on a distance value obtained by a distance sensor corresponding to the coordinate axis, wherein the thermal motion reflects a change in relative diameter between the rotating shaft and the bearing under the influence of the temperature at the target time point;

[0181] Calculating an axis center offset of the rotation axis in the direction of the coordinate axis based on the distance value acquired by the distance sensor under the same coordinate axis and the thermal motion;

[0182] Based on the axis center offset of the rotation axis in the direction of each of the coordinate axes, the offset position of the rotation axis relative to the origin at the target time point is calculated.

[0183] Since the instructions stored in the storage medium can execute the steps in any of the rotation axis offset position detection methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any of the rotation axis offset position detection methods provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0184] The above is a detailed introduction to a method and device for detecting the offset position of a rotating shaft provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for detecting the offset position of a rotating shaft, characterized in that: The rotating shaft is rotatably connected to a matching bearing; a rectangular coordinate system is established with the center of the radial section of the bearing as the origin, the rectangular coordinate system including two coordinate axes, and a distance sensor is provided at the intersection of each coordinate axis and the bearing; The method comprises: For each of the coordinate axes, calculating a thermal motion corresponding to the coordinate axis at a target time point based on a distance value obtained by a distance sensor corresponding to the coordinate axis, wherein the thermal motion reflects a change in relative diameter between the rotating shaft and the bearing under the influence of the temperature at the target time point; Calculating an axis center offset of the rotation axis in the direction of the coordinate axis based on the distance value acquired by the distance sensor under the same coordinate axis and the thermal motion; Based on the axis center offset of the rotation axis in the direction of each of the coordinate axes, the offset position of the rotation axis relative to the origin at the target time point is calculated.

2. A method for detecting a rotation axis offset position according to claim 1, characterized in that: The distance value includes the initial distance and the movement distance at the target time point; Calculating the thermal motion amount corresponding to the coordinate axis at the target time point based on the distance value obtained by the distance sensor corresponding to the coordinate axis includes: The thermal motion amount corresponding to the coordinate axis at the target time point is calculated based on the initial distance obtained by the distance sensor corresponding to the coordinate axis and the motion distance at the target time point. The initial distance is the distance value detected by the distance sensor when the unit is installed.

3. A method for detecting a rotation axis offset position according to claim 2, characterized in that: Calculating the axis center offset of the rotation axis in the direction of the coordinate axis according to the distance value obtained by the distance sensor under the same coordinate axis and the thermal motion, including: Select a distance sensor from the distance sensors corresponding to the coordinate axes, and record the distance sensor as a reference distance sensor; The axis center offset of the rotation axis in the direction of the coordinate axis is calculated according to the initial distance obtained by the reference distance sensor under the same coordinate axis, the movement distance at the target time point, and the thermal motion corresponding to the coordinate axis where the reference distance sensor is located.

4. The method for detecting the offset position of a rotating shaft according to claim 1, wherein: The target time point is any one of the multiple time points included in the detection period; After calculating the offset position of the rotation axis relative to the origin at the target time point, the method further includes: Determining whether the target time point is the last time point of the detection period; If not, taking the next time point as the target time point, controlling the distance sensor to perform distance detection at the target time point, so as to obtain the distance value corresponding to the target time point; Jump to step: for each of the coordinate axes, calculate the thermal motion corresponding to the coordinate axis at the target time point according to the distance value obtained by the distance sensor corresponding to the coordinate axis; If so, the motion trajectory of the axis of the rotating shaft within the detection period is obtained according to all the offset positions.

5. A method for detecting a rotation axis offset position according to claim 4, characterized in that: The determining whether the target time point is before the last time point of the detection period includes: For each of the coordinate axes, calculating the running clearance corresponding to the coordinate axis based on the thermal motion amount corresponding to the coordinate axis; obtaining a measured running clearance at the target time point according to the running clearance, wherein the measured running clearance is used to reflect half of the maximum displacement that the rotating shaft can move in the diameter direction of the bearing; After obtaining the motion trajectory of the axis center of the rotating shaft within the detection period according to all offset positions, the method includes: Obtain a running clearance curve based on all saved measured running clearances.

6. The rotation axis offset position detection method according to claim 5, wherein: After obtaining the running clearance curve, the method includes: The degree of oscillation in the detection period is determined according to the running clearance curve and the track deviation, and the degree of oscillation is used to reflect the stability of the guide bearing operation.

7. The rotation axis offset position detection method according to claim 6, wherein: After determining the degree of oscillation in the detection period according to the running clearance curve and the trajectory deviation, the method further includes: When the vibration level meets the preset alarm condition, an alarm message is generated; The warning information is sent to the user so that the user can adjust the operating parameters of the guide bearing accordingly according to the warning information.

8. A rotation axis offset position detection device, characterized in that: The rotating shaft is rotatably connected to a matching bearing; a rectangular coordinate system is established with the center of the radial section of the bearing as the origin, the rectangular coordinate system including two coordinate axes, and a distance sensor is provided at the intersection of each coordinate axis and the bearing; The device comprises: a thermal motion unit for calculating, for each of the coordinate axes, a thermal motion corresponding to the coordinate axis at a target time point based on a distance value acquired by a distance sensor corresponding to the coordinate axis, wherein the thermal motion reflects a change in relative diameter between the rotating shaft and the bearing under the influence of the temperature at the target time point; an offset unit, configured to calculate an axis center offset of the rotation axis in the direction of the coordinate axis based on the distance value obtained by the distance sensor under the same coordinate axis and the thermal motion; The offset position unit is used to calculate the offset position of the rotation axis relative to the origin at the target time point based on the axis center offset of the rotation axis in the direction of each coordinate axis.

9. A storage medium, characterized in that: The storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor to execute the rotation shaft offset position detection method according to any one of claims 1 to 7.

10. A rotation axis offset position detection system, characterized in that: include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the rotation shaft offset position detection method according to any one of claims 1 to 7.

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