A gap monitoring method and device for hoisting a hydro-generator rotor

Abstract

The present invention discloses a gap monitoring method and device for the hoisting of a hydro-turbine generator rotor, and relates to the field of hydro-turbine generators. The method comprises: moving the rotor to the top of the stator pit, so that the center of the rotor and the center of the stator are initially aligned; collecting the first distance between the stator and the rotor, and when any of the first distances is less than a preset value, stopping the hook drop, and adjusting the center of the rotor until the rotor drops to the preset calibration position of the stator; collecting the first distance and the second distance between the stator and the rotor, and calculating the minimum real-time distance between the rotor and the stator, and when the minimum real-time distance is less than a preset value, adjusting the center of the rotor and then continuing to drop the hook until the rotor falls onto the frame brake in the stator pit. The method can monitor the gap during the rotor hoisting process, and calculate the current minimum distance between the rotor and the stator based on the monitoring results, which not only enhances the accuracy of the determination, but also greatly saves manpower and avoids the risk of personnel operation.

Description

Technical Field

[0001] The invention relates to the field of hydro-generators, and in particular to a gap monitoring method and device for hoisting a rotor of a hydro-generator. Background Art

[0002] The rotor is an important part of the hydro-turbine generator. During the installation and maintenance of the hydro-turbine generator in the hydropower station, the motor rotor needs to be hoisted out and reinstalled. The rotor of the hydro-turbine generator in a large hydropower station usually has a large geometric size and equipment tonnage, and the allowable clearance range between the rotor and the stator during the hoisting process is small. Once the rotor and the stator are squeezed and collided during the hoisting process, serious equipment damage accidents will occur. At present, during the hoisting and reinstallation of the generator rotor, the gap between the stator and the rotor is mainly monitored by manual plugging. During this process, the staff holds the wooden plug and pulls it up and down continuously to timely detect whether there is any contact between the stator and the rotor; at the same time, the lifting commander constantly adjusts the position of the bridge crane and the trolley according to the contact position until the rotor is completely hoisted out or reinstalled into the stator pit. At present, the operation of hoisting or reinstalling the stator pit of this vertical hydro-turbine generator rotor mainly relies on the qualitative judgment of the operator, lacks quantitative judgment, has high safety risks, cumbersome personnel scheduling, and high labor intensity, which makes the hoisting operation inefficient, time-consuming, and costly, and there are certain safety hazards. Summary of the invention

[0003] The present invention provides a gap monitoring method and device for hoisting a hydro-generator rotor, which solves the above-mentioned technical problems.

[0004] A first aspect of an embodiment of the present invention provides a gap monitoring method for hoisting a hydro-turbine generator rotor, wherein the outer wall of the rotor of the hydro-turbine generator is provided with at least one first infrared ranging sensor, and the first infrared ranging sensor is used to measure a first vertical distance between the rotor and the ground;

[0005] A plurality of gap sensors are provided on the upper part of the stator of the hydro-turbine generator and along the inner wall of the stator, and a second infrared distance measuring sensor is equidistantly provided below each of the gap sensors, the gap sensor is used to measure a first distance between the stator and the rotor, and the second infrared distance measuring sensor is used to measure a second distance between the stator and the rotor;

[0006] The gap monitoring method comprises the following steps:

[0007] Step 1, move the rotor to the top of the stator pit, control the rotor to descend, so that the vertical distance between the bottom of the rotor and the top of the stator is less than a first preset value, and make the center of the rotor and the center of the stator preliminarily aligned;

[0008] Step 2, after the rotor is stable, continue to slowly drop the hook, collect the first distance between the stator and the rotor, and when any of the first distances is less than a second preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned twice, and then continue to drop the hook until the rotor drops to the preset calibration position of the stator;

[0009] Step 3, continue to slowly drop the hook, and simultaneously collect the first distance and the second distance between the stator and the rotor, calculate the minimum real-time distance between the rotor and the stator according to the first distance and the second distance, and when the minimum real-time distance is less than a third preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned, and then continue to drop the hook, and repeat this step until the rotor falls onto the frame brake in the stator pit.

[0010] A second aspect of an embodiment of the present invention provides a gap monitoring device for hoisting a hydro-generator rotor, comprising a first control module, a second control module and a third control module.

[0011] The first control module is used to move the rotor to the top of the stator pit, control the rotor to descend, so that the vertical distance between the bottom of the rotor and the top of the stator is less than a first preset value, and initially align the center of the rotor with the center of the stator;

[0012] The second control module is used to continue to slowly drop the hook after the rotor is stable, collect the first distance between the stator and the rotor, stop dropping the hook when any of the first distances is less than a second preset value, adjust the rotor center so that the rotor center and the stator center are aligned again, and then continue to drop the hook until the rotor drops to a preset calibration position of the stator;

[0013] The third control module is used to continue to slowly drop the hook, and simultaneously collect the first distance and the second distance between the stator and the rotor, calculate the minimum real-time distance between the rotor and the stator according to the first distance and the second distance, and when the minimum real-time distance is less than a third preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned, and then continue to drop the hook, and repeat this step until the rotor falls onto the frame brake in the stator pit.

[0014] The present invention provides a gap monitoring method and device for the hoisting of a hydro-turbine generator rotor, which can not only monitor the gap during the rotor hoisting process, but also calculate and predict the current minimum distance between the rotor and the stator based on the monitoring results, which not only enhances the judgment accuracy, but also reduces the cost while greatly saving manpower and avoiding the risk of personnel operation.

[0015] In order to make the above-mentioned objects, features and advantages of the invention more obvious and easy to understand, the preferred embodiments of the present invention are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a schematic diagram of the installation of various sensors during the hoisting process of the hydro-generator rotor provided in Example 1;

[0018] Figure 2 The present invention is a flow chart of a method for monitoring the gap of a hydro-generator rotor hoisting provided in Example 1;

[0019] Figure 3 This is a schematic diagram of the structure of a gap monitoring device for hoisting a hydro-turbine generator rotor provided in Example 2. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, all within the scope of protection of the present invention. In addition, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order from the module division in the device or the flow chart. Furthermore, the words "first", "second", "third", etc. used in the present invention do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0022] Figure 1 FIG. 1 is a schematic diagram of the installation of various sensors during the hoisting process of a hydro-generator rotor provided in Example 1. Figure 1The sensor includes a first infrared distance sensor 1, a gap sensor 2 and a second infrared distance sensor 3. Specifically, at least one first infrared distance sensor 1 is provided on the outer wall of the rotor 4 of the hydro-turbine generator, and the first infrared distance sensor 1 is used to measure the first vertical distance between the rotor 4 and the ground; a plurality of gap sensors 2 are provided on the upper part of the stator 5 of the hydro-turbine generator and along the inner wall of the stator, and a second infrared distance sensor 3 is equidistantly provided below each gap sensor 2, and the gap sensor 2 is used to measure the first distance between the stator 5 and the rotor 4, and the second infrared distance sensor 3 is used to measure the second distance between the stator 5 and the rotor 4. In the specific implementation process, the gap sensor 2 adopts an electric field displacement sensor. This sensor uses the electric field change between the sensor plate and the measured surface to reflect the distance between the two planes, thereby collecting the distance value between the rotor outer wall and the sensor installation position. Specifically, the air gap of each magnetic pole of the generator stator and rotor can be monitored in real time under steady-state conditions and all transition process conditions, and the gap value of each magnetic pole can be displayed in a table, a bar graph, and a real-time waveform. According to the monitoring results, the roundness of the generator stator and the roundness of the rotor parameters and curves can be given, as well as the minimum distance value and phase in real time, and the offset between the rotor center and the stator center can be given, so as to monitor and check the air gap unevenness, etc. The gap sensor of the preferred embodiment is in the form of a flat plate, suitable for installation between the stator and the rotor, and also has the characteristics of resistance to carbon powder and oil deposition, resistance to magnetic field interference, easy installation, no need to move the rotor and the magnetic poles, and non-contact, non-interference measurement.

[0023] In a more preferred embodiment, the inner wall of the stator 5 is provided with at least 6 evenly distributed gap sensors 2, for example 8, which are installed on the upper end surface of the inner wall of the stator and are installed at 45 degrees along the circumferential direction. The vertical distance between each gap sensor 2 and the top of the stator is equal, and the same number of second infrared distance sensors 3 are arranged corresponding to the gap sensors 2, that is, the second infrared distance sensors 3 can be installed on the lower end surface of the inner wall of the stator.

[0024] The outer wall of the rotor 4 of the hydro-turbine generator is provided with at least 4 evenly distributed first infrared ranging sensors 1, and each first infrared ranging sensor 1 is at the same vertical distance from the bottom of the rotor 4, thereby taking into account the accuracy of gap monitoring and the overall monitoring cost during the hoisting of the rotor 4. In actual application, the above sensors can be detachably installed on the rotor or stator by magnetic attraction or other means, so that the sensors that are not needed to be retained can be removed after the installation is completed, thereby improving the stability of the subsequent use of the hydro-turbine generator.

[0025] Figure 2 The flow chart of the gap monitoring method for the hoisting of the turbine generator rotor is provided in Example 1, as shown in FIG. Figure 2As shown, the following steps are included:

[0026] Step 1, move the rotor to the top of the stator pit, control the rotor to descend, so that the vertical distance between the bottom of the rotor and the top of the stator is less than a first preset value, and make the center of the rotor and the center of the stator preliminarily aligned;

[0027] Step 2, after the rotor is stable, continue to slowly drop the hook, collect the first distance between the stator and the rotor, and when any of the first distances is less than a second preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned twice, and then continue to drop the hook until the rotor drops to the preset calibration position of the stator;

[0028] Step 3, continue to slowly drop the hook, and simultaneously collect the first distance and the second distance between the stator and the rotor, calculate the minimum real-time distance between the rotor and the stator according to the first distance and the second distance, and when the minimum real-time distance is less than a third preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned, and then continue to drop the hook, and repeat this step until the rotor falls onto the frame brake in the stator pit.

[0029] The above embodiment provides a gap monitoring method for the hoisting of a hydro-turbine generator rotor. First, the hoisting process is divided into three alignment stages. The first stage is when the rotor is above the stator and is about to fall into the stator. The center of the rotor and the center of the stator are preliminarily aligned to avoid collision when the rotor is hoisted into the stator. The second stage is before the rotor enters the preset calibration position of the stator. This stage is mainly because the lower part of the rotor is prone to collision with the stator, and this stage is easily affected by environmental factors such as light. Therefore, a gap sensor is used to measure the first distance between the rotor and the stator, and when the first distance is too close, an alarm is issued in time and the center of the rotor is adjusted to avoid collision between the rotor and the stator. The third stage is when the rotor enters the lower half of the stator. At this time, the upper and lower parts of the rotor are prone to collision with the stator during the hoisting process, and the lower part is not easily affected by light because it is blocked by the rotor. Therefore, an infrared ranging sensor can be used instead of the gap sensor, which not only saves costs, but also can accurately measure the second distance between the stator and the rotor. At the same time, the gap sensor and the second infrared ranging sensor are both arranged on the inner wall of the stator. Although it is easier to disassemble, it can only directly obtain the distance between the rotor and the stator at the installation position. If the rotor is tilted and / or offset from the center of the stator, this measurement value may not be the minimum distance between the rotor and the stator. The method of this embodiment calculates the inclination and / or offset distance of the rotor relative to the central axis of the stator through the first distance, the second distance, etc., so as to obtain the minimum real-time distance, thereby making the gap monitoring data more accurate and further avoiding the collision between the rotor and the stator during the rotor lifting process.

[0030] The above steps are described in detail below through a number of specific embodiments.

[0031] In a specific embodiment, the step 1 specifically includes the following steps:

[0032] S101, moving the rotor to the top of the stator pit by two bridge cranes;

[0033] S102, continuously collecting the real-time distance between the rotor and the ground (the ground where the bottom of the stator pit is located) through the first infrared distance measuring sensor;

[0034] S103, acquiring the stator height and the installation position of the first infrared ranging sensor on the outer wall of the rotor, and calculating the real-time vertical distance between the bottom of the rotor and the top of the stator according to the real-time distance;

[0035] S104, when the real-time vertical distance is less than the first preset value, stop the hook drop, and adjust the inclination angle of the rotor and the position of the rotor center in the horizontal direction, so that the rotor and the stator center are preliminarily aligned. The adjustment step here mainly adopts a coarse adjustment method, such as comparing the first vertical distances corresponding to all first infrared ranging sensors, and combining the installation angle of the first infrared ranging sensor on the outer wall of the rotor to generate a corresponding bridge crane control instruction, thereby adjusting the inclination angle of the rotor to keep the rotor horizontal. Then adjust the position of the rotor center in the horizontal direction to preliminarily align the rotor and the stator center.

[0036] In a preferred embodiment, the step 2 specifically includes the following steps:

[0037] S201, obtaining a preset calibration position of the stator, a stator height, and an installation position of the first infrared ranging sensor on the outer wall of the rotor, and calculating and generating a target height between the rotor and the ground;

[0038] S202, continuously collecting a first distance between an inner wall of the stator and an outer wall of the rotor at a corresponding point through the gap sensor, and continuously collecting a real-time distance between the rotor and the ground through the first infrared ranging sensor;

[0039] S203, determining whether each first distance is less than a second preset value, and when any first distance is less than the second preset value, stopping the hook drop, and adjusting the inclination angle of the rotor according to the real-time vertical distances respectively collected by all the first infrared ranging sensors at the current moment, and adjusting the position of the rotor center in the horizontal direction according to the first distances respectively collected by all the gap sensors at the current moment;

[0040] S204, repeating steps S202-S203 until the real-time distance between the rotor and the ground is less than the target height, that is, the rotor falls to the preset calibration position of the stator.

[0041] In a preferred embodiment, the step 3 specifically includes the following steps:

[0042] S301, continuously collecting a first distance between a corresponding point on the inner wall of the stator and an outer wall of the rotor by means of the gap sensor, and continuously collecting a second distance between a corresponding point on the inner wall of the stator and an outer wall of the rotor by means of the second infrared ranging sensor at the same time;

[0043] S302, determining whether any of the first distances is less than a second preset value or whether any of the second distances is less than a third preset value, if so, stopping the hook drop and executing S304; if not, executing S303;

[0044] S303, simulating the real-time profile of the rotor in the stator according to all the first distances, all the second distances, the installation position of the gap sensor, and the installation position of the second infrared ranging sensor, generating the inclination angle and the offset distance of the rotor relative to the central axis of the stator according to the real-time profile, and calculating the minimum real-time distance between the rotor and the stator according to the inclination angle and the offset distance, if the minimum real-time distance is less than a third preset value, stopping the hook drop, and executing S304;

[0045] S304, adjusting the rotor center according to the tilt angle and the offset distance so that the rotor center and the stator center are aligned. This not only takes into account the data collected in real time by the gap sensor or infrared sensor, but also takes into account the smaller gaps that may exist during the lifting process, thereby further improving the safety of the rotor lifting.

[0046] In a preferred embodiment, the gap monitoring method also includes a prediction step, specifically: generating a minimum predicted distance between the outer wall of the rotor and the inner wall of the stator corresponding to a preset time point based on the first distance, the second distance and subsequent operating actions of the bridge crane; when the minimum predicted distance is less than a third preset value, stopping the hook and adjusting the rotor center.

[0047] In a preferred embodiment, the minimum predicted distance between the outer wall of the rotor and the inner wall of the stator corresponding to a preset time point is generated according to the first distance, the second distance and the subsequent operation of the bridge crane, specifically:

[0048] Simulating a real-time profile of the rotor in the stator according to the first distance, the second distance, the installation position of the gap sensor, and the installation position of the second infrared ranging sensor;

[0049] Acquire at least one subsequent operation action of the bridge crane within a preset time range according to the historical data, and acquire at least one target operation action from the at least one subsequent operation action;

[0050] The real-time profile is adjusted according to the target operation action to generate a predicted profile at a corresponding time point for each target operation action;

[0051] A predicted inclination angle and a predicted offset distance of the rotor relative to a central axis of the stator are generated according to the predicted profile, and a minimum predicted distance between the rotor and the stator is calculated.

[0052] The above embodiments can not only monitor the gap during the rotor lifting process, but also calculate and predict the current minimum distance between the rotor and the stator based on the monitoring results, and timely issue an early warning or adjust the rotor center to ensure that it is aligned with the stator center. This not only enhances the accuracy of the judgment, but also reduces costs while greatly saving manpower and avoiding personnel operation risks.

[0053] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0054] Figure 3 is a schematic diagram of the structure of the gap monitoring device for the hoisting of the turbine generator rotor provided in Example 2, such as Figure 3 As shown, the gap monitoring device includes a first control module 100, a second control module 200 and a third control module 300.

[0055] The first control module 100 is used to move the rotor to the top of the stator pit, control the rotor to descend, so that the vertical distance between the bottom of the rotor and the top of the stator is less than a first preset value, and initially align the center of the rotor with the center of the stator;

[0056] The second control module 200 is used to continue to slowly drop the hook after the rotor is stable, collect the first distance between the stator and the rotor, and stop dropping the hook when any of the first distances is less than a second preset value, and adjust the rotor center to align the rotor center and the stator center for a second time, and then continue to drop the hook until the rotor drops to a preset calibration position of the stator;

[0057] The third control module 300 is used to continue to slowly drop the hook, and simultaneously collect the first distance and the second distance between the stator and the rotor, calculate the minimum real-time distance between the rotor and the stator according to the first distance and the second distance, and when the minimum real-time distance is less than a third preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned, and then continue to drop the hook, and repeat this step until the rotor falls onto the frame brake in the stator pit.

[0058] In a preferred embodiment, the inner wall of the stator is provided with at least 6 evenly distributed gap sensors, and the vertical distance between each gap sensor and the top of the stator is equal; the outer wall of the rotor of the hydro-generator is provided with at least 4 evenly distributed first infrared ranging sensors, and the vertical distance between each first infrared ranging sensor and the bottom of the rotor is the same.

[0059] In a preferred embodiment, the first control module 100 specifically includes:

[0060] A moving unit, used for moving the rotor to the top of the stator pit through two bridge cranes;

[0061] a first acquisition unit, configured to continuously acquire a real-time distance between the rotor and the ground through the first infrared ranging sensor;

[0062] a first calculation unit, configured to obtain a stator height and an installation position of the first infrared ranging sensor on an outer wall of the rotor, and calculate a real-time vertical distance between a bottom of the rotor and a top of the stator according to the real-time distance;

[0063] The first adjustment unit is used to stop the hook from dropping when the real-time vertical distance is less than a first preset value, and to adjust the inclination angle of the rotor and the position of the rotor center in the horizontal direction so that the rotor and the stator center are preliminarily aligned.

[0064] In a preferred embodiment, the second control module 200 specifically includes:

[0065] a first acquisition unit, configured to acquire a preset calibration position of the stator, a stator height, and an installation position of the first infrared ranging sensor on an outer wall of the rotor, and calculate a target height between the rotor and the ground;

[0066] A second acquisition unit is used to continuously acquire a first distance between an inner wall of the stator and an outer wall of the rotor at a corresponding point through the gap sensor, and simultaneously continuously acquire a real-time distance between the rotor and the ground through the first infrared ranging sensor;

[0067] The second adjustment unit is used to determine whether each first distance is less than a second preset value. When any first distance is less than the second preset value, the hook is stopped, and the inclination angle of the rotor is adjusted according to the real-time distances collected by all the first infrared ranging sensors at the current moment, and the position of the rotor center in the horizontal direction is adjusted according to the first distances collected by all the gap sensors at the current moment, until the real-time distance between the rotor and the ground is less than the target height.

[0068] In a preferred embodiment, the third control module 300 specifically includes:

[0069] A third acquisition unit, configured to continuously acquire a first distance between the inner wall of the stator and the outer wall of the rotor at a corresponding point through the gap sensor and to continuously acquire a second distance between the inner wall of the stator and the outer wall of the rotor at a corresponding point through the second infrared ranging sensor at the same time;

[0070] A first judging unit is used to judge whether any of the first distances is less than a second preset value or whether any of the second distances is less than a third preset value, and if so, stop the hook drop and drive the third adjusting unit; if not, drive the second calculating unit;

[0071] a second calculation unit, configured to simulate a real-time profile of the rotor in the stator according to all first distances, all second distances, the installation position of the gap sensor, and the installation position of the second infrared ranging sensor, generate an inclination angle and an offset distance of the rotor relative to a central axis of the stator according to the real-time profile, and calculate a minimum real-time distance between the rotor and the stator according to the inclination angle and the offset distance, and stop the hook drop if the minimum real-time distance is less than a third preset value, and drive a third adjustment unit;

[0072] The third adjustment unit is used to adjust the rotor center according to the tilt angle and the offset distance so that the rotor center and the stator center are aligned.

[0073] In a preferred embodiment, it also includes a prediction module 400, which is used to generate a minimum predicted distance between the outer wall of the rotor and the inner wall of the stator corresponding to a preset time point based on the first distance, the second distance and subsequent operation actions of the bridge crane. When the minimum predicted distance is less than a third preset value, the hook is stopped and the rotor center is adjusted.

[0074] In a preferred embodiment, the prediction module 400 specifically includes:

[0075] a simulation unit, configured to simulate a real-time profile of the rotor within the stator according to the first distance, the second distance, an installation position of the gap sensor, and an installation position of the second infrared ranging sensor;

[0076] A second acquisition unit is used to acquire at least one subsequent operation action of the bridge crane within a preset time range according to the historical data, and acquire at least one target operation action from the at least one subsequent operation action;

[0077] A profile updating unit, configured to adjust the real-time profile according to the target operation action, and generate a predicted profile corresponding to a time point of each target operation action;

[0078] The third calculation unit is used to generate a predicted inclination angle and a predicted offset distance of the rotor relative to the central axis of the stator according to the predicted profile, and calculate a minimum predicted distance between the rotor and the stator.

[0079] The above-mentioned embodiment provides a gap monitoring device for the rotor hoisting of a hydro-turbine generator, which can not only monitor the gap during the rotor hoisting process, but also calculate and predict the current minimum distance between the rotor and the stator based on the monitoring results, which not only enhances the judgment accuracy, but also reduces the cost while greatly saving manpower and avoiding the risk of personnel operation.

[0080] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] Those of ordinary skill in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0082] In the embodiments provided by the present invention, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0083] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0084] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0085] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A method for monitoring the clearance of a hydro-generator rotor hoisting, characterized in that: The outer wall of the rotor of the hydro-generator is provided with at least one first infrared distance measuring sensor, and the first infrared distance measuring sensor is used to measure a first vertical distance between the rotor and the ground; A plurality of gap sensors are provided on the upper part of the stator of the hydro-turbine generator and along the inner wall of the stator, and a second infrared distance measuring sensor is equidistantly provided below each of the gap sensors, the gap sensor is used to measure a first distance between the stator and the rotor, and the second infrared distance measuring sensor is used to measure a second distance between the stator and the rotor; The gap monitoring method comprises the following steps: Step 1, move the rotor to the top of the stator pit, control the rotor to descend, so that the vertical distance between the bottom of the rotor and the top of the stator is less than a first preset value, and make the center of the rotor and the center of the stator preliminarily aligned; Step 2, after the rotor is stable, continue to slowly drop the hook, collect the first distance between the stator and the rotor, and when any of the first distances is less than a second preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned twice, and then continue to drop the hook until the rotor drops to the preset calibration position of the stator; Step 3, continue to slowly drop the hook, and simultaneously collect the first distance and the second distance between the stator and the rotor, calculate the minimum real-time distance between the rotor and the stator according to the first distance and the second distance, and when the minimum real-time distance is less than a third preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned, and then continue to drop the hook, and repeat this step until the rotor falls onto the frame brake in the stator pit; The method also includes a prediction step, specifically: generating a minimum predicted distance between the outer wall of the rotor and the inner wall of the stator corresponding to a preset time point based on the first distance, the second distance and subsequent operation actions of the bridge crane; when the minimum predicted distance is less than a third preset value, stopping the hook and adjusting the rotor center.

2. The gap monitoring method for the hoisting of the hydro-generator rotor according to claim 1 is characterized in that: The inner wall of the stator is provided with at least 6 evenly distributed gap sensors, and the vertical distance between each gap sensor and the top of the stator is equal; The outer wall of the rotor of the hydro-generator is provided with at least four evenly distributed first infrared ranging sensors, and the vertical distance between each first infrared ranging sensor and the bottom of the rotor is the same.

3. The gap monitoring method for the rotor hoisting of a hydro-generator according to claim 2 is characterized in that: The step 1 specifically comprises the following steps: The rotor is moved to the position directly above the stator pit by two bridge cranes; Continuously collecting the real-time distance between the rotor and the ground by using the first infrared ranging sensor; Acquire the stator height and the installation position of the first infrared ranging sensor on the outer wall of the rotor, and calculate the real-time vertical distance between the bottom of the rotor and the top of the stator according to the real-time distance; When the real-time vertical distance is less than the first preset value, the hook is stopped, and the inclination angle of the rotor and the position of the rotor center in the horizontal direction are adjusted to preliminarily align the rotor center with the stator center.

4. The gap monitoring method for the rotor hoisting of a hydro-generator according to claim 2 is characterized in that: The step 2 specifically includes the following steps: Obtaining a preset calibration position of the stator, a stator height, and an installation position of the first infrared ranging sensor on the outer wall of the rotor, and calculating a target height between the rotor and the ground; The first distance between the inner wall of the stator and the outer wall of the rotor at the corresponding point is continuously collected by the gap sensor, and the real-time distance between the rotor and the ground is continuously collected by the first infrared distance measuring sensor; Determine whether each first distance is less than a second preset value, and when any first distance is less than the second preset value, stop the hook drop, and adjust the inclination angle of the rotor according to the real-time distances collected by all the first infrared ranging sensors at the current moment, and adjust the position of the rotor center in the horizontal direction according to the first distances collected by all the gap sensors at the current moment; The above steps are repeated until the real-time distance between the rotor and the ground is less than the target height.

5. The gap monitoring method for the hoisting of the hydro-generator rotor according to claim 2 is characterized in that: The step 3 specifically comprises the following steps: S301, continuously collecting a first distance between a corresponding point on the inner wall of the stator and an outer wall of the rotor by means of the gap sensor, and continuously collecting a second distance between a corresponding point on the inner wall of the stator and an outer wall of the rotor by means of the second infrared ranging sensor at the same time; S302, determining whether any of the first distances is less than a second preset value or whether any of the second distances is less than a third preset value, if so, stopping the hook drop and executing S304; if not, executing S303; S303, simulating the real-time profile of the rotor in the stator according to all the first distances, all the second distances, the installation position of the gap sensor, and the installation position of the second infrared ranging sensor, generating the inclination angle and the offset distance of the rotor relative to the central axis of the stator according to the real-time profile, and calculating the minimum real-time distance between the rotor and the stator according to the inclination angle and the offset distance, if the minimum real-time distance is less than a third preset value, stopping the hook drop, and executing S304; S304: Adjust the center of the rotor according to the tilt angle and the offset distance so that the center of the rotor and the center of the stator are aligned.

6. The gap monitoring method for the hoisting of the rotor of a hydro-generator according to any one of claims 1 to 5, characterized in that: The minimum predicted distance between the outer wall of the rotor and the inner wall of the stator corresponding to a preset time point is generated according to the first distance, the second distance and the subsequent operation of the bridge crane, specifically: Simulating a real-time profile of the rotor in the stator according to the first distance, the second distance, the installation position of the gap sensor, and the installation position of the second infrared ranging sensor; Acquire at least one subsequent operation action of the bridge crane within a preset time range according to the historical data, and acquire at least one target operation action from the at least one subsequent operation action; The real-time profile is adjusted according to the target operation action to generate a predicted profile at a corresponding time point for each target operation action; A predicted inclination angle and a predicted offset distance of the rotor relative to a central axis of the stator are generated according to the predicted profile, and a minimum predicted distance between the rotor and the stator is calculated.

7. A clearance monitoring device for hoisting a hydro-generator rotor, characterized in that: A first infrared distance measuring sensor is provided on the outer wall of the rotor of the hydro-generator, and the first infrared distance measuring sensor is used to measure a first vertical distance between the rotor and the ground; A plurality of gap sensors are provided on the upper part of the stator of the hydro-turbine generator and along the inner wall of the stator, and a second infrared distance measuring sensor is equidistantly provided below each of the gap sensors, the gap sensor is used to measure a first distance between the stator and the rotor, and the second infrared distance measuring sensor is used to measure a second distance between the stator and the rotor; The gap monitoring device includes a first control module, a second control module, a third control module and a prediction module. The first control module is used to move the rotor to the top of the stator pit, control the rotor to descend, so that the vertical distance between the bottom of the rotor and the top of the stator is less than a first preset value, and initially align the center of the rotor with the center of the stator; The second control module is used to continue to slowly drop the hook after the rotor is stable, collect the first distance between the stator and the rotor, stop dropping the hook when any of the first distances is less than a second preset value, adjust the rotor center so that the rotor center and the stator center are aligned again, and then continue to drop the hook until the rotor drops to a preset calibration position of the stator; The third control module is used to continue to slowly drop the hook, and at the same time collect the first distance and the second distance between the stator and the rotor, calculate the minimum real-time distance between the rotor and the stator according to the first distance and the second distance, and when the minimum real-time distance is less than a third preset value, stop dropping the hook, adjust the rotor center so that the rotor center and the stator center are aligned, and then continue to drop the hook, and repeat this step until the rotor falls onto the frame brake in the stator pit; The prediction module is used to generate a minimum predicted distance between the outer wall of the rotor and the inner wall of the stator corresponding to a preset time point based on the first distance, the second distance and subsequent operation actions of the bridge crane. When the minimum predicted distance is less than a third preset value, the hook is stopped and the rotor center is adjusted.

8. The gap monitoring device for the hoisting of the hydro-generator rotor according to claim 7 is characterized in that: The inner wall of the stator is provided with at least 6 evenly distributed gap sensors, and the vertical distance between each gap sensor and the top of the stator is equal; the outer wall of the rotor of the hydro-generator is provided with at least 4 evenly distributed first infrared ranging sensors, and the vertical distance between each first infrared ranging sensor and the bottom of the rotor is the same.

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