Fan unit main shaft displacement monitoring device and working method thereof

Abstract

The invention discloses a fan unit main shaft displacement monitoring device and a working method thereof, and belongs to the technical field of concrete pole pre-embedded foundation structures. The device comprises a main shaft mounting bottom plate, a mounting table, a fan main shaft and a bearing seat assembly. A displacement monitoring sensor assembly is arranged between the bearing seat assemblies at the front end and the rear end and comprises three sets of laser correlation sensors arranged on the periphery of the draught fan main shaft, and the three sets of laser correlation sensors are located in different directions. The distance between the correlation laser straight line of each laser correlation sensor and the central axis of the fan main shaft is r + alpha + beta; the displacement change of the main shaft of the wind turbine can be monitored in real time, when the main shaft of the wind turbine deviates in the radial direction, the monitoring system can accurately judge the displacement state under the condition that the roundness error of the main shaft is eliminated, the displacement condition of the main shaft of the wind turbine can be more timely and accurately detected, and stable operation of the wind turbine is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine main shaft detection, and in particular to a wind turbine main shaft displacement monitoring device and a working method thereof. Background Art

[0002] The main shaft of a wind turbine is a key core component in the nacelle of a wind turbine. It is mainly used to connect the impeller hub and the gearbox, and undertakes the functions of transmission and force. In a wind turbine, the main shaft is the rotating shaft of the wind wheel. It supports the wind wheel and transmits the torque of the wind wheel to the gearbox, while transmitting the axial thrust and aerodynamic bending moment to the base. The function of the main shaft is to ensure that the wind turbine can efficiently convert wind energy into electrical energy and ensure the stable operation of the entire system. The service life of the main shaft is twenty to thirty years. During this period, the main shaft may wear and displace, causing the wind turbine to vibrate, so it is necessary to design a monitoring device to monitor the main shaft status in real time.

[0003] The displacement monitoring of the wind turbine main shaft is divided into axial displacement and radial displacement. Regarding axial displacement monitoring, relevant disclosed technologies have been used in this technical field. For example, Chinese patent CN221503442U discloses a wind turbine main shaft displacement detection device. However, this type of monitoring device technology mainly detects the axial displacement of the wind turbine main shaft. If the wind turbine main shaft has a radial loose fault, this type of monitoring device cannot detect the fault in a timely and accurate manner.

[0004] Based on this, the present invention designs a fan unit main shaft displacement monitoring device and a working method thereof to solve the above problems. Summary of the Invention

[0005] The purpose of the invention is to provide a fan unit main shaft displacement monitoring device and a working method thereof to solve the above technical problems.

[0006] To achieve the above objectives, the invention provides the following technical solutions:

[0007] A fan unit main shaft displacement monitoring device includes a main shaft mounting base plate, two mounting platforms spaced apart from each other are fixedly provided on the front end of the top of the main shaft mounting base plate, a fan main shaft is provided between the mounting platforms on both sides, and the front and rear ends of the fan main shaft are rotatably mounted on the mounting platforms on both sides through bearing seat assemblies respectively;

[0008] A displacement monitoring sensor assembly is arranged between the bearing seat assemblies at the front and rear ends. The displacement monitoring sensor assembly includes three groups of laser beam sensors arranged on the periphery of the fan main shaft. The three groups of laser beam sensors are located in different positions. The distance between the beam laser straight line of each laser beam sensor and the central axis of the fan main shaft is r+α+β; wherein r is the ideal radius value of the fan main shaft, α is the maximum radius error value of the fan main shaft, and β is the installation clearance value of the beam laser straight line.

[0009] As a preferred solution, the bearing seat assembly includes an annular mounting seat, the two ends of which extend outward to form side wing plates, the side wing plates are mounted on the mounting platform and fixed by bolts, the annular mounting seat is embedded with a double-row tapered roller bearing, the fan main shaft is rotatably mounted on the annular mounting seat through the double-row tapered roller bearing, and bearing limit plates are provided at the front and rear of the annular mounting seat.

[0010] As a preferred solution, the displacement monitoring sensor assembly includes a triangular mounting frame, and the three groups of laser beam sensors are respectively installed on the three sides of the triangular mounting frame. The triangular mounting frame includes an upper frame body and a lower frame body, and the ends of the upper frame body and the lower frame body extend outward to form mounting wings, and the mounting wings are fixed to the mounting platform by bolts.

[0011] As a preferred solution, the laser beam sensor includes a transmitting end and a receiving end, which are respectively installed at the two ends of a U-shaped bracket, and the transmitting end and the receiving end are located on the same straight line. The U-shaped bracket is installed on the triangular mounting frame through a spacing adjustment mechanism, and the spacing adjustment mechanism can adjust the spacing between the beam laser straight line and the fan main shaft.

[0012] As a preferred solution, the spacing adjustment mechanism includes an adjusting screw connected to the outside of the U-shaped bracket and two limiting slide rods. The adjusting screw passes through the side frame of the triangular mounting frame and is threaded with a double nut. The outer wall of the adjusting screw is located between the U-shaped bracket and the side frame of the triangular mounting frame and is abutted with a supporting compression spring. Two bushings are fixedly embedded in the side frame of the triangular mounting frame, and the two limiting slide rods slide through the two bushings respectively.

[0013] As a preferred solution, the circumferential azimuth angle of the three groups of laser beam sensors is 120°.

[0014] As a preferred solution, the laser beam lines of the three groups of laser beam sensors are located in the same plane.

[0015] As a preferred solution, the value range of β is 0.2mm≤β≤0.5mm.

[0016] As a preferred solution, the three groups of laser beam sensors are respectively connected to the terminal board of the data acquisition board, and the data acquisition board is connected to the industrial computer through the PCI slot.

[0017] A working method of a fan unit main shaft displacement monitoring device is provided, wherein three groups of laser beam sensors in different orientations are arranged on the circumferential outer side of the fan main shaft, and the beam laser straight line of each group of laser beam sensors is installed with a small gap between it and the actual rotation trajectory circle of the fan main shaft; when the fan main shaft rotates normally, each of the laser beam sensors is not blocked, and the monitoring system displays that the fan main shaft is in normal state; when the fan main shaft has a radial offset, and the offset value is greater than or equal to the gap between the beam laser straight line and the actual rotation trajectory circle of the fan main shaft, the three groups of laser beam sensors respectively send monitoring signals, which are sent to an industrial computer through signal transmission, and an abnormal alarm is issued.

[0018] Compared with the prior art, the invention has the following beneficial effects:

[0019] The wind turbine unit main shaft displacement monitoring device and its working method of the present invention are configured to provide three groups of laser beam sensors in different orientations on the circumferential outer side of the wind turbine main shaft, and each group of laser beam sensors is installed with a small gap between the beam laser line and the actual rotation trajectory circle of the wind turbine main shaft; the displacement changes of the wind turbine main shaft can be monitored in real time. When the wind turbine main shaft has radial offset, the monitoring system can accurately judge the displacement state while eliminating the main shaft roundness error, and can detect the displacement condition of the wind turbine main shaft more timely and accurately, thereby ensuring the stable operation of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0023] Figure 3 This is a structural diagram of the bearing seat assembly of the present invention;

[0024] Figure 4 This is a schematic structural diagram of the displacement monitoring sensor assembly of the present invention;

[0025] Figure 5This is a schematic diagram of the structure of the connection module of the displacement monitoring sensor assembly of the present invention;

[0026] Figure 6 This is a schematic diagram of the monitoring principle of the displacement monitoring sensor assembly of the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] Example 1

[0029] See also Figure 1-2 , the invention provides a technical solution:

[0030] A fan unit main shaft displacement monitoring device includes a main shaft mounting base plate 10, two mounting platforms 20 spaced apart and fixedly provided on the front end of the top of the main shaft mounting base plate 10, a fan main shaft 30 is provided between the mounting platforms 20 on both sides, and the front and rear ends of the fan main shaft 30 are rotatably mounted on the mounting platforms 20 on both sides through bearing seat assemblies 40;

[0031] Among them, such as Figure 3 As shown, the bearing seat assembly 40 includes an annular mounting seat 41, and both ends of the annular mounting seat 41 extend outward to form side wing plates 42. The side wing plates 42 are mounted on the mounting platform 20 and fixed by bolts. A double-row tapered roller bearing 43 is embedded in the annular mounting seat 41. The fan main shaft 30 is rotatably mounted on the annular mounting seat 41 through the double-row tapered roller bearing 43. Bearing limit plates 44 are set in front and behind the annular mounting seat 41.

[0032] When a wear gap occurs between the fan main shaft 30 and the bearing seat assembly 40, vibrations of varying degrees are likely to occur, posing a safety hazard. In the prior art, radial displacement monitoring of rotating shaft parts generally uses a non-contact eddy current sensor. The sensor is fixedly installed beside the shaft part and can detect the distance from the shaft side wall. When the shaft undergoes radial displacement, the monitoring distance of the eddy current sensor also changes, thereby determining the occurrence of displacement. In actual applications, although this monitoring solution is simple and direct, it has certain limitations and technical drawbacks. For example, This monitoring solution is generally used for small shaft parts, because small shaft parts are easy to process and control the roundness accuracy of the non-installation parts of the shaft outer wall, thereby effectively controlling the interference of the shaft outer wall roundness error on the displacement monitoring signal. When this monitoring solution is applied to the fan main shaft, due to the large size of the fan main shaft, the equipment is generally only precision-machined at the bearing installation position when it leaves the factory. Other parts of the shaft outer wall are prone to varying degrees of roundness error. The larger the shaft diameter, the more obvious the error. Therefore, installing an eddy current sensor can determine the position change of the fan main shaft, but it is difficult to accurately determine whether the change is caused by the displacement change.

[0033] like Figure 4 As shown, in order to overcome this technical defect, in the present technical solution, a displacement monitoring sensor assembly 50 is arranged between the front and rear end bearing seat assemblies 40, and the displacement monitoring sensor assembly 50 includes three groups of laser beam sensors 51 arranged on the periphery of the fan main shaft 30, and the three groups of laser beam sensors 51 are located in different orientations. The circumferential orientation angle of the three groups of laser beam sensors 51 is 120°, and the beam laser straight lines of the three groups of laser beam sensors 51 are located in the same plane. The distance between the beam laser straight line of each laser beam sensor 51 and the central axis of the fan main shaft 30 is r+α+β; wherein r is the ideal radius value of the fan main shaft 30, α is the maximum radius error value of the fan main shaft 30, and β is the installation clearance value of the beam laser straight line; the value of β in this embodiment ranges from 0.2mm≤β≤0.5mm.

[0034] Specific, combined Figure 6As shown, a is the ideal cross-sectional outer circumference of the fan main shaft 30. However, since the fan main shaft 30 is large in size and there is no requirement for installation accuracy, there is a certain roundness error in the non-installation connection parts of the outer wall of the fan main shaft 30 when the fan main shaft 30 leaves the factory. b is the actual cross-sectional outer circumference of the fan main shaft 30. When the fan main shaft 30 rotates, the maximum trajectory circle generated by trajectory b is c. That is to say, when the distance between the laser straight line of the laser beam sensor 51 and the central axis of the fan main shaft 30 is less than or equal to the radius of the trajectory circle c, the laser will be blocked and an alarm will be triggered. Therefore, the distance between the laser straight line of each of the aforementioned laser beam sensors 51 and the central axis of the fan main shaft 30 is r+α+β, where β is the gap between the laser straight line and the trajectory circle c. When the fan main shaft 30 undergoes radial vibration displacement, the actual maximum trajectory circle of the movement will be greater than the trajectory circle c. When the range exceeds β, the laser will be blocked and an alarm will be triggered, thereby realizing position monitoring.

[0035] The purpose of evenly arranging three groups of laser beam sensors 51 is, on the one hand, to eliminate accidental factors of single sensor failure. For example, if the monitoring system shows that two of the sensors are monitoring displacement and the other sensor is monitoring normally, the sensor itself may be faulty. On the other hand, if the system is connected to an external displacement emergency stop measure, the displacement result can be quickly judged within 120° rotation of the fan main shaft 30, and the emergency stop measure can be quickly implemented to avoid faulty operation to the greatest extent.

[0036] One of the technical guarantees for the effective operation of this solution is that the laser beam sensor 51 can be accurately installed and the β value can be controlled. Therefore, the laser beam sensor 51 includes a transmitting end 511 and a receiving end 512. The transmitting end 511 and the receiving end 512 are respectively installed at the two ends of a U-shaped bracket 53. The transmitting end 511 and the receiving end 512 are located on the same straight line. The U-shaped bracket 53 is installed on the triangular mounting frame 52 through a spacing adjustment mechanism 54. The spacing adjustment mechanism 54 can adjust the spacing between the laser beam line and the fan main shaft 30. Specifically, the spacing adjustment mechanism 54 includes an adjusting screw 541 connected to the outside of the U-shaped bracket 53 and two limit slides 542. The adjusting screw 541 penetrates After passing through the side frame of the triangular mounting frame 52, a double nut 543 is screwed on it. The outer wall of the adjusting screw 541 is located between the U-shaped bracket 53 and the side frame of the triangular mounting frame 52, and a supporting compression spring 544 is provided to abut against it. Two bushings 545 are fixedly embedded in the side frame of the triangular mounting frame 52, and two limiting slide rods 542 are slidably passed through the two bushings 545 respectively; when actually installing and debugging the spacing, the outer positioning nut of the double nut 543 can be loosened first, and then the inner adjusting nut can be slowly screwed. With the elastic force of the supporting compression spring 544, the adjusting screw 541 is driven to perform slight advance and retreat adjustments until the β value falls between 0.2mm≤β≤0.5mm, and then the outer positioning nut can be tightened.

[0037] like Figure 5 As shown, the three groups of laser beam sensors 51 are respectively connected to the terminal board 70 of the data acquisition board 60, and the data acquisition board 70 is connected to the industrial computer 80 through the PCI slot; the laser beam sensors 51 feedback monitoring information in the form of electrical signals, and the monitoring data is stored, calculated and analyzed in real time in the industrial computer 80. When the wind turbine main shaft 30 has radial deviation, an alarm is promptly issued in the monitoring system to ensure the stable operation of the wind turbine.

[0038] Example 2

[0039] Based on Example 1, this embodiment provides a working method of a fan unit main shaft displacement monitoring device, by arranging three groups of laser beam sensors 51 in different orientations on the outer side of the circumference of the fan main shaft 30, and each group of laser beam sensors 51 is installed with a small gap between the beam laser straight line and the actual rotation trajectory circle of the fan main shaft 30; when the fan main shaft 30 rotates normally, each laser beam sensor 51 is not blocked, and the monitoring system displays that the fan main shaft 30 is in normal status; when the fan main shaft 30 has a radial offset, and the offset value is greater than or equal to the gap between the beam laser straight line and the actual rotation trajectory circle of the fan main shaft 30, the three groups of laser beam sensors 51 respectively send monitoring signals, and send them to the industrial computer 80 through signal transmission, and issue an abnormal alarm.

[0040] In the description of the invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0041] In the invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation", "screw-on" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the invention according to the specific circumstances.

[0042] While embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and alterations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fan unit main shaft displacement monitoring device, comprising a main shaft mounting base plate (10), wherein two mounting platforms (20) are fixedly provided on the front end of the top of the main shaft mounting base plate (10) and are spaced apart from each other. A fan main shaft (30) is provided between the mounting platforms (20) on both sides. The front and rear ends of the fan main shaft (30) are rotatably mounted on the mounting platforms (20) on both sides respectively through bearing seat assemblies (40); and characterized in that: A displacement monitoring sensor assembly (50) is provided between the bearing seat assemblies (40) at the front and rear ends. The displacement monitoring sensor assembly (50) includes three groups of laser beam sensors (51) provided on the periphery of the fan main shaft (30). The three groups of laser beam sensors (51) are located in different positions. The distance between the beam laser straight line of each laser beam sensor (51) and the central axis of the fan main shaft (30) is r+α+β; wherein r is the ideal radius value of the fan main shaft (30), α is the maximum radius error value of the fan main shaft (30), and β is the installation clearance value of the beam laser straight line.

2. A fan unit main shaft displacement monitoring device according to claim 1, characterized in that: The bearing seat assembly (40) includes an annular mounting seat (41), both ends of the annular mounting seat (41) extend outward to form side wing plates (42), the side wing plates (42) are mounted on the mounting platform (20) and fixed by bolts, a double-row tapered roller bearing (43) is embedded in the annular mounting seat (41), the fan main shaft (30) is rotatably mounted on the annular mounting seat (41) through the double-row tapered roller bearing (43), and bearing limit plates (44) are provided at the front and rear of the annular mounting seat (41).

3. The fan unit main shaft displacement monitoring device according to claim 1, characterized in that: The displacement monitoring sensor assembly (50) includes a triangular mounting frame (52), and three groups of laser beam sensors (51) are respectively mounted on three sides of the triangular mounting frame (52). The triangular mounting frame (52) includes an upper frame body (521) and a lower frame body (531). Both ends of the upper frame body (521) and the lower frame body (531) extend outward to form mounting wings (523). The mounting wings (523) are fixed to the mounting platform (20) by bolts.

4. The fan unit main shaft displacement monitoring device according to claim 3, characterized in that: The laser beam sensor (51) comprises a transmitting end (511) and a receiving end (512), wherein the transmitting end (511) and the receiving end (512) are respectively mounted on two ends of a U-shaped bracket (53), wherein the transmitting end (511) and the receiving end (512) are located on the same straight line, and the U-shaped bracket (53) is mounted on the triangular mounting frame (52) via a spacing adjustment mechanism (54), wherein the spacing adjustment mechanism (54) is capable of adjusting the spacing between the beam laser line and the fan main shaft (30).

5. The fan unit main shaft displacement monitoring device according to claim 4, characterized in that: The spacing adjustment mechanism (54) includes an adjusting screw (541) connected to the outside of the U-shaped bracket (53) and two limiting slide bars (542). The adjusting screw (541) passes through the side frame of the triangular mounting frame (52) and is screwed with a double nut (543). The outer wall of the adjusting screw (541) is located between the U-shaped bracket (53) and the side frame of the triangular mounting frame (52) and is provided with a supporting compression spring (544). Two bushings (545) are fixedly embedded in the side frame of the triangular mounting frame (52), and the two limiting slide bars (542) are respectively slidably inserted into the two bushings (545).

6. The fan unit main shaft displacement monitoring device according to claim 1, characterized in that: The circumferential azimuth angle of the three groups of laser beam sensors (51) is 120°.

7. The fan unit main shaft displacement monitoring device according to claim 1, characterized in that: The laser beam lines of the three groups of laser beam sensors (51) are located in the same plane.

8. The fan unit main shaft displacement monitoring device according to claim 1, characterized in that: The value range of β is 0.2mm≤β≤0.5mm.

9. The fan unit main shaft displacement monitoring device according to claim 1, characterized in that: The three groups of laser beam sensors (51) are respectively connected to the terminal board (70) of the data acquisition board (60), and the data acquisition board (70) is connected to the industrial computer (80) through the PCI slot.

10. The operating method of the fan unit main shaft displacement monitoring device according to any one of claims 1 to 9, characterized in that: Three groups of laser beam sensors (51) with different orientations are arranged on the outer side of the circumference of the fan main shaft (30), and each group of the laser beam sensors (51) is installed with a small gap between the beam laser line and the actual rotation trajectory circle of the fan main shaft (30); when the fan main shaft (30) rotates normally, each of the laser beam sensors (51) is not blocked, and the monitoring system displays that the fan main shaft (30) is in a normal state; when the fan main shaft (30) has a radial offset, and the offset value is greater than or equal to the gap between the beam laser line and the actual rotation trajectory circle of the fan main shaft (30), the three groups of laser beam sensors (51) respectively send monitoring signals, and send them to the industrial computer (80) through signal transmission, and issue an abnormal alarm.

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