阅读说明：本技术 一种风电塔筒形建筑物的倾斜形变检测方法 (Method for detecting inclined deformation of wind power tower drum-shaped building ) 是由 张晋源 高赫 高峰山 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种测量风电塔筒倾斜形变的检测方法。包括检测杆,可开口可闭口的检测环,涡流传感器。通过检测环内部的涡流传感器测量风电塔筒位移量而计算出风电塔筒的倾斜角度。目前,很多测量方式都是在风电塔筒塔身上安装测量系统,在风电塔筒产生倾斜的同时,测量仪器也跟着发生倾斜,严重的影响测量精度。本发明基于以上问题提出了一种独立于风电塔筒的测量方式,具有测量不受塔身倾斜影响的优点,能够更精确的实时监测塔筒倾斜状况并能够提前预警倒塔事故。(The invention discloses a detection method for measuring the inclined deformation of a wind power tower. Comprises a detection rod, a detection ring with an openable and closable opening and an eddy current sensor. The inclination angle of the wind power tower is calculated by measuring the displacement of the wind power tower through the eddy current sensor in the detection ring. At present, many measurement methods are all installing measurement system on wind power tower body, and when wind power tower barrel produced the slope, the measuring instrument also followed the slope, serious influence measurement accuracy. The invention provides a measuring mode independent of the wind power tower drum based on the problems, has the advantage that the measurement is not influenced by the inclination of the tower body, can more accurately monitor the inclination condition of the tower drum in real time and can early warn the tower collapse accident.)

1. The method for detecting the inclined deformation of the wind power tower drum-shaped building comprises a detection rod and a detection ring (a plurality of eddy current sensors are uniformly distributed on the inner wall of the detection ring) with an opening capable of being closed, the measuring point is any height, and the inclination of the wind power tower drum is calculated by measuring the displacement generated by the inclination of the wind power tower drum.

2. The mast of claim 1, independent of the wind tower, perpendicular to the wind tower cross section.

3. The detection ring as claimed in claim 1, wherein the detection ring is fixed on the detection rod and is sleeved outside the wind power tower, the cross section of the detection ring is parallel to that of the wind power tower, and a plurality of eddy current sensors are uniformly distributed on the inner wall of the detection ring and are used for detecting the displacement of the wind power tower.

4. A measuring point according to claim 1, characterized in that the position of the detection ring on the detection bar is adjustable, and the corresponding measuring point is correspondingly unrestricted.

5. The method for calculating the inclination of a wind tower according to claim 1, wherein the inclination displacement Δ d of the wind tower in the horizontal plane of the detection ring is measured by an eddy current sensor on the inner wall of the detection ring, and the height of the detection ring fixed on the detection bar is H, so that the detection ring has an inclination angle due to the vertical relationship between the horizontal plane of the detection ring and the detection bar

6. The above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto, and modifications may be made to the technical solutions described above, or equivalent substitutions may be made to some or all of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Technical Field

The invention relates to an external inclined deformation detection method for a wind power tower.

Background

The wind power generator is influenced by factors such as wind power, vibration and the like during operation, and the wind power tower barrel is easy to incline. If the inclination angle is too large, the normal operation of the wind driven generator is directly damaged, and a tower collapse accident can be caused in severe cases, so that huge economic loss is caused. Therefore, the method has great value for the real-time and accurate inclination monitoring of the wind power tower.

The method disclosed at present is that a measuring device is installed on a wind power tower barrel tower, and when the tower barrel inclines, the measuring device also inclines along with a tower body to generate a measuring error, so that the measuring accuracy is influenced. The invention provides an inclination measuring method independent of a wind power tower barrel based on the problems, which can accurately detect the inclination of the tower barrel in real time and can early warn.

Disclosure of Invention

The invention aims to overcome the defects and provides an external inclined deformation detection method facing a wind power tower.

In order to achieve the purpose, the invention adopts the following specific scheme: an external inclined deformation detection method for a wind power tower cylinder is characterized in that as shown in fig. 1, a detection ring 3 is arranged on the periphery of the wind power tower cylinder 1, and the detection ring 3 is installed on the outer side of the wind power tower cylinder 1 through a detection rod 2. The tower barrel 1 and the detection ring 3 are separated by a gap and cannot be contacted. The mounting position of the detection ring 3 on the detection rod 2 can be adjusted up and down.

The detection ring 3 is formed by connecting two insulating double semi-rings, and the opening of the detection ring can be closed. As shown in fig. 2 and 3, the detection ring is connected by a detection ring rotating shaft 6 and opened and closed by a detection ring holder 5, and four eddy current sensors 4 are uniformly installed on the inner wall in four directions, i.e., up, down, left, and right.

Each eddy current sensor 4 transmits the distance measurement data of the tower drum 1 to a computer information system, the inclination deformation direction and the deformation displacement of the tower drum are calculated according to the displacement change of the tower drum 1 by the eddy current sensors 4 installed at different positions, and the inclination deformation of buildings with similar shapes such as the tower drum 1 at different heights can be detected in real time.

The detection rod 2 is a metal rod with an adjustable upper and lower fixing positions, and a plurality of fixing points are arranged on the metal rod, so that a plurality of detection rings 3 can be simultaneously fixed at different upper and lower positions of the detection rod 2. The inclination deformation trend of the tower barrel is calculated according to the change of the distance from the eddy current sensor 4 to the tower barrel 1 in different directions on the inner wall of the detection ring 3, and the early warning effect is achieved.

The installation mode of the invention is not limited to specific positions outside the tower, and the invention also belongs to the scheme of the invention, for example, the installation mode is independently arranged at one section or multiple sections outside the tower. The number and the mode of the detection rods for fixing the detection ring are not limited, and the scheme of the invention also belongs to the scheme of measuring the inclination of the tower by using a fixed detection ring device independent of the tower.

The invention provides an external real-time inclined deformation detection method for a wind power tower, which uses a circular detection ring 3 as a reference for deformation detection of the wind power tower 1, arranges circular detection ring devices on cross sections with different heights of the tower 1, is provided with a plurality of uniformly distributed eddy current sensors 4 on the detection ring 3, and provides an inclined deformation detection method for the wind power tower by using an eddy current method to measure displacement changes of the detection ring 3 in all directions of the wind power tower.

Drawings

FIG. 1 is a schematic view of an embodiment of the tower inclination detection of the present invention;

FIG. 2 is a schematic view of a detection loop according to an embodiment of the present invention;

FIG. 3 is a schematic view of an embodiment of the present invention showing the opening of the detection ring;

FIG. 4 is a diagram illustrating a mathematical relationship according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a tower inclination calculation principle according to the present invention.

The reference numerals in fig. 1 to 2 illustrate:

1-a wind power tower; 2-a detection rod; 3-detection ring; 4-an eddy current sensor; 5-detecting the ring fixer; 6-detecting the ring rotation axis.

A. B, C, D is composed of four eddy current sensors 4 uniformly arranged in four directions

Detailed Description

The invention will be described in further detail with reference to the following figures and specific examples, without limiting the scope of the invention.

The main solving method of the invention is as follows: the detection ring 3 is fixed on the outer side of the wind power tower barrel 1 by using the detection rod 2 which is independent and vertical to the horizontal plane, and a gap is kept so as not to contact the tower barrel 1. And adjusting the height and the position of the detection ring 3 to enable the detection ring 3 to be parallel to the cross section of the wind power tower cylinder and to be perpendicular to the measuring rod 2. It is proposed that a plurality of detection rings 3 can be arranged at different heights of the tower 1. Four eddy current sensors 4 are uniformly installed in A, B, C, D four directions in the detection ring 3 in an embedded mode, and the sensors vertically face the outer wall of the tower. The displacement Δ d of the tower relative to the detection ring 3 is detected using eddy current displacement measurement.

The eddy current sensor 4 obtains a power supply from the interior of the wind power tower tube 1 through a cable, high-frequency oscillating current in a front-end device in the eddy current sensor 4 flows into a probe coil through the cable, and an alternating magnetic field is generated in the coil in the probe. When the measured tower tube is close to the magnetic field, an eddy current effect is generated on the surface of the tower tube, and simultaneously, the eddy current effect generates an alternating magnetic field with the direction opposite to the direction of the coil inside the eddy current sensor 4. Due to the reaction, the amplitude and the phase of the high-frequency current of the coil are changed, the changed electric signal is subjected to digital-analog conversion operation through an electronic detection device to be converted into a relative displacement variation delta d, and the inclination direction and the inclination angle of the wind power tower can be calculated by utilizing the displacement variations delta d1, delta d2, delta d3 and delta d4 of the wind power tower detected by C, A, B, D four eddy current sensors 4.

As shown in fig. 4, if the tower is tilted in the C direction by an amount Δ d1, the eddy current sensor in the A, C direction measures the following amounts:

Wa＝L+Δd2，Wc＝L-Δd1；

wherein: and L is the initial gap distance between the initial tower barrel 1 and the eddy current sensor 4 on the inner wall of the detection ring 3. Assume that the initial gap distances for the installations are all equal and are L.

Similarly, if the tower is inclined toward the direction D to generate the inclined displacement Δ D3, the displacement measured by the eddy current sensor in the direction B, D is:

Wb＝L+Δd4，Wd＝L-Δd3；

the backstage computer can calculate and judge the direction to which the tower barrel inclines according to the above mathematical formula by receiving the displacement data of the eddy current sensor from the A, B, C and D directions.

Meanwhile, the inclination angle alpha can be calculated by detecting the displacement in different directions received by the ring. The following mathematical relations are provided:

the detection ring is installed and has a ground height H in a coordinate system taking the center of the cross section of the bottom of the tower as a coordinate origin, and the displacement variation delta d detected by the eddy current sensor is detected in the inclined deformation monitoring process.

The invention has the beneficial effects that: the external inclined deformation monitoring method for the wind power tower cylinder comprises the steps that a circular detection ring is used as a reference for deformation detection of the wind power tower cylinder, a plurality of circular detection ring devices can be arranged on cross sections of the tower cylinder at different heights, 4 eddy current sensors which are uniformly distributed are arranged on the inner wall of the detection ring, the fact that the eddy current method is used for measuring displacement change of the detection ring in each direction of the wind power tower cylinder is provided, and the specific inclination is calculated by the aid of a mathematical formula. The method is high in detection precision and good in sensitivity, is not influenced by the inclination of the tower drum, and can detect and early warn the deformation of the wind power tower drum in real time.

The above description is only an exemplary embodiment of the present invention, and all equivalent changes or modifications of the structure, features and principles described in the present patent application are included in the protection scope of the present patent application.