Wind vibration acceleration measuring device for steel pipe member of power transmission tower

Abstract

The invention relates to a power transmission tower steel pipe member wind vibration acceleration measuring device comprising a support fixed with a power transmission tower steel pipe member; the two ends of the elastic piece are hinged to the support, and the natural vibration frequency of the elastic piece is equal to or close to the natural vibration frequency of the steel pipe component; the rack is fixed in the middle of the elastic sheet; the generator is fixed to the support, and the rack is in transmission connection with the input shaft end of the generator; and the acceleration sensor is fixed on the bracket and is electrically connected with the generator. According to the wind vibration acceleration measuring device for the steel pipe member of the power transmission tower, based on the resonance principle, the elastic pieces with equal or similar natural vibration frequency are adopted to take in vibration energy of the steel pipe, collect the vibration energy of the steel pipe and convert the vibration energy into electric energy to supply power to the acceleration sensor, an additional power supply device is not needed, the structure is simple and reliable, and durability is good.

Description

Technical Field

[0001] The present invention belongs to the field of vibration measurement of transmission lines, and particularly relates to a device for measuring the wind-induced vibration acceleration of steel pipe components of a transmission tower. Background Art

[0002] The steel pipe tower of the transmission line is composed of steel pipe members of different specifications. The steel pipe members are prone to vortex-induced vibration in the wind flow, which is also called "gentle breeze vibration" in engineering. Long-term vibration of the steel pipe will cause fatigue cracking of the steel pipe. During the operation and maintenance of the transmission line, it is necessary to monitor the vortex vibration of the steel pipe. The traditional monitoring method is to use an acceleration sensor to collect the vibration data of the steel pipe, and use a battery and a solar panel to supply power to the acceleration sensor. The transmission line is often in a harsh natural environment, and the battery ages and decays quickly. In the case of poor light, the solar panel cannot supply power either. In addition, in actual monitoring, usually only the vibration of the steel pipe is concerned. When the steel pipe is not vibrating, the collected data is invalid. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems that the power supply of the existing acceleration sensor ages, the power supply is unstable, and the collected data is invalid when the steel pipe is not vibrating.

[0004] The purpose of the present invention is achieved by adopting the following technical solutions:

[0005] A device for measuring the wind-induced vibration acceleration of a steel pipe component of a transmission tower, comprising:

[0006] A bracket fixed to the steel pipe component of the transmission tower;

[0007] A leaf spring, the two ends of which are hinged to the bracket, and the natural vibration frequency of which is equal to or close to the natural vibration frequency of the steel pipe component;

[0008] A rack fixed to the middle of the leaf spring;

[0009] A generator fixed to the bracket, and the rack is in transmission connection with the input shaft end of the generator;

[0010] An acceleration sensor fixed to the bracket and electrically connected to the generator.

[0011] Further, the bracket includes legs and a flat plate fixed on the legs; the legs are fixed on the steel pipe; the leaf spring is fixed between the legs; the generator and the acceleration sensor are fixed on the flat plate.

[0012] Further, the legs are fixed on the steel pipe through a hoop.

[0013] Further, an opening is provided in the middle of the flat plate, the fixed end of the rack is fixed in the middle of the elastic sheet, and the free end passes through the opening and meshes with the gear of the generator.

[0014] Further, there are four legs, and rotating shafts are respectively connected between the two legs on the short side, and both ends of the elastic sheet 2 are respectively fixed on the two rotating shafts.

[0015] Further, the rotating shaft is connected to the leg through a bearing to realize the free vibration of the elastic sheet.

[0016] Further, the elastic sheet is strip-shaped.

[0017] Further, the specification size of the elastic sheet is set according to the natural vibration frequency of the steel pipe member.

[0018] Further, the elastic sheet is made of a high-elastic metal material.

[0019] Further, the high-elastic metal material is one or more of beryllium copper alloy, spring steel, and 65Mn steel sheet.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The wind-induced acceleration measurement device for the steel pipe member of the transmission tower of the present invention is based on the resonance principle, uses elastic sheets with equal or similar natural vibration frequencies to capture the vibration of the steel pipe, and converts the vibration energy into electrical energy through the rack and the generator to supply power to the acceleration sensor, without an additional power supply device, and has a simple and reliable structure and good durability. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the wind-induced acceleration measurement device for the steel pipe member of the transmission tower in Embodiment 1 of the present invention;

[0023] Figure 2 It is an installation schematic diagram of the wind-induced acceleration measurement device for the steel pipe member of the transmission tower in Embodiment 1 of the present invention;

[0024] Figure 3 It is a principle simulation diagram of vortex-induced vibration;

[0025] Figure 4 It is a schematic diagram of the steel pipe member in Embodiment 2 of the present invention;

[0026] Figure 5 It is an installation schematic diagram of the wind-induced acceleration measurement device for the steel pipe member of the transmission tower in Embodiment 2 of the present invention;

[0027] Figure 6 It is a time history diagram of the output voltage of the generator in Embodiment 2 of the present invention;

[0028] Figure 7It is the vibration acceleration time history diagram of Embodiment 2 of the present invention;

[0029] Wherein, 1. Bracket; 101. Support leg; 102. Flat plate; 103. Rotating shaft; 2. Elastic sheet; 3. Rack; 4. Generator; 5. Acceleration sensor; 6. Hoop. Specific embodiments

[0030] The present invention will be further described below in conjunction with the drawings and embodiments.

[0031] Embodiment 1

[0032] Vortex-induced vibration occurs in a steel pipe with a diameter of 100 mm of a certain steel pipe tower, and a wind vibration acceleration measuring device for steel pipe components of a transmission tower is installed.

[0033] A wind vibration acceleration measuring device for steel pipe components of a transmission tower provided in this embodiment, as Figure 1 shown,

[0034] includes a bracket 1, which is fixed to the steel pipe component of the transmission tower; an elastic sheet 2, the two ends of which are hinged to the bracket 1, and the natural vibration frequency is equal to or close to the natural vibration frequency of the steel pipe component;

[0035] a rack 3, which is fixed to the middle of the elastic sheet 2;

[0036] a generator 4, which is fixed to the bracket 1, and the rack 3 is in transmission connection with the input shaft end of the generator;

[0037] an acceleration sensor 5, which is fixed to the bracket 1 and is electrically connected to the generator 4.

[0038] In this embodiment, the acceleration sensor 5 is internally provided with a 3000 mAh lithium battery, which serves as a regulated power supply and outputs 5V3A.

[0039] As a preferred implementation manner of this embodiment, the bracket 1 includes support legs 101 and a flat plate 102 fixed on the support legs 101; the support legs 101 are fixed on the steel pipe; the elastic sheet 2 is fixed between the support legs 101; the generator 4 and the acceleration sensor 5 are fixed on the flat plate 102.

[0040] As a specific implementation manner of this embodiment, the support legs 101 are fixed on the steel pipe through a hoop 6, as Figure 2 shown.

[0041] There is an opening in the middle of the flat plate 102. In this embodiment, the opening is a square opening. The fixed end of the rack 3 is fixed in the middle of the elastic sheet 2, and the free end passes through the opening in the middle of the flat plate 102 of the bracket 1 and meshes with the gear of the generator 4.

[0042] As a preferred embodiment of this embodiment, there are four legs 101. A rotating shaft 103 is installed between the two legs 101 located on the short side of the flat plate 102. In this embodiment, the rotating shaft 103 is a circular rotating shaft. The elastic sheet 2 is fixed on the rotating shaft 103.

[0043] The rotating shaft 103 is connected to the leg 101 through a bearing to realize the free vibration of the elastic sheet 2. When the steel pipe and the elastic sheet 2 resonate, the rotating shaft 103 rotates, increasing the vibration amplitude of the elastic sheet 2.

[0044] As a preferred embodiment of this embodiment, the elastic sheet 2 is strip-shaped and made of a high-elastic metal material, preferably beryllium copper alloy, spring steel, 65Mn steel sheet, etc. The specification size of the elastic sheet 2 is set according to the natural vibration frequency of the steel pipe. By adjusting the length, width or material properties of the elastic sheet 2, its natural vibration frequency is matched with that of the steel pipe.

[0045] The working principle of the wind-induced vibration acceleration measurement device for the steel pipe member of the transmission tower in this embodiment is as follows:

[0046] When any non-streamlined object is immersed in a uniform oncoming flow, vortices will be alternately released on the backflow surface of the object. The release of vortices will generate uneven pressure on the surface of the object, which will cause the object to be subjected to pulsating pressures in the flow direction and transverse direction. The pulsating pressure will induce periodic vibration of the object, that is, vortex-induced vibration, as Figure 3 shown.

[0047] When the steel pipe member undergoes vortex-induced vibration in the wind flow, it causes the elastic sheet 2 to resonate, driving the rack 3 on the elastic sheet 2 to move up and down, and then driving the gear of the generator 4 to rotate. The generator 4 enters the working state, powers the acceleration sensor 5, and thus collects the vibration data of the steel pipe. When there is no wind, the generator 4 and the acceleration sensor 5 do not work. The wind-induced vibration acceleration measurement device for the steel pipe member of the transmission tower of the present invention can collect the vibration energy of the steel pipe for power generation, and then supply power to the acceleration sensor, without an additional power supply device, and the durability of the device is better.

[0048] Embodiment 2

[0049] The terrain in Inner Mongolia is relatively flat, the wind force is stable and continuous, and the steel pipe tower is prone to vortex-induced vibration. As Figure 4 shown, it is a schematic diagram of the steel pipe member of the transmission tower in this embodiment. The positions marked with red circles in the figure are the vibration-prone members.

[0050] Select Figure 4 Rod B in it as the test object. This rod is horizontally arranged, with a height of 10 m from the ground, a length of about 8 m, and a diameter of 194 mm. The wind-induced vibration acceleration measurement device is fixed in the middle of the steel pipe by a hoop, and the installation is located at the upper part of the steel pipe. The schematic diagram of the installation position is as Figure 5 shown.

[0051] When the steel pipe vibrates, it drives the elastic sheet 2 and the rack 3 of the wind vibration acceleration measuring device to vibrate. The engine 4 starts to supply power to the acceleration sensor 5 to complete the acquisition of the vibration acceleration of the steel pipe. After the steel pipe continues to vibrate, the power generation data of the generator is collected for 1 to 10 minutes to obtain the time history diagram of the generator output voltage, as Figure 6 shown; the acceleration data is collected for 1 to 10 minutes to obtain the time history diagram of the vibration acceleration, as Figure 7 shown.

[0052] Embodiment 3

[0053] The wind vibration acceleration measuring device for the steel pipe member of the transmission tower in this embodiment includes a bracket 1, which is fixed to the steel pipe member of the transmission tower; an elastic sheet 2, the two ends of which are hinged to the bracket 1 and the natural vibration frequency of which is equal to or close to the natural vibration frequency of the steel pipe member; a rack 3, which is fixed to the middle of the elastic sheet 2; a generator 4, which is fixed to the bracket 1, and the rack 3 is in transmission connection with the input shaft end of the generator; an acceleration sensor 5, which is fixed to the bracket 1 and is electrically connected to the generator 4.

[0054] The selection types of the generator 4 include:

[0055] Electromagnetic vibration generator: This generator can generate electricity efficiently under the condition of small vibration. Its rotor can move freely back and forth in the stator magnetic field and can work normally even in the micro-vibration environment.

[0056] Micro-generator based on piezoelectric effect: For example, a micro-generator using a piezoelectric cantilever beam structure can achieve efficient energy conversion under low-frequency vibration. This generator drives the magnet to move through the mass block of the cantilever beam, thereby generating electric energy.

[0057] Design based on triboelectric nanogenerator (TENG): This generator collects small-amplitude vibration energy through a folding umbrella structure and optimizes the output performance by stacking materials such as fluororubber, effectively capturing low-frequency small-amplitude vibration energy.

[0058] Internal resonance-based electromagnetic vibration generator (BVEH): This generator can achieve efficient energy acquisition in a small amplitude range by adjusting the mass, stiffness and damping parameters. Its design allows capturing a wide range of frequencies under low amplitude conditions.

[0059] Portable vibration generator: For example, a low-speed vibration generator based on the magneto-vibration effect can generate a relatively high voltage and power at low frequencies and is suitable for portable devices.

[0060] On this basis, the present invention uses a rack + gear transmission, and amplifies the rotation angle through a gear set to improve the power generation persistence and stability.

[0061] The necessary technical content not described is the same as that in Embodiment 1 or is prior art, so it will not be elaborated here.

[0062] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A wind-induced vibration acceleration measuring device for steel pipe components of a transmission tower, characterized in that, include: A bracket (1) fixed to the steel pipe component of the power transmission tower; The spring piece (2) has two ends hinged to the bracket (1) and a natural vibration frequency that is equal to or close to the natural vibration frequency of the steel pipe component; A rack (3) fixed to the middle of the spring sheet (2); A generator (4) is fixed to the bracket (1), and the rack (3) is drivingly connected to the input shaft end of the generator; An acceleration sensor (5) is fixed to the bracket (1) and is electrically connected to the generator (4).

2. The measuring device according to claim 1, characterized in that, The support (1) comprises a support leg (101) and a plate (102) fixed on the support leg (101); the support leg (101) is fixed on the steel pipe; the spring sheet (2) is fixed between the support legs (101); and the generator (4) and the acceleration sensor (5) are fixed on the plate (102).

3. The measuring device according to claim 2, characterized in that, The supporting leg (101) is fixed on the steel pipe via a clamp (6).

4. The measuring device according to claim 2, characterized in that, An opening is provided in the middle of the flat plate (102); the fixed end of the rack (3) is fixed to the middle of the spring sheet (2); and the free end passes through the opening to mesh with the gear of the generator (4).

5. The measuring device according to claim 2, characterized in that, There are four supporting legs (101), and a rotating shaft (103) is respectively connected between two supporting legs (101) on the short sides, and two ends of the spring sheet (2) are respectively fixed on the two rotating shafts (103).

6. The measuring device according to claim 5, characterized in that, The rotating shaft (103) is connected to the supporting leg (101) via a bearing to achieve free vibration of the spring sheet (2).

7. The measuring device according to claim 1, characterized in that, The spring piece (2) is in the shape of an elongated strip.

8. The measuring device according to claim 1, characterized in that, The specification and size of the spring piece (2) are set according to the natural frequency of the steel pipe component.

9. The measuring device according to claim 1, characterized in that, The spring piece (2) is made of a highly elastic metal material.

10. The measuring device according to claim 9, characterized in that The highly elastic metal material is one or more of beryllium copper alloy, spring steel, and 65Mn steel sheet.

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