Friction nanometer generator for capturing vibration energy of bridge and monitoring displacement of pier beam

Abstract

The invention belongs to the field of friction nano-generators, and particularly relates to a friction nano-generator used for capturing vibration energy of a bridge and monitoring displacement of a pier beam. According to the technical scheme, the device comprises a base, a support, a bearing platform, a vertical spring, a first horizontal spring, a second horizontal spring, a power generation unit and a monitoring unit, the base is of a square shell structure, the support is of a cylindrical shell structure, the support is arranged in the base, the monitoring unit is arranged between the base and the bottom of the support, and the bearing platform is arranged on the bearing platform. Four horizontal springs I are respectively arranged between the centers of the four walls of the base and the support; the bottom wall of the bearing platform is connected with the support through vertical springs, four second horizontal springs are evenly distributed between the bearing platform and the support, and a power generation unit is arranged between the bearing platform and the support. According to the invention, bridge vibration energy can be converted into electric energy, and pier beam displacement can be monitored in real time.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of friction nanogenerators, and particularly relates to a friction nanogenerator for capturing vibration energy of a bridge and monitoring pier beam displacement. BACKGROUND

[0002] Railway bridges present increasingly large spans and more complex structural forms in design and construction, and while ensuring transportation safety, they also face a series of challenges such as bridge vibration, structural fatigue, and environmental impact during construction. Railway bridges are affected by various excitation factors during operation. In remote areas, these sensors need energy supply, maintenance and replacement. The pier beam structure of a railway bridge is also crucial to the stability and safety of the bridge, and changes in pier beam displacement directly affect the overall health of the bridge. Therefore, real-time monitoring and early warning of the pier beam displacement of a railway bridge become an important guarantee for ensuring the safe operation of the bridge. SUMMARY

[0003] The application provides a friction nanogenerator for capturing vibration energy of a bridge and monitoring pier beam displacement, which can convert bridge vibration energy into electrical energy and monitor pier beam displacement in real time.

[0004] The technical scheme of the application is as follows:

[0005] The friction nanogenerator for capturing vibration energy of a bridge and monitoring pier beam displacement comprises a base, a support, a bearing platform, vertical springs, horizontal springs one, horizontal springs two, a power generation unit and a monitoring unit. The base is a square shell structure, the support is a cylindrical shell structure, the support is arranged in the base, the monitoring unit is arranged between the base and the bottom of the support, and four horizontal springs one are arranged between the center of the four walls of the base and the support. The bottom wall of the bearing platform is connected to the support through vertical springs, and four horizontal springs two are evenly arranged between the bearing platform and the support. The power generation unit is arranged between the bearing platform and the support.

[0006] Further, the friction nanogenerator for capturing vibration energy of a bridge and monitoring pier beam displacement comprises a cross-shaped slide rail, four sliders, four circular arc plates, four connecting rods, a FEP film and a monitoring electrode. The cross-shaped slide rail is fixedly installed on the bottom wall of the base, the four sliders are slidably connected to the four tracks of the cross-shaped slide rail, the circular arc plates are connected together through the connecting rods and the sliders, the inner wall of the circular arc plate is fixedly connected to the outer wall of the support, the outer wall of the circular arc plate is fixedly connected to one end of the horizontal spring one, and the other end of the horizontal spring one is fixedly connected to the center of the side wall of the base. The slider is provided with a FEP film, and the cross-shaped slide rail is provided with a monitoring electrode.

[0007] Further, the friction nanogenerator for capturing the vibration energy of the bridge and monitoring the pier beam displacement, the lower part of the load bearing platform is a circular table, the outer edge of the circular table is uniformly provided with four blind holes; one end of the horizontal spring two is fixedly provided with a hemispherical head, the other end of the horizontal spring two is provided with a sleeve; the inner wall of the support is uniformly provided with four top blocks, the sleeve is placed in the blind hole, and the hemispherical head is attached to the top block.

[0008] Further, the friction nanogenerator for capturing the vibration energy of the bridge and monitoring the pier beam displacement, the power generation unit comprises a PTFE film and a copper electrode, the PTFE film is arranged around the circular table, and the copper electrode is arranged on the inner wall of the support; the PTFE film is in frictional attachment with the copper electrode.

[0009] Further, the friction nanogenerator for capturing the vibration energy of the bridge and monitoring the pier beam displacement, the monitoring electrode is composed of a plurality of parallel electrode sheets, the spacing between the electrode sheets is equal, and two adjacent electrode sheets form an electrode pair.

[0010] The working principle of the above-mentioned friction nanogenerator is as follows:

[0011] The base of the friction nanogenerator for capturing the vibration energy of the bridge and monitoring the pier beam displacement is fixedly connected with the pier, and the load bearing platform is fixedly connected with the bridge.

[0012] When the train passes or the wind load acts on the bridge, the bridge will vibrate vertically, the power generation unit converts mechanical energy into electrical energy to provide power supply for the bridge sensor. In the initial state, the railway bridge vibration drives the PTFE film and the copper electrode to contact and attach; as the vibration continues, the PTFE film and the copper electrode gradually separate, the potential difference generates an electric signal, and the voltage is saturated; the cycle is repeated, realizing the stable conversion of the railway bridge vibration energy and outputting the current.

[0013] The monitoring unit monitors the relative displacement change between the bridge and the pier in real time, and evaluates the health condition of the bridge through the measurement of the pier beam displacement. When the displacement change occurs between the slider and the cross-shaped slide rail, the friction effect between the FEP film on the slider and the monitoring electrode on the cross-shaped slide rail will cause the transfer of electric charge, so that the monitoring unit generates an electric signal. The number of these electric signal peaks is proportional to the displacement of the slider, and the displacement of the slider can be calculated through the change of the signal.

[0014] The beneficial effects of the present application are:

[0015] 1. The track vibration environment is irregular when the train is running, and the device designed by the present application collects vibration energy and monitors the pier beam displacement in real time, which provides a new solution for bridge health monitoring and energy collection according to the low-frequency vibration characteristics of the railway bridge.

[0016] 2、The application establishes the relationship between the voltage signal and the pier beam displacement by designing the monitoring unit. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 Schematic diagram of a friction nanogenerator for capturing vibration energy of a bridge and monitoring pier beam displacement;

[0018] Fig. 2 Front view cross-sectional view of a friction nanogenerator for capturing vibration energy of a bridge and monitoring pier beam displacement;

[0019] Fig. 3 Explosion schematic diagram of a friction nanogenerator for capturing vibration energy of a bridge and monitoring pier beam displacement. DETAILED DESCRIPTION

[0020] As Figs. 1-3 shown, the friction nanogenerator for capturing vibration energy of a bridge and monitoring pier beam displacement includes a base 1, a support 2, a bearing platform 3, a vertical spring 5, a horizontal spring one 4, a horizontal spring two 10, a power generation unit and a monitoring unit, the base 1 is a square shell structure, the support 2 is a cylindrical shell structure, the support 2 is arranged in the base 1, the monitoring unit is arranged between the base 1 and the bottom of the support 2, and four horizontal springs one 4 are arranged between the center of the four walls of the base 1 and the support 2; the bottom wall of the bearing platform 3 is connected with the support 2 through the vertical spring 5, four horizontal springs two 10 are arranged between the bearing platform 3 and the support 2, and the power generation unit is arranged between the bearing platform 3 and the support 2.

[0021] The monitoring unit includes a cross-shaped slide rail 6, four sliding blocks 7, four arc plates 9, four connecting rods 8, a FEP film and a monitoring electrode, the cross-shaped slide rail 6 is fixedly installed on the bottom wall of the base 1, the four sliding blocks 7 are slidably connected with the four tracks of the cross-shaped slide rail 6, the arc plates 9 are connected together through the connecting rods 8 and the sliding blocks 7, the inner wall of the arc plate 9 is fixedly connected with the outer wall of the support 2, the outer wall of the arc plate 9 is fixedly connected with one end of the horizontal spring one 4, and the other end of the horizontal spring one 4 is fixedly connected with the center of the side wall of the base 1; the sliding block 7 is provided with a FEP film, and the cross-shaped slide rail 6 is provided with a monitoring electrode; the monitoring electrode is composed of a plurality of parallel electrode sheets, the spacing between the electrode sheets is equal, and adjacent two electrode sheets form an electrode pair.

[0022] The lower part of the load-bearing platform 3 is a circular table 13, the outer edge of which is uniformly provided with four blind holes; one end of the horizontal spring two 10 is fixedly provided with a hemispherical head 11, and the other end of the horizontal spring two 10 is provided with a sleeve; the inner wall of the support 2 is uniformly provided with four jacks 12, the sleeve is placed in the blind hole, and the hemispherical head 11 is attached to the jack 12. The power generation unit includes a PTFE film and a copper electrode, the PTFE film is arranged around the circular table 13, the copper electrode is arranged on the inner wall of the support 2, and the PTFE film is in frictional attachment with the copper electrode.

[0023] The working process is as follows:

[0024] The base 1 of the friction nanogenerator for capturing the vibration energy of the bridge and monitoring the pier beam displacement is fixedly connected with the pier, and the load-bearing platform 3 is fixedly connected with the bridge.

[0025] When the train passes or the wind load acts on the bridge, the bridge will vibrate vertically, and the power generation unit will convert mechanical energy into electrical energy to provide power supply for the bridge sensor. In the initial state, the railway bridge vibration drives the PTFE film and the copper electrode to contact and attach; as the vibration continues, the PTFE film and the copper electrode gradually separate, the potential difference generates an electric signal, and the voltage saturates; the cycle is repeated, realizing the stable conversion of the railway bridge vibration energy and outputting the current.

[0026] The monitoring unit monitors the relative displacement change between the bridge and the pier in real time, and evaluates the health condition of the bridge by measuring the displacement of the pier beam. When the displacement change occurs between the slider 7 and the cross-shaped slide rail 6, the friction between the FEP film on the slider 7 and the monitoring electrode on the cross-shaped slide rail 6 will cause the transfer of electric charge, so that the monitoring unit generates an electric signal. The number of these electric signal peaks is proportional to the displacement of the slider, and the displacement of the slider can be calculated through the change of the signal.

Claims

1. A frictional nanogenerator for capturing vibrational energy of a bridge and monitoring pier-girder displacement, characterized in that, The utility model provides a kind of monitoring device for vertical spring, it include base, support, bearing platform, vertical spring, horizontal spring one, horizontal spring two, power generation unit and monitoring unit, the base is square shell structure, the support is cylindrical shell structure, the support is arranged in the base, monitoring unit is equipped between the base and the bottom of support, four horizontal spring one are respectively equipped between the center of four walls of the base and the support;The bottom wall of the bearing platform is connected between the support by vertical spring, four horizontal spring two are evenly distributed between the bearing platform and the support, and power generation unit is arranged between the bearing platform and the support.

2. The frictional nanogenerator for harvesting vibrational energy of a bridge and monitoring pier-girder displacement according to claim 1, wherein, The monitoring unit includes cross-shaped slide rail, four sliders, four arc plates, four connecting rods, FEP film and monitoring electrode, cross-shaped slide rail is fixedly installed on the bottom wall of the base, four sliders are slidably connected with four tracks of cross-shaped slide rail respectively, the arc plate is connected together with the slider by the connecting rod, the inner wall of the arc plate is fixedly connected with the outer wall of the support, the outer wall of the arc plate is fixedly connected with one end of horizontal spring one, and the other end of horizontal spring one is fixedly connected with the center of the side wall of the base;The slider is provided with FEP film, and cross-shaped slide rail is provided with monitoring electrode.

3. The frictional nanogenerator for harvesting vibrational energy of a bridge and monitoring pier-girder displacement according to claim 1, wherein, The lower part of the bearing platform is a circular table, and four blind holes are uniformly arranged on the outer edge of the circular table;One end of horizontal spring two is fixedly provided with a hemispherical head, and the other end of horizontal spring two is provided with a sleeve;Four jacks are uniformly arranged on the inner wall of the support, the sleeve is placed in the blind hole, and the hemispherical head is attached to the jack.

4. The frictional nanogenerator for harvesting vibrational energy of a bridge and monitoring pier-girder displacement according to claim 3, wherein, The power generation unit includes PTFE film and copper electrode, PTFE film is arranged around the circular table, copper electrode is arranged on the inner wall of the support, and PTFE film is in frictional attachment with the copper electrode.

5. The frictional nanogenerator for harvesting vibrational energy of a bridge and monitoring pier-girder displacement according to claim 3, wherein, The monitoring electrode is composed of a plurality of electrode pieces arranged side by side, the spacing between the electrode pieces is equal, and two adjacent electrode pieces form an electrode pair.

Images