Portable blade tip lightning protection conduction measuring device

Abstract

The utility model discloses a portable blade tip lightning protection conduction measuring device, and the device comprises a main frame which is made of a conductive material; the elastic contact electrode is arranged on the inner wall surface and / or the outer wall surface of the main frame body; one end of the conduction rope is connected to the outer wall surface of the main frame body and is conductively connected with the elastic contact electrode; one end of the main rope is connected to the edge of the main frame body, one end of the wind cable is connected to the edge of the main frame body, and the main rope and the wind cable are both made of insulating materials.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a portable blade tip lightning protection conductivity measurement device. Background Technology

[0002] As doubly-fed wind turbines develop towards higher power outputs, the blades are becoming longer, but this also increases the risk of lightning strikes. Therefore, it is necessary to perform lightning protection grounding continuity measurements on the blades. However, wind turbine blades are mostly installed on high-altitude towers, making it impossible for testing personnel to perform measurements from the ground. Utility Model Content

[0003] Therefore, this application discloses the following technical solution:

[0004] The first aspect of this application provides a portable blade tip lightning protection continuity measurement device, comprising:

[0005] The main frame is made of a conductive material.

[0006] Elastic contact electrodes installed on the inner and / or outer wall surfaces of the main frame;

[0007] A conductive rope, one end of which is connected to the outer wall of the main frame and electrically connected to the elastic contact electrode;

[0008] The main rope and the guy rope are provided. One end of the main rope is connected to the edge of the main frame, and one end of the guy rope is also connected to the edge of the main frame. Both the main rope and the guy rope are made of insulating material.

[0009] Optional, also includes:

[0010] Multiple steel reinforcement frames are used to support the main frame, and the steel reinforcement frames are installed radially on the main frame.

[0011] Optionally, a camera may also be included, which is mounted on any of the steel reinforcement frames.

[0012] Optionally, the steel reinforcement cage has a connecting structure at one end of the edge of the main frame, and one end of the main rope is connected to the connecting structure at the edge of the main frame.

[0013] Optionally, the main frame is a wire mesh frame.

[0014] Optionally, the elastic contact electrode includes a steel wire bundle contact electrode and a metal rod contact electrode, wherein the metal rod contact electrode is movably mounted on the main frame.

[0015] Optionally, the surface of the metal rod contact electrode has metal burrs.

[0016] Optionally, it may also include a contact electrode for mounting the conductive rope;

[0017] The contact electrode is located on the outer wall surface of the main frame.

[0018] Optionally, the guy rope includes a first guy rope and a second guy rope disposed opposite to each other on the edge of the main frame.

[0019] Optionally, the edges of the main frame are covered with an insulating flexible isolation layer;

[0020] The flexible isolation layer is made of any one of rubber, PVC, or artificial leather.

[0021] The beneficial effect of this application is that, during lightning protection continuity testing of wind turbine blades, testing personnel on and below the tower can adjust the height of the measuring device to the blade's lightning arrester using the main rope and guy rope, ensuring that the device's elastic contact electrode is in close contact with the blade's lightning arrester. This allows for continuity measurement of the blade's lightning arrester using the elastic contact electrode and the conductive rope connected to it. Therefore, the device of this application can solve the current problem of conducting lightning protection continuity measurements on wind turbine blades from the ground. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a lightning arrester for a wind turbine blade provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a portable blade tip lightning protection conductivity measuring device provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram illustrating a usage scenario of a portable blade tip lightning protection conductivity measurement device provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram illustrating a usage scenario of another portable blade tip lightning protection conductivity measurement device provided in this application embodiment;

[0027] Figure 5 This is a schematic diagram illustrating a usage scenario of another portable blade tip lightning protection conductivity measurement device provided in this application embodiment. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] First, let me briefly describe the application scenarios of the measuring device in this embodiment.

[0030] Please see Figure 1 This is a schematic diagram of a wind turbine. To prevent damage to the wind turbine blades from lightning strikes, a lightning arrester can be installed on each blade. The lightning arrester can be a metal structure of a specific shape. The lightning arrester can be installed at the tip of the blade, such as... Figure 1 As shown in (1); or it can be installed in the middle of the blade away from the tip, such as Figure 1 (2)

[0031] The installed lightning rod is partially exposed to the air, and it can be grounded through the conductive structure inside the blade. In this way, the lightning rod can conduct lightning to the ground and prevent the main structure of the blade from being struck by lightning.

[0032] To ensure that the lightning rod can function properly for lightning protection, a lightning protection continuity test is required. The test works by applying a test current to the lightning rod and measuring the resistance between it and the ground. This resistance value determines whether there is proper conductivity between the lightning rod and the ground. If there is conductivity, the lightning rod is confirmed to be effective for lightning protection; if there is no conductivity, the lightning rod may not be able to provide lightning protection, requiring inspection and maintenance. The above testing process describes the lightning protection continuity measurement procedure for blade-type lightning rods.

[0033] However, as Figure 1 As shown, the lightning arrester installed on the wind turbine blade is located in mid-air, making it difficult for testers to apply test current to the lightning arrester on the ground, which poses a certain challenge to the lightning protection conduction measurement of the lightning arrester.

[0034] Therefore, this embodiment provides a portable blade tip lightning protection continuity measurement device. Please refer to [link to relevant documentation]. Figure 2 This is a schematic diagram of the device. Figure 2 (1) is a three-dimensional view of the measuring device, and (2) is a side view of the measuring device. Figure 2 (3) is a top view of the measuring device. Figure 2 (4) is a front view of another measuring device.

[0035] The measuring device may include a main rope 1, a main frame 3, an elastic contact pole 5, a conductor rope 7, and a wind rope 8.

[0036] The main frame is made of a conductive material. In some embodiments, to reduce the weight of the measuring device and the influence of wind resistance during the measurement process, the main frame can be made of lightweight wire mesh; that is, the main frame can be a wire mesh frame.

[0037] The resilient contact electrode 5 may include resilient contact electrodes mounted on the inner wall and / or outer wall of the main frame. As some examples, the resilient contact electrode 5 may be mounted on the inner wall of the main frame; in this case, the structure of the measuring device in this embodiment may be as follows: Figure 2 As shown in (1) to (3). As other examples, the elastic contact electrode can also be installed on the outer wall of the main frame, in which case the structure of the measuring device in this embodiment can be as follows. Figure 2 shown in (4).

[0038] A measuring device may include two resilient contact electrodes 5, one mounted on the inner wall and the other on the outer wall. Alternatively, a measuring device may include only one resilient contact electrode 5, which the tester can adjust the mounting position of according to the installation location and shape of the lightning arrester on the blade, mounting the resilient contact electrode on the inner or outer wall so that the resilient contact electrode can effectively reach the portion of the lightning arrester exposed to air.

[0039] For example, when the lightning rod to be measured is installed at the tip of the blade, the elastic contact electrode can be installed on the inner wall surface; when the lightning rod to be measured is installed in the middle of the blade, away from the tip, the elastic contact electrode can be installed on the outer wall surface.

[0040] The conductive rope 7 has one end connected to the outer wall of the main frame and electrically connected to the elastic contact electrode. The conductive rope 7 can have a certain length so that when the measuring device contacts the lightning arrester in mid-air, the other end of the conductive rope can be located on the ground and electrically connected to the power supply. The power supply is used to generate the test current applied to the lightning arrester.

[0041] Since the main frame is made of conductive material, the conductive rope and the elastic contact electrode can be connected in the following way: one end of the conductive rope is fixed at any position on the main frame and the conductive rope is conductively connected to the main frame, while the elastic contact electrode is conductively connected to the main frame. Thus, the conductive rope and the elastic contact electrode can be conductively connected through the main frame.

[0042] The main rope 1 and the guy rope 8 are connected at one end to the edge of the main frame, and at the other end of the guy rope. Both the main rope and the guy rope are made of insulating material. The free ends of the main rope and the guy rope not connected to the main frame can be controlled by the tester during actual measurement, allowing the tester to control the position of the measuring device in mid-air using the main rope and the guy rope.

[0043] As examples, both the main rope and the guy rope can be made of nylon. Furthermore, insulation can be applied to the contact points between the main rope and the main frame, and between the guy rope and the main frame, to prevent leakage of test current from causing electric shock to the test personnel controlling the rope.

[0044] It needs to be explained that, Figure 2 This is only used to illustrate the relative positional relationships of the various parts in the measuring device of this embodiment. In specific embodiments, the shapes of the various parts are not limited to... Figure 2 The shape shown. For example, the elastic contact electrode 5 can have various shapes, and correspondingly can present various contours, not limited to... Figure 2 The rectangular outline shown.

[0045] Optionally, the measuring device in this embodiment may further include:

[0046] Multiple steel reinforcement cages are used to support the main frame, and the steel reinforcement cages are installed radially on the main frame.

[0047] by Figure 2 (3) As an example, the steel reinforcement cage 9 can be set at each of the main stress points of the main frame and extend radially from the center of the main frame to the edge of the main frame. On the one hand, these steel reinforcement cages can support the main frame and provide the main frame with a certain resistance to deformation. On the other hand, these steel reinforcement cages can be used to fix various structures installed on the main frame, including but not limited to the main rope and wind rope mentioned above.

[0048] In some alternative embodiments, the measuring device may also include a camera 4, see [link to relevant documentation]. Figure 2 The camera can be mounted on any steel frame, specifically on one end of the steel frame near the edge of the main frame, and can be extended upwards from the main frame via a bracket.

[0049] When using the measuring device of this embodiment, the camera 4 can communicate with a display on the ground to transmit the real-time captured images to the display for display, so that the test personnel on the ground and / or in the wind turbine nacelle can adjust the position of the measuring device based on the images they see.

[0050] Camera 4 can be equipped with a built-in battery and wireless transmission module. It can use the battery power to capture images and use the wireless transmission module to transmit the captured images to one or more wirelessly connected displays for display.

[0051] Camera 4 can also be connected to a portable power source and monitor on the ground or in the cabin via wires and data cables. It can use the portable power source to capture images and transmit the images via the data cable. The wires and data cables can be attached to any of the conductor rope, main rope, and guy rope, or they can be an independent line.

[0052] Optional, see further Figure 2 (2) One end of one of the steel reinforcement frames of the measuring device located at the edge of the main frame can have a connecting structure 2. The connecting structure can be a lifting point with at least one through hole. One end of the main rope can be connected to the connecting structure at the edge of the main frame, for example, it can pass through the through hole of the lifting point and be tied to the lifting point.

[0053] In some optional embodiments, the measuring device may further include a contact electrode 6, which may be one or more, for example, it may include a first contact electrode and / or a second contact electrode; the first contact electrode is located on the outer wall surface of the main frame; the second contact electrode is located on the inner wall surface of the main frame; and a conductive rope is attached to the first contact electrode.

[0054] Each contact pole can serve as a base for fixing the conductive rope. When using this measuring device, the tester can connect the conductive rope to a specific contact pole as needed.

[0055] As an example, please see Figure 2 (2) The measuring device may include a first contact electrode 6 located on the outer wall of the main frame, a conductive rope 7 may be attached to the first contact electrode 6, and an elastic contact electrode 5 may be installed on the inner wall of the main frame, thereby making an electrical connection between the elastic contact electrode 5, the main frame, the first contact electrode 6 and the conductive rope 7.

[0056] In some alternative embodiments, the measuring device may have multiple guy ropes, so as to... Figure 2 For example, (3) can have two guy ropes, including a first guy rope and a second guy rope set opposite each other at the edge of the main frame.

[0057] By setting two or more guy ropes, testers can more flexibly control the position of the measuring device in the air, thus making it easier to complete the measurement.

[0058] Optionally, multiple guy ropes can be prepared in advance, and during actual use, the on-site testing personnel can attach one or more guy ropes to the main frame system as needed.

[0059] In any embodiment of this application, the elastic contact electrode can be detachably installed on the main frame (including but not limited to bolts, clips, etc.).

[0060] The beneficial effect of this application is that, during lightning protection continuity testing of wind turbine blades, testing personnel on and below the tower can adjust the height of the measuring device to the blade's lightning arrester using the main rope and guy rope, ensuring that the device's elastic contact electrode is in close contact with the blade's lightning arrester. This allows for continuity measurement of the blade's lightning arrester using the elastic contact electrode and the conductive rope connected to it. Therefore, the device of this application can solve the current problem of conducting lightning protection continuity measurements on wind turbine blades from the ground.

[0061] In the measuring device of this embodiment, the elastic contact electrode can have various structures. As some examples, the elastic contact electrode can include a steel wire bundle contact electrode and a metal rod contact electrode, and the metal rod contact electrode can be movably mounted on the main frame.

[0062] The wire bundle contact electrode can include several fine and tough wire bundles. These wire bundles have high hardness and elasticity, and can adhere to the lightning arrester on the blade within a certain range.

[0063] The metal rod contact electrode can include several rigid metal rods. These metal rods can be installed on the main frame through movable connection methods such as springs and sleeve structures. Thus, when the tester moves the measuring device, these metal rod contact electrodes can change their positions accordingly to better contact the lightning arrester.

[0064] In the measuring device provided in this application, the structure of the elastic contact electrode may include, but is not limited to, the structure described above. Specifically, depending on the shape of the lightning arrester in the actual application scenario, the tester may select and install other optional elastic contact electrodes.

[0065] As an example, the wire mesh is the main frame of the aforementioned embodiment, and the wire bundles and metal rods inside the main frame are the wire bundle contact electrodes and metal rod contact electrodes installed on the inner wall of the main frame in the above embodiment.

[0066] Optionally, the surface of the metal rod contact electrode may have metal burrs, and the surface of the steel wire bundle contact electrode may also have metal burrs.

[0067] The advantages of setting the aforementioned metal burrs are:

[0068] On the one hand, a large number of metal burrs can increase the contact area between the elastic contact electrode and the lightning arrester, making it easier for the elastic contact electrode to contact the lightning arrester over a large area, thus avoiding the inability to perform measurements smoothly due to poor contact between the elastic contact electrode and the lightning arrester.

[0069] On the other hand, when the device of this embodiment is used for measurement, the tester can repeatedly move the measuring device near the lightning arrester. At this time, the metal burrs can rub the surface of the lightning arrester to remove impurities such as rust, paint and dust that may affect the measurement results, thereby improving the accuracy of the measurement results and cleaning the exposed surface of the lightning arrester.

[0070] In some optional embodiments, the free ends of the aforementioned wire bundle and metal rod, that is, the ends not installed on the wall of the main frame, can also be fixed with bolts. The function of these bolts is that, when the device of this embodiment is used for measurement, the tester can repeatedly move the measuring device near the lightning arrester, thereby using the aforementioned bolts to rub the surface of the lightning arrester to remove impurities such as rust, paint, and dust that may affect the measurement results, improve the accuracy of the measurement results, and also clean the exposed surface of the lightning arrester.

[0071] In some alternative embodiments, the edges of the main frame are covered with an insulating flexible insulating layer; the flexible insulating layer is made of any one of rubber, PVC, or artificial leather.

[0072] For example, the edge of the main frame may include a flexible insulation layer made of polyvinyl chloride (PVC) hose.

[0073] On the one hand, when the measuring device in this embodiment rubs near the lightning arrester, these flexible isolation layers can reduce the wear of the main frame edge on the blade surface. On the other hand, when carrying the measuring device, the flexible isolation layers can provide a convenient gripping position for the test personnel, improving the portability of the measuring device. Furthermore, when used for measurement, the insulating material of the flexible isolation layers can further isolate the main frame from the main rope, as well as the main frame from the guy rope, improving safety.

[0074] Based on the structure of the above-described measuring device, the process of performing lightning protection continuity measurement using the measuring device of this embodiment will be described below.

[0075] In use, one tester can first use the internal crane of the wind turbine to transport the main rope and auxiliary equipment for pulling the main rope into the nacelle. Another tester on the ground can install the flexible contact electrode at a suitable position on the main frame according to the shape and type of the lightning arrester and its position on the blade.

[0076] As an example, if the lightning arrester is located at the tip of the blade, for example, at... Figure 1 As shown in (1), the elastic contact electrode can be installed on the inner wall of the main frame. If the lightning arrester is located in the middle of the blade, for example, at... Figure 1 The elastic contact electrode can be installed on the outer wall of the main frame at the position shown in (2).

[0077] After the flexible contact electrode is installed, the ground tester can tie the conductive rope to the contact electrode of the main frame to make the conductive rope, contact electrode, main frame and flexible contact electrode electrically connected. Then the resistance test can be performed to confirm that the conductivity between the conductive rope, contact electrode, main frame and flexible contact electrode is good, so as not to interfere with the test results.

[0078] Once the testing personnel on the tower (i.e., the testing personnel inside the cabin) have taken necessary safety precautions and confirmed that the conditions for conducting the conduction work are met, the main rope can be lowered from the cabin to the ground. The testing personnel below the tower can then attach the main rope and guy rope to the suspension points on the steel frame. The testing personnel on the tower can then pull the main rope upwards to raise the main frame to the height where the lightning arrester on the blade is located. At the same time, the testing personnel below the tower can pull the guy rope, working in conjunction with the main rope, to bring the main frame closer to the lightning arrester on the blade. Furthermore, the pressure between the elastic contact electrode and the lightning arrester on the blade can be adjusted by pulling the guy rope, ensuring that the elastic contact electrode and the lightning arrester on the blade are in the closest possible contact.

[0079] When the flexible contact electrode contacts the lightning arrester, if the lightning arrester is located at the tip of the blade, and the flexible contact electrode is installed on the inner wall of the main frame, the positional relationship between the main frame and the blade can be as follows: Figure 3 (1) and Figure 4 As shown, the main frame covers the tip of the blade, so that the elastic contact electrode on the inner wall surface contacts the lightning rod at the tip. This method of use can be applied to the measurement of lightning rods such as aluminum blade tip lightning rods or lightning rod pins installed at the tip of the blade.

[0080] When the flexible contact electrode contacts the lightning arrester, if the lightning arrester is located in the middle of the blade, far from the blade tip, the flexible contact electrode is installed on the outer wall of the main frame. In this case, the positional relationship between the main frame and the blade can be as follows: Figure 3 (2) and Figure 5 As shown, the outer wall of the main frame is tightly attached to the blade surface under the traction of the wind rope, and the elastic contact electrode of the outer wall is in contact with the lightning rod. This method of use is suitable for measurement in scenarios where the lightning rod is far from the blade tip, or where the lightning rod is a lightning rod pin installed in the middle of the blade.

[0081] After the elastic contact electrode and the lightning arrester are brought into close contact, the test personnel on and below the tower can cooperate with each other to pull the main frame repeatedly near the lightning arrester by pulling the main rope and the guy rope. This allows the elastic contact electrode to rub against the surface of the lightning arrester, enabling the elastic contact electrode to penetrate the oxide layer, rust, paint and dust on the surface of the lightning arrester.

[0082] After sufficient friction, ground-based testers can connect the conductor rope to the ground power supply, and then turn on the power supply to output test current. Thus, the test current of the power supply can be input to the lightning arrester on the blade through the path formed by the conductor rope, contact electrode, main frame and elastic contact electrode. Ground-based or tower-based testers can then measure the current flowing from the lightning arrester to the ground, or measure the voltage between the lightning arrester and the ground. Based on the measured values, they can determine whether the lightning arrester can guide the current to the ground, thereby completing the lightning protection continuity measurement of the lightning arrester.

[0083] During the power supply output test current period, the ground test personnel can continuously pull the guy rope to maintain a certain tension during the process. Moreover, the steel wire density of the contact electrode is very high, with dozens of steel wires in an area of ​​one square centimeter. This ensures that during the output test current period, the elastic contact electrode can make effective contact with the lightning arrester to transmit current normally, avoiding the impact of poor contact on the measurement results.

[0084] With cameras present, during the traction of the main rope and / or guy ropes, monitors on and below the tower can display the footage captured by the cameras, and test personnel on and below the tower can observe the footage displayed on the monitors to assist in traction.

[0085] Generally, testers can perform multiple measurements on the same lightning arrester. That is, they output a test current once, measure once to obtain a measurement value, then stop outputting the test current, fine-tune the position of the main frame, output the test current again, measure a second time to obtain a second measurement, and so on to obtain multiple measurement values. Then, they analyze the fluctuations of multiple measurement values ​​to determine the reliability of the measurement data.

[0086] Optionally, when the wind turbine crane is outside the wind turbine tower, the main rope can be pulled directly by the crane, which is convenient and reliable; when the wind turbine crane is inside the wind turbine tower, the main rope can be released from the nacelle skylight, and an electric winch can be used to lift the main frame.

[0087] It should be noted that the wind turbine blades can remain stationary during the above measurement process for measurement purposes.

[0088] In the measuring device of this embodiment, the following connections can be made in a detachable manner: between the conductor rope 7 and the contact electrode 6, between the main frame and the elastic contact electrode 5, between the main rope 1 and the suspension point of the steel reinforcement frame, between the camera and the steel reinforcement frame, and between the guy rope and the steel reinforcement frame. During use, the on-site test personnel connect the above components to perform the measurement. After the measurement is completed, they can be disassembled, stored and carried separately, which is convenient for the test personnel to carry.

[0089] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0090] For ease of description, the above systems or devices are described separately as various modules or units based on their functions. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware components.

[0091] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0092] Finally, it should be noted that in this document, relational terms such as first, second, third, and fourth are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0093] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A portable blade tip lightning protection conductivity measuring device, characterized in that, include: The main frame is made of a conductive material. Elastic contact electrodes installed on the inner and / or outer wall surfaces of the main frame; A conductive rope, one end of which is connected to the outer wall of the main frame and electrically connected to the elastic contact electrode; The main rope and the guy rope are provided. One end of the main rope is connected to the edge of the main frame, and one end of the guy rope is also connected to the edge of the main frame. Both the main rope and the guy rope are made of insulating material.

2. The apparatus according to claim 1, characterized in that, Also includes: Multiple steel reinforcement frames are used to support the main frame, and the steel reinforcement frames are installed radially on the main frame.

3. The apparatus according to claim 2, characterized in that, It also includes a camera, which is mounted on any of the steel reinforcement frames.

4. The apparatus according to claim 3, characterized in that, The steel reinforcement cage has a connecting structure at one end of the edge of the main frame, and one end of the main rope is connected to the connecting structure at the edge of the main frame.

5. The apparatus according to claim 1, characterized in that, The main frame is a wire mesh frame.

6. The apparatus according to claim 1, characterized in that, The elastic contact electrode includes a steel wire bundle contact electrode and a metal rod contact electrode, and the metal rod contact electrode is movably mounted on the main frame.

7. The apparatus according to claim 6, characterized in that, The surface of the metal rod contact electrode has metal burrs.

8. The apparatus according to claim 1, characterized in that, It also includes a contact electrode for mounting the conductive rope; The contact electrode is located on the outer wall surface of the main frame.

9. The apparatus according to claim 1, characterized in that, The guy ropes include a first guy rope and a second guy rope disposed opposite to each other on the edge of the main frame.

10. The apparatus according to claim 1, characterized in that, The edges of the main frame are covered with an insulating flexible isolation layer; The flexible isolation layer is made of any one of rubber, PVC, or artificial leather.

Images