High-reliability grounding device for lightning protection of fan

Abstract

The utility model provides a highly reliable grounding device for fan lightning protection, belonging to the technical field of lightning protection grounding devices, comprising a grounding rod, a rebound core, a pair of clamping plates and a pair of clamping half tubes, one end of the grounding rod is provided with a counter bore, the rebound core is embedded in the counter bore, the rebound core has a vertically upward rebound trend, and the clamping plates are clamped in the clamping half tubes. The ground rod is sleeved with the pair of clamping plates, a clamping gap exists between the pair of clamping plates and is used for clamping the ground plate, one end of each clamping half pipe is connected with the ground rod in a clamped mode, a clamping cavity is formed in the center of each clamping half pipe and is used for clamping the downlead, and the clamping half pipes are connected with the ground rod in a clamped mode. The end portion of the downlead is in contact with the grounding rod and the rebound core, the rebound core is in a compressed state, and the pair of clamping half tubes can be close to each other and locked. The grounding device does not need to be welded, so that a tedious welding process is saved, and the fatal defect that rigid connection is easy to break is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of lightning protection grounding devices, and specifically relates to a highly reliable grounding device for wind turbine lightning protection. Background Technology

[0002] Lightning protection for wind turbines refers to the systematic protection of the entire wind turbine. As the capacity of individual wind turbine units continues to increase, the height of the turbine hub and the highest point of the blades are also constantly rising. In open fields, mountaintops, and coastal areas, the probability of wind turbines being struck by lightning is very high. Feedback from various wind farms indicates that lightning strikes are not only a significant factor causing wind turbine malfunctions and shutdowns, but also directly affect the safe operation of the wind farm. Generally, lightning rods and matching lightning protection devices are installed at the top of the wind turbine, with down conductors leading to the bottom of the turbine. Grounding rods and grounding plates are installed on the ground at the bottom of the turbine. Currently, the down conductors, grounding rods, and grounding plates are connected by welding. However, welding is a cumbersome process, the weld points are prone to corrosion leading to increased resistance, and the rigid connection makes it susceptible to breakage.

[0003] For example, utility model patent CN202020328966.9 discloses an installation device for a lightning protection grounding device, including a grounding rod, a connecting plate, and a down conductor. A threaded groove is vertically formed at the center of the top of the grounding rod. The connecting plate is placed on top of the grounding rod, and a fixing hole is formed near the threaded groove on the top of the connecting plate. A fixing docking block is also provided on the top of the connecting plate. This utility model's installation device for a lightning protection grounding device, through its structure including the fixing docking block, threaded post, fixing hole, fixing clamp, and threaded rod, makes the installation of the lightning protection grounding device more convenient and quick. Installation is completed simply by connecting the connecting plate to the grounding rod via the fixing threaded post and threaded groove, and then connecting the down conductor to the fixing docking block. This greatly saves installation time and solves the problems of inconvenient installation and easy breakage at the connection points of lightning protection grounding devices.

[0004] In existing devices, the down conductor and the fixed docking block are fixed together by a fixing clamp to achieve the docking function. However, the clamping surface (i.e., the anti-slip layer) of the fixing clamp is made of rubber and does not have a conductive function. Therefore, only the down conductor and the fixed docking block have a conductive function. Metals have the property of thermal expansion and contraction. In terrains such as plateaus, mountains, and deserts, the temperature difference between day and night is large. When metal is heated, its volume will expand, and when it is cooled, it will contract. During the expansion and contraction process of the down conductor and the fixed docking block, the docking point between the down conductor and the fixed docking block can easily break, and the conductive function will not be achieved, causing the lightning protection function of the down conductor to fail. Utility Model Content

[0005] Based on this, the present invention provides a highly reliable grounding device for wind turbine lightning protection, in order to solve the technical problem that in the prior art, at the junction of the down conductor and the fixed connecting block, the thermal expansion and contraction of metal can easily cause the junction of the down conductor and the fixed connecting block to break, thus failing to conduct electricity and causing the lightning protection function of the down conductor to fail.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A high-reliability grounding device for wind turbine lightning protection, used to connect down conductors and grounding plates, includes a grounding rod, a spring core, a pair of clamping plates, and a pair of engaging half-tubes. One end of the grounding rod has a countersunk hole, and the spring core is embedded within the countersunk hole, exhibiting a vertically upward spring-back tendency. The pair of clamping plates are sleeved on the grounding rod, with a clamping gap between them for clamping the grounding plate. One end of each engaging half-tube engages with the grounding rod, and a engaging cavity is formed in the center of the pair of engaging half-tubes for engaging the down conductor. The end of the down conductor is in contact with the grounding rod and the spring core, and the spring core is in a compressed state. The pair of engaging half-tubes can approach and lock together.

[0008] Preferably, the rebound core includes a rebound spring and a core rod body. The rebound spring is disposed at the bottom of the countersunk hole, and the core rod body is tightly nested in the countersunk hole. The core rod body is in contact with the rebound spring and is located above the rebound spring.

[0009] Preferably, the countersunk hole is provided with a groove, the groove is located on the side near the end of the grounding rod, and the core rod body is provided with a patterned protrusion, the patterned protrusion being adapted to the groove.

[0010] Preferably, the rebound core further includes a temporary stop pin, a first locking hole is provided on the side wall of the grounding rod, and a second locking hole is provided on the core body. In the first state, the temporary stop pin passes through the second locking hole and extends into the first locking hole.

[0011] Preferably, the core rod body is further provided with an avoidance groove. In the second state, the temporary stop pin passes through the second locking hole and extends into the avoidance groove. The temporary stop pin is provided with a first jumping member and a second jumping member. The first jumping member is located on the side close to the avoidance groove, and the second jumping member is located on the side away from the avoidance groove.

[0012] Preferably, the clamping plate is provided with a plurality of first stud nuts, which are used to tighten a pair of clamping plates.

[0013] Preferably, the engaging half-tube is provided with a plurality of sets of second stud nuts, which are used to tighten a pair of engaging half-tubes.

[0014] Preferably, the engaging half-tube has an arc-shaped protrusion on the inner wall near the end, and the grounding rod has a groove on the side wall near the end, with the arc-shaped protrusion engaging in the groove.

[0015] Preferably, the inner wall of the locking half tube is further provided with a first locking block, the surface of which is toothed.

[0016] Preferably, the inner wall of the locking half tube is further provided with a second locking block, the second locking block is connected to the first locking block and located below the first locking block, the surface of the second locking block is flush with the first locking block and the end face of the second locking block is lower than the end face of the first locking block.

[0017] Preferably, the inner wall of the locking half tube is provided with a limiting groove, and the first locking block and the second locking block are detachably disposed in the limiting groove.

[0018] Preferably, a locking screw hole is provided through the side wall of the engaging half tube, and a locking pin is provided in the engaging half tube. The locking pin is screwed into the locking screw hole, and the locking pin has a pointed tip facing the surface of the lead wire.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] (1) The grounding device is easy and quick to install and simple to use. Only 1-2 staff members are needed to complete the connection between the grounding rod, the down conductor and the grounding plate.

[0021] (2) The grounding device does not require welding, saving the cumbersome welding process and avoiding the fatal defect of rigid connection being easy to break.

[0022] (3) The grounding device has a wide range of applications and is suitable for various terrains. For terrains with large temperature differences (plateaus, mountains, deserts, etc.), even if the grounding rod and the down conductor are disconnected due to the thermal expansion and contraction of metal, the rebound core will remain in a rebound state and will continue to be connected to the down conductor, thus avoiding the failure of the lightning protection function of the down conductor and the grounding rod. Attached Figure Description

[0023] Figure 1 Isometric drawing of a high-reliability grounding device for wind turbine lightning protection.

[0024] Figure 2 Front view of a high-reliability grounding device for wind turbine lightning protection.

[0025] Figure 3for Figure 2 AA half-section view.

[0026] Figure 4 for Figure 3 Enlarged view of a portion of the first state.

[0027] Figure 5 for Figure 3 Second state partial magnification view.

[0028] Figure 6 Left view of a high-reliability grounding device for wind turbine lightning protection.

[0029] Figure 7 for Figure 6 BB half-section view.

[0030] Figure 8 This is an isometric view of the grounding rod and clamping plate.

[0031] Figure 9 This is an isometric view of the mandrel body.

[0032] Figure 10 This is a half-sectional view of the mandrel body.

[0033] Figure 11 This is an isometric drawing of the spring.

[0034] Figure 12 Axonometric drawing of the clamping half-tube.

[0035] Figure 13 The image shows the isometric view of the first and second locking blocks.

[0036] In the diagram: grounding rod 100, countersunk hole 110, groove 111, first locking hole 120, groove 130, spring core 200, return spring 210, core rod body 220, patterned protrusion 221, second locking hole 222, clearance groove 223, temporary stop pin 230, first jumping component 231, second jumping component 232, clamping plate 300, first stud nut 310, locking half tube 400, second stud nut 410, arc-shaped protrusion 420, first locking block 430, second locking block 440, limiting groove 450, locking screw hole 460, locking screw pin 470, lead wire 500, grounding plate 600. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0038] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0039] Please refer to Figures 1 to 13 A high-reliability grounding device for wind turbine lightning protection, used to connect down conductor 500 and grounding plate 600, includes grounding rod 100, spring core 200, a pair of clamping plates 300 and a pair of locking half tubes 400.

[0040] The grounding rod 100 is made of existing grounding rods, such as copper-plated steel grounding rod 100 or galvanized steel grounding rod 100. The length of the grounding rod 100 can be selected as 1.5m, 2m, etc., and a countersunk hole 110 is provided at one end of the grounding rod 100.

[0041] The spring core 200 is embedded in the countersunk hole 110, that is, the outer wall of the spring core 200 is in contact with the inner wall of the countersunk hole 110, achieving good conductivity. The spring core 200 has a vertical upward springing tendency. When the spring core 200 is compressed, the spring core 200 is under force and can move upward.

[0042] A pair of clamping plates 300 are sleeved on the grounding rod 100, and there is a clamping gap between the pair of clamping plates 300. The width of the clamping gap is adapted to the thickness of the grounding plate 600, which is used to clamp the grounding plate 600 and make the grounding plate 600 and the clamping plate 300 contact each other, and the grounding plate 600 and the clamping plate 300 are relatively fixed.

[0043] One end of the locking half tube 400 is locked to the grounding rod 100. The locking method can be one of welding locking, hook locking, pressure locking, riveting locking, or bolt locking. A locking cavity is formed in the center of the pair of locking half tubes 400. The diameter of the locking cavity is adapted to the diameter of the down conductor 500 for locking the down conductor 500. The end of the down conductor 500 is in contact with the grounding rod 100 and the spring core 200. The spring core 200 is in a compressed state. The pair of locking half tubes 400 can approach each other and lock together.

[0044] Specific usage process:

[0045] Dig a pit in the ground where the grounding rod 100 needs to be installed, and install the grounding rod 100 vertically in the pit with the opening of the countersunk hole 110 facing upwards. Embed the spring core 200 into the countersunk hole 110 (before installing the spring core 200, some conductive liquid can be added to the countersunk hole 110). Since the spring core 200 is in its original state (uncompressed), the end of the spring core 200 is higher than the end of the grounding rod 100. Install the locking half tube 400 at the end of the grounding rod 100, and fit the down conductor 500 into the locking cavity. The down conductor 500 moves down or onto the grounding rod 100. The spring core 200 is compressed and retracted completely into the countersunk hole 110, meaning the upper surface of the spring core 200 is flush with the upper surface of the grounding rod 100. Simultaneously, the end face of the down conductor 500 is in contact with both the end faces of the spring core 200 and the grounding rod 100. Then, the pair of engaging half-tubes 400 are retracted, brought closer together, and locked to prevent the down conductor 500 from moving within the engaging cavity. Next, the grounding plate 600 is installed in the clamping gap between the pair of clamping plates 300 and fixed, ensuring that the clamping plates 300 and the grounding plate 600 are in contact. Finally, the hole is filled (a resistance-reducing agent can be added to the hole), completing the connection between the grounding rod 100, the down conductor 500, and the grounding plate 600. This grounding device is easy and quick to install and simple to use, requiring only 1-2 workers to complete the connection between the grounding rod 100, down conductor 500, and grounding plate 600. Secondly, this grounding device eliminates the need for welding, saving on tedious welding processes and avoiding the fatal flaw of rigid connections being prone to breakage. Thirdly, this grounding device has a wide range of applications and is suitable for various terrains. Even in terrains with large temperature differences (plateaus, mountains, deserts, etc.), even if the grounding rod 100 and down conductor 500 break due to the thermal expansion and contraction characteristics of metals, the spring-loaded core 200 remains in a spring-loaded state, continuously connecting to the down conductor 500, ensuring a constant connection and preventing the lightning protection function of the down conductor 500 and grounding rod 100 from failing.

[0046] In one possible embodiment, see Figure 3 , Figure 7 , Figure 9 , Figure 10 and Figure 11The rebound core 200 includes a return spring 210 and a core rod body 220. The return spring 210 and the core rod body 220 can be integrally connected, or they can be separately disposed. The return spring 210 is disposed at the bottom of the countersunk hole 110. When the return spring 210 is installed in the countersunk hole 110, a portion of conductive liquid is added to the countersunk hole 110 to increase the conductivity of the return spring 210 and prevent lightning current from damaging the return spring 210. The core rod body 220 is tightly nested in the countersunk hole 110. The core rod body 220 is in contact with the return spring 210 and is located above the return spring 210. When the return spring 210 is not compressed, the core rod body 220 is installed in the countersunk hole 110. The upper end face of the core rod body 220 is higher than the upper end face of the grounding rod 100. When the return spring 210 is compressed, the upper end face of the core rod body 220 can be flush with the upper end face of the grounding rod 100. Since the core rod body 220 is tightly nested in the countersunk hole 110, the resistance between the core rod body 220 and the grounding rod 100 is reduced, which is more conducive to guiding lightning current.

[0047] Specifically, the core rod body 220 is made of the same material as the grounding rod 100, which is a galvanized steel rod or a copper-plated steel rod.

[0048] In a preferred embodiment, see Figure 9 If the contact area between the core rod body 220 and the grounding rod 100 is small, the resistivity of the contact point between the core rod body 220 and the grounding rod 100 will increase. When the lightning current is too large, it will damage the core rod body 220, causing the lightning protection function to fail. Therefore, a groove portion 111 is provided in the countersunk hole 110. The groove portion 111 is located on the side near the end of the grounding rod 100. The core rod body 220 is provided with a patterned protrusion 221. The patterned protrusion 221 is adapted to the groove portion 111. Through the mutual contact between the groove portion 111 and the patterned protrusion 221, the contact area between the core rod body 220 and the grounding rod 100 can be increased, thereby reducing the resistivity of the contact point between the core rod body 220 and the grounding rod 100, allowing the lightning current to be smoothly guided into the ground.

[0049] Specifically, the opening pattern of the groove portion 111 can be either a plum blossom pattern or a toothed pattern.

[0050] In one possible embodiment, see Figure 3 and Figure 9Because the upper surface of the core rod body 220 is higher than the upper surface of the grounding rod 100 when the spring core 200 is in the initial position, when installing the down conductor 500 in the locking half tube 400, it is necessary for the operator to push the spring core 200 into a compressed state and also for the operator to lock the down conductor 500 through the locking half tube 400. It requires two operators to cooperate in the installation, and it is quite difficult for one operator to install it. Therefore, the rebound core 200 also includes a temporary stop pin 230. The grounding rod 100 has a first locking hole 120 on its side wall and a second locking hole 222 on its core body 220. In the first state, the temporary stop pin 230 passes through the second locking hole 222 and extends into the first locking hole 120. Specifically, the temporary stop pin 230 is a cylinder, and the first locking hole 120 and the second locking hole 222 are circular holes. The diameter of the temporary stop pin 230 is adapted to the diameter of the first locking hole 120 and the diameter of the second locking hole 222. When the spring-loaded core 200 is installed in the countersunk hole 110, the operator presses the core rod body 220, and the spring-loaded core 210 is compressed and contracts. When the end face of the core rod body 220 is flush with the end face of the grounding rod 100, the first locking hole 120 and the second locking hole 222 are coaxial. The temporary stop pin 230 passes through the second locking hole 222 and extends into the first locking hole 120, temporarily preventing the core rod body 220 from popping out of the countersunk hole 110, thus achieving the goal of controlling the core rod body. The locking pin 220 and the return spring 210 limit the movement, and the end face of the core rod body 220 is flush with the end face of the grounding rod 100, which facilitates the subsequent installation of the down conductor 500. It is only necessary to align the end face of the down conductor 500 with the end face of the grounding rod 100. After the down conductor 500 is installed and fixed, the temporary stop pin 230 is pulled out, and the return spring 210 rebounds, pushing the core rod body 220 to move upward, so that the core rod body 220 and the down conductor 500 are in constant contact.

[0051] Specifically, in order to facilitate the coaxial alignment of the first locking hole 120 and the second locking hole 222, a first limiting line is provided on the end face of the grounding rod 100, and a second limiting line is provided on the end face of the core rod body 220. When the end face of the core rod body 220 is flush with the end face of the grounding rod 100, and the first limiting line and the second limiting line are aligned with each other, the first locking hole 120 and the second locking hole 222 are in a coaxial alignment state.

[0052] In one possible embodiment, see Figure 9Conductive liquid may be present in the countersunk hole 110. To prevent the conductive liquid from evaporating and to prevent soil from entering the second countersunk hole 222 through the first countersunk hole 120, thus avoiding obstruction of the movement of the mandrel body 220 within the countersunk hole 110, a clearance groove 223 is also provided on the mandrel body 220. In the second state, the temporary stop pin 230 passes through the second countersunk hole 222 and extends into the clearance groove 223. That is, when the temporary stop pin 230 is pulled out, its end retracts from the first countersunk hole 120 and into the clearance groove 223. The return spring 210 pushes the mandrel body 220 to move, and the temporary stop pin 230 moves relative to the clearance groove 223 without obstructing the movement of the mandrel body 220. The temporary stop pin 230 prevents soil from entering the first countersunk hole 120 and also slows down the evaporation of the conductive liquid.

[0053] Specifically, to prevent the temporary stop pin 230 from re-entering the second locking hole 222, the temporary stop pin 230 is provided with a first release member 231 and a second release member 232. The first release member 231 is located on the side closer to the clearance groove 223, and the second release member 232 is located on the side farther from the clearance groove 223. For initial installation, please refer to... Figure 4 First, press the first retracting member 231 to retract it, and the temporary stop pin 230 enters the first locking hole 120. When the first retracting member 231 enters the countersunk hole 110, the first retracting member 231 springs back, preventing the temporary stop pin 230 from exiting the first locking hole 120. At this time, the second retracting member 232 is located outside the grounding rod 100. Continue to press the second retracting member 232 to push the temporary stop pin 230 to continue moving until the end of the temporary stop pin 230 enters the second locking hole 222; see also Figure 5 When the temporary stop pin 230 enters the clearance groove 223, the temporary stop pin 230 is pulled out. The end of the temporary stop pin 230 is located in the clearance groove 223. At this time, the first jumping member 231 is located on the inner wall of the countersunk hole 110, and the second jumping member 232 is located on the outer wall of the grounding rod 100. The temporary stop pin 230 is limited by the first jumping member 231 and the second jumping member 232 to prevent the temporary stop pin 230 from exiting the first locking hole 120.

[0054] Specifically, the first jumping element 231 is a spring retraction element, belonging to existing devices. Specifically, the first jumping element 231 includes a spring and a blocking block. The spring is fixedly disposed within the temporary stop pin 230, and the blocking block is disposed at the end of the spring. When the blocking block is pressed, the spring retracts, and the spring and the blocking block retract into the temporary stop pin 230. When no force is applied, the spring rebounds, causing the blocking block to extend to the outer surface of the temporary stop pin 230. The structure of the second jumping element 232 is the same as that of the first jumping element 231.

[0055] In one possible embodiment, see Figure 1 The clamping plate 300 is provided with several sets of first stud nuts 310, which tighten a pair of clamping plates 300. Generally, there are four sets of first stud nuts 310. One clamping plate 300 is fixedly mounted on the side wall of the grounding rod 100, and another clamping plate 300 is movably sleeved on the grounding rod 100, clamping the grounding plate 600 between a pair of clamping plates 300. The grounding plate 600 is limited by the four sets of first stud nuts 310, and then the first stud nuts 310 are contracted to achieve the function of fixing and limiting the grounding plate 600.

[0056] Specifically, the clamping plate 300 is provided with adjustable bolt holes, and the first stud nut 310 can move within the adjustable bolt holes to adapt to different widths of the grounding plate 600, and to clamp and fix the grounding plate 600.

[0057] In one possible embodiment, see Figure 1 The engaging half-tube 400 is provided with several sets of second stud nuts 410, which are used to tighten a pair of engaging half-tubes 400. A pair of engaging half-tubes 400 are connected by a bolt-type snap-fit. Generally, there are four sets of second stud nuts 410, which are respectively located at the upper and lower ends of the engaging half-tube 400. The snap-fit ​​using second stud nuts 410 is convenient to use, provides a more reliable fastening, and the second stud nuts 410 are easier to find and replace.

[0058] Specifically, to ensure a more secure fastening of the second stud nut 410, a double-ended nut is used for fixing.

[0059] In one possible embodiment, see Figure 12The locking half-tube 400 has an arc-shaped protrusion 420 on its inner wall near the end, and the grounding rod 100 has a recessed groove 130 on its side wall near the end. The arc-shaped protrusion 420 is engaged within the recessed groove 130. The height of the arc-shaped protrusion 420 matches the depth of the recessed groove 130, thus engaging the arc-shaped protrusion 420 within the recessed groove 130 to limit and fix both, making the engagement between the locking half-tube 400 and the grounding rod 100 more secure. At the same time, it can prevent the locking half-tube 400 from moving up and down along the vertical direction of the grounding rod 100.

[0060] In one possible embodiment, see Figure 13 The inner wall of the locking half-tube 400 is also provided with a first locking block 430, the surface of which is toothed. When the locking half-tubes 400 are locked together, the teeth on the surface of the first locking block 430 will tightly engage with the surface of the down conductor 500, and the toothed part will penetrate into the surface of the down conductor 500, thereby achieving mutual locking between the locking half-tube 400 and the down conductor 500, realizing the one-time locking of the down conductor 500 and the locking half-tube 400, and preventing the end face of the down conductor 500 from separating from the end face of the grounding rod 100 and the end face of the rebound core 200.

[0061] In a preferred embodiment, the inner wall of the engaging half-tube 400 is further provided with a second locking block 440. The second locking block 440 is connected to the first locking block 430, integrally formed, and located below the first locking block 430. The surface of the second locking block 440 is flush with the first locking block 430, and the end face of the second locking block 440 is lower than the end face of the first locking block 430. Specifically, the end face of the second locking block 440 is slightly lower than the end face of the first locking block 430. When the teeth of the first locking block 430 penetrate the surface of the lead wire 500, the second locking block 440 will clamp tightly with the lead wire 500, increasing the contact area between the lead wire 500 and the second locking block 440, thereby achieving secondary locking of the lead wire 500 and the engaging half-tube 400 and preventing the lead wire 500 from moving up and down in the vertical direction.

[0062] In one possible embodiment, the diameter of the down conductor 500 is typically 8 mm or more. For a thicker down conductor 500, the first and second locking blocks cannot lock it securely; thinner first and second locking blocks need to be used instead. A limiting groove 450 is provided on the inner wall of the engaging half-tube 400. (See also...) Figure 12The first locking block 430 and the second locking block 440 are detachably disposed within the limiting groove 450. The outer walls of the first locking block 430 and the second locking block 440 are in close contact with the inner wall of the limiting groove 450, and the heights of the first locking block 430 and the second locking block 440 are adapted to each other, so that they can be tightly limited within the limiting groove 450 without displacement or sliding. When the first locking block 430 and the second locking block 440 cannot engage with the lead wire 500, the original first locking block 430 and the second locking block 440 are removed from the limiting groove 450, and first locking blocks 430 and second locking blocks 440 of different sizes are replaced to match the lead wire 500.

[0063] In one possible embodiment, see Figure 12 To further secure the lead wire 500, a locking screw hole 460 is provided through the side wall of the engaging half tube 400, and a locking pin 470 is provided in the engaging half tube 400. The locking pin 470 is screwed into the locking screw hole 460, and the locking pin 470 has a pointed tip facing the surface of the lead wire 500. When the end face of the down conductor 500 comes into contact with the end face of the grounding rod 100, the first locking block 430 and the second locking block 440 are locked to the down conductor 500. Then, the locking screw is turned, and the locking screw rotates in the locking screw hole 460, so that the locking screw pin 470 has a pointed tip that approaches the surface of the down conductor 500 and penetrates the surface of the down conductor 500, thereby achieving a three-stage locking of the down conductor 500 and preventing the end face of the down conductor 500 from separating from the end face of the grounding rod 100 and the end face of the spring core 200.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-reliability grounding device for wind turbine lightning protection, used for connection with down conductors and grounding plates, characterized in that, The device includes a grounding rod, a spring-loaded core, a pair of clamping plates, and a pair of engaging half-tubes. One end of the grounding rod has a countersunk hole, and the spring-loaded core is embedded in the countersunk hole with a vertically upward spring-loaded tendency. The pair of clamping plates are sleeved on the grounding rod, and there is a clamping gap between the pair of clamping plates for clamping the grounding plate. One end of the engaging half-tubes is engaged with the grounding rod, and a engaging cavity is formed in the center of the pair of engaging half-tubes for engaging the down conductor. The end of the down conductor is in contact with the grounding rod and the spring-loaded core, and the spring-loaded core is in a compressed state. The pair of engaging half-tubes can approach each other and lock together.

2. The high-reliability grounding device for wind turbine lightning protection as described in claim 1, characterized in that, The rebound core includes a rebound spring and a core rod body. The rebound spring is disposed at the bottom of the countersunk hole, and the core rod body is tightly nested in the countersunk hole. The core rod body is in contact with the rebound spring and is located above the rebound spring.

3. The high-reliability grounding device for wind turbine lightning protection as described in claim 2, characterized in that, The countersunk hole is provided with a groove, which is located on the side near the end of the grounding rod. The core rod body is provided with a patterned protrusion, which is adapted to the groove.

4. The high-reliability grounding device for wind turbine lightning protection as described in claim 2, characterized in that, The spring core also includes a temporary stop pin. A first locking hole is provided on the side wall of the grounding rod, and a second locking hole is provided on the core body. In the first state, the temporary stop pin passes through the second locking hole and extends into the first locking hole.

5. The high-reliability grounding device for wind turbine lightning protection as described in claim 4, characterized in that, The core rod body is also provided with an avoidance groove. In the second state, the temporary stop pin passes through the second locking hole and extends into the avoidance groove. The temporary stop pin is provided with a first jumping member and a second jumping member. The first jumping member is located on the side close to the avoidance groove, and the second jumping member is located on the side away from the avoidance groove.

6. The high-reliability grounding device for wind turbine lightning protection as described in claim 1, characterized in that, An arc-shaped protrusion is provided on the inner wall of the end of the locking half tube, and a groove is provided on the side wall of the end of the grounding rod, with the arc-shaped protrusion engaging in the groove.

7. The high-reliability grounding device for wind turbine lightning protection as described in claim 6, characterized in that, The inner wall of the locking half-tube is also provided with a first locking block, the surface of which is toothed.

8. The high-reliability grounding device for wind turbine lightning protection as described in claim 7, characterized in that, The inner wall of the locking half tube is also provided with a second locking block, which is connected to the first locking block and located below the first locking block. The surface of the second locking block is flush with the first locking block, and the end face of the second locking block is lower than the end face of the first locking block.

9. The high-reliability grounding device for wind turbine lightning protection as described in claim 8, characterized in that, The inner wall of the locking half-tube is provided with a limiting groove, and the first locking block and the second locking block are detachably disposed in the limiting groove.

10. The high-reliability grounding device for wind turbine lightning protection as described in claim 8, characterized in that, A locking screw hole is provided through the side wall of the locking half tube, and a locking screw is provided in the locking half tube. The locking screw is screwed into the locking screw hole, and the locking screw has a pointed tip that faces the surface of the lead wire.

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