Grounding resistance measurement auxiliary device for lightning protection detection of ancient buildings

Abstract

The utility model provides a kind of ground resistance measurement auxiliary device of ancient building lightning protection detection, comprising: holding pole and conducting wire clamp, conducting wire clamp is connected in the upper end of holding pole, for clamping down lead; File surface structure, file surface structure is set on the inner side of conducting wire clamp for clamping down lead;Wire, wire is connected with conducting wire clamp.The utility model connects conducting wire clamp by adopting multistage telescopic pole type holding pole, and resistance tester is connected conducting wire clamp contact down lead by wire to carry out ground resistance measurement, so that operator can stand ground control telescopic holding pole, cancel high-altitude manual operation link, eliminate falling hidden danger, realize non-contact measurement;And by setting file surface structure on conducting wire clamp, operator can make conducting wire clamp clamping down lead by holding pole and move holding pole to remove down lead surface rust layer, reduce contact resistance, solve the problem of poor conduction caused by down lead surface rust, realize ground single-person safe operation.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection testing technology for ancient buildings, and in particular to an auxiliary device for measuring the grounding resistance of ancient buildings for lightning protection testing. Background Technology

[0002] Ancient buildings are mostly constructed of wood and are often located in high-risk thunderstorm areas near mountains and water, making lightning protection a core aspect of their preservation. According to the annual report on cultural relic safety monitoring, lightning strikes account for 37% of the causes of damage to ancient buildings, and the cost of repair is 3-5 times that of new construction.

[0003] According to the explicit requirements of the International Council on Monuments and Sites (ICOMOS), "wooden heritage sites must establish annually inspected lightning protection systems with a stable grounding resistance value ≤10Ω," and Appendix D of GB / T21431-2015 (Three-electrode method measurement specification), grounding resistance measurement is a core indicator for evaluating the effectiveness of lightning protection systems. However, ancient architectural sites face three major technical bottlenecks: I. Contact Restrictions: The Inspection Standard for Lightning Protection Devices of Cultural Relics Buildings (DB11 / T2016-2022) prohibits inspection tools from directly contacting the ancient building body, and traditional ladders and clamps are prone to causing the building's paint to peel off; II. High-altitude operations: The height of the downlead measuring points is concentrated at 3-5 meters, while traditional scaffolding construction is time-consuming; 3. Data distortion: The exposed lead wire surface has a high corrosion rate, the rust layer makes the resistance falsely high, and causes electromagnetic interference (such as power line radiation) leading to error fluctuations.

[0004] The existing technologies for measuring grounding resistance include the following methods: I. Steel File-Assisted Connection Method: According to the "Technical Manual for Lightning Protection Testing of Ancient Buildings" (China Building Industry Press), "High-altitude testing points for exposed down conductors require the use of a steel file for scraping and connection, in conjunction with an insulated rod." This involves using an insulated rod (3-5 meters long), with one end secured to a steel file with a metal clip, and the other end connected to a grounding resistance tester via a wire. During operation, two workers cooperate: one holds the ladder while the other climbs up, holding the insulated rod and pressing the steel file firmly against the down conductor surface to achieve electrical connection through scraping before measurement. However, this method of applying pressure with a steel file can cause indentations in wooden beams and columns, and the steel file can only remove surface rust in a point-like manner (removal rate <40%). Furthermore, the operation while standing on a ladder more than 2 meters high increases the risk of falls.

[0005] II. Portable Grounding Resistance Testing Box: For example, Chinese Patent CN217766624U, authorized on November 8, 2022, integrates a grounding resistance tester, a wire reel, and a handheld abrasive wheel rust remover into a single box. In use, the operator first climbs the box and uses the abrasive wheel to polish the surface of the lead wire; then, the conductive clamp is replaced to hold the lead wire for measurement. The wire is stored in the reel to prevent tangling. However, this method is inefficient, requiring two separate climbs at a single point (rust removal before measurement).

[0006] Therefore, existing technologies lack auxiliary tools for conveniently measuring grounding resistance when a single person is in a low position during lightning protection testing of ancient buildings. Utility Model Content

[0007] The purpose of this utility model is to provide an auxiliary device for measuring the grounding resistance of ancient buildings for lightning protection testing, which can be used by a single person in a low position to conveniently perform grounding resistance measurement work for lightning protection testing of ancient buildings.

[0008] This utility model provides an auxiliary device for measuring the grounding resistance of ancient buildings for lightning protection testing, comprising: a holding rod and a conductive clamp, the conductive clamp being connected to the upper end of the holding rod for clamping the down conductor; a file-shaped structure, the file-shaped structure being disposed on the inner side of the conductive clamp for clamping the down conductor; and a conductor, the conductor being connected to the conductive clamp.

[0009] Furthermore, it also includes a transmission mechanism, wherein the conductive wire clamp includes a hinged first clamp and a second clamp, and the transmission mechanism is connected to the first clamp or the second clamp.

[0010] Furthermore, the second chuck has extensions on both sides, and the extensions have rotating rings; the first chuck has shafts on both sides; the extensions are located outside the first chuck, and the rotating rings are rotatably sleeved on the shafts.

[0011] Furthermore, the transmission mechanism includes a first trigger, a first winch, and a traction line. One end of the traction line is wound around the first winch, and the other end of the traction line is connected to the rotating ring on one side. The first trigger is connected to the first winch.

[0012] Furthermore, a stop block is provided on the gripping rod on the lower side of the first winch.

[0013] Furthermore, the grip rod is provided with a take-up mechanism, and the wire is wound around the take-up mechanism.

[0014] Furthermore, the take-up mechanism and the transmission mechanism are located on both sides of the grip rod, respectively.

[0015] Furthermore, the take-up mechanism includes a second trigger and a second winch, the wire is wound around the second winch, one end of the wire is connected to the conductive clamp, and the second trigger is connected to the second winch.

[0016] Furthermore, the grip rod is a multi-stage telescopic rod.

[0017] Furthermore, the top end of the gripping rod is hinged to the conductive wire clamp, and a locking element is provided at the hinge, and the rotation direction at the hinge is the same as the transmission direction of the transmission mechanism.

[0018] The technical solution of this utility model adopts a multi-stage telescopic rod gripping rod connected to a conductive clamp, and the resistance tester measures the grounding resistance by connecting the conductive clamp to the down conductor through a wire. This allows the operator to stand on the ground and control the extension and retraction of the gripping rod, eliminating the need for manual work at height, eliminating the risk of fall, and achieving non-contact measurement. Furthermore, by setting a file-like structure on the conductive clamp, the operator can use the gripping rod to clamp the down conductor and move the gripping rod to remove the rust layer on the surface of the down conductor, reducing contact resistance and solving the problem of poor conductivity caused by rust on the surface of the down conductor, thus enabling safe single-person operation on the ground. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model from another perspective; Figure 3 This utility model Figure 2 Enlarged view of point A; Figure 4 This is the front view of the present invention; Figure 5 This utility model Figure 4 Enlarged view of point B; Explanation of reference numerals in the attached figures: 1- Grip the stick; 2-Conductive clamp; 21-First clamp; 211-Shaft; 22-Second clamp; 221-Extension; 222-Rotating ring; 3-File-like structure; 4-Wire; 5-Transmission mechanism; 51-First trigger; 52-First winch; 53-Traction line; 54-Suppressor; 6-Reel-in mechanism; 61-Second trigger; 62-Second winch; 7-Locking component. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1 like Figures 1-5 As shown, this utility model provides an auxiliary device for measuring the grounding resistance of ancient buildings for lightning protection testing, including: a holding rod 1 and a conductive clamp 2, the conductive clamp 2 being connected to the upper end of the holding rod 1 for clamping the down conductor; a file-shaped structure 3, the file-shaped structure 3 being disposed on the inner surface of the conductive clamp 2 for clamping the down conductor; and a conductor 4, the conductor 4 being connected to the conductive clamp 2. The holding rod 1 is a multi-stage telescopic rod.

[0025] Specifically, the grip rod 1 is composed of three sections of T800 carbon fiber tubes (outer diameter 25mm, wall thickness 1.5mm, unfolding ratio 1:3.2, maximum extension length 4m, which can meet the height requirements of most ancient building down conductors). It is lightweight and has insulation properties. There are buckles or damping rings at the telescopic position to limit the telescopic length. This type of telescopic rod structure is existing technology, such as the structure of selfie sticks or tripods, and will not be described in detail.

[0026] The conductive wire clamp 2 is an alligator clip structure made of conductive metal material (such as copper). The file-shaped structure 3 is made of hard conductive metal material (such as copper alloy, which is more wear-resistant). It is a serrated uneven structure on the inner clamping surface of the conductive wire clamp 2 through manufacturing or assembly methods (such as through fitting). When the conductive wire clamp 2 clamps the lead wire, the file-shaped structure 3 can rotate to remove the rust layer on the surface of the lead wire when the operator swings the gripping rod 1.

[0027] The conductor 4 is made of tinned copper wire and is longer than the holding rod 1 (e.g., 10m). In terms of usage posture, the upper end of the conductor 4 is connected to the side of the conductive clamp 2 to indirectly contact the down conductor through the conductor 4 clamp. The lower end of the conductor 4 is connected to a grounding resistance tester to measure the grounding resistance.

[0028] By employing a multi-stage telescopic grip rod 1 connected to a conductive clamp 2, and with the resistance tester connected to the conductive clamp 2 via a wire 4 to measure the grounding resistance of the contact lead wire, the operator can stand on the ground to control the extension and retraction of the grip rod 1, eliminating the need for manual work at height, removing the risk of fall, and achieving non-contact measurement. Furthermore, by setting a file-shaped structure 3 on the conductive clamp 2, the operator can use the grip rod 1 to clamp the conductive clamp 2 to hold the lead wire and move the grip rod 1 to remove the rust layer on the surface of the lead wire, reducing contact resistance and solving the problem of poor conductivity caused by rust on the surface of the lead wire, thus enabling safe single-person operation on the ground.

[0029] Example 2 like Figures 1-5 As shown, it also includes a transmission mechanism 5. The conductive wire clamp 2 includes a hinged first clamp 21 and a second clamp 22. The transmission mechanism 5 is connected to either the first clamp 21 or the second clamp 22. The second clamp 22 has extensions 221 on both sides, and rotating rings 222 are provided on the extensions 221. The first clamp 21 has shafts 211 on both sides. The extensions 221 are located outside the first clamp 21, and the rotating rings 222 are rotatably sleeved on the shafts 211. The transmission mechanism 5 includes a first trigger 51, a first winch 52, and a traction line 53. The winch has bearings inside to ensure smooth winding and unwinding. One end of the traction line 53 is wound around the first winch 52, and the other end of the traction line 53 is connected to the rotating ring 222 on one side. The first trigger 51 is connected to the first winch 52. A stop block 54 is provided on the gripping rod 1 below the first winch 52.

[0030] Specifically, the rotational connection between the rotating ring 222 and the shaft 211 allows the second clamp 22 to rotate relative to the first clamp 21 to clamp the down conductor. The first winch 52 can be an aluminum alloy winch, operated by rotating a trigger (or handle) to rotate and retract the traction line 53 (when the gripping lever 1 is extended or retracted). The upper end of the traction line 53 is fixedly connected to the outer side of the rotating ring 222, so that when the traction line 53 is pulled, the second clamp 22 can be rotated towards the first clamp 21 by pulling the rotating ring 222 to clamp the down conductor. In addition, a spring (not shown) can be provided between the two clamps of the conductive wire clamp 2 to push the two clamps outward, so that when the traction line 53 is pulled, the pressure of the spring overcomes the second clamp 22 and moves it closer to the first clamp 21 to clamp the down conductor.

[0031] By using stop block 54, the operator can place their right thumb on stop block 54 and use their other four fingers to grip the trigger and pull back, thus maintaining the tension of the traction cable 53 and consequently the clamping force of the second clamp 22. At this time, the left hand grips the lower end of the grip lever 1 (this is just an example; the left and right hands can be used interchangeably). In addition, multiple triggers can be arranged in a circular interval to facilitate fine-tuning with the four fingers of the right hand.

[0032] Example 3 like Figures 1-5 As shown, a take-up mechanism 6 is provided on the grip 1, and the wire 4 is wound around the take-up mechanism 6. The take-up mechanism 6 and the transmission mechanism 5 are located on both sides of the grip 1, respectively. The take-up mechanism 6 includes a second trigger 61 and a second winch 62. The wire 4 is wound around the second winch 62, and one end of the wire 4 is connected to the conductive clamp 2. The second trigger 61 is connected to the second winch 62.

[0033] Specifically, a stud and a lock nut can be installed at the connection between the upper end of the conductor 4 and the conductive clamp 2 to lock the upper end of the conductor 4, so that the conductor 4 can be disassembled and replaced. The second winch 62 can be an aluminum alloy winch, which is operated by rotating a trigger (or handle) to rotate and (when the gripping rod 1 is extended or retracted) the conductor 4.

[0034] Example 4 like Figures 1-4 As shown, the top of the gripping rod 1 is hinged to the conductive wire clamp 2, and a locking element 7 is provided at the hinge. The rotation direction at the hinge is the same as the transmission direction of the transmission mechanism 5.

[0035] Specifically, a connecting seat is provided at the lower end of the conductive clamp 2 (first clamp 21), and a connecting seat is provided at the upper end of the holding rod 1. The two connecting seats are connected by bolts and locked with a wing nut on one side as a locking element 7. After releasing the wing nut, the angle of the conductive clamp 2 relative to the holding rod 1 can be adjusted so that the operator can contact the down conductor at different angles. Alternatively, if one swing of the holding rod 1 is insufficient to remove rust from the surface of the down conductor, the angle of the conductive clamp 2 can be readjusted to allow the conductive clamp 2 to contact and remove rust from other radial areas of the down conductor.

[0036] How this utility model is used: The operator pulls the telescopic gripping rod 1 to the desired length, releasing the traction line 53 of the first winch 52 and the conductor 4 of the second winch 62 according to the extension length of the gripping rod 1. The conductive clamp 2 is extended to the down conductor position, positioning the down conductor between the two clamps of the conductive clamp 2. Then, the operator squeezes the first trigger 51, tightening the traction line 53 to rotate the second clamp 22 and clamp the down conductor with the first clamp 21. The operator then swings / rotates the gripping rod 1 up and down, causing the filing structure 3 to rotate and file away the rust layer on the down conductor surface. Afterwards, the operator connects the end of the conductor 4 to a grounding resistance tester on the ground to measure the grounding resistance. After the measurement is completed, the operator releases the trigger, the conductive clamp 2 returns to its original position away from the down conductor, and the operator manually rotates the trigger to rewind the traction line 53 and the conductor 4, causing the gripping rod 1 to retract to its initial state.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings, characterized in that, include: A gripping rod and a conductive wire clamp, the conductive wire clamp being connected to the upper end of the gripping rod for clamping the downlead wire; A file-shaped structure is provided on the inner side of the conductive wire clamp for holding the down conductor; A wire, which is connected to the conductive clamp.

2. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 1, characterized in that, It also includes a transmission mechanism, wherein the conductive wire clamp includes a hinged first clamp and a second clamp, and the transmission mechanism is connected to the first clamp or the second clamp.

3. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 2, characterized in that, The second clamp has extensions on both sides, and each extension has a rotating ring. The first chuck has shafts on both sides; The extension is located outside the first clamp, and the rotating ring is rotatably sleeved on the shaft.

4. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 3, characterized in that, The transmission mechanism includes a first trigger, a first winch, and a traction line. One end of the traction line is wound around the first winch, and the other end of the traction line is connected to the rotating ring on one side. The first trigger is connected to the first winch.

5. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 4, characterized in that, The gripping rod is provided with a stop block located on the lower side of the first winch.

6. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 2, characterized in that, The grip rod is equipped with a take-up mechanism, and the wire is wound around the take-up mechanism.

7. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 6, characterized in that, The take-up mechanism and the transmission mechanism are located on both sides of the grip rod, respectively.

8. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 7, characterized in that, The take-up mechanism includes a second trigger and a second winch. The wire is wound around the second winch, and one end of the wire is connected to the conductive clamp. The second trigger is connected to the second winch.

9. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 2, characterized in that, The grip rod is a multi-stage telescopic rod.

10. The auxiliary device for measuring grounding resistance in lightning protection testing of ancient buildings according to claim 9, characterized in that, The top of the gripping rod is hinged to the conductive wire clamp, and a locking element is provided at the hinge. The rotation direction at the hinge is the same as the transmission direction of the transmission mechanism.

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