Roller with grooves for overhead line inspection and self-propelled inspection device equipped with the same

Abstract

To provide a roller having grooves for overhead line inspection, capable of reliably climbing over large obstacles such as anti-twist dampers D1, double torsional dampers, and Christmas tree-type dampers arranged on overhead lines such as electric wires with a steep gradient (approximately 30 degrees), and a self-propelled inspection device equipped with the roller. [Solution] The V-groove roller has at least one pair of elastic convex material portions 2 arranged opposite the V-groove in which overhead wires W such as electric wires are arranged, and the convex portions of the elastic convex material act as locking members that serve as footholds for climbing over obstacles, and also exert elastic force to facilitate climbing over large obstacles such as anti-torsion dampers D1, double torsional dampers, and Christmas tree-type dampers.

Description

[Technical Field]

[0001] The present invention relates to a roller having grooves for overhead line inspection, which is used in an overhead line inspection device that inspects overhead lines such as electric wires while traveling over them, and to a self-propelled inspection device equipped with the roller. [Background technology]

[0002] Overhead lines, such as electric wires and transmission lines, require periodic inspection due to external damage and internal corrosion caused by aging. While inspections of such power lines have traditionally been performed by personnel standing on the lines, such manual inspections are dangerous and require the temporary suspension of power transmission. For these reasons, a self-propelled electric wire inspection device that inspects the condition of power lines while traveling on them has been developed (see, for example, Patent Document 1). The electric wire inspection device of Patent Document 1 includes traveling wheels that ride on the overhead wires and an electric wire inspection unit that detects abnormalities, such as damage to the wires. The device automatically adjusts its balance while traveling to inspect overhead wires, such as electric wires. While an embodiment suspended on an overhead wire installed between steel towers has been disclosed, the application of the overhead line inspection device of the present invention is not limited to overhead wires. The overhead line inspection device of the present invention can be applied, for example, to an OPGW (overhead power grid) installed between steel towers, or to overhead wires installed above railway tracks (see FIG. 8). Patent Document 2 discloses "an overhead wire inspection device comprising: a pair of spaced drive means arranged above an overhead wire; one or more motors for driving the drive means; and a frame that rotatably supports the pair of drive means on top, the drive means being attached to the outer periphery of a rigid rim and having an annular rubber tire with a groove formed by a gentle hyperbolic curve on its outer periphery that can overcome torsion prevention dampers or snow-resistant rings provided on the overhead wire, the rubber tire extending in a direction that diagonally intersects with the extension direction of the overhead wire, and having a series of V-shaped band-like uneven portions on its outer periphery that form a vertex from the outer edge toward the center" (Claim 1) (Fig. 9). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-79018 [Patent Document 2] Patent No. 6000109 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, obstacles D on overhead lines such as electric wires include snow-resistant rings D2 and armor rods D3, but the largest obstacles are torsion prevention dampers D1, double torsional dampers D4, and Christmas tree-shaped dampers D5. However, with the above-mentioned conventional V-shaped groove rollers, although they can run without any problems on overhead transmission lines W with parallel wiring or on gently inclined wiring, when there is a wiring section with a steep inclination angle or a large obstacle such as a twist prevention damper D1, they cannot get over this large obstacle even when in a nearly balanced state. The applicant of the present application experimentally produced a comparative example equivalent to the V-grooved roller disclosed in Patent Document 2 (FIG. 10 is a V-grooved roller simulating the V-grooved roller disclosed in Patent Publication No. 6000109), and conducted an operation confirmation test when there was a large obstacle such as an anti-twist damper D1 on parallel wiring. When there was a large obstacle such as an anti-twist damper D1 on parallel wiring, it was confirmed that conventional products were not only unable to overcome the large obstacle such as the anti-twist damper D1 on parallel wiring (it was also impossible to overcome due to the shape (FIG. 5(a))), but also unable to overcome a large obstacle such as the anti-twist damper D1 even at a slight inclination angle. Furthermore, no dampers capable of overcoming large obstacles D such as double torsional dampers (products that suppress breeze vibrations that occur in power transmission lines) D4 or Christmas tree-shaped dampers (products used in special spans such as areas with strong winds or long spans) D5 had been developed (FIG. 5(b)). Therefore, the object of the present invention is to provide a roller having grooves for overhead line inspection that can reliably overcome even large obstacles such as anti-twist dampers D1, double torsional dampers D4, and Christmas tree-type dampers D5 arranged on overhead lines such as electric wires with steep gradients (approximately 30 degrees), and a self-propelled inspection device equipped with the roller. [Means for solving the problem]

[0005] The present invention relates to a grooved roller for overhead line inspection, such as a V-shaped grooved roller or U-shaped grooved roller, which is mounted on an inspection device that inspects overhead lines such as electric wires and is used to overcome obstacles such as anti-torsion dampers.The grooved roller for overhead line inspection is characterized in that it has at least a pair of elastic convex material portions that are arranged opposite the V-shaped groove in which the overhead line is placed, and the convex portions of the elastic convex material serve as a foothold for the overtaking operation, and exerts elastic force to deform while adapting to the shape of obstacles such as large obstacles D such as anti-torsion dampers, double torsional dampers (products that suppress breeze vibrations that occur in power transmission lines), and Christmas tree-type dampers (products used in special spans such as in strong wind areas and on long spans) D5. According to the present invention, when the elastic convex member comes into contact with an obstacle such as an overhead line damper, the convex portion of the elastic convex member acts as a foothold to engage over the obstacle and repeats the action of returning to its original state (repeated engagement in the concave and convex state), so that even on steep slopes with large inclination angles, it is possible to overcome obstacles such as anti-twist dampers in a balanced and reliable manner. The elastic convex member also serves to position the overhead line such as an electric wire at the upper tip side of the V-shaped or U-shaped groove and prevent it from coming out of that position.

[0006] The elastic convex material is a hollow member with a hollow interior that is positioned to protrude into the V-shaped groove or U-shaped groove of the V-shaped roller, and is characterized in that when it comes into contact with an obstacle such as a torsion prevention damper, double torsion damper, or Christmas tree-type damper, it deforms to accommodate the shape of the obstacle and engages with it. According to the present invention, the elastic convex material is a hollow member with a hollow interior, and therefore the elasticity of the material reliably repeats the engagement of the concave and convex state, so that the material can reliably overcome large obstacles such as anti-torsion dampers, double torsional dampers, and Christmas tree-type dampers, even on steep slopes with large inclination angles.

[0007] The V-shaped grooves and U-shaped grooves are made of hard urethane, and the elastic convex members are made of a synthetic resin or rubber that is softer than the hard urethane. While overhead wires such as electric wires are often made of metal, even if they have snow-resistant rings or arm rods around their outer peripheries, these rings still serve to prevent wear on the V-shaped grooves and U-shaped grooves. According to the present invention, the elastic convex member is made of a synthetic resin or rubber which is softer than the hard urethane, so that the elasticity ensures that the uneven state is repeatedly retained, and therefore the device can reliably overcome obstacles such as anti-twist dampers even on steep slopes with large inclination angles.

[0008] The present invention is characterized in that the elastic convex members protrude in a D-shape at a height that is parallel to the V-shaped groove of the V-shaped groove roller or the U-shaped groove of the U-shaped groove roller, and are provided opposite each other at predetermined intervals of 90 degrees, 60 degrees, or 30 degrees. According to the present invention, even if an obstacle such as an anti-twist damper with an irregular shape is involved, it is easy to get into the above-mentioned uneven state of engagement (a state in which it can be used as a foothold) from its outer periphery, and even if it is a snow-resistant ring or an armor rod, it is easy to get into the above-mentioned uneven state of engagement from its outer periphery. Furthermore, when inserting overhead wires such as electric wires, it is possible to prevent them from coming off the tip of the V-shaped groove, regardless of whether the diameter is large or small.

[0009] The present invention is characterized by a self-propelled inspection device equipped with a roller having grooves for overhead wire inspection, and equipped with a speed adjustment mechanism for adjusting the traveling speed. According to the present invention, the speed of the elastic convex material can be adjusted when it comes into contact with an obstacle such as a torsion prevention damper, so that the self-propelled inspection device can run stably regardless of the shape or size of the device or even when it is affected by wind, etc. [Effects of the Invention]

[0010] According to the present invention, when an overhead wire such as an electric wire passes through the inside of a V-shaped or U-shaped groove, the roller with grooves for overhead wire inspection uses the convex portion as a foothold to overcome obstacles such as anti-twist dampers while maintaining good balance, and deforms by elastic force to conform to the shape of the obstacle, returning to its original state after overcoming the obstacle. The elastic convex portion also serves to prevent the overhead wire from jumping out of the upper end of the V-shaped or U-shaped groove. In other words, it also has the effect of preventing the overhead wire, such as an electric wire, from coming off the end of the V-shaped groove when inserted, regardless of whether the diameter is large or small. [Brief explanation of the drawings]

[0011] [Figure 1a] 10A and 10B are diagrams showing the configuration of an elastic convex member attached to a roller having a groove such as a V-shaped or U-shaped groove, used in an overhead line inspection device according to one embodiment of the present invention. [Figure 1b] 10A and 10B are diagrams showing the configuration of an elastic convex member attached to a roller having a groove such as a V-shaped or U-shaped groove, used in an overhead line inspection device according to one embodiment of the present invention. [Figure 1c] 10A and 10B are diagrams showing the configuration of an elastic convex member attached to a roller having a groove such as a V-shaped or U-shaped groove, used in an overhead line inspection device according to one embodiment of the present invention. [Figure 1d] 10A and 10B are diagrams showing the configuration of an elastic convex member attached to a roller having a groove such as a V-shaped or U-shaped groove, used in an overhead line inspection device according to one embodiment of the present invention. [Figure 1e]10A and 10B are diagrams showing the configuration of an elastic convex member attached to a roller having a groove such as a V-shaped or U-shaped groove, used in an overhead line inspection device according to one embodiment of the present invention. [Figure 2] FIG. 10 is a perspective view showing a V-grooved roller that rides over the anti-twist roller according to the embodiment. [Figure 3] FIG. 2 is a front view showing the configuration of the overhead wire inspection device according to the embodiment. [Figure 4] FIG. 2 is a perspective view showing the configuration of the overhead wire inspection device according to the embodiment. [Figure 5a] FIG. 10 is a diagram illustrating an experiment using an experimental device to determine whether the overhead wire inspection device according to the embodiment can reliably overcome large obstacles even at locations with steep gradients with large inclination angles. [Figure 5b] 1 is a longitudinal cross-sectional view of a driving means provided in the overhead wire inspection device according to the embodiment, and shows the state in which a twist prevention damper and a snow-resistant ring are attached to the overhead wire. FIG. [Figure 6a] FIG. 10 is a diagram illustrating a control unit of the overhead line inspection device according to the present invention. [Figure 6b] FIG. 10 is a diagram illustrating a control unit of the overhead line inspection device according to the present invention. [Figure 7a] FIG. 10 is a side view illustrating an example of a Christmas tree type damper. [Figure 7b] FIG. 10 is a side view illustrating an example of a Christmas tree type damper. [Figure 8] FIG. 10 is a perspective view illustrating an example of a conventional V-grooved roller. [Figure 9a] FIG. 1 is a perspective view illustrating a conventional V-grooved roller and an overhead wire inspection device. [Figure 9b] FIG. 1 is a perspective view illustrating a conventional V-grooved roller and an overhead wire inspection device. [Figure 10] FIG. 1 is a diagram illustrating a prototype of a V-grooved roller that is based on the V-grooved roller described in Japanese Patent No. 6000109, a conventional example. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. An example in which the present invention is applied by being attached to an overhead wire inspection device according to one embodiment of the present invention will be described. In addition, although an example in which a V-grooved roller is used will be described, the present invention can also be applied to rollers having grooves such as a U-grooved roller.

[0013] The overhead line inspection device 10 of this embodiment includes a V-shaped groove roller 1 that is installed on a power transmission line and travels on the power transmission line, and a housing-shaped self-propelled overhead line inspection device 11. The V-shaped groove roller 11 is disposed inside a housing 12, and includes a photographing unit 13, a control unit (controller) 14, an illumination unit, etc. The overhead line inspection device 10 also includes a motor that drives a pair of spaced-apart drive means 8, and the pair of drive means 8 is disposed above the overhead line W. A battery is connected to the motor via wiring (not shown) to supply power to the motor. The imaging means 13 captures images of the appearance of the overhead line W, such as an electric wire, and detects whether the elastic convex member 2 or the elastic convex member 2 has come into contact with a large obstacle D, such as a torsion damper D1, and sends the captured images to the control unit 14. When the pair of motors 16m are synchronously rotated in one direction, the pair of drive means 8 rotate, allowing the overhead line inspection device 10 to move along the power transmission line W. When the pair of motors 16m are synchronously rotated in the other direction, the drive means 8 rotates, allowing the overhead line inspection device 10 to travel along the power transmission line W (FIG. 4). The control unit 14 includes a speed adjustment function 19 that adjusts the traveling speed when the robot comes into contact with a large obstacle D such as a twist prevention damper D1, a communication unit 20, and an electric wire inspection unit 6 (FIGS. 6(a) and 6(b)). The control device (PC controller) 14 is communicatively connected to the housing-shaped self-propelled inspection device 11 and the photographing unit 130 via a wired or wireless communication circuit, and controls the operation of the self-propelled inspection device 11 and the photographing unit 130 (Figures 4(a) and (b). The controller (control unit) 14 is, for example, a small general-purpose computer (for example, a single-board computer). The control unit 14 is equipped with a motor control unit that controls the operation of the motor 16m and a camera control unit 17 that controls the operation of the imaging means. The battery is electrically connected to the housing-shaped self-propelled inspection device 10 and the photographing means 21 via a cable or the like, and supplies power to the housing-shaped self-propelled overhead line inspection device 10 and the photographing means 21. The device also includes a traveling drive unit 8, a wireless transceiver unit 16, and a control unit 9, and the microcomputer 9 of the control unit 14 controls the motor drive circuit to operate the traveling motor (drive means) 8.

[0014] The overhead line inspection device 10 also has left and right gaps 15b, 15b on the left and right sides where the V-shaped groove roller 1 is attached, as well as a large gap 15a below where the V-shaped groove roller 1 is attached. The left and right gaps 15b, 15b are larger than those of conventional products to allow for the passage of electric wires that extend in the left and right directions through a double torsional damper (a product that suppresses breeze vibrations that occur in power transmission lines) D4 and a Christmas tree-type damper (a product used in special spans such as in strong wind areas and long spans) D5 (FIG. 6(b)). The larger gap 15a below where the V-shaped groove roller 1 is attached is larger than that of conventional products to allow for the passage of electric wires that extend in the up and down directions through a Christmas tree-type damper (a product used in special spans such as in strong wind areas and long spans) D5 (FIG. 6(a)).

[0015] (First embodiment: configuration of V-grooved roller 1) The V-grooved roller 1 has a V-shaped roller 3 on which an elastic convex member 2 is attached (FIGS. 1 and 2). The elastic convex member 2 can be attached to and detached from the V-shaped roller 3 by two screws. The elastic convex member 2 has a length of 30 mm, a width of 21 mm, and a height of 14 mm, and is D-shaped (solid), with a hollow interior, and its surface 2b is substantially hemispherical (D-shaped).

[0016] The elastic convex members 2 are arranged facing each other at 90-degree intervals on the circumference. The intervals may be every 90 degrees, 60 degrees, or 30 degrees. However, this is not limited to this, and they may be arranged over the entire V-shaped groove 1a of the V-shaped groove roller 1. In either case, when they come into contact with an obstacle such as a torsion prevention damper D1 or a snow-resistant ring D2, they are crushed and deformed to provide a foothold for overcoming the obstacles D1 to D3, and their elasticity allows them to repeatedly change shape and overcome even an obstacle D with a steep incline angle of about 30 degrees (Fig. 5).

[0017] The V-grooved roller 1 has elastic convex members 2 attached to a V-shaped groove 1a. The inclination angle of this V-shaped groove 1a is set to 50 degrees, and the elastic convex members 2 are attached above the V-shaped groove 1a with their height parallel to the height of the elastic convex members 2. The elastic convex members 2 are made of synthetic resin or rubber and have a hemispherical shape (D-shaped on the surface) 2b with a hollow interior 2a. The V-grooved roller 1 made of hard urethane has a pair of elastic convex members 2 arranged on the left and right, spaced apart at 90-degree intervals on the circumference. Therefore, when an obstacle D such as a torsion damper comes into contact with the elastic convex member 2, the hollow interior thereof engages (gripping) in a balanced manner, serving as a foothold (engaging member) for the obstacle D, enabling the obstacle D to be overcome reliably and easily, and after the obstacle D has been overcome, the elastic convex member 2 returns to its original D-shape (Fig. 1(a)). Furthermore, by returning to the original state, the overhead wire W such as an electric wire is prevented from coming out of the V-shaped groove 1a. The elastic convex member 2 is made of hard urethane so that the overhead wire W such as an electric wire will not be worn out even if it comes into contact with the hard urethane when the elastic convex member 2 comes into contact with the elastic convex member 2. Furthermore, the imaging means 21 is provided with a speed adjustment function 19 that adjusts the traveling speed of the control unit 14 while displaying the state when it comes into contact with an obstacle D such as a twist prevention damper D1 (FIG. 6). This is to adjust the speed because when the elastic convex member 2 comes into contact with the obstacle D, it also affects the V-shaped groove roller 1 when it tilts or when its speed changes. Normally, the speed is adjusted to decelerate when the elastic convex member 2 comes into contact with the obstacle D. Then, when it passes the obstacle D, it increases its speed and travels. Note that the imaging means 21 may also be used to image the position of an overhead wire W such as an electric wire, to check whether the overhead wire W is located in the tip groove of the V-shaped groove roller 1 or whether the overhead wire W is in contact with the elastic convex member 2, as desired, depending on the implementation.

[0018] An overhead line (electric wire) W is fitted with a torsion damper D1 and an armor rod D3 to protect the wire W from damage caused by snow accumulation. The torsion damper D1 has a weight that swings to counteract the vibration of the power line W caused by wind, thereby damping the vibration of the power line W.

[0019] In this embodiment, the elastic convex members 2 were manufactured in several shapes using TPU material (Examples and Comparative Examples were manufactured). TPU material is an abbreviation for thermoplastic polyurethane resin, a type of plastic that is impact-resistant and flexible. It also possesses the impact resistance and flexibility that are characteristic of polyurethane. First, a D-shaped sponge (solid product) was created, but while it was easy to climb over, the corners cracked, making it less durable. The D-shaped sponge has the advantage of being flexible, making it easy to climb over, but the disadvantage is that the material is too soft and it cracks easily. The square sponge shape is durable in terms of its shape, but the sponge material lacks durability. The D-shaped rubber (solid product) has low flexibility, so it does not grip (lock) and cannot climb over steep slopes. However, because it is a solid product, it is highly durable. From these results, it can be seen that the highly durable D-shaped rubber exhibits moderate elasticity due to the hollow shape 2a, and is therefore excellent in terms of performance in climbing over large obstacles D. In addition, in relation to the hard urethane V-shaped groove roller 1, softer synthetic resin is also preferred as a material for the elastic convex member 2, as the D-shape (almost hemispherical shape) of the hollow 2a is easily crushed and exhibits excellent elasticity.

[0020] (experiment) An experiment was conducted using an experimental device 15A using a V-grooved roller 1 with a D-shaped hollow portion 2a, in which an overhead wire W such as an electric cable with a large inclination angle was placed at approximately 30 degrees, and obstacles D such as a torsion damper, a snow-resistant ring 7, and an armor rod D3 were placed on the overhead wire W (FIG. 5(a)). An experiment was then conducted on the self-propelled inspection means 10 of the embodiment to determine whether the frictional resistance of the tread surface could be improved and whether the torsion damper D1 and the snow-resistant ring 7 could easily overcome the obstacles D (FIG. 1(a)). Here, the torsion damper D1 has a central protrusion D1a and weights on the left and right, and may be placed on the armor rod D3, and its size is the largest obstacle D (FIG. 5(a)). In this regard, a comparative example equivalent to the V-shaped groove roller according to Patent Document 2 was experimentally produced (FIG. 10 is a V-shaped groove roller simulating the V-shaped groove roller described in Japanese Patent No. 6000109), and an operation confirmation test was conducted when there was a large obstacle such as an anti-twist damper D1 in parallel wiring. When there was a large obstacle such as an anti-twist damper D1 in a state where the electric wires were arranged in a parallel state, the conventional product was unable to overcome this large obstacle (it was also impossible to overcome due to its shape; FIG. 5(a)). In other words, a V-shaped groove roller simulating the V-shaped groove roller described in Japanese Patent No. 6000109 was unable to overcome the portion D1a that supports the weight, but in the V-shaped groove roller 1 of this embodiment, the elastic convex members 2 are arranged at equal intervals, so even an anti-twist damper D1 with a distorted diameter can overcome the portion D1a that supports the weight. In addition, an experiment was conducted using experimental device 15B to determine whether a large obstacle D, such as a double torsional damper (a product that suppresses breeze vibrations that occur in transmission lines) D4 or a Christmas tree-type damper (a product used in special spans such as in areas with strong winds or long spans) D5, could be overcome (FIGS. 5(b)(c)). Here, the Christmas tree-type damper D5 has wires arranged so that they are spread out in the vertical direction and on the left and right sides. However, other than this, the configuration is the same as that of anti-torsion damper D1. Therefore, according to this embodiment, it can be used even with an inclination angle Cd of approximately 30 degrees, just like anti-torsion damper D1. In addition, an experiment was also conducted to determine whether the elastic convex members 2 could be arranged opposite each other at a predetermined distance inside the V-shaped groove, with a predetermined distance between them and the non-opposing gap portion, and whether they could be arranged above the V-shaped members so as not to come into contact with the overhead wire arranged at the tip of the V-shaped groove. As a result, it was found that even when colliding with a large obstacle D such as a torsion prevention damper D1 at a steep gradient with a slope angle Cd of approximately 30 degrees, the elastic convex material 2 can use the obstacle as a foothold to climb up in a balanced and reliable manner (Figures 5(a) and 5(b)).

[0021] The elastic convex members 12 are D-shaped (solid) with a hollow interior, and their surfaces are approximately hemispherical (D-shaped). The elastic convex members 12 are arranged facing each other at intervals of 30 degrees, but can also be arranged at intervals of 60 degrees, 30 degrees, etc. Even if an obstacle D exists in the wiring of the power transmission line (overhead line) W, it can overcome even an obstacle D with a large steep gradient of about 30 degrees with a large inclination angle Cd, as in the first embodiment.

[0022] In the above, in this embodiment, the type of damper that can be overcome has mainly been explained as an anti-torsion damper (a product that prevents twisting of the wire due to snow accretion that rotates and grows along the outer layer twist of the wire, and prevents heavy snow accretion in advance), but it can also be applied to other large obstacles D such as a double torsional damper (a product that suppresses light breeze vibrations that occur in transmission lines) D4 and a Christmas tree type damper (a product with the same basic operating principle as a double torsional damper but superior characteristics to a double torsional damper, used in special spans such as in areas with strong winds or long spans) D5. Also, although an example using a V-shaped grooved roller 1 has been explained, it can also be applied to rollers with grooves such as a U-shaped groove of a U-shaped grooved roller. [Explanation of symbols]

[0023] 1. Rollers with grooves for overhead line inspection (grooved rollers such as V-shaped and U-shaped grooved rollers), 1a V-shaped groove, 2 Elastic convex member, 2a Hollow portion, 2b Surface (almost hemispherical surface, D-shaped surface), 3 V-shaped grooves and U-shaped grooves, 8 drive means, 10 Self-propelled inspection equipment, 13 imaging means, 14 Control means; 15a: large gap, 15b: left and right gaps, 16A, 16B Experimental equipment, Cd tilt angle, D Large obstacle, D1 Anti-torsion damper, D2 Snow-resistant ring, D3 Armor rod, D4 double torsional damper, D5 Christmas tree type damper, W Electric wire (overhead line), power transmission line (overhead line)

Claims

1. A roller with V-shaped or U-shaped grooves for overhead line inspection, used in an overhead line inspection device that inspects overhead lines while running over them, is provided with an elastic convex member that is placed opposite the V-shaped or U-shaped groove for overhead line inspection in which the overhead line is placed, the roller is made of hard urethane, the elastic convex member is made of a synthetic resin or rubber that is softer than the hard urethane, and the convex portion of the elastic convex member serves as an engaging member that serves as a foothold for climbing over obstacles, and exerts elastic force to climb over obstacles such as anti-torsion dampers, double torsional dampers, and Christmas tree-type dampers.

2. A roller with V-shaped or U-shaped grooves for overhead line inspection, used in an overhead line inspection device that inspects overhead lines while running over them, is provided with an elastic convex member that is arranged opposite the V-shaped or U-shaped groove for overhead line inspection in which the overhead line is placed, the elastic convex member being a hollow member that is arranged to protrude into the V-shaped or U-shaped groove for overhead line inspection, and when it comes into contact with an obstacle such as a torsion prevention damper, double torsion damper or Christmas tree-type damper, the hollow member collapses and becomes an engaging member that acts as a foothold for climbing over the obstacle, and also exerts elastic force to climb over the obstacle.

3. The elastic convex members are arranged in pairs facing the V-shaped or U-shaped groove for overhead line inspection, and the roller with V-shaped or U-shaped groove for overhead line inspection is made of hard urethane, and the elastic convex members are made of a synthetic resin or rubber that is softer than the hard urethane.

4. A roller with grooves for overhead line inspection as described in claim 1 or 2, characterized in that the elastic convex member protrudes convexly at a height that is parallel to the V-shaped or U-shaped groove for overhead line inspection and is arranged opposite to it at a predetermined interval of approximately 90 degrees.

5. A roller with grooves for overhead line inspection as described in claim 1 or 2, characterized in that the elastic convex members protrude in a D-shape to a height that makes them parallel to the V-shaped or U-shaped groove for overhead line inspection, and are arranged opposite each other at a predetermined interval of 90 degrees, 60 degrees, or 30 degrees.

6. A self-propelled inspection device equipped with a roller having grooves for overhead wire inspection as described in claim 1 or 2, characterized in that the imaging means images or has a speed adjustment function that adjusts the running speed when it comes into contact with an obstacle such as an anti-torsion damper, double torsion damper, or Christmas tree-type damper, or the speed adjustment function adjusts the speed while the imaging means images the state in which the elastic convex member is climbing over an obstacle such as an anti-torsion damper, double torsion damper, or Christmas tree-type damper.

7. A self-propelled inspection device equipped with a roller having a groove for overhead line inspection as described in claim 1 or 2, characterized in that left and right gaps that allow passage through obstacles such as double torsional dampers or Christmas tree-type dampers (wires that extend left and right in the case of Christmas tree-type dampers) are formed on the left and right sides of the roller having the groove, or a gap that allows passage through obstacles such as Christmas tree-type dampers (wires that extend up and down in the case of Christmas tree-type dampers) is formed below the roller having the groove.

Images