JP2018090990A - Cable inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable inspection device capable of preventing rotation around an inspection device cable and of preventing a decrease in inspection accuracy.SOLUTION: A cable inspection device 1 comprises: a frame 2 which can be moved along a cable 15 and on which a camera 6 is installed for taking photographs of the cable 15; a plurality of wheels 8 that make contact with the cable 15 and rotate; and a connector 4 which connects the frame 2 to a multicopter 3. The connector 4 connects the frame 2 to the multicopter 3 such that it allows the frame 2 to be rotated in a rotational plane that is perpendicular to the horizontal reference plane of the multicopter 3 while also not allowing rotation outside of the rotational plane. The multicopter 3 is autonomously arranged directly above the cable 15 by the regulating action of the connector 4, while the posture of the multicopter 3 is controlled such that it is autonomously kept horizontal when the multicopter 3 is flown above the cable 15. The frame 2, driven by the multicopter 3 which is flown directly above the cable 15, prevents rotation around the cable 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cable inspection device for inspecting a cable of, for example, a cable-stayed bridge.

  Cable stays are regularly managed on cable-stayed bridges and Nielsen Rose bridges because the main loads are supported by cables. In cable maintenance management, visual inspection is performed to observe whether there are any abnormalities such as cracks or peeling in the coating film of the cable. Traditionally, visual inspection of cables has been carried out by an inspector getting on a gondola hung on the cable, and the inspector approaching the cable, but it is dangerous for the inspector to approach the cable at a high place. There was an inconvenience.

  Therefore, conventionally, in order to inspect the cable, an inspection device such as a camera that photographs the cable instead of visual observation is mounted on the apparatus body that runs along the cable, and the cable is inspected by remote operation using wireless communication. A self-propelled cable inspection device has been proposed (see, for example, Patent Document 1). However, since this self-propelled cable inspection device includes a drive device such as a battery, a motor, and a transmission gear in the device main body, the mass is relatively large, and there is a problem that it takes time to install the cable. In addition, some recent bridge cables have parallel projections on the surface in order to prevent the rain vibration phenomenon that causes vibrations during heavy winds, but by running a cable inspection device with a large mass, There is a risk of damaging the protrusion.

  As a cable inspection device capable of solving such inconvenience, a helicopter type cable inspection device configured to suspend and move a main body movable along a cable with a wireless helicopter has been proposed ( For example, see Patent Document 2). FIG. 11 is a diagram showing the conventional helicopter type cable inspection device. The cable inspection device 115 includes an inspection vehicle 116 that is movably mounted on the cable 113 and a wireless helicopter 117 that moves the inspection vehicle 116 in a suspended state. The inspection vehicle 116 includes a frame 121 that surrounds the cable 113, a plurality of wheels 118 a to 118 e that are attached along the circumferential direction of the frame 121, and a camera 125 that images the surface of the cable 113. The frame 121 includes a plurality of rotating shafts 127 that rotatably support the wheels 118a to 118e, and a connecting member 128 that connects the rotating shafts 127 to each other. The connecting member 128 is connected in a chain shape, and has a function of adjusting the contact positions of the wheels 118a to 118e according to the diameter and the inclination angle of the cable 113.

  The inspection vehicle 116 is suspended by a link mechanism 122 that is rotatably connected to the radio helicopter 117. The link mechanism 122 includes a main shaft 123 extending from the radio helicopter 117 toward the frame 121 of the inspection vehicle 116, and an adjustment shaft 124 that adjusts the connection angle with the inspection vehicle 116 according to the flight angle of the radio helicopter 117. The link mechanism 122 allows the wireless helicopter 117 to change the angle with respect to the inspection vehicle 116 and to rotate, and the freedom of movement in a predetermined direction with respect to the inspection vehicle 116 is not limited. It is possible to fly at a degree.

  The radio helicopter 117 is caused to fly along the cable 113 when an operator operates a controller to which an operation signal is transmitted by wireless communication. Alternatively, the radio helicopter 117 registers in advance a flight path in consideration of the inclination and length of the cable 113 in a control unit having a position detection function using GPS (Global Positioning System). To fly along the cable 113. When the radio helicopter 117 flies along the cable 113, the flight attitude of the radio helicopter 117 is appropriately changed according to the angle of the cable 113 and the presence or absence of surrounding obstacles. At this time, since the radio helicopter 117 is connected to the inspection vehicle 116 by the link mechanism 122, the radio helicopter 117 can fly at a position shifted to the left and right from the cable 113.

JP2013-245496A JP, 2006-56622, A

  However, in the conventional helicopter type cable inspection device, the wireless helicopter 117 is connected to the inspection vehicle 116 so that the angle can be changed and rotated by the link mechanism 122. There is an inconvenience that the surrounding posture becomes unstable. Specifically, as shown in FIG. 13, when the radio helicopter 117 flies along the cable 113, if it tries to move in the direction perpendicular to the axis of the cable 113 as indicated by the arrow M, the link mechanism 122 causes the As shown by 14 arrow R1, it rotates clockwise around the cable 113. As a result, the inspection vehicle 116 rotates clockwise around the cable 113 as indicated by an arrow R2. When the inspection wheel 116 rotates around the cable 113 in this way, the shooting direction of the camera 125 changes, so that the camera 125 takes a position that deviates from the position where the cable 113 should be shot, and the inspection accuracy decreases. Will be invited.

  Such rotation of the inspection vehicle 116 around the cable 113 can be prevented by the radio helicopter 117 always flying directly above the cable 113 in the vertical direction. However, when the operator operates through the controller, it is practically impossible for the radio helicopter 117 to always fly directly above the cable 113 because the operator is located away from the radio helicopter 117. Further, when the flight path is registered in advance in the wireless helicopter 117, the flight position is affected by GPS position detection error, the influence of wind, and the like, so it is difficult to always fly the wireless helicopter 117 directly above the cable 113.

  Accordingly, an object of the present invention is to provide a cable inspection device that can prevent rotation of the inspection device around the cable and prevent a decrease in inspection accuracy in the cable inspection device that moves the main body on which the inspection device is mounted with the flying object. There is.

In order to solve the above problems, a cable inspection device of the present invention is arranged so as to surround a cable to be inspected, and a frame on which inspection equipment for performing inspection is mounted;
At least one pair of wheels mounted opposite the frame and rotating against the cable;
The frame is connected to one end, and the flying body is connected to the other end so that the frame can be rotated in a rotating plane perpendicular to the horizontal reference plane of the flying object, and the rotating surface It is characterized by comprising a connection body that is connected so as not to rotate outside.

  According to the said structure, the inspection apparatus which performs inspection of a cable is mounted in the flame | frame arrange | positioned so that the cable of inspection object may be surrounded. At least one pair of wheels rotating against the cable are mounted opposite the frame. A flying body that moves the frame is connected to the frame by a connecting body. The connecting body has a frame connected to one end and a flying body connected to the other end, and the frame can be rotated in a rotating plane perpendicular to the horizontal reference plane of the flying body, and The non-rotating connection is made outside the rotating surface. When the cable is arranged at an angle with respect to the horizontal plane, when the flying object flies along the cable, the driving force of the flying object acts on the frame via the connecting body, and the wheels in contact with the cable rotate. While the frame moves along the cable. Here, if the attitude of the flying object is maintained so that the horizontal reference plane of the flying object faces the horizontal direction above the cable, the turning plane on which the frame is turned by the connecting body is the horizontal reference plane of the flying object. Since it forms a right angle to it, it faces in the vertical direction. Therefore, the frame is located below the plane of rotation that faces the vertical direction from the flying object. As a result, the cable surrounded by the frame is positioned below the flying body along the rotation surface. In this way, if the attitude of the flying object is controlled horizontally, the connecting body is connected to the frame so that the frame can rotate within the rotation surface and cannot rotate outside the rotation surface. The position of the flying body is autonomously arranged above the vertical direction of the cable. Therefore, if the flying object flies substantially above the cable, the flying object is arranged directly above the cable by the regulating action of the connecting body. As a result, when the operator operates the flying object via wireless communication, the flying object can be stably placed directly above the cable without performing a highly accurate operation for positioning the flying object directly above the cable. It can be made to fly to be located in. Therefore, the frame can be moved along the cable while preventing rotation around the cable. In addition, when the flight path is input to the flying object in advance to fly autonomously, the flying object will be positioned directly above the cable due to the regulating action of the connecting object even if it is affected by position detection error or wind. Can fly to. Therefore, the frame can be moved along the cable while preventing rotation around the cable. As a result, since the inspection position of the inspection device with respect to the cable can be stably held around the cable, the inspection device can perform a stable and highly accurate inspection.

  In one embodiment of the cable inspection apparatus, one end of the connection body is connected to the frame and the connection body so that the frame and the connection body can be rotated with respect to each other in the rotation surface and are not rotatable with respect to each other outside the rotation surface. And the other end of the connecting body is connected to the flying body and the connecting body by a second hinge that can rotate within the rotating surface and cannot rotate outside the rotating surface. Connected to the flying object.

  According to the above-described embodiment, one end of the connection body can be rotated with respect to each other within a rotation plane that is perpendicular to the horizontal reference plane of the flying object and the frame and the connection body can be rotated with each other outside the rotation plane. It is connected to the frame by a first hinge that connects to it. At the same time, the other end of the connecting body is connected to the flying body by a second hinge that connects the flying body and the connecting body to each other within the rotation surface and to be non-rotatable outside the rotation surface. Has been. As a result, when the flying body flies, the connecting body connected by the first and second hinges can rotate between the frame surrounding the cable within the rotating surface and the rotating surface. It is restricted so that it cannot rotate outside. As a result, if the flying object is caused to fly substantially above the cable, the flying object can be positioned directly above the cable by the regulating action of the first and second hinges of the connecting body.

  In the cable inspection device according to an embodiment, the flying object includes an autonomous horizontal control device that autonomously holds a posture in flight horizontally.

  According to the above-described embodiment, the flying object is held directly above the cable by the regulating action of the connecting body that connects the flying object and the frame, by the autonomous horizontal control device holding the flying posture autonomously horizontally. Is located. Therefore, it is possible to move along the cable easily and with good accuracy.

  In the cable inspection device according to an embodiment, the flying object has a command response control device that controls a flight position in the air according to a forward or backward command and a lift or lower command received by wireless communication.

  According to the above embodiment, since the flying body is arranged directly above the cable by the regulating action of the connecting body that connects the flying body and the frame, the command response control device advances or retreats and ascends received by wireless communication. Alternatively, it is possible to move along the cable just above the cable only by controlling the flight position in the air in response to the lowering command. Therefore, even if the control in the direction perpendicular to the axis of the cable is not performed, it is possible to move along the cable with high accuracy by a simple operation via wireless communication. Here, regarding the cable arranged to be inclined with respect to the horizontal plane, the movement toward the upper side of the inclination is referred to as forward movement, and the movement toward the lower side of the inclination is referred to as backward movement.

  In one embodiment of the cable inspection device, the pair of wheels are attached to the frame so that when one wheel contacts the surface of the cable, the other wheel forms a gap with respect to the surface of the cable. .

  According to the above embodiment, the pair of wheels are attached to the frame so that when one wheel contacts the surface of the cable, the other wheel forms a gap with respect to the surface of the cable. When the frame is driven, only one of the pair of wheels contacts the cable according to the direction of the force acting on the frame from the flying object. Therefore, the frictional force between the cable and the wheel can be reduced, and the frame can be moved quickly with relatively little energy. Further, even if one wheel contacts the convex portion existing on the surface of the cable, there is a gap between the other wheel and the surface of the cable, so that the one wheel can get over the convex portion. Therefore, it is possible to continue the movement by rotating the surface of the cable stably without locking the wheel to the convex portion.

  In the cable inspection device according to an embodiment, the wheel is formed in a roller shape in which a rotating shaft extends in a direction orthogonal to the central axis of the frame.

  According to the above embodiment, the wheel attached to the frame and in contact with the cable is formed in a roller shape in which the rotation axis extends in a direction orthogonal to the central axis of the frame. Even if the concave portion is provided, the convex portion and the concave portion can be overcome without substantially changing the traveling direction of the wheel. Therefore, the frame can be stably moved along the cable.

  In the cable inspection device according to one embodiment, the frame is formed such that the axial dimension of the cable is larger than the dimension perpendicular to the axial direction, and on both sides in the longitudinal direction, the vertical direction and the horizontal direction in the axial view of the cable. Two pairs of wheels facing each other are arranged.

  According to the above embodiment, the frame is formed so that the axial direction of the cable is the longitudinal direction, and the two pairs of wheels are arranged on both sides of the longitudinal direction of the frame, so that the frame is provided on the surface of the cable. The wheel can be stably moved along the cable without being locked to the convex portion or the concave portion.

  In the cable inspection device according to an embodiment, the flying object has an abutting member that abuts against the cable when the flight is stopped and maintains a posture at the time of stopping.

  According to the above embodiment, when the flying object stops flying, the abutting member abuts against the cable to hold the posture, so that when the flying object stops, the flying object parts are in contact with the cable and damaged. In addition, it is possible to prevent inconvenience that an excessive load acts on the connection body connecting the frame and the flying body.

  In the cable inspection device according to an embodiment, the flying body includes a rotating wing, and is configured to maintain a posture in which the rotating wing does not contact the cable when the abutting member contacts the cable. ing.

  According to the above embodiment, when the flying object stops flying, the abutting member comes into contact with the cable, so that the rotating wing of the flying object is held in a position not in contact with the cable. It is possible to effectively prevent inconvenience of being damaged by contact.

It is a side view which shows the use condition of the cable inspection apparatus of embodiment of this invention. It is a side view which shows the cable inspection apparatus of embodiment. It is a front view which shows the cable inspection apparatus of embodiment. It is a top view which shows a part of cable inspection apparatus of embodiment. It is a front view which shows a part of cable inspection apparatus of embodiment. It is a front view which shows typically the use condition of the cable inspection apparatus of embodiment. It is a front view which shows typically the use condition of the cable inspection apparatus of embodiment. It is a side view which shows the use condition of the cable inspection apparatus of a modification. It is a front view which shows the cable inspection apparatus of a modification. It is a side view which shows the use condition of a modification. It is a side view which shows the use condition of the conventional cable inspection apparatus. It is a front view which shows the conventional cable inspection apparatus. It is a front view which shows the conventional cable inspection apparatus typically. It is a front view which shows the conventional cable inspection apparatus typically.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a side view showing a state in which a cable of a bridge is inspected by the cable inspection device of the embodiment of the present invention. FIG. 2 is a side view of the cable inspection device of the embodiment, and FIG. 3 is a front view of the cable inspection device of the embodiment. This cable inspection device inspects cables of bridges such as cable-stayed bridges and Nielsen Rose bridges, and is configured to move by being driven by a multicopter as a flying object.

  The cable inspection device 1 includes a frame 2 movable along a cable 15, a plurality of wheels 8 attached to the frame 2 and rotating in contact with the cable 15, and a connecting body that connects the frame 2 to the multicopter 3. 4 is provided.

  FIG. 4 is a plan view showing the frame 2 and the wheel 8 installed on the cable 15, and FIG. 5 is a front view showing the frame 2 and the wheel 8 installed on the cable 15. The frame 2 is formed in a rectangular parallelepiped shape having a square front surface and a rectangular side surface, and is disposed so as to surround the cable 15 with its longitudinal direction directed to the extending direction of the cable 15. The frame 2 is formed by arranging angle members on each side of a rectangular parallelepiped and fixing the end portions of the angle members to each other. On the side surface, top surface, and bottom surface of the frame 2, a plate extending in the short direction is attached between the long side angle members at the center in the longitudinal direction. A first hinge 11 connected to one end of the connection body 4 is installed on the side plate of the frame 2. The angle material and plate of any one of the side surface, the top surface, and the bottom surface of the frame 2 are formed so as to be detachable from the frame 2, and the frame 2 is attached to the cable 15 through an opening formed by detaching these angle material and plate. It is arranged or removed. A camera 6 as an inspection device is attached to an end of the frame 2 in the longitudinal direction. The camera 6 captures the cable 15 and outputs a still image or a moving image of visible light. As long as the frame 2 can be arranged so as to surround the cable 15, the front surface may be formed in a cylindrical shape having a polygonal shape or a circular shape in addition to the rectangular parallelepiped shape.

  Four wheels 8 are arranged at both ends in the longitudinal direction of the frame 2 so as to surround the cable 15. The wheel 8 has a cylindrical shape, and is disposed inside four sides forming a square of the frame 2 in parallel with each side. As a result, the wheel 8 rotates around a rotation axis extending in a direction orthogonal to the central axis extending in the longitudinal direction of the frame 2. The pair of wheels 8, 8 provided on the opposite sides of the four sides of the square of the frame 2 have a separation distance between the nearest portions of the pair of wheels 8, 8 is several millimeters to several centimeters, rather than the diameter of the cable 15. Only set larger. Thereby, when the frame 2 moves along the cable 15, only one wheel 8 of the pair of wheels 8 is formed so as to contact the surface of the cable 15. The pair of wheels 8 are formed such that at least one of the wheels 8 has a rotational axis movable in a perpendicular direction, whereby the separation distance between the pair of wheels 8 can be adjusted according to the diameter of the cable 15. Yes.

  The connecting body 4 connects the frame 2 to the multicopter 3 such that the frame 2 can be rotated within a rotation plane perpendicular to the horizontal reference plane of the multicopter 3 and cannot be rotated outside the rotation plane. ing. The connecting body 4 includes a connecting rod 10, a first hinge 11 that connects one end of the connecting rod 10 to the frame 2, and a second hinge 12 that connects the other end of the connecting rod 10 to the multicopter 3. Has been. As shown in the front view of FIG. 3, the connecting rod 10 has a U-shaped portion 10a disposed over both sides of the frame and the outside of the top surface, and a rod shape extending from the center of the U-shaped portion 10a to the multicopter 3 side. It has a portion 10b. The leading ends of the U-shaped portions 10 a of the connecting rod 10 are connected to both side surfaces of the frame 2 by two first hinges 11, respectively. The tip of the rod-shaped portion 10 b of the connecting rod 10 is connected to the lower surface of the multicopter 3 by the second hinge 12. The two first hinges 11, 11 are installed at the same position in a side view of the frame 2, and rotate the frame 2 and the connecting rod 10 around each other around a rotation axis that extends in a straight line in a direction perpendicular to the central axis of the frame 2. Connected movably.

  The rotation axes of the first hinges 11 and 11 extend in parallel with the horizontal reference plane of the multicopter 3, and the tip of the U-shaped portion 10a of the connecting rod 10 is rotated by this rotation as indicated by an arrow P1 in FIG. It is connected so as to be rotatable around an axis. Thereby, the first hinges 11 and 11 can rotate the frame 2 and the connecting rod 10 with respect to each other within a rotation plane perpendicular to the horizontal reference plane of the multicopter 3, and with each other outside the rotation plane. It is connected so that it cannot rotate. Here, the horizontal reference plane of the multicopter 3 is a plane that faces the horizontal direction when the attitude when the multicopter 3 flies is controlled horizontally. For example, the horizontal reference plane of the multicopter 3 is a plane that is parallel to a plane defined by connecting the tips of the rotary shafts of the plurality of rotor blades of the multicopter 3.

  The rotation axis of the second hinge 12 extends in parallel with the horizontal reference plane of the multicopter 3, and the tip of the rod-like portion 10b of the connecting rod 10 rotates around this rotation axis as indicated by an arrow P2 in FIG. Connected movably. As a result, the second hinge 12 can rotate the connecting rod 10 and the multicopter 3 with each other within a rotation plane perpendicular to the horizontal reference plane of the multicopter 3 and rotate with each other outside the rotation plane. Connected immovably. Further, the rotation axis of the second hinge 12 extends in parallel with the rotation axis of the first hinge 11, and thereby, in a rotation plane parallel to the rotation surface of the frame 2 by the first hinge 11. Thus, the connecting rod 10 and the multicopter 3 are connected to each other so as to be rotatable.

  The connecting body 4 having the connecting rod 10, the first hinge 11, and the second hinge 12 allows the frame 2 to be rotated within a rotation plane that forms a right angle with respect to the horizontal reference plane of the multicopter 3. It is connected to the multicopter 3 so that it cannot rotate outside the rotation surface. Here, the fact that the frame 2 is rotatable within a rotation plane perpendicular to the horizontal reference plane of the multicopter 3 means that a predetermined point of interest on the frame 2 is relative to the horizontal reference plane of the multicopter 3. It means that the frame 2 rotates so as to draw a locus in a right-angle plane. In addition, the fact that the frame 2 is not rotatable outside the rotation plane perpendicular to the horizontal reference plane of the multicopter 3 means that a predetermined point of interest on the frame 2 is relative to the horizontal reference plane of the multicopter 3. It means that the frame 2 cannot rotate in a direction inclined with respect to a right-angle plane.

  The multicopter 3 includes four rotor blades arranged at positions that form a square apex in plan view, four motors that drive these rotor blades, a control device that controls each part of the multicopter 3 including the motor, and an operation A wireless communication device that performs wireless communication with a controller operated by a person, and a battery that supplies power to the motor, the control device, and the wireless communication device. The number of rotor blades and motors is not limited to four.

  The control device of the multicopter 3 has a CPU (Central Processing Unit), a main storage device, and an auxiliary storage device, reads a program stored in the auxiliary storage device to the main storage device, and executes processing related to the control of the multicopter 3 To do. The control device includes a three-axis gyro sensor, a three-axis acceleration sensor, a magnetic sensor, and a GPS (Global Positioning System) device. The three-axis gyro sensor detects angular velocities in three directions that define a three-dimensional space, and the three-axis acceleration sensor detects accelerations in three directions that define a three-dimensional space. The magnetic sensor detects azimuth by detecting geomagnetism. The GPS device receives a signal output from a GPS satellite and detects the current position. In addition, the control device may include an atmospheric pressure sensor that detects an altitude by measuring an atmospheric pressure, and an ultrasonic sensor that detects the presence of a surrounding object.

  The control device controls the rotation speed of the motor based on the detection value of the sensor and a command received from the controller through the wireless communication device. As a result, the multicopter 3 moves in the direction input by the operator to the controller, turns, and changes the altitude. Thus, the control device functions as the command response control device of the present invention when controlling the multicopter 3 based on the command from the controller.

  Further, the control device autonomously holds the attitude of the multicopter 3 in a horizontal manner independently of the command from the operator or separately from the command from the operator. At this time, the control device functions as the autonomous horizontal control device of the present invention. The horizontal control by the control device is performed by holding the multicopter 3 horizontally in the traveling direction view. Here, pitching that is inclined forward in the traveling direction of the multicopter 3 is allowed in accordance with the traveling direction in the front-rear direction. That is, when performing the autonomous horizontal control, the control device may hold the posture in the direction perpendicular to the traveling direction of the multicopter 3 horizontally, and appropriately control the posture in the traveling direction according to other conditions.

  In addition, the control device has a flight path storage unit in which flight path information indicating a flight path including a position to fly and an altitude is stored, and the flight path indicated by the flight path information stored in the flight path storage unit The automatic flight mode for controlling the number of rotations of the motor based on the detection value of each sensor is provided.

  The cable inspection device 1 configured as described above inspects the cable 15 as follows. First, a predetermined angle and plate of the frame 2 are detached to form an opening, the frame 2 is attached to the cable 15 through this opening, and then the angle and plate are mounted. Thereby, the frame 2 is installed so as to surround the cable 15. Subsequently, the multicopter 3 is connected to the other end of the connection body 4 of the frame 2 by the second hinge 12. Here, the direction in which the multicopter 3 is arranged is the front side toward the upper side of the inclined cable 15 and the rear side toward the lower side of the inclined cable 15.

  When the multicopter 3 is connected to the frame 2, the operator operates the controller to fly the multicopter 3 along the cable 15. The operator operates at a position on the bridge where the multicopter 3 can be visually recognized. When the operator inputs a forward and ascending command to the controller, the multicopter 3 arranged with the front side facing the upper side in the inclination direction of the cable 15 moves above the cable 15 along the cable 15 to the upper side in the inclination direction. Fly towards.

  At this time, the multicopter 3 flies by shifting from directly above the cable 15 and may form an inclination angle α above the cable 15 as shown in the front view of FIG. 6. Here, the multicopter 3 is connected to the frame 2 arranged so as to surround the cable 15 by the connecting body 4. That is, one end of the connection body 4 can be rotated with respect to each other within a rotation plane perpendicular to the horizontal reference plane of the multicopter 3 by the first hinge 11 and cannot be rotated with respect to each other outside the rotation plane. Connected to frame 2. At the same time, the other end of the connection body 4 is connected to the multicopter 3 by the second hinge 12 so as to be able to rotate with respect to each other within the rotation surface and not with respect to each other outside the rotation surface. Due to the restricting action of the first and second hinges 11 and 12 at both ends of the connection body 4, the multicopter 3 and the frame 2 can be rotated within the rotation surface and not rotated outside the rotation surface. Regulated as possible. On the other hand, in the multicopter 3, the number of rotations of the rotor blades is controlled by the control device so that the posture in the direction perpendicular to the traveling direction is horizontal, and is adjusted to be autonomously horizontal. As a result, the multicopter 3 is subjected to a rotational force around the center of gravity so that the inclination angle α becomes zero. However, since the multicopter 3 is connected to the frame 2 by the connecting body 4, Due to the regulating force of the first and second hinges 11 and 12, the moment of the rotational force is transmitted to the frame 2, and the frame 2 rotates around the cable 15. As a result, the multicopter 3 is disposed directly above the cable 15 as shown in FIG. In this way, if the multicopter 3 is controlled so as to fly substantially above the cable 15, the flight position of the multicopter 3 is autonomously adjusted directly above the cable 15 by the regulating action of the connection body 4. As a result, an operator who operates the controller does not need to perform a highly accurate operation for positioning the multicopter 3 directly above the cable 15, and may operate it so as to be positioned substantially above the cable 15. By such a simple operation, the multicopter 3 can be stably positioned directly above the cable 15 to fly.

  Thus, since the multicopter 3 may be operated so as to be positioned substantially above the cable 15, when connecting the multicopter 3 to the frame 2, the front-rear direction of the multicopter 3 is extended from the central axis of the cable 15 in plan view. If the direction is matched, the operation of the controller can be simplified. As the controller of the multicopter 3, there are many joystick type controllers, and many joystick type controllers have a left stick operated with the left hand and a right stick operated with the right hand. In this case, in accordance with the direction in which the left stick is tilted from the upright position, the rear side is advanced, the front side is retracted, the left side is turned left, and the right side is turned to the right. is there. In addition, there is a configuration in which a command is sent to the multicopter 3 so that the back side is raised, the near side is lowered, the left side is moved to the left, and the right side is moved to the right according to the direction in which the right stick is tilted from the upright position. In such a case, in order to operate the cable inspection device 1 of the present embodiment, the left stick commands the back side forward and the front side backward, and the right stick commands the back side up and the near side down. I can do it. Therefore, a restricting member for restricting the movement of the stick is installed in the controller so that the left stick and the right stick of the controller can be operated only on the back side and the near side. Examples of the restricting member include guide bars arranged on both sides with respect to an upright position of the stick, a cover having a groove extending from the back side to the near side of the stick, and the stick being inserted through the groove. It is done. By installing such a restricting member on the controller, the operator can easily and reliably perform only forward or backward and upward or downward commands. By such a simple operation, the multicopter 3 can be stably positioned directly above the cable 15 to fly.

  Thus, since the multicopter 3 flies directly above the cable 15, the frame 2 driven by the multicopter 3 moves in the axial direction of the cable 15 along the cable 15 without rotating around the cable 15. As a result, the camera 6 mounted on the frame 2 can stably shoot a predetermined position of the cable 15, and can effectively prevent a shift of the shooting position due to the rotation of the frame 2 around the cable 15. That is, the camera 6 as the inspection device can perform a stable and highly accurate inspection.

  Further, when the frame 2 is driven by the multicopter 3, the wheels 8 provided on the frame 2 are formed so that the pair of wheels 8 opposed to the cable 15 is larger than the diameter of the cable 15. Only one of the wheels 8 contacts the cable 15. Accordingly, the frictional force generated between the cable 15 and the wheel 8 can be reduced, and the frame 2 can be moved quickly with relatively small energy. That is, the battery consumption of the multicopter 3 is relatively small, and the inspection time of the cable inspection device 1 can be ensured for a relatively long time. Further, the surface of the bridge cable 15 may be provided with a convex portion such as a convex strip for preventing rain vibration, for example. Even if one of the wheels 8 comes into contact with such a convex portion, there is a gap between the other wheel 8 and the surface of the cable 15, so that the one wheel 8 is not locked to the convex portion. You can get over the convex part. Therefore, the wheel 8 of the frame 2 can stably move by rotating the surface of the cable 15.

  When driving the frame 2 with the multicopter 3, the multicopter 3 may be caused to fly by setting the control device to the automatic flight mode. In this case, flight path information indicating the path of the flight over the cable 15 along the cable 15 is stored in advance in the flight path storage unit of the control device of the multicopter 3. When the multicopter 3 flies in the automatic flight mode, it may deviate from a preset flight path due to errors of various sensors of the control device and the influence of wind. Even in such a case, the flight position of the multicopter 3 is autonomously adjusted directly above the cable 15 by the regulating action of the connecting body 4 that connects the multicopter 3 and the frame 2. Therefore, the rotation of the frame 2 around the cable 15 can be effectively prevented, and the cable 15 can be inspected stably.

  In the cable inspection device 1 according to the present embodiment, when the inspection is started or ended, there is a possibility that the multicopter 3 connected to the frame 2 approaches the cable 15 and that the rotor blades of the multicopter 3 come into contact with the cable 15. is there. In addition, the multicopter 3 connected to the frame 2 by the connecting body 4 loses lift when the rotor blades stop, so that the mass of the multicopter 3 may concentrate on the connecting body 4. Therefore, in the cable inspection device 51 of the modified example, the multicopter 3 is provided with an abutting member 17 that abuts against the cable 15 when the flight is stopped and maintains the posture at the time of stopping. FIG. 8 is a side view showing a state where the cable inspection device 51 of the modification is flying, and FIG. 9 is a front view of the cable inspection device 51 of the modification. In the cable inspection device 51, the contact member 17 is fixed to the main body frame of the multicopter 3. The contact member 17 includes two arms 18 and 18 extending downward from both sides in the width direction of the main body frame, and a contact bar 19 connected to the lower ends of the arms 18 and 18 and extending in parallel with the main body frame. . The contact bar 19 is provided with a buffer member at least in a portion that contacts the cable 15. The contact member 17 is formed such that the lengths of the arms 18 and 18 can be adjusted, whereby the distance between the main body frame of the multicopter 3 and the contact bar 19 can be adjusted. By adjusting the distance between the main body frame of the multicopter 3 and the contact bar 19 according to the inclination angle of the cable 15, the multicopter 3 can be connected to the cable 15 at various angles when the contact bar 19 contacts the cable 15. Can stabilize the posture. Further, it is possible to prevent inconvenience that the rotary blades of the multicopter 3 come into contact with the cable 15 when the contact bar 19 comes into contact with the cable 15.

  In the cable inspection device 51 of the modification, when the multicopter 3 flies, as shown in FIG. 8, the contact bar 19 of the contact member 17 is separated from the cable 15 and drives the frame 2. On the other hand, when the multicopter 3 stops flying, the connecting rod 10 of the connecting body 4 rotates around the first hinge 11 so that the multicopter 3 approaches the cable 15, and as shown in FIG. The connecting rod 19 contacts the surface of the cable 15. The stopped multicopter 3 is supported on the cable 15 by the contact member 17 and the connection body 4 connected to the frame 2. In the multicopter 3 in which the contact member 17 is in contact with the cable 15, the rotor blade is held in a posture away from the cable 15, so that the rotor blade comes into contact with the approaching cable 15 when the multicopter 3 is started or stopped. The inconvenience of being damaged can be effectively prevented. Moreover, since the multicopter 3 can be arrange | positioned with the stable attitude | position on the cable 15, the operation | work which arrange | positions the cable inspection apparatus 51 to the cable 15, and the operation | work removed from the cable 15 can be performed easily.

  In the above embodiment, the connection body 4 has one end of the connection rod 10 connected to the side surface of the frame 2 by the first hinge 11, but the connection position of the connection body 4 to the frame 2 is not limited to the side surface, Good. The connecting body 4 connects the frame 2 to the multicopter 3 such that the frame 2 can be rotated within a rotation plane perpendicular to the horizontal reference plane of the multicopter 3 and cannot be rotated outside the rotation plane. If it is, the connection position with the frame 2 is not particularly limited.

  In the above-described embodiment, the multicopter 3 is operated by an operator who operates the controller by visually observing the position of the multicopter 3. The multicopter 3 is equipped with a wireless camera that transmits a captured image by wireless communication. Then, an operator may visually recognize the captured image of the wireless camera and operate the controller.

  Moreover, the cable inspection apparatus formed to be driven and moved by the flying object may include the flying object.

  Moreover, although the cable inspection apparatus 1,51 of the said embodiment was used in order to inspect the cable which bridges, such as a cable-stayed bridge and a Nielsen Rose bridge as a structure, is not restricted to a bridge, for example, a radio tower, It can be applied to check various cables of tower structures such as power transmission towers and other structures such as high-rise buildings.

  Moreover, although the cable inspection apparatus 1 and 51 of the said embodiment used the camera which image | photographs the image of visible light as an inspection apparatus, other imaging devices, such as an infrared camera, an ultrasonic flaw detection apparatus, and an electromagnetic wave investigation apparatus In addition, various devices such as an X-ray survey apparatus can be employed.

DESCRIPTION OF SYMBOLS 1,51 Cable inspection apparatus 2 Frame 3 Multicopter 4 Connection body 6 Camera 8 Wheel 10 Connection rod 11 1st hinge 12 2nd hinge 15 Cable 17 Contact member

Claims (9)

A frame which is arranged so as to surround the cable to be inspected and on which inspection equipment for performing the inspection is mounted;
At least one pair of wheels mounted opposite the frame and rotating against the cable;
The frame is connected to one end, and the flying body is connected to the other end so that the frame can be rotated in a rotating plane perpendicular to the horizontal reference plane of the flying object, and the rotating surface A cable inspection device comprising: a connection body that is non-rotatably connected outside. In the cable inspection apparatus according to claim 1,
One end of the connection body is connected to the frame by a first hinge that connects the frame and the connection body to each other within the rotation surface and to be non-rotatable from each other outside the rotation surface. The other end of the aircraft is connected to the flying body by a second hinge that connects the flying body and the connecting body within the rotation plane so as to be rotatable and out of the rotation plane. Cable inspection device to do. In the cable inspection apparatus according to claim 1,
The cable inspection apparatus according to claim 1, wherein the flying object includes an autonomous horizontal control device that autonomously holds a posture in flight horizontally. In the cable inspection apparatus according to claim 1,
The above-mentioned flying object has a command response control device which controls a flight position in the air according to a forward or backward command and an ascending or descending command received by wireless communication. In the cable inspection apparatus according to claim 1,
The cable inspection device, wherein the pair of wheels are attached to the frame so that when one wheel contacts the surface of the cable, the other wheel forms a gap with respect to the surface of the cable. In the cable inspection apparatus according to claim 1,
The cable inspection device according to claim 1, wherein the wheel is formed in a roller shape having a rotation axis extending in a direction orthogonal to a central axis of the frame. The cable inspection device according to claim 5,
The frame is formed such that the axial dimension of the cable is larger than the dimension perpendicular to the axial direction, and two pairs of wheels facing each other in the vertical direction and the horizontal direction when viewed in the axial direction of the cable are respectively provided on both sides in the longitudinal direction. Cable inspection device characterized by being arranged. In the cable inspection apparatus according to claim 1,
The cable inspection apparatus according to claim 1, wherein the flying object has an abutting member that abuts on the cable when the flight is stopped and maintains a posture at the time of stopping. The cable inspection device according to claim 8,
The aircraft has a rotating wing, and is configured to maintain a posture in which the rotating wing does not contact the cable when the contact member contacts the cable. apparatus.

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