JPH07121492B2 - Nut installation and removal tool for overhead distribution lines - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a nut attaching / detaching tool for an overhead distribution line that detaches a nut for fixing an insulator that supports the overhead distribution line in a live state, for example.

(Prior Art) Recently, it has been attempted to attach an aerial distribution line to a column arm via a discharge clamp to prevent an accident due to a lightning strike. In order to install such a discharge clamp, the insulator that has conventionally attached the overhead distribution line to the armband is removed, and then this discharge clamp is attached. Recently, it has been proposed to safely perform hot-line work on such a pillar by a robot, but in this case, a nut attachment / detachment tool to be attached to the tip of the robot arm is required. The nut to which the insulator or the discharge clamp is to be mounted must move back and forth while rotating the tool body that engages this nut.

Generally, in various fields, a nut tightening machine that tightens a nut to attach a component to a threaded portion of an attached object (for example, see Japanese Utility Model Laid-Open No. 55-80137), and an object to be attached to replace the component A nut removing device for removing the nut from the screw portion (for example, see Japanese Utility Model Laid-Open No. 58-67631) has been proposed.

Since these nut tighteners and nut removers are all used on the ground, it is difficult to see the tool align with the nut as the working parts of these equipment can be easily aligned with the nut. It is not possible to directly apply it to the work of overhead distribution lines that is work at high altitudes, and with conventional equipment, it is not possible to remove the nut and tighten the nut with a common tool, so Has to be replaced, which has the drawback of requiring a long working time in high places.

Further, since the nut attaching / detaching work at a high place is carried out by mounting the tool on the robot arm, if the tool is overhanging greatly from the robot arm, the electric wire will be easily caught during the work and should be screwed onto the nut. If the threaded portion of the component is long, the stroke at the time of attaching and detaching the nut becomes large. Therefore, it is preferable that the entire tool is designed so that its axial length is as short as possible.

(Object of the Invention) An object of the present invention is to easily attach and detach a nut that fixes a component fixed to an overhead distribution line at a high place such as an insulator or a discharge clamp that supports the overhead distribution line without changing tools. Another object of the present invention is to provide a nut attaching / detaching tool for an overhead power distribution line, which can be designed to be short in the axial direction as a whole.

(Structure of Invention) A nut detaching tool for an overhead distribution line according to the present invention includes a nut removing tool body for detaching a nut for fixing an insulator or the like for supporting the overhead distribution line, and a robot for moving the tool body to the vicinity of the overhead distribution line. The fixed frame attached to the arm, the movable frame which is slidably supported by the fixed frame and which slides the tool body forward and backward with respect to the nut, and the movable frame attached to the fixed frame. The tool body is connected to a drive shaft rotatably supported on the movable frame via a universal joint having a spring for self-alignment. In addition, the movable frame is equipped with a fluid motor that is reversibly driven to rotate the tool main body in the nut tightening direction and the nut removal direction by being connected to the drive shaft, and the linear drive source, the drive shaft, and the fluid motor are parallel to each other. It is characterized in that they are arranged in rows and the fluid motor and the drive shaft are connected via a transmission mechanism, and the linear drive source is set to advance and retract the movable frame as the fluid motor rotates.

With this configuration, the nut attachment / detachment tool body is mounted on the fixed frame attached to the robot arm, so it is possible to attach / detach nuts that fix parts such as insulators and discharge clamps that support overhead distribution lines at high places. However, since the tool body advances and retreats by the linear drive source while rotating by the fluid motor, the nut tightening and nut removal can be performed in common by matching the rotation of the fluid motor and the linear motion of the linear drive source. It can be performed by using the main body, and therefore, the nut attaching / detaching operation can be performed without changing the tool.

Further, since the tool body is connected to the drive shaft via a universal joint having a spring for self-alignment,
Even if the drive shaft side slightly shakes at a high place, it can follow the bending action of the universal joint and keep the tool body securely engaged with the nut. Although it can be bent freely, it is normally held by a spring for self-alignment so as to extend straight, so the tool body is engaged with the nut when removing the nut, or the nut inside the tool body is parted when tightening the nut. It is possible to reliably perform work such as screwing into the mounting screw part, and also this self-aligning spring also has the function of elastically tightening the nut by elastically acting the tool body on the nut be able to.

Especially, it should be noted that, since the linear drive source, the drive shaft, and the fluid motor are arranged mutually, the axial length of the entire tool is increased as compared with the case where all or a part of them are arranged in series. Therefore, the tool is not caught on the electric wire during the work, and the trouble is reduced even if the threaded portion of the component to be screwed into the nut is long and the stroke for detaching the nut is large.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a nut attaching / detaching tool 10 for an overhead distribution line according to the present invention, and FIG. The usage state of the electric wire nut detachment tool 10 is shown. As shown in FIG. 3, the nut attaching / detaching tool 10 for the overhead distribution line has a nut 38 for fastening the insulator 36 or the like supporting the overhead distribution line to the arm member 40 by tightening it on the screw portion 36a of the insulator 36 or the like. Nut removal tool main body 12 consisting of spanner of cylindrical gauge for removing the tool, and robot arm 14 for moving the tool main body 12 to near the overhead distribution line (see Fig. 3)
A fixed frame 16 having a flange 16a attached to the movable frame 18, a movable frame 18 slidably supported by the fixed frame 16 and equipped with a tool main body 12 and moving the tool main body 12 forward and backward with respect to a nut; A linear fluid drive source including an air cylinder mounted and driving the movable frame 18 so as to slide on the fixed frame 16.
It has 20 and. The linear drive source 20 is attached to the movable frame 18 via a chevron bracket 20a as shown in FIG. 2, and the clevis body 20c provided at the tip of the piston rod 20b of the linear drive source 20 is a connecting arm of the fixed frame 16. The cylinder body is engaged with 16b, and by supplying air to the linear drive source 20, the cylinder main body moves in the axial direction with respect to the fixed piston rod 20b and slides on the movable frame 18.
The tool body 12 is connected via a universal joint 26 to a drive shaft 24 that is rotatably supported by bearings 22 and 22 'provided on the movable frame 18, and the movable frame 18 has a drive shaft 24
A fluid motor 28 such as an air motor that rotationally drives is mounted. The linear drive source 20 that linearly moves the tool body 12, the drive shaft 24 that rotationally drives the tool body 12, and the fluid motor 28 that drives this drive shaft, as shown in FIG. 1 and FIG. Fluid motor 28 and drive shaft 24 arranged in parallel
And are connected via a belt transmission mechanism 32. When the linear drive shaft 20, the drive shaft 24, and the fluid motor 28 are arranged in this way, the axial length of the entire tool can be significantly shortened as compared with the case where all or part of these are arranged in series. Therefore, the tool 10 does not catch the electric wire during the nut attaching / detaching work, and the screw portion 36a of the component to be screwed into the nut 38 is long, so that there is little trouble even if the stroke for attaching / detaching the nut increases. . In FIG. 1, reference numeral 29 is a silencer for the fluid motor 28, and reference numeral 30 is a fluid motor.
28 reducers.

As can be seen from FIG. 1, the universal joint 26
The tool body (12) has a spring (34) arranged around the tool body (12) so as to elastically engage with the nut (38) and provided between the drive shaft (24) and the tool body (12) for self-alignment. This spring 34
Compressed between the drive shaft 24 and the tool body 12, normally has a self-aligning action of holding the tool body 12 in alignment with the drive shaft 24 so as to extend straight, and at a high place, the drive shaft 24 side is It swings up, down, left and right with respect to the axis of the drive shaft 24 so as to keep the tool body 12 securely engaged with the nut 38 by following the bending action of the universal joint 26 even with some shaking. I am able to do so.

Next, referring to FIG. 3, a usage state of the nut attaching / detaching tool of the present invention is shown. In FIG. 3, for example, an insulator 36 supporting the overhead distribution line 34 or a nut 38 for fixing a discharge clamp or the like is shown.
Shows the case of loosening. In this case, first, the linear drive source
The air cylinder 20 is kept in an extended state, the robot arm 14 is operated to bring the tool body 12 close to the nut 38, and the tool body 12 is engaged with the nut 38 to complete the preparation for work. Next, while driving the fluid motor 28, the linear drive source 20
The air cylinder is gradually contracted according to the rotation speed of the fluid motor 28. In this way, the tool body 12 moves backward while loosening the nut 38, and the nut 38 can be removed from the insulator 36 or the discharge clamp. In this case, since the tool main body 12 is held by the spring 34 for self-alignment so as to hold the universal joint 26 straight and extend in alignment with the drive shaft 24, the tool main body 12 is attached to the nut 38.
Can be securely engaged. Also, drive shafts at high altitude
Even if there is some shaking on the 24 side, the spring 34 for self-alignment follows the bending action of the universal joint 26 and the tool body 12
Since it is maintained in a state where it is securely engaged with the nut 38, the nut removing work at a high place can be reliably performed.

After that, as shown in FIG. 3, when tightening the nut 38 to attach the insulator 38 or the discharge clamp to the arm 40, first, the air cylinder which is the linear drive source 20 is contracted, Nut engaged in tool body 12
The robot arm 14 is operated so that 38 is screwed into the screw 36a of the disclosure 36 or the discharge clamp, and the linear drive source is driven at the speed corresponding to the rotational speed of the fluid motor 28 while driving the fluid motor 28 in the reverse direction. Gradually extend the 20 air cylinder. In this way, the tool body 12, the nut 38 and the insulator are
36 or clamped to the discharge clamp to secure it.

In this case, the tool body 12
Is held by the spring 34 for self-alignment so that the universal joint 26 is held straight and extends in alignment with the drive shaft 24, so that the nut 38 in the tool body 12 is securely screwed into the threaded portion 36a. Can be combined. Further, similarly, even if the drive shaft 24 side is slightly shaken at a high place, the self-aligning spring 34 follows the bending action of the universal joint 26, and the tool main body 12 remains securely screwed with the nut 38. Since the state is maintained, the nut tightening work at a high place can be reliably performed. Furthermore, this self-aligning spring 34
Also has a function of elastically acting the tool body 12 on the nut 38 to tighten the nut.

(Effects of the Invention) According to the present invention, as described above, the nut attaching / detaching tool main body is mounted on the fixed frame attached to the robot arm, and the nuts for fixing the parts such as the insulator and the discharge clamp that support the overhead distribution line are provided. Can be removed at high places, but the tool body
Since it moves forward and backward by the linear drive source while rotating by the fluid motor, nut tightening and nut removal can be performed using the common tool body by matching the rotation of the fluid motor and the linear motion of the linear drive shaft. Therefore, it is possible to efficiently replace the parts by attaching / detaching the nuts for attaching the parts of the overhead power distribution line without exchanging the tools at a high place.

Further, since the tool body is connected to the drive shaft via a universal joint having a spring for self-alignment,
Even if the drive shaft side slightly shakes at a high place, it can follow the bending action of the universal joint and keep the tool body securely engaged with the nut. In addition, the tool body can be bent freely by a universal joint, but it is normally held so as to extend straight by a spring for self-alignment. There is a practical benefit in that the work of engaging with the nut or screwing the nut in the tool body to the threaded portion for attaching the component can be reliably performed when tightening the nut.

In addition, the self-aligning spring around the universal joint also has the function of elastically tightening the nut by elastically acting the tool body on the nut, so the number of parts does not increase and the overall size is small. There is a real benefit that can be realized.

In particular, since the linear drive source, the drive shaft, and the fluid motor are arranged in parallel with each other, the axial length of the entire tool becomes significantly shorter than when all or part of them are arranged in series. Therefore, there is an advantage that the tool does not catch the electric wire during the nut attaching / detaching work, and the screw portion of the component to be screwed into the nut is long and the trouble is small even if the stroke for attaching / detaching the nut becomes large.

[Brief description of drawings]

1 and 2 are a top view and a side view of a nut attaching / detaching tool for an overhead distribution line according to the present invention, and FIG. 3 is a view showing a usage state of a tool body. 10 …… Tool for removing and installing nuts for overhead distribution lines, 12 …… Tool body, 14
…… Robot arm, 16 …… Fixed frame, 18 …… Movable frame, 20…
… Linear drive source, 24 …… Drive shaft, 26 …… Universal joint, 28 …… Fluid motor, 34 …… Self-aligning spring, 36
…… Insulator, 36a …… Screw part, 38 …… Nut.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Watanabe 6 Yawata Kaigan Dori, Ichihara City, Chiba Furukawa Electric Co., Ltd. Chiba Electric Wire Works (72) Inventor Jo Takeuchi 6 Hachiman Kaido Dori, Ichihara City, Chiba Furukawa Electric Co., Ltd. Company Chiba Electric Works (56) Bibliography SHO 58-67631 (JP, U)

Claims (1)

[Claims] 1. A nut attachment / detachment tool main body for attaching / detaching a nut for fixing an insulator or the like supporting an overhead distribution line, a fixing frame attached to a robot arm for moving the tool main body to the vicinity of the overhead distribution line, and the fixing. A movable frame that is slidably supported by a frame and that mounts the tool main body and slides the tool main body forward and backward with respect to the nut; and a movable frame that is attached to the fixed frame and that moves the movable frame over the fixed frame. A linear drive source that is slidably driven, the tool body is connected to a drive shaft that is rotatably supported on the movable frame through a universal joint having a self-aligning spring, and A fluid motor, which is connected to the drive shaft and drives the tool body to reversibly rotate in the nut tightening direction and the nut removing direction, is mounted on the movable frame, and the linear drive source and the drive shaft are provided. The fluid motor is arranged in parallel with each other, the fluid motor and the drive shaft are connected via a transmission mechanism, and the linear drive source is set so as to advance and retract the movable frame as the fluid motor rotates. A nut attachment / detachment tool for overhead distribution lines that is characterized by