JPH0713978Y2 - Switch bolt tightening tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a bolt tightening tool for a switch, and particularly when mounting or removing the switch during construction on an overhead wire, tighten the switch bolts and nuts. Regarding tools.

[Conventional technology]

At the time of construction on an overhead wire, a switch may be attached to or removed from the top of a concrete pillar (con pillar) that supports the wire. In such a case, for example, the work for attaching the switch SWT to the arm BKT (see FIG. 4) provided on the pillar is performed as follows. That is, the switch SWT is positioned under the arm BKT of the concrete pillar, and the fixing plate
Put the PLT over the armor BKT and insert two or four bolts BLT protruding from the top surface of the switch SWT into the mounting holes of the fixed plate PLT. After that, an operator riding on a bucket on an aerial work vehicle tightens the bolts BLT and nuts NUT one by one using a predetermined tightening tool, and hangs the switch SWT on the arm BKT to form a concrete pillar. Install.
When removing the switch SWT, perform the work in the reverse order of mounting.

[Problems to be solved by the device]

By the way, as shown in FIG. 4, the switch SWT is attached by a plurality of bolts BLT across the armor BKT. Therefore, if the bolts BLT are attached one by one as in the conventional case, one bolt BLT is attached. While tightening, the switch SWT may lose balance due to its own weight. For this reason, there is a problem that it takes a lot of time to properly install the switch SWT, and it has been desired to devise a tool capable of simultaneously tightening at least two bolts BLT.

In recent years, in order to reduce the labor of workers and to avoid the danger from high voltage due to indirect live work, a distribution line work robot (manipulator) is mounted on an aerial work vehicle, and various manipulators are mounted at the tip of this manipulator. It is common to work with a special tool attached. Therefore, it has been desired to devise a tool that can be operated at the tip of a manipulator and that can attach and disconnect the switch SWT safely and quickly.

In view of the above, an object of the present invention is to provide a switch bolt tightening tool capable of tightening and loosening bolts and nuts for mounting a switch and fast and safe tightening and loosening.

[Means for Solving the Problems]

In order to solve the above problems, a bolt tightening tool for a switch according to the present invention is provided with a differential transmission for transmitting a driving force of a hydraulic motor 1 (see FIG. 1) to two differential shafts (an inner shaft 2 and an outer shaft 3). The dynamic gear mechanism 4, the bevel gears 5 and 6 for converting the two shafts 2 and 3 to which the rotational force is transmitted from the differential gear mechanism 4 in a right angle direction, and the rotational force from the bevel gears 5 and 6 are transmitted. Socket part for tightening bolts and nuts to be tightened at the same time at two points via two spline shafts 7, 7.
8 and fixed to the case 10 that houses the differential gear mechanism 4,
A reaction force receiver 9 that receives the reaction force of the rotational force generated during this tightening is provided.

[Operation] While positioning the switch SWT under the arm BKT of the concrete pillar, the reaction force receiver 9 of the bolt tightening tool is abutted against the arm BKT, and the socket 8 of the tool and the bolt B of the switch SWT.
Set so that the LT positions match. Then, when the hydraulic motor 1 is operated, the driving force of the hydraulic motor 1 is transmitted to the two differential shafts 2 and 3 via the differential gear mechanism 4. Then, the rotational force of these two shafts 2 and 3 is transmitted through the bevel gears 5 and 6 corresponding to each of the two shafts by converting the direction to a right angle direction, and the rotational force is further transmitted to the two spline shafts 7 and 7. It is transmitted to the socket part 8 via 7 and the bolts BLT at two locations of the switch SWT are simultaneously tightened with the nut NUT.

〔Example〕

An embodiment of a bolt tightening tool for a switch according to the present invention will be described with reference to the drawings.

1 is a schematic explanatory view of a bolt tightening tool for a switch according to the present invention, FIG. 2 is a side sectional view of the tool, and FIG. 3 is a plan sectional view of the tool.

In FIG. 2, 1 is a hydraulic motor, 2 is an inner shaft, 3 is an outer shaft, 4 is a differential gear mechanism for transmitting the driving force of the hydraulic motor 1 to an inner shaft 2 and an outer shaft 3, 5, 6 Is a bevel gear that converts the rotational force transmitted to the inner shaft 2 or the outer shaft 3 into a right angle direction, 7 is two spline shafts that rotate the rotational force from the inner shaft 2 or the outer shaft 3 by the bevel gear 6, 8,8 are located at the tips of these two spline shafts 7,7 and the nut N is attached to the bolt BLT of the switch SWT.
Socket part for tightening UT, 9 is differential gear mechanism 4
It is a reaction force receiver that is fixed to a case 10 that stores the like through grooved steel and that receives a reaction force generated during tightening.

Next, in the work of mounting the switch SWT on the concrete pillar, the tightening operation of the bolt tightening tool of the switch of the present invention will be described in detail.

The switch SWT has already been lifted to the mounting position by the operator using the manipulator MPU or the like mounted on the aerial work vehicle, and the fixing plate PLT for fixing the switch SWT also clamps the arm BKT. It is assumed that it is covered with the switch SWT.

First of all, the worker is the mounting socket for the bolt tightening tool.
Insert the tip of the manipulator MPU into 11 and lift it up.
The reaction force receiver 9 of the tool is placed on the arm BKT of the concrete pillar and moved back and forth so that the upper end of the bolt BLT of the switch SWT and the socket portions 8 of the tool are aligned. It is assumed that the nut NUT is preset in the box of the socket parts 8, 8. In this state, the operator operates the hydraulic motor 1 by remote control to open the switch SW.
Tighten the nut NUT to the bolt BLT of T.

That is, when the hydraulic motor 1 (see FIG. 2) is operated, the rotational force of the motor shaft 14 is transmitted to the differential gear cases 12 and 13 (the motor shaft 14 and the differential gear case 12 are fixed pins. Fixed).

The rotation of the differential gear cases 12 and 13 is performed by the differential gear mechanism 4.
Rotation is transmitted to the left and right bevel gears 15 and 16 by the load of each output shaft (the inner shaft 2, the outer shaft 3, etc.).

The rotation of the bevel gear 16 is transmitted to the outer shaft 3, meshes with the spur gear 18 (see FIG. 3) via the spur gear 17, and is transmitted to the shaft 19. Further, the rotating force of the shaft 19 is transmitted from the bevel gear 5 to the meshing bevel gear 6, and the rotating force is transmitted to the shaft 20.
Spur gear 22 meshes with spur gear 21 via (see FIG. 2)
The rotational force is reduced to 1/2 and transmitted to. Further, the rotational force of the spur gear 22 is transmitted to the spline shaft 7 via the spline bearing 23 fixed to the spur gear 22, and the rotational force is transmitted to the socket portion 8 fixed to the tip of the spline shaft 7. .

On the other hand, the rotation of the bevel gear 15 is transmitted to the inner shaft 2, is transmitted to the meshing spur gear 25 via the spur gear 24, and the rotational force of its shaft 26 (see FIG. 3) is the same as that of the outer shaft 3. Is transmitted from the bevel gear 5 to the meshing bevel gear 6, and the rotational force thereof is transmitted through the shaft 20 (see FIG. 2) to the half of the rotational force of the meshing spur gear 22 from the spur gear 21. . Further, the rotational force is transmitted to the socket portion 8 via the spur gear 22 and the spline shaft 7.

As described above, the tightening tool of the present invention is the differential gear mechanism 4
Is performed using. The reason for using this differential gear mechanism 4 is that even if there is a slight difference in biting between the bolt BLT and the nut NUT at two locations, it can be tightened in a well-balanced manner by rotating differentially. Is. Further, since the two shafts are tightened at the same time, even if the tightening of the bolt BLT or the nut NUT on one side is completed, the tightening can be performed differentially if the tightening of the other side is not completed. That is, by using the differential gear mechanism 4, when a load starts to be applied to the bolt BLT during tightening, the left and right bolts BLT can be tightened evenly and in good balance.

On the other hand, using this tightening tool, switch BWT bolts BLT
When loosening the nut NUT and the nut NUT, the differential gear mechanism 4 works and it is sufficient to loosen the two shafts at the same time. However, if it does not loosen, or if the load is different due to rust etc., the bolt with the larger load BLT And since the nut NUT will not loosen permanently, it will be necessary to cancel the differential gear effect when loosening.

Therefore, in the embodiment of the present invention, in order to cancel the differential effect, the outer shaft 3 and the inner shaft 2 are fixed by using the set screw 30. Then both shafts 2, 3
Rotate in the same direction (for example, counterclockwise direction), so bevel gear 15 and bevel gear 16, which are fixed to both shafts 2 and 3 by a key, always rotate at a constant speed. The small bevel gears 31, 31 cannot rotate and the rotation and transmission force of the differential gear cases 12, 13 that rotate in synchronization with the motor shaft 14 are transmitted to the bevel gears 15 and 16 at the same rotation, with equal rotation torque. Therefore, the differential action is canceled. In the above-described embodiment, the differential action is performed / released by the setscrew 30, but the meshing clutch is engaged / disengaged between the inner shaft and the motor shaft due to the difference in the rotation direction of the motor shaft. That is, when the rotation of the socket shaft corresponds to the loosening direction of the motor shaft, the meshing clutch is engaged to release the differential action, and when the rotation is in the opposite tightening direction, the meshing clutch is disengaged. If a mechanism capable of performing a differential action is provided, work can be performed more quickly.

By the way, the switch SWT has about 70 mm extra length of the bolt BLT to be tightened. Then, with the socket parts 8 and 8, the nut NUT
When the nut is tightened or loosened, the position of the nut NUT (that is, the position of the sockets 8 and 8) descends or rises along the bolt BLT, and in synchronization with the descending and ascending, the tool rises or only one side It lifts up and tilts.

However, it is very troublesome to move the tool with the manipulator in response to the change in the position of the nut NUT, so in this tightening tool, the socket parts 8 and 8 transfer the rotational force in synchronization with the ascent and descent. However, the structure is such that each can slide individually in the direction of the rotation axis. That is, the socket parts 8 and 8 are arranged so that the positions of the socket parts 8 and 8 can be freely moved along the spline shafts 7 and 7.
While transmitting the rotational force to the bolt BLT and the nut NUT via 7, 7, the springs 32 inserted in the spline shafts 7, 7 are individually biased in the direction of the rotational axis to make a sliding transition. .

In the above embodiment, the case where the pitch between the two bolts BLT is fixed to the dimension a as shown in FIG. 3 is described. However, a tool suitable for the pitch of the mounting bolts BLT of the switch SWT is used. Equipment efficiency is not good because each is prepared.
Therefore, as another embodiment, as shown in FIG. 3, a slotted hole LHL (see a chain double-dashed line portion) is provided so that the spur gear 22 can move while engaging with the center P ₀ of the spur gear 21 as an axis. It is also possible to configure the flange portion of the case 10 in a structure that can be adjusted to the pitch between the bolts BLT.

[Effect of device]

As described above, according to the present invention, the driving force of the hydraulic motor is differentiated.
The differential gear mechanism that transmits to the shaft, the bevel gear that converts the two axes transmitted from this differential gear mechanism to the right-angle direction, and the rotational force transmitted to this bevel gear are set on the bolts and nuts to be tightened. Fixed to the case that houses the differential gear mechanism, etc.
Since it is configured to have a reaction force receiver that receives a reaction force generated during tightening, the bolts and nuts of the switch can be tightened quickly and safely at the same time.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a bolt tightening tool for a switch according to an embodiment of the present invention, FIG. 2 is a side sectional view of the tool, and FIG. 3 is a plan sectional view of the tool seen from a lower surface. The figure is an explanatory view when a conventional switch is attached. 1 ... hydraulic motor, 2 ... inner shaft, 3 ... outer shaft, 4 ... differential gear mechanism, 5,6 ... bevel gear, 7 ... spline shaft, 8 ... socket part, 9 ... Forced.

Claims (2)

[Scope of utility model registration request] 1. When constructing an overhead wire, an armature of a concrete column supporting the overhead wire is sandwiched between the switch body and a fixing plate, and an even number of wires protruding from the top surface of the switch body are provided. Insert a bolt into the mounting hole of the fixing plate, tighten the bolt with a nut, and attach the switch to the arm of a concrete pillar. With a bolt tightening tool for the switch, transfer the driving force of the hydraulic motor to two axes that are differential. Differential gear mechanism, a bevel gear that converts the two-axis rotational force transmitted from the differential gear mechanism into a right-angled direction, the bolt to tighten the two-axis rotational force transmitted by the bevel gear, and A socket portion for gripping the nut and tightening the nut, and a fixed case fixed to a case accommodating the differential gear and the like, the reaction force generated when the socket portion is tightened is A bolt tightening tool for a switch, comprising: a reaction force receiver that abuts against an arm bar. 2. The socket portion transmits a rotational force from the bevel gear to a bolt and a nut via a spline shaft, and is urged by a spring inserted in the spline shaft in the direction of the rotary shaft center of each spline shaft. The bolt tightening tool for a switch according to claim 1, further comprising a structure capable of freely moving.