JPH073773Y2 - Edge cutting gripping tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an edge gripping tool, and particularly to gripping an electric wire or the like by using hydraulic pressure in an indirect live installation work of a transmission / distribution wire which is performed in an uninterrupted state. At the same time, it relates to an edge-cutting gripping tool capable of isolating and insulating an electric wire after cutting.

[Conventional technology]

In some cases, indirect live construction of transmission and distribution lines may be carried out without interruption of electricity (without stopping electricity). Even in such a case, it is inevitable that only the construction part will have a power outage during the construction work,
Various construction methods are used to minimize the power outage range.

FIG. 7 is an explanatory view showing an example of such a construction method.

In the figure, POL _{1 to} POL ₃ are concrete pillars (con pillars),
EW electric wire, INS ₁ ~INS ₃ is insulator for fixing the electric wire EW and on either side of the con pillars _{POL 1 ~POL 3, JW 1 ~JW} 3 is con pillars POL ₁
~ It is a rim line (jumper wire) provided between insulators INS _{1 to} INS ₃ on both sides of POL ₃ . Further, in the figure, the live line portion is indicated by a thick solid line.

For example, (see the thick broken line portion) bypass cable between the case, the configuration column POL ₁ and Con pillar POL ₃ sandwiching the work column POL ₂ to perform configuration pillar POL ₂ in new construction and replacement work or the like transmission and distribution lines
Provide with BYP, grasp the jumper wire JW ₁ or jumper wire JW ₃ with certainty, and after cutting, perform the work to isolate and insulate the cut surface (edge cutting work), cut the power between them, and set it in the concrete pillar POL ₂ . Was under construction.

By the way, the indirect live work of the transmission and distribution lines as described above is generally performed by an operator riding a bucket on an aerial work vehicle and operating various dedicated tools suitable for the contents of the edging work. Is. Furthermore, in recent years, in order to reduce the labor of workers and avoid the danger from high voltage associated with indirect live work, a live-line robot (manipulator) is mounted on an aerial work vehicle, and various special tools are attached to the tip of this manipulator. It has come to be attached and work.

[Problems to be solved by the device]

However, the edge cutting work to securely insulate the live wire parts (jumper wires JW ₁ and JW ₃ ) and to isolate and insulate them after cutting is performed by using a conventional manual tool. And, a tool that can be attached to the tip of the manipulator to perform edge cutting work by remote control is
Did not exist. For this reason, conventionally, it took a lot of time to cut the edge of the live line part, and in turn, a great deal of time to carry out the indirect live line work, and there was a problem that the work could not be speeded up.

From the above, the object of the present invention is to safely and quickly perform a series of operations of holding an object to be grasped, such as an electric wire, and cutting the object to be grasped and then separating it by a certain distance to completely insulate the object. It is an object of the present invention to provide an edge-gripping tool capable of performing the above.

[Means for Solving the Problems]

As a concrete means for solving the above-mentioned problems, the edge cutting and grasping tool of the present invention comprises a pair of grasping parts in which a grasping cylinder is connected to the base end of a clamp for grasping an object to be grasped such as an electric wire, An edge-cutting gripping tool composed of a hydraulic cylinder for isolation having an insulator adhered to its tip and a pressure control valve that switches the circuit when the hydraulic pressure reaches a predetermined set value. The gripping portion provided in the hydraulic circuit on the side grips or releases two points on the axis of the gripped object such as an electric wire by the expansion and contraction operations of the gripping hydraulic cylinder, and the secondary of the pressure control valve. Connecting the rod side and the base end side of the isolation hydraulic cylinder provided in the side hydraulic circuit to the bases of the pair of gripping parts, and reciprocating in the axial direction of the gripped object through switching of the pressure control valve. Exercise , Characterized in that connected to the hydraulic source via a counterbalance valve for pressure oil return prevention in the hydraulic circuit of the primary side and the secondary side.

[Action]

The manipulator mounted on the side of the work vehicle holds the edge cutting gripping tool, approaches the jumper wire JW, and positions the edge cutting gripping tool almost in the middle of the jumper wire JW. Then, when the initial pressure oil is made to flow into the edging gripping tool from the work vehicle side through the couplers 7a, 7b, the gripping cylinders 11a, 11b are activated and the gripping portions 1a, 1b move the two points on the jumper wire JW. Hold it.

Next, after cutting the jumper wire JW with a cutter while holding two points on the jumper wire JW, the pressure oil on the work vehicle side is switched to a pressure exceeding the set value of the pressure control valve 2 (see FIG. 4). Then, the isolation hydraulic cylinder 4 extends and the cut portion of the jumper wire JW is separated by a certain distance (6th
See figure).

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an edge-gripping tool according to the present invention, and FIG.
The figure is a side view of the tool.

In FIG. 1, 1a and 1b are gripping parts, and the gripping parts 1a and 1b are two points on the axis of the object to be gripped (for example, jumper wire) JW,
Grip or release via hydraulic circuit. A pressure control valve (sequence valve) 2 switches the circuit when the hydraulic pressure in the hydraulic circuit reaches a predetermined set value. The sequence valve 2 is preset to switch the circuit at 140 kg / cm ² . 3 is two grips 1
It is an insulator for insulating a and 1b. Reference numeral 4 is a hydraulic cylinder for isolation, which fixes two gripping portions 1a and 1b on the rod side and the base end side through an insulator 3, respectively, and reciprocates in the axial direction of the jumper wire JW through switching of the sequence valve 2. . 5 is a counterbalance valve. In FIG. 2, 11a and 11b are gripping cylinders that grip or release the gripping portions 1a and 1b by the extension and contraction operations of the load.

3 to 5 are hydraulic circuit diagrams of the edge-cutting and holding tool according to the present invention. Hereinafter, the operation of the edging / gripping tool will be described in detail with reference to the hydraulic circuit diagram. In addition, as described in the related art, the edging operation is performed by securely grasping the jumper wire JW and isolating and insulating the jumper wire JW after cutting.

Connect the hose on the side of the work vehicle and the hose for the edge gripping tool with couplers 7a and 7b. However, at this time, the switching valve (electromagnetic valve) 8 on the work vehicle side is set to the neutral position.

Next, the manipulator (not shown) mounted on the work vehicle holds the edge-cutting gripping tool, approaches the jumper wire JW with the edge-cutting gripping tool, and jumper wire JW.
Position it approximately in the middle of.

Then, when the solenoid valve 8 on the side of the work vehicle is operated, pressure oil flows from the A ₁ port of the solenoid valve 8 into the circuit as shown in the hydraulic circuit diagram of FIG. 3 and enters the chamber a of the gripping cylinders 11a and 11b. , The piston rises and the heads of the grips 1a, 1b move in the closing direction,
At this time, the relief valve (not shown) on the work vehicle side is 100 kg / cm ²
Be set to. When the pressure exceeds 100 kg / cm ² , the relief valve operates and the pressure oil returns to the drain circuit on the working vehicle side. Further, since the initial hydraulic pressure is equal to or lower than the set value (140 Kg / cm ² ) of the sequence valve 2, the isolation hydraulic cylinder 4 does not operate. On the other hand, when the pistons of the gripping cylinders 11a and 11b move up, the oil in the b chamber returns from the B ₂ or B ₃ port to the B ₁ port of the work vehicle side solenoid valve 8.

Next, while holding two points on the jumper wire JW, the operator operates the manipulator to cut the jumper wire JW with a predetermined cutter. After cutting the jumper wire JW, if the relief valve of the work vehicle is switched to the set pressure of 150 Kg / cm ² to raise the pressure oil, the sequence valve 2 operates and the circuit is activated as shown in the hydraulic circuit diagram of FIG. Is switched, and pressure oil enters the chamber c from the A ₄ port of the hydraulic cylinder 4 for isolation. When the pressure oil enters the chamber c, the rod of the isolation hydraulic cylinder 4 moves to the right, and in synchronization with the movement of this rod, the gripping portion 1b fixed via the insulator 3 holds the jumper wire JW to the right. Move in the direction (see Fig. 6). At that time, the pressure oil in the d chamber returns from the check valve 6a on the left side of the stop valve 6 to the drain circuit on the working vehicle side via the solenoid valve 8.

As shown in FIG. 6, the stroke of the isolation hydraulic cylinder 4 needs to have a length to ensure insulation of the cut jumper wire JW, but in the next step (jumper wire JW cut into sleeves). It is desirable to have a length that allows the sleeve to be inserted in the process of inserting and abutting, and connecting the cut jumper wires JW by compressing the sleeve).

Further, since the rod of the hydraulic cylinder for isolation 4 and the grip 1b are fixed via the insulator 3, the grip 1a and the grip 1b are fixed.
Is completely insulated.

When the edging work is completed, the electromagnetic valve 8 (see FIG. 4) on the work vehicle side is switched to the neutral position, and the couplers 7a, 7b connecting the edging and gripping tool side and the work vehicle side are disconnected,
Move on to the next process.

By the way, if the pressure oil returns and the heads of the grips 1a and 1b open after the couplers 7a and 7b are separated, or the isolation hydraulic cylinder 4 contracts, it is very dangerous because it is live work. For this reason, the edge-cutting gripping tool of the present invention is provided with a counterbalance valve 5 in the hydraulic circuit on the gripping portion side to prevent backflow.

The counter balance valve 5 is designed so as not to open unless the pressure reaches a certain value (this pressure is called back pressure). For example, the back pressure of the counter balance valve 5 is 30 Kg / cm ²
Even if oil is leaked from the couplers 7a, 7b, the counter balance valve 5 will not open if the oil is leaked from the couplers 7a, 7b. Does not shrink. Note that if the set pressure of the valve is set high, the effect of preventing reversion will be high, but after the work is finished, the pressure source on the work vehicle side should be set higher than its back pressure to open the counterbalance valve 5. Therefore, in the embodiment of the present invention, the pressure is set to about 30 kg / cm ² .

As described above, the preventive measure against the backward movement of the edge gripping tool of the present invention has a double safety structure by providing the counter balance valve 5 in addition to the oil leakage prevention by the couplers 7a and 7b.

Next, a case where the edge cutting and gripping tool is removed from the jumper wire JW will be described.

After connecting the hose on the side of the work vehicle and the hose of the edge gripping tool with the couplers 7a and 7b, as shown in FIG.
When switching the pressure oil from the B ₁ 'port of the solenoid valve 8 (about 10
0 kg / cm ² ) flows into the circuit, pressure oil enters the chamber b from the B ₂ or B ₃ port of the gripping cylinders 11a, 11b, the piston descends, and the heads of the gripping portions 1a, 1b move in the opening direction. At this time, a
The back pressure generated in the room is 100 kg / cm ² × (the cross-sectional area of chamber b / the cross-sectional area of chamber a), and
The oil in the room returns from the A ₂ or A ₃ port to the A ₁ ′ port of the work vehicle side solenoid valve 8 by opening the counter balance valve 5.

If the edge gripping tool is removed from the jumper wire JW,
Next, the isolation hydraulic cylinder 4 is contracted. That is, if the stop valve 6 of the edge-cutting gripping tool is used in the open state, the hydraulic cylinder 4 for isolation is contracted at the same time when the gripping part is opened. However, when the isolation interval is used, the stop valve 6 is closed. When the operator opens the stop valve 6 after removing the tool from the electric wire by opening the gripping portion 2 by using the state, the pressure oil flows from the B ₄ port of the isolation hydraulic cylinder 4 into the d chamber, The hydraulic cylinder 4 for isolation contracts. Further, the oil in the c chamber returns to the A ₁ ′ port via the counter balance valve 5, and the operation of the edge cutting and grasping tool is completed.

[Effect of device]

As described above, according to the present invention, a pressure control valve for switching the circuit when the hydraulic pressure reaches a predetermined set value, and a hydraulic circuit on the primary side of the pressure control valve, which is provided in the hydraulic circuit, is provided with an object to be grasped such as an electric wire. Two grips for gripping or opening two points on the axis by extension and contraction operations of the hydraulic cylinder, and two of the pressure control valves.
Provided in the hydraulic circuit on the next side, the two gripping parts are connected to the rod side and the base end side via an insulator, respectively, and reciprocate in the axial direction of the gripped object through switching of the pressure control valve. Since it is configured to have a hydraulic cylinder for performing,
After cutting the object to be grasped, it is possible to safely and promptly perform a series of operations of separating the object to be held by a certain distance and completely insulating it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an edge cutting and gripping tool according to an embodiment of the present invention, FIG. 2 is a side view of the tool, and FIGS. 3 to 5 are hydraulic circuit diagrams according to the present invention. , FIG. 6 is a front view when the tool separates the object to be grasped, and FIG. 7 is an explanatory diagram of indirect live work for the transmission and distribution lines. 1a, 1b …… Grip part, 2 …… Pressure control valve, 3 …… Insulator,
4 ... hydraulic cylinder, 5 ... counterbalance valve, 6
...... Stop valve, 7a, 7b ...... Coupler, 8 ...... Solenoid valve.

Claims (1)

[Scope of utility model registration request] 1. A pair of gripping parts in which a gripping cylinder is connected to a base end of a clamp for gripping an object to be gripped such as an electric wire, a hydraulic cylinder for isolation in which an insulator is fixed to a tip of a rod, and a hydraulic pressure. Is an edge-cutting gripping tool composed of a pressure control valve for switching the circuit when the pressure reaches a predetermined set value, and the gripping portion provided in the hydraulic circuit on the primary side of the pressure control valve allows an electric wire, etc. The two points on the axis of the object to be grasped are grasped or released by the extension and contraction operations of the grasping hydraulic cylinder, and the rod of the isolating hydraulic cylinder provided in the hydraulic circuit on the secondary side of the pressure control valve. Side and the base end side are connected to the bases of the pair of gripping parts, and reciprocating motion is performed in the axial direction of the object to be gripped through switching of the pressure control valve, and the primary side and the secondary side hydraulic circuits are connected. A cover for preventing pressure oil Edge cutting gripping tool, characterized in that connected to the hydraulic source through the centers balance valve.