JPH07118857B2 - Cable jacket cutting tool - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tool for automatically cutting and stripping a coating layer of a power cable, particularly a rubber or plastic cable end portion.

[Prior Art] A power cable, for example, a cross-linked polyethylene (CV) cable, is manufactured in a multilayer structure in which an outer periphery of a conductor is sequentially covered with an insulating layer, an outer conductive layer, a shielding layer, a sheath, and the like. To connect these cables, a so-called step stripping operation is performed in which the coating layers are sequentially cut and removed at their ends.

This cutting work has a multilayer structure from the cable, the material used and the thickness are different, and since the outer coating layer on each lower side is easily damaged, a skilled jointer has used a knife or the like until now. The current situation is that it is carried out manually using.

Further, a dedicated hand tool for a specific coating layer, for example, a hand tool for cutting an outer conductive layer and an insulator is also used in combination with a knife. Further, since the sheath and the insulator have a thick coating layer, it is difficult to cut them manually, and they are heated and softened by a gas burner or the like. This heating and softening is necessary especially when the outside air is low in temperature such as in winter.

The specific work procedure for each layer is to cut the circumference of the cable at one or two places, and then cut the cable in the longitudinal direction at one or two places to perform stripping work of a required length.

[Problems to be Solved by the Invention] In this way, in the step stripping work in the cable connection, it is first difficult to pull up the cable to a height where it is easy to work at the connection site, and it is inevitably a work near the ground. I will end up. For this reason, there is a problem that work under the cable such as a knife becomes extremely difficult, a working posture is bad, an injury is caused by the knife, and an accurate cutting dimension cannot be obtained.

Further, recently, from the viewpoint of disaster prevention, there are many cases where the use of fire is prohibited, and manual work is becoming quite difficult.
Furthermore, it is predicted that there will be social problems such as a shortage of skilled workers for distribution cables and the like, which require a large amount of work, and the need to cut off traffic to increase the work time significantly.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a cable coating cutting tool capable of automatically performing a cable coating cutting operation.

[Means for Solving the Problem] In the present invention, a tool base having a notch portion for inserting a cable and supported by a rail on a frame so as to be movable in a cable longitudinal direction, and a tool base rotatably provided on the tool base. Rotating the above-mentioned cutting blade unit, and a cylindrical rotation base provided with a movable part supported and moving itself orthogonally to the center and a cutting blade unit having a plurality of cutting blades rotatably provided on this movable part. The rotation base of the rotary base is composed of a cylinder body that has a drive source that rotates around a rotating shaft to select the cutting blade and a stopper that fixes the cutting blade, and presses the cutting blade unit toward the center. A cable characterized in that by moving the tool base in the longitudinal direction of the cable, the cable coating layer is cut and removed at two circumferential positions and at least one longitudinal direction for each cable coating layer. It is a coating cutting tool.

[Operation] With the cable coating cutting tool thus formed, the cable coating layer is removed by sequentially cutting two circumferential cuts and one or more longitudinal cuts for each cable coating layer. Good stripping work is easily possible.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a cable coating cutting tool, and FIG. 2 is a sectional view thereof. Left and right frames 1 with guide rails 1 and 1
A box-shaped tool base 5 fitted with the guide rails 1 and 1 and having a cable insertion portion 9 is attached between 00 and 100, and the drive sources 3 and 3 for traveling are fixed to the tool base 5, and the output The drive gears 4, 4 provided on the shaft are configured to mesh with the gear rails 2, 2 provided on the frames 100, 100.

With this configuration, the tool base 5 can be moved forward and backward (up and down in FIG. 2) by supplying power or air to the driving sources 3 for traveling. This drive source
3,3 may be one place. Alternatively, the drive gears at two locations may be rotated by the drive source at one location. In this case, it is preferable to use a flexible shaft.

Inside the tool base 5, a rotary base 8 having an H-shaped cross section having a cable insertion portion 9 ′ communicating with the tool base 5 is rotatable via bearings 6, 6 ... and mounting screws 7, 7. It is provided in. A tooth portion 8a is provided at the bottom of the rotation base 8, and is formed so as to rotate by meshing with a gear 12 at the tip of an output shaft 11a of a rotation drive source 11 fixed to the tool base 5. The cylinder body 15, 15 is provided on the bottom of the rotary base 8 via the two slide bases 13, 13 so as to face the center of the cable insertion portion 9 '.
One ends of 5'and 15 'are fixed to stoppers 14 and 14 attached to the inner surface of the rotary base 8. Although not shown, a supply pipe for supplying air or hydraulic pressure is connected to the cylinder main bodies 15, 15, and when the air or hydraulic pressure is supplied, the cylinder main bodies 15, 15 respectively move toward the center.

A rotary shaft 19 communicating with the cutting blade unit 16 is rotatably fixed to each cylinder body 15 via a bearing 20, and a rotary drive source 17 of the cutting blade unit 16 is connected to the rotary shaft 19. This connecting means may be either belted or geared. Further, the rotating shaft 19 is provided with a stopper 18 fixed to the cylinder body 15 in order to prevent malfunctions during traveling and rotation. The stopper 18 may be formed by a means for fixing the cylinder shaft 15 ′, which is moved by air or hydraulic pressure and is connected to a hole 19 a provided in the rotary shaft 19, or a fixing means for fixing using an electromagnetic brake.

The cutting blade unit 16 includes a rotating disc-shaped circumferential cutting blade 21 for circumferentially cutting the coating layer of the cable 10 as shown in an enlarged view in FIG. 3, and a holder enlarged in FIG. The plate-shaped lengthwise cutting blades 22 fixed to 23 are alternately arranged. These cutting blades 21, 22 are used for the cable 10
Since there are various insulating layer thicknesses, parallel parts 21a,
23a and blades 21b and 22a are divided, and a plurality of blades are formed so that the height of the blades 21b and 22a is the same as the thickness of the double coating of the cable 10 to be cut (four in each figure). Has been done. The end portion of the holder 23 may be used as the parallel portion 23a of the lengthwise cutting blade 22.

Next, referring to FIG. 5 (A), the procedure for peeling off the cable coating with the cable coating cutting tool thus formed will be described.
This will be described with reference to (B) and (C). First, the cable 10 to be cut is connected to the cable insertion portion 9 of the cable coating cutting tool,
Fix in the center through 9 '. This fixing is performed by providing an arbitrary cable clamp device (not shown) driven by hydraulic pressure, air, a motor or the like in front of and behind the cable sheath cutting tool.

Next, the left and right circumferential cutting blades 21 suitable for the thickness of the cable coating layer to be cut are selected by rotating the rotary drive source 17, and the tip of the stopper 18 is fitted into the hole 19a of the rotary shaft 19. To fix. The tool base 5 is moved to the first cutting position P of the cable 10 by the drive sources 3 and 3 via the gears 4 and 4 gear rails 2 and 2. Then, air or hydraulic pressure is supplied to the cylinder bodies 15 and 15 to apply pressure, and the output shafts 15 ′ and 15 ′ are actuated to pressurize the cutting blade units 16 and 16 to the coating layer of the central cable 10, In this state, the drive source 11 of the rotary base 8 is actuated to drive the rotary base 8 through the gears 12 and 8a.
Rotate by one degree to cut the first coating layer of the cable 10 into a circle. At this time, the pressure of the cylinder bodies 15 and 15 may be changed depending on the material of the coating layer to be cut, and rotation may be repeated to cut.

When this cutting is completed, the cutting blade units 16 and 16 are pulled up, and then the tool base 5 is moved to the second cutting position Q by operating the drive sources 3 and 3 via the gears 4 and 4 and the gear rails 2 and 2. , Perform the same operation to set the first and second positions P and Q of the cable 10 to 2
Complete the circumferential cutting of the part.

Next, the lengthwise cutting blade 22 adapted to the thickness of the coating layer of the cable 10 is selected by driving the rotary drive source 17 of the cutting blade unit 16, and fixed in the same manner as the circumferential cutting blade 21 with the stopper 18. . Then, the tool base 5 is positioned at one of the first circumferential cutting positions P. Then the cylinder body 15,15
Pressure is applied to the cutting blade units 16 and 16 against the coating layer of the cable 10, and in this state, the tool base 5 is actuated by the drive sources 3 and 3 to move to the second circumferential cutting position Q and the length is changed. Cut in the direction. After this cutting, the cutting blade unit 16 is lifted to complete the cutting of the first coating layer. In addition, in this example, the case where the upper and lower two places are cut has been described, but the cutting may be performed only at one place. And the second such cutting
Third, ... Sequentially for each coating layer. That is, the coating layer of the cable 10 is sequentially cut by performing two circumferential cuts and then successively cutting at least one upper and one lower cut between these two circumferential cutting positions in the longitudinal direction. The coating layer can be removed by. This removal will fall naturally if the coating layer is completely cut. If a minute uncut portion remains due to the manufacturing tolerance of the coating layer, it can be easily peeled off by hand or by inserting a spatula or the like into the cut surface.

The above-mentioned means is carried out for each coating layer such as the sheath, the shielding layer, the outer conductive layer, the insulating layer, etc. to perform the step stripping work, and finally, as shown in FIG. 3 (C), separately provided. The conductor cutting device (not shown) cuts the conductor 10a to complete the step stripping operation.

In the above example, the case where two cutting blade units are provided on the rotary base has been described, but it goes without saying that one cutting blade unit may be rotated 360 degrees to perform circumferential cutting. . Further, the cutting in the longitudinal direction may be performed from the second circumferential cutting position to the first circumferential cutting position.

[Effect of the Invention] Since this cable-covered cutting tool can fix the front and rear of the cable to be stripped, it is possible to perform accurate cutting without being affected by the bending of the laid cable. And this cutting is 2 places in the circumference and 1 in the length direction.
Since it is a simple procedure to repeat the above steps, it is extremely easy to sequence program each drive source, and it is possible to form it so as to operate automatically.
By changing the pressure of the cylinder body, it is possible to change the cutting depth even in the middle of cutting.

In addition, the stripped condition of the cable can be visually confirmed from the outside of the tool, allowing quick response to malfunctions.
Furthermore, it is easy to use it in combination with manual work.

It is also possible to provide a cable centering device in the form of, for example, a guide roller on the rotation base or the tool base, and add a wind pressure removing device or the like through error piping.

[Brief description of drawings]

1 and 2 are a front view and a cross-sectional view of a cable-coated cutting tool showing an embodiment of the present invention, FIG. 3 is a side view for explaining cutting with a circumferential cutting blade, and FIG. , Fig. 5 is a side view for explaining the cutting by the lengthwise cutting blade, and Figs. 5 (A), (B), and (C) are side views showing the procedure for cutting the cable coating. 1 …… Guide rail 2 …… Gear rail 3 …… Running drive source 4 …… Gear 5 …… Tool base 8 …… Rotation base 9,9 ′ …… Cable insertion part 10 …… Cable 11 …… Rotation drive source 13 …… Guide base 15 …… Cylinder body 16 …… Cutting blade unit 18 …… Stopper 21 …… Circular cutting blade 22 …… Longitudinal cutting blade

Claims (3)

[Claims] 1. A tool base having a notch for inserting a cable and supported by a rail on a frame so as to be movable in the cable longitudinal direction, and a tool base rotatably supported by the tool base and orthogonal to the center thereof. And a movable base on which the movable body moves, a cylindrical rotary base provided with a cutting blade unit having a plurality of cutting blades rotatably provided on the movable base, and a rotary shaft that rotates the cutting blade unit. And a stopper for fixing the cutting blade, and a cylinder body for pressing the cutting blade unit toward the center. The rotation base is rotated and the tool base is moved in the cable longitudinal direction. The cable coating layer is applied in the circumferential direction 2 for each coating layer.
A cable coating cutting tool characterized by cutting and removing one or more points in the longitudinal direction. 2. The cable-coated cutting tool according to claim 1, wherein a plurality of disc-shaped and flat-plate-shaped cutting blades are alternately provided on the periphery of the cutting blade unit. 3. The cable-coated cutting tool according to claim 1, wherein the height of the cutting blade is the same as the thickness of the coating layer of the cable to be cut.