JPH03183313A - Earthing lace and its manufacturing equipment - Google Patents

Abstract

PURPOSE:To simplify complicated works by laying a insulated wire at the inner surface of a synthetic resin earthing lace in the longitudinal direction in its full length and by covering and supporting this insulated wire with a covering extrusion-molded as integral to the earthing lace. CONSTITUTION:An insulated wire 1 is laid at the center of an earthing lace with an arc-shaped cross-section in its full length, and covered with a synthetic resin, and this covering 2 is provided with a slit over its full length. For example, the earthing lace cut to about 3.3m long, is prepared, and, in the site, the insulated wire 1 is connected to an earthing wire led down from a distribution system in a position higher than a level where parssers by can touch, and its joint is insulated. Then, the earthing lace M, while applied onto the surface of a mast, is secured by steel bands, and the lower end of the insulated wire 1 is connected to an earthing rod.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an earth mold with a conductor for grounding electric wires drawn out from various electrical devices on utility poles, and an apparatus for manufacturing the same.

[Conventional technology and its issues]

As shown in FIGS. 9 and 10, a grounding wire P is pulled down from various electrical devices on the utility pole H, and the wire P is made of hard polyvinyl chloride (PVC) with a pipe shape or a concave cross section.
C) is covered with Earth Mall M. This work is
In the case of a pipe shape, the electric wire P is passed through the earth molding M and attached to the utility pole H. In the case of a concave cross section, the electric wire P is attached to the utility pole H and the earth mold M is placed on top of it (the 10
In both cases, the earth mold M is fastened with a steel band, etc., which is a complicated process, and improvements have been desired.

Therefore, an object of the present invention is to simplify the above-mentioned complicated work and to make it possible to clean, for example, a TM mounting post, and to provide an apparatus for manufacturing such an earth mold.

[Means to solve the problem]

In order to solve the above problems, in the present invention, an insulated core wire is attached to the entire length of the inner surface of a synthetic resin type earth molding having a concave cross section and continuous in the length direction. of,
It is constructed so that it is covered and held integrally with the earth mold by an extrusion molded outer cover.

A slit extending to the insulated core wire can be formed in the jacket over its entire length.

In the manufacturing apparatus according to the present invention, an extrusion molding die having a land having a crescent-shaped or flat trapezoidal cross-sectional inner surface is attached to the crosshead of the extrusion molding machine, and the center is placed inside the die. A nipple through which the insulated core wire passes is arranged so that a required resin flow path is formed between the surrounding dice, and the nipple is in contact with the base surface of the crescent or flat trapezoid on the inner surface of the die land, A pair of resin flow suppressing blades with a required gap between the other surface and the insulated core wire are provided symmetrically with respect to the insulated core wire.

The nipple may be provided with a resin flow suppressing protrusion located between the resin flow suppressing blades and in contact with the bottom surface of the inner surface of the die land and the insulated core wire.

The lengths of the resin flow suppressing blades and the protrusions are appropriately selected within a range that allows manufacturing an earth mold with a desired cross-sectional shape.

A sizing die can be placed close to the downstream side of the extrusion molding die, and the sizing die has a land having the same axis and the same cross-sectional shape as the land of the extrusion molding die, and a cooling A tube may be attached.

Furthermore, on the downstream side of the sizing die, a wire pulling machine from the sizing die and a fixed length cutting machine into which the wire from the pulling machine is continuously fed can be installed in order, and the fixed length cutting #fT The machine can have the following configuration:

A guide jig having a guide hole through which the earth mold from the above-mentioned pulling machine is fed is attached to the frame, and a cutting process is performed to cut the traveling earth mold on the frame at the latter stage of the earth mold passing direction of this jig. A machine is installed to cut this
The downstream frame in the earth mold penetration direction of the T machine is provided with a U-shaped box rail with a downward, sideways, or sideways opening in the penetration direction, and the back surface of this box rail is aligned with the axis in the earth mall penetration direction. At the same time, an earth mold retention means is provided at the opening of the box rail, and the cutter is provided with a retention means for the earth mold when the earth mold passes through the through hole of the guide jig to a required length. A fixed length cutting machine comprising means for moving in the opening direction.

[Effect]

When the earth mold with a conducting wire according to the present invention configured as described above is attached to a utility pole, for example, an electric wire is attached at the same time. For this reason, both ends of the electric wire are connected to the down-conductor from the electrical equipment on the utility pole, and are grounded via a grounding rod or the like.

For those with a slit, when processing the terminal, a required length of insulated wire is pulled out from the slit, and most of the drawn-out earth molding is cut and removed.

In addition, in the manufacturing apparatus, the resin pressure exiting the die is suppressed by the resin flow suppressing wings and protrusions, and the above-mentioned earth mold with conducting wire is manufactured.

In cases where a sizing die is provided, the extruded earth mold is cooled and hardened while being shaped by the die.

In addition, if a take-off machine and a standard-length cutting machine are installed, the earth mold from the sizing die is fed into the guide jig of the standard-length cut-off machine via the take-off machine, and then advances within the box rail through the cutting machine. . When the amount of progress reaches the required length, the cutter makes one cut to cut the earth molding. At this time, the earth mold is pushed toward the opening of the box rail, so the cutting machine side of the earth mold within the box rail moves toward the opening, creating a space on the feed shaft of the earth mold. Therefore, the next Earth Mall sent in enters that space and advances while pushing the Earth Mall in front of it. This action is repeated, and the earth mold that has reached the opening of the box rail is discharged downward from the opening.

〔Example] 3 Ki, Ki Earth Mall First, the earth mold with conductor wire will be explained.

Figure m1 shows a major example of this, in which an insulated core wire 1 is attached to the entire length of the inner surface Φ center of the earth mold having an arc-shaped cross section, and this insulated core LA
1 is coated with a synthetic resin, and a slit 3 extending over the entire length is formed in the coating (outer cover) 2. When the outer covering 2 is made of a soft compound, the earth molding can be easily cut and peeled off, so there is no need to intentionally provide the slits 3.

This embodiment has the above-described configuration, and is cut in advance to a total length of, for example, around 3.3 m in a factory, and then placed at a location higher than the reach of passersby on a grounding wire pulled down from the distribution line system at the site. Then, the insulated core wire 1 is connected, and the connection portion is insulated.

Thereafter, the earth mold M is pulled down while applying the bottom side of its cross section to the surface of the utility pole, and is fixed by tightening with a steel band at appropriate intervals, and the lower end of the insulated core wire 1 is connected to the earth rod.

In addition, since ribs are provided on both edges 2a of the outer wt2 to make it thick, the strength is increased, and the distribution of extrusion pressure during extrusion molding described later is made uniform to suppress deformation due to expansion and contraction of the resin. , and can prevent warping. Earth Mall (
The cross section of the outer sheath can adopt various known shapes such as the shape shown in FIG. 2 and the trapezoidal shape shown in FIG. 10.

Next, the manufacturing equipment for each of the earth molds M will be explained.

In this embodiment, as shown in FIG. 3, an insulated core wire 1 is sent from a supply A to an extrusion molding machine B and coated with an outer sheath 2 to form an earth mold M with a conducting wire, and the earth mold M is
The sizing die C1 is run through a cooling tank D, a take-up machine E, and a fixed-length cutting machine F to manufacture an earth mold M with a fixed-length conducting wire, and the process is controlled by a control panel G.

As shown in FIG. 4, the extrusion molding machine B has a die holder DH of the crosshead CH of the extrusion molding machine with an inner cross-sectional shape of a crescent shape or a flat trapezoid shape.
An extrusion molding die 5 having a land 4 having the external cross-sectional shape shown in the figure (see the chain line in FIG. 5) is mounted. This die 5 is aligned by adjusting the screwing amount of bolts r placed at equal intervals around the periphery.

Inside the die 5 and the die holder DH, a nipple 6 through which the insulated core wire 1 passes is arranged around the nipple 6 so that a required resin flow path 7 is formed between the die 5 and the die holder DH. This nipple 6 is nipple holder N
The tip position of the nipple 6 is adjusted by adjusting the screwing amount of the bolt f of the nipple holder NH. Therefore, by moving the nipple 6 back and forth as shown by the arrow a in the figure, the size of the resin flow path 7 can be adjusted. and set accordingly.

A pair of resin flow suppressing blades 8 shown in FIG. 5 are protruded from the front surface of the nipple 6, and when the nipple 6 is attached to the nipple holder NH, the suppressing blades 8 touch the crescent bottom surface of the inner surface of the die land 4. (See the chain line in FIG. 5, bottom surface: reference numeral 4a), has substantially the same gap t as the other surface and the insulated core wire 1, and its tip protrudes downstream (+!!I) from the front end of the land 4. Furthermore, a protrusion 8a is provided between both resin flow suppressing blades 8 to protrude from the nipple 6, and this protrusion 8a is in contact with the die land 4 and also with the insulated core wire 1.

The amount of protrusion of the suppressing blades 8 and the protruding ridges 8a is determined appropriately through experiments, taking into account the temperature of the resin a, the extrusion pressure, etc. The setting is to make the #IA oil flow suppression control 8 and the protrusion 8a movable in the axial direction with respect to the nipple 6 by fitting etc., and to move only them in the axial direction, or to move them integrally with the blade 8 and the protrusion 8a. This is done by moving the nipple 6 in its axial direction.

On the downstream side of the extrusion die 5, a sizing die C is arranged close to it. This die C has a land 9 having the same axis and the same cross-sectional shape as the land 4 of the die 5.
is formed, and a cooling pipe 10 is attached. Water at an appropriate temperature flows through the cooling pipe 10, and the dice C are cooled by this warm water. In addition, the land S is coated with a tetrafluoroethylene polymer (for example, manufactured by DuPont, USA, trade name: Teflon) 9a, and this coating layer allows the earth mold M to move smoothly after extrusion molding. .

This extrusion molding machine B has the above configuration, and is currently receiving 1S
By taking over the IE, as shown in FIGS. 4 and 5, the insulated core wire 1 is fed onto the central axis of the nipple 6, and the resin a having the composition shown in Table 1 below is supplied to the flow path 7. Then, as in a general extrusion molding machine, the insulated core wire 1 is covered with the outer sheath 2 having a cross-shaped inner surface of the land 4, and the outer sheath 2 is The earth mold M, in which both sides of the insulated core wire are missing, that is, the first
The earth molding M with a conducting wire shown in the figure is extruded.

Table 1 Note that the width of the slit 7 is determined by the width of the protrusion 8a, so in the case of the above-mentioned hard compound, the width is determined by considering the extent to which the insulated wire 1 can be pulled out. Also, if the protrusion 8a is integrated with both resin flow suppressing blades 8 (dashed line in Figure 2)
, the earth mold M has the cross-sectional shape shown in FIG.

The earth mold M formed by the extrusion molding machine B and the sizing die C as described above has a cold JJ1+fi
It passes through D and is then collected by a collection machine E. However, this drawing machine E has a well-known structure, and as mentioned above, by this drawing action, the insulated core wire 1 is fed from the supply A onto the central axis of the nipple 6 of the extrusion molding machine 8, and as described above, Extrusion molding is performed.

The earth mold M taken up by the taking-offs JR and E is sent to the downstream cutting machine mF. As shown in FIG. 6, this fixed length cutting machine F is provided with a square box column 12 at one end of a machine base (device frame) 11, with the outlet and entrance of the earth molding M open. A cut surface 13 is provided on the heel 12b on the inner surface of the portion 12a so as to be slidable after +iil with respect to the course of the earth molding M (in the direction of the arrow).

A blade receiver ( ) 15 serving as a guide jig for receiving the earth mold M is fitted into the cut surface 13 upstream of the path of the earth mold M so as to be adjustable in forward and backward movement by a clearance adjustment pad 18 . Note that 18a is a washer, and 18b is a lock nut. After adjusting the clearance between the blade 17 and the blade rest 15, which will be described later, the blade rest 15 is fixed with the lock nut 18b.

A square hole 13a is formed in the vertical direction of the center of the cut surface 13 to slidably receive the blade support rod 14.

The blade support rod 14 has the shape shown in FIG. 8, and is fitted from the lower part of the square hole 13a, so that the lower protrusion 14a hits the lower surface of the cut surface 13 to prevent it from passing through.

When the blade support rod 14 is inserted into the cutting surface 13, the pin 19a is inserted into the pin hole 14b of the blade support rod 14, and the pin 19a is inserted into the pin hole 14b of the blade support rod 14.
A torsion spring 19 is interposed between the side protruding end and the upper surface of the cutting surface 13, and the blade support rod 14 is pulled up. A dovetail groove 14c is provided on the surface of the blade support rod 14 facing the blade receiver 15.
A blade (cuckoo) 17 with an outline of a dovetail and a dovetail pattern is fitted therein. Note that 16 is an anvil.

On the downstream side of the cut surface 13, ground molding guide surface rails 22 (hereinafter referred to as box rails) having a U-shaped cross section are arranged in series, and the ground moldings M are connected to the box rails 22 at appropriate intervals in the length direction. The spring 27 for retaining inside the box rail 2
It is attached so that it can sandwich the opening of 2. This box rail 2
2. On one end side of the inner surface (the side of the blade receiver 15 on the right side of Fig. 6), there is a seventh
As shown in Figure (al), a rib 26 is provided at a distance of 1 minute (see Figure 1) from the back surface of the earth mold M, and this rib 26 allows the cutter 17 to be The return upward when the earth mold M is lowered is blocked.A cutting length setting piece 25 is provided on the other end side of the box rail 22 so as to be movable and fixed in the length direction. 25 is screwed at the required position, and when the earth mold M is fed into the box rail 22 and its tip hits the setting piece 25, the box rail 22 and the cut surface 13 move as the earth mold M advances. 23 is a support roller for the box rail 22.

A cross stroke mechanism 21 is provided at the top of the square box column 12, and the hammer 20 is constantly reciprocated up and down by this mechanism 21. In the cross-stroke mechanism 21, an eccentric shaft 21C fixed to the central shaft 21a of the flywheel W which is constantly rotating is fitted into a hole in the slider 21b in the bronck 20a of the hammer 20, and the rotation of the eccentric shaft 21c As a result, the slider 21b moves laterally as shown by the chain line in FIG. 6, and also moves vertically to push down the block 20a, that is, the hammer 20. Therefore, when the upper surface of the anvil 16 faces below the hammer 20 (
6), the upper surface thereof is struck by the hammer 20, the anvil 16, that is, the blade support rod 14 is lowered, and the earth mold M is cut.

This length cutting machine F has the above-mentioned configuration, and when starting work, first, as shown in FIG. This prevents the earth mold M from being bent when the tip of the earth mold M to be sent in next comes into contact with the cutting length setting piece 25.

From this state, when the earth molding M is fed into the sword holder 15 from the take-up [E], the earth molding M enters the box rail 22 and hits the cutting length setting piece 25, and through the setting piece 25, the spring 24 The box rail 22 and the cut surface 13 are moved to the left in FIG. Is this movement outside? Since I12 is made of hard resin, the earth molding M can be bent without bending. If the amount of movement is a certain amount, that is, the length of the feed from the blade 17 is 3.3 m, for example,
As shown by the chain line in the figure, the anvil 16 is positioned below the hammer 20 and is struck, the blade support rod 14 is lowered, and the earth mold M is cut into a regular length by the blade 17 and the blade receiver 15.

During this cutting, the blade 17 pushes the earth molding M downward, so that the cut surface 13 side of the earth molding M in the box rail 22 descends, and this state is maintained by the ribs 26, as shown in FIG. 7(a). and the space S is at the feeding level of the earth mall M.
occurs. Therefore, after cutting, the spring 24
The box rail 22 and the cut surface 13 return to their original positions, but as they do so, the next earth mold M enters the space S (Fig. 7(a)) and advances while pushing down the earth mold M in front of the ML as shown by the chain line. When this action is repeated, the earth mold M facing the lower opening of the box rail 22 pushes open the claw 27a of the spring 27 from the opening and is successively ejected into the machine base 11 (as shown by the chain line a in Fig. 7). ).

In this fixed length cutting mF, the cross stroke mechanism 21
Instead, an air cylinder, 'rIj, or magnetic plunger plunger drive machine can be employed.

In addition, when the earth mold M is extruded with its long sides vertical (up and down), the length cutting machine F is placed horizontally, the cross stroke mechanism 21 is horizontal, and the opening of the box rail 22 is oriented horizontally. .

〔Effect of the invention〕

Since the earthing molding with a conducting wire according to the present invention is configured as described above, it is possible to simultaneously attach the earthing wire and the earthing molding for covering the wire, thereby greatly improving workability. If the slit is provided, the electric wire can be easily pulled out from the earth molding and protruded in the length direction, and connection terminal processing becomes easy.

Furthermore, the manufacturing apparatus according to the present invention has the advantage that the earth mold can be manufactured smoothly and without deformation.

Furthermore, if a pulling machine and a fixed-length cutting machine are installed, the earth molding can be made to a fixed length.In this case, if the fixed-length cutting machine is equipped with a box rail, etc. Since the cut earth mold is supported and dispensed appropriately, there is no need for a person to be present all the time, and costs can be reduced.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of respective embodiments of the earth mold with conductor according to the present invention, FIG. 3 is a schematic diagram of an embodiment of the manufacturing apparatus of the same embodiment, and FIG. 4 is a diagram of the third embodiment. 5 is a horizontal sectional view of the main part of the extrusion molding machine, FIG. 5 is a perspective view of the nipple in FIG. 3, and FIG.
The figure is a cutaway front view of the main part of the standard length cutting machine in Figure 3, Figure 7 is a cutaway right side view of Figure 6, and (a) is a cross section taken along line A-A.
The figure (b) is the BB cross section, Figure 8 is a perspective view of the blade support rod and blade in Figure 6, Figure 9 is an explanatory diagram of the installation of the grounding wire on the utility pole, and Figure 10 is the X in Figure 9. - It is an X-ray sectional view. M...earth mall, H...T1.
Pillar, A: Supply, B: Extrusion molding machine, C: Sizing die, D: Cooling tank, E: Pick-up machine,
F: Fixed length cutting machine, G: Control panel,
CH...Cross head, DH...Dice holder NH...Nipple halter...Insulated core wire, 2...Outer cover, 3.
...Slit, 4...Dice land, 5...Dice, 6...Nipple, 7...Resin flow path, 8... ...
Resin flow suppression wing, 8a...Resin flow suppression protrusion, 9...Sizing die land, 9a...
... Coating, 10 ... Cooling pipe, 11 ... Frame, 12 ... Square box column, 13 ...
・Cut surface, 14...Blade support rod, 15...
...Blade holder, 16...Anvil, 17...
... Cutter (blade), 18 ... Adjustment nut, 1S ... Toshigon spring, 20 ...
... Hammer 21 ... Cross stroke mechanism, 22 ...
・・Kankeijo, 24・・・・Spring 25・・・・
...cutting length setting piece, 26...rib, 27...spring 27a...claw. ng, ng,

Claims (9)

[Claims] (1) An insulated core wire 1 is attached to the entire length of the inner surface of a synthetic resin earth mold whose cross section is concave and continuous in the length direction, and this insulated core wire 1 is extruded integrally with the earth mold. An earth mold with a conducting wire, which is coated and held with an outer sheath 2. (2) The earth mold with a conducting wire according to claim (1), characterized in that a slit 3 extending to the insulated core wire 1 is formed over the entire length of the outer sheath 2. (3) Attach the extrusion molding die 5 in which the land 4 having a crescent-shaped or flat trapezoidal inner cross-sectional shape is formed to the crosshead CH of the extrusion molding machine B, and place the insulated core wire in the center inside the die 5. A nipple 6 through which 1 passes through is arranged so that a required resin flow path 7 is formed between the surrounding dies 5, and the nipple 6 has a base surface of the crescent or flat trapezoid on the inner surface of the die land 4. 4a, a pair of resin flow suppressing blades 8 having a required gap t from the other surface and the insulated core wire 1 are provided symmetrically with respect to the insulated core wire 1. manufacturing equipment. (4) The nipple 6 is provided with a resin flow suppressing protrusion 8a located between the resin flow suppressing blades 8 and in contact with the bottom surface 4a of the inner surface of the die land 4 and the insulated core wire 1. An apparatus for manufacturing an earth mold with a conducting wire according to claim (3). (5) Claim (3) characterized in that the resin flow suppressing blade 8 protrudes downstream from the front end of the die land 4.
) or (4), the manufacturing device for an earth mold with a conducting wire. (6) In the apparatus for manufacturing an earth mold with a conducting wire according to any one of claims (3) to (5), a sizing die C is disposed adjacent to the downstream side of the extrusion molding die 5; The sizing die C has a land 9 having the same axis and the same cross-sectional shape as the land 4 of the die 5, and a cooling pipe 10 is attached thereto. (7) In the apparatus for manufacturing an earth mold with a conducting wire according to claim (6), the resin flow suppressing blade 8 is formed by a sizing die C.
An apparatus for manufacturing an earth mold with a conducting wire, characterized in that the wire extends into the land 9 of the earth mold. (8) In the apparatus for manufacturing an earth mold with a conductor according to claim (6) or (7), on the downstream side of the sizing die C, there is provided a wire pulling machine E from the sizing die C, and a wire pulling machine E from the wire pulling machine E. A manufacturing device for an earth mold with a conducting wire, which is equipped with fixed length cutting machines F to which P is continuously fed. (9) The apparatus for manufacturing an earth mold with a conducting wire according to claim (8), wherein the fixed length cutting machine F has the following configuration. A guide jig having a guide hole through which the earth mold M from the above-mentioned take-up machine E is fed is attached to the frame 11,
Frame 1 at the rear stage in the earth mold penetration direction of this jig
1 is provided with a cutting machine for cutting the traveling earth mold M, and the earth mold penetration direction downstream frame 11 of this cutting machine has a U-shaped box rail in the penetration direction with a downward or sideways opening. 22, the back surface of the box rail 22 is located on the axis of the earth mold penetration direction, and the opening of the box rail 22 is provided with retention means for the earth mold, and the cutting machine has the guide This fixed length cutting machine is provided with a means for moving the cutter 17 in the opening direction of the box rail 22 when the earth mold passes through the through hole of the jig to a required length.