JPH0724165B2 - Manufacturing equipment for earth molding with conductors - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for manufacturing an earth molding with a conductor for grounding an electric wire drawn from various electric devices on a utility pole.

[Conventional technology and its problems]

As shown in FIG. 9 and FIG. 10, the grounding-pulling wire P is pulled down from various electric devices of the electric pole H, and the electric wire P is pulled down.
The pipe-shaped or concave cross-section hard vinyl chloride (PVC)
Made of earth molding M is covered. In this work, in the case of a pipe shape, the electric wire P is drawn through the earth molding M and attached to the electric pole H. In the case of a concave cross section, the electric wire P is changed to the electric pole H.
And cover it with an earth molding M (Fig. 10),
In both cases, the earth molding M is fastened with a steel band or the like, the work is complicated, and improvement is desired.

Therefore, it is an object of the present invention to provide a device for simplifying the above-mentioned complicated work and for manufacturing an earth molding that can clean a pillar for an electric wire, for example.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, the crosshead of the extrusion molding machine, the inner surface transverse shape is equipped with an extrusion molding die forming a land having a crescent shape or a flat trapezoid shape, the inside of the die , The nipple through which the insulating core wire passes through the center is arranged so that the required resin flow path is formed between the peripheral dies, and the nipple has the bottom of the crescent or flat trapezoid on the inner surface of the die land. A pair of resin flow suppressing blades that are in contact with the surface and have a required clearance from the other surface and the insulating core wire are provided symmetrically with respect to the insulating core wire.

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

The lengths of the resin flow suppressing blade and the ridge are appropriately selected within a range capable of manufacturing an earth molding having a required cross-sectional shape.

On the downstream side of the extrusion die, a sizing die can be arranged closely, and the sizing die is
A land having the same cross-sectional shape as the same axis as the land of the extrusion die may be formed, and a cooling pipe may be additionally provided.

Further, on the downstream side of the sizing die, a wire drawing machine from the sizing die, a fixed length cutting machine into which electric wires from the drawing machine are continuously fed can be sequentially provided, and the fixed length cutting machine is It may have the following configuration.

A cutter for attaching a guide jig having a guide hole through which the earth molding is sent from the take-up machine to the frame, and cutting the running earth molding on the frame on the subsequent stage of the jig in the earth molding penetrating direction. The cutting machine is provided with a box-shaped rail in the penetrating direction having a downward opening or a horizontal opening in the cross section in the downstream frame of the earth-mall penetrating direction. It is located on the axis of the direction, and the retaining means of the earth molding is provided at the opening of the box rail, and the cutter is provided with the cutter when the earth molding penetrates the through hole of the guide jig for a required length. A fixed length cutting machine provided with means for moving in the opening direction of the box rail.

[Action]

With the manufacturing apparatus according to the present invention configured as described above, the insulating core wire is fed onto the central axis of the nipple, and when the resin is fed into the resin flow path, on the insulating core wire, the inner surface transverse shape of the land, that is, A crescent or flat trapezoidal cross-section jacket is coated, and a resin flow suppressing vane is used to manufacture an earth molding with a conductor in which both sides of the insulating core wire inside the jacket are concavely cut off. At this time, if there is a resin flow suppressing ridge, a slit reaching the insulating core wire is formed in the outer cover.

In the case where the sizing die is provided, the earth molding extruded by the die is shaped and cooled and hardened.

In addition, if a take-up machine and a standard length cutting machine are provided, the earth molding from the sizing die is fed into the guide jig of the standard length cutting machine via the take-up machine and travels inside the box rail through the cutting machine. . When the amount of progress reaches the required length, the cutter moves to cut the earth molding. At this time, since the earth molding is pushed in the opening direction of the rail, the cutting machine side of the ground molding in the rail moves to the opening side, and a space is created on the feed shaft of the ground molding. For this reason, the earth mall next sent enters into the space and advances while pushing the earth mall in front. By repeating this action, the earth molding which reaches the opening of the box rail is discharged downward or laterally from the opening.

〔Example〕

First, an earth molding with a conductor manufactured by the manufacturing apparatus of the present invention will be described.

An example is shown in FIG. 1, in which an insulating core wire 1 is provided along the center overall length of the inner surface of an earth molding having an arcuate cross section, the insulating core wire 1 is covered with a synthetic resin, and the coating (sheath) 2 is covered with the entire length. The slit 3 is formed across the slit 3. When the jacket 2 is a soft mixture, the slit 3 can be easily cut and peeled off, so that it is not necessary to intentionally provide the slit 3.

This product is, for example, cut into a length of about 3.3 m in advance at the factory, and at the site, connect the insulated core wire 1 to a ground wire pulled down from the distribution line system at a position higher than the reach of a passerby. However, the connection is insulated. After that, the earth molding M is pulled down while the bottom side of the cross section is being applied to the surface of the electric pole, and is clamped and fixed at appropriate intervals by a reel band, and the lower end of the insulating core wire 1 is connected to the ground rod. It should be noted that since ribs are provided on both edges 2a of the jacket 2 to make it thicker, the strength is increased and the distribution of extrusion pressure during extrusion molding, which will be described later, is made uniform to prevent deformation due to expansion and contraction of the resin. It can hold down and prevent curling. Various known shapes such as the shape shown in FIG. 2 and the trapezoidal shape shown in FIG.

Next, the manufacturing apparatus for each of the earth moldings M according to the present invention will be described.

In this embodiment, as shown in FIG. 3, an insulated core wire 1 is fed from a supply A to an extrusion molding machine B to cover an outer cover 2 to form an earth molding M with a conductor, and the earth molding M is provided.
Is run with a sizing die C, a cooling tank D, a take-up machine E, and a constant-length cutting machine F to manufacture an earth molding M with a constant-length conductor, the process of which 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 in which the inner surface has a crescent shape or a flat trapezoidal shape, that is, the external cross section of FIG. An extrusion molding die 5 having a land 4 having a shape (see a chain line in FIG. 5) is mounted. The dies 5 are aligned by adjusting the screwing amounts of the bolts f at equidistant positions on the periphery.

Inside the die 5 and the die holder DH, a nipple 6 through which the insulating core wire 1 passes is arranged so that a required resin flow path 7 is formed between the peripheral die 5 and the die holder DH. The nipple 6 is screwed and fixed to the nipple holder NH, and the bolt f of the nipple holder NH is fixed.
The tip position of the nipple 6 is adjusted by adjusting the screwing amount of. Therefore, the size of the resin flow path 7 can be adjusted 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 in consideration of the type of resin, the thickness of the jacket 2, and the like. And set it appropriately.

A pair of resin flow suppressing blades 8 shown in FIG. 5 are provided on the front surface of the nipple 6, and these suppressing blades 8 are the crescent bottom surface of the inner surface of the die land 4 when the nipple 6 is mounted on the nipple holder NH. (See the chain line in FIG. 5, bottom surface: reference numeral 4a) and has a gap t that is substantially the same as the other surface and the insulating core wire 1,
The tip thereof projects downstream from the front end of the land 4. Also,
A ridge 8a is provided so as to project from the nipple 6 between both resin flow suppressing blades 8. The ridge 8a is in contact with the die land 4 and also with the insulating core wire 1.

The protrusion amount b of the resin flow suppressing blade 8 and the protrusion 8a is appropriately set by an experiment or the like in consideration of the temperature of the resin a, the extrusion pressure and the like. The setting is such that the resin flow suppressing blade 8 and the protrusion 8a can be moved in the axial direction with respect to the nipple 6 by fitting or the like to move only that in the axial direction, or the nipple integrated with the blade 8 and the protrusion 8a. 6 is moved in the axial direction.

A sizing die C is arranged close to the downstream side of the extrusion molding die 5. In this die C, a land 9 having the same cross-sectional shape and the same axis as the land 4 of the die 5 is formed, and a cooling pipe 10 is attached. Water of an appropriate temperature circulates through the cooling pipe 10, and this hot water cools the die C. Also, on land 9,
A tetrafluoroethylene polymer (for example, DuPont, USA: trade name Teflon) 9a is coated, and this coating layer forms an earth molding M after extrusion molding.
Moves smoothly.

This extruder B has the above-mentioned configuration, and now the take-up machine E
As shown in FIG. 4 and FIG. 5, the insulating core wire 1 is fed onto the central axis of the nipple 6, and
When the resin a having the composition shown in Table 1 below is supplied to the flow path 7,
As with a general extruder, the land 4 is placed on the insulating core wire 1.
1. The ground molding M, which is covered with the outer cover 2 having a shape crossing the inner surface of the outer cover 2 and has both sides of the insulating core wire of the outer cover 2 lacked by the resin flow suppressing blade 8 and the ridges 8a, that is, the conductor shown in FIG. The grounded earth molding M is extruded.

Since the width of the slit 3 is determined by the width of the ridge 8a, the width of the slit 3 is determined in consideration of the extent to which the insulated wire 1 can be pulled out in the case of the above hard mix. Also, the ridge
If 8a is integrated with both resin flow suppressing blades 8 (chain line in FIG. 2),
The ground molding M has a sectional shape shown in FIG.

The earth molding M molded by the extrusion molding machine B and the sizing die C as described above is drawn by the drawing machine E through the cooling tank D. That is, this take-up machine E
Has a well-known structure, and as described above, the pulling action causes the insulating core wire 1 to be fed from the supply A onto the central axis of the nipple 6 of the extruder B to perform the above-mentioned extrusion molding.

The earth molding M taken by the take-up machine E is sent to the downstream fixed-length cutting machine F. As shown in FIG. 6, this constant-length cutting machine F is provided with a rectangular box pillar 12 having an opening / exit of an earth molding M at one end of a machine base (apparatus frame) 11. The rectangular box pillar 12 is opened. A cutting box 13 is provided on a base 12b on the inner surface of the portion 12a so as to be slidable back and forth with respect to the path of the earth molding M (in the arrow direction).

On the upstream side of the path of the earth molding M of the cutting box 13, a blade receiver 15 serving as a guide jig for receiving the earth molding M is fitted by a clearance adjusting nut 18 so as to be adjustable in forward and backward movements. 18a is a washer and 18b is a lock nut. After adjusting the clearance between the blade 17 and the blade receiver 15 described later, the blade receiver 15 is fixed by the lock nut 18b.

A square hole 13a for slidably receiving the blade support rod 14 is formed in the direction perpendicular to the center of the cutting box 13. The blade support rod 14 has a shape shown in FIG. 8 and is inserted from the lower part of the square hole 13a so that the overhanging part 14a of the lower part hits the lower surface of the cutting box 13 and cannot pass through.

After inserting the blade support rod 14 into the cutting box 13, the pin 19a is inserted into the pin hole 14b of the blade support rod 14, and the torsion spring 19 is interposed between both projecting ends of the pin 19a and the upper surface of the cutting box 13. Then, the blade support rod 14 is pulled up. A dovetail groove 14c is engraved on the surface of the blade support rod 14 with respect to the blade receiver 15, and a blade (cutter) 17 having an outer shape of an dovetail is fitted therein. 16 is an anvil.

On the downstream side of the cutting box 13, an earth molding guide box rail 22 having a U-shaped cross section (hereinafter referred to as a box rail) is continuously provided.
Attach the earth molding M to the box rail 22 at appropriate intervals in the length direction.
A spring 27 for staying inside is installed so as to narrow the opening of the box rail 22. As shown in FIG. 7 (a), on one end side of the inner surface of the box rail 22 (on the side of the blade receiver 15 on the right side in FIG. 6), the thickness r of the earth molding M (the first
Ribs 26 are provided apart from each other, and the ribs 26 prevent the blade 17 (cutter) described below from returning upward when the earth molding M descends. Further, a cutting strip 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. The setting piece 25 is screwed at a required position, and the earth molding M is attached to the box rail 22. When the tip is hit against the setting piece 25 by being sent to the box rail 22, the box rail 22 and the cutting box 13 move as the earth molding M advances. Reference numeral 23 in the figure denotes a support roller for the box rail 22.

A cross stroke mechanism (21) is provided on the upper portion of the rectangular box column (12), and the hammer (20) always reciprocates up and down by this mechanism (21). In the cross stroke mechanism 21, an eccentric shaft 21c fixed to an axial center shaft 21a of a normally rotating flywheel W is fitted in a hole of a slider 21b in a block 20a of the hammer 20, and the eccentric shaft 21c rotates. As a result, the slider 21b moves laterally and vertically as shown by the chain line in FIG. 6 to push down the block 20a, that is, the hammer 20. Therefore, below the hammer 20, the anvil 16
When the upper surfaces face each other (indicated by a chain line in FIG. 6), the upper surfaces are hit by the hammer 20 to lower the anvil 16, that is, the blade support rod 14, and the earth molding M is cut.

This fixed-length cutting machine F has the above-described configuration, and at the start of work, first, as shown in FIGS. 7 (a) and 7 (b), the ground molding M previously cut is filled and retained in the box rail 22. The earth molding M is prevented from being bent when the tip of the earth molding M to be fed next hits the cutting strip length setting piece 25.

From this state, when the earth molding machine M is sent from the take-up machine E to the blade receiver 15, the earth molding machine M is connected to the box rail.
Entering 22 and hitting the cut strip length setting piece 25, the setting piece 25
The box rail 22 and the cutting box 13 are moved to the left in FIG. 6 against the spring 24 via. This movement is performed without bending the earth molding M because the outer cover 2 is made of hard resin.
If the amount of movement is a fixed amount, that is, if the feed length from the blade 17 is 3.3 m, as shown by the dashed line in the figure,
16 is positioned below the hammer 20 and is hit, the blade support rod 14 descends, and the ground molding M is cut to a fixed length by the blade 17 and the blade receiver 15.

At the time of this cutting, the blade 17 pushes the earth molding M downward,
As shown in FIG. 7 (a), the cutting box 13 side of the earth molding M in the box rail 22 is lowered and the state is maintained by the ribs 26, and a space S is created at the feeding level of the earth molding M. Therefore, after cutting, the box rail 22
And the cutting box 13 is returned, but the earth mall M sent next enters the space S along with it (the seventh
In the state of the chain line (a)), the earth motor M in front is pushed down while proceeding. When this action is repeated, the earth molding M facing the opening on the lower surface of the box rail 22 pushes open the claw 27a of the spring 27 from the opening and is sequentially discharged into the machine base 11 (chain line in FIG. 7).

In this constant length cutting machine F, a reciprocating driving machine such as an air cylinder or an electromagnetic plunger can be adopted instead of the cross stroke mechanism 21.

Further, when the earth molding M is extruded with its long side vertical (upper and lower), the standard length cutting machine F is placed horizontally, the cross stroke mechanism 21 is placed horizontally, and the opening of the box rail 22 is oriented horizontally. .

〔The invention's effect〕

Since the manufacturing apparatus according to the present invention is configured as described above,
A crescent-shaped or flat trapezoidal cross-section, an insulating core wire passes through the center of the grounding conductor, and the insulating molding wire conductor lacking concave portions on both sides of the insulating core wire is smoothly and without deformation.
There is an effect that can be manufactured.

Furthermore, if a take-off machine and a fixed length cutting machine are provided, the earth molding can be obtained with a fixed length, and at this time, if the fixed length cutting machine has a box rail, etc., Since the ground mall that has been cut is supported and paid out appropriately, it is not necessary for a person to always attach it, and the cost can be reduced.

[Brief description of drawings]

1 and 2 are cross-sectional views of respective examples of the grounding molding with a conductor according to the present invention, FIG. 3 is a schematic view of an embodiment of a manufacturing apparatus according to the present invention, and FIG. 4 is a view of FIG. Fig. 5 is a horizontal sectional view of an essential part of the extrusion molding machine, Fig. 5 is a perspective view of the nipple of Fig. 3, Fig. 6 is a front view of essential parts of the standard length cutting machine of Fig. 3, and Fig. 7 is a sixth view.
It is the cutting right view of a figure, the figure (a) is an AA cross section, the same figure (b) is a BB cross section, FIG. 8 is a perspective view of the blade support rod and blade of FIG. 6, 9th. FIG. 10 is an attached explanatory view of an electric wire for pulling down the ground in a telephone pole, and FIG. 10 is a sectional view taken along line XX of FIG. M: Earth Mall, H: Utility pole, A ... Supply, B
…… Extrusion molding machine, C …… Sizing die, D …… Cooling tank, E …… Take-off machine, F …… Sizing cutter, G …… Control panel,
CH ... Crosshead, DH ... Die holder, NH ... Nipple holder, 1 ... Insulated core wire, 2 ... Coating, 3 ...
Slits, 4 ... Dice land, 5 ... Dice, 6 ...
Nipple, 7 ... Resin flow path, 8 ... Resin flow suppressing blade, 8a ...
… Resin flow suppressing ridges, 9 …… Sizing die land, 9a
…… Coating, 10 …… Cooling tube, 11 …… Frame, 12
…… Square box post, 13 …… Cutting box, 14 …… Blade support rod, 15 ……
Blade receiver, 16 ... Anvil, 17 ... Cutter (blade), 18 ...
… Adjustment nut, 19 …… Torsion spring, 20 …… Hammer, 21 …… Cross stroke mechanism, 22 …… Box rail,
24 …… Spring, 25 …… Cut length setting piece, 26 …… Rib, 27 …… Spring, 27a …… Claw.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Actual public 35-31757 (JP, Y1) Actual public 43-17015 (JP, Y1) Actual public 63-11860 (JP, Y2)

Claims (7)

[Claims] 1. An extrusion molding die 5 in which a land 4 having a crescent shape or a flat trapezoidal inner surface is formed on a crosshead CH of an extrusion molding machine B.
A nipple 6 through which the insulating core wire 1 passes is arranged so that a necessary resin flow path 7 is formed between the peripheral dies 5, and the nipple 6 has the crescent or biased inner surface of the die land 4. A pair of resin flow suppressing blades 8 that are in contact with the bottom surface 4a of the flat trapezoid and have a required clearance t from the other surface and the insulating core wire 1
Is provided symmetrically with respect to the insulating core wire 1. 2. The nipple 6 is provided with a resin flow suppressing ridge 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 insulating core wire 1. An apparatus for manufacturing an earth molding with a conductor according to claim 1, wherein: 3. The apparatus for manufacturing an earth molding with a conductor according to claim 1, wherein the resin flow suppressing blade 8 is projected downstream from the front end of the die land 4. 4. A manufacturing apparatus for an earth molding with a conductor according to any one of claims 1 to 3, wherein a sizing die C is arranged close to a downstream side of the extrusion molding die 5. The sizing die C has a land 9 having the same cross-sectional shape and the same axis as the land 4 of the die 5, and a cooling pipe 10 attached thereto. apparatus. 5. The apparatus for manufacturing an earth molding with a conductor according to claim 4, wherein the resin flow suppressing blade 8 extends into the land 9 of the sizing die C. . 6. A sizing die C in an apparatus for manufacturing an earth molding with a conductor according to claim 4 or 5.
An apparatus for manufacturing an earth molding with a conductor, which comprises, in order, a wire pulling machine E from the sizing die C and a fixed length cutting machine F into which a wire P from the pulling machine E is continuously fed on the downstream side of the. 7. The apparatus for manufacturing an earth molding with a conductor according to claim 6, wherein the constant length cutting machine F has the following configuration. A guide jig having a guide hole through which the earth molding M from the take-up machine E is fed and penetrates is attached to the frame 11, and the earth molding M running on the frame 11 at the subsequent stage in the earth molding penetrating direction of the jig. A cutting machine for cutting the machine is provided, and in the downstream frame 11 in the earth molding penetrating direction of the cutting machine, a box-shaped rail 22 having a U-shaped cross section with a downward opening or a lateral opening is provided. The back surface is located on the axis of the earth molding penetrating direction, and the staying means of the earth molding is provided at the opening of the box rail 22, and the cutting machine is provided with the through hole of the guide jig. A fixed length cutting machine comprising means for moving the cutter 17 in the opening direction of the box rail 22 when the cutter 17 penetrates the required length.