JP2001118445A - Method for fabricating coil used for installing cable and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for fabricating a coil used for installing a cable at low cost but with high quality that stably maintains the cable after installing. SOLUTION: A core wire supplier 10 supplies a metal wire 1a passing through a die 22 of an extruder 20 to coat it with a molten synthetic resin 1b to produce a resin coated metal wire 1A, which is drawn through a cooling device 30 to a transfer path S by a take and transfer device 40, thus continuously transferred to a coil shaper 50 to produce a spiral coil 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a cable erection coil used for erection of various cables, and more particularly, to a method for maintaining a cable in a stable state during and after erection work. The present invention relates to a method and an apparatus for manufacturing a cable erection coil capable of manufacturing a cable erection coil with high quality and at a low cost.

[0002]

2. Description of the Related Art Generally, when laying various cables such as a communication cable and a television cable, a messenger wire is stretched as a tensile material between telephone poles, and a metal hanger such as a cable hanger is attached to the messenger wire. 50 ~
The cables are suspended in parallel while being attached one by one at intervals of 60 cm.

[0003] However, the cable erection work involves a worker having a large number of metal hangings, and moving and attaching these hangings at intervals of 50 to 60 cm along the length of the messenger wire. In addition, since the work of attaching the hanging tool is performed at a high place, it requires a great deal of time and labor, and requires considerable skill.

In recent years, as a technique for simplifying cable erection work, it has been proposed to use a stretchable and stretchable chain coil formed of a material mainly composed of a synthetic resin in a continuous spiral shape. When a cable is erected using a chain coil, the chain coil is covered with a messenger wire, and the chain coil is extended along the messenger wire, and at the same time, the cable is extended inside the coil.
Since the cable can be fixed as it is, the workability of laying the cable can be significantly improved.

[0005] However, as described above, the telescopic chain coil has an advantage that the erection work is simple, but on the other hand, the fastener for the messenger wire is detached, or a part is cut due to a fire or accident. In this case, there is a disadvantage that the coil contracts and the cable hangs. Also, when the cable is installed while extending the chain coil, if the fixed rear end comes off or the extended front end is suddenly released, the chain coil contracts to the original length due to elastic expansion and contraction force Therefore, the cable erection work must be restarted from the beginning, and the workability is poor.

Therefore, instead of the above chain coil,
A metal wire is buried in a synthetic resin, and is permanently deformed when it is stretched to a certain extent based on an appropriate balance between plastic deformation of the metal wire and elastic deformation of the synthetic resin. Has been proposed to hold the cable in a stable state.

As a method of manufacturing such a cable erection coil, if a general composite material forming technique is applied, a synthetic resin is extruded on an outer peripheral surface of a metal wire by an extruder to form a resin-coated wire. It is conceivable that the resin-coated wire is once cooled and wound around a large drum, and then, if necessary, the resin-coated wire is unwound from the large drum to form a coil.

However, in order to unwind the resin-coated wire from the large drum and form it into a coil, it is necessary to heat-treat the resin-coated wire again, and this heat treatment degrades the physical properties of the metal wire and the synthetic resin, and furthermore, There is a problem that the manufacturing cost of the installation coil is greatly increased.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cable erection coil for holding a cable in a stable state at the time of erection work and after the erection work, which makes it possible to manufacture a cable of high quality at low cost. An object of the present invention is to provide a method and an apparatus for manufacturing a coil.

[0010]

According to the present invention, there is provided a method of manufacturing a cable erection coil for achieving the above object, wherein a metal wire runs on an outer peripheral surface thereof while passing through a die of an extruder. The method is characterized in that a synthetic resin in a molten state is supplied and formed into a resin-coated wire, and the resin-coated wire is continuously supplied to a coil forming machine without being once wound and formed into a spiral coil. .

As described above, the resin-coated wire is continuously guided from the extruder to the coil forming machine, and is formed into a spiral coil by the coil forming machine. It is possible to continuously manufacture a cable erection coil while avoiding deterioration of physical properties.

Therefore, according to the above manufacturing method, permanent deformation occurs when the metal wire is stretched to a certain extent based on an appropriate balance between the plastic deformation of the metal wire and the elastic deformation of the synthetic resin. A high-quality and low-cost cable erection coil configured to hold a cable in a stable state can be manufactured.

On the other hand, the apparatus for manufacturing a cable erection coil according to the present invention supplies a metal wire from a core wire supply unit and coats an outer peripheral surface of the metal wire with a synthetic resin in a molten state in a die of an extruder. To form a resin-coated wire, and the resin-coated wire is continuously guided from the extruder to a coil forming machine through a feed path equipped with a cooling device and a take-off and sending device. It is characterized in that the coil is formed into a spiral coil.

According to such a manufacturing apparatus, a cable erection coil can be manufactured at high quality and at low cost based on the above-described manufacturing method.

In the present invention, when forming the resin-coated wire, the outer shape of the coated resin in the cross section of the resin-coated wire is made non-circular, and the non-circle gives a twist that rotates helically along the longitudinal direction. Is preferred. To obtain a resin-coated wire with a twisted shape while suppressing the distortion of the synthetic resin by making the outer shape of the coated resin non-circular at the time of molding the resin-coated wire and giving the twist that the non-circle rotates helically. Therefore, wind noise at the time of installation of the cable erection coil can be reduced. In this case, the manufacturing apparatus includes a head unit in which the extruder supplies the molten synthetic resin around the metal wire, and a base for defining the outer shape of the resin-coated wire in the head unit. What is necessary is just to comprise so that it may rotate around the axis | shaft of this metal wire according to the supply speed of a wire.

The resin-coated wire is preferably fed linearly from the extruder to the coil former. By feeding the resin-coated wire in a straight line, it is possible to suppress the distortion of the synthetic resin. In this case, in a series of manufacturing apparatuses, the feed path from the extruder to the coil former may be formed in a straight line.

It is preferable that the resin-coated wire is cooled while being linear between the extruder and the coil former. By cooling the resin-coated wire while keeping it straight, distortion of the synthetic resin can be suppressed. In this case, the manufacturing apparatus includes a water tank provided with a through-hole through which the cooling device passes the resin-coated wire in a straight line, and a circulation path for returning cooling water flowing out of the through-hole to the water tank. What is necessary is just to set so that the water level of water is always higher than the resin-coated wire.

It is preferable that the resin-coated wire is taken out of the extruder using the frictional force of surface contact and then sent out to the coil former. By sending out the resin-coated wire while taking it up using the frictional force of surface contact, the resin-coated wire does not receive a large force locally, so even if the synthetic resin is in a soft state before coil molding, It is possible to suppress uneven thickness. In this case, as the manufacturing device, the take-off and delivery device may be constituted by a pair of belt conveyors sandwiching the resin-coated wire.

Preferably, the resin-coated wire is fed into a curved forming path of a coil forming machine and formed into a spiral coil based on the curved shape of the forming path. By feeding the resin-coated wire into a curved forming path to form a helical coil, it becomes possible to continuously form the cable-laying coil without stopping the feeding of the resin-coated wire. In addition, in order to smoothly perform the continuous molding of the coil, it is preferable that the coil formed in a spiral shape be pulled in a direction substantially perpendicular to the supply direction of the resin-coated wire in the coil molding machine.

In this case, the manufacturing apparatus includes a winding shaft having a rotation axis substantially perpendicular to the feed path of the coil forming machine, and a main pulley coaxially arranged with respect to the winding shaft. And a plurality of auxiliary pulleys arranged around the main pulley, a feed groove is provided on each of opposing surfaces of the main pulley and the auxiliary pulley, and a curved forming path passing through the feed groove around the main pulley. May be formed, the resin-coated wire may be formed into a spiral coil based on the curved shape of the forming path, and the coil may be sequentially moved along the winding axis.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 illustrates a coil erection coil according to the present invention. As shown in FIG. 1, the cable erection coil 1 has a structure in which a resin-coated wire 1A in which a synthetic resin 1b is coated around a metal wire 1a is formed in a spiral shape. The cross-sectional shape of the resin-coated wire 1A is preferably a non-circle including a polygon such as an octagon, and the non-circle is
By giving a twist that rotates helically along the longitudinal direction of a, the generation of wind noise when the cable is erected is reduced. The coil 1 has a length L in a no-load, non-stretched state before being used for cable erection work, but is extended to a length corresponding to one span between utility poles when the cable is erected.

FIG. 2 shows a state where a communication cable is erected using the cable erection coil. In FIG. 2, the coil 1 is covered by a messenger wire W stretched between utility poles, and extends over one span between the utility poles. A communication cable C is inserted through the loop of the coil 1. Therefore, cable C
Is suspended on the messenger wire W via the spiral loop of the coil 1.

In the erection work using the cable erection coil 1, a suspension point for suspending the cable C at a constant interval via a helical loop only by one operation of extending the coil 1 between utility poles. Are formed, and the cable C can be extended, and after the cable C is extended, the coil 1 can be used as it is as a cable fixing hanging device.

Accordingly, the work of temporarily laying the cable C by using a cable drawing jig such as a pulley becomes unnecessary, and
It is possible to simplify the work of attaching a large number of metal hangings one by one at regular intervals as in the conventional cable erection.

The above-described cable erection coil 1 is given such properties that the metal wire 1a is permanently deformed when extended from the length L when it is not extended. More specifically, the metal wire 1a is permanently deformed when the coil 1 is extended to ten times or more the length L when not extended. When the permanent deformation of the metal wire 1a is caused by elongation of less than 10 times the length L at the time of non-elongation, the coil 1 is wound along the messenger wire W at a constant spiral pitch as a suspension point of the cable.
Becomes difficult to extend.

As described above, when the coil 1 is extended, the metal wire 1a
Is permanently deformed, so that even if the fastener for the messenger wire W is detached or a part of the coil 1 is cut off due to a fire or an accident, the permanently deformed metal wire 1a
Accordingly, it is possible to prevent the cable C from sagging. Further, even if the fixed rear end of the coil 1 is detached or the extended front end is unexpectedly released during the cable erection work, the coil 1 does not contract to its original length.
Therefore, when the cable erection coil 1 is used, the cable C can be held in a stable state at the time of erection of the cable or after erection. Further, even if a fire occurs near the cable erection location and the synthetic resin 1b is burned down by the flame of the coil 1, the cable C can be held by the metal wire 1a.

In order to impart the above-mentioned properties to the cable erection coil 1 made of a composite material of the metal wire 1a and the synthetic resin 1b, the material of the metal wire 1a and the synthetic resin 1b is appropriately selected, and the metal wire for the coil 1 is selected. What is necessary is just to set the cross-sectional area ratio of 1a appropriately.

The diameter of the metal wire 1a is 1.0-5.
A 0 mm iron wire, copper wire, aluminum wire, or the like can be used. In particular, it is preferable to use an iron wire in order to give an optimal permanent deformation for cable erection. Further, a galvanized wire is preferably used to prevent corrosion. Metal wire 1
If the diameter of a is less than 1.0 mm, the ability to hold the cable is insufficient, and if it exceeds 5.0 mm, the coil itself becomes heavy, which is not preferable.

The metal wire 1 with respect to the sectional area of the coil 1
It is preferable that the ratio of the cross-sectional area of a be 25% or more.
If the cross-sectional area ratio of the metal wire 1a is less than 25%, the metal wire 1a is unlikely to be permanently deformed due to the elastic deformation of the synthetic resin 1b. The cross-sectional shape of the metal wire 1a is not particularly limited, and may be a circle as shown, an ellipse, a triangle, or the like.
The shape can be a polygon such as a quadrangle or an octagon.

On the other hand, as the synthetic resin 1b, a thermoplastic resin such as polyester, polyamide and polyolefin can be used. Among these thermoplastic resins,
Particularly, polyester is preferable. As this polyester, polyethylene terephthalate, polybutylene terephthalate, or adipic acid, isophthalic acid,
Copolymerized polyester obtained by copolymerizing a third component such as isophthalic acid sulfonate and polyethylene glycol can be used. In particular, non-crystalline polyethylene terephthalate is the most preferable material because it hardly causes whitening due to deformation.

As the polyamide, nylon 6,
Examples thereof include nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, and a copolymerized polyamide comprising a combination of these nylon components.

Of course, these thermoplastic resins may optionally contain ordinary additives such as heat-resistant agents, weathering agents, light-proofing agents, antioxidants, antistatic agents, leveling agents, dyes and pigments. Can be.

The length L of the cable erection coil 1 when it is not extended is preferably shorter from the viewpoint of handleability.
When the cable is erected, it is preferable to set the cable so that it can be extended to at least one span between the utility poles, so that the workability is improved. Therefore, when the length L at the time of non-extension is in the range of 500 to 2000 mm, the length at the time of extension is 10 to the length L.
It is preferable to set the range to 80 times, especially 20 to 60 times. The outer diameter D of the coil 1 when it is not extended is 20 to 120.
mm.

FIGS. 3 to 9 exemplify an apparatus for carrying out the method for manufacturing a cable erection coil according to the present invention.

As shown in FIG. 3, this manufacturing apparatus forms a resin-coated wire 1A by coating a core wire supply unit 10 for supplying a metal wire 1a and a synthetic resin in a molten state on the outer peripheral surface of the metal wire 1a. The extruder 20, the cooling device 30 and the take-off and delivery device 40 that are sequentially arranged in the feed path S of the molded resin-coated wire 1 </ b> A, and the resin-coated wire 1 </ b> A are formed into the spiral coil 1. A coil forming machine 50 is provided continuously. The feed path S from the extruder 20 to the coil former 50 is formed in a straight line, and the resin-coated wire 1A formed by the extruder 20 is not once wound around a reel or the like, and is not wound on a reel or the like. 50 is continuously supplied.

The core wire supply unit 10 is configured to rotatably support a reel 11 that holds the metal wire 1a in a wound state. The core wire supply unit 10 sends the metal wire 1 to the extruder 20 in accordance with the driving force of the take-off and delivery device 40.
a is supplied continuously. Downstream of the reel 11, a straightening machine 12 for correcting the habit of the metal wire 1a unwound from the reel 11 is provided. This straightening machine 12
As shown in FIG. 4, a plurality of straightening rollers 12a alternately arranged on the left and right sides of the metal wire 1a, and alternately on the upper and lower sides of the metal wire 1a so that the rotation axis is substantially orthogonal to the straightening rollers 12a. Correction rollers 12b arranged at
To correct the habit of the metal wire 1a that comes into contact with the correction rollers 12a and 12b. On the downstream side of the straightening machine 12, a feed roller 13 for sandwiching the metal wire 1a from both left and right sides is provided, and an appropriate tension is maintained between the feed roller 13 and the take-off and sending device 40. It is supposed to be.

As shown in FIG. 5, the extruding section of the extruder 20 has a head section 2 for supplying a synthetic resin 1b in a molten state.
1 is provided, and the head portion 21 is provided with a sleeve-shaped base 22 penetrating the inside in the front-rear direction. The base 22 is rotatably inserted into the head 21, and the movement in the rotation axis direction is restricted by the cap 23 attached to the head 21.

A discharge port 22a is provided at the front end of the base 22, and its cross section matches the cross-sectional shape of the resin-coated wire 1A. A cylindrical sleeve holding hole 25 is provided behind the discharge port 22a through a communication hole 22b formed radially, and a sleeve 24 for guiding the metal wire 1a is detachably inserted into the sleeve holding hole 25. ing. Sleeve 24
A throttle hole 24a having the same diameter as the metal wire 1a is provided at the end of the sleeve 24. The molten resin press-fitted into the communication hole 22b is filled with the sleeve 24.
So that it does not flow back to the side. A communication hole 21a formed in the head portion 21 communicates with a communication hole 22b of the base 22,
The molten resin supplied from the extruder 20 is coated around the metal wire 1a.

The base 22 is configured to rotate around the axis of the metal wire 1a in accordance with the supply speed of the metal wire 1a by driving means (not shown). Therefore, when coating the outer peripheral surface of the metal wire 1a with the synthetic resin 1b in a molten state, the base 22 is rotated in accordance with the supply speed of the metal wire 1a to impart a twist to the metal wire 1a. Instead, only the outer shape of the synthetic resin 1b to be coated can be twisted. The sleeve 24, which is long in the axial direction, has a function of preheating the metal wire 1a, and the preheating strengthens the bond between the metal wire 1a and the synthetic resin 1b, thereby increasing the cutting strength.

As shown in FIG. 6, the cooling device 30 has a pair of through holes 31 through which the resin-coated wire 1A passes straight.
a, a first cooling process comprising a water tank 31 provided with a and 31a, and a circulation path 32 for returning cooling water flowing out of the through-hole 31a to the water tank 31; The second cooling process includes a water tank 33 provided with the through-holes 33a, 33a, and a circulation path 34 for returning the cooling water flowing out of the through-hole 33a to the water tank 33. The water level of the cooling water in the water tanks 31 and 33 is set to be always higher than that of the resin-coated wire 1A. That is, the reflux amount of the cooling water to each water tank is set to be equal to or more than the outflow amount of the cooling water from each water tank. The temperature of the cooling water in the first cooling process is set higher than the temperature of the cooling water in the second cooling process.

As shown in FIG. 7, the take-off and delivery device 40 is composed of a pair of annular belt conveyors 41, 41 which sandwich the resin-coated wire 1A from above and below. The belt conveyors 41, 41 each have a pair of drive rollers 42,
42, these drive rollers 42, 4
By the rotation drive of No. 2, it moves along the feed path S while making surface contact with the resin-coated wire 1A.

As shown in FIGS. 8 and 9, the coil forming machine 50 has a winding shaft 51 having a rotation axis substantially perpendicular to the feeding path S, and a coaxial shaft with the winding shaft 51. The main pulley 52 is provided with a plurality of auxiliary pulleys 53 disposed around the main pulley 52. The take-up shaft 51 and the main pulley 52 are each a pair of left and right bearings 5.
4, 54 and a pair of left and right bearings 55, 55, which are rotatably mounted around a long pipe member 56,
The pipe member 56 is fixed to the support plate 59 by fastening the support rod 57 and the bolt 58. A cap 60 for restricting the movement of the bearing 54 and a spacer 61 for restricting the movement of the bearing 55 are inserted into the end of the pipe member 56.

The plurality of auxiliary pulleys 53 are rotatably mounted around a short pipe member 63 via a pair of left and right bearings 62, 62, and this pipe member 63 is screwed into a bolt hole of the support plate 59. It is fixed to the support plate 59 by the bolt 64 that has been made. The auxiliary pulley 53 and the main pulley 52 are set such that their outer peripheral surfaces are close to each other. A spacer 65 for restricting the movement of the bearing 62 is inserted into an end of the pipe member 63.

Feed grooves 52a and 53a are provided on the opposing surfaces of the main pulley 52 and the sub pulley 53, respectively. A curved forming path passing through the feed grooves 52a and 53a is formed around the main pulley 52. Therefore, the resin-coated wire 1A continuously sent out from the take-off and sending-out device 40 advances along the molding path, and the spiral coil 1A is formed based on the curved shape.
, And sequentially moves along the winding shaft 51 as it is. Also, as shown in FIG. 8, the feed grooves 52a, 53a
Are provided next to each other to increase the number of turns of the resin-coated wire 1A, it is possible to apply an urging force to the coil 1 to make the coil pitch interval smaller. By providing the coil 1 with an urging force for reducing the pitch interval, there is an advantage that the metal wire 1a is easily deformed permanently when the coil is extended, and the coil 1 is easily handled.

The outer diameter of the winding shaft 51 is set larger than the outer diameter of the main pulley 52. Therefore, the inner diameter of the coil 1 is determined by the outer diameter of the winding shaft 51. Winding shaft 5
A product holding shaft 66 for holding the coil 1 as a product to a predetermined length is connected to one end. The coil 1 sent to the product holding shaft 66 may be cut into a desired length by using any cutting means. In addition, since the length of the coil 1 in the unstretched state when it is extended during the cable erection work is difficult to understand, the coil 1 is marked on the surface of the coil 1 for each desired unit length so that the length at the time of extension can be easily determined. Good.

Next, a method of manufacturing a cable erection coil using the above-described manufacturing apparatus will be described. In the case of manufacturing a cable erection coil using the manufacturing apparatus of the present embodiment, the metal wire 1a is supplied from the core wire supply unit 10 and the metal wire 1a is melted in the die 22 of the extruder 20 on the outer peripheral surface of the metal wire 1a. The resin-coated wire 1A is formed by coating the synthetic resin 1b, and the resin-coated wire 1A is continuously guided from the extruder 20 to the coil forming machine 50, and is formed into the spiral coil 1 by the coil forming machine 50.

Thus, the resin-coated wire 1A is connected to the extruder 2
0 to continuously form the spiral coil 1 by guiding the coil to the coil forming machine 50. Therefore, unnecessary heat treatment is eliminated, and the deterioration of the physical properties of the metal wire 1a and the synthetic resin 1b is avoided. Can be manufactured continuously.

The metal wire 1 is used as the cable erection coil 1.
It is difficult to give desired physical properties if an extra heat treatment is applied when manufacturing a material which is permanently deformed when extended to some extent based on an appropriate balance between the plastic deformation of a and the elastic deformation of the synthetic resin 1b. In addition, the manufacturing cost increases. However, according to the manufacturing method of the above embodiment, it is possible to set the optimal heat treatment conditions for the metal wire 1a and the synthetic resin 1b, so that the high-quality cable erection coil 1 is manufactured continuously and at low cost. be able to.

In the above embodiment, the feed path S is linearly formed from the extruder 20 to the coil forming machine 50, and the resin-coated wire 1A is linearly fed from the extruder 20 to the coil forming machine 50. are doing. By feeding the resin-coated wire 1A in a straight line as described above, unnecessary external force is not applied to the synthetic resin 1b, so that distortion of the synthetic resin 1b can be suppressed to a minimum.

In the extrusion step by the extruder 20, the outer shape of the synthetic resin 1b in the cross section of the resin-coated wire 1A is made non-circular based on the shape of the die 22, and
The base 22 is rotated around the axis of the metal wire 1a in accordance with the supply speed of the metal wire 1a, so that only the outer shape of the synthetic resin 1b to be coated is twisted. Thus, the resin-coated wire 1
When the outer shape of the synthetic resin 1b to be coated at the time of molding A is made non-circular, and the non-circle is given a torsion that rotates helically,
A twisted shape for reducing wind noise can be imparted to the cable erection coil 1 while minimizing distortion of the synthetic resin 1b.

In the cooling step between the extrusion molding machine 20 and the coil molding machine 50, the cooling device 30 is used to cool the resin-coated wire 1A while keeping it straight. By cooling the resin-coated wire 1A while keeping it linear, distortion of the synthetic resin can be suppressed to a minimum.
In particular, if the cooling process is configured in two stages and the cooling temperature is reduced stepwise from the first cooling process to the second cooling process, the effect of suppressing distortion of the synthetic resin 1b is further enhanced.

In the pulling and feeding process between the extruder 20 and the coil forming machine 50, the resin-coated wire 1 A is extruded by the frictional force due to the surface contact of the belt conveyor 41 using the above-mentioned picking and feeding device 40. It is taken from the molding machine 20 and sent out to the coil molding machine 50 as it is. By driving the resin-coated wire 1A while the belt conveyor 41 contacts the resin-coated wire 1A in a wide area as described above, the resin-coated wire 1A is not locally subjected to a large force. Even if the resin 1b is in a soft state, the thickness of the synthetic resin 1b will not be uneven.

In the forming step by the coil forming machine 50, the resin-coated wire 1A is fed into a curved forming path formed around the main pulley 52 of the coil forming machine 50, and a spiral coil is formed based on the curved shape. It should be molded into 1. By feeding the resin-coated wire 1A into a curved forming path and forming the resin-coated wire 1A in a spiral shape in this manner, the cable-laying coil 1 can be continuously formed without stopping the feeding of the resin-coated wire 1A. . Also, the coil forming machine 50
In this case, the spirally formed coil 1 is taken up by the winding shaft 51 and the product holding shaft 66 in a direction substantially perpendicular to the supply direction of the resin-coated wire 1A. Thereby, the continuous forming of the cable erection coil 1 can be performed smoothly.

As described above, if the initial strain in the synthetic resin 1b is substantially eliminated, even if the coil 1 is extended when the cable is erected, no excessive strain is generated in the synthetic resin 1b, and damage such as cracks is prevented. Since corrosion hardly occurs, corrosion of the metal wire 1a due to intrusion of rainwater or the like can be prevented for a long period of time. Therefore, the safety and reliability of the cable erection coil 1 that supports the cable for a long time after the erection work can be further improved.

[0056]

As described above, according to the method for manufacturing a cable erection coil of the present invention, while the metal wire is running so as to pass through the die of the extruder, the molten state is synthesized on the outer peripheral surface thereof. The resin is supplied to form a resin-coated wire, and the resin-coated wire is continuously supplied to a coil forming machine without being wound once to form a spiral coil, so that the plastic deformation of the metal wire and the elasticity of the synthetic resin Manufactures high-quality and low-cost cable erection coils that are permanently deformed when stretched to a certain degree based on an appropriate balance with deformation, thereby maintaining the cable in a stable state during and after erection. can do.

Further, in the apparatus for manufacturing a cable erection coil according to the present invention, a metal wire is supplied from a core wire supply unit, and an outer peripheral surface of the metal wire is coated with a synthetic resin in a molten state in a die of an extruder. To form a resin-coated wire, and continuously guide the resin-coated wire to a coil forming machine through a feed path equipped with a cooling device and a take-off and delivery device, and form a spiral coil with the coil forming machine. Since it is configured to be molded, it is possible to manufacture the cable erection coil with high quality and at low cost based on the above manufacturing method.

[Brief description of the drawings]

FIG. 1 shows an example of a cable erection coil according to the present invention, wherein (a) is a side view of the coil, (b) is a cross-sectional view of a resin-coated wire constituting the coil, and (c) is a view of the resin-coated wire. It is a side view.

FIG. 2 is a side view showing a state where a cable is erected using the cable erection coil of FIG. 1;

FIG. 3 is a top view showing the apparatus for manufacturing a cable erection coil according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a straightening machine included in the manufacturing apparatus of FIG.

FIG. 5 is an enlarged sectional view showing a head portion of an extruder forming the manufacturing apparatus of FIG. 3;

FIG. 6 is a sectional view showing a cooling device constituting the manufacturing apparatus of FIG. 3;

FIG. 7 is a side view showing a take-off and sending-out device constituting the manufacturing apparatus of FIG. 3;

FIG. 8 is a sectional view showing a coil forming machine constituting the manufacturing apparatus of FIG.

FIG. 9 is a view as viewed in the direction of arrows XX in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil 1a Metal wire 1b Synthetic resin 1X Resin-coated wire 10 Core wire supply part 20 Extruder 21 Head part 22 Cap 30 Cooling device 31, 33 Water tank 32, 34 Circulation path 31a, 33a Through-hole 40 Pick-up and delivery device 41 Belt conveyor 50 Coil forming machine 51 Winding shaft 52 Main pulley 53 Secondary pulley 52a, 53a Feed groove S Feed path

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29K 101: 00 B29K 101: 00 105: 08 105: 08 B29L 31:34 B29L 31:34 (72) Inventor Shinji Suzuki 1-15-8 Hashimotodai, Sagamihara-shi, Kanagawa Prefecture, Nobuyuki Sangyo Co., Ltd. (72) Inventor Fumiyoshi Arima 1-15-8 Hashimotodai, Sagamihara-shi, Kanagawa Pref. Inventor Katsunori Mizaku 2341-5 Fukaya, Ayase-shi, Kanagawa F-term (reference) 4F207 AA03 AA24 AA29 AD03 AD15 AG03 AG09 AG14 AH35 KA01 KA17 KB18 KK54 KL58 KL80 KW41 5G325 JA09 JB17 JC09

Claims (13)

[Claims] 1. While running a metal wire so as to pass through a die of an extruder, a molten synthetic resin is supplied to an outer peripheral surface thereof to form a resin-coated wire, and the resin-coated wire is once wound. A method for manufacturing a cable erection coil in which a coil is continuously supplied to a coil forming machine and formed into a helical coil. 2. The method of forming a resin-coated wire, wherein the outer shape of the coating resin in a cross section of the resin-coated wire is made non-circular, and the non-circle gives a twist that rotates helically along the longitudinal direction. The method for manufacturing a cable erection coil according to claim 1. 3. The method according to claim 1, wherein the resin-coated wire is fed linearly from the extruder to the coil former. 4. The method according to claim 3, wherein the resin-coated wire is cooled between the extrusion molding machine and the coil molding machine while being kept straight. 5. The cable erection coil according to claim 3, wherein the resin-coated wire is drawn from the extruder using surface contact frictional force, and is subsequently sent to the coil former. Production method. 6. The coil-forming machine according to claim 1, wherein the resin-coated wire is fed into a curved forming path of the coil forming machine, and is formed into a spiral coil based on a curved shape of the forming path. 3. The method for manufacturing a cable erection coil according to claim 1. 7. The coil forming machine according to claim 1, wherein the coil formed in a spiral shape is taken in a direction substantially perpendicular to a supply direction of the resin-coated wire. Method for manufacturing coil for cable erection. 8. A resin-coated wire is supplied by supplying a metal wire from a core wire supply section and coating the outer peripheral surface of the metal wire with a synthetic resin in a molten state in a die of an extruder. Is continuously guided from the extruder to the coil forming machine through a feed path equipped with a cooling device and a take-off and delivery device,
An apparatus for manufacturing a cable erection coil configured to be formed into a spiral coil by the coil forming machine. 9. The extruder comprises a head for supplying a synthetic resin in a molten state around the metal wire, and a die for defining an outer shape of the resin-coated wire in the head. 9. The apparatus for manufacturing a cable erection coil according to claim 8, wherein the metal wire is rotated around an axis of the metal wire in accordance with a supply speed of the metal wire. 10. The feed path from the extruder to the coil former is formed in a straight line.
2. The apparatus for manufacturing a coil for cable installation according to claim 1. 11. The cooling device, comprising: a water tank provided with a through-hole through which the resin-coated wire passes straight, and a circulation path for returning cooling water flowing out of the through-hole to the water tank, The cable laying coil manufacturing apparatus according to claim 10, wherein a water level of the cooling water in the water tank is set to be always higher than the resin-coated wire. 12. The manufacturing apparatus according to claim 10, wherein the take-off and delivery device comprises a pair of belt conveyors sandwiching the resin-coated wire. 13. A winding shaft having a rotation axis substantially perpendicular to the feed path, a main pulley coaxially arranged with respect to the winding shaft, It has a plurality of auxiliary pulleys arranged around the main pulley, and has a feed groove on each of the opposing surfaces of the main pulley and the auxiliary pulley, and forms a curved forming path passing through the feed groove around the main pulley. And forming the resin-coated wire into a spiral coil based on the curved shape of the molding path, and moving the coil sequentially along the winding axis.
An apparatus for manufacturing a coil for cable installation according to any one of the preceding claims.