JP4442733B2 - Method and apparatus for manufacturing cable laying coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for manufacturing a cable laying coil used when laying various cables, and more specifically, a high quality cable laying coil that holds a cable in a stable state during and after the laying work. The present invention relates to a method and a device for manufacturing a cable laying coil that can be manufactured at low cost.
[0002]
[Prior art]
In general, when laying various cables such as communication cables and television cables, a messenger wire is stretched between the utility poles as a tensile material, and a metal hanger such as a cable hanger is placed between the messenger wires at intervals of 50 to 60 cm. The cables are suspended in parallel while being attached one by one.
[0003]
However, in the cable erection work, an operator has a number of metal hanging tools, and these hanging tools are attached while moving at intervals of 50 to 60 cm along the longitudinal direction of the messenger wire. It took a lot of time and labor to install the hanging tool at a high place, and it required considerable skill.
[0004]
In recent years, as a method for simplifying cable laying work, it has been proposed to use a stretchable chain coil formed in a continuous spiral shape from a material mainly composed of synthetic resin. When installing a cable using a chain coil, it is possible to externally attach the chain coil to the messenger wire, extend the chain coil along the messenger wire, and simultaneously extend the cable to the inside of the coil and fix it as it is. Therefore, the cable erection workability can be remarkably improved.
[0005]
However, as described above, the telescopic chain coil has the advantage that the installation work is simple, but on the other hand, when the fastener to the messenger wire is removed or part of it is cut due to a fire or an accident, etc. The coil contracts and the cable hangs down. Also, when laying the cable while extending the chain coil, if the fixed rear end part comes off or the extended front part is released unexpectedly, the chain coil contracts to its original length due to the elastic expansion and contraction force. For this reason, the cable laying work has to be performed again from the beginning, and there is a drawback that the workability is poor.
[0006]
Therefore, instead of the chain coil, a metal wire is embedded in a synthetic resin, and when the metal wire is stretched to some extent based on an appropriate balance between the plastic deformation of the metal wire and the elastic deformation of the synthetic resin, it is permanently deformed. Has proposed a cable laying coil that holds a cable in a stable state during and after laying work.
[0007]
As a method for producing such a cable laying coil, if a general composite material forming technique is applied, a synthetic resin is extruded onto an outer peripheral surface of a metal wire by an extruder to form a resin-coated wire. It is conceivable that after being cooled and wound around a large drum, the resin-coated wire is unwound from the large drum as necessary and formed into a coil shape.
[0008]
However, in order to unwind a resin-coated wire from a large drum and form it into a coil shape, it is necessary to heat-treat the resin-coated wire again. This heat treatment deteriorates the physical properties of the metal wire and the synthetic resin, and the cable laying coil. There has been a problem of significantly increasing the manufacturing cost.
[0009]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a cable laying coil manufacturing method and a manufacturing apparatus capable of manufacturing a cable laying coil that holds a cable in a stable state during and after laying work at high quality and at low cost. There is to do.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, the method for manufacturing a cable laying coil according to the present invention supplies a synthetic resin in a molten state to an outer peripheral surface of a metal wire while running so as to pass through a die of an extruder. Forming into resin-coated wire, and continuously feeding the resin-coated wire to a coil forming machine without winding it up to form a spiral coilA method for manufacturing a cable laying coil,
  As the coil forming machine, a winding shaft having a rotation axis in a direction substantially orthogonal to the feeding path of the resin-coated wire, a main pulley arranged coaxially with the winding shaft, A plurality of auxiliary pulleys arranged around the pulley, and a feed groove is provided on each of the opposing surfaces of the main pulley and the auxiliary pulley, and a curved forming path passing through the feed groove is formed around the main pulley. The coil-coated machine is used to form the resin-coated wire into a spiral coil based on the curved shape of the molding path, and the spirally formed coil is sequentially moved along the winding shaft. The resin-coated wire is pulled in a direction substantially perpendicular to the supply direction of the resin-coated wire.It is characterized by this.
[0011]
In this way, the resin-coated wire is continuously guided from the extrusion molding machine to the coil molding machine, and is formed into a spiral coil by the coil molding machine, so that excessive heat treatment is eliminated and the physical properties of the metal wire and the synthetic resin are deteriorated. Thus, the cable laying coil can be continuously manufactured.
[0012]
Therefore, according to the above manufacturing method, the cable is permanently deformed when stretched to some extent based on an appropriate balance between the plastic deformation of the metal wire and the elastic deformation of the synthetic resin, thereby stabilizing the cable during and after the installation work. The cable laying coil that is held in a state can be manufactured at high quality and at low cost.
[0013]
  On the other hand, the cable laying coil manufacturing apparatus of the present invention supplies a metal wire from a core wire supply unit and coats the outer peripheral surface of the metal wire with a synthetic resin in a molten state in a die of an extruder. A wire is formed, and the resin-coated wire is continuously led from the extrusion molding machine to a coil molding machine through a feeding path provided with a cooling device and a take-out and feeding device. Configured to mold into coilA device for manufacturing a cable laying coil,
  The coil forming machine includes a winding shaft having a rotation axis in a direction substantially orthogonal to the feeding path, a main pulley disposed coaxially with the winding shaft, and a periphery of the main pulley. A plurality of sub pulleys arranged, and a feed groove is provided on each of the opposing surfaces of the main pulley and the sub pulley, and a curved forming path passing through the feed groove is formed around the main pulley. The resin-coated wire is formed into a spiral coil based on the curved shape of the road, and the coil is sequentially moved along the winding axis.It is characterized by this.
[0014]
According to such a manufacturing apparatus, the cable laying coil can be manufactured at high quality and at low cost based on the manufacturing method described above.
[0015]
In the present invention, when molding the resin-coated wire, it is preferable that the outer shape of the coating resin in the cross section of the resin-coated wire is made non-circular and that the non-circular shape is twisted in a spiral manner along the longitudinal direction. . Obtaining a resin-coated wire having a twisted shape while suppressing distortion of the synthetic resin by making the outer shape of the coated resin non-circular and imparting a twist that rotates the non-circular spirally during molding of the resin-coated wire Thus, it is possible to reduce wind noise when the cable laying coil is installed. As a manufacturing apparatus in this case, an extrusion molding machine includes a head portion that supplies a synthetic resin in a molten state around a metal wire, and a die that defines an outer shape of the resin-coated wire in the head portion, and the die is a metal 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.
[0016]
The resin-coated wire is preferably fed linearly from the extrusion molding machine to the coil molding machine. By feeding the resin-coated wire linearly, it becomes possible to suppress the distortion of the synthetic resin. In this case, the supply path from the extrusion molding machine to the coil molding machine may be configured linearly in a series of manufacturing apparatuses.
[0017]
The resin-coated wire is preferably cooled in a straight line between the extruder and the coil molding machine. By cooling the resin-coated wire in a straight line, it is possible to suppress the distortion of the synthetic resin. As a manufacturing apparatus in this case, the cooling device includes a water tank provided with a through-hole through which the resin-coated wire passes in a straight line, and a circulation path for returning the cooling water flowing out from the through-hole to the water tank. What is necessary is just to set the water level of water so that it may always become higher than a resin-coated wire.
[0018]
It is preferable that the resin-coated wire is taken out from the extrusion molding machine by using a surface contact frictional force and subsequently sent out to the coil molding machine. By pulling out the resin-coated wire while pulling it using the frictional force of the surface contact, the resin-coated wire is not subjected to a large force locally, so even if the synthetic resin is soft before coil molding, It is possible to suppress uneven thickness. As a manufacturing apparatus in this case, the take-out and delivery apparatus may be constituted by a pair of belt conveyors that sandwich a resin-coated wire.
[0019]
  The resin-coated wire can be fed into a curved forming path of a coil forming machine and formed into a helical coil based on the curved shape of the forming path.is necessary. By feeding the resin-coated wire into a curved forming path and forming it into a spiral coil, it becomes possible to continuously form the cable laying coil without stopping the feeding of the resin-coated wire. Further, in order to smoothly perform continuous forming of the coil, in the coil forming machine, the coil formed in a spiral shape can be drawn in a direction substantially perpendicular to the supply direction of the resin-coated wire.is necessary.
[0020]
As a manufacturing apparatus in this case, the coil forming machine has a winding shaft whose rotation axis is a direction substantially orthogonal to the feeding path, a main pulley arranged coaxially with the winding shaft, A plurality of sub pulleys arranged around the main pulley, and a feed groove is provided on each of the opposing surfaces of the main pulley and the sub pulley, and a curved forming path passing through the feed groove is formed around the main pulley. 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 INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0022]
FIG. 1 illustrates a cable laying coil according to the present invention. As shown in FIG. 1, the cable laying 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 spirally formed. The cross-sectional shape of the resin-coated wire 1A is preferably a non-circular shape including a polygon such as an octagon, and the non-circular shape is twisted so as to rotate spirally along the longitudinal direction of the metal wire 1a. The generation of wind noise at the time is reduced. The coil 1 has a length L in an unloaded and unextended state before being used for cable installation work, but is extended to a length corresponding to one span between utility poles when the cable is installed.
[0023]
FIG. 2 shows a state in which a communication cable is installed using the cable laying coil. In FIG. 2, the coil 1 is sheathed by a messenger wire W stretched between utility poles, and is extended over one span between the utility poles. A communication cable C is inserted into the loop of the coil 1. Therefore, the cable C is suspended from the messenger wire W via the spiral loop of the coil 1.
[0024]
In the construction work using the cable laying coil 1, all the suspension points for suspending the cable C at regular intervals through the spiral loop are formed by a single operation of extending the coil 1 between the utility poles. Then, 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 hanger.
[0025]
Therefore, the work of temporarily laying the cable C using a cable extension jig such as a pulley is not necessary, and the work of attaching a large number of metal suspensions one by one at regular intervals as in the conventional cable laying. It can be simplified.
[0026]
The cable laying coil 1 has physical properties such that the metal wire 1a is permanently deformed when it is 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 more than 10 times the length L at the time of non-extension. If the permanent deformation of the metal wire 1a occurs with an extension of less than 10 times the non-extension length L, it is difficult to extend the coil 1 along the messenger wire W while keeping the helical pitch constant as a suspension point of the cable. become.
[0027]
As described above, since the metal wire 1a is permanently deformed when the coil 1 is extended, the coil 1 is permanently deformed even when the fastener for the messenger wire W is removed or a part of the coil 1 is cut due to a fire or an accident. The metal wire 1a can prevent the cable C from hanging down. In addition, when the cable 1 is erected, the coil 1 is not contracted to the original length even if the fixed rear end of the coil 1 comes off or the extended tip is released unexpectedly. Therefore, when the cable laying coil 1 is used, the cable C can be held in a stable state during and after the erection of the cable. Even if a fire occurs near the cable erection site and the coil 1 is struck by a flame and the synthetic resin 1b is burned off, the cable C can be held by the metal wire 1a.
[0028]
In order to give the above properties to the cable laying coil 1 made of the 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 1a is disconnected from the coil 1. What is necessary is just to set an area ratio appropriately.
[0029]
As the metal wire 1a, an iron wire, a copper wire, an aluminum wire or the like having a diameter of 1.0 to 5.0 mm can be used. In particular, it is preferable to use an iron wire in order to give an optimum permanent deformation for cable installation. Moreover, it is good to use a galvanized wire for corrosion prevention. If the diameter of the metal wire 1a is less than 1.0 mm, the ability to hold the cable is insufficient, and conversely if it exceeds 5.0 mm, the coil itself becomes heavy.
[0030]
The ratio of the cross-sectional area of the metal wire 1a to the cross-sectional area of the coil 1 is preferably 25% or more. When the cross-sectional area ratio of the metal wire 1a is less than 25%, the metal wire 1a is difficult to be permanently deformed due to elastic deformation of the synthetic resin 1b. In addition, the cross-sectional shape of the metal wire 1a is not particularly limited, and may be a polygon such as an ellipse, a triangle, a quadrangle, or an octagon in addition to a circle as illustrated.
[0031]
On the other hand, as the synthetic resin 1b, thermoplastic resins such as polyester, polyamide, and polyolefin can be used. Of these thermoplastic resins, polyester is particularly preferable. Examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, or a copolymer polyester obtained by copolymerizing a third component such as adipic acid, isophthalic acid, isophthalic acid sulfonate, and polyethylene glycol. In particular, amorphous polyethylene terephthalate is the most preferable material because it hardly causes whitening due to deformation.
[0032]
Further, examples of the polyamide include nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, and a copolymer polyamide composed of a combination of these nylon constituents.
[0033]
Of course, these thermoplastic resins can optionally contain usual additive components such as heat-resistant agents, weathering agents, light-proofing agents, antioxidants, antistatic agents, smoothing agents, dyes and pigments.
[0034]
The length L when the cable laying coil 1 is not stretched is preferably shorter from the viewpoint of handleability, but when laying the cable, it is better to set it so that it can be extended to at least one span between the utility poles. To do. 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 preferably 10 to 80 times, more preferably 20 to 60 times the length L. The outer diameter D of the coil 1 when not extended is preferably in the range of 20 to 120 mm.
[0035]
3 to 9 illustrate an apparatus for carrying out the method for manufacturing a cable laying coil according to the present invention.
[0036]
As shown in FIG. 3, this manufacturing apparatus includes a core wire supply unit 10 that supplies a metal wire 1a, and an extrusion molding machine that forms a resin-coated wire 1A by coating the outer peripheral surface of the metal wire 1a with a synthetic resin in a molten state. 20, a cooling device 30 and a take-out and delivery device 40 that are sequentially arranged in the feeding path S of the molded resin-coated wire 1A, and a coil molding machine that molds the resin-coated wire 1A into a spiral coil 1 50 continuously. The feeding path S from the extrusion molding machine 20 to the coil molding machine 50 is configured in a straight line, and the resin-coated wire 1A molded by the extrusion molding machine 20 is not wound around a reel or the like, and the subsequent coil molding machine. 50 is continuously supplied.
[0037]
The core wire supply unit 10 is configured to rotatably support a reel 11 that holds the metal wire 1a in a wound state. From the core wire supply unit 10, the metal wire 1 a is continuously supplied to the extrusion molding machine 20 according to the driving force of the take-up and delivery device 40. On the downstream side of the reel 11, a straightening machine 12 for correcting wrinkles of the metal wire 1a unwound from the reel 11 is disposed. As shown in FIG. 4, the straightening machine 12 includes a plurality of straightening rollers 12a arranged alternately on the left and right sides of the metal wire 1a, and a metal wire so that the rotation axis is substantially orthogonal to the straightening rollers 12a. A plurality of straightening rollers 12b arranged alternately on the upper and lower sides of 1a are provided, and the wrinkles of the metal wire 1a contacting the straightening rollers 12a and 12b are straightened. Further, on the downstream side of the straightening machine 12, a feeding roller 13 that sandwiches the metal wire 1 a from both the left and right sides is disposed, and an appropriate tension is maintained between the feeding roller 13 and the take-up and feeding device 40. It has come to be.
[0038]
As shown in FIG. 5, a head portion 21 for supplying a synthetic resin 1b in a molten state is attached to the extrusion portion of the extrusion molding machine 20, and a sleeve-like base 22 that penetrates the inside of the head portion 21 in the front-rear direction. Is provided. The base 22 is rotatably inserted into the head portion 21, and movement in the rotation axis direction is restricted by a cap 23 attached to the head portion 21.
[0039]
A discharge port 22 a is provided at the front end of the base 22, and the cross section thereof coincides with the cross-sectional shape of the resin-coated wire 1 </ b> A. A cylindrical sleeve holding hole 25 is provided behind the discharge port 22a via a radially communicating hole 22b. A sleeve 24 for guiding the metal wire 1a is detachably inserted into the sleeve holding hole 25. ing. A throttle hole 24a having the same diameter as the metal wire 1a is provided at the tip of the sleeve 24 so that the molten resin press-fitted into the communication hole 22b does not flow backward to the sleeve 24 side. The communication hole 21a drilled in the head portion 21 communicates with the communication hole 22b of the base 22 so as to coat the molten resin supplied from the extrusion molding machine 20 around the metal wire 1a.
[0040]
The base 22 is configured to rotate around the axis of the metal wire 1a by a driving means (not shown) according to the supply speed of the metal wire 1a. Therefore, when covering the outer peripheral surface of the metal wire 1a with the synthetic resin 1b in the molten state, the metal wire 1a is twisted by rotating the base 22 according to the supply speed of the metal wire 1a. In addition, only the outer shape of the synthetic resin 1b to be coated can be twisted. Further, the sleeve 24 which is long in the axial direction has a function of preheating the metal wire 1a. By this preheating, the bond between the metal wire 1a and the synthetic resin 1b can be strengthened and the cutting strength can be increased.
[0041]
As shown in FIG. 6, the cooling device 30 circulates the water tank 31 provided with a pair of through-holes 31 a and 31 a that allow the resin-coated wire 1 </ b> A to pass straight and the cooling water flowing out from the through-hole 31 a to the water tank 31. Water tank 33 provided with a pair of through-holes 33a and 33a for allowing resin-coated wire 1A to pass through in a straight line, and cooling water flowing out of through-hole 33a. And a second cooling process constituted by a circulation path 34 for refluxing to 33. The water level of the cooling water in the water tanks 31 and 33 is set so as to be always higher than that of the resin-coated wire 1A. That is, the amount of cooling water returned to each water tank is set to be equal to or greater than the amount of cooling water flowing out from each water tank. Moreover, 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.
[0042]
As shown in FIG. 7, the take-out and delivery device 40 is composed of a pair of annular belt conveyors 41 and 41 that sandwich the resin-coated wire 1 </ b> A from above and below. The belt conveyors 41 and 41 are respectively wound around a pair of drive rollers 42 and 42, and along the feed path S while being in surface contact with the resin-coated wire 1A by the rotational drive of these drive rollers 42 and 42. To move.
[0043]
As shown in FIGS. 8 and 9, the coil forming machine 50 has a winding shaft 51 whose rotation axis is a direction substantially orthogonal to the feeding path S, and a coaxial arrangement with the winding shaft 51. And a plurality of sub pulleys 53 disposed around the main pulley 52. The winding shaft 51 and the main pulley 52 are rotatably mounted around a long pipe material 56 via a pair of left and right bearings 54 and 54 and a pair of left and right bearings 55 and 55, respectively. The rod 57 and the bolt 58 are fixed to the support plate 59 by fastening. In addition, a cap 60 that restricts the movement of the bearing 54 and a spacer 61 that restricts the movement of the bearing 55 are inserted into the end portion of the pipe material 56.
[0044]
The plurality of sub pulleys 53 are rotatably mounted around a short pipe member 63 via a pair of left and right bearings 62, 62, and the pipe member 63 is screwed into a bolt hole of the support plate 59. 64 is fixed to the support plate 59. The auxiliary pulley 53 and the main pulley 52 are set so that their outer peripheral surfaces are close to each other. Further, a spacer 65 for restricting the movement of the bearing 62 is inserted into the end portion of the pipe material 63.
[0045]
Feed grooves 52a and 53a are provided on the opposing surfaces of the main pulley 52 and the sub pulley 53, respectively, and 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 fed from the take-up and feeding device 40 proceeds along the molding path, and is formed into the spiral coil 1 based on the curved shape, and is directly applied to the winding shaft 51. Move sequentially along. Further, as shown in FIG. 8, when feed grooves 52b and 53b are provided next to the feed grooves 52a and 53a, respectively, and the number of turns of the resin-coated wire 1A is increased, an urging force that further reduces the coil pitch interval is provided. It can be applied to the coil 1. By providing the coil 1 with an urging force that reduces the pitch interval, the metal wire 1a is easily permanently deformed when the coil is extended, and the coil 1 is easily handled.
[0046]
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. A product holding shaft 66 that holds the coil 1 as a product to a predetermined length is connected to the end of the winding shaft 51. The coil 1 fed to the product holding shaft 66 may be cut to a desired length using an arbitrary cutting means. Moreover, since the length of the coil 1 in the non-stretched state when the cable is erected 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 when stretched can be easily understood. Good.
[0047]
Next, a method for manufacturing a cable laying coil using the manufacturing apparatus described above will be described. When manufacturing the cable laying coil using the manufacturing apparatus of the present embodiment, the metal wire 1a is supplied from the core wire supply unit 10, and the outer peripheral surface of the metal wire 1a is melted in the die 22 of the extrusion molding machine 20. The resin-coated wire 1A is formed by covering the synthetic resin 1b, and the resin-coated wire 1A is continuously led from the extrusion molding machine 20 to the coil molding machine 50, and is formed into the spiral coil 1 by the coil molding machine 50.
[0048]
Thus, since the resin-coated wire 1A is continuously guided from the extrusion molding machine 20 to the coil molding machine 50 and formed into the spiral coil 1, the extra heat treatment is eliminated and the physical properties of the metal wire 1a and the synthetic resin 1b are eliminated. The cable laying coil 1 can be continuously manufactured while avoiding deterioration.
[0049]
When an extra heat treatment is applied when manufacturing a cable laying coil 1 that is permanently deformed when stretched to some extent based on an appropriate balance between the plastic deformation of the metal wire 1a and the elastic deformation of the synthetic resin 1b. It becomes difficult to provide desired physical properties, and the manufacturing cost increases. However, in the manufacturing method of the above-described embodiment, it becomes possible to set optimum heat treatment conditions for the metal wire 1a and the synthetic resin 1b. Therefore, the high-quality cable laying coil 1 is manufactured at low cost by continuous production. be able to.
[0050]
Moreover, in the said embodiment, the feed path S is comprised linearly from the extrusion molding machine 20 to the coil molding machine 50, and the resin-coated wire 1A is linearly fed from the extrusion molding machine 20 to the coil molding machine 50. . By feeding the resin-coated wire 1A in a straight line in this manner, 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.
[0051]
In the extrusion process by the extrusion molding machine 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 die 22 is made of metal according to the supply speed of the metal wire 1a. It is rotated about the axis of the wire 1a so that only the outer shape of the synthetic resin 1b to be coated is twisted. As described above, when the outer shape of the synthetic resin 1b to be coated at the time of molding the resin-coated wire 1A is made non-circular and a twist that rotates the non-circular shape spirally is given, the distortion of the synthetic resin 1b is minimized. A twisted shape for reducing wind noise can be imparted to the cable laying coil 1.
[0052]
In the cooling process between the extrusion machine 20 and the coil molding machine 50, the cooling device 30 is used to cool the resin-coated wire 1A in a straight line. In this way, by cooling the resin-coated wire 1A in a straight line, distortion of the synthetic resin can be suppressed to a minimum. In particular, if the cooling process is composed of two stages and the cooling temperature is lowered step by step from the first cooling process to the second cooling process, the distortion suppressing effect on the synthetic resin 1b is further enhanced.
[0053]
In the drawing and feeding process between the extrusion molding machine 20 and the coil molding machine 50, the extrusion molding machine 20 is applied to the resin-coated wire 1A by the friction force caused by the surface contact of the belt conveyor 41 by using the above-described taking-up and feeding device 40. And is sent to the coil forming machine 50 as it is. Thus, since the belt conveyor 41 drives the resin-coated wire 1A while making contact with the resin-coated wire 1A over a wide area, the resin-coated wire 1A is not subjected to a large local force. Even if the resin 1b is in a soft state, the synthetic resin 1b does not become uneven.
[0054]
In the molding process by the coil molding machine 50, the resin-coated wire 1A is fed into a curved molding path formed around the main pulley 52 of the coil molding machine 50, and the spiral coil 1 is molded based on the curved shape. To do. Thus, by feeding the resin-coated wire 1A into the curved forming path and forming it in a spiral shape, the cable laying coil 1 can be continuously formed without stopping the feeding of the resin-coated wire 1A. . Further, in the coil molding machine 50, the coil 1 formed in a spiral shape 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 formation of the coil 1 for cable construction can be performed smoothly.
[0055]
If the initial strain in the synthetic resin 1b is substantially eliminated as described above, even if the coil 1 is extended when the cable is installed, the synthetic resin 1b will not be excessively strained and damage such as cracks will not easily occur. Therefore, corrosion of the metal wire 1a due to intrusion of rainwater or the like can be prevented over 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 operation can be further enhanced.
[0056]
【The invention's effect】
  As described above, according to the method for manufacturing a cable laying coil of the present invention, while a metal wire is traveling so as to pass through a die of an extrusion molding machine, a molten synthetic resin is supplied to the outer peripheral surface thereof. Forming into resin-coated wire, and continuously feeding the resin-coated wire to a coil forming machine without winding it up to form a spiral coilIn the method of manufacturing a cable laying coil, the coil molding machine includes a winding shaft having a rotation axis in a direction substantially orthogonal to a feeding path of the resin-coated wire, and coaxial with the winding shaft. A main pulley arranged and a plurality of sub pulleys arranged around the main pulley, and a feed groove is provided on each of the opposing surfaces of the main pulley and the sub pulley, and the feed around the main pulley. Using a coil forming machine that forms a curved forming path that passes through the groove, the resin-coated wire is formed into a spiral coil based on the curved shape of the forming path, and the spirally formed coil is wound around the coil. It was moved sequentially along the take-off axis and pulled in a direction substantially perpendicular to the supply direction of the resin-coated wire.Based on a reasonable balance between plastic deformation of the metal wire and elastic deformation of the synthetic resin, it is permanently deformed when stretched to some extent, thereby holding the cable in a stable state during and after installation. The cable laying coil can be manufactured with high quality and at low cost.
[0057]
  The cable laying coil manufacturing apparatus according to the present invention supplies a metal wire from a core wire supply unit, and coats the outer peripheral surface of the metal wire with a synthetic resin in a molten state in a die of an extruder. A wire is formed, and the resin-coated wire is passed through a feeding path provided with a cooling device and a take-out and feeding device.From the extruderContinuously guided to a coil forming machine, and configured to be formed into a spiral coil with the coil forming machine.In the cable laying coil manufacturing apparatus, the coil forming machine includes a winding shaft whose rotation axis is a direction substantially orthogonal to the feeding path, and a main shaft disposed coaxially with the winding shaft. A pulley, and a plurality of auxiliary pulleys arranged around the main pulley, and a feed groove is provided on each of the opposing surfaces of the main pulley and the auxiliary pulley, and a curve passing through the feed groove around the main pulley. The resin-coated wire is formed into a spiral coil based on the curved shape of the molding path, and the coil is sequentially moved along the winding shaft.Therefore, the cable laying coil can be manufactured with high quality and at low cost based on the above manufacturing method.
[Brief description of the drawings]
1A and 1B show an example of a cable laying coil according to the present invention, in which FIG. 1A is a side view of the coil, FIG. 1B is a cross-sectional view of a resin-coated wire constituting the coil, It is a side view.
2 is a side view showing a state in which a cable is installed using the cable laying coil shown in FIG. 1. FIG.
FIG. 3 is a top view showing an apparatus for manufacturing a cable laying coil according to an embodiment of the present invention.
4 is a cross-sectional view showing a straightening machine constituting the manufacturing apparatus of FIG. 3;
5 is an enlarged sectional view showing a head portion of an extrusion molding machine constituting the manufacturing apparatus of FIG. 3. FIG.
6 is a cross-sectional view showing a cooling device constituting the manufacturing apparatus of FIG. 3;
7 is a side view showing a take-out and delivery apparatus that constitutes the manufacturing apparatus of FIG. 3; FIG.
8 is a cross-sectional view showing a coil forming machine constituting the manufacturing apparatus of FIG. 3;
9 is a view taken in the direction of arrows XX in FIG.
[Explanation of symbols]
1 Coil 1a Metal wire
1b Synthetic resin 1X Resin coated wire
10 Core wire supply unit 20 Extruder
21 Head 22 Base
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 Feeding path

Claims (10)

While running the metal wire so that it passes through the die of the extrusion molding machine, a synthetic resin in a molten state is supplied to the outer peripheral surface to form a resin-coated wire, and the coil is continuously wound without winding the resin-coated wire once. A method for manufacturing a cable laying coil that is continuously supplied to a molding machine and formed into a spiral coil ,
As the coil forming machine, a winding shaft having a rotation axis in a direction substantially orthogonal to the feeding path of the resin-coated wire, a main pulley arranged coaxially with the winding shaft, A plurality of auxiliary pulleys arranged around the pulley, and a feed groove is provided on each of the opposing surfaces of the main pulley and the auxiliary pulley, and a curved forming path passing through the feed groove is formed around the main pulley. The coil-coated machine is used to form the resin-coated wire into a spiral coil based on the curved shape of the molding path, and the spirally formed coil is sequentially moved along the winding shaft. A method for manufacturing a cable laying coil that is pulled in a direction substantially orthogonal to a supply direction of the resin-coated wire .   2. The molding of the resin-coated wire, wherein the outer shape of the coating resin in the cross section of the resin-coated wire is made non-circular, and the non-circular shape is twisted so as to rotate spirally along the longitudinal direction. The manufacturing method of the coil for coil construction of description.   The method for producing a cable laying coil according to claim 1 or 2, wherein the resin-coated wire is linearly fed from the extrusion molding machine to the coil molding machine.   The method for producing a cable laying coil according to claim 3, wherein the resin-coated wire is cooled in a straight line between the extrusion molding machine and the coil molding machine.   The method for producing a cable laying coil according to claim 3 or 4, wherein the resin-coated wire is taken out from the extrusion molding machine by using a frictional force of surface contact and subsequently sent out to the coil molding machine. A metal wire is supplied from the core wire supply unit, and the outer peripheral surface of the metal wire is coated with a molten synthetic resin in a die of an extruder to form a resin-coated wire, and the resin-coated wire is drawn with a cooling device. Manufacture of a cable laying coil configured to be continuously guided from the extrusion molding machine to a coil molding machine through a feeding path equipped with a take-out and delivery device and formed into a spiral coil by the coil molding machine. A device,
The coil forming machine includes a winding shaft having a rotation axis in a direction substantially orthogonal to the feeding path, a main pulley disposed coaxially with the winding shaft, and a periphery of the main pulley. A plurality of sub pulleys arranged, and a feed groove is provided on each of the opposing surfaces of the main pulley and the sub pulley, and a curved forming path passing through the feed groove is formed around the main pulley. An apparatus for manufacturing a cable laying coil, wherein the resin-coated wire is formed into a spiral coil based on a curved shape of a road, and the coil is sequentially moved along the winding shaft . The extrusion molding machine includes a head part that supplies a synthetic resin in a molten state around the metal wire, and a die that defines an outer shape of the resin-coated wire in the head part, and the die is used to supply the metal wire. The apparatus for producing a cable laying coil according to claim 6 , wherein the coil is rotated about the axis of the metal wire in accordance with the speed. The apparatus for manufacturing a cable laying coil according to claim 6 or 7 , wherein a feeding path from the extrusion molding machine to the coil molding machine is configured in a straight line. The cooling device includes a water tank provided with a through-hole through which the resin-coated wire passes in a straight line, and a circulation path for returning the cooling water flowing out from the through-hole to the water tank, and the cooling water in the water tank The apparatus for manufacturing a cable laying coil according to claim 8 , wherein the water level is set to be always higher than the resin-coated wire. The apparatus for manufacturing a cable laying coil according to claim 8 or 9 , wherein the take-out and delivery device is constituted by a pair of belt conveyors sandwiching the resin-coated wire.

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