JPH0440811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a hollow conductor stranded cable formed by twisting hollow conductors.

(Prior Art) Conventionally, as shown in the cross-sectional view in FIG. 2 as a single-form power cable, an insulator 2 made of a plastic material or the like is attached to the outer periphery of a plurality (three in the figure) of hollow conductors 1. Hollow conductor stranded cable ( (hereinafter simply referred to as hollow conductor cable) is known.

Such a hollow conductor cable contributes to cable management by introducing a sensor made of a non-electromagnetic inductive material such as an optical fiber, which protects the conductor by introducing a heating medium into the hollow of the conductor to prevent overheating or overcooling. It has been proposed to improve the functionality of the conductor by introducing various objects or substances into the hollow space, such as using it as a spacer for communication optical fibers. It is considered reasonable to use hollow conductor cables.

However, such a long hollow conductor cable is
A long plate is bent into a cylindrical shape, welded to form a tubular body, and then subjected to drawing processing to produce the required hollow conductor.Then, this hollow conductor is passed through an insulator extruder to form an insulated hollow conductor. After that, the cables are twisted using various types of twisting machines, and further, in the case of making a sheathed cable, they are produced through an inclusion extruder and a sheath extruder.

(Problems to be Solved by the Invention) However, in such conventional manufacturing methods, manufacturing the hollow conductor itself is extremely troublesome, and the manufacturing process of the hollow conductor, the process of covering the insulator, and the process of twisting the wires are all separate processes. Because of this, the entire manufacturing process is complicated and continuous mass production is impossible. In addition, the manufacturing equipment becomes larger and requires a large installation area, and in each process it is necessary to repeatedly wind semi-finished products on drums and transport them to the next process, resulting in unnecessary power and unnecessary winding due to duplication of drum winding. There are disadvantages such as the need for transportation.

The present invention has been made by focusing on such drawbacks associated with the production of conventional hollow conductor cables, and it simplifies the manufacturing process of hollow conductors and eliminates the subsequent steps of insulator coating and stranding of hollow conductors. The purpose of this invention is to provide a method that can be integrated with the manufacturing process to streamline the entire manufacturing process, downsize the equipment, reduce the installation area, and reduce power consumption, etc., and allows easy and unlimited continuous manufacturing.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a rough line for extrusion molding, and a plurality of dies arranged in a circle on a rotating body of an extrusion molding machine. a step of extruding a plurality of hollow conductors from an annular hole formed by a core inserted into an extrusion hole of the die; and an insulator covering member that rotates in synchronization with the rotating body and corresponds to each of the dies. A step of inserting the hollow conductor extruded from each die into the corresponding insulator covering member into an insulator-coated rotary bed equipped with a rotating body having a circular shape penetrated through the insulator, and covering the insulator with the insulator; The main feature of this method is the process of twisting the body-covered hollow conductors by winding them together through a twisting opening.

The present invention will be explained in more detail below on the basis of the accompanying drawings showing examples.

FIG. 1 shows an overall explanatory diagram of the hollow conductor cable manufacturing apparatus of the present invention.

In the figure, 6 is an extrusion molding machine equipped with an extrusion rotary head for obtaining the hollow conductor 3, 7 is a supply drum for supplying the rough wire 8 to the extrusion molding machine 6, 9 is a motor for driving the extrusion rotary head, and 10 is a speed reducer.

The extrusion molding machine 6 is disclosed, for example, in Japanese Patent Publication No. 59-36716, in which the extrusion rotary head as shown in the cross-sectional view in FIG. 3 is reformed, and the extrusion die has a structure as shown in FIG. 4. is used. That is, in FIGS. 3a and 3b, 11 is a rotating body rotated by the motor 9 and the speed reducer 10. An annular groove 12 having a pocket 13 at the bottom of the groove is formed in the outer periphery of the rotating body 11, and an annular fixed shoe member 14 is engaged with the groove 12. The fixed shoe member 14 has a wire rod passage a for supplying the material (rough wire), and a guide roll 45 for feeding the rough wire is provided at the entrance thereof, and the inner circumferential surface of the fixed shoe member 14 is connected to a rotating body. 11 (direction of arrow mark b), the amount of protrusion into the groove 12 gradually increases, and the cross-sectional area of the pocket 13 formed by the groove 12, the groove bottom, and the inner circumferential wall of the fixed shoe gradually decreases. It is set as. In addition, the rotating body 11 has
A plurality of dies 17 are arranged in a circle facing this pocket 13. Reference numeral 18 denotes a core that is mounted in the rotating body 11 by means of screwing or the like, facing the die 17, and has a narrow diameter portion 18a protruding from its end.
The narrow diameter part 18a of the core 18 is inserted into the extrusion hole,
An annular hole 19 for extrusion is formed by the die 17 and the narrow diameter portion 18a.

In FIG. 1, 20 is a cooler connected to the extrusion molding machine 6, 21 is an insulator-coated rotary head connected to the cooler 20, and a drive motor 23 and a reduction gear are mounted on a sliding base 22. It is installed together with 24. Further, 25 is a known plastic extruder.

Details of the insulator-covered rotary head 21 are shown in half-section in FIG. That is, 26 is a rotating body that is driven to rotate at the same speed in synchronization with the rotating body 11 of the extrusion molding machine 6 via a sprocket 27, 28 is an annular groove provided on the outer periphery of the rotating body 26, and 29 is an annular groove. A pocket 28 communicates with the groove bottom, 30 a fixed shoe member partially fitted into the annular groove 28, and 31 a housing. Reference numeral 32 denotes an insulator coating means provided in the axial direction of the rotating body 26, and is constructed by connecting a core bar 33 and a cap 34 through a slit 35, and the slit 35 is connected from the pocket 29 into the cap 34. are doing. A plurality of insulator coating means 32 are inserted through the rotary body 26 in correspondence with the dies 17 provided on the rotary body 11 of the extrusion molding machine 6. In addition,
36 is a bearing.

Next, in FIG. 1, 37 is a cooling tank connected to the insulator-coated rotary head 21, and 38 is a cooling tank 3.
7 is a continuous twisting opening, 39 is a twisted hollow conductor cable, 40 is a winding capstan, 4
1 is a winding drum, and 42 is a motor for driving the winding drum.

(Function) In the device configured as described above, first, the rough wire 8 as a material is passed from the wire passage a of the fixed shoe member 14 to the pocket 13 along the guide roll 45.
Supplied internally. As the rotating body 11 rotates, the wire rod supplied into the pocket 13 advances to fill the inside of the pocket 3 due to its frictional force. Since the pocket 13 has a structure in which the cross-sectional area gradually decreases, the material progresses while being compressed, and when a predetermined compressive stress is reached,
The hollow conductor 1 having a desired wire diameter is continuously extruded by a die 17. The hollow conductor 1 thus extruded is rotating together with the rotating body 11. The extruded hollow conductor 1 is cooled by a cooler 20 and introduced into a core bar 33 in a rotating body 26 of an insulator-coated rotary head 21 which is rotated in synchronization with the rotating body 11. On the other hand, the insulator-covered rotating head 21
An insulating material such as PVC heated and fluidized by a plastic extruder 25 is supplied to the pocket 29 through a supply path (not shown), and a hollow conductor is transferred from the tip of the core metal 33 to the base 34 via a slit 35. The outer periphery of 1 is continuously coated. The hollow conductor 3 coated with an insulator is then placed in a cooling tank 37.
The fibers are cooled at the twisting port 38 and twisted together at the twisting port 38. In the above process, the plurality of hollow conductors rotated parallel to the delivery direction and sent out from the die 17 provided in the extrusion rotating head of the extrusion molding machine 6 are transferred to the cooler 20, the insulator-covered rotating head 21, It continues to rotate in the same way until it reaches the twisting port 38 through the cooling tank 37, and at the twisting port 38, 1
They are gathered in one place and twisted together by the rotational force.

The twisted insulated hollow conductor 3 is wound onto a winding drum 41 via a winding capstan 40.
In addition, when manufacturing a hollow conductor cable with a cross section shown in FIG. 2 by covering the twisted insulated hollow conductors 3 with the inclusions 4 and the sheath 5, the twist openings 38
An inclusion extruder, sheath extruder, and cooling tank (not shown) are installed between the winding capstan 40 and the winding capstan 40, respectively.
It can be produced by conventional methods.

(Effects of the invention) The method for manufacturing a hollow conductor stranded cable of the present invention includes:
Consisting of the structure and operation explained in detail above,
The hollow conductor itself can be manufactured extremely easily, and
The hollow conductor is coated with an insulator using an insulator coating means that rotates in synchronization with the rotating body of the extrusion molding machine, and the insulator coated hollow conductor is twisted using the rotational force. Because of this, the hollow conductor manufacturing process, insulator coating process, and wire stranding process are integrated, making continuous mass production possible. Furthermore, the entire manufacturing equipment has been downsized and its installation area has been significantly reduced, and the wasted power required for duplication of drum winding of semi-finished products in each process has been greatly reduced, making it easier to manufacture hollow conductor stranded cables. It has the remarkable advantage of being able to achieve revolutionary rationalization of the process.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the overall configuration of an apparatus for manufacturing a hollow conductor stranded cable according to the present invention, FIG. 2 is a cross-sectional view of an embodiment of the cable manufactured according to the present invention, and FIG. FIG. 4 is a diagram showing details of the extrusion molding machine in FIG. 1, in which a is a partially broken side view seen from B in FIG.
FIG. 5 is an enlarged sectional view of the portion shown in FIG. 3, and FIG. 5 is a front view including a half cross section of the insulator-coated rotary head as viewed from D in FIG. DESCRIPTION OF SYMBOLS 1... Elemental wire, 3... Insulator-covered strand, 6... Extrusion molding machine, 8... Rough wire, 11... Rotating body, 12
. . . Annular groove, 13 .
Rotating body, 28... Annular groove (of the insulator-covered rotating head), 29... Pocket (of the insulator-covered rotating head), 30... Fixed shoe member (of the insulator-covered rotating head), 32... Insulator Covering member, 38...
Twisting opening, 39...twisted hollow conductor cable, 41... winding drum.

Claims (1)

[Scope of Claims] 1 A rough wire is supplied to an extrusion molding machine, and the molding machine is formed by a plurality of dies arranged in a circle on a rotating body of the extrusion molding machine and a core inserted into an extrusion hole of the dies. extrusion-molding a plurality of hollow conductors from an annular hole; and an insulator comprising a rotating body that rotates in synchronization with the rotating body and has insulator covering members corresponding to each of the dies penetrated in a circular shape. A step of inserting the hollow conductor extruded from each die into the covered rotary bed through the corresponding insulator covering member to cover the insulator, and winding the insulator covered hollow conductor together through the twisting opening. A method for producing a hollow conductor stranded cable, comprising the step of twisting.