JPH02210723A - Manufacturing device for covered cable - Google Patents

Abstract

PURPOSE:To greatly reduce a rotary driving force and make the size of a motor small and compact the motor by installing an inversion driving means of core material which reciprocally inverts at a fixed period while a cable core material is allowed to move it on this side of a covered layer extension molding machine in the direction of its axial center. CONSTITUTION:A core material inversion driving means 9 which makes a cable core material 2 to be reciprocally inverted around its axial center at a fixed period is installed on this side of a covered layer extrusion molding machine while the cable core material 2 is allowed to move in its axial direction. It is possible, therefore, to make the core material 2 to be rotated only in one direction, but also make it to be reciprocally inverted at a fixed period, and when the core material 2 normally turns, this core material 2 is twisted, but when it is reciprocally inverted, the twist is released. That is, if an inversion action is set such that the core material 2 can be reciprocally turned before a resiliency generated in the core material 2 by twisting at the time of normal increases, it is possible to reduce a rotary driving force. Thereby, the motor can be made small in size and compact.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a coated cable manufacturing apparatus for manufacturing high-voltage electric cables, etc., and particularly to a coated cable manufacturing apparatus having a horizontal or catenary type coated cable manufacturing line. It is.

(Prior art and its problems) Figure 1 shows a catenary-type coated cable manufacturing device.
Figure 2 shows a horizontal (horizontal type) coated cable manufacturing device, and the cable core material 2, such as stranded wire or solid wire, supplied from the supply drum 1 (not shown in Figure 1) is of the catenary type. via supply capstan 3,
In the case of a horizontal type, the cable is directly sent to a coating layer extrusion molding machine 5, where a coating layer of a predetermined thickness is formed around the cable core material 2, and then passed through a splice box 5 to a vulcanized tube 6.
The coating layer is vulcanized and cooled to sufficiently solidify and cool, and then wound onto a winding drum via a tick-up capstan (not shown).

In such a horizontal or catenary type coated cable manufacturing device, since the cable core material 2 is oriented horizontally when the coating layer is formed, the coating layer formed around the core material 2 by the coating layer extrusion molding machine 4 is The material, that is, the covering material, tends to hang down from the core material 2 due to its own weight before it is vulcanized and hardened. This tendency becomes stronger as the thickness of the coating layer increases.
For example, when manufacturing a coated cable 8 having a thick coating layer 7 as shown in FIG. 3, an extrusion molding machine 4 as shown in FIG.
The coating layer 7, which is formed into a concentric perfect circle around the core material 2, gradually hangs down from the core material 2 due to its own weight while passing through the vulcanized layer 6, as shown in FIG. 3B. ,
When vulcanization and curing are completed, a reddish coating layer 7 with uneven thickness is formed as shown in FIG. 3C, resulting in a defective product.

Therefore, conventionally, when manufacturing a coated cable with a thick coating layer as described above, a device was used in which gravity does not act on the cable core material in the radial direction, that is, the core material 2 was lowered vertically. They were forced to use vertical manufacturing equipment. Such vertical manufacturing equipment not only has poor workability compared to the horizontal or catenary manufacturing equipment described above, but also requires a high-rise building to increase productivity, which inevitably increases costs. increases.

(Means for Solving the Problems) The present invention proposes a coated cable manufacturing apparatus that can solve the conventional problems as described above, and its features are as follows:
In a horizontal or catenary type coated cable production line, a core material reversal drive is installed before the coating layer extrusion molding machine to rotate the cable core material forward and backward around the axis at a constant cycle while allowing the cable core material to move in the axial direction. The point is that we have provided the means.

(Operation of the invention) In the apparatus of the present invention having such a configuration, a coating layer of a predetermined thickness is formed by the extrusion molding machine on the cable core material passing through the coating layer extrusion molding machine, and this coating layer is As in the past, coated cables can be manufactured continuously by vulcanization and hardening in a vulcanized tube and cooling.
The cable core material moves within the extrusion molding machine and the vulcanization tube while being rotated about its axis by the core material reversal drive means, so that it is extruded from the extrusion molding machine and the core material is rotated around its axis by the core material reversing drive means. The covering material that forms the material covering layer also rotates together with the core material, and cannot hang down continuously under its own weight directly below the core material.Therefore, the covering layer is approximately concentric with the core material in a perfect circle. The cross-sectional shape of the coating layer is maintained during vulcanization and hardening, and uneven thickness due to gravity can be prevented from occurring in the coating layer.

Moreover, in this case, the cable core material is not rotated only in one direction, but is rotated in forward and reverse directions at regular intervals, so that even if it is twisted during forward rotation, the twist is undone when it is reversed. Incidentally, if the cable core material is rotated in only one direction, twist will gradually accumulate as the cable core rotates, and the repulsion force will increase accordingly.
The driving force for rotating the cable core must be correspondingly increased, and therefore a large driving source is required.

However, in the present invention, if the reversing operation is set so that the core material is reversed before the anti-ta force generated in the core material due to twisting during forward rotation increases, the rotational driving force can be reduced. The motor is also small and compact. In fact, a satisfactory effect can be obtained by repeatedly inverting the cable core several times every half or one turn until the coating layer is completely cured. .

When reversing the cable core material by the core material reversing drive means, the core material may be driven in forward and reverse directions at every predetermined rotation angle regardless of the rotation speed of the cable core material, or alternatively, the cable core material may be reversely driven in forward and reverse directions at predetermined rotation angles, regardless of the rotation speed of the cable core material. If the material rotation speed is known, a timer may be used to set the time to drive the material in forward and reverse directions.

(Embodiment) An embodiment of the present invention will be described below based on the attached illustrative drawings.According to the present invention, as shown by phantom lines in FIGS. A core material reversing drive means 9 is disposed in the core material moving path in front of the core material moving path. As shown in FIGS. 4 to 6, this core material reversal driving means 9 includes a rotary body 11 pivotally supported by a fixed frame 10, and a speed changer that drives the rotary body 11 in forward and reverse directions through a speed reducer 12. The motor 13 is equipped with a motor that can be rotated in forward and reverse directions, and detects that the rotating body 11 has rotated by a predetermined angle.
a detection single stage 14 for reversing the rotating body 1;
1 includes a cylindrical rotating frame 16 in which rollers 15a and 15b for crimping the cable core 2 from both sides in the diametrical direction are installed at two locations in the front and back in the longitudinal direction of the core; Projected cylinder shaft portions 17a, 1
7b, and the double cylinder shaft portions 17a, 17
At b, it is rotatably supported on the fixed frame 10 by bearings tea, 18b. The reducer 12 and the rotating body 11 are connected to one sleeve portion 17a and the reducer 1.
The gear wheels 19a and 19b mounted on the second output shaft are interlocked and connected by a chain 220 suspended between both gear wheels. Further, the detection means 14 includes a dog 21 provided at a required location on the outer peripheral surface of the rotating frame 16, and a dog 21 provided at a required location on the outer peripheral surface of the rotating frame
and a pair of limit switches 22 and 23 installed at an angle θ in the circumferential direction on the outer side of the rotating frame 16, which can face the rotating body 11.
When the dog 21 on the rotating frame 16 kicks the limit switch 22 on the right side of the figure when it is assumed to be rotating clockwise in the figure, this limit switch 22 is activated and the motor 13 is operated in reverse by the operation signal. , whereby the rotating body 11 begins to rotate in reverse, that is, counterclockwise. Then, when the rotating body has rotated by an angle θ from the starting point of its reverse rotation, the dog 21 kicks the left limit switch 23, and the motor 13 is operated in the reverse direction by the operation signal generated by the activation of the limit switch 23, and the rotating body 11 is rotated clockwise again. rotate around. Thereafter, similar operations are repeated, and the rotating body 11 is reversed every time it rotates by a predetermined angle θ.

The core material crimping rollers 15a and 15b are drum-shaped rollers for positioning the cable core material 2, and although not shown in the drawings, the core material crimping rollers 15a and 15b are crimped by springs to allow the cable core material 2 to move in the axial direction. There is.

Before the cable core material 2 is introduced into the coating layer extrusion molding machine 4, the cable core material 2 is passed through the rotary body 11 of the core material reversal drive means 9, inside the cylindrical shaft portions 17a and 17b at both ends, and into the two sets of core material pressing rollers 15a.
, 15b. Therefore, when the rotary body 11 is driven in forward and reverse directions at a predetermined speed by the forward/reverse motor 13 with a transmission, the core material pressure bonding rollers 15a and 15b pivotally supported within the rotary body 11 will move around the axis of the rotary body 11, In other words, since the cable core material 2 revolves around the cable core material 2 in the forward and reverse directions, the cable core material 2, which is moving in the axial direction while being crimped by the S-rollers 15a and 15b, rotates in the forward and reverse directions around its axis. It will be forced to rotate in the same direction.

However, as in the conventional case, the cable core material 2 is introduced into the vulcanized pipe 6 via the splice box 5 after a coating layer of a predetermined thickness is formed in the coating layer extrusion molding machine 4. The cable core material 2 is vulcanized and hardened and cooled while moving within the cable core material 2, and as described above, the cable core material 2 is rotated about its axis at a predetermined speed by the core material reversal drive means 9. Therefore, even if the sheathing material forming the sheathing layer 7 around the core material 2 tries to hang down directly below the core material 2 due to its own weight as shown in FIG. 7A, the sheathing material will not fall as shown in FIG. 7B. is lifted above the core material as the core material 2 rotates, and finally a high-quality covering layer 7 is formed that is approximately concentric and perfectly circular with respect to the core material 2, as shown in FIG. 7C. Cable 8 will be manufactured. Moreover, in this case,
Since the cable core material 2 is rotated forward and reverse at regular intervals, for example, every half rotation, even if it is twisted during normal rotation, the twist is returned by reversal before the reaction force generated by the twist increases, and therefore, The repulsion force generated in the core material is extremely small.

Note that the core material reversing drive means 9 is not limited to the structure of the above embodiment, as long as it can reversely reverse the cable core material 2 around the axis while allowing its axial movement. In the core material reversal driving means 9 of the embodiment, the detecting means 14 is used to cause the core material 2 to rotate forward and reverse at a predetermined angle regardless of the rotation speed of the cable core material 2. If the speed of the coated cable production line and the rotation speed of the cable core material 2 are known, a timer may be used to set the reversal time and the reversal may be performed in the forward or reverse direction at each set time.

(Effects of the Invention) As described above, according to the coated cable manufacturing apparatus of the present invention,
- Even if it is a coated cable with a thick coating layer, which could not be manufactured on a horizontal or catenary production line such as a boat fishing line due to the phenomenon of uneven thickness due to the coating layer's own weight, the horizontal type Or, in a catenary type production line, the coating layer may be uneven because the core material reversal drive means is used to rotate the core material not only in one direction, but to rotate it in the forward and reverse directions at regular intervals. Even if the core material is twisted when it rotates in the normal direction, the twist will return when it rotates in the reverse direction.Therefore, the reversal operation is set so that the twist during the normal rotation causes the twist to reverse until the resultant force increases. As a result, the rotational driving force can be significantly reduced, and it is therefore possible to use a small and compact motor as the driving source.

[Brief explanation of the drawing]

Figure 1 is a schematic side view showing the main parts of a catenary-type coated cable manufacturing equipment, Figure 2 is a schematic side view showing the main parts of a horizontal type coated cable manufacturing equipment, and Figure 3 shows uneven thickness of the covering layer due to its own weight. 4 is a plan view illustrating the core material rotation drive means, FIG. 5 is a longitudinal sectional front view of the same, FIG. 6 is a longitudinal sectional side view of the same, and FIG. It is a figure explaining the process by which the meat phenomenon is resolved. 1... Cable core material, 4... Covering layer extrusion molding machine, 6
... Vulcanized pipe, 7 ... Covering layer, 8 ... Covered cable, 9 ... Core material rotation drive means, 11 ... Rotating body, 12
...Reducer, 13...Motor with reducer, 14.
...Detection means, 15a, 15b...Core material pressure bonding roller, 17a, 17b...Cylinder shaft portion, 18a, 18b...
Bearing, 20...Che 7.21...Dog, 22.23
···Limit switch.

Claims (1)

[Claims] In a horizontal or catenary type coated cable production line, a core material reversal drive is installed before the coating layer extrusion molding machine to rotate the cable core material forward and backward around the axis at a constant cycle while allowing the cable core material to move in the axial direction. A coated cable manufacturing device comprising a means.