JPS6353816A - Cable rotation preventor for continuously vulcanizing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for eliminating rotation due to untwisting of cables in a continuous vulcanizer mainly used for manufacturing electric cables.

[Conventional technology and its problems]

'Catenary type,
Inclined, horizontal, and vertical vulcanizers are known, but it is difficult to manufacture cables with a large ratio of the thickness of the rubber or plastic insulation layer to the conductor diameter with the former three vulcanizers.

During crosslinking in the vulcanized tube, the eccentricity of the insulating layer increases due to the influence of gravity, making it impossible to make a good cable.

As a countermeasure for this, in advance, the extrusion thickness of the insulating layer should be adjusted to be less than 1 mm thicker on the side where the thickness is reduced due to sagging than on the side where the thickness is increased by an amount equivalent to the eccentricity, using the gouge part of the crosshead at the inlet of the vulcanized tube. Although it is possible to eliminate uneven thickness by reducing the eccentricity during extrusion by a sagging phenomenon, it is by no means easy to implement this method. This is because if the side where the thickness decreases due to gravity is defined as 3 points and the side where the thickness increases is defined as point b, it is necessary to know points a and b at the crosshead.

However, the vulcanization tube has no pressure capacity and cannot be opened during operation due to internal pressure. Therefore, points a and b at the crosshead part can be determined by measuring the eccentricity at the end seal 811 part of the vulcanized tube, which is the only measurable part, and determining the position of points a and b at the end seal part. However, it is extremely difficult to match this position. The reason for this is that the cable rotates under the influence of twisting during cross-linking.

That is, in general, conductors for power cables are made by twisting together a plurality of thin single wires. For example, one mainly single wire,
They are twisted in many layers, with 6 around the outer circumference and 12 on top. When tension is applied to such conductors, they twist in the untwisted direction.

On the other hand, if we take a catenary type continuous vulcanizer (CCV) as an example, the tension applied to the cable is the sum of the catenary constant number multiplied by the cable unit type 1, which is a considerably large tension. This tension causes the cable to untwist and rotate between the metering capstan placed in front of the crosshead and the tensioning capstan placed behind the end seal. Furthermore, the number of rotations varies depending on the structure of the conductor and the length of the vulcanized tube. For this reason, even if you check points a and b at the end seal outlet and the amount of control, you will not know where points a and b are at the crosshead, and there will be no way to adjust the eccentricity.

One method is to scratch the die of the crosshead, use the scratches to make lines on the cable surface, and use these lines as a reference to determine the position. Since the position of the part is subject to the influence of sagging due to gravity, it is not possible to determine the exact number of revolutions, so this method cannot necessarily be said to be successful. Furthermore, it is also undesirable to damage the surface of the cable as a product.

The inventors believe that if it is possible to manufacture the cable without rotating it, the a +
Focusing on the fact that the position of point b can be easily adjusted and there is no need to damage the cable surface, we have developed the device of the present invention that can eliminate the rotation of the cable in the cross-linked pipe. be.

[Means for solving problems]

The cable rotation prevention device of the present invention solves the above problems, and the cable runs at the end sole exit part of the vulcanized tube.
(Cable gripping means consisting of a pair of roller groups or a pair of can end belts including caterpillars or a combination thereof; and a roller group of the gripping means fixed rotatably around the path line of the cable. or a frame that rotatably supports the support roller of the can end belt, and a drive motor that rotates the frame together with the cable held by the holding means in a direction opposite to the direction of rotation due to the untwisting force of the cable, the same number of rotations as the rotation speed. It consists of

[Effect]

If the cable during cross-linking is reversed the same number of times as the number of rotations due to untwisting, the actual number of rotations of the cable becomes zero, and points a and b at the crosshead correspond to the position at the end seal exit [ ]. . Generally, point a at the crosshead is on the upper side of the cable and point b is on the lower side of the cable, and the same is true at the end seal outlet. Therefore, based on the amount of saliva at the end seal outlet, if the position of the die is adjusted so that the extrusion thickness on the side of point a at the cross head is thicker, or the amount of sag is adjusted, the sag phenomenon has already stopped. The eccentricity of the insulating layer at the end seal portion is naturally corrected to zero during crosslinking.

Therefore, according to the present invention, it is possible to manufacture a high-quality thick-walled insulated cable even with a vulcanization device that is affected by gravity.

〔Example〕

The accompanying drawings show embodiments of the invention.

FIG. 2 shows the location of the anti-rotation device 10 of the present invention when it is employed in a CCV. In the figure, 1 is the cable, 2 is the metering capstan that feeds out the conductor,
3 is an insulating material extruder, 4 is a vulcanizing W, 5 is an end seal, and 6 is a tensioning capstan. A device 10 is installed at the exit L portion of the end seal 5 as shown in the figure.

FIG. 1 shows a specific example of the anti-rotation device 10. As shown in FIG.

As shown in the figure, on both sides of the cable pass line L,
A plurality of rollers 11 are arranged parallel to the line L, respectively. The group of rollers lined up on one side of the pass line can be rotated and supported by the movable frame 12 with their spindles oriented at right angles to the line L, and the roller group on the pond side is similarly supported by the movable frame 13.Cables is passed between this pair of roller groups and held by the V-groove surface of each roller.

14, in order to enable gripping of cables of different diameters,
This is a gap adjustment mechanism between gripping surfaces provided as necessary. This adjustment mechanism includes links 14a, which are provided with two hinge-connected links to each of the frames 12 and 13, or a plurality of pairs (two pairs in the figure), or links 14a, which are provided at different positions in the longitudinal direction of the pass line, and are positioned parallel to the pass line L. (This threaded shaft 14b is screwed into the threaded part of the shaft, and one end of the pair link 14a is hinged.) From the worm wheel 14d fixed to the lock 14C1 screw shaft and the worm 14e meshed with it. A worm gear consisting of a worm gear, an id rod 14 passed through an eye bracket of the frame 12.13, and a handle or motor (not shown) connected to the worm rotates the worm 14e and moves the pairs of roller groups together with the frame 12.13 toward each other. The structure is not particularly limited to this structure, but may be moved in parallel in the direction of approach or separation.

15 is a cylindrical frame that supports the screw shaft 14b and the guide rod 14. This cylindrical frame has a cylindrical support shaft 17 arranged concentrically on the pass line L and supported by a fixed member 16, and can rotate together with the support shaft around the pass line.

18 is two sprocket wheels 18a, large and small.

Endless belt 1 passed between 18b and both wheels
This is a power transmission mechanism to a support shaft 17 made of 8C, and a shaft 18d to which a small sprocket wheel 18b is attached is connected via a clutch 19 to a drive motor 20 with a transmission. 21 is a switching lever of the clutch 19.

In the illustrated device 10 constructed as described above, both the cylindrical frame 15 and the roller group are rotated in a direction opposite to the rotational direction of the cable by the power from the motor 20, and the rotation force is transmitted from the roller group to the cable. Ru.

Note that the rotation speed of the cylindrical frame 15 is controlled to be the same as the white 1 transmission of the cable. There are two possible control methods at this time: One of them is to set the clutch 19 of the device 10 in neutral and the support shaft 17 or shaft 18d.
By detecting the number of rotations of the cable with a sensor (not shown), it can be determined whether the number of rotations is Since V can also be determined, after this, engage the clutch 19 and first rotate the frame 15 in the opposite direction to the X-rotation direction, and then obtain the previously determined speed V.
The frame 15 is rotated at the same speed in the opposite direction to the rotation direction to correct the amount of rotation and perform crosslinking. Next, when the cross-linked cable exits the end seal in this state, the uneven thickness of the insulating layer is measured, and the crosshead position is moved by 1 degree in the direction where the eccentricity is finally eliminated. From then on, the method is to correct the rotation by rotating the frame 15 at a speed of (2) and continue S crosslinking.

Another method is to provide a rotation detection device other than the device 10 (this device may also be based on the device 10 of the present application) between the device 1o and the end sole 5. Therefore, the former method is a method of performing control similar to Ma based on the detected rotation number X and self-transfer degree V. In this latter method, the value of V, which may change during crosslinking, is constantly determined and the rotation can be accurately corrected based on that value, so there is no accumulation of correction errors, and the initial rotation speed can be used as the subsequent rotation speed. This method is more reliable than the former method. In any case, such control is only possible with the anti-rotation device of the present invention.

The cable gripping means may be one in which a pair of endless belts such as caterpillars or rubber belts with grooves or arcuate grooves are placed between the head and tail rollers and arranged in parallel, or one is a group of rollers and the other is an endless belt. It may also be a belt. In short, any device may be used as long as it can hold the cable in a state that allows it to run and transmit the rotational force of the frame 15 to the cable.

〔effect〕

By using the above-mentioned rotation prevention device of the present invention, it is possible to eliminate the rotation caused by the untwisting of the cable during bridging. , it is now possible to accurately grasp the position of point b and to reliably adjust the eccentricity of the extruded layer by the die, even in catenary type, inclined type, or horizontal type continuous vulcanizers that are affected by gravity. This makes it possible to manufacture thick-walled cables without uneven thickness, which was previously difficult.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the anti-rotation device of the present invention with a cylindrical frame cut away, and FIG. 2 is a diagram showing the location of the anti-rotation device with respect to a CCV. 10... Anti-rotation device, 11... ■Roller, 12° 13... Movable frame, 14... Interval adjustment mechanism, 1
5... Cylindrical frame, 16... Fixing member, 17...
・Support shaft, 1B...power transmission mechanism, 19...clutch, 20...drive motor, L...cable pass line 1st day

Claims (2)

[Claims] (1) Cable gripping means consisting of a pair of rollers, a pair of endless belts including caterpillars, or a combination thereof, which grips the cable so that it can run at the end seal outlet of a catenary type, inclined type or horizontal type vulcanized tube; , a frame that is rotatably fixed around the path line of the cable and rotatably supports the roller group of the gripping means or the support roller of the endless belt, and the frame is held by the gripping means and the cable is untwisted. A cable rotation prevention device for a continuous vulcanizer, which is equipped with a drive motor that rotates the same number of rotations as the rotation speed in a direction opposite to the rotation direction caused by force. (2) The cable gripping means includes a gap adjustment mechanism between gripping surfaces.
1) Cable rotation prevention device for a continuous vulcanizer as described in item 1).