JPH0136247Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a laminated metal tape coating device that continuously coats the outer periphery of a core of an electric wire or the like with a laminated metal tape so as to wrap the core.

Generally, laminated metal tapes used for electric wires include those made by laminating a plastic film on one or both sides of a metal tape made of lead or aluminum, or those made by sandwiching a metal tape through a plastic film. This type of laminated metal tape (hereinafter referred to as "wrap tape") is generally used in water-shielding cables and the like to prevent water-shielding cables, and is generally continuously coated by lining the cable core vertically. For example, Figure 1 shows an example of a water-shielded power cable, in which a cable core consisting of a conductor S and an insulator S' is coated with wrap tape T, wire strand W, holding tape X and sheath Z in order. It's getting warmer.

Conventionally, as a device for coating the wrap tape T, a forming die having a passage hole for forming the coating has been used, but it has the following disadvantages.

(1) In the case of a large diameter and heavy core, the core often enters the die with undulations or fluctuations in outer diameter in the longitudinal direction; in such cases, the die itself is a rigid body. By this,
There is a risk that the wrap tape may be partially pressed against the core with an unnecessarily strong force, resulting in scratches or damage to the tape.

(2) In a so-called telescopic die, which is a die in which the diameter of the die exit hole can be adjusted by dividing the die exit part by providing multiple slits in the longitudinal direction of the die, the die opening hole tends to sag downward and widen due to the weight of the cable itself. If you increase the rigidity of the die to prevent wrap tape from sagging, it will reduce its elasticity and cause more resistance to be applied to the tape than necessary, causing abnormal elongation or breakage of the tape. Become. That is, it is extremely difficult to adjust the diameter of the die exit hole.

The present invention is a wrap tape coating device that solves the above-mentioned problems, and includes a plurality of string support devices having passage holes through which the core and the laminated metal tape pass through, which are arranged at intervals in the core feeding direction. a plurality of tape-forming strings disposed concentrically with respect to the center of the passage hole, and at least one of the adjacent string support devices has a string support disk, and the disk is configured to be able to rotate with respect to the center of the passage hole, and the laminated metal tape is formed by the forming string group, which has an hourglass shape with a constricted center part due to the rotation of the string supporting disk, and the outer periphery of the core is This device is characterized in that it is coated with The present invention will be explained below with reference to the drawings.

FIG. 2 is a schematic side view of the entire apparatus, in which the core M and the wrap tape T containing lead tape are fed forward. In this Fig. 2, the base plate 1 is long in the front-rear direction.
A bracket 2 is fixed to both front and rear ends of the bracket 2, and two guide rails 3 extending parallel to each other in the front and rear direction are supported between the brackets 2. The rail 3 includes, in order from the rear side, a feed roller 5, an auxiliary string support device 6, first, second, and third string support devices 7, 8,
9. A hot air supply device 10 and a press roller 11 are arranged at intervals in the front-rear direction. Each roller 5, 11 and each device 6, 7, 8, 9, 10 is fitted to the rail 3 so as to be slidable in the front and back direction by a pair of bosses 13, respectively, and is held in an appropriate position in the front and back direction by a lock bolt 15. It can be fixed. A core passage hole 16 having the same center line O is formed in each of the string support devices 6, 7, 8, and 9, and the diameter of each passage hole 16 is set to such an extent that the core M and the tape T can pass through with a margin. , which is larger than the core diameter. The auxiliary string support device 6 and the first string support device 7 are fixed in position in the front and back direction by lock bolts 15, but the second and third string support devices 8,
9 has the lock bolt 15 loosened and is set to be movable in the front and rear direction.

Between the first, second, and third string support devices 7, 8, and 9, a large number of tape forming strings A are arranged so as to surround the entire circumference of the core M in a twisted position with respect to the core center line O, and The central part (the central part of each of the front and rear axes between the devices 7, 8, and 9) is stretched so as to form a constricted drum shape. The rear end of each string A is fixed to the first string support device 7 at equal intervals in the circumferential direction so as to surround the entire circumference of the passage hole 16, as shown in FIG. Each string A (A ₁ , A ₂ , ...
A _o ) is twisted counterclockwise from the first string support device 7, for example, when viewed from the front, and reaches the second string support device 8 (FIG. 6) in front, and is connected to each string passing hole of the second string support device 8. Pass 18. For example, the string _A1 fixed to the upper end position of the first string support device 7 in FIG. 5 passes through the passage hole 18 of the second string support device 8, for example, at the left end of FIG. Each string A that has passed through the second string support device 8 is then twisted clockwise when viewed from the front and
It reaches the string support device 9 and is fixed to the third string support device 9 as shown in FIG. . For example, the string _A1 is fixed to the upper end of the third string support device 9 in FIG. In this way, each string A is formed into a drum shape as described above.

Between the auxiliary string support device 6 and the first string support device 7, for example, when covering a core M with a large diameter, a tape T is placed in a somewhat arcuate shape as a step before starting the covering with the string A. Strings B (B ₁ , B ₂ , . . . B ₈ ) for deformation are strung around. The rear end of the string B is attached to the auxiliary string support device 6, and the third
As shown in the figure, they are fixed at intervals in the circumferential direction so as to surround the half circumference of the lower half of the passage hole 16. . The left half of string B in Figure 3 B ₁ to _{B 4}
is twisted clockwise in the circumferential direction when viewed from the front and reaches the first string support device 7 in the front, and as shown in FIG. It is fixed in place. The right half of string B in Figure 3
B ₅ to _{B 8} are twisted counterclockwise when viewed from the front to reach the first string support device 7 in FIG. 4, and are fixed to the upper right half of FIG. 4 in an arcuate arrangement.

As the strings A and B, materials with a low coefficient of friction, a certain degree of elasticity, and high wear resistance are used, such as leather strings or nylon strings, and the diameter thereof is, for example, about 3 to 5 mm. be.

Next, the specific structure of each string support device 6, 7, 8, 9 will be explained. In FIG. 13 showing the third string support device 9, the third string support device 9 includes a thick support plate 20 having the boss 13, a pair of disks 21,
It consists of 22 mag. . Both disks 21,2
2 is a thick intermediate disk 2 with a smaller diameter than both disks.
3 by welding or the like, and is fitted into the top-opening semicircular recess 20a of FIG. 14 of the support plate 20 so as to be immovable in the axial direction and rotatable in the circumferential direction. A disk assembly 25 consisting of disks 21, 22, and 23 is roughly divided into upper and lower halves with a mating surface D as a boundary. The upper and lower parts of the disk assembly 25 are pivotally connected at the right end in FIG. 14 by a U-shaped hinge 26 and two pins 27, and the left end bracket parts 21a and 21b are connected by bolts 28. has been done. That is, by removing the bolts 28, the upper half of the disk assembly 25 can be opened relative to the lower half. 16 is a passage hole through which the core M and tape T pass, as described above.

As shown in FIG. 14, a large number of grooves 29 perpendicular to the core center line O are formed radially in the front disk 21 in FIG. are formed respectively. As shown in FIG. 13, the string passage hole 18 is also formed in the rear disk 22 through the intermediate disk 23. A female threaded hole 30 is formed in the outer peripheral side of each passage hole 18 in FIG. 14, and a string tightening bolt 32 is screwed into each female threaded hole 30 via a rectangular washer 31. . That is, the string A extending from the rear passes forward through each passage hole 18, is bent toward the outer circumference, is wound around the bolt 32, and is tightened by the bolt 32 between the washer 31 and the surface of the groove 29. This also allows the length of the string A to be adjusted.

Reference numeral 33 in FIG. 14 denotes a pair of adjusting bolt support arms, which are rotatably supported at the right end of the support plate 20 in FIG. 14 via a pin 34.
It can be fixed in the working position shown in FIG. 14 by means of a rotation regulating bolt 35. The arm 33 extends in a curved manner to just above the disk assembly 25, and is rotatably provided with an adjuster nut 36 at its tip via a horizontal pin portion 36a. An adjusting bolt 37 is screwed into the adjusting nut 36, and a disk holding body 38 is attached to the lower end of the bolt 37.
is connected to be rotatable relative to the bolt 37 and movable in the vertical direction together with the bolt 37. By tightening the adjustment bolt 37, the intermediate disk 23 is moved to the support plate recess 20 via the presser body 38.
a, and the disk assembly 25 can be fixed unrotatably.

That is, the third string support device 9 in FIGS. 13 and 14 is
Loosen the adjustment bolt 37 and remove the disk assembly 2.
5, the twist angle of the string A with respect to the core center line O is adjusted, and the diameter of the constricted portion of the second hourglass shape of the entire string A is adjusted in accordance with the diameter of the core M. After that adjust bolt 37
Tighten the disc assembly 25 (Fig. 14).
is fixed so that it cannot rotate.

In addition, if you wish to take out the cable during the sheathing work if the sheathing work fails, remove the arm bolt 35 (Fig. 14) and remove the arm bolt 35 (Fig. 14).
3 in the direction of arrow C, and then remove the disk assembly 2.
Remove the bolts 28 of 5 and remove the disk assembly 25.
The upper half of the can be opened and the cable can be taken out upwards.

The second string support device 8 shown in FIG. 2 has exactly the same structure as the third string support device 9 described above. However, the string A simply passes through the string passage hole 18 (FIG. 14) and is not fixed by the string tightening bolt 32 or the like.

The first string support device 7 has a similar structure to the third string support device 9, but is constructed so that the disk 21 having the groove 29 shown in FIG. 14 is located on the rear side of FIG. Further, on the disk 21 on the rear side of the first string support device 7, as shown in FIG.
A plurality of strings B (B ₁ , B ₂ , . . . B ₈ ) are tied to the tip of each terminal 38 . Base end flange 38a of each terminal 38 (Fig. 16)
is fitted into the guide groove 40a of the guide body 40 so as to be movable in the circumferential direction of FIG. 15 and fixed at any circumferential position. For example, each terminal 38 is formed with a male thread, and a nut 42 is screwed into it.
The terminal 38 can be fixed by tightening the guide body 40 between the nut 42 and the collar portion 38a. Note that the guide body 40 is the disk 2
1, and the core centerline O
It is formed in a partially arcuate shape with its center at , and naturally has a partially arcuate elongated hole 40b for allowing the terminal 38 to protrude rearward (FIG. 16). . The guide body 40 is fixed, for example, to the disk 21 with bolts or the like. .

In the first string support device 7 shown in FIG.
By moving the position 8 upward, it is possible to make the twist angle of the string B corresponding to the core M having a small diameter (a large twist angle), and conversely by shifting the position of the terminal 38 downward. , the twist angle of the string B can be changed to correspond to the core M having a successively larger diameter.

The auxiliary string support device 6 in FIG.
It has the same structure as the string support device 9, but the groove 29
A disk 21 having a screw hole 30 is fixed to the rear side in FIG. However, as explained in FIG. 3, the string B is fixed in an upwardly opening semicircular arrangement so as to correspond only to the lower half of the core passage hole 16.

In addition, as for the auxiliary string support device 6, the passage hole 16 may be formed in a semicircular shape that opens upward, as shown by the imaginary line in FIG.

Next, the coating operation will be briefly explained with reference to FIG. 2 and FIGS. 8 to 12. Figures 8 to 12 are the second
Each cross-sectional shape of the tape T is shown at the cross-sectional plane -XII-XII in the figure. Also, as mentioned above, the second
The third string support devices 8 and 9 are movable in the rail length direction, and the first string support device 7 and the auxiliary string support device 6 are locked so as not to be movable in the rail length direction.

The wrap tape T is adhered to the lower end of the core M at the feed roller 5 portion, and is sent forward together with the core M. While passing through the string B part, as shown in FIGS. 9 and 10, it is formed into an arcuate shape to cover approximately 2/3 of the core M. Next, while passing through the approximately central portion between the first and second string support devices 7 and 8, the string A
As shown in FIG. 11, the tape T is formed so as to cover the entire circumference of the core M, and the wrap tape T is further formed by the string A in the central part between the second and third string support devices 8 and 9. As shown in FIG. 12, the core M is reduced in diameter and brought into close contact with the core M, then heated by a hot air supply device 10, and finally pressed by a presser roller 11.
This allows the tape T to be brought into close contact with the core M completely.

Note that the diameter of the constricted part of the string A between the second and third string support devices 8 and 9 is the same as that of the first and second string support devices 7 and 8.
so that it is smaller than the diameter of the constriction between
The apparatus of FIG. 2 is set up.

In addition, when covering the core M with a small diameter with the wrap tape T, it is not necessary to provide the auxiliary string support device 6 and the string B, and the first, second, and third string support devices are directly connected to the roller 5 in FIG. Core M to 7, 8, 9
and feed the tape T.

In the present invention, since the string A may be shaped like a drum, one string support device may be configured to be rotatable. That is, in the embodiment shown in FIG. 2, only the second string support device 88 has the configuration shown in FIGS. It is also possible to have a configuration that does not provide any advantage.

As explained above, in the present invention, a plurality of string support devices 7, 8, and 9 having passage holes 16 through which the core M and wrap tape T pass are arranged at intervals in the core feeding direction, and adjacent string support devices A large number of tape-forming strings A are arranged between them, which are twisted about the core center O by the rotation of the disks 21 and 22, and the wrap tape is formed by the above-mentioned forming string group A, which is shaped like a drum with a constriction in the center. Since the T is molded to cover the outer periphery of the core, there are the following advantages.

(1) In the case of a core with a large diameter, waviness in the longitudinal direction of the core and fluctuations in the outer diameter often occur immediately after extrusion from the extruder crosshead, etc., but this invention is suitable for many tape molding applications. Since the wrap tape T is molded and covered with a string, it can cope with outer diameter fluctuations better than a molding die, etc., and the wrap tape T is not partially pressed against the core M with an unnecessarily strong force. . Therefore, even if there is a change in the outer diameter of the core, the tape T can be well coated without being damaged.

(2) Since the wrap tape T is made to cover the core M with a large number of strings A twisted about the core center line O, by changing the twist angle of the strings A, cores M of various diameters can be applied. Be able to respond. That is, it is not necessary to provide separate devices for each size of the core M, which is economical.

(3) For example, if the twist angle of the string A is adjusted using the rotatably adjustable disk 21 as shown in Fig. 14, adjusting the twist angle to correspond to the diameter of the core M can be done easily and quickly. You will be able to do it in less time and also be able to make fine adjustments accurately.

(4) For example, if the string support devices 7, 8, and 9 are made movable and fixed to the rail 3 in the core feeding direction as shown in Fig. 2, and the length of the string A is made changeable, the extruder crosshead for core production The wrap forming position (neck position of string A) in the core feeding direction from etc. can be easily changed. That is, depending on the core diameter, it is necessary to change the lap forming position due to problems such as cooling time, but even in such cases, the lap forming position can be easily changed.

In addition, in this invention, the number of string support devices may be four or more. In addition, each string support device 7, 8, 9
The twisting directions of the strings A may all be unified in the same direction. However, as shown in FIG. 2, the twisting direction of the string A between the first and second string support devices 7 and 8,
By making the twisting directions of the string A between the string support devices 8 and 9 opposite to each other, there is no fear that the tape T will twist in one direction with respect to the core M.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a commonly used electric wire, Figure 2
The figure is a schematic overall side view of a laminated metal tape longitudinal device to which the present invention is applied, Figures 3 to 7 are cross-sectional views of Figure 2, respectively, and Figures 8 to 12 are Figures 2 to 2 of the wrap tape. 13 is a side view showing an embodiment of the string support device, FIG. 14 is a view taken in the direction of arrow XI in FIG. , 1st
FIG. 6 is a partial cross-sectional view of FIG. 7, 8, 9... String support device, 16... Passing hole,
21, 22... Disk, A... String, M... Core, T... Laminated metal tape (lap tape).

Claims (1)

[Scope of utility model registration request] In a laminated metal tape coating device that continuously covers the outer periphery of a core such as an electric wire by lining a laminated metal tape vertically so as to wrap around the core, a cord support device having a passage hole through which the core and laminated metal tape pass is connected to the core feeder. A plurality of tape-forming strings are arranged at intervals in the direction, and adjacent string support devices are connected by a plurality of tape-forming strings arranged concentrically with respect to the center of the passage hole, and adjacent string support devices At least one of them has a string-supporting disk, and the disk is configured to be able to rotate about the center of the passage hole, and the rotation of the string-supporting disk forms an hourglass shape with a constricted center portion. A laminated metal tape coating device characterized in that the laminated metal tape is formed by the above-mentioned forming string group and coated on the outer periphery of the core.