JPH10152265A - Tape tension adjustment mechanism of tape winding device - Google Patents

Abstract

(57) [Problem] To provide a tension adjusting mechanism of a tape winding device capable of keeping a tape tension constant when winding a tape. A pad 18 is rotatably supported by a pad holder 18a. At an end of the pad holder 18a, a tension adjusting mechanism 19 is integrally provided. The tension adjusting mechanism 19, which is a tension adjusting mechanism, has a configuration including a brake wheel 19a and a brake band 19b.
The material of the brake band 19b is nylon. One end of the brake band 19b is a fixing part 5 that can adjust the band tension.
2 and the other end is joined to the fixing part 53. These fixing parts 52 and 53 are mounted on the mounting board 51. The center of the brake band 19 is in sliding contact with the brake wheel 19a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape tension adjusting mechanism of a tape winding device for applying a constant tension to a tape when winding the tape around a power cable or the like.

[0002]

2. Description of the Related Art Conventionally, in forming an insulator of an oil-immersed paper power cable, a cable core is fed through a rotating head of a paper winding machine while feeding the cable core from a feeding device, and an insulating paper is formed on a peripheral surface of the cable core. Wrap it around. After the insulator is formed in this way, the cable core is wound up by a winding device.

[0003] As shown in FIG. 8, the paper winding head includes a pad 101 and a tension adjusting mechanism 103.
The pad 101 is formed by winding an oil-immersed insulating paper 102 in a roll shape, and is rotatably mounted and fixed to a pad holder. The tension adjusting mechanism 103 includes a brake wheel 103a that is integrally joined to the pad holder 101 and rotates together with the brake wheel 103, and a brake band 103 that is in sliding contact with the outer periphery of the brake wheel. Brake band 103
As for b, both ends are fixed and the center part is in sliding contact with the outer periphery of the brake wheel to give resistance to the rotation of the brake wheel 103a. In this manner, the tension adjusting mechanism 103
Back tension is applied to the insulating paper 102 unwound from the substrate.

[0004]

When insulating paper is wound around a power cable using this paper winding machine, as shown in FIG. 9, when starting up and stopping the paper winding machine, the outer diameter of the cable around which the insulating paper is wound is shown. Will fluctuate. This is because when the paper winding machine is started up or stopped, the rotation speed of the brake wheel increases from the stopped state or decreases to the stopped state, and the coefficient of static friction and the coefficient of kinetic friction at the sliding contact portion between the brake wheel 103a and the brake band 103b. This is because the friction coefficient fluctuates from the dynamic friction coefficient to the static friction coefficient, so that the back tension applied to the insulating paper fluctuates, and the cable cannot be wound around the cable with a constant tension. As described above, in the conventional tension adjusting mechanism, when the rotation of the brake wheel is stable at a constant rotation speed, the friction coefficient is constant, so that the tension of the insulating paper is constant, but the winding start and end of the winding are performed. In this case, there is a problem that the outer diameter of the cable after the insulating paper is wound fluctuates.

In general, as the rotational speed increases, the frictional resistance tends to decrease. As shown in FIG. 9, as the rotational speed increases, the cable outer diameter tends to increase. Therefore, even if the brake wheel rotates, if the rotation speed fluctuates, the cable outer diameter fluctuates.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a tension adjusting mechanism of a tape winding device capable of keeping a constant tape tension when winding a tape.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a tape tension adjusting mechanism for a tape winding device for applying a predetermined tension by applying a back tension to a tape when the tape is wound. A brake wheel that rotates and a brake band that slides on the outer periphery of the brake wheel to provide frictional resistance are provided, and the brake band is made of a material having a coefficient of static friction substantially equal to a coefficient of dynamic friction. In particular, the material is desirably nylon.

According to the present invention, since the coefficient of static friction and the coefficient of dynamic friction of the brake band are substantially equal to each other, when the insulating tape winding machine starts or stops, the number of rotations increases from the stopped state or decreases to the stopped state. Thus, even if the friction coefficient between the brake wheel and the brake band fluctuates between the static friction coefficient and the dynamic friction coefficient, the tape tension varies only slightly, and a constant cable outer diameter can be maintained.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 7 are explanatory diagrams of an insulating tape winding device for a power cable provided with a tension adjusting mechanism according to the present invention. FIG. 1 is an overall side view of the device,
2 is a side view of the winding head machine 20, FIG. 3 is an explanatory view of winding the insulating tape 10, and FIG.
0 is an explanatory diagram of winding, FIG. 5 is an explanatory diagram of tape tension by a tension adjusting mechanism, FIG. 6 is a characteristic diagram of a material of a brake band,
FIG. 7 is an explanatory cross-sectional view of the connecting portion 12.

This wrapping device is a device for connecting an OF cable having an insulator formed of an oil-immersed insulating tape at a factory before shipment (FJ), and uses an oil-immersed insulating tape 10 having a paper layer. This is a device for manufacturing a multilayer connection portion insulator 14 by winding the connection portion around the power cable connection portion 12.

The winding device includes a connecting portion holding machine (corresponding to a connecting portion holding portion) 16 for holding the connecting portion 12 at a fixed position, and a portion around the connecting portion 12 while unwinding the insulating tape 10 from the pad 18. A winding head machine (corresponding to a tape winding means) 20 for causing the pad 18 to perform a planetary motion to wind the insulating tape 10 around the connection portion 12;
A drive mechanism 22 for causing the winding head machine 20 to advance (forward / backward) along the longitudinal direction of the connection portion; and an outer peripheral surface of the connection portion 12 by controlling the operation of the drive mechanism 22 and the winding head machine 20. A separate winding operation controller 2 for continuously winding the insulating tape 10 in the longitudinal direction.
4 is provided.

As shown in FIG. 1, the winding device comprises:
A plurality of connecting part holders 16 are arranged and installed on a horizontally installed base 26 at intervals in the longitudinal direction, and the connecting part holders 16 support the weight of the power cable connection part 12 so that the power cable is supported. The connection section 12 is placed and held on a gantry 26. Although not shown, the power cables before and after the power cable connection portion 12 cannot be wound and unwound.

(Connection Holder 16) As shown in FIG.
The connection part holder 16 moves the mounting plate 16a up and down by a cylinder, and the cylinder adjusts the upper limit position of the mounting plate 16a at the ascending operation end so that the vertical position of the power cable connection part 12 is adjusted. Keep it constant. Also,
The cylinder moves downward so as not to disturb the winding head machine 20 when the winding head machine 20 moves near.

(Winding Head Machine 20) The winding head machine 20 is connected to the power cable connecting portion 1 held as described above.
2, the insulating tape 10 is wrapped around the power cable connection portion 12 when moving in the forward direction, that is, traveling in one direction. is there.

The winding head machine 20 has a substantially rectangular metal frame 20a, and a winding mechanism for the insulating tape 10 is provided on the rear side of the metal frame 20a. As shown in FIG. 3, the winding head machine 20 includes an insulating tape 1
The pad 18 in a state where the power cable connection portion 12
Are provided on the diagonal line at equal angles. One set is the pads 18s ₁ and 18s ₂ for S winding, and the other set is the pads 18z ₁ and 18z ₂ for Z winding.

As shown in FIG. 2, the pad 18 is rotatably supported by a pad holder 18a. At an end of the pad holder 18a, a tension adjusting mechanism 19 having a brake function is integrally provided. This tension adjusting mechanism 1
Reference numeral 9 denotes a configuration including a brake wheel 19a and a brake band 19b as shown in FIG. The brake wheel 19a has a groove formed on the outer peripheral surface thereof for hanging the brake band 19b. The material of the brake band 19b is nylon. One end of the brake band 19b is joined to an adjustment fixing part 52 capable of adjusting the band tension with screws, the other end is joined to a fixing part, and one end of this fixing part is fixed to the arm 55. The fixing part is attached to the attachment substrate. The center of the brake band 19b is in sliding contact with the brake wheel 19a. The dancer roll 30 is attached to one end of an arm 55 that is rotatably supported on a rotation shaft 54 at the center, and the tension of the dancer roll 30 is adjusted by a spring 38 locked at the other end of the arm 55 so that the dancer roll 30 is It is configured so that there is no looseness.

As shown in FIG. 2, the pad holder 18a
Is fixed to the rotating disk 28 via the pad bracket 18b. As shown in detail in FIG. 3, a dancer roll 30 is swingably attached to the pad blanket 18b, and the insulating tape 1 is inserted through the dancer roll 30.
0 is unwound toward the intended power cable connection section 12.

The rotating disk 28 has a substantially (C) -shaped annular portion, a part of which (in the original position, a lower portion as shown in FIGS. 2 and 3) is cut out to allow the power cable connection portion 12 to pass therethrough. And a roller 28a that is in rolling contact with the outer peripheral surface of a guide portion 20b that projects cylindrically from the frame 20a of the winding head machine 20 is fixed, and the roller 28a allows the disk 28 to rotate on the frame 20a. Provided. On the frame 20a side of the rotary disk 28, an annular gear 32 having substantially the same diameter is fixedly provided on the disk 28, and as shown in FIG. Is provided, and the annular gear 3
The rotating disk 28 rotates when the gear 2 meshes with the gear and rotates. The rotating disk 2
A cover 20d is provided so as to cover the pads 8 and the pads 18, and the cover 20d prevents the insulating oil sprinkled from the pads 18 from being scattered when the insulating tape 10 is wound.

As shown in FIG. 2, a linear guide 36a for reciprocating the winding head machine 20 on the gantry 26 is provided below the winding head machine 20, and the linear guide 36a is It is slidably engaged with a linear guide rail 36b fixed to the upper surface of the gantry 26. Drive mechanism 22 of winding head machine 20
Drives a gear from a sprocket by a chain or a belt with a servomotor, and this gear meshes with a rack gear 22e fixed to a base parallel to the linear guide rail 36b, so that the winding head machine 20 advances. ing.

At the center of the winding head machine 20,
A head roller that is rotatable while supporting the power cable connection unit 12 is provided to be vertically movable. The head roller is driven up and down by an actuator such as a cylinder in accordance with the thickness of the connecting portion insulator 14 being increased by winding the insulating tape 10.

As shown in FIG. 3, the insulating tape 10 is sent out from a set of S winding pads 18s1 and 18s2 and a set of Z winding pads 18z1 and 18z2 via respective dancer rolls 30. As described above, each pad 18 is provided with an appropriate rotation resistance and the dancer roll 30 is configured such that the tension is adjusted by a spring 38 so that the insulating tape 10 does not loosen. ing.

The insulating tape 10 is a PPLP (polypropylene laminated paper) in which a central layer is a sheet made of polypropylene and both side layers are paper layers.

Although not shown in detail, the winding operation controller 24 composed of a sequence controller or a programmable controller controls the winding of the insulating tape 10 of the winding head unit 20 and the control of the drive mechanism 22.

Next, the operation of the insulating tape winding device according to the embodiment will be described. First, the power cable connection part 12 is placed on the connection part holding machine 16 on the gantry 26 and held in a horizontal position. The power cable connection 12 is stabilized at a fixed position by its own weight. Then, as shown in FIG. 1 and FIG.
Is set to the winding head machine 20. At the end of the power cable connected at the connection portion 12 side, the insulator of the power cable is wound up.

The insulating tape 10 is exposed from the pad 18 of the winding head machine 20 through the dancer roll 30. Then, a process of overlapping the lead of the insulating tape 10 with the insulator at the end of the power cable connection side is performed. afterwards,
The winding operation controller 24 rotates the rotating disk 28 and advances (forwards) the winding head unit 20. As a result, the insulating tape 10 is unwound from the pad 18 and the pad 18 is moved around the power cable connection portion 12 in a planetary motion so that the insulating tape 10 is wound around the power cable connection portion 12 while the winding head device 20 is connected to the power cable connection portion 12. By advancing along the longitudinal direction of the cable connecting portion 12, the insulating tape 10 is continuously wound around the outer peripheral surface of the power cable connecting portion 12 in the longitudinal direction.
Insulating oil is appropriately immersed in the insulating tape 10 at the time of winding, and supplied as needed.

When winding the insulating tape, the insulating tape always has a constant tension so that
It is necessary to keep the outer diameter of the power cable from changing.
The tension adjusting mechanism 19 has a function of applying a back tension to the rotating pad 18 to apply a constant tension to the insulating tape.

The operation of the tension adjusting mechanism will be described. FIG. 5 is an explanatory diagram showing the tension of the insulating tape by the tension adjusting mechanism. The tension of the insulating tape 10 is P, the tension of the brake band 19b is T1, the biasing force of the spring is T, the outer diameter of the brake foil is D, the roll diameter of the insulating tape is Da, the pad outer diameter is D1, the pad body diameter is D2, The length from the end of the arm 55 to which the spring is locked to the rotating shaft 54 is R, the length from the end of the arm 55 to which the dancer roll 30 is attached to the rotating shaft 54 is R1, and the brake band 1
The length from the part of the arm to which 9b is fixed to the rotating shaft 54 is R2, the contact angle of the brake band 19b with the brake 19a is θ, and the insulating tape 10 extending from the pad 18 contacts the arm 55 at the contact point with the dancer roll 30. The angle formed by the perpendicular is θ ₃ , and the insulating tape 10 is
The angle formed by the perpendicular to the arm 55 at the separation point from the arm 55 is θ ₁ , and the angle formed by the brake band 19 b to the perpendicular to the arm 55 is θ ₄ .

The following equation is established from the rotational moment of the pad 18 and the brake wheel 19a. T1 = P · Da / D (e ^μθ −1) (1) From the rotational moment of the arm 55, the following equation is established. T · cos θ ₅ · R = P · (cos θ ₁ + cos θ ₃ ) · R1 + T1 · cos θ ₄ · R2 (2)

Therefore, from the equations (1) and (2), if the desired insulating tape tension is known, the tension T1 of the brake band 19b and the urging force T by the spring 38 at that time can be obtained. As can be seen from the equation (1), the insulating tape 1
According to the roll diameter Da of 0, the tension T1 tension of the brake band 19b fluctuates to obtain a constant tape tension P.
Accordingly, it is necessary to adjust the biasing force T by the spring. Thus, as the pad 18 unwinds the insulating tape 10 and the outer diameter of the tape roll changes, it is necessary to adjust the screws of the adjusting and fixing portions 52 and 53 so that a constant tension can be obtained. However, since such work is complicated, an appropriate roll outer diameter is selected, and the brake band tension T1 and the spring urging force T at that time are set.

If the friction coefficient μ is small, (e) in the equation (1)
^μθ- 1) is a small value. If T1 is set to an appropriate value, the tape tension P becomes as follows from the equation (1). P = T1 · D · ( ^eμθ− 1) / Da (3) Even if the tape outer diameter Da fluctuates from D1 to D2, ( ^eμθ- 1) becomes a small value if the friction coefficient μ is small. Thus, the fluctuation width of the tape tension P becomes smaller. Therefore, as the rotational speed increases and the friction coefficient decreases, the fluctuation of the tape tension decreases accordingly.

When the insulating tape wrapping machine is started or stopped, the number of revolutions increases from the stopped state or decreases to the stopped state, so that the friction coefficient between the brake wheel 19a and the brake band 19b becomes smaller than the static friction coefficient and the dynamic friction coefficient. Fluctuate between However, as shown in FIG. 10, nylon has almost the same dynamic friction coefficient and static friction coefficient, so that the frictional resistance hardly fluctuates during starting and stopping, and the tension of the insulating tape can be kept constant. Among the materials shown in FIG. 10, the acetal resin has a dynamic friction coefficient and a static friction coefficient that are almost the same, but since the friction coefficient is larger than nylon,
Nylon is the best because the fluctuation of the tape tension due to the rotation fluctuation becomes larger than that of nylon.

When the winding of one layer of the insulating tape 10 is completed as described above, a process of overlapping the end of the insulating tape 10 with the power cable insulator without any step is performed. Then, the winding head machine 20 is returned to the base point (returned) while the insulating tape 10 is not unwound, and the next layer of the insulating tape 10 is wound. After the insulating tape 10 is unwound from the S winding pads 18s and 18s2 as described above and S winding is performed on a predetermined layer (for example, 16 layers), the insulating tape 10 is then removed from the Z winding pads 18z1 and 18z2. The layer is unwound to perform a predetermined layer (16 layers) Z winding.

Accordingly, the insulating tape 10 including the oil-impregnated paper layer can be automatically and precisely wound around the appropriate connection portion 12 of the power cable fixed at a fixed position. That is, FIG. 11 shows the connection portion insulator 1 as described above.
4 shows the power cable connection part 12 formed.
As shown in FIG. 11, at the connection end of the power cable 40, the conductors 42 are connected to each other in a state where the cable insulator 41 made of the insulating tape is appropriately removed (the cable semiconductive layer 40a and the external semiconductive layer 40b are also removed). Are connected by a connecting pipe 44 or by welding, and the peripheral surface thereof is connected to the semiconductive layer 4 inside the connecting portion.
6, the winding device applies the insulating tape 1 on the outer peripheral surface of the connecting portion inner semiconductive layer 46 and the insulator 41.
0 is wound as described above to manufacture the insulator 14. The power cable connection part 12 after manufacturing the insulator
Then, an external semiconductive layer or a coating layer is manufactured on another line or the like.

In the above embodiment, the insulating tape 10
Is wound at the power cable connecting portion 12, but it is apparent that the same can be applied to the winding of the insulating tape 10 of the insulator of the power cable.

[0035]

As described above, according to the present invention, since the brake band is made of a material having substantially the same static friction coefficient and dynamic friction coefficient, the frictional resistance hardly fluctuates during starting and stopping, and the tension of the insulating tape is reduced. Can be kept constant. In particular, nylon has a small friction coefficient μ itself, so that even if there is a change in the rotational speed or a change in the pad outer diameter, the change in the tension is small and the tape tension can be kept substantially constant.

[Brief description of the drawings]

FIG. 1 is an overall side view of a power cable insulating tape winding device according to an embodiment of the present invention.

FIG. 2 is a side view of the winding head machine.

FIG. 3 is an explanatory diagram illustrating winding of an insulating tape.

FIG. 4 is an explanatory diagram of winding of an insulating tape as viewed from a side of the insulating tape winding device.

FIG. 5 is an explanatory diagram showing tension of an insulating tape by a tension adjusting mechanism.

FIG. 6 is a characteristic diagram of a friction coefficient of each material.

FIG. 7 is an explanatory cross-sectional view of a power cable connecting portion after an insulator is manufactured.

FIG. 8 is a perspective view showing a tension adjusting mechanism of the paper winding head.

FIG. 9 is an explanatory diagram showing an outer diameter of a cable around which an insulating tape is wound.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulation tape 18 Pad 18a Pad holder 19 Tension adjustment mechanism 19a Brake wheel 19b Brake band 20 Winding head machine

Claims (2)

[Claims] In a tape tension adjusting mechanism of a tape winding device for applying a predetermined tension by applying a back tension to a tape when winding the tape, a brake wheel that rotates together with a pad on which the tape is wound; A tape tension adjusting mechanism for a tape winding device, comprising: a brake band that slides on an outer periphery to generate frictional resistance, wherein the brake band is made of a material having substantially the same static friction coefficient and dynamic friction coefficient. 2. A tape tension adjusting mechanism for a tape winding device according to claim 1, wherein said material is nylon.