JPS6351763B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tensioning device for a strip used when continuously heat treating or correcting the shape of a strip. Note that the band plate referred to in the present invention includes not only a so-called band plate but also a wire rod and a strip material.

Tensioning devices are used when continuously heat treating or correcting the shape of the strip, and examples of this type of device include pinch roll, bridle or capstan devices.

The conventional pinch roll type has first and second pinch rolls 3a, 3b and 4a, 4b connected to variable speed motors between an uncoiler 1 and a winder 2, as shown in FIG. The first and second pinch rolls 3a,
A predetermined tension is applied to the strip plate 5 between 3b and 4a, 4b.

Furthermore, in the conventional bridle system, as shown in FIG. 2, first and second bridle rolls 6a, 6b and 7a, 7b are provided instead of the pinch rolls, and the bridle rolls 6a, 7a are driven by a motor to form a strip. 5 to add tension.

Also, in the conventional capstan type, the first and second rollers are used instead of the pinch rolls as shown in Figure 3.
Capstans 8 and 9 are provided, and capstans 8 and 9 are installed.
is driven by a motor to apply tension to the strip plate 5.

However, all of the above-mentioned conventional systems drive a motor to apply tension, and have the disadvantage of requiring equipment costs for mechanical and electrical equipment to control this. Moreover, in the conventional type, the input side and the output side of the strip plate 5 are completely separated mechanically, and each is moved by an independent drive device. Therefore, a high degree of skill is required to synchronize the input side and the output side, and if the moving speed or tension of the strip 5 is high, a large-capacity motor is required.

In view of this, the present inventor has developed a system that mechanically connects the input side pinch rolls, etc. and the output side pinch rolls, etc. so that they always operate at the same speed or the same speed ratio, and is movable. We previously proposed a device that applies tension by pulling the strip using a tensioning roll.

This tension applying device has excellent advantages such as a simple device structure, low equipment costs, low power costs, and no malfunctions.

However, when tension is applied to the strip using this tensioning device, plastic elongation and elastic elongation occur in the strip, and the strip between input and output side pinch rolls becomes longer. For this reason, an accumulator or the like is installed to absorb this change in length, but this accumulator has a limited amount of storage and it is difficult to process the strip continuously for a long time. This tendency is particularly noticeable when applying high tension.

The present invention was made in view of the above circumstances, and
The purpose of this is to absorb the elongation of the strip by increasing the circumferential speed of the pinch rolls on the outlet side compared to the pinch rolls on the input side, so that the strip can be processed continuously for a long time. The purpose is to obtain a plate tensioning device.

The present invention will be described below based on illustrated embodiments.

FIG. 4 shows a bridle type tension applying device. This tension applying device includes entry side bridle rolls 13 ₁ to 13 ₄ which are first strip guide members between the uncoiler 11 and the winder 12;
An idle roll 14 and exit side bridle rolls 15 ₁ to 15 ₄ which are second strip guide members are arranged,
A band plate 16 is stretched between these. Further, a strip cutting machine 17 and a strip welding machine 18 are arranged between the uncoiler 11 and the winder 12. Also, the idle roll 14 and the exit bridle roll 15
A strip heating device 19 and a cooling device 2 are installed between ₁ to 15 ₄ .
0 and exit side bridle roll 15 ₁ ~ 1
5 Pinch roll 21 between ₄ and winder 12
are placed.

Furthermore, the entrance bridle roll 13 ₁ and the exit bridle roll 15 ₁ , the entrance bridle roll 13 ₂ and the exit bridle roll 15 ₂ , the entrance bridle roll 13 ₃ and the exit bridle roll 15 ₃ , and the entrance bridle roll 13 ₄ and the exit bridle roll 15 ₄ are independently connected and interlocked by mechanical means 22 ₁ to 22 ₄ such as chains and gears. In this case, the circumferential speed of the outgoing bridle rolls 15 ₁ to 15 ₄ is made faster than the circumferential speed of the incoming bridle rolls 13 ₁ to 13 ₄ at a fixed ratio, so that the elongation of the strip 16 is absorbed here. ing. A specific means for increasing the circumferential speed at a constant rate is to make the diameters of the exit bridle rolls 15 ₁ to 15 ₄ larger than the diameters of the input bridle rolls 13 ₁ to 13 ₄ at a constant rate. Another method is to adjust mechanical means 22 ₁ to 22 ₄ such as chains and gears so that the rotational speed of the exit bridle rolls 15 ₁ to 15 ₄ is more constant than that of the entry bridle rolls 13 ₁ to 13 ₄ . There is a way to increase the ratio.
For example, 100Kg/mm ² to 130 to the strip plate 16 of spring material, etc.
When applying a tension of Kg/mm ² , the entrance bridle rolls 13 ₁ to 13 ₄ and the exit bridle rolls 15 ₁ to 1
It is preferable that the difference in diameter or rotational speed from 5 to ₄ is 1.2 to 1.6%.

Further, the idle roll 14 may be of a fixed type or may be of a movable type so as to be adjustable.

The heating device 19 heats the strip plate 16 in order to correct the shape of the strip plate 16, and includes, for example, a direct current heating device shown in FIG. 5, a high frequency induction heating device shown in FIG. 6, and the like. The direct current heating device is the first
A pair of first electrode rollers 24, 24 are mounted on the stand 23.
A pair of second electrode rollers 26, 26 are arranged on the second stand 25, and these first electrode rollers 24, 24 and second electrode rollers 26, 26 clamp and press the strip plate 16. The band plate 16 is heated by the resistance heat generated by applying electricity to the band plate 16.

Furthermore, the high-frequency induction heating device has a plurality of sets of upper inductors 27 and lower inductors 28 arranged in a row, and a coil 29 is wound around the upper inductors 27 and lower inductors 28 so that north poles and south poles alternately occur along the length of the inductors. A high frequency current is passed through this coil 29 to induct the inductors 27 and 2.
The strip plate 16 passing through the space 8 is rapidly heated by high frequency induction heating.

In this tensioning device, when the uncoiler 11 and the winder 12 are driven, the uncoiler 11
The strip 16 unwound from the bridle rolls 13 ₁ to 13 ₄ on the inlet side, the idle roll 14, the strip heating device 19, the cooling device 20, and the bridle rolls 15 ₁ to 15 ₄ on the outlet side, is wound up in the winder 12. It will be done. Here, the inlet bridle rolls 13 ₁ to 13 ₄ and the outlet bridle rolls 15 ₁ to 15 ₄ are connected and interlocked by mechanical means 22 ₁ to 22 ₄ such as chains and gears. For this reason, the entry side bridle roll 13 ₁
13 ₄ and the exit bridle rolls 15 ₁ to 15 ₄ are mutually restricted in their rotation and their torques cancel each other out. As a result, tension can be applied to the strip 16 even without a drive motor. Furthermore, since the circumferential speed of the exit bridle rolls 15 ₁ to 15 ₄ is higher than that of the entry bridle rolls 13 ₁ to 13 ₄ , even if plastic elongation or elastic elongation occurs in the strip 16 due to tension, the exit bridle This can be absorbed by the rolls 15 ₁ to 15 ₄ and the tension of the strip 16 can be kept constant.

Further, according to this device, the entrance bridle rolls 13 ₁ to 13 ₄ and the exit bridle rolls 15 ₁ to 1
5 ₄ and the idle roll 14 are not driven, and the tension application is not electrically controlled, so the structure is extremely simple.

Further, according to this device, each bridle roll 1
3 ₁ to 13 ₄ and 15 ₁ to 15 ₄ are independently connected by mechanical means 22 ₁ to 22 ₄ ,
Strength load is distributed.

Next, other embodiments of the present invention will be described.

FIG. 7 shows a capstan type tensioning device. This tension applying device includes an entry side capstan 30, which is a first strip guide member, an idle roll 31,
This is a second band guide member. Exit side capstan 3
2, and a strip plate 16 is stretched between them,
An inlet capstan 30 and an outlet capstan 32 are connected by mechanical means 33 such as a chain or gear. In this case, the rotational speed of the output side capstan 32 is controlled by the mechanical means 33 to the input side capstan 30.
The outer diameter of the outlet capstan 32 is made to be larger than the outer diameter of the inlet capstan 30 by a fixed ratio. Also in this device, the elongation of the strip plate 16 can be absorbed by increasing the circumferential speed of the output side capstan 32. In particular, this device is suitable for correcting the shape of narrow strips 16 and wire rods.

Further, in the above-described embodiments, the tension applying device is shown as being applied to a bridle type and a capstan type, but it can also be applied to, for example, a pinch roll type.

Furthermore, in the embodiment, a tension applying device that straightens a strip by simultaneously tensioning and heating is shown, but it can also be applied to a device that straightens a strip by simultaneously tensioning and bending. .

Furthermore, this device can be applied not only to straightening but also to other devices, such as heat treatment devices, as long as it is necessary to apply tension to the strip.

As described above, according to the present invention, since the circumferential speeds of the first strip guide member and the second strip guide member are changed at a constant ratio, the elongation of the strip caused by the application of tension is absorbed, and the torque is always constant. tension can be applied to the strip. Therefore, even when a high tension is applied to the strip and the amount of elongation is large, the strip can be processed continuously for a long time, which is a remarkable effect.

[Brief explanation of the drawing]

1 to 3 are explanatory views of different conventional tension applying devices, and FIG. 4 is an explanatory view of a bridle type tension applying device showing an embodiment of the present invention.
5 and 6 are explanatory diagrams showing different examples of the strip heating device used in the same device, and FIG. 7 is an explanatory diagram of a capstan type tension applying device showing another embodiment of the present invention. 11... Uncoiler, 12... Winder, 13
₁ to 13 ₄ ...Enter side bridle roll, 14...Idle roll, 15 ₁ to 15 ₄ ...Outlet side bridle roll, 16...Strip plate, 17...Strip plate cutting machine, 18...Strip plate welding machine, 19...Strip plate heating Device, 20... Cooling device,
DESCRIPTION _OF SYMBOLS 21... Pinch roll, _221-224 ... Mechanical means, 23... First stand, 24... First electrode roller, 25... Second stand, 26... Second electrode roller, 27... Upper inductor, 28... Lower inductor , 29...coil.

Claims (1)

[Claims] 1. Between the uncoiler and the winder of the strip,
a roll-shaped or drum-shaped first strip guide member;
An idle roll and a second roll-shaped or drum-shaped
A strip guide member is arranged in order, and the strip is stretched between the first and second strip guide members and the idle roll, and the first strip guide member and the second strip guide member are arranged in order. are connected by mechanical means to connect the first and second
In the strip tension applying device in which the strip guide members are interlocked, the rotational speed of the second strip guide member is made larger by a fixed ratio than the rotational speed of the first strip guide member by the mechanical means, or The outer diameter of the second strip guide member is made larger than the outer diameter of the first strip guide member by a certain ratio, so that the circumferential speed of the second strip guide member is faster than the circumferential speed of the first strip guide member. A device for adding tension to a strip. 2. The strip tensioning device according to claim 1, wherein the first strip guide member and the second strip guide member are pinch rolls, bridle rolls, or capstans. 3. The tension applying device for a band plate according to claim 1, wherein the idle roll is provided so as to be movable and capable of applying a constant tension, or is fixed. 4. The strip tensioning device according to claim 1, wherein the mechanical means is a chain or a gear. 5 The first strip guide member and the second strip guide member each include a plurality of bridle rolls,
A device for applying tension to a strip according to claim 1, wherein each bridle roll of the first strip guide member is independently connected to a corresponding bridle roll of the second strip guide member by mechanical means. .