JPS5841129B2 - Strip tensioning device - 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 straightening the 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 straightening the strip, and conventional devices include pinch roller, prydle, or capstan devices.

As shown in FIG. 1, the pinch roll type has first and second pinch rolls 3a in which a variable speed motor is connected between an uncoiler 1 and a winder 2.

3b and 4a, 4b are provided, and the motors are electrically controlled to provide the first and second pinch rolls 3a, 3b, :! =4a,
4b to apply a predetermined tension to the strip plate 5.

However, this method has the drawback of high costs for mechanical and electrical equipment required for control.

Further, in the prydle system, as shown in FIG. 2, first and second prydle rolls 6at6b and 7a, 7b are provided instead of the pinch rolls, and these prydle rolls 6a, 7a, 7b are provided.
7a is driven by a motor to apply tension to the strip plate 5, but this method also has the drawback of high equipment costs, similar to the pinch roll method.

Furthermore, as shown in FIG. 3, the capstan system uses first and second capstans 8, 9 instead of pinch rolls.
, and these capstans 8.9 are driven by a motor to apply tension to the strip 5, but this method also has the disadvantage of requiring high equipment costs.

Furthermore, in all of these conventional methods, the inlet and outlet sides of the strip plate 5 are mechanically completely separated and each is moved by an independent drive device, so the inlet and outlet sides cannot be synchronized. In addition, if the moving speed and tension of the strip 5 are high, a large capacity motor is required.

For this reason, the applicant has developed a tension applying roll that mechanically connects the input side pinch rolls, etc. and the output side pinch rolls, etc. so that they can always rotate at the same speed or the same speed ratio, and is also movable. A tensioning device for applying tension to a strip using rolls was previously presented.

This device has excellent advantages such as a simple structure, low equipment cost, low power cost, and no malfunction.

. However, with this device, the tension applied to the strip causes plastic and elastic stretching, which changes the length of the strip between the person, the pinch rolls on the exit side, and the like.

For this reason, an accumulator or the like is required to absorb the change in length, but since this accumulator has a limited amount of storage, it is difficult to process the strip continuously for a long time.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent stretching of the strip by connecting pinch rolls, etc. on the input side and pinch rolls, etc. on the output side to a constant torque generator. The object of the present invention is to provide a belt tensioning device that can absorb the relative rotation of a person, a pinch roll, etc. on the output side.

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

FIG. 4A shows a pridle type tensioning device.

This tension applying device consists of an uncoiler 11 and a winder 1.
2, the first prydle rolls 13, 14, which are the first strip guide members, the idle roll 15, and the second prydle rolls 16, 17, which are the second strip guide members.
and furthermore, the priddle rolls 14 and 16 are arranged in the fourth
As shown in the figure, it is connected to a constant torque generating device A via gears 43, 44 and intermediate gears 45, 46 attached to these shirts (41, 42).

This constant torque generating device A is composed of a DC motor 18, gears 14', 16', and a shaft 20, for example, as shown in FIG.

The rotor portion 19 of this DC motor is connected to a shaft 20, and this shaft 20 is connected to a gear 14' via a key 21.
is attached to the first priddle roll 14.
is connected to.

Further, the stator portion 22 of this DC motor is attached to a gear 16' via a flange, and is connected to the second bride roll 16.

This gear 16' is rotatably mounted on the shaft 20 via a bearing 23.

Therefore, the first and second priddle rolls 14 in Fig. 4A
16, rotational forces in mutually opposite directions are applied by the operation of the constant torque generating device A, and act so that the rotational torque becomes constant.

Note that 24 in FIG. 5 is a casing that holds the constant torque generating device A.

Note that the constant torque generating device A is not limited to a DC motor, and may be any device that generates a constant torque, such as a hydraulic motor.

Further, the idle roll 15 is not limited to a fixed one, but may be movable and can be applied with tension.

In this tensioning device, when the uncoiler 11, the winder 12, and the constant torque generator A are driven, the strip plate 25 unwound from the uncoiler 11 is moved to the first priddle rolls 13, 14, the idle roll 15, and the second After passing through the priddle rolls 16° 17, it is wound into the winder 12.

Here, the constant torque generator A applies a rotational force to the first prydle roll 14 in the direction of the dotted arrow, and to the second prydle roll 16 in the opposite direction. A constant tension is applied to the strip between the two priddle rolls 14 and 16.

For this reason, even when the strip plate 25 is plastically deformed, the rotational speed specific force changes dynamically, causing the deformation of the strip plate 25 to be
．． It can be absorbed by 16 relative rotations.

FIGS. 6 and 7 show a capsun type tensioning device showing another embodiment of the present invention.

This device has a pair of DC motors 18, 18 arranged above and below, and these DC motors 1B, 1B are equipped with a gear 1 shown in FIG.
4' and 16', a roll-shaped first strip guide member 31 and a second strip guide member 32 are directly attached.

Further, this device is provided with an idle roll 15, as well as a heating device 33, a cooling device 34, and a drying device 35.

The strip 25 unwound from the uncoiler 11 passes through the first strip guide member 3L31, enters the heating device 33 and the cooling device 34, passes through the idle roll 15 and the drying device 35, and is wound into the winder 12. It will be done.

In this tension applying device as well, the constant torque generating device can absorb the elongation of the strip plate 25 and can always apply a desired tension to the strip plate.

This device is particularly suitable for correcting the shape of narrow steel strips and wire rods.

In the above embodiments, tension applying devices are shown that are applied to a prydle type and a capstan type, but they can also be applied to, for example, a pinch roll type.

Furthermore, in the above embodiments, a tensioning device that straightens the strip by simply applying a tensile force, or a tensioning device that straightens the strip by applying tension and heating at the same time is shown. It can also be applied to a device that straightens a band plate by performing both at the same time.

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

Further, contrary to the embodiment, the second strip guide member may be connected to the rotor portion, and the first strip guide member may be connected to the stator portion.

As described above, according to the present invention, since the first and second strip guide members are connected to the constant torque generating device, even if the strip plate stretches due to the application of tension, this can be absorbed by the constant torque generating device. , it is possible to always apply tension to the strip with constant torque.

Further, since the idle roll does not need to have a function of applying tension, the idle roll can be fixed or the amount of movement can be reduced.

Therefore, remarkable effects such as ease of continuous processing of the strip for a long period of time are produced.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams of different conventional tensioning devices, respectively, and FIG. 4A and FIG. 6 is a sectional view of a constant torque generating device used in the same device, FIG. 6 is a front view of a capstan type tensioning device showing another embodiment of the present invention, and FIG. 7 is a front view of the main parts of the same device. be. 11... Uncoiler - 112... Winder 13.14... First priddle roll, 15... Idle roll, 16, 17...
...Second priddle roll, 18...DC motor, A...constant torque generator, 19...
...Rotor part, 20...Shaft, 21...
...Key, 22...Stator part, 23...
...Bearing, 24 ...Casing, 2
5...Strip plate.

Claims (1)

[Scope of Claims] 1. A first strip guide member in the form of a roll or drum, an idle roll, and a second strip guide member in the shape of a roll or drum are disposed between the uncoiler and the winder of the strip. members are disposed in this order, and one of the rotor section and the stator section of the constant torque generating device is arranged in the first strip guide member, and the rotor section or the stator section of the constant torque generating device is arranged in the second strip guide member. The other stator portions are rotatably connected to each other, and the first and second strip guide members are interlocked by the constant torque generating device, and the gap between the first and second strip guide members and the idle roll is A strip tensioning device that applies tension to a strip that is stretched. 2. The tensioning device for a strip according to claim 1, wherein the first strip guide member is a pinch roll, a priddle roll, or a capstan. 3. The tensioning device for a strip according to claim 1, wherein the second strip guide member is a pinch roll, a priddle roll, or a capstan. 4. The belt tensioning device according to claim 1, wherein the constant torque generating device is an electric motor or a hydraulic motor. 5. The tension applying device for a band plate according to claim 1, wherein the idle roll is provided to be movable and capable of applying a constant tension, or is fixed.