JPH05255760A - Device for controlling tension in vertical type annealing furnace - Google Patents

Abstract

PURPOSE:To provide a device for controlling tension in a vertical type anneling furnace in which a material conveyed in the furnace is not damaged and the necessary sealability is obtd. and the tension of the material can accurately be detected and controlled. CONSTITUTION:In this control device a casing 2 connected to the inlet side opening part Fe of the vertical type annealing furnace F, a pair of seal rolls 7, sealing members 17, 18, a dancer roll 19 supported on a drawing device 23 and a tension detecting roll 35 supported through a tension detecting instrument 37 are arranged. In this tension control device 1, the material S is conveyed into the furnace Fi from the pair of seal rolls 7 through the dancer roll 19 and the tension detecting roll 35. Further, the tension of the material S in the furnace is adjusted by adjusting the drawing force of the dancer roll 19 based on the detected value of the tension detecting instrument 37. Further, the positional variation in the dancer roll 19 is detected by a postitional detecting instrument 34, and based on this detected value, a driving source 13 is controlled to keep the dancer roll 19 at the normal position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace tension control device for a material in a vertical annealing furnace in which a strip-shaped material such as a metal strip is continuously conveyed into the furnace and annealed.

[0002]

2. Description of the Related Art In a vertical annealing furnace in which a strip-shaped material such as a metal strip is continuously conveyed in the vertical direction and annealed, the tension of the material conveyed in the furnace, that is, the tension in the furnace must be kept constant. .. Further, in the above annealing furnace, it is necessary to seal between the material and the furnace wall at the inlet side opening to prevent leakage of the atmosphere inside the furnace or invasion of outside air into the furnace.

Therefore, conventionally, a bridle roll is provided in the material conveying process up to the annealing furnace, and while the bridle roll adjusts the in-furnace tension of the material, a felt seal mechanism or a roll seal is provided at the inlet side opening of the annealing furnace. A mechanism is provided, and these sealing mechanisms prevent leakage of the atmosphere in the furnace and invasion of outside air into the furnace.

[0004]

However, in the above-mentioned felt seal mechanism, a pair of felt seals made of asbestos or the like are arranged facing each other at the inlet side opening of the furnace so as to close the inlet side opening. It holds the material. Therefore, the felt seal mechanism has a problem in that the material may be scratched by contact with the felt seal. Further, if a gap is provided between the material and the felt seal so that scratches do not occur, the sealability will naturally deteriorate.

On the other hand, the roll seal mechanism is one in which two rolls are arranged in parallel with each other along the longitudinal direction of the inlet side opening of the furnace in pressure contact with each other, and the material is sandwiched and conveyed by these rolls. Is. However, there is a problem that the frictional resistance with the roll is large, and the in-furnace tension cannot be accurately detected and controlled.

Therefore, according to the present invention, it is possible to accurately detect and control the in-furnace tension of the material without damaging the material, and to properly secure the sealing property at the inlet opening of the annealing furnace. It is to provide a control device for the tension in the furnace.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and a furnace tension control device for a vertical annealing furnace has an inlet side opening and an outlet side connected to the annealing furnace. A casing provided with an opening, a seal roll pair disposed near the inlet opening of the casing and feeding a material into the casing through the inlet opening, and provided between the casing and the seal roll pair. A seal member, a dancer roll that is rotatably and vertically movably supported by the traction device inside the casing, and a material that has passed through the pair of seal rolls is wound, and rotatably supported inside the casing. , The tension detection roll that sends the material that has passed through the dancer roll toward the outlet side opening of the casing, and the load acting on the tension detection roll is detected to detect the tension inside the furnace Tension detecting device, a tension adjusting device that adjusts the tension in the furnace of the material by adjusting the traction force of the dancer roll based on the output of the tension detecting device, and a position detecting device that detects the position of the dancer roll. And a drive source that controls the drive of the seal roll pair based on the detection value of the position detection device, and a drive motor that controls the drive of the seal roll pair based on the detection value of the position detection device. It is a thing.

[0008]

In the tension control device having the above structure, the outlet opening of the casing is connected to the annealing furnace. As a result, the atmosphere inside the furnace is filled inside the casing. However, since the inlet side opening of the casing is sealed by the seal roll pair and the seal member, the atmosphere inside the furnace does not leak from the casing and the outside air does not enter the furnace. The casing connected to the annealing furnace is charged with the material through the inlet opening. The material to be charged is conveyed while being sandwiched between the pair of seal rolls, and is fed into the furnace from the outlet side opening through the dancer roll and the tension detection roll. The tension of the material conveyed from the casing into the furnace, that is, the tension in the furnace is detected by the tension detecting device as a load acting on the tension detecting roll. The tension adjusting device adjusts the tension of the material in the furnace by adjusting the traction force of the dancer roll based on the signal from the tension detecting device. Further, the drive of the seal roll pair is controlled based on the detection value of the dancer roll position detection device. As a result, the dancer roll is kept in a regular position, and the tension in the furnace is controlled to be constant.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings with reference to FIGS. In the above figure,
The vertical annealing furnace (hereinafter simply referred to as “furnace”) F is made of a material S such as a metal strip charged through an inlet side opening Fe at the bottom.
Is heat-treated while being continuously conveyed upward. The tension control device 1 adjusts the in-furnace tension T of the material S charged in the furnace F to a predetermined value, and also prevents leakage of the atmosphere in the furnace and invasion of outside air into the furnace.

In this tension control device 1, the casing 2 has an inlet side opening 3 on the side and an outlet side opening 4 on the upper side, and the wheels 5 and 5 on the bottom side allow the casing 2 to move in the left-right direction. It is freely movable to. Inside the casing 2, a pair of columns 6 and 6, a pair of seal rolls 7 supported by the columns 6 and 6, a dancer roll 19, and a tension detection roll 35 are housed.

The seal roll pair 7 is composed of a drive roll 8 and a nip roll 9 parallel to the drive roll 8 and is arranged in the vicinity of the inlet opening 3 of the casing 2. The drive roll 8 has a shaft 10 rotatably provided on the columns 6 and 6.
Supported by. The shaft 10 projects to the outside of the casing 2 via a seal 11 and is drivingly connected to a motor 13 via a speed reducer 12. One nip roll 9
Are the shafts 14 and 1 rotatably provided on the columns 6 and 6, respectively.
4 is swingably supported via arms 15 and 15, and is brought into contact with and separated from the drive roll 8 by rotating the shafts 14 and 14 by cylinders 16 and 16. Further, seal members 17 and 18 are arranged between the drive roll 8, the nip roll 9 and the casing 2, and the inlet side opening 3 is sealed by the seal members 17 and 18 and the seal roll pair 7. Has been done. It is preferable to use nitrogen gas for the cylinders 16 and 16 so as to correspond to the atmosphere in the furnace.

The dancer roll 19 is disposed obliquely above the pair of seal rolls 7 and engages the vertical guides 21 and 21 of the columns 6 and 6 at both ends of the shaft 20 and is supported by the pulling device 23. Has been done.

A tension adjusting device 38 is provided to adjust the traction force of the traction device 23. That is, the shaft 24 is rotatably supported by the columns 6 and 6, and the sprockets 25 and 25 are fixedly provided near the insides of the columns 6 and 6, respectively. Chains 26, 26 are wound around the outer circumferences of the sprockets 25, 25.
One end of 6 is fixed on the outer circumference of the sprockets 25, 25, and the other end is connected to support rings 22, 22 rotatably provided on both end sides of the dancer roll 19, respectively.
Further, one end of the shaft 24 projects from the casing 2 via a seal 27, and a sprocket 28 is fixed to this projecting portion. Furthermore, a synchro 34 for detecting the rotation angle of the shaft 24 is provided at the end of the shaft 24 as a position detecting device, and the detection value of the synchro 34 is output to the motor 13. A drive shaft 31 having a sprocket 32 is drivingly connected to a motor 29 via a powder clutch 30, and the two sprockets 28 and 32 are drivingly connected to each other by an endless chain 33.

The tension detecting roll 35 is disposed obliquely below the dancer roll 19, and is rotatably attached to the supporting portions 36, 36 (one of which is not shown) of the columns 6, 6 via the tension detecting portion 37. It is supported, and the detection value of the tension detecting section 37 is output to the powder clutch 30. The tension detecting unit 37 includes an elastic body and a load cell that detects the deformation of the elastic body as a change in electrical resistance. The force applied to the tension detecting roll 35 is detected using the load cell. Is becoming

In the tension control device 1 having the above structure, the outlet opening 4 of the casing 2 is connected to the inlet opening Fe of the furnace F. As a result, the inside of the casing 2 is filled with the atmosphere of the in-fur Fi. However, since the inlet opening 3 is sealed by the pair of seal rolls 7 and the seal members 17 and 18, the atmosphere does not leak and the outside air does not enter the furnace.

The drive roll 8 rotates in the direction of arrow a based on the drive of the motor 13, and conveys the material S charged from the inlet side opening 3 of the casing 2 into the casing 2. The nip roll 9 contacts the lower surface of the material S,
The nip roll 9 rotates in the direction of the arrow a ′ while being driven by the movement of the nip roll 9.

The material that has passed between the drive roll 8 and the nip roll 9 is wound around the upper outer peripheral surface of the dancer roll 19 and further around the lower outer peripheral surface of the tension detecting roll 35, and then the outlet opening 4 is formed. And is drawn into the furnace Fi through the inlet side opening Fe of the furnace F, and is continuously carried into the furnace by a material carrying device (not shown).

The adjustment of the tension T of the material conveyed in the furnace Fi (tension in the furnace) T will be described. The in-furnace tension T of the material is detected by the tension detecting section 37 supporting the tension detecting roll 35, and when the in-furnace tension T changes, the output of the tension detecting section 37 changes. Further, the traction force is adjusted by the powder clutch 30 according to the output of the tension detection unit 37. As a result, the force transmitted from the powder clutch 30 to the shaft 31 changes, and the shaft 3 moves according to the change in the traction force.
1. The sprocket 32 rotates in the forward or reverse direction. Furthermore, the rotation of the sprocket 32 causes the chain 33,
It is transmitted to the sprockets 25, 25 of the traction device 23 via the sprocket 28 and the shaft 24, and the chain 2
The dancer roll 19 is moved up and down by 6, 26 and the furnace tension T of the material S is adjusted to a predetermined value.

The adjustment of the transport speed of the material S will be described. When the transport speed of the material S fluctuates, the dancer roll 19 moves up and down according to the speed fluctuation. Then, the vertical movement of the dancer roll 19 is transmitted to the sprocket 25 and the shaft 24 via the chain 26, and the rotation angle thereof is detected by a position detection device such as the synchro 34. Also,
The detection value of the synchro 34 is output to the motor 13 and the rotation speed of the motor 13 is adjusted, whereby the rotation speed of the drive roll 8 is adjusted and the dancer roll 19 is controlled so as to be maintained in a regular position. The transport speed is adjusted to be constant. When adjusting the rotation speed of the motor 13, the pressure contact force of the nip roll 9 to the drive roll 8 may be adjusted by the cylinders 16 and 16 together.

The mechanism of the traction device 23 for moving the dancer roll 19 up and down is not limited to that in the above embodiment, but the traction force of the dancer roll 19 is determined based on the furnace tension T of the material S detected by the tension detector 37. Any mechanism may be adopted as long as it is a mechanism for adjusting, and the tension adjusting device is not limited to the above embodiment. Further, the mechanism for detecting the tension in the furnace and the position detecting device are not limited to those in the above embodiment, but may be detected by a mechanical method. Further, although the seal roll pair 7 is provided inside the casing 2, it may be provided outside the casing 2. in this case,
Naturally, the seal members 17 and 18 are also arranged outside.

[0021]

As is clear from the above description, in the furnace tension control device for the vertical annealing furnace according to the present invention, the casing connected to the annealing furnace has the inlet side opening portion which seals with the seal roll pair. Because it is completely sealed by the member,
The atmosphere in the furnace does not leak to the outside from the inlet side opening and the outside air does not enter the furnace, and the thermal efficiency of the furnace is good, and a safe and clean environment can be realized. Further, since the roll seal is adopted instead of the felt seal, the material is not damaged and the quality of the material can be maintained in good condition. In addition, the tension inside the furnace is adjusted by moving the dancer roll up and down, and since there is no need for a material, such as a seal, at the connecting portion between the casing and the furnace, which hinders the material transfer.
It is possible to detect the tension inside the furnace accurately and adjust the tension inside the furnace appropriately based on the result. In particular, the tension can be finely controlled even with a thin material having a small tension in the furnace.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a furnace tension control device according to the present invention.

FIG. 2 is a cross-sectional view showing a schematic configuration of a furnace tension control device according to the present invention.

[Explanation of symbols]

F ... Vertical annealing furnace, Fe ... Inlet side opening, Fi ... In furnace, S ...
Material, 1 ... Tension control device, 2 ... Casing, 3 ... Inlet side opening, 4 ... Outlet opening, 7 ... Seal roll pair, 8 ... Drive roll, 9 ... Nip roll, 13 ... Drive motor, 17,
18 ... Seal member, 19 ... Dancer roll, 23 ... Traction device, 30 ... Powder clutch, 34 ... Position detection device (synchro), 37 ... Tension detection device, 38 ... Tension adjustment device.

Claims (1)

[Claims] 1. A furnace tension control device for a vertical annealing furnace, which heat-treats a strip-shaped material while continuously conveying it in the vertical direction, comprising an inlet opening and an outlet opening connected to the annealing furnace. A casing, a seal roll pair disposed near the inlet side opening of the casing and feeding a material into the casing through the inlet side opening, and a seal member provided between the casing and the seal roll pair, A dancer roll rotatably and vertically movably supported inside the casing, around which the material that has passed through the pair of seal rolls is wound, and a dancer roll rotatably supported inside the casing to support the dancer roll. The tension detecting roll that sends the passed material toward the outlet side opening of the casing and the load acting on the tension detecting roll are detected to detect the tension in the furnace A tension detecting device, a tension adjusting device that adjusts the tension in the furnace of the material by adjusting the traction force of the dancer roll based on the output of the tension detecting device, and a position detecting device that detects the position of the dancer roll. A drive motor for controlling the drive of the pair of seal rolls based on the detection value of the position detection device, and an internal tension control device for a vertical annealing furnace.