JP2774759B2 - Strand looper tension controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension setting control for a process line having a strand looper for accumulating strips.

[0002]

2. Description of the Related Art In a process line, a tension setting of a strip is determined by various conditions such as a product thickness, a plate width, and a processing material, and the setting has a great influence on ensuring the quality of a final product. FIG. 11 is a view showing a conventional strand looper tension control device. In the figure, reference numeral 1 denotes a tension setting device, which sets a tension set value corresponding to the above-mentioned various conditions of the strip. Reference numeral 2 denotes a contact for setting the tension set value of the tension setter 1 to the driving device 3.

[0003] 4 is an electric motor for applying tension to the strip 9,
5 is a mechanical device for transmitting the power of the electric motor 4, 6 is a deflector roll for transporting the strip 9, 6a is a movable deflector roll, and 6b is a fixed deflector roll. Reference numeral 7 denotes a carriage, which supports the movable deflector roll 6a, moves up and down, and accumulates a strip 9 between itself and the fixed deflector roll 6b. Note that a strand looper device is formed by the deflector roll 6 and the carriage 7. Reference numeral 8 denotes a bridle roll for feeding a coil (strip wound in a coil shape) 9a.

Next, the operation will be described. Tension setting device 1
Is calculated based on the plate thickness, the plate width, the material, and the unit tension applied to the processing material. The contact 2 is a timing contact for transmitting the tension set value calculated by the tension setter 1 to the driving device 3, and the driving device 3 drives the electric motor 4 based on the given tension setting value, and the mechanical device 5 and the carriage. 7
To apply tension to the strip 9 in the direction of stretching the strip 9 via the deflector roll 6.

When the strip 9 is lost in the coil 9a,
At the inlet side of the strand looper device, the tail end of the strip 9 is connected with a welding machine to the tip end of the strip 9 of the new coil 9a to be delivered next. At this time, by bringing the carriage 7 closer to the fixed deflector roll 6b, the outlet side of the strand looper device sends out the strip 9 at a constant speed. it can. After the end of the strip 9 has been connected (this state is called strip discharge), the carriage is lifted up and returned to its original position, and the strip 9 is accumulated in the strand looper device. (This state is referred to as strip addition.) A state in which the speed of the normal strip 9 on the inlet side and the strip 9 on the outlet side is constant is called synchronizing.

FIG. 12 shows the operation from the normal line operation (during synchronization) to the connection of the strip end.
Connection is performed in the order of c, d, and e.

[0007]

Since the conventional strand looper tension control device is constructed as described above, when the strip is connected, the thickness and width of the processing material are changed between the current strip and the next strip. When various conditions such as unit tension applied to the material and the processing material are different, it is necessary to change the tension set value from the current set value to the next set value. That is, the process line needs to connect the strips on the inlet side of the strand looper device to form a continuous strip, and change the tension setting at the connection point of the strip. Conventionally, the tension is set at the entrance or exit of the strand looper. If set at the inlet or outlet in this way, the tension setting change point is not an appropriate setting according to the passage of the strip through the looper, but also the mechanical loss of the deflector roll is added, causing tension fluctuation and adversely affecting the product There was a problem.

Further, in the case of a continuous process line, the front coil (the strip running the strand looper device) and the rear coil (the next coil) are connected by a welding machine. The tension becomes zero,
Here, the tension suddenly changes, and a sudden load is applied to the bridle roll 8 in front of the looper, and the bridle roll 8
Overloading of the vehicle.

The cause of this occurrence will be described with reference to FIG. When the strip 9 is eliminated from the coil 9a, the tension on the tail end side of the strip 9 becomes zero, so that the bridle roll 8 has a problem that the entire tension is suddenly applied and overloaded.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and smoothly changes the tension at the connecting point of the strip to suppress the fluctuation of the tension generated when the connecting point of the strip passes through the looper. Another object of the present invention is to provide a tension control device that performs stable tension control and performs stable operation.

It is another object of the present invention to provide a tension control device that smoothly changes the load of a bridle roll and performs stable tension control.

[0012]

SUMMARY OF THE INVENTION A strand looper tension control device according to the present invention comprises a strip passage calculating means for detecting and calculating the passage of a strip connection point in a strand looper device, and a current value based on a current strip tension setting value. And a tension transition calculating means for sequentially shifting the tension set value to the next strip while the connection point of the strip passes through the inside of the strand looper device based on the calculation result of the strip passage calculating device. .

Also, at the entrance side of the strand looper device,
A calibration detector for detecting a connection point of the strip, a strip transport amount detector for measuring a feed length of the strip at an entrance side of the strand looper device, and a carriage position detector for measuring a carriage position of the strand looper, While calculating the length measurement of the strip from the connection point with the connection point detection signal from the calibration detector and the strip length measurement signal from the strip conveyance amount detector,
A strip passage arithmetic unit that corrects a length measurement of a strip from a connection point according to a carriage position signal from a carriage position detector, and a transition of a tension set value from a current strip tension set value to the next strip. A tension transition calculating device for sequentially performing the operation while the connecting point of the strip passes through the inside of the strand looper device based on the calculation result of the passage calculating device.

A line state function generating means for calculating a state from the time when the remaining amount of the coil strip becomes equal to or less than the predetermined remaining amount to the time when the remaining amount becomes zero; And a tension transition calculating means for sequentially shifting to a predetermined tension set value for preventing the bridle roll from being overloaded when the remaining amount is zero, based on the output of the line state function generating means.

Further, while the strip connection point is passing through the inside of the strand looper device, a speed reference value of a drive system for driving the fixed deflector roll at a preset load factor based on a calculation result of the strip passage calculation device. Is provided with a load distributor for sequentially correcting

[0016]

The strand looper tension control device of the present invention
While the connection point of the strip is passing through the strand looper device, the transition from the tension setting value of the current strip to the tension setting value of the next strip is sequentially performed, and the transition is performed via the carriage according to the transition of the tension setting value. Control and suppress tension fluctuation.

Further, the feed length of the strip from the connecting point of the strip is measured, the measured value is corrected at the carriage position, the passage of the strip is calculated based on the corrected measured value, and the corrected value is calculated. For each predetermined length measurement, the transition of the tension set value from the current strip tension set value to the next strip is performed sequentially, and control is performed via the carriage in accordance with the transition of the tension set value, thereby controlling the tension fluctuation. Suppress.

The transition from the current set tension value of the strip to a predetermined set tension value for preventing the bridle roll from being overloaded when the remaining amount of the strip of the coil is zero is performed when the remaining amount of the strip of the coil becomes zero. During the period from when the remaining amount becomes equal to or less than the predetermined remaining amount until the remaining amount becomes zero,
In accordance with the transition of the tension set value, the tension is controlled via the carriage to prevent the bridle roll from being overloaded.

While the strip connection point is passing through the inside of the strand looper device, the speed reference value of the drive system for driving the fixed deflector roll is sequentially corrected according to a preset load factor, and the corrected speed reference value is corrected. Controls the motor driving the fixed deflector roll.

[0020]

【Example】

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to FIG. In the figure, reference numerals 1 to 9 are the same as those of the related art, and will not be described. Note that the contact 2 is omitted in the present invention because it is absorbed in the fifteen tension transfer operation devices. Reference numeral 10 denotes a strip transport amount detector (PLG) for measuring a strip transport amount attached to the bridle roll 8 installed in front of the strand looper device, and 11 detects a connection point of the strip and finishes the operation of the present device. The calibration detector 12 used for the above-mentioned operation is a carriage position detector for measuring the position of the carriage.

Numeral 13 denotes a strip passage arithmetic unit for measuring a strip passing position based on signals from the strip transport amount detector 10 and the calibration detector 11, 14 a next tension setter for determining a next tension set value of the strip,
Reference numeral 15 indicates the current preset tension to the next preset tension for each strip passing position (position at which the strip 9 passes through the fixed deflector roll 6b) based on signals from the tension setting device 1, the next tension setting device 14, and the strip passing calculation device 13. Is a tension shift calculating device for calculating the shift of the tension.

It should be noted that the strip passage calculating device 13, the strip transport amount detector 10, and the calibration detector 1
1 and the carriage position detector 12 constitute a strip passage calculating means.

Next, the operation will be described. The strip passage arithmetic unit 13 uses the signal from the strip transport amount detector 10 to determine the mechanically determined strip movement amount of the strand looper up to the fixed deflector roll 6b, and the calibration detector 9 to connect the strip. The calculation is performed each time a point is detected.

FIG. 2 shows the state of the strip connection point detection, which will be described with reference to FIG. 2a and 2b, when the position of the carriage 7 is not moving at present and is in a fixed state (during synchronization), the calibration detector 11 detects the connection point of the strip 9 at the detection position of A, The distance from the detection point of the calibration detector 11 to the position B of the fixed deflector roll 6b is calculated by a signal from the strip transport amount detector 10 according to this detection signal. From this calculated distance, the fixed deflector roll 6b
The fixed distance between B and C is obtained. From this calculation result, a point at which the connection point reaches the position of the fixed deflector roll is predicted, and the timing is output to the tension transition calculating device 15 each time the connection point reaches each fixed deflector roll 6b according to this prediction.

The carriage position detector 12 of the strand looper is used to correct the fixed distance calculation, and when the position of the carriage 7 moves as shown in FIG. Amend,
Correction is performed so that the connection point accurately reaches the position of each fixed deflector roll 6b, and the timing is output to the tension transition calculating device 15.

In the tension transition calculating device 15, the current tension set value (pre-tension set value) and the next tension set value (post-tension set value)
Is provided as shown in FIG. Each time the connection point of the strip 9 passes through the fixed deflector roll 6b, the set value is changed step by step, and finally the next tension set value is set. The driving device 3 controls the electric motor 4 based on the change in the set value of the tension, and the mechanical device 5
To operate the carriage 7 to obtain a predetermined tension. In this manner, the transition of the tension at the connection point of the strip 9 is smoothly performed, and the tension fluctuation generated when the connection point of the strip 9 passes through the looper can be suppressed, and stable tension control can be performed.

That is, the tension shift calculating device 15 is a function generator that changes the amount of change between the pre-tension set value and the post-tension set value stepwise according to the number of the fixed deflector rolls 6b. The output signal of the strip passage arithmetic unit 13 is output each time the strip 9 passes through the position of each fixed deflector roll 6b.
5, the transition from the setting of the pre-tension to the setting of the post-tension is performed stepwise as the connection point passes through the deflector roll position as shown in FIG. The stepwise changed tension set value of the tension shift calculating device 15 is transmitted to the driving device 3, and a smooth tension shift can be performed every time the connection point passes through the fixed deflector roll 6b.

FIG. 4 shows a flowchart of this operation.
At S1, the connection point is detected by the calibration detector 11, and at S2, the measured length Lm up to each of the n fixed deflector roll positions is stored. If the sum of the memory value Lm and the value LL obtained by correcting the memory value Lm with the signal from the carriage position detector becomes equal to the passage detection distance LCNT of the connection point by the strip transport amount detector 10 in S3, a tension switching command is transmitted in S4. In step S5, the electric motor 4 controls the tension via the carriage 7. In step S6, the number of the fixed deflector roll is checked, and the tension is sequentially switched from the first one.

FIG. 3 shows a case where the set value of the post tension is larger than the set value of the pre tension. However, the set value of the post tension may be smaller depending on various conditions such as the thickness of the sheet. Similarly, the set value is gradually reduced.

Embodiment 2 FIG. Next, measures for overloading the bridle roll 8 will be described. In the first embodiment, the transition of the tension setting at the connection point is described as being performed every time the fixed deflector roll 6b passes. However, when the next connection point is given in advance, the tension change value at the next connection point is given. May be calculated and the tension may be shifted stepwise before a sudden change in tension occurs.

Using the stepwise tension transfer means of the present invention,
If the tension of the strand looper is gradually reduced before the end of the strip dispensing, and the tension is reduced to a predetermined tension for preventing the bridle roll from being overloaded, the bridle roll can be prevented from being overloaded, and adverse effects due to sudden changes in the tension can be prevented. The effect can be expected.

FIG. 5 is a block diagram thereof, in which a line state function generator 16 is provided. In the line state function generator 16, as the strip 9 is fed, the coil diameter of the coil 9a gradually decreases, but when the coil diameter becomes equal to or smaller than a predetermined coil diameter (the remaining amount of the strip 9 becomes equal to or smaller than the predetermined remaining amount), the coil 9a becomes smaller. The length is calculated from the predetermined coil diameter until the coil diameter becomes zero (until the connection point at the tail end of the strip), and this length is divided into predetermined n steps, and from the time when the predetermined coil diameter is reached The length up to the n division points is obtained, and each time the length is equal to the strip measurement signal from the strip conveyance amount detector 10, overload of the bridle roll 8 is prevented from the current tension set value. The tension set value is gradually reduced to a predetermined tension set value in order to prevent the bridle roll 8 from being overloaded. That is, before the bridle roll 8 is overloaded, the tension is gradually reduced to prevent the overload.

FIG. 6 is a flowchart of the second embodiment. When the coil diameter becomes equal to or smaller than the predetermined value X at T1, the counting by the strip conveyance amount detector 10 is started at T2,
In step 3, the length LT of the coil from the coil diameter X until the strip becomes zero is calculated, LT is divided into desired n stages, and the distance Lx from the time of the coil diameter X to each division point is stored.
However, Lx = L1, L2, L3,... Ln. If the measured length Lx becomes equal to LCNT from the count by the strip carrying amount detector 10 at T4, a tension switching command is sent out at T5, and the motor 4 is turned on at T6 according to the tension switching command.
Control. This is repeated n times by checking T7.

Embodiment 3 FIG. 5 and 7 show modifications of the second embodiment.
Will be described. The block diagram is the same as FIG. 5, but the operation is slightly different. In the block diagram of FIG. 5, in the line state function generator 16, as the strip 9 is sent out, the coil diameter of the coil 9 a is gradually reduced. In the following, the virtual connection point of the strip is calculated from the coil diameter, and the length measurement of the strip from the virtual connection point is calculated based on the strip length measurement signal from the strip conveyance amount detector 10. Each time it passes through each fixed deflector roll 6b, the tension set value is gradually reduced from the current tension set value to a predetermined tension set value for preventing the bridle roll 8 from being overloaded. Prevent load. That is, before the bridle roll 8 is overloaded, the tension is gradually reduced to prevent the overload.

FIG. 7 shows a flowchart of the second embodiment. If the coil diameter becomes equal to or smaller than the predetermined value in U1, the counting by the strip conveyance amount detector 10 starts in U2, and U3
Stores the measured length Lm from the virtual connection point to the fixed deflector roll. In U4, the measured length Lm is corrected for LL by the carriage position detector 12, and the correction result and the LCNT from the count by the strip transport amount detector 10 are used.
If equal to, a tension switching command is sent out at U5, and the motor 4 is controlled at U6 according to the tension switching command. This is repeated n times by checking U7.

The feature of the third embodiment is that the steps after U3 are the same as those after the flowchart S2 in FIG. 4 of the first embodiment, and the method of signal processing and calculation of the first embodiment can be used. However, the difference is that a virtual connection point is determined, and the tension is transferred assuming that the virtual connection point has come to each fixed deflector roll.

Embodiment 4 FIG. In the first embodiment, the transfer of the strand looper tension is performed by passing the connection point of the fixed deflector roll, but similarly, the load factor of the driven fixed deflector roll is changed every time the connection point passes through each fixed deflector roll. In this case, the transition of the tension is performed more smoothly, and the fluctuation of the tension is reduced.

FIG. 8 is a block diagram of the fourth embodiment, and FIG. 9 is a block diagram of a main part thereof. Strip passage arithmetic unit 13
Is output to the load distributor 22. The load distributor 22 adds the load distribution of each fixed deflector roll 6b to the operating speed of the fixed deflector roll 6b, and
1 to control the electric motor 20.

As shown in FIG. 9, the load distributor 22 comprises an adder 23, n contacts 24, and n set load factors 25. The first to n-th fixed deflector rolls 6b from the strip passage arithmetic unit 13 are provided. The contact 24 is switched in accordance with the switching command, and the set load ratio 25 is sequentially switched. The speed reference is corrected by the adder 23 and a command is given to the driving device 21.

In the conventional apparatus, since the load factor of each fixed deflector roll is not set every time the connecting point of the strip passes through each fixed deflector roll, appropriate power transmission is not performed. In the fourth embodiment, the load factor is corrected at an appropriate timing, and the variation in tension can be reduced as in the first embodiment.

FIG. 10 shows a flowchart of the fourth embodiment. X1 to X4 and X6 are the same as the flowcharts S1 to S4 and S6 in FIG. 4 of the first embodiment.
The only difference is that the tension control of the fixed deflector roll is performed according to 0.

Embodiment 5 FIG. In the above embodiment, the tension set value was changed every time the connecting point of the strip passed the fixed deflector roll, but this change was made, for example, every time the fixed deflector roll and the movable deflector roll passed. You may. Further, the tension set value is changed stepwise, but the tension may be changed by generating a function so that the whole becomes curved. That is, the tension set value may be sequentially shifted.

Embodiment 6 The transition of the tension set value is calculated by measuring the strip connection point from a predetermined detection point and measuring the length of the strip to obtain a predetermined position (position of the fixed deflector roll) in the strand looper device. However, the speed of the strip is detected, the time required to reach a predetermined position (the position of the fixed deflector roll) is calculated based on this speed, and the tension set value is transferred based on this time. Good.

[0044]

As described above, according to the present invention, at the strip connection point or at the end of the strip, the tension set value is sequentially shifted, so that a sudden change in tension or a fluctuation in tension can be reduced. This has the effect of ensuring stable operation and contributing to the production of high quality products.

The transition from the current set tension value of the strip to a predetermined set tension value for preventing the bridle roll from being overloaded when the remaining amount of the strip of the coil is zero is performed when the remaining amount of the strip of the coil is reduced. Since the transition is made sequentially from when the remaining amount becomes equal to or less than the predetermined remaining amount to when the remaining amount becomes zero, there is an effect of preventing the bridle roll from being overloaded.

Further, while the strip connection point is passing through the inside of the strand looper device, the speed reference value of the drive system for driving the fixed deflector roll is sequentially corrected according to a preset set load factor. Controls the electric motor that drives the fixed deflector roll, so that the transition of the tension is performed more smoothly, and there is an effect that the fluctuation of the tension is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a strand looper tension control device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a strand looper device of the present invention and connection points.

FIG. 3 is a diagram showing the relationship of the tension setting of the tension shift calculator according to the present invention.

FIG. 4 is a flowchart of Embodiment 1 of the present invention.

FIG. 5 is a block diagram of a strand looper tension control device according to a second embodiment of the present invention.

FIG. 6 is a flowchart of Embodiment 2 of the present invention.

FIG. 7 is a flowchart of Embodiment 3 of the present invention.

FIG. 8 is a block diagram of a strand looper tension control device according to a fourth embodiment of the present invention.

FIG. 9 is a block diagram of a main part of a fourth embodiment of the present invention.

FIG. 10 is a flowchart of a fourth embodiment of the present invention.

FIG. 11 is a block diagram showing a conventional strand looper tension control device.

FIG. 12 is a diagram illustrating a strip connection operation.

FIG. 13 is a diagram illustrating an overload of the bridle roll.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tension setting device 3 drive device 4 electric motor 5 mechanical device 6 deflector roll 6 a movable deflector roll 6 b fixed deflector roll 7 carriage 8 bridle roll 9 strip 9 a coil 10 strip conveyance amount detector 11 calibration detector 12 carriage position detector 13 Strip passing calculation device 14 Order tension setting device 15 Tension transition calculation device 16 Line state function generator 17 Load distributor 20 Motor 21 Drive device 22 Load distributor 23 Adder 24 Contact 25 Set load factor

Claims (4)

(57) [Claims] 1. A strip is alternately passed between a movable deflector roll and a fixed deflector roll on a carriage side of a strand looper device, and the strip is sent from the entrance side to the exit side of the strand looper device and set. When the tension of the strip is controlled via the carriage with the applied tension and the tail end of the strip is connected to the leading end of another strip to be fed next at the entrance side, the carriage is fixed to the fixed deflector roll. In a strand looper tension control device that controls the carriage to return to its original position and to operate after the end of the strip is connected, by stopping the feeding of only the strip on the inlet side by approaching the strip. Check that the connection point passes through the strand looper A strip passage calculating means for detecting and calculating, and a transition of the tension set value from the current strip tension set value to the next strip, wherein the connection point of the strip is determined by the strand looper based on a calculation result of the strip pass calculation device. A strand looper tension control device comprising: a tension transition calculating means for sequentially performing a tension transition while passing through the inside of the device. 2. Strips are alternately passed between a movable deflector roll and a fixed deflector roll on the carriage side of the strand looper device, and the strip is sent from the inlet side to the outlet side of the strand looper device and set. When the tension of the strip is controlled via the carriage with the applied tension and the tail end of the strip is connected to the leading end of another strip to be fed next at the entrance side, the carriage is fixed to the fixed deflector roll. A stop of the strip only on the inlet side by stopping the end of the strip, and after connecting the end of the strip, the strand looper tension control device for controlling the carriage to return to the original position and operate the carriage. Detects the connection point of the above strips at the entrance side of the device Calibration detector,
At the entrance side of the strand looper device, a strip transport amount detector that measures the feed length of the strip, a carriage position detector that measures the carriage position of the strand looper, and a connection check from the calibration detector. A strip length measurement from the connection point is calculated based on the output signal and a strip length measurement signal from the strip conveyance amount detector, and a strip length from the connection point is determined according to a carriage position signal from the carriage position detector. A strip passing arithmetic unit that corrects the length measurement of the strip, and the transition of the tension set value from the current strip tension set value to the next strip is performed based on the calculation result of the strip pass arithmetic unit. And a tension shift calculating device for sequentially performing the movement while passing through the strand looper device. Strand looper tension control device to. 3. A coiled strip is fed out by a bridle roll, and then the strip is alternately passed between a movable deflector roll and a fixed deflector roll on the carriage side of the strand looper device, and the strip is passed through the entrance of the strand looper device. From the side to the outlet side, while controlling the tension of the strip through the carriage with the set tension, the tail end of the strip at the inlet side to the tip of another strip to be sent out next When connecting, the carriage is approached to the fixed deflector roll to stop the feeding of only the strip on the entrance side, and after the end of the strip is connected, the carriage is returned to the original position and operated. In the strand looper tension controller for controlling, the coil A line state function generating means for calculating a state from the time when the remaining amount of the strip becomes equal to or less than the predetermined remaining amount to the time when the remaining amount becomes zero; And a tension transition calculating means for sequentially shifting to a predetermined tension set value for preventing an overload of the bridle roll based on the output of the line state function generating means. Control device. 4. The strand looper tension control device according to claim 1, wherein a preset value is set based on a calculation result of the strip passage calculation device while the strip connection point passes through the inside of the strand looper device. A load distributor that sequentially corrects a speed reference value of a drive system that drives the fixed deflector roll according to a load factor, and controls the motor that drives the fixed deflector roll based on the corrected speed reference value. Characteristic strand looper tension control device.