JPH033851A - Control method of looper - Google Patents

Abstract

PURPOSE:To prevent the secondary rupture of a steel belt by speedily stopping a fixed roll by way of driving its disc brake as well as quickly stopping inlet- side and outlet-side PLYDOL rolls as soon as the occurrence of a plate rupture is detected. CONSTITUTION:When the existence of a plate rupture of a steel belt 1 in a looper 2 is judged in a discrimination circuit 19 and the occurrence of a plate rupture is detected, inlet-side and outlet-side PLYDOL rolls 3, 4 are quickly stopped. Simultaneously, a fixed roll 5A is speedily stopped by driving its disk brake. Consequently, it is possible to prevent the secondary rupture of the plate of the steel belt 1.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for controlling a looper installed in a line that continuously processes steel strips.

<Prior art> For example, when passing a steel strip through a continuous process line that processes the steel strip using processes such as an annealing furnace, plating equipment, pickling equipment, etc., the steel strip is stored before and after the process. Generally, a looper is provided for this purpose. This looper is used to store the steel strip in such a way that when the conveyance of the steel strip is temporarily stopped outside the process for welding or cutting, the conveyance of the steel strip is not stopped within the process and the conveyance speed does not change. It has the function of sending out steel 4)).

FIG. 5 is a block diagram showing an example of control of a looper in a continuous process line. It is installed between the exit bridle roll 4 provided in the center section (inlet zone of process P).

The looper 2 includes a plurality of fixed rolls 5, a plurality of movable rolls 6, and a carriage 7 that supports these movable rolls 6.
and a carriage motor 9 that moves the carriage 7 via a looper drum 8 in an ascending manner.

The rotational speed of the carriage motor 9 is controlled via the current control device 11 in accordance with a tension control command from the main control device 1o so that the tension of the steel 'IF1 in the looper 2 is constant. Note that the rotational speed at that time is detected by the speed detector 12 and inputted to the master control device 10.

On the other hand, the speed of steel 4iF 1 falling into the entry section is
The speed at the entrance bridle 1 call 3 and the speed at the center section are determined by the exit bridle roll 4, respectively, and the speeds of these man/exit bridle rolls 3.4 are determined by the standard given from the master controller 10. Speed, Zunawara entry side and exit side speed commands V E
, each priddle motor 13 according to V n
．． 14 is controlled by speed controller 1.5.1.6.

In this way, the carriage motor 9 and the priddle motor 1.3. II are respectively controlled to predetermined line speeds and tensions based on commands from the master controller]0.

<Problems to be Solved by the Invention> However, if the steel strip 1 breaks inside the coiled looper 2 or on its entry side, as illustrated in FIG. When the 9th speed stop command is output, the entry and exit bridle rolls 3
, 4 is the priddle motor 1.3.1. , l can be brought to a rapid stop by stopping the fixed rolls 5 and movable rolls 6 in the looper 2, but there is no drive source for the fixed rolls 5 and movable rolls 6, and there is no mechanical loss of their shafts, so it is difficult to stop the rolls. Due to the large 4m nature of jF l, it cannot be stopped quickly.

Therefore, the steel strip in the looper is moved to the exit side of the looper and remains near the exit bridle roll 4, causing a problem that secondary fracture occurs there.

This secondary fracture is more noticeable as the line speed is higher.

In order to prevent such problems, conventionally, as shown in FIG. 7, a brake shoe 1 is placed above the fixed roll 5.
7 is provided to press the steel strip 1 against the surface of the fixed roll 5 using an air cylinder 18, but even in this method, the pressure on the steel strip 1 by the brake shoe 17 is uniform. Since it is difficult to do so, there is a great risk that the steel strip I will be biased and cause secondary breakage.

In addition, recently, a "play key" motor is attached to the fixed roll 5 to drive them individually, and it is also possible to quickly stop the LJ.
However, there is a problem in that driving all of the fixed rolls 5, including the control device thereof, requires a large amount of equipment and maintenance costs.

An object of the present invention is to provide a looper control method that solves the above problems.

<Means for Solving the Problems> The present invention provides a steel strip that is stored by being wound around between a plurality of fixed rolls and a plurality of movable rolls supported by a movable carriage, and is provided before and after the steel strip. In a method for controlling a looper that threads a sheet while applying a predetermined tension (major) by an entrance bridle roll and an exit bridle roll, a disk play key roll is used as the fixed roll, and The theoretical moving speed of the carriage determined from the speed difference with the exit bridle roll is compared with its actual moving speed to determine whether or not the steel strip has broken. This method of controlling a looper is characterized in that the entry side bridle roll and the exit side bridle roll are quickly stopped, and the disc brake is activated to quickly stop the fixed roll.

<Function> According to the present invention, the presence or absence of plate breakage of the steel strip in the looper is quickly determined, and when it is detected that a plate breakage has occurred, the inlet side and outlet side brightness rolls are rapidly moved. Stop and fix + call that disc play 4
- It can be stopped quickly by activating it once.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of an embodiment according to the method of the present invention. Components that are the same as those in the conventional example are denoted by the same numerals, and their explanation will be omitted.

In this figure, the major difference from the conventional example is that the looper 2
The two features are that a fixed roll 5Δ with a disc brake is used for the fixed I call 5, and a plate breakage determination circuit 19 is added.

First, as shown in detail in Fig. 2, the fixed roll 5△ equipped with a disc brake has a disc 52 mounted on one side of its shaft 51, and brake pieces 53 are mounted on both sides of the disc 52. are set such that they can freely approach and separate from each other by a fluid cylinder 54.

When a rapid stop command due to plate breakage is issued from the plate breakage determination circuit 19, the electromagnetic valve 20 is opened and fluid pressure from a fluid source (not shown) operates the fluid cylinder 54 through the pipe 21, causing the brake piece 53 to move toward the disk. Press on both sides of 52 =
The brake function is demonstrated by J Rurugoto.

Next, the function of determining the presence or absence of a plate breakage and outputting a rapid stop command by the plate breakage determination circuit 19 will be explained with reference to FIG.

(1) First, the pJj theoretical moving speed (2) of the carriage 7 is determined by the following equation (11), where n is the loop path 1 of the looper 2 and the number of lands. In this case, the downward direction of the carriage 7 is assumed to be the positive direction.

v, = −(v, −V.) −−−−−・−(I)
Here, ■9 is a speed command to the entrance bridle roll 3, and V is a speed command to the exit bridle roll 4.

■ On the other hand, the actual moving speed (■) of the carriage 7 is the voltage E and current 1 of the looper motor 9. It is calculated using the following equation (2) using jh and load resistance R.

k・φG' (2) where k is the constant of the looper motor 9, φ is the motor field of the looper motor 9, and G' is the diameter and gear of the looper drum 8 for converting the rotation speed of the looper motor 9 into the carriage speed. This is a number that includes all ratios of pi.

Note that this actual moving speed (3) can also be determined by using the detection signal of the speed detector I2 of the looper motor 9.

■ Next, compare the theoretical moving speed ■ of the carriage 7 obtained from equation (1) with the actual moving speed ■□ from equation (2), and when the following relationship (3) 2 holds true, the steel It is determined that plate breakage of band 1 has occurred.

V, <V. −−−−−−−−−−−−−−−−−
-(3) ■ This plate breakage signal is output to the master control device 10, and at the same time, a rapid stop signal for the fixed roll 5Δ is output to the solenoid valve 20.

■ This rapid stop signal opens the solenoid valve 20, and fluid pressure is supplied to the fluid cylinder 54 of the disc brake, pushing the brake piece 53 against the disc 52. Like, everything comes to a rapid halt.

At this time, at the same time, the inlet and outlet bridle rolls 3,
4 is rapidly stopped based on a rapid stop command from the master control device 10.

Note that by finely adjusting the positional relationship between the brake piece 53 and the disc 52, the time required for stopping can be adjusted.
It is possible to make the stop time of the exit bridle rolls 3 and 4 considerably closer.

<Effects of the Invention> As explained above, according to the present invention, the steel inside the looper! The presence or absence of plate breakage is quickly determined, and as soon as it is detected that a plate breakage has occurred, the inlet and outlet bridle rolls are quickly stopped, and the fixed rolls are operated with their disc brakes. As a result, it is possible to stop the steel strip quickly, thereby making it possible to prevent secondary breakage of the steel strip, thereby suppressing a decrease in product yield and an increase in maintenance load.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an overview of an embodiment of looper control according to the method of the present invention, FIG. 2 is a front view showing an embodiment of a fixed roll used in the method of the present invention, and FIG. 3 is a block diagram showing an example of looper control according to the method of the present invention. Fig. 4 is an explanatory diagram showing the stopping state of the bridle roll and fixed roll in response to the speed command when the method of the present invention is applied; FIG. 5 is a block diagram showing an overview of a conventional example of looper control in a continuous process line.
FIG. 6 is an explanatory diagram showing the stopped state of the bridle roll and fixed roll in response to a speed command according to a conventional example, and FIG.
FIG. 2 is a perspective view showing an example of a conventional fixed roll stopping means. 7... Carrying, 8... Loupadora J19.
...This 1-Year Ridge Motor. 10 main control device, 11... current control device 1
2...Speed detectors 13, 14...Pridlemorphs 15, 16...Speed control device 19...Plate breakage determination circuit, 20...Solenoid valve 52...
・Disc, 53...Brake piece. 54...Fluid cylinder, P...Pml process. ■...Steel strip, 2...Looper 3...Inlet bridle roll 4...Outlet bridle roll 5H...Fixed roll, 6...Movable 1:] -/
l/.

Claims (1)

[Claims] The steel strip, which is stored by being wound around a plurality of fixed rolls and a plurality of movable rolls supported by a movable carriage, is fixed in a predetermined manner by an entry bridle roll and an exit bridle roll provided before and after the steel strip. In the looper control method that threads the sheet while applying a tension of and its actual moving speed to determine whether or not the steel strip has broken, and when it is determined that a break has occurred in the steel strip, the entry side bridle roll and the exit side bridle roll are quickly stopped, and the A method for controlling a looper, characterized in that the fixed roll is also quickly stopped by activating a disc brake.