JPH02151311A - Controller for continuous rolling equipment - Google Patents

Abstract

PURPOSE:To prevent a material to be rolled from being moved upstream side and to immediately stop the whole equipment by weakening the tension of a loop car and thereby reducing the influence of input tension of a group of rolling mills when the equipment is stopped. CONSTITUTION:Both speed reference signals 11a, 11b outputted from a main controller 12 to each rolling mill motor controller 8 and a bridle roll motor controller 10 are reduced at the same rate of change. Simultaneously, a monitoring speed reference signal 18 is inputted into a loop car tension controller 15. When the speed reference signals 11a, 11b take values under the rated speed, the monitoring speed reference signal 18, too, reduces the controller 15 outputs a tension lowering command 17 to a loop car motor controller 14 to set a tension reference signal 16 to a prescribed value. Then, when the speed reference signal 11 has made 0%, a brake holding command 19 is outputted to the bridle roll motor controller 10. By this method, the tension of the loop car 3 is weakened, the material 2 to be rolled can be prevented from being moved toward the upstream side by the tension on the inlet side of the group 5 of rolling mills.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is a method for rolling materials such as ferrous and non-ferrous materials from a loop car installed upstream to a downstream side through a bridle roll. The present invention relates to a control device for a continuous rolling facility that conducts rolling to a group of rolling mills.

(Prior Art) FIG. 2 shows a conventional example of continuous rolling equipment in which a material to be rolled is continuously rolled by guiding it from a loop car provided on the upstream side to a group of rolling mills provided on the downstream side via bridle rolls.

In the continuous rolling equipment shown in FIG. 2, a loop car 3 in which a large amount of material 2 to be rolled is accumulated is provided on the upstream side, and the material 2 to be rolled is provided downstream from this loop car 3 via a bridle roll 4. It is guided to a rolling mill group 5 and rolled. The rolling mill group 5 includes a plurality of rolling rolls 6 that continuously roll the material 2 to be rolled. A plurality of bridle rolls 4 are provided between the loop car 3 and the rolling mill 1'': 15 to prevent mutual interference between the two.

Each rolling roll 6 is driven by a rolling mill motor 7, which is controlled by a rolling mill motor control device 8. Further, each bridle roll 4 is driven by a bridle roll motor 9, and the bridle roll motor 9 is controlled by a bridle roll motor control device &10.

The rolling mill motor control device 8 and the bridle roll motor control device]0 have speed reference signals 11a and ll, respectively.
A master control device 12 that outputs b is connected.

The loop car 3 is driven by a loop car electric motor 13. Here, a rolling mill motor control device 8, a bridle roll motor control device 10, and a master control device 12 constitute a control device for a continuous rolling facility.

In the continuous rolling equipment shown in FIG. 2, during normal operation, the material to be rolled 2 travels from right to left in the figure as indicated by arrow P and is rolled by the rolling mill group 5.

During this time, the master control device 12 sends the following information to each rolling mill motor control device 8 and bridle roll motor control device 10.
Mutually independent speed standards 1 = No. 1a.

11b is output. This speed reference signal 11a.

11b is set in advance so that the tension within the rolling mill group 5 of the material to be rolled 2 and the tension on the five rolling mill group sides are each maintained at predetermined values.

In this type of continuous rolling equipment, when the tip of the material to be rolled 2 is passed through the rolling mill group 5, if the shape of the tip of the material to be rolled 2 is not suitable for biting into the rolling rolls 6, etc. During this period, it becomes necessary to stop the continuous rolling equipment. When stopping the continuous rolling equipment, considering that the rolled material 2 is continuously connected to the rolling mill group 5, each bridle roll 4, and the loop car 3, each rolling mill motor control device 8 and bridle roll The continuous rolling equipment is stopped as a whole by reducing the speed standards No. 15 11a and llb output to the motor control device 10 to zero at the same rate of change.

(Problem to be Solved by the Invention) When stopping the continuous rolling equipment as described above, conventionally, the speed reference signal 11a output to each motor control device 8, 10
, llb are reduced at the same rate of change. However, with this control mode, niQ? In the case of XJ, even though the speed reference signals 11a and llb are completely zero, the rolling rolls 6 and the rolled material 2 of the rolling mill group 5 do not stop immediately, but stop after a while. A phenomenon was observed.

This phenomenon is caused by the tension that acts on the rolled material 2 between the rolling rolls 6 of the rolling mill group 5 and the tension that acts on the rolled material 2 at the entrance side of the rolling mill group 5.
It has been found that the relative relationship between the tension and the tension acting on the rolling stock 2 is generated based on the fact that the material 2 to be rolled is moved upstream when the continuous rolling equipment is stopped. That is,
A speed reference signal 11a output from the main control device 12,
This is considered to be because when llb becomes close to zero, the equilibrium state between the continuous rolling equipment and the rolled material 2 collapses. - For boat fishing, the tension acting on the rolled material 2 when the continuous rolling equipment is stopped is greater on the entry side of the rolling mill group 5 than on the inside of the rolling mill group 5. It will be moved from within the group 5 towards the entry side of the rolling mill group 5, ie from the downstream side to the upstream side.

The present invention has been made in consideration of these points, and it is an object of the present invention to provide a control device for continuous rolling equipment that can immediately stop the continuous rolling equipment and the rolled material when the continuous rolling equipment is stopped. purpose.

(Means for Solving the Problems) In order to achieve the above object 1, the control device for continuous rolling equipment of the present invention operates the rolling mill group and the bridle rolls at a predetermined speed in order to run the material to be rolled at a predetermined speed. a speed control means for controlling the speed according to a speed standard; a tension control means for controlling the tension of the loop car according to a predetermined tension standard in order to adjust the tension applied to the rolled material; According to the above configuration, when the continuous rolling equipment is stopped, the tension control means reduces the tension reference to a predetermined value when When the speed reference falls below a predetermined value, the tension reference signal from the loop car tension control means is lowered to a predetermined value, thereby preventing the tension of the rolling mill motor from decreasing and the material to be rolled being moved upstream. can do.

(Embodiment) FIG. 1 shows an embodiment of a control device for continuous rolling equipment according to the present invention. Here, the same components as in FIG. 2 are given the same reference numerals, and individual explanations thereof will be omitted.

In the apparatus of FIG. 1, the loop car motor 13 is controlled by a loop car motor control device 14. In the apparatus shown in FIG. The loop car motor control device 14 includes a loop car tension control device 15.
The loop car motor control device 14 controls the loop car motor 13 according to the tension reference signal 16 . A monitoring speed reference signal 18 is given to the loop car tension control device 15 from the master control device 12, and when this monitoring speed reference signal 18 becomes a predetermined value or less, a signal is sent from the loop car tension control device 15 to the loop car motor control device 14. In response, a tension reduction command 17 is output, and the tension acting on the rolled material 2 at the relevant portion via the loop car electric motor 13 and the loop car 3 is weakened. moreover,
The bridle roll motor control device 10 includes a master control device 12 for applying a brake to the bridle roll motor 9 when the tension of the loop car 3 drops to a predetermined value according to the tension reduction command 17 output from the loop car tension control device 15. One brake hold command is given from The speed reference signals 11a, 11b and the brake hold command 19 input to the bridle roll motor control device 10 are switched by a switching contact 20.

The operation of the apparatus shown in FIG. 1 constructed as above will now be described.

During normal operation, a speed reference signal 11a is sent from the master control device 12 to each rolling mill motor control device 8 and bridle roll motor control device 10, respectively.

1, 1 b is given. During this time, the speed reference signal 11a
, llb are set so that the tension acting on the material to be rolled 2 is maintained at a predetermined value between the rolling rolls 6 of the rolling mill group 5 and at the entrance side of the rolling mill group 5, respectively. At the same time, the tension reference 16 output from the loop car tension control device 15 is set so that the tension of the loop car 3 is maintained at a predetermined value.

Next, the continuous rolling equipment is to be stopped. In this case, first, the main control device 12
and both speed reference signals 11a output to the bridle roll motor control device 10.

11b is decreased at the same rate of change. At the same time, a monitoring speed reference signal 18 is manually input to the loop car tension control device 15. When the speed reference signals 11a and llb reach a value equivalent to, for example, 1% or less of the rated speed, the monitoring speed reference signal 18 also decreases in proportion to the value, so the loop car tension control device 15 adjusts the tension to the loop car motor control device 14. The lowering command 17 is output, and the tension reference signal 16 is set to, for example, the initial value of 8096. And the speed reference signal 11 is 0%
When the bridle roll motor control device 10
One brake hold command is output for each brake hold command.

By controlling as described above, as the rolling mill electric motor 7 and bridle roll electric motor 9 are stopped, the tension of the loop car 3 is first weakened, thereby reducing the influence of the tension on the entry side of the rolling mill group 5. It is possible to prevent the phenomenon in which the rolled material 2 is moved upstream due to the tension on the side of the five machine group.

Furthermore, with the complete stop of the rolling mill electric motor 7 and the bridle roll electric motor 9, the bridle roll electric motor 9
By holding the rolled material 2 using the brake holding command 19, it is possible to more reliably prevent the phenomenon in which the rolled material 2 is moved upstream due to the tension on the rolling mill group 5 wood side.

〔Effect of the invention〕

As detailed above, according to the present invention, when the equipment is stopped 1-, the loop car tension is first weakened as the rolling mill group and bridle rolls are stopped, thereby reducing the influence of the entry side tension of the rolling mill group. Therefore, it is possible to prevent the material to be rolled from being moved upstream by the tension of the rolling mill electric motor, thereby making it possible to immediately stop the entire continuous rolling equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a control device for a continuous rolling facility according to the present invention, and FIG. 2 is a block diagram showing a conventional control device for a continuous rolling facility. 2... Material to be rolled, 3... Loop car, 4... Bridle roll, 5... Rolling mill group, 6... Roll roll, 7... Rolling mill electric motor, 8... Rolling mill Motor control device, 9... Bridle roll electric motor, 10... Bridle roll electric motor control device, lla, llb... Speed reference signal, 12... Main control device, 13... Loop car electric motor, 14...・Loop car motor control device,
15... Loop car tension control device, 16... Tension reference signal, 17... Tension drop command, 18... Speed reference signal for monitoring, 19... Brake holding command, 20...
Switching contact.

Claims (1)

[Scope of Claim] A control device for a continuous rolling facility that continuously rolls a material to be rolled by guiding the material to be rolled from a loop car provided on the upstream side via a bridle roll to a group of rolling mills provided on the downstream side, comprising: Speed control means for controlling the speed of the rolling mill group and bridle roll according to a predetermined speed standard so as to run at a predetermined speed; and controlling the tension of the loop car according to a predetermined tension standard for adjusting the tension applied to the rolled material. and means for lowering the tension reference to a predetermined value when the speed reference becomes equal to or less than a predetermined value when stopping the running of the rolled material. Control device.