JPS6284814A - Method and device for controlling rolling mill driving - Google Patents

Abstract

PURPOSE:To reduce a shock of the collision at biting a rolling material by detecting the rolling material to maintain rolls in accelerating state and after detecting the biting by rolling on a fixed speed basis. CONSTITUTION:When the rolling material is detected by detecting sensors 6a or 6b equipped nearby the rolling roll, the speed basis sent from a speed managing unit 12 to a motor control device 13 based on the detected revolutional speed of the motor is accelerated in the form of a ramp. Thereby, the revolution of the motor 4 is increased, a slipper 2 of the roll 1 and a spindle 3 are brought into contact with each other to reduce the shock at biting the rolling material in the rolls 1a, 1b. Further, the injury at the engaging part of the slipper 2 and the spindle 3 is preventd. When the biting of the material is detected by the detector 9, the constant speed basis is given to rotate the motor 4 at the fixed speed.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a drive control method and device for a rolling mill, and in particular to a rolling mill that makes it possible to reduce the impact caused when a rolled material is caught in a rolling mill. The present invention relates to a drive control method and device for a machine.

[Technical background of the invention and its problems]

FIG. 6 shows a conventional rolling mill for steel or non-ferrous metals, in which an upper roll 1a and a lower roll 1b are arranged facing each other, and one end side of the upper roll 1a and the lower roll 1b are respectively A slipper 2°2 is formed. A spindle 3.3 is engaged with each of the slippers 2, 2, and an electric motor 4.4 is connected to the end of each spindle 3.3. The upper roll 1a and the lower roll 1b are rotationally driven through each spindle 4.4 and slippers 3,3.

Until the rolled material is caught between the upper roll 1a and the lower roll 1b, each of the rolls 1a.

Due to the inertia state of 1b, a gap is formed between each spindle 3, 3 and the slipper 2, 2, as shown in FIG. When the rolled material is bitten, each roll Ia
, Ib in the counter-rotational direction, the spindles 3, 3 collide with the slipper 2.degree. 2, resulting in damage to the collision portions.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a drive control method and device for a rolling mill that can reduce W* caused by collision when rolled material is bitten. be.

[Summary of the invention]

In order to achieve the above object, the rolling mill drive control device of the present invention includes:
A detection sensor for detecting the rolled material installed near the rolling roller, a rotation speed detector for detecting the rotation speed of an electric motor that rotationally drives the roller, and a load cell for detecting the catching of the rolled material in the roller. , a speed main circuit that inputs each output signal of the detection sensor, rotation speed detector, and load cell and outputs it to an electric i-control device that controls the speed of the electric motor; The feature is that a speed reference for accelerating the rotational speed of the electric motor in a ramp-like manner is output from the time when the rolled material is detected by the load cell until the time when the load cell detects that the rolled material has been bitten. and,
In the rolling mill drive control method according to the present invention, after detecting a rolled material using a detection sensor installed near a rolling roller,
The speed reference given to the motor control device that controls the speed of the electric motor that drives the roller is accelerated in a ramp-like manner, and when the rolled material is bitten by the roller, the roller is held in an accelerated state, and the rolled material is bitten by the roller. The feature of this method is that after the blockage is detected, a constant speed reference is given to roll the material.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows an embodiment of the present invention, in which an upper roll 1
A conveying table 5 is arranged between the lower roll 1b and the lower roll 1b, a detection sensor 6 is provided above the conveying table 5, and a rolled material 7 is disposed on the upper surface of the conveying table 5.
is placed.

Figure 2 shows the control system based on the above rolling mill.
Backup rolls 8a and 8b are disposed in contact with the upper roll 1a and the lower O-ru 1b, respectively, and these backup rolls 8a and 8b detect the load when the rolled material is bitten and perform biting. An O-docell 9 for sending signals is attached (only the lower part is shown). Further, the roll 1 is connected to an electric llA4 via a transmission gear 10 (only the lower part is shown), and detection sensors 6a and 6b are provided above the front and rear sides of each roll 1a and 1b, respectively. The electric motor 4 also includes a rotation speed detector 11.
are connected to the rotation speed detector 11, load cell 9, and each detection sensor 6a.

The output signal of 6b is input to the speed master 12, and further,
This output signal of the speed master 12 is input to the electric motor 4 via the electric motor control device 13.

In this embodiment, when the rolls 1a and lb rotate in the normal direction, the front detection sensor 6a detects the rolled material, and when the rolls 1b rotate in the reverse direction, the rear detection sensor 6b detects the rolled material. Then, based on the motor rotation speed detected by the rotation speed detector 11, the speed reference sent from the speed master 12 to the motor control device 13 is accelerated in a ramp-like manner.

Therefore, the rotational speed of the electric motor 4 increases, and the slipper 2 and spindle 3 of the roll 1 move as shown in FIG.
Since they are in contact with each other, the impact when the rolled material is bitten by the rolls 1a and 1b can be reduced, and damage to the engaging portions of the slipper 2 and the spindle 3 can be prevented.

When the load cell 9 detects that the rolled material is caught, a constant speed reference is given to the motor 4 to rotate at a constant speed.

The control means for accelerating the motor rotational speed when the rolled material is caught may include means for varying the acceleration rate and means for keeping the acceleration rate constant.

First, the means for varying the acceleration rate determines the acceleration rate in accordance with the distance from the position where the rolled material is detected by the detection sensor 6a to the position where the biting of the roll 1 is detected by the load cell 9. That is, as shown in FIG. 4, if W detected by the rotation speed detector 11
b The output signal of 13 rotations is positive when the front detection sensor 6a is ON (normal rotation), and the output signal of the rear detection sensor 6b is O.
When it is N (at the time of reverse rotation), it is negative and is sent to an integrating circuit 14 such as a rotation number counter and integrated. In this integral circuit 14, the number of revolutions NR of the roll from detection of the rolled material to biting is corrected according to the following formula using the roll diameter D1 and the draft rate d.

jl=N -D-d Here, 1 is the distance value from the roll rotation speed detection value from the rolled material detection position to the roll biting detection position, and the draft rate d is d= (VR-V )/V.

It is determined by Here, vR is the roll peripheral speed (spa),
vi is the rolling entry speed (mp+). If the acceleration rate when accelerating by the speed difference between the conveying speed of the rolling mill and the rolling speed is controlled to be proportional to the distance 1 obtained by the above two equations, the acceleration state when the rolled material is bitten by the roll A speed reference such that the speed at that point in time is the rolling speed can be output to the motor control device 13.

Such a speed reference pattern, as shown in Fig. 5,
During forward rotation, t1 when rolling material is detected and rolling material biting it,
The ramp-like acceleration between , and t2-tl is determined by the given distance, and thereafter rolling is performed at the speed at t2 until t3 when the rolled material is separated.

In addition, after t4 when the rolling mill is reversed, as in the above-mentioned normal rotation, acceleration is ramped from the time t when the rolled material is detected to the time t6 when the rolled material is caught, and rolling is continued at a constant speed until t7 when the rolled material is caught away. It is done.

Further, the means for keeping the acceleration rate constant is such that after the rolled material is detected by the detection sensors 6a and 6b, it is accelerated at a constant acceleration rate α.

If the acceleration rate is constant, the rolling speed when the rolled material is bitten changes depending on the conveying speed from when the rolled material is detected until it is bitten. That is, when the conveyance speed is slow, the acceleration time becomes long and the rolling speed becomes higher than the predetermined value, and when the conveyance speed is fast, the rolling speed becomes lower than the predetermined value. In order to reduce such changes in rolling speed, the conveying speed may be controlled to vary according to a predetermined rolling speed, but there is no problem in practice even if such control is not performed.

〔Effect of the invention〕

As described above, the rolling mill drive control method and device according to the present invention detects the rolled material with the detection sensor and then accelerates the speed reference given to the motor control device, so that when the rolled material is bitten by the rollers, the speed reference is accelerated. Since the roller is maintained in an accelerated state, the gap between the roller slipper and the spindle on the motor side can be eliminated, and the impact caused by counter-rotational force acting on the roller when it is caught in rolled material can be reduced. It can be reduced to a mossy state. Therefore, it is possible to prevent damage to the contact portion between the slipper and the spindle and to perform smooth rolling.

[Brief explanation of drawings]

1 to 5 show examples of the present invention, in which FIG. 1 is a schematic configuration diagram of a rolling mill, FIG. 2 is a control system diagram, and FIG.
The figure is an explanatory diagram showing the positional relationship between the slipper and the spindle, Figure 4 is a control system diagram, Figure 5 is a time chart of rolling mill speed control, and Figure 6 is a schematic configuration diagram showing a conventional rolling mill.
FIG. 7 is an explanatory diagram showing the positional relationship between a conventional slipper and a spindle. DESCRIPTION OF SYMBOLS 1... Roller, 2... Slipper, 13... Spindle, 4... Electric motor, 5... Conveyance table, 6...
・Detection sensor, 7... Rolled material, 8... Backup roll, 9... Load cell, 10... Speed change gear, 1
1... Rotation speed detector, 12... Speed main circuit, 13
...Electric motor control device, 14... Integral circuit.

Claims (1)

[Claims] 1. A detection sensor for detecting rolled material installed near the rolling roller, a rotation speed detector for detecting the rotation speed of an electric motor that rotationally drives the roller, and a rolling material to the roller. a load cell that detects jamming of the motor, and a speed main circuit that inputs each output signal of the detection sensor, rotation speed detector, and load cell and outputs it to a motor control device that controls the speed of the motor. The main circuit outputs a speed reference for accelerating the rotational speed of the electric motor in a ramp-like manner from when the detection sensor detects the rolled material to when the load cell detects that the rolled material has been bitten. A drive control device for a rolling mill, characterized in that: 2. After detecting the rolled material by a detection sensor installed near the rolling roller, the speed reference given to the motor control device that controls the speed of the electric motor that drives the roller is accelerated in a ramp shape, so that the rolled material is A rolling mill characterized in that the rollers are held in an accelerated state when the material is bitten by the rollers, and after the biting of the material to be rolled is detected, a constant speed reference is given to roll the material to be rolled. drive control method.