JPH02212013A - Control method for flying shear machine - Google Patents

Abstract

PURPOSE:To make it possible for the sheared length accuracy to be compatible with a proper shearing speed by automatically modifying the speed even when a flying shear machine by rolling equipment produces the change such as deviation of the rate of acceleration in the shear machine itself due to speed modification after the completion of acceleration. CONSTITUTION:The peripheral travelling distance of a shear blade from the starting of acceleration of a travelling shear machine to the contact of the shear blade with a material to be sheared, and the speed of the flying shearing machine during shearing operation are previously set, and after the completion of acceleration of the flying shear machine a predicted value of an actual, peripheral flying distance of the shear blade is calculated. In response to the deviation of the predicted value from the setting flying distance, the speed of the flying shear machine is modified on the condition that the speed during the shearing operation conforms to the preset value. In this way, both desirable sheared length accuracy and proper shearing speed can be obtained. Thus, the speed is reduced from a point E where acceleration is completed, through Vb to Vb'', and returned to a proper shearing speed Vb after a certain time and the shearing is performed at a point F. In this case, an area [E F'' F''' E''] becomes a correct corrected amount of modification, and thereby the proper shearing speed Vb can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Aspects of the Invention] (Field of Industrial Application) The present invention relates to a method for controlling a running shear for rolling equipment.

(Prior Art) A general configuration of a control device for a running shearing machine is shown in FIGS. 1 and 2.

Figure 1 shows the configuration of the shearing machine and its drive system.
A and IB are the upper and lower rotating drums of the shearing machine.

2A and 2B are shearing blades attached to the rotating drums LA and IB, respectively; 3A, 3B, and 3G are gears that drive the drums of the shearing machine; 4 is a drive motor; 5 is a speed feedback sensor; and 6 is the rotational position of the drum. A drum angle detector 7 is a control device that receives a signal from the speed feedback sensor 5 and controls the speed of the electric motor 4.

Fig. 2 shows the layout of the shearing machine and devices related to shear control, where 8 indicates the material to be sheared.

9 is a conveyance table for feeding the material to be sheared into the shearing machine; 10
is a measuring roll that measures the moving distance of the material to be sheared,
11 is a pulse transmitter that rotates in accordance with the rotation of the measuring roll; 12 is a distance counter that counts the pulses of the pulse transmitter to measure the amount of movement of the material to be sheared; 13 is a material detector; and 14 is a main shearing machine. It is a control device.

When the shear drive motor 4 is stopped, the material to be sheared 8
When the material 8 is fed into the shearing machine, the shearing machine is activated and shears the running material 8 to be sheared during the running.

In other words, the shear command is the motor control device! 7, the drive motor 4 is started and the drum LA is activated.

Shearing is performed and stopped within one revolution of IB, thereby performing so-called start-stop shearing.

What is important in these shear systems is to precisely shear to a preset shear length and to maintain an appropriate shearing speed.

In this case, the peripheral speed of the shearing blade 2 is set to a speed that is somewhat higher than the speed of the material to be sheared 8 in order to improve sharpness,
When the material 8 to be sheared is sent by the conveyance table 9 and passes the measuring roll 10, and the leading edge is detected by the material detector 13, this detection signal is sent to the shear main controller 14, and based on this, The activation timing and appropriate shearing rate of the shearing machine are determined.

Once the start timing is determined, a shear start command is sent from the shear main control device 14 to the motor control device 7 after a certain time.
is output to start the electric motor 4.

The motor control device 7 receives a set shearing speed at the same time as the start command, and accelerates the drive motor 4 to a predetermined speed while observing the output of the speed feedback sensor 5 to perform shearing.

The distances QYgLgL@gΔL shown in FIG. 2 are respectively: al: shearing length, L: horizontal distance from the material detector 13 to the point where the shearing blade 2 rotates and contacts the material 8 to be sheared.

Lo: Horizontal distance from the material detector 13 to the point where the shearing blade 2 finishes shearing (bottom dead center), ΔL: From the point where the shearing blade 2 contacts the material 8 to be sheared to the bottom dead center of the shearing blade 2 It is the horizontal distance.

Here, a method for determining the activation timing of the shear master control device 14 will be explained with reference to FIGS. 2 and 3.

Figure 3 shows the speed relationship during shearing, where the horizontal axis is time and the vertical axis is the speed of the material to be sheared 8 and the shearing blade 2.
t jbp jst Vase Vbe engineering respectively.

tc: After the material to be sheared 8 passes through the material detector 13,
The time it takes for the shear to start.

tb: Acceleration time of shearing machine.

t3: From the time when the shearing machine acceleration is completed, the shearing blade 2 moves to the material 8 to be sheared.
time to contact.

v8: moving speed of shear material 8, ■b: Speed of shearing blade 2, Engineering: Lead rate (vb=I-v6) It is.

From Figures 2 and 3.

L + Q, = (Ls - ΔL) + jl.

= [AGHO] = (ABKOI + L ((REK) + (EFHK
))...phrase Here, [ ] indicates the area enclosed by each Alphabela, and this area corresponds to each distance.

That is, [ABKOI is the distance that the sheared material 8 moves within the time to.

becomes.

Further, the shear acceleration time tb is expressed as follows, where the acceleration is α.

On the other hand, (EFHK) corresponds to the circumferential movement distance of the shearing blade 2 from when the shearing machine is started until the shearing blade 2 contacts the material to be sheared 8, and since this distance is known in advance,
Patent featuring this feature (E FHK)” Qs
).

From the formula, (AGHO)=L+I2゜= (ABKO) + -! −([REK]+(EFH
K)) Therefore, by calculating tc from this equation, the activation timing can be determined.

In this way, the shearing machine main control unit [14 calculates to, and the shearing machine is started after tc time after the leading edge of the material passes the material detector 13. Conventionally, however, the shearing machine is started after acceleration is completed, that is, when the material is The speed of the shearing machine is corrected after time tc+tb has elapsed since the material passed through the material detector 13.

This is because during the tc+tb time, a discrepancy may occur between the actual values and the values of Vs and the shear acceleration rate α that were initially predicted by the shear main controller 14, and the This is because if the shearing machine is operated at a constant speed, the shearing length accuracy will be inconsistent.

Therefore, the distance that the material to be sheared 8 has actually moved from the time when the waiting time is determined (the time when the material detector 13 detects the material) is detected by the distance counter 12, and the rotation angle of the shearing machine is detected by the drum angle detector 6. The error from the initial calculated value is calculated based on the relative relationship between the two, and the speed of the shearing machine is corrected based on this.

That is, for example, as shown in FIG.
The peripheral speed of the shearing blade 2 is corrected from the initially determined Vb to V b/, and in this case, the peripheral speed of the shearing blade 2 takes a velocity trajectory from the shearing machine acceleration completion point E to E' and F'.

(Problem to be Solved by the Invention) However, in the conventional shearing machine control method described above, the shearing length accuracy can be improved by correcting the speed after starting the shearing machine, but since the speed has been corrected, the appropriate shearing speed Vb
The problem is that it differs from the

The present invention was made in consideration of the above-mentioned problems, and provides a rational control method for an inter-travel shearing machine that satisfies both shear length accuracy and appropriate shearing speed by modifying the speed after shearing machine acceleration is completed. is intended to provide.

[Structure of the invention]

(Means and effects for solving the problem) The present invention accelerates from a stopped state after detecting that the leading end of a material to be rolled traveling through a running shear for rolling equipment has reached a predetermined position, and after the acceleration is completed. In a method for controlling a running shear that shears the material to be sheared while running, the peripheral movement distance of the tip blade and the running shear from when the running shear starts accelerating until the shearing blade contacts the material to be sheared. The shearing speed of the shearing machine is set in advance, and after the traveling shearing machine completes acceleration, a predicted value of the actual peripheral movement distance of the shearing blade is calculated, and the traveling distance is adjusted according to the deviation between this predicted value and the above-mentioned movement distance setting value. The speed of the shear,
Correct the condition so that the speed during shearing matches the set speed above,
This makes it possible to obtain both the desired shear length and degree and the appropriate shear rate even if there is a deviation in the operating state due to an error in the acceleration rate of the running shearing machine.

(Example) An embodiment of speed correction according to the present invention is shown in FIG.

In Fig. 5, the -tan velocity is Vb from the acceleration completion point E.
to Vb'(Vb"<Vb') (time E')
, After a certain period of time, the proper shearing speed Vb is returned to c
Time point F1→F') Shearing is performed at time point F.

In this case, a predictive calculation is performed so that the area (EF'F'E') in FIG. 5 becomes the area [E F F'E'] in FIG.

Therefore, the area (EF'F''E') becomes the correct distance correction amount to ensure shear length accuracy, and it becomes possible to maintain the final shear rate at the appropriate shear rate Vb.

〔Effect of the invention〕

As explained above, according to the present invention, even if a change in the operating condition occurs in the shearing machine itself, such as an error in the acceleration rate, an appropriate speed correction is automatically performed, thereby improving shear length accuracy and optimal shear speed. A rational control method for a running shear that satisfies both can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a drive system of a running shearing machine to which the present invention is applied, and FIG. 2 is a control system diagram of the running shearing machine. 3 and 4 are diagrams showing the moving speed of the material to be sheared and the circumferential speed of the shearing blade of the shearing machine in the conventional method. FIG. 5 is a diagram showing the moving speed of the material to be sheared and the circumferential speed of the shearing blade of the shearing machine in the present invention. LA, IB... Rotating drum 2A, 2B... Shearing blades 3A to 3C... Gear 4... Drive motor 5...
Speed feedback sensor 6...Drum angle detector 7...Electric motor drive device 8.
... Material to be sheared 9 ... Conveyance table lO ...
Measuring roll 11...Pulse transmitter 12...
・Distance counter 13...Material detector 14...Shearing machine main control device agent Patent attorney Noriyuki Chika Yudo Sanno - Figure

Claims (1)

[Claims] Control of a running shearing machine for rolling equipment that accelerates from a stopped state after detecting that the leading edge of the material to be sheared running through the running shearing machine has reached a predetermined position, and shears the material to be sheared while running after acceleration is completed. In the method, the peripheral movement distance of the shearing blade from when the shearing machine starts accelerating until the shearing blade contacts the material to be sheared and the shearing speed of the shearing machine are set in advance, and the shearing speed of the shearing machine is set in advance. After the acceleration is completed, calculate the predicted value of the actual circumferential movement distance of the shearing blade, and adjust the speed of the running shear according to the deviation between this predicted value and the above-mentioned movement distance setting, so that the speed at the time of shearing becomes the above-mentioned setting speed. A method for controlling a running shear machine, characterized in that it is modified under conditions that match.