JPS59130617A - Device for instructing speed of processing line - Google Patents

Abstract

PURPOSE:To prevent the flaw of a strip caused by the generation of a slip between bridle rolls, by adding the amount of elongation per unit length to a speed instruction after an elongation motor of a section with bridle rolls belonging to it. CONSTITUTION:A speed instructing device 21 is installed for bridle rolls located at the outlet side of an elongation motor 7, and outputs the sum of a speed instruction value for the outlet side and an instruction value for an elongation motor. Thus, the relative speed between mutual bridle rolls is invariant, and a strip tension is kept constant, and the slack and flaw of the strip are prevented.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a speed command when an elongation motor is used in a processing line. Adding the elongation rate to the speed command of other motors in the section, the strip tension decreases between that plydle roll and the next plydle roll, and in the worst case, the strip sag occurs, resulting in
This invention relates to a device that prevents strip flaws due to slippage between priddle rolls and provides optimal line operation.

[Prior art]

Continuous processing lines include, for example, continuous galvanizing lines and continuous annealing and pickling lines. Such a processing line is on the entry side, in the center.

It is divided into three sections on the exit side. The input side basically consists of a welding machine that unwinds the coil inserted into the payoff reel, connects it to the next coil, and a priddle roll that serves as the speed reference for the input side. In addition, depending on the type of line, there may be a cleaning section or an inlet tension leveler. In order to be able to run the line continuously, the input side is used to decelerate, stop, and accelerate the coil welding so that the line can run continuously. The side looper (or entry side loop car) usually has a priddle roll that serves as a reference for the center line speed. This central part determines the basic characteristics of the so-called processing line.The P1 galvanizing line is composed of a furnace and galvanizing equipment, and the annealing and pickling line is composed of a furnace and pickling equipment. Ru. Furthermore, depending on the line, a skin pass or tension leveler may be installed.

The exit side basically includes a exit looper (or exit loop car), a priddle roll that serves as an exit speed reference, a dividing shear for cutting the strip, and a tension reel for winding the strip. Further, depending on the line, for example, a galvanizing line may be equipped with a post-processing device, a skin pass mill, or a tension leveler.

An embodiment will be described below, taking the outlet side installation as an example.

Figure 1 shows the equipment configuration of the processing line and the speed command device.

1 is the entrance equipment and 2 is the strip that moves in the direction of the arrow. 3
is the central equipment, and 4 is the outlet equipment. 5 is a central command unit,
Reference numeral 6 denotes an entry side speed command device, which gives, for example, an entry side acceleration/deceleration command and a follow-up speed command. 8 is the sum of the central command device 5 and the input side speed command device 6, and this output becomes the speed command for the input side equipment. 7 and 9 are exit speed commands and 1
They correspond to the entry side speed command devices 6 and 8 on the person's side, respectively.

Figure 2 shows the conventional method of giving speed commands at the output equipment.

10 is an A5 Prydle roll, 12 is a 6 Prydle roll, and -13 is a 7 Prydle roll. Note that the numbers A 5 , Ji 6 , and A 7 themselves have no meaning here.

Also, although the priddle rolls are illustrated as having four rolls each, there are usually two to five rolls.

Chill 11 with a skin pass mill. By compressing the strip using a rolling down mechanism, the mechanical properties of the strip are improved, the strip surface roughness is adjusted, and the surface gloss is adjusted.

It is sometimes called an exit tension leveler on the side of a skin pass mill. In this case, the shape of the strip is adjusted, and the tension level 2 roller [IC is driven by the strip. In some cases, both a skin pass mill and an exit tension leveler are included.

14 is a differential gear, 15 is an elongation rate command device, and 6 is A5.6
The priddle roll drive motor 17 is an elongation rate motor, which drives the A6 priddle roll through the differential gear 14 by an elongation command amount higher than the A5 priddle roll.
This is to increase line speed. Arrow m in the figure indicates a speed command to a motor (not shown).

18, 19.201'll: A motor for driving each prydle roll of the A7 prydle roll. In Fig. 2, there are three rolls, but depending on the equipment, there are usually two to five rolls.

The elongation motor will be explained below.

The definition of elongation rate ε(P, U) is given by equation (1).

VD-YEnD-nE90900100. (1)vg
nt here vE: A5 priddle roll line speed (mpm) vn
:A6 priddle roll line speed (mpcrr)nE
:Ifx5 priddle roll rotation speed (rpm) no:
A6 Prime doll roll rotation speed (rpm) formula (1) = (L0g) ・nv =-”・(
2) On the other hand, based on the characteristics of the differential gear, the rotational speed nb of the expansion ratio motor 170 is determined by the following equation.

nb=(2(1+')・in jglnz・−・
(a) Here, I v : Reduction ratio of the reduction gear for A5 Pryde roll 'o : Reduction ratio formula of the reduction gear for A66 Pryde roll (3
), the rotational speed nb of the elongation motor to obtain the required elongation rate ε is determined, and the command device 15 of the elongation motor can be determined.

Furthermore, the results show that nD≧nE, that is, the A6 ply dollar roll speed is faster than the flat 5 ply dollar roll speed. (Because e≧0) Conventionally, the exit side equipment received the same speed command from the exit speed command device 9, and only the A6 pre-dol roll 12 was further accelerated by the elongation rate ε. In that case, the speed of the boiled 6-pridle roll 12 is faster than that of the A7-pridle roll 13, 9, the strip tension between the A6-7 priddle rolls decreases, and in the worst case, the strip tension becomes 0, 946-7 The strip sag between the pride rolls.

The front tension of the 6-Pride roll is O, the rear tension of the 7-Pride roll is O, the winding angle θ where each roll of the Prydle roll contacts the strip, the friction coefficient μ between the roll and the strip, As a result of this, stripping occurred between the roll and the strip, causing scratches on the strip.

(The smaller θ and μ are, the more strips occur.) Conventionally, as a countermeasure for this, for example, a touch roll is attached to the exit side roll of an A6 priddle roll and the input side roll of an A7 priddle roll to prevent the occurrence of slip. Ta. However, this was only a symptomatic treatment, and mechanically, adding a touch roll would increase equipment costs, which was not desirable.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a processing line speed command device that does not cause strip tension fluctuations.

[Embodiments of the invention]

FIG. 3 shows the speed command system of the present invention.

Reference numeral 21 is a speed command device for the priddle roll located on the side higher than the elongation motor, and 21 outputs the sum of the exit side speed command value and the command value to the elongation motor.

〔Effect of the invention〕

According to the present invention, the relative speed between the priddle rolls remains constant, and the tension is kept constant, thereby preventing sagging, stripping, or scratching of the strip.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional processing line, Figure 2 is a block diagram of a conventional processing line.
The figure is a speed command system diagram of a conventional outlet equipment, and FIG. 3 is a speed command system diagram of the present invention. 1st mouth Figure 3 Figure 2

Claims (1)

[Claims] 1. In a continuous processing line, it is necessary to drive the elongation motor via a differential gear to the prydle roll on the exit side, which is driven integrally with the prydle rolls installed before and after the skin pass mill or tension leveler. 1. A speed command device for a processing line, comprising: a device for obtaining an elongation ratio; and means for adding an elongation amount to a speed command after the elongation motor of the section to which the priddle roll belongs.