JPS5824491B2 - Processing material transport control method in catenary furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the conveyance of treated materials in a catenary furnace, and particularly to a method for controlling the conveyance of treated materials when a connecting portion of the treated materials connecting different materials passes through the furnace.

It is.

In a catenary furnace, the material to be treated is transported through the furnace in a suspended state by input and exit support rollers, and is heat-treated by heat transfer of fluid ejected from nozzles provided along the upper and lower sides of the transport line.

Therefore, 1. The amount of deflection of the treated material in the furnace is also important for preventing contact with the nozzle.

However, in order to control the amount of deflection of the processed material, there is no detector that can be used inside the high-temperature furnace, so the settings of the conveyance conditions are changed only based on the judgment of the operator.
At present, the amount of deflection is complicated, especially at joints where different materials are connected, and there is considerable error in adjusting the amount of deflection.

Therefore, the interval between the fluid ejecting nozzles that face each other with the treated material in between is set at ±400 mm or more, which is disadvantageous from the viewpoint of energy saving.

Therefore, it has been desired to reduce the nozzle spacing, that is, to accurately control the amount of deflection of the processed material.

The present invention has been made based on the above-mentioned conventional problems and demands, and its purpose is to provide a method for controlling the line conveyance of a catenary type furnace, which makes it possible to realize an inexpensive and efficient device. .

Next, the present invention will be explained with reference to the drawings, which are one embodiment.

FIG. 1 shows the transport section of a catenary furnace to which the method according to the invention is applied.

In the figure, reference numeral 1 denotes a furnace. Inside the furnace 1, a processed material 4 supported in a catenary-like manner by an inlet side support roller 2 and an outlet side support roller 3 moves from left to right in the figure.

The treated material 4 is a first treated material 4a and a second treated material 4b connected at a connecting part P, and is formed between a plurality of jet nozzles 5 provided in two rows, upper and lower, in the furnace 1. is passing through.

Further, the processing material 4 is maintained at an equal distance from each nozzle row by appropriately adjusting the tension.

Note that here, the horizontal distance between the input side support roller 2 and the output side support roller 3 is S.

, the length of the treated material 4 between them is S.

', the amount of deflection of the treated material 4 with respect to the output side support roller 3.

shall be. As shown in the figure, when the connecting portion P of two types of treated materials 4a and 4b having different plate thicknesses, plates, etc. passes through the furnace 1,
If the tension T of the treated material 4 is not controlled according to the penetration distance S of the connection part P into the furnace 1, the catenary shape represented by the deflection amount Do, that is, the distance between the treated material 4 and the jet nozzle 5 will always be maintained. cannot be kept constant.

That is, as shown in curve 6 in FIG. 2, the first and second treated materials 4 are
Required tension T1 for a, 4b alone. It is necessary to change the time between T2 along a high-order function curve.

However, such control is complicated and wasteful.

Therefore, the present invention does not use the above-mentioned high-order functions, but instead calculates the tension at the connection portion in response to the tension T obtained by the following equation modified by a correction value that can be calculated using a low-order functional equation that is easy to calculate. The objective is to control the amount of water passing through the furnace.

T=Tt+(T2Tt) ・(S/So)+(T2
Tl )Y...(1) Here, T=tXwXσ (kg) 11 T 2 = t 2 X W2 Xσ (kg)
t,・T2: First and second treated materials 4a and 4 face plate thickness W1°W2: Board width σ: Conveyance conditions (unit tension kg/ma) S/S
o: Correction value based on the degree of penetration of the connection point, Y: Correction value based on the plate thickness, plate width, unit tension, and S/So of each treated material.

The following is used as a specific example of calculating this correction value.

S: Penetration length of the connection point into the furnace.

Soz catenary span.

And XE is a value related to the reversal position of the tension T with respect to the base line, and is determined by the coordinates (0, T1) in FIG.

(1, T2 is the horizontal axis coordinate of the intersection of the base line 7 and the curve 6, which are connected by X.

It is.

And here, tl, t22w29w2. H2So1
is a value that can be set or measured before the two types of old and new materials are connected, and S can be measured with a pulse counter or the like.

Therefore, the correction values S/S o', Y can be easily calculated.

If it is necessary to maintain a more accurate inter-nozzle distance, it goes without saying that the formula for calculating the correction value Y may be a higher-order power function.

As is clear from the above explanation, according to the present invention, in order to keep the catenary curve of the treated material in the furnace constant, it is not necessary to directly detect the amount of deflection of the treated material in the furnace, and the shape of the treated material is The tension may be controlled based on a mathematical expression expressed as a function of the movement distance and the like.

Therefore, the conveyance conditions for different materials to be treated can be easily set and can be controlled by a microcomputer, making it possible to improve production size, quality, and save labor at low equipment costs.

Furthermore, by keeping the catenary curve constant, the interval between the fluid jet nozzles can be shortened (±200+m or less), which has the effect of saving fuel costs.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the conveyance section of a catenary furnace to which the method of the present invention is applied, and Fig. 2 shows the intrusion of the joint between two different types of treated materials during their passage through the furnace. Fig. 3 shows a curve diagram of the change in tension of the treated material with respect to the temperature. 1...furnace, 4...processing material, 4a,
4b...First and second treated materials, T...Tension, S/So'...Degree of penetration, Do...
amount of deflection.

Claims (1)

[Claims] 1. In a catenary furnace, when passing a joint of different materials into the furnace, correction values based on the plate thickness, plate width and unit tension of the two types of treated materials, old and new, and the connection The catenary is characterized in that the tension is controlled in accordance with the tension corrected by the correction value based on the degree of penetration into the furnace of the catenary. A method for controlling the conveyance of processed materials in a mold furnace.