JP2575257B2 - Method and apparatus for extracting material to be processed from continuous heating furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for extracting a material to be treated in a continuous heating furnace, and more particularly to a method and an apparatus for extracting a material to be treated in a walking beam furnace.

[0002]

2. Description of the Related Art A hearth is divided into a moving hearth and a fixed hearth, and the moving hearth is hydraulically, electrically driven or a combination thereof.
2. Description of the Related Art A walking beam type continuous furnace that transports a heated material by repeating a rectangular movement of ascending → forward → falling → retreat is known. Walking beam furnaces have recently been widely used in mass production furnaces due to factors such as an increase in heating capacity, a reduction in scratches, and the ease of empty furnaces during furnace repair.

In a walking beam furnace, for example, a slab transported on a table is pushed in by a pusher on the loading side and transported while being heated to an extraction end by a walking beam. The slab conveyed to the extraction end is detected by the extraction normal γ-ray sensor, receives an extraction standby command, and waits for extraction on the fixed hearth. An emergency γ-ray sensor is provided on the extraction door side at a predetermined interval from the service γ-ray sensor, and is usually used when the service γ-ray sensor fails.

[0004]

SUMMARY OF THE INVENTION It is structurally impossible to control the position of a slab charged in a continuous heating furnace in the furnace. On the other hand, the slab is heated to the extraction target temperature, but the width is expanded due to thermal expansion, and the extraction slab and the subsequent slab are welded to each other, which may cause an accident. The present invention provides a method and an apparatus for extracting a slab that detects welding of the slab on the extraction side of the continuous heating furnace and prevents the slab from falling from the extractor in the operation of the heating furnace.

[0005]

According to the present invention, there is provided a conventional sensor for detecting an end face in the width direction end of a slab at a stop position of a transfer end of the slab in the furnace on a side of an extraction door in the furnace of a continuous heating furnace for a slab, On the extraction side from the in-furnace transport end stop position, an emergency sensor is provided that sets a position having an interval equal to the control compensation value α to the slab width direction end face detection position, and the slab from the extractor slab in-furnace transport end stop position is provided. A monitoring stroke in which the control compensation value α is added to the width of each extracted slab is provided in the pouring stroke, and the front end face in the width direction is detected by the common sensor, and the slab whose conveyance is stopped is extracted. The movement amount is measured in the process of extracting with the tractor, and when the measured value matches the monitoring stroke, a width direction front end face detection signal of the extracted slab from the emergency sensor is input. The extraction method of the slab continuous heating furnace is characterized in that the extraction operation of the extractor is continued when the operation is performed, and the extraction operation of the extractor is stopped when no input is made.

The present invention further provides a conventional sensor for detecting an end face in the width direction of the slab at the stop position of the slab transfer end on the side of the extraction door in the furnace of the continuous slab heating furnace, and a transfer end sensor in the furnace. An emergency sensor is provided with a position having an interval equal to the control compensation value α on the extraction side from the stop position as the width direction end face detection position of the slab, and within the slab extraction stroke from the slab furnace transfer end stop position of the extractor,
A monitoring stroke in which the control compensation value α is added to the width of each extracted slab is provided, and the slab whose conveyance is stopped by detecting the front end face in the width direction by the common sensor is extracted by an extractor. Measure the amount of movement, and when the measured value coincides with the monitoring stroke, the extraction operation of the extractor is continued when the width direction front end face detection signal of the extracted slab from the emergency sensor is input,
An extraction apparatus for a continuous slab heating furnace, comprising a control system for stopping an extraction operation of an extractor when no input is made.

The present invention will be described below with reference to the drawings. FIG.
FIG. 2 is an explanatory diagram of the present invention. In the figure, a heating furnace 10 incorporates a fixed hearth 12 and a movable hearth (not shown), and is provided with an extraction door 11. The extraction port table 14 is provided at right angles to the slab conveyance direction of the heating furnace 10 and the extractor 1
3 is disposed near the extraction port table 14. The extractor 13 extracts the slab 20 of the heating furnace 10, centers the slab 20 on the extraction port table 14, and places it on the extraction port table 14. Thus, the extractor 13 is given a certain forward and backward stroke.

In the present invention, a monitoring stroke of the extracted slab width plus the control correction value α is given to the extractor in advance. Here, the control correction value α is an interval between a later-described normal sensor and an emergency sensor.

In the furnace of the heating furnace 10, an emergency sensor 16 and regular sensors 15-1 and 15-2 are arranged at predetermined intervals near the extraction port. The sensor may be a known γ-ray sensor. In the present invention, the extractor usually goes to extract the slab with the γ-ray sensor turned on, and centers it on the mill line of the extraction port table. That is, the extraction slab is normally detected by the γ-ray sensor, placed on the fixed hearth from the movable hearth, the extraction door is half-opened and lifted by the extraction start command, and the extractor advances to below the extraction slab according to the extraction stroke amount (see FIG. 2). In accordance with the computer lift command, the extraction door is fully opened, and the extractor rises and lifts the slab. Upon completion of the ascent of the extractor, the extractor starts retreating according to the retraction stroke (FIG. 3).

The monitoring set value (monitoring stroke) of the moving distance at the time of the backward stroke is the extracted slab width plus the control correction value α as described above. Check the distance of the extractor every 50mm / sec when the retractor starts to retract. That is, the amount of slab movement in the furnace at the start of extraction is monitored by an emergency γ-ray sensor. Automatically determines the welding with the succeeding slab or the skew of the extraction slab, forcibly stops the extraction control sequence of the extractor, and prevents the slab from falling. When it is OFF, normal extraction control is continued. In the present invention, the interval α between the common γ-ray sensor 15 and the emergency γ-ray sensor 16 is
And the monitored stroke amount when the extractor is retracted is the extracted slab width W + the interval α.

[0011] As shown in FIG.
The emergency γ-ray sensor 16 conducts with the control panel, and the detection signal is input to the computer 18. The computer 18 has a γ-ray check timing system, an emergency γ-ray ON / OFF system, and an extractor forced stop system.

Accordingly, YES in the γ-ray check timing system
The extractor forced stop signal is output by the signal and the emergency γ-ray ON signal. As described above, the suspension of the extractor control by the extractor forced stop signal is caused by welding of the extraction slab and the succeeding slab or skew of the extraction slab, so that it is easy to visually confirm this.

If the welding of the extraction slab and the succeeding slab can be visually observed, the welding state can be eliminated by a fine vertical movement of the extractor (not shown) or a vertical movement of the walking beam. The skew of the extracted slab is corrected to a normal posture by handling.

[0014]

According to the present invention, the arrangement distance between the emergency sensor and the regular sensor is added to the width of the extracted slab as the control correction value α, and the monitored stroke amount when the extractor is retracted is used. Can be reliably captured and the slab can be prevented from falling.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part of the present invention.

FIG. 2 is an explanatory diagram of the operation of the present invention.

FIG. 3 is an explanatory diagram of another operation of the present invention.

FIG. 4 is an explanatory view of the device of the present invention.

[Explanation of symbols]

 Reference Signs List 10 heating furnace 15 regular γ-ray sensor 16 emergency γ-ray sensor 20 extraction slab

Claims (2)

(57) [Claims] 1. A common sensor for detecting an end face in the width direction of a slab at a stop position in a furnace at a transfer end in a furnace on a side of an extraction door in a furnace of a continuous heating furnace for a slab; In addition to providing an emergency sensor with a position having an interval equal to the control compensation value α on the extraction side as the width direction end face detection position of the slab, and within the slab pouring stroke from the slab furnace transfer end stop position of the extractor, A monitoring stroke obtained by adding the control compensation value α to the width of each extracted slab is provided, the front end face in the width direction is detected by the common sensor, and the slab whose conveyance has been stopped is extracted by the extractor in the process. The movement amount is measured, and when the measured value matches the monitoring stroke, the width direction front end face detection signal of the extracted slab from the emergency sensor is input and the extractor is detected. Allowed to continue the extraction operation, the extraction method of the continuous heating furnace slab, characterized in that allowed to stop the operation of extracting the extractor when not input. 2. A conventional sensor for detecting an end face in the width direction of the slab at a stop position of the slab at the transfer end in the furnace of the continuous heating furnace of the slab, and a stop position of the transfer end in the furnace. On the extraction side, an emergency sensor is provided to detect a position with an interval equal to the control compensation value α on the slab width direction end face detection position, and each extraction is performed within the slab extraction stroke from the slab furnace transfer end stop position of the extractor. A monitoring stroke in which the control compensation value α is added to the width of each slab is provided, and the amount of movement in the process of extracting the slab whose conveyance has been stopped by detecting the front end face in the width direction with the common sensor and extracting the slab with the extractor is described. And the extractor detects that the width direction front end face detection signal of the extraction slab from the emergency sensor is input at the time when the measured value matches the monitoring stroke. Extracting operation was allowed to continue, a continuous heating furnace of the extractor slab, characterized in that a control system allowed to stop the operation of extracting the extractor when not input.