CN106282531B - Automatic control method for high-position steel tapping of walking beam furnace - Google Patents

Abstract

The invention relates to an automatic control method for high-level tapping of a walking heating furnace. When the laser detector at the discharge end detects that the slab reaches the tapping position, the length of the slab set at the second level is compared with the set value. Walking beam automatic high-level tapping within the set range; walking heating furnace high-level tapping automatic control method can effectively avoid accidents such as slab falling caused by the bending of the slab hitting the furnace wall during the tapping process of the tapping machine. After the implementation, the production efficiency is effectively improved, the operator's manual operation time is reduced, and accidents caused by untimely manual operation are avoided. It effectively reduces energy consumption, stabilizes the temperature field, reduces burning loss, effectively improves the stability of furnace pressure, and avoids rapid changes in furnace pressure due to heat exchange when the furnace door is opened.

Description

An automatic control method for high-position tapping in a walking heating furnace

technical field

The invention relates to the field of automatic control of heating furnaces, in particular to an automatic control method for high-position tapping of a walking heating furnace.

Background technique

When the loading conditions of the walking heating furnace are met, the charging furnace door is automatically opened, and the steel loading machine loads it into the fixed beam in the heating furnace. The steel slabs put into the furnace pass through the positive circulation of the walking beam in the furnace according to the requirements of the production rhythm, and the slabs pass through each section of the furnace in turn. When the steel is tapped, the walking beam stops moving, and the electric control system simultaneously measures and calculates the position of the slab waiting to be tapped. After the heating furnace receives the signal from the rolling line, the discharge furnace door is automatically opened, and the hot slab is lifted out by the slab tapping machine and placed on the discharge roller table outside the furnace.

The slab bends in the furnace due to high temperature (see Figure 1), especially when the rolling line accident is long or the heating furnace uses coke oven gas, the bending in the slab furnace is serious, forming a large cantilever, and the operator can only move the step The feeding beam is manually raised to a high position to avoid accidents such as slab falling and other accidents caused by the bending of the slab hitting the furnace wall during the tapping process of the tapping machine. At present, the main problems in normal production are slabs with a length of 10500-10900mm. The operator needs to manually operate the walking beam to rise and fall every time during the tapping process. The ascent and descent of the walking beam requires that the loading and unloading furnace doors are all closed, or that the loading and unloading machine is in the lower or rear position. Therefore, the operator needs to make timely and accurate judgments, and the walking beam must be manually raised to the upper position before the tapping machine is started. Once the walking beam is not raised during tapping, it may hit the slab and cause the slab to tilt in a large area, or hit the furnace door fire retaining wall during the tapping process, resulting in a slab drop accident.

Contents of the invention

The technical problem to be solved by the present invention is to provide an automatic control method for high-position tapping of a walking heating furnace. When the slab set according to the requirements is released from the furnace, the walking beam can be automatically raised, and when the tapping is completed, the walking beam can be automatically controlled in a normal cycle, shortening the tapping time and reducing accidents.

To achieve the above object, the present invention adopts the following technical solutions:

An automatic control method for high-position steel tapping of a walking heating furnace. When the laser detector at the discharge end detects that the slab has reached the position of the furnace, the length of the slab set in the second stage is compared with the set value. Within the range, the walking beam automatically taps steel at high position; the specific steps are as follows:

1) Furnace loading, the steel loading machine automatically loads steel;

2) The walking beam advances automatically according to the required temperature of the slab;

3) The laser detector at the discharge end detects that the slab is in place;

4) Determine whether the slab length is within the set slab length value range;

5) If the length of the detected slab is within the range of the set value, the walking beam automatically rises to the upper position; if the length of the detected slab is not within the range of the set value, the walking beam stops moving and remains at the origin of the firing position, that is, the back position and the lower position;

6) The heating furnace receives the steel request signal from the rolling line, and the tapping machine automatically taps steel;

7) Send out a tapping completion signal;

8) If the walking beam is in the upper position, it will automatically descend to the lower position and then cycle automatically, repeat step 2; if the walking beam is in the lower position, it will automatically cycle directly and repeat step 2.

Compared with prior art, the beneficial effect of the present invention is:

1. The automatic control method for high-level tapping of the walking heating furnace can effectively avoid accidents such as slab falling caused by the bending of the slab colliding with the furnace wall during the tapping process of the tapping machine. After the implementation, the production efficiency is effectively improved, the operator's manual operation time is reduced, and accidents caused by untimely manual operation are avoided.

2. It effectively reduces energy consumption, stabilizes the temperature field, reduces burning loss, effectively improves the stability of furnace pressure, and avoids rapid changes in furnace pressure due to heat exchange when the furnace door is opened.

Description of drawings

Figure 1 is a schematic diagram of a slab producing a suspension beam in a furnace.

Fig. 2 is a flow chart of the automatic control of the high-position tapping of the walking heating furnace of the present invention.

In the figure: 1-slab 2-walking beam 3-cantilever

Detailed ways

The specific embodiment of the present invention is further described below:

Example 1

The length of the slab is 10800mm, and when the length of the slab is set to be 10500-10900mm in the second stage, the steel is tapped at the high position of the walking heating furnace.

As shown in Figure 2, an automatic control method for high-level tapping of a walking heating furnace. When the laser detector at the discharge end detects that the slab has reached the position of the furnace, it is compared with the set value of 10500-10900mm. Within the range, the walking beam automatically taps steel at high position; the specific steps are as follows:

1) Furnace loading, the steel loading machine automatically loads steel;

2) The walking beam advances automatically according to the required temperature of the slab;

3) The laser detector at the discharge end detects that the slab is in place;

4) Determine whether the length of the slab is within the range of 10500-10900mm;

5) The length of the detected slab is 10800mm, and the walking beam automatically rises 100mm to the upper position of the walking beam within the range of 10500-10900mm;

6) The heating furnace receives the steel request signal from the rolling line, and the tapping machine automatically taps steel;

7) Send out a tapping completion signal;

8) The walking beam automatically descends to the lower position and then circulates automatically, repeating step 2.

Example 2

The length of the slab is 10000mm, and when the length of the slab is set to be 10500-10900mm in the second stage, the steel is tapped at the high position of the walking heating furnace.

As shown in Figure 2, an automatic control method for high-level tapping of a walking heating furnace. When the laser detector at the discharge end detects that the slab has reached the position of the furnace, it is compared with the set value of 10500-10900mm. Within the range, the walking beam automatically taps steel at high position; the specific steps are as follows:

1) Furnace loading, the steel loading machine automatically loads steel;

2) The walking beam advances automatically according to the required temperature of the slab;

3) The laser detector at the discharge end detects that the slab is in place;

4) Determine whether the length of the slab is within the range of 10500-10900mm;

5) The length of the detected slab is 10000mm, and if it is not within the range of 10500-10900mm, the walking beam stops moving and keeps at the origin of the firing position, that is, the rear position and the lower position;

6) The heating furnace receives the steel request signal from the rolling line, and the tapping machine automatically taps steel;

7) Send out a tapping completion signal;

8) The walking beam automatically circulates and repeats step 2.

The above is only the basic principle of the present invention, and does not limit the present invention in any way. All equivalent changes and modifications according to the present invention are within the scope of the technical protection scheme of this patent.

Claims (1)

1. A method for automatic control of high-position steel tapping in a walking heating furnace, characterized in that, when the laser detector at the discharge end detects that the slab reaches the position of the furnace, the length of the slab set at the second level is compared with the set value. In comparison, if the walking beam automatically taps steel at a high position within the set range; the second-level set slab length is 10500-10900mm, and the specific steps are as follows: 1) Furnace loading, the steel loading machine automatically loads steel; 2) The walking beam advances automatically according to the required temperature of the slab; 3) The laser detector at the discharge end detects that the slab is in place; 4) Determine whether the slab length is within the set slab length value range; 5) If the length of the detected slab is within the range of the set value, the walking beam automatically rises to the upper position; if the length of the detected slab is not within the range of the set value, the walking beam stops moving and remains at the origin of the firing position, that is, the back position and the lower position; 6) The heating furnace receives the steel request signal from the rolling line, and the tapping machine automatically taps steel; 7) Send out a tapping completion signal; 8) If the walking beam is in the upper position, it will automatically descend to the lower position and then cycle automatically, repeat step 2; if the walking beam is in the lower position, it will automatically cycle directly and repeat step 2.