KR200301049Y1 - An apparatus for controlling an entering position of a billet - Google Patents

Abstract

The present invention prevents meandering of the working beam according to the length of the material and arranges it in a proper position so as to uniformly distribute the temperature in the furnace, while allowing the material to be smoothly extracted without damaging the refractory of the working beam in the furnace. A charging position control apparatus for a billet charging material. The charging position control apparatus for a billet charging material according to the present invention detects a length of a billet conveyed toward a wire heating furnace, and the detected length causes a specific problem. If it is within the range (for example, 8100 to 9200mm), load it at the position moved further by the beam distance / 2 in the + or-direction from the center of the wire heating furnace, and load it so as to be located at the center of the wire heating furnace as in the prior art. In order to detect the reference point for charging position control and to detect the length, multiple photo sensors and laser sensors are installed in the billet transfer path. Programmable Logic Controller (PLC) is provided as a control means for controlling the motor control panel which receives the output signal of the sensor and drives the roller table driving motor.

Description

Charging position control device of billet charging material {AN APPARATUS FOR CONTROLLING AN ENTERING POSITION OF A BILLET}

The present invention relates to a device for controlling the charging position by measuring the length of the material before the material is charged into the furnace, more specifically, to prevent meandering of the working beam according to the length of the material and to evenly distribute the temperature in the furnace. It relates to a charging position control device for a billet charging material to be arranged in an appropriate position so that the extraction of the material smoothly without damaging the refractory of the working beam in the furnace.

Dividing the process into three main furnaces, the charging process to put in the proper position of the furnace according to the length of the material and the heating process to heat up the material to reach the extraction target temperature, and the post-processing of the finished material It can be divided into the extraction process sent to the phosphorus compaction line, the present invention relates to the charging process in the heating beam (WALKING BEAM) billet material heating furnace.

In general, the working beam type heating furnace is provided with a fixed beam and a moving beam alternately installed to support and move the material, these beams support and move the material until the material is charged into the heating furnace and extracted. . Such a walking beam is provided with a moving beam for moving a charged material by a predetermined distance from a charging side to an extraction side, and a non-movable fixed beam is alternately spaced a predetermined distance. If the loading position of a material is incorrect in a heating furnace, The refractory material of the working beam is damaged by the charged material, which makes it impossible to operate by heating, or there is a risk of an accident that the extraction of the material becomes impossible. In other words, when the material is charged into the working beam type furnace, the temperature distribution in the furnace should be taken into consideration so that the heating of the material can be performed uniformly while preventing the meandering of the center of gravity of the working beam in one direction. do.

Considering these conditions, there are two methods for charging materials in a heating furnace: a zigzag shape in which materials are arranged in a zigzag shape, and a center charging type in the center.

Conventional center-mounted charging positioning device detects the length of the billet that is transferred to the charging inlet of the heating furnace using a length detection sensor (for example, a laser sensor), and then the motor of the transfer table according to the length Was controlled so that the billet was located at the center of the furnace.

However, the conventional apparatus for determining the position of the billet so as to be centered in the working beam type heating furnace has a problem that a large-scale equipment accident may be caused for the billet having a specific length as shown in FIG. That is, the distance between the walking beams 51 is constant at 1100 mm, and when it is extracted through the heating furnace when it is charged too far from the walking beam supported by the end as shown in FIG. As shown in (c), the end is bent due to the high temperature of the heating furnace, making extraction impossible or transporting, or an accident that the roll is broken in a later process, and as shown in (c), the working beam 51 If it is placed directly on), the warp does not occur, but the refractory of the working beam is damaged and a large equipment accident occurs such that the pipe inside the beam is directly exposed to high temperature and bursts. If the end is charged so close to the last working beam 51 supporting the billet, it will bend as shown in (e) during extraction, and if the warpage is severe, it will be impossible to extract and the billet will be By the end of the beam Touch the causes of accidents, such as refractories plant damage, shutdown.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, the purpose of which is to install the charging billet on the basis of the distance between the support beam and the billet end when determining the charging position by the center charging type It is to provide a charging position control device for a billet charging material that can prevent the occurrence of equipment accidents or problems that cannot be extracted by determining the charging position by dividing the two types that can cause an accident.

1 is a block diagram showing a charging position control device for a billet charging material according to the present invention.

Figure 2 is a flow chart showing the operation procedure of the charging position control device of the billet charging material according to the present invention.

3 is a schematic diagram showing an example of the charging position calculation and the speed control of the roller table in the charging position control apparatus for the billet charging material according to the present invention.

Figure 4 is a schematic diagram showing the charging pattern for each length of the billet charging material according to the present invention.

5 is to show the problems caused by the conventional centering method, (a), (c), (d) is a billet state at the time of charging, (b), (e) is a billet state at the time of extraction It is a schematic diagram shown.

* Description of the symbols for the main parts of the drawings *

100: laser sensor 200: front photo sensor

300: rear photo sensor 400: charging door sensor

500: Internal photo sensor

600: PLC (Programmable Logic Controller)

700: motor control panel

As a constitutional means for achieving the above object of the present invention, the present invention is a charging roller table for transferring the billet to the wire heating furnace, and the inner roller table connected in line with the charging roller table and located in the wire heating furnace And a charging position control device for a billet charging material applied to a charging facility comprising a driving motor of the charging roller table and the inner roller table.

A laser sensor for detecting a length of the billet which is installed and conveyed at a predetermined position on the charging roller table;

A front photo sensor installed between the laser sensor and the wire heating furnace to set the reference of the deceleration start point;

A rear photo sensor installed between the front photo sensor and the wire heating furnace to set a reference for measuring the transfer distance;

A pulse generator which detects the rotational speed of the drive motor of the roller table and outputs it as a pulse signal;

A communication manager which receives the length measurement value from the laser sensor and applies it to a memory;

An input / output control unit for controlling input and output of signals from the front photo sensor, the rear photo sensor, and a pulse generator;

A memory for storing the length value of the billet detected by the laser sensor inputted through the communication manager;

When the billet length stored in the memory is read in and the end is located at the front and rear predetermined distances of the arbitrary walking beams when the center is loaded, it is to be positioned before and after the beam spacing / 2 from the center of the wire heating furnace. In case of length, the transport distance based on the rear photo sensor is calculated to be located at the center of the wire heating furnace, and the billet is transported at low speed according to the operation state of the front photo sensor and the rear photo sensor. A microprocessor for controlling the motor control panel to be transported;

And a motor control panel for controlling the operation of the roller table driving motor at a speed according to the instruction of the microprocessor.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the charging position control device of the billet charging material according to the present invention, prior to this, the operation concept of the charging position control device of the billet charging material according to the present invention This will be briefly described with reference to FIG.

In general, the working beam type heating furnace is provided with a fixed beam (F) and a moving beam (M) are alternately installed at intervals of 1100mm. Billets having a length in the range of 7000 mm to 8100 mm and billets having a length in the range of 9200 mm to 10300 mm, as shown in (a) and (d), shall have support beams (i.e., supporting the billet and having the It is located at a position away from the nearest fixed beam (F) or the moving beam (M) from 200mm to less than 750mm. In this case, warping does not occur at the tip of the billet having a predetermined thickness. However, in the billet having a length in the range of 8100 mm to 9200 mm, as shown in Fig. 4B, both ends are separated by more than 750 mm or less than 200 mm from the support beam. At this time, a problem as shown in FIG. 4 occurs. That is, the billets 41 whose ends are separated by more than 750 mm from the supporting beam but do not touch the side beams are in a state as shown in Fig. 5B, and the tip thereof is as shown in Fig. 5C. As described above, the billets 42 that break the refractory of the beam cause damage to the inner pipe of the beam and cause equipment failure. The tip of the billets 42 is 200 mm from the beam supported as shown in FIG. The billets 43, which are separated by less than about the billet, as shown in FIG.

Therefore, the charging position control device for the billet charging material according to the present invention, as shown in (b) of Fig. 4, the billings whose ends are positioned between about 350 mm before and 200 mm after any beam are obtained by the center charging method. It is intended to prevent equipment accidents by moving one half of the beam spacing (i.e., 1100/2 = 550mm) from the position to the left or the right. In other words, the billets of the length which may cause a problem are adjusted so that the tip is located in the safe area (ie, 200 mm to 750 mm).

The charging position control apparatus according to the present invention configured as described above, as shown in Figure 1, the wire rod heating furnace 1, and the billet supply table for supplying the billet to be charged in the wire rod heating furnace (2) ), A feed roller table 3 receiving the billet from the billet supply table 2, and a feed roller connected to the feed roller table 3 to charge the billet into the wire rod 1 Table 4, the charging door 5 which is an entrance into which the billet conveyed to the charging roller table 4 is charged into the heating furnace, the inner roller table 6, the charging roller table 4 and the inside of the furnace In a charging facility consisting of a motor 7 for driving a roller table 6 and a pulse generator 8 for detecting the rotational speed of the motor 7, it is provided at a predetermined position on the loading roller table 4. Laser sensor 100 for detecting the length of the billet to be transferred, and the laser sensor 100 and It is installed between the reheating furnace (1) and the front photo sensor 200, which is the starting point of the charging roller table (4), and between the front photo sensor 200 and the wire rod heating furnace (1) to determine the charging position Minimum inner wall proximity distance for protecting the rear photo sensor 300, the charging door sensor 400 to detect the opening and closing of the charging door 5, and the inner wall 1a of the wire heating furnace 1 as a reference. Is connected to the internal photo sensor 500 and the communication management unit 601 and the photosensors 200 to 500 and the pulse generator 8 connected to the output terminal of the laser sensor 100 to control the signal input and output The memory 603 for storing billet length measurement values inputted through the input / output controller 602 and the communication manager 601 and the photosensors 200 to 500 inputted through the input / output controller 602. Therefore, the charging position is calculated according to the length of the charging billet stored in the memory 603. PLC 600 consisting of a microprocessor 604 for controlling the motor control panel 700 by comparing the calculated charge position and the pulse counting value output from the pulse generator 8 and under the control of the PLC 600 It consists of the motor control panel 700 which controls the charging roller table 4 and the motor 7 which drives the internal roller table 6.

The operation flow of the charging position control apparatus of the billet charging material shown in FIG. 1 is shown in FIG. 2, and an example of the position control is shown in FIG. With reference to this will be described the operation of the device according to the present invention.

When the billet is supplied from the billet supply table 2 to the billet supply table 3, the billet supply roller table 3 is driven to transport the billet to the charging roller table 4 side. At this time, the laser beam sensor 100 detects the conveyed billet and measures the length. The billet measurement length L measured by the laser sensor 100 is stored in the memory 603 through the communication management unit 601 of the PLC 600 (S21).

In this way, when the length value of the billet to be charged is input, the microprocessor 604 reads the length value L of the charge billet stored in the memory 603 to cause a problem. It is determined whether it belongs to -9200mm (S22). In the above, the charging position calculation formula differs depending on whether or not the received billet length L falls within 8100 mm to 9200 mm.

That is, as shown in FIG. 3, the distance from the rear photo sensor 300 to the center of the wire rod 1 is referred to as D, and the transport distance based on the rear photo sensor 300 corresponding to the charging position is referred to. When T, in the above judgment, if the received billet length L does not belong to 8100mm to 9200mm, the charging position is calculated by T = DL / 2 by the center charging method (S23), on the contrary, When the length L of the charging billet belongs to a length which may cause a problem, that is, 8100 mm to 9200 mm, the transfer distance corresponding to the charging position is calculated as T = DL / 2 + -550 (S24). The reason why the center loading position is ± 550mm in the above is to uniformize the temperature distribution in the wire heating furnace 1 and to prevent the center of gravity of the working beam from deviating to one side. Alternately (left).

Then, the calculated transfer distance T is converted into a pulse counting value by the pulse generator 8, for example, when the pulse period is 2ms and the feeding speed is 0.5m / s, the number of pulses ( P) Is calculated.

As such, when the pulse number P corresponding to the feeding distance from the rear photo sensor 300 to the set charging position in the wire heating furnace 1 is calculated, the microprocessor 604 sends a control signal to the motor control panel 100. Is applied to cause the motor 8 to drive the charging roller table 4 and the inner roller table 6 (S25), so that the billets waiting on the charging roller table 4 are transferred to the wire rod heating side, The charging door 6 is opened at the same time as the transfer start (S26). Then, the billet is advanced at a high speed (for example, 1.5 m / s) to the inner roller table 6 in the wire rod furnace 1 through the opened charging door 6 (S27).

As described above, by moving the billet from the charging roller table 4 to the inner roller table 6 at a high speed, the end of the billet is transferred through the front photo sensor 200, and the front photo sensor ( When 200 is turned off (S28), the microprocessor 604 controls the motor control panel 700 to decelerate the speed of the roller tables 4 and 6 (S29). That is, after passing through the front photo sensor 200, the billet, which was transferred at a high speed (for example, 1.5 m / s) for a rapid progress, is decelerated at a low speed (0.5 m / s) for accurate position control.

When the end of the charging billet 10, which is transported at a low speed (0.5m / s) is passed through the rear photo sensor 300, which is the reference point of the calculation of the transfer distance, the rear photo sensor 300 is turned off (S30). From this time, the down counting starts from the calculated pulse number P using the output signal of the pulse generator 8 which detects the rotational speed of the motor 7 and outputs it as a pulse as a trigger signal (S31). . That is, the conveying distance of the billet is detected from the rear photo sensor 300.

In the above, the end of the charged billet 11 is separated from the furnace inner wall 1a by more than a predetermined distance (α in Fig. 3), the internal photo sensor 500 is turned off (S32), and the down counting value is 0. When (S3), the billet charged in the wire heating furnace (1) has reached the set charging position, the roller table stop signal is output to the motor control panel 700 to stop the motor (7), and then charging The billet supply table 3 is driven to receive the billet to be supplied. In the above, the billet 11 charged at the predetermined charging position (Fig. 4 (a), (c), (d)) in the wire heating furnace 1 is extracted on the extraction side (arrow direction) by the moving beam 1b or the like. Heated while being transferred to).

In this way, when the charging of the billet into the wire rod heating furnace is made, the supply roller table 3 is driven to transfer the next billet to the charging roller table 4 side, and the billet is charged to the charging roller table 4. Each time it is transported, the charging position control device according to the present invention repeats the processes (S21 to S34) and charges each to a stable charging position.

As described above, the charging position control device according to the present invention, when the billet material is located in the center of the furnace by the center charging method, the beam spacing in the center for the billet material belonging to a specific range causing equipment accidents By moving it to the left and right by 2, the loading position of the material in the furnace is wrong and the refractory of the beam is broken, which causes the internal pipe of the beam to be broken and the furnace operation is stopped or the heated billet material is bent. This prevents problems such as impossible, and prevents meandering of the inner working beam so that the temperature distribution in the furnace is uniform, thereby making it possible to ensure that the charged billet material is uniformly heated.

In particular, by preventing a large equipment accident in the heating furnace, there is an excellent effect to increase the production efficiency and stability.

Claims (4)

A charging roller table 4 to which the billet is transferred to the wire heating furnace 1, a furnace roller table 6 connected in line with the charging roller table 4 and positioned in the wire heating furnace 1; In the charging position control device for the billet charging material applied to the charging equipment consisting of the drive motor 7 of the charging roller table 4 and the inner roller table 6, A laser sensor 100 for detecting a length of the billet which is installed and conveyed at a predetermined position on the charging roller table 4; A front photo sensor 200 installed between the laser sensor 100 and the wire heating furnace 1 to set a reference of a deceleration start point; A rear photo sensor 300 installed between the front photo sensor 200 and the wire heating furnace 1 to set a reference of a transport distance measurement; A pulse generator 8 which detects the number of rotations of the drive motor 7 of the roller tables 4 and 6 and outputs it as a pulse signal; A communication manager 601 receiving the length measurement value from the laser sensor 100 and applying it to a memory; An input / output controller 602 for controlling input and output of signals from the front photo sensor 200, the rear photo sensor 300, and the pulse generator 8; A memory 603 for storing a length value of the billet detected by the laser sensor 100 inputted through the communication manager 601; When the billet length stored in the memory 603 is read and the end is located at the front and rear predetermined distance of the arbitrary walking beam when the center is loaded, before the beam interval / 2 from the center of the wire heating furnace 1, In order to be located later, in the case of other lengths, the transfer distance based on the rear photo sensor 300 is calculated to be located at the center of the wire heating furnace 1, and the front photo sensor 200 and the rear photo sensor 300 are located. A microprocessor 604 for controlling the motor control panel 700 to be conveyed by the calculated conveying distance while conveying the billet at a low speed according to the operating state of And a motor control panel (700) for controlling the operation of the roller table driving motor (7) at a speed according to the instructions of the microprocessor (604). 2. The microprocessor of claim 1, wherein the microprocessor 604 is Center-load the billets other than 8100 ~ 9200mm, and insert the billets within 8100mm ~ 9200mm by moving them from the center position of wire rod heating furnace (1) to the position where + beam interval / 2 or -beam interval / 2 is added alternately. A charging position control device for a billet charging material, characterized in that it is to be made. 2. The microprocessor of claim 1, wherein the microprocessor 604 is When the billet length is received from the laser sensor 100 while advancing the billet to the wire rod furnace 1 by driving the charging roller table 4 at high speed, it is compared whether the received length is within 8100 to 9200mm, If it does not belong to 8100 ~ 9200mm, (Here, T is the distance from the rear photo sensor 300 to the end of the billet to be center-loaded, D is the distance from the rear photo sensor 300 to the center of the wire rod heating furnace 1, L is the distance of the received billet Length), and when it belongs to 8100 to 9200, the transfer distance is calculated as T = DL / 2 + -550, and then the calculated transfer distance T is converted into the number of pulses P, When the end of the billet to be passed passes through the front photo sensor 200, the feed speed of the charging roller table (4) is decelerated at a predetermined speed, the end of the billet conveyed at the reduced speed is the rear photo sensor 300 When passing, down counting is started from the calculated number of pulses P using a pulse signal applied from the pulse generator 8 as a clock signal, A charging position control device for a billet charging material, characterized in that the charging roller table (4) is stopped when the down counting value becomes zero. According to claim 1, wherein the charging position control device of the billet charging material It is further provided with an internal photo sensor 500 for detecting the billet at the limit position for protecting the inner wall in the wire furnace (1), The microprocessor 604 is a billet characterized in that the roller table driving motor 7 is controlled so as not to stop until the internal photo sensor 500 is turned off after the billet is charged into the wire rod furnace 1. Device for controlling the charging position of the charging material.