JPH04294814A - Controller of roller table of slab edge heater - Google Patents

Abstract

PURPOSE:To elevate the transfer efficiency of slabs by increasing the number of the slabs possible to carry into a slab edge heater. CONSTITUTION:1st and 2nd roller tables arranged at the front stage of a heating roller table always operated at a low speed are operated at a low speed, the 2nd roller table of them transfers a preceding slab and when the 1st roller table transfers a succeeding slab, a means 15 for detecting slab pass detects the passing of the tail end of the preceding slab 19 through the roller table according to an output signal S13 of a slab sensor arranged at the downstream end part of the roller table 22. A means 16 to determine whether or not the slab avoids collision determines whether or not succeeding slab exists as far as it does not collide with the preceding slab even when the 1st and 2nd roller tables are operated at a high speed based on the tail end passing signal of a detected preceding slab and an output signal S14 detected by a slab sensor arranged on the upstream of the 2nd roller table. When a high speed switching means 17 determines that the succeding slab does not collide with the preceding slab, the 1st and 2nd roller tables are switched to a high speed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention conveys a slab inserted at high speed to a heating roller table that constantly operates at low speed via a roller table on the insertion port side that switches between high and low speeds. This invention relates to a slab edge heater that heats on a heating roller table, and particularly relates to a roller table control device that switches the speed of the roller table on the insertion port side so as to narrow the interval between slabs during heating.

0002

2. Description of the Related Art As shown in FIG. 3, the inside of a slab edge heater includes a roller table A21 (hereinafter referred to as roller table A), a roller table B22 (hereinafter referred to as roller table B), and a roller table C23 (hereinafter referred to as roller table B). A large number of roller tables are sequentially arranged starting from an insertion opening (not shown), such as roller table C). Of these, roller tables A and B are switched between high speed and low speed and are mainly used for conveying slabs, while roller tables after roller table C are always operated at low speed and used for heating. In this case, since the slab is fed through the insertion port at high speed, both roller tables A and B must be operated at high speed until the leading slab 19 is transported by roller table B and the trailing slab 20 is transported by roller table A. Can be done.

However, from just before the preceding slab 19 contacts the roller table C until it leaves the roller table B, the roller table B must be operated at a low speed. Further, when the trailing slab 20 is transferred from roller table A to roller table B while roller table B is operating at low speed, roller table A must also be operated at low speed.

[0004] As described above, roller tables A and B are subject to restrictions on conveyance speed, but in order to increase processing efficiency, it is necessary to reduce the distance between the leading slab 19 and the trailing slab 20 on roller table C as much as possible. be.

FIG. 4 is a block diagram showing the configuration of a conventional roller table control device for a slab edge heater. In the figure, an operation command S1 is given to roller table B low speed switching means 6, roller table B high speed switching means 7, roller table A high speed switching means 11, and roller table A low speed switching means 12. A slab sensor 4 detects that a slab is inserted at the front stage of the roller table A.
When the slab insertion start detection means 5 detects the start of insertion of the preceding slab 19 based on the slab detection signal S4 (not shown), the roller table B high speed switching means 7 issues a high speed switching command to the roller table B speed reference generation means 8. The roller table A high speed switching means 11 gives a high speed switching command to the roller table A speed reference generating means 18. Roller table B speed reference generating means 8 and roller table A speed reference generating means 18 generate a speed reference that changes from low speed to high speed at a predetermined rate of change. Accordingly, both roller tables A and B are operated at high speed, thereby driving the leading slab 19 into the slab edge heater.

Next, when the following slab 20 is detected by the slab sensor 4, the roller table B high speed switching means 7 and the roller table A are switched in the same manner as described above.
The high speed switching means 11 each generate a high speed switching command, but the roller table B speed reference generating means 8 and the roller table A speed reference generating means 18 continue to generate high speed speed references. Therefore, roller tables A and B are maintained in high speed operation and the trailing slab 20 is also carried into the slab edge heater.

Here, since the roller tables after roller table C are always operated at low speed, a slab sensor 2 (see FIG. 3) is provided between roller tables B and C, and the roller table is detected based on the slab detection signal S2. The B deceleration point detection means 3 detects the deceleration point and provides a deceleration signal to the roller table B low speed switching means 6. The roller table B low speed switching means 6 gives a low speed switching command to the roller table B speed reference generating means 8. As a result, roller table B is operated at low speed.

Furthermore, since roller table B is operated at a low speed, when transferring the trailing slab 20 to roller table B, roller table A must also be operated at low speed. Therefore, a slab sensor 9 (see FIG. 3) is provided at the downstream end of the roller table A, and based on the slab detection signal S9, the roller table A deceleration point detection means 10 detects the deceleration point and transmits the deceleration signal to the roller. Table A is applied to the low speed switching means 12. Therefore, the roller table A low speed switching means 12 is the roller table A speed reference generating means 1.
Give a low speed switching command to 8. As a result, roller table A is also operated at low speed.

[0009]

[Problems to be Solved by the Invention] In the above-described conventional roller table control device for a slab edge heater, the roller table A is moved when the slab sensor 9 detects the following slab 20, regardless of the position of the preceding slab 19. was slowing down. For this reason, on the roller table C, the gap between the leading slab 19 and the trailing slab 20 sometimes increases.

[0010] As described above, if the distance between the leading slab 19 and the trailing slab 20 increases, the number of slabs that can be carried into the slab edge heater decreases, causing a problem that the slab conveyance efficiency decreases.

The present invention was made in order to solve the above-mentioned problems, and it is a slab edge heater that can increase the number of slabs that can be carried into the slab edge heater as much as possible and improve the slab conveyance efficiency. The purpose is to obtain a roller table control device.

0012

[Means for Solving the Problems] The present invention enables first and second roller tables, which are disposed upstream of a heating roller table which is always operated at a low speed, to be switched between high speed and low speed according to a command, and to The preceding slab is the second slab.
In a roller table control device for a slab edge heater, the first and second roller tables are switched to low speed and operated when the following slab is conveyed by the first roller table and the trailing slab is conveyed by the first roller table. , a first slab sensor that detects a slab upstream of the second roller table, and a second slab sensor that detects a slab at a downstream end of the second roller table;
Slab passage detection means detects that the tail end of the preceding slab has passed the second roller table based on the output signal of the second slab sensor; Based on the tip detection signal of the trailing slab detected by the first sensor, the first
and a slab collision avoidance determining means for determining whether or not a trailing slab exists within a range where there is no risk of collision with the leading slab even if the second roller table is operated at high speed; and high-speed switching means for switching the first and second roller tables to high-speed operation when it is determined that there is no roller table.

[0013]

[Operation] In this invention, based on the slab detection signal at the downstream end of the second roller table, it is detected that the tail end of the preceding slab passes through the second roller table; Based on the tail end passing signal and the slab detection signal detected upstream from the second roller table,
The slab range where there is no risk of the trailing slab colliding with the leading slab even if the first and second roller tables are operated at high speed is calculated, and if the trailing slab exists within this slab range, the first and second roller tables are moved. In order to switch to high-speed operation, the trailing slab is conveyed at high speed in relation to the position of the leading slab, and the gap between it and the leading slab is reduced.This increases the number of slabs that can be carried into the slab edge heater and Conveyance efficiency can be increased.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, the same reference numerals as in FIG. 4 indicate the same elements. A slab sensor 1 detects the slab at the downstream end of the roller table B.
Based on the slab detection signal S13 of 3 (see FIG. 3), the roller table B passage detection means 15 detects that the tail end of the preceding slab 19 has passed the roller table B, and the slab is detected between the roller tables A and B. Detecting slab sensor 1
Based on the slab detection signal of No. 4 and the tail end passage signal of roller table B passage detection means 15, roller tables A and B are detected.
A slab collision avoidance determination means 16 that determines whether the trailing slab 20 exists in a slab collision avoidance range in which the trailing slab 20 does not collide with the leading slab 19 even when the vehicle is driven at high speed; As a condition, a slab spacing reduction high speed switching means 17 is added which gives a high speed switching command to the roller table A speed reference generation means 18 in accordance with the output of the slab collision avoidance determination means 16.

The operation of this embodiment configured as described above will be explained below, focusing on the elements newly added to the conventional device.

Now, as shown in FIG. 3, both roller tables A and B are operated at high speed, and the leading slab 19
is conveyed by roller table B, and the following slab 2
0 is being conveyed by roller table A. Then, based on the slab detection signal S2 of the slab sensor 2, the roller table B deceleration point detection means 3 detects the preceding slab 19.
When the tip of roller table B is detected, low speed switching means 6 of roller table B is detected.
The low speed switching command is sent to the roller table B speed reference generating means 8.
is applied, and roller table B is switched to low speed operation. Further, when the roller table A deceleration point detection means 10 detects the leading end of the trailing slab 20 based on the slab detection signal S9 of the slab sensor 9 during low speed operation of the roller table B, the low speed switching means 12 of the roller table A is activated. A switching command is given to the roller table A speed reference generating means 18, and the roller table A is also switched to low speed operation.

Here, based on the slab detection signal S13 of the slab sensor 13, the roller table B passage detection means 1
5 detects that the tail end of the preceding slab 19 has passed the roller table B, and applies a detection signal to the slab collision avoidance determining means 16. On the other hand, the slab collision avoidance determination means 16 uses the tail end passing signal of the preceding slab 19 and the slab sensor 14.
Based on the slab detection signal S14 of
A range in which the slab 0 does not collide with the preceding slab 19 even if it is conveyed at high speed is calculated, and when the range is within this range, a signal enabling high speed operation is given to the slab spacing reduction high speed switching means 17. Therefore, the slab spacing reduction high speed switching means 17 gives a high speed switching command to the roller table B speed reference generating means 8 and the roller table A speed reference generating means 18.

[0018] As a result, roller tables A and B
is switched to high-speed operation, and the trailing slab 20 is transported so that the slab interval with the leading slab 19 is narrowed.

Hereinafter, the trailing slab 20 is the leading slab 19.
A method of determining whether the collision is within the range, and
A method of detecting that the tail end of the preceding slab 19 passes through the roller table B will be described with reference to the explanatory diagram of FIG. 2.

First, the high speed is V, the low speed is V, the distance between the slab sensor 14 and the slab sensor 2 is L, and after the tip of the trailing slab 20 is detected by the slab sensor 14, the tail end of the leading slab 19 is detected by the roller. L1 is the distance that the trailing slab 20 moves until it passes table B, and the distance from the position where the tail end of the slab passes roller table B (center position of the tip roller of roller table B) to slab sensor 2. Let be L2.

[0021] Here, if the trailing slab 20 is conveyed at high speed at the time when the leading slab 19 passes the roller table B, the amount of movement L by which the trailing slab 20 is conveyed at high speed is
x is Lx = L-L1

...(1), and if the travel time during this time is T, then T=(L-L1)/V

...(2) Also, the distance Ly that the preceding slab 19 moves during this time is Ly = v・T

...(3) Therefore, the distance Lz from the position of the slab sensor 14 after T time to the tail end of the preceding slab 19 can be obtained by the following equation.

[0022] Lz =v・T+L−L1 −L2
…(4)
Therefore, the distance ΔL between the tail end of the leading slab 19 and the tip of the trailing slab 20 is calculated from equations (1) and (4) as follows: ΔL=Lz −Lx =v・T−L2
(5) Here, in order for the trailing slab 20 to not collide with the leading slab 19, ΔL=K However, K only needs to be a safe distance. Therefore, from equations (2) and (5), (L-L1
)・v/V−L2 >K That is, {v・L−V(L2 −K)}/v>L1
…(6) becomes (6)
When the slab collision avoidance determination means 16 obtains L1 for which the equation holds true, it is determined that the trailing slab 20 will not collide with the preceding slab 19.

Next, if the distance from the position of the roller table passage sensor 13 to the position where the tail end of the slab passes through the roller table B (the center position of the tip roller of the roller table B) is L3, then the time required to move between this distance is L3. T1 is
T1 = L3 /v
…(
7) The passage time T2 from the time when the tail end of the slab passes the roller table passage sensor 13 is calculated by the roller table B passage detection means 15 to determine the elapsed time T2.
When T2 = T1 holds true, that is, the following equation T2 = L3 /v
…
It is determined that the tail end of the slab has passed the roller table B when (8) is satisfied.

In the above embodiment, the slab collision avoidance judgment is made by setting the distance between the position of the slab sensor 2 and the slab sensor 14 as L;
As long as the mutual spacing with 4 is known, slab collision avoidance can be determined simply by modifying the above equation.

Furthermore, in the above embodiment, the slab sensor 14 is installed between the roller tables A and B to judge whether to avoid a slab collision. A similar slab collision avoidance judgment can be made.

[0026]

[Effects of the Invention] As is clear from the above explanation, according to the present invention, it is determined through calculation that the following slab does not collide with the preceding slab, and the following slab is conveyed again at high speed, so that the interval between the slabs can be reduced. It can be carried into the slab edge heater, and thereby the slab can be transported efficiently.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the relationship between the distance over which a slab is conveyed and time in order to explain the operation of an embodiment of the present invention.

FIG. 3 is a roller arrangement diagram and a slab sensor arrangement diagram of a slab edge heater to which the present invention is applied.

FIG. 4 is a block diagram showing the configuration of a conventional slap spacing control device for a slab edge heater.

[Explanation of symbols]

6 Roller table B low speed switching means 7 Roller table B high speed switching means 8 Roller table B speed reference generation means 11 Roller table A high speed switching means 12 Roller table A low speed switching means 13 Slab sensor 14 Slab sensor 15 Roller table B passage detection means 16 Slab collision avoidance determination means 17 Slab spacing reduction high speed switching means

Claims (1)

[Claims] 1. A first and second roller table disposed upstream of a heating roller table which is always operated at a low speed is switched between high speed and low speed according to a command, and the preceding slab is driven by the second roller. In the roller table control device for a slab edge heater that switches and operates the first and second roller tables at low speed when the trailing slab is conveyed by the first roller table and the following slab is conveyed by the first roller table, a first slab sensor that detects a slab upstream of the second roller table; a second slab sensor that detects a slab at the downstream end of the second roller table; and an output of the second slab sensor. slab passage detection means for detecting that the tail end of the preceding slab has passed the second roller table based on a signal; Slab collision avoidance determination means for determining whether or not a following slab exists in a range where there is no risk of collision with the preceding slab even if the first and second roller tables are operated at high speed, based on the slab tip detection signal. and a high-speed switching means for switching the first and second roller tables to high-speed operation when it is determined that there is no risk of the following slab colliding with the preceding slab. Control device.