JP2001271119A - Control unit for pusher in continuous heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control unit for a pusher in a continuous heating furnace in which the shifting of the pusher corresponding to a transportation of a steel material can accurately be controlled. SOLUTION: In the control unit for the pusher pushing out the steel material S from the rear part of rails 3 toward the front part, when a bar-like sensor 1 reaches a reference position at the upper part of the front end of the rails, the moving of the pusher 2 starts. The steel material S at the first front line is transferred to the front side with this moving and brought into contact with the bar-like sensor 1, and when the steel material S and the bar-like sensor 1 are pushed out to the front side from the reference position by a prescribed distance T having smaller width than the width P of the steel material at the first front line, further, the moving of the pusher 2 is successively continued by a calculated distance L decreasing the prescribed distance T from the distance P, and when the pusher 2 is pushed out by the calculated distance L, this control unit is controlled so as to stop the pushing-out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for transferring a plurality of steel materials arranged in parallel in contact with each other on a rail in a continuous heating furnace from a rear side of the rail in order to transfer the steel material to a transport roller provided in front of the rail. The present invention relates to a control device for a pusher that pushes a steel material forward.

[0002]

2. Description of the Related Art Conventionally, the displacement of a pusher installed in a continuous heating furnace is controlled by a position sensor such as a magnetic sensor provided on the pusher side, which directly detects the position of the pusher or a cylinder for driving the pusher. That is being done on the basis of. Further, there is a type in which the position of a steel material to be extruded is detected, and the extrusion amount of a pusher is controlled based on the detected position.

[0003]

However, since a plurality of steel materials have resiliency, respectively, when the adhesiveness to contact each other before and after the extrusion becomes high, if a certain distance is extruded by the pusher, the frontmost row on the rails. Does not necessarily move forward by the same constant distance.

Therefore, it is not possible to accurately control the pusher extrusion amount corresponding to the movement of the steel material only by grasping the movement of only the extrusion side or the extraction side as in the conventional example. In particular, when the width of the steel material is different, control is difficult. For example, if a steel material with a large width is on the extrusion side behind the rail and a steel material with a small width is on the extraction side in front of the rail, extruding the pusher corresponding to the material with a large steel width will result in one screw Instead, two steel materials may be transferred onto the transport rollers from the front of the rail.

Accordingly, it is an object of the present invention to provide a pusher control device for a continuous heating furnace that can accurately control the movement of a pusher corresponding to the transfer of a steel material.

[0006]

In order to achieve the above object, a pusher control device for a continuous heating furnace according to claim 1 of the present invention is attached to a continuous heating furnace, and in a furnace (N), A plurality of steel materials (S) positioned over a plurality of rails (3) are transferred one by one to an upper surface of a transport roller (4) which is installed in front of the rail (3) and is lower than an upper surface of the rail (3). A pusher (2) for pushing the steel (S) forward from behind the rail (3) to contact the steel (S) positioned in the front row on the rail (3). A rod-shaped sensor (1) that can be moved back and forth as much as possible above the transport roller (4);
A rod-shaped sensor driving means (6) for moving the rod-shaped sensor (1) in the front-rear direction, a position detection sensor (5) for detecting the position of the rod-shaped sensor (1) in the front-rear direction, and a pushing amount of the pusher (2) When the push sensor (8) and the rod sensor (1) reach the reference position on the upper front end of the rail (3) via the rod sensor driving means (6), the pusher (2) is moved back and forth. Pusher (2) via pusher driving means (7) for moving in the direction
Is extruded, and the front-end steel material (S) moves forward by the extrusion and comes into contact with the rod-shaped sensor (1), and together with the steel material (S), the rod-shaped sensor (1) is moved from the reference position to the front-end steel width. When a signal extruded forward by a predetermined distance (T) smaller than (P) is received from the position detection sensor (5), a predetermined distance (T) is subtracted from the width (P) of the steel material in the front row. When the pusher (2) continuously pushes the pusher (2) for the calculated distance (L) and receives a signal extruded for the calculated distance (L) from the extrusion amount detection sensor (8), the pusher (2) is pressed. 2) a control unit (10) for stopping the extrusion.

According to a second aspect of the present invention, in the pusher control device for a continuous heating furnace, the control unit (10) is configured such that when the rod-shaped sensor (1) is moved forward from the reference position by a predetermined distance (T), the rod-shaped sensor (1) is moved. The sensor (1) is retracted outside the furnace (G) on the front side.

The symbols in parentheses indicate corresponding elements or items described in the drawings and the embodiments of the invention described later.

According to the pusher control apparatus for a continuous heating furnace according to the first aspect of the present invention, when the rod-shaped sensor reaches a reference position above the front end of the rail, the control unit starts pushing the pusher, and pushes the pusher. As a result, when the steel material in the front row contacts the bar sensor and the steel material and the bar sensor are pushed forward from the reference position by a predetermined distance smaller than the width of the steel material in the front row, the steel material and the bar sensor are determined from the steel width in the front row by a predetermined distance. The pusher is continuously pushed for the calculated distance obtained by subtracting the distance. As described above, the extrusion amount of the pusher is calculated in accordance with the amount of movement of the steel material on the extraction side, that is, the front row, and the pusher is controlled to be extruded by the calculated distance. The pusher can be moved accurately according to. In addition, since the control is performed while detecting that the pusher is actually pushed out by the calculated distance, the accuracy is further improved.

According to the second aspect of the present invention, in addition to the effects of the first aspect, when the rod-shaped sensor is moved a predetermined distance from the reference position to the front side, the rod-shaped sensor is moved to the front side. , The rod-shaped sensor is prevented from being damaged due to excessive force being applied to the rod-shaped sensor due to contact with the steel material.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pusher control device for a continuous heating furnace according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a main part of a continuous heating furnace according to an embodiment of the present invention, and FIG. 2 is a side view showing a configuration around a pusher shown in FIG. FIG. 3 is a side view showing the movement of the rod-shaped sensor, FIG. 4 is a block diagram showing an outline of the electrical configuration, and FIG. 5 is a flowchart showing an example of pusher pushing control.

In the pusher control device for a continuous heating furnace according to the embodiment of the present invention, a plurality of steel materials S positioned over a plurality of rails 3 are installed in front of the rails 3 and are transported lower than the upper surface of the rails 3. The present invention relates to a pusher 2 that pushes a steel material forward from behind a rail 3 in order to transfer the steel material one by one to an upper surface of a roller 4. In the embodiment of the present invention, two pushers 2 are provided in a continuous heating furnace having four rails 3 and six conveying rollers 4, and they move forward and backward in a synchronized manner.

This pusher control device comprises a rod-shaped sensor 1 movable in the front-rear direction (left-right direction in FIG. 1), and a rod-shaped sensor driving cylinder 6 functioning as a rod-shaped sensor driving means for moving the rod-shaped sensor 1 in the front-rear direction.
And a position detection sensor 5 utilizing magnetism for detecting the position of the rod-shaped sensor 1 in the front-rear direction, a pusher driving cylinder 7 functioning as a pusher driving means for moving the pusher 2 in the front-rear direction, and pushing of the pusher 2 It mainly comprises a rotary encoder 8 functioning as an extruded amount detection sensor for detecting the amount, and a control unit 10 for controlling the entire apparatus.

The rod-shaped sensor 1 has a rail 3
It is a sensor that detects the position of the steel material S located in the front row by contacting the steel material S located in the upper front row (steel material located on the leftmost side in FIG. 1), and is provided above the transport roller 4. ing. Thereby, the movement in the front-rear direction is not hindered. The rod-shaped sensor driving cylinder 6 moves the rod 6a forward and backward using pneumatic pressure generated by opening and closing the electromagnetic valve 14.
The rod-shaped sensor 1 is fixed to the rod 6a via a guide 15. The tip of the rod-shaped sensor 1 is attached to the inside of the furnace N, and the other portion on the driving side is attached to the outside of the furnace G.

The pusher driving cylinder 7 moves the rod 7a forward and backward using pneumatic pressure generated by opening and closing the electromagnetic valve 16, and the pusher 2 is fixed to the rod 7a. A rack 17 is fixed to the pusher 2, and the push-out amount of the pusher 2 is detected by detecting the rotation of a pinion 18 meshing with the rack 17 by the rotary encoder 8.

The control unit 10 is a CPU 1 for performing direct control.
1, a RAM 12 for reading and writing data, and a ROM 13 in which a control program is stored in advance.

Next, referring to FIG.
The processing content of No. 11 will be described. When the power is turned on by a switch (not shown), the CPU 11 performs initialization (step 1; hereinafter, the word "step" is omitted in parentheses). Next, data input processing is performed (2). Here, the width of the steel material S sequentially conveyed on the rail 3 and the value T of a predetermined distance described later are input in advance. The predetermined distance T is set to a value smaller than the width of the steel S that can be the steel S in the front row. Here, it was 30 mm.

Then, when there is a start instruction (3), the CPU 11 inputs the width of the steel S currently positioned in the front row on the rail 3 as P to the register (4),
The rod sensor 1 is moved to the reference position via the rod sensor driving cylinder 6 from the state of FIG. 3A to the state of FIG. 3B (5). The reference position is at the upper front end of the rail 3.

Then, the CPU 11 turns on the position detection sensor 5 (6), and causes the pusher 2 to perform the extrusion through the pusher driving cylinder 7 until the position detection sensor 5 is turned off from on (7). ,
8). As shown in the state of FIG. 3 (c), the steel material S located in the front row moves to the front side and comes into contact with the rod-shaped sensor 1 by the pushing by the pusher 2, and the rod-shaped sensor 1 moves forward by a predetermined distance T together with the steel material S. Then, the position detection sensor 5 is set to change from the ON state to the OFF state.

If it is detected in step 8 that the position detecting sensor 5 has changed to the off state, the state shown in FIG.
As in the state of (e), the rod-shaped sensor 1 is retracted to the outside G on the front side via the rod-shaped sensor driving cylinder 6 (9). The reason why only the rod-shaped sensor 1 is quickly retracted to the outside of the furnace G is to prevent the rod-shaped sensor 1 from being damaged due to excessive force applied to the rod-shaped sensor 1 due to the contact of the steel S. . And CPU1
1 subtracts a predetermined distance T from the width P of the steel material S in the front row,
The pusher 2 is continuously pushed out for the calculated distance L (10, 11). For example, when the width of the steel material S in the front row is 120 mm, 90 (= 120
-30) The extrusion control of the pusher 2 is performed so as to move the steel S forward by the distance of mm. Thereby, the steel material S in the front row on the rail 3 is transferred to the upper surface of the transport roller 4 lower than the upper surface of the rail 3.

When the rotary encoder 8 detects that the pusher 2 has actually moved by L, (1)
2) Stop the pushing of the pusher 2 and move the pusher 2 to the original position (13, 14). Unless there is an instruction to stop the device (15, 16), the process returns to the step 4 and returns to the steps 4 to 15 Is repeated.

In the present embodiment, another steel S is conveyed between the pusher 2 and the steel S in the last row on the rail 3 between step 14 and step 4. In particular, when a new steel material S is not conveyed, the pusher 2 may be moved forward from the position stopped in step 13 without moving the pusher 2 to the original position as in step 14.

As described above, in the present embodiment, the amount of extrusion of the pusher 2 is calculated in accordance with the amount of movement of the steel material S in the extraction side, that is, the front row, and the pusher 2 is further moved by the calculated distance. Since the control is performed while detecting that the 2 is actually extruded, it is possible to accurately move the pusher corresponding to the transfer of the steel material.

[0024]

As described above, according to the pusher control device for a continuous heating furnace according to the first aspect of the present invention, the extrusion amount of the pusher is adjusted to the extraction side, that is, the movement of the steel material in the front row. Since the pusher is calculated in accordance with the amount and controlled so as to push the pusher by the calculated distance, the pusher corresponding to the transfer of the steel material can be accurately moved. In addition, since the control is performed while detecting that the pusher is actually pushed out by the calculated distance, the accuracy is further improved.

Therefore, even when there are a plurality of steel materials having different widths on the rail, only one steel material in the front row can be accurately transferred to the transport roller.

According to the second aspect of the present invention, in addition to the functions and effects of the first aspect, when the rod-shaped sensor is moved forward from the reference position by a predetermined distance, the rod-shaped sensor is moved forward. , The rod-shaped sensor is prevented from being damaged due to excessive force being applied to the rod-shaped sensor due to contact with the steel material.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a continuous heating furnace according to an embodiment of the present invention.

FIG. 2 is a side view showing a configuration around a pusher shown in FIG.

FIGS. 3A to 3C show the movement of the rod-shaped sensor shown in FIG.
It is a side view shown in time series in order of (e).

FIG. 4 is a block diagram schematically showing an electric configuration according to the embodiment of the present invention.

FIG. 5 is a flowchart illustrating an example of pusher extrusion control according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 bar sensor 2 pusher 3 rail 4 transport roller 5 position detection sensor 6 rod sensor driving cylinder 6a rod 7 pusher driving cylinder 7a rod 8 rotary encoder 10 control unit 11 CPU 12 RAM 13 ROM 14 electromagnetic valve 15 guide 16 electromagnetic valve 17 Rack 18 Pinion N Inside furnace G Outside furnace S Steel

Claims (2)

[Claims] 1. A plurality of steel materials which are attached to a continuous heating furnace and extend over a plurality of rails in the furnace, are installed in front of the rails, and one at a time on the upper surface of a transport roller lower than the upper surface of the rails. A pusher control device for extruding a steel material from the rear of a rail toward the front to transfer the steel material, wherein the pusher is provided at a position above the transport roller so as to be able to contact a steel material positioned in a front row on the rail. A rod sensor that can move back and forth, a rod sensor driving unit that moves the rod sensor in the front and rear direction, a position detection sensor that detects the position of the rod sensor in the front and rear direction, and an extrusion that detects the push amount of the pusher. When the rod sensor reaches the reference position on the upper front end of the rail via the rod sensor driving means, the pusher is turned on. The pushing of the pusher is started via the pusher driving means for moving in the backward direction, and the pushing causes the steel in the front row to move forward and contact the rod-shaped sensor, and the rod-shaped sensor is moved together with the steel from the reference position to the width of the steel in the front row. When a signal extruded forward from the position detection sensor is received from the position detection sensor for a predetermined distance smaller than the width, the pusher is continuously pushed for a calculated distance obtained by subtracting a predetermined distance from the width of the steel material in the front row, and further continuously. A control unit for stopping the pushing of the pusher when the pusher receives a signal extruded by the calculated distance from the pushing amount detection sensor. 2. The continuous heating according to claim 1, wherein the control unit retracts the rod-shaped sensor out of the furnace on the front side when the rod-shaped sensor is moved by a predetermined distance from the reference position to the front side. Furnace pusher control.