JP3330441B2 - Steel sheet transfer control method - 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 for controlling the conveyance of a steel sheet.

[0002]

2. Description of the Related Art Generally, a steel sheet which has been subjected to a rolling step and a shearing step has a required product size.
It has a steel plate width and a steel plate thickness. In the refining process for such a steel sheet, various processes such as inspection, care, heat treatment, and painting are performed, and a temporary steel plate is temporarily placed in order to cope with a difference in a processing pitch in each processing process.

As a means for directly moving the steel sheet to each of the above-described processing steps, a transfer table is usually used. As this transfer table, a plurality of roller groups are connected by a single line shaft. In this case, a line shaft drive system driven by one drive motor is employed. The number of steel sheets transported by such a line shaft drive type transport table is usually one steel sheet per table, and it is difficult to transport several steel sheets at a time. This is a considerable complexity in control, such as the necessity of simultaneous driving between adjacent tables when a steel sheet straddles between tables, control of the drive timing of the front and rear tables, and the accuracy of tracking of the steel sheet position for that purpose. Is required. Therefore, a simple control method is generally used in which a steel sheet position sensor is provided between the tables and the steel sheet is conveyed and stopped according to the ON / OFF detection signal.

[0004]

However, in the case of the conventional method of transporting one steel plate per table, the steel plate is stopped at a predetermined position on the transport line, and inspection work or the like is performed on the steel plate. If a case occurs, only one steel plate can be implemented per stop,
There is a problem that the transport efficiency is reduced.

[0005] In particular, the length of the steel plate is not constant, and the length is continuously, for example, 1/2, 1/1, of the line shaft length.
If 3 items are sent in, 2
Although there is a space for accommodating more than one steel sheet, the efficiency of the entire line is remarkably reduced in units of one sheet. In addition, if the location is an important step that becomes a bottleneck in the entire line, for example, there is a large problem in efficiency.

[0006] It is an object of the present invention to provide a method for controlling the conveyance of a steel sheet which solves the above-mentioned problems of the prior art.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a transport table driven by a line shaft drive system provided in connection with an upstream side and a downstream side of a line is provided near a discharge side of the upstream side transport table. A control method for transporting a plurality of steel sheets as control points by providing a detector, wherein a preceding material is transported at a predetermined speed by an upstream transport table, and tracking is started after the tip reaches the control point. And the step of decelerating the downstream transport table at the time when the trailing end of the preceding material has passed the control point and stopping after transporting the predetermined distance, and transporting the following material by the upstream transport table, Decelerating the upstream transfer table when the leading end reaches the control point; and raising the downstream transfer table when the leading end of the following material has been transferred by a predetermined distance. And transporting the preceding material at a predetermined speed, and transporting the succeeding material at the same speed as the upstream transport table and the downstream transport table, and the rear end of the succeeding material has moved to the downstream transport table. Stopping the upstream transfer table at a point in time, and stopping the downstream transfer table when the leading end of the preceding material reaches the end of the downstream transfer table. .

[0008]

According to the present invention, the start and stop of the line shaft drive type transfer table connected to the upstream side and the downstream side of the line are controlled synchronously. A plurality of steel plates can be accurately carried on the same table.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a system diagram showing a configuration of an embodiment of the present invention. In the figure, reference numeral 10 denotes an upstream transfer table, and a plurality of transfer rollers 11 are connected to one line shaft 12.
The line shaft 12 is driven by a single drive motor 13. A rotation speed detector 14 is attached to the rotation shaft of the drive motor 13, and the drive motor 13 is controlled by a motor control device 15.

Reference numeral 20 denotes a downstream transfer table, which is provided in connection with the upstream transfer table 10 and has the same configuration as the upstream transfer table 10. That is, the plurality of transport rollers 21
The line shaft 22 is rotatably coupled to the line shaft 22. The line shaft 22 is driven by a single drive motor 23, and a rotation number detector 24 is attached to a rotation shaft of the drive motor 23.
The drive motor 23 is controlled by a motor control device 25.

Reference numeral 30 denotes a steel plate position detector for detecting a steel plate 31 mounted on the upstream transfer table 10. A table controller 40 has two functions of a preceding material stop position control mode and a parallel transport control mode. Thus, after the steel plate position detector 30 recognizes the steel plate 31, the upstream and downstream transfer tables 10, 20 are controlled at respective timings while tracking the position.

With respect to the preceding material stop position control mode and the parallel transport control mode of the table controller 40, specific control procedures will be described with reference to FIGS. In any case, the steel plate 31 is transported in the direction indicated by the arrow F.
· Preceding material stop position control mode; First, as shown in FIG. 2 (a), to convey the preceding material 31A by the upstream conveying table 10 at a constant speed v ₁ as shown in FIG. 2 (b). Then, at time t ₀ when the tip reaches the steel plate position detector 30 which is the control point, the steel plate position detector 30 is turned on, and the ON signal is input to the table controller 40. Incidentally, during the leading edge of the preceding material 31A is required to reach the steel plate position detector 30, allowed to start the downstream transport table 20 at a timing of a time t ₁ as shown in Figure 2 (c). After that, the steel plate position detector 30 is
Tracks preceding material 31A which advanced over inputs an OFF signal to the table control unit 40 at the time point t ₂ when the rear end passes the steel plate position detector 30. Therefore, the table controller
40 determines that the preceding material 31A has moved to the downstream side transport table 20, outputs a deceleration command, and decelerates the downstream side transport table 20. At this time t ₂ , the speed of the downstream transfer table 20 is controlled to the same speed v ₁ as the speed of the upstream transfer table 10. Then, after advancing by a preceding material 31A at a predetermined speed v ₂ [Delta] L between That distance time t ₃ and t _4, to stop the downstream conveying table 20. Parallel transport control mode: As shown in FIG. 3 (a), with the preceding material 31A stopped on the downstream transport table 20, the following material 31B is shown by the upstream transport table 10 in FIG. 3 (b). Constant speed v like
Transported by _3, when t ₅ where its tip reaches the steel plate position detector 30, and inputs an ON signal of the steel plate position detector 30 to the table control unit 40. Therefore, the table control device 40 sets the upstream transfer table
A deceleration command is output to 10 to decelerate the following material 31B. on the other hand,
Figure 3 (c), the following material 31B of tip steel position detector 30 passes to a distance ΔL only at t ₆ which is advanced and outputs a start instruction of the downstream conveying table 20 by the downstream transport start table 20, to advance the preceding material 31A with a predetermined speed v ₄ at time t _7. At this time t ₇ , the upstream transfer table 10 is controlled to the same speed v ₄ as the speed of the downstream transfer table 20. As a result, the preceding material 31A advances at the same speed together with the following material 31B. Table control unit 40 is upstream conveying table at t ₈ the rear end of the trailing member 31B is moved on the downstream side conveying table 20
10 is stopped, and the leading end of the preceding material 31A is
To at t _9, which came to the end stop on the downstream side conveying table 20. As a result, the preceding material 31A and the following material 31B are simultaneously loaded onto the downstream-side transfer table 20.

According to such a procedure, the start and stop of the upstream transfer table 10 and the downstream transfer table 20 are continuously controlled by the table control device 40.
A plurality of steel plates can be efficiently carried on the same table. If such a control method is applied to the receiving side table, for example, when transferring a thick plate material to another line using a transfer car, it is possible to simultaneously transfer a plurality of thick plate materials by a transfer car. Thus, the transport efficiency can be improved.

[0014]

As described above, according to the present invention,
Since the start and stop of the line shaft drive type transfer table connected to the upstream side and the downstream side are controlled in synchronization, it is possible to simultaneously load multiple steel sheets on the same table with high accuracy. As a result, it is possible to improve the transport efficiency by as much as 20 to 50%. Also,
Since an automated line can be constructed, there is no occurrence of a trouble of collision between steel sheets, which contributes to improvement of product quality.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of an operation in a preceding material stop position control mode.

FIG. 3 is an explanatory diagram of an operation in a parallel transfer control mode.

[Explanation of symbols]

 10 Upstream transfer table 11 Transfer rollers 12 Line shaft 13 Drive motor 14 Rotation speed detector 15 Motor control device 20 Downstream transfer table 21 Transfer rollers 22 Line shaft 23 Drive motor 24 Rotation speed detector 25 Motor control device 30 Steel plate position detection Container 31 Steel plate 31A Leading material 31B Trailing material 40 Table controller

Claims (1)

(57) [Claims] 1. A transfer table driven by a line shaft drive system connected to an upstream side and a downstream side of a line is provided as a control point by providing a steel plate position detector near an outlet side of the upstream transfer table. A control method for transporting a plurality of steel plates, comprising: transporting a preceding material at a predetermined speed by an upstream transport table, and starting tracking after the tip reaches the control point; A step of decelerating the downstream transfer table at a point when the end passes the control point, stopping the transfer after transferring the predetermined distance, and transferring the following material by the upstream transfer table, and the tip reaches the control point. Decelerates the upstream transfer table at the point in time, and starts the downstream transfer table at a predetermined speed when the leading end of the following material is conveyed by a predetermined distance. Transporting the downstream material at the same speed as the downstream transport table, and stopping the upstream transport table when the trailing edge of the following material moves to the downstream transport table And stopping the downstream transfer table when the leading end of the preceding material reaches the end of the downstream transfer table.