JPH08198430A - Conveying method for long object and device thereof - Google Patents

Abstract

PURPOSE: To surely measure length of a long object within a certain precision so as to stop it for measurement and stop position control of the long object at a pick-up point for an automatic ceiling crane as to automation of a conveying line for the long object. CONSTITUTION: Multiple optical sensors 5 are arranged at equal intervals along a roller table l. When an optical sensor 5e approximately positioned in the center part detects the tip of a long object 4, a stopping action is started. When the number of the optical sensors 5, which are detecting the long object 4, on the forward side beyond the optical sensor 5e is equalized with the number of the optical sensors 5, which are detecting the long object 4, on the backward side, conveyance by means of the roller table 1 is stopped. Then, an interval for a hanging point based on the length of the long object 4 is instructed to a ceiling crane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for conveying long objects such as slabs in steel mills.

[0002]

2. Description of the Related Art In a fully automated slab transfer line, a slab carried out from a continuous casting machine is carried by a roller table. The slab transported by the roller table is lifted by an overhead crane and transported to a place called a slab storage yard. At this time, it is necessary to hang slabs of varying lengths.

In many conventional slab transportations, a roller table is used. In that case, the slab length measurement detects the number of rotations of the roller, and in combination with the on / off signal of the slab presence sensor, The slab length was calculated and measured. In addition, the stop position of the slab was determined by the presence sensor and the timer of the control system.

[0004]

The above technique is premised on that there is no slip between the slab of the conveyed object and the drive roller. However, since slip always occurs in actual operation, length measurement accuracy and stop accuracy Was uncertain.

The present invention is to surely realize the function within a certain accuracy even if it is incorporated into a fully automated transfer line.

[0006]

The above object is to obtain the number of long objects to be detected by a large number of optical sensors provided along the carrying direction of the roller table, and to detect the number of long objects to be carried in the front-back direction of the carrying direction. When the number of detections of 1 becomes the same, the conveyance by the roller table is stopped.

[0007]

According to the present invention, since the sensor mounting pitch is set to match the required stop accuracy, uncertain factors such as the roller rotation speed of the roller table and the control timer are not included. Long items of various lengths are sent,
When the number of detections by the optical sensors before and after the predetermined position is the same, the operation is stopped, so that the operation can be easily and almost accurately stopped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. A plurality of a pair of optical sensors 5 are installed at the same intervals along the conveyance direction of the roller table slightly above the roller table 1 for conveying the long object 4. The light sensor 5 detects an object when the light receiver does not detect light. An overhead crane (not shown) travels above the roller table 1 along the transport direction of the roller table 1. The suspender 9 of the overhead crane suspends the long object 4 at two points. The hanging tool 9 can change the interval between the two hanging points according to the length of the long object 4.

In this structure, the long object 4 is conveyed from the left side by driving the roller table 1. When the optical sensor 5e at the substantially central portion in the transport direction detects the long object 4 (step S1), the length of the long object is obtained by the optical sensor 5 (step S3). For example, it is stopped by the number of photosensors that detect the long object 4. Alternatively, it is determined by the position of the optical sensor 5 that does not detect the long object 4 at the rearmost end side. Next, by this length, the start time of the stop operation of the roller table 1, that is, the time of lowering the transport speed is determined, and the stop operation is started (step S).
5). If the length of the long object 4 is short, the speed is immediately reduced.
If it is long, delay the time to make it slow. According to this,
It can be stopped accurately and long objects can be transported in a short time.

Next, at a predetermined position (in this case, the optical sensor 5
When the number of detections of the optical sensor 5 is the same in the front-back direction of the carrying direction based on the position (e), the operation of the roller table 1 is stopped (step S9). The optical sensors 5 are arranged at a predetermined interval, and when the number of detections in the front-back direction is the same with respect to the predetermined position as the center, it is determined that the center of the long object 4 is at the predetermined position 5e, so the arrangement interval is rough. Also,
The center of the long object 4 can be stopped substantially at the predetermined position 5e.

Next, based on the length obtained in step S3, the crane is instructed the interval of the suspension points (step S11). This is a command for enabling the suspending device 9 to perform a suspending operation. It is sufficient to change the interval of the suspenders 9 step by step so that they can be safely hung, instead of continuously changing them according to the length of a long object. Since the length is detected by the optical sensor 5, the length can be measured almost accurately.

An optical sensor 5 on the upstream side of the roller table 1.
It is conceivable that the intervals of 1 are not provided at equal intervals, but are arranged so that the expected length of the long object 4 can be accurately measured. However, in this case, it is considered necessary to increase the length of the roller table 1.

[0013]

According to the present invention, the length measurement and the stop position of the slab can be directly controlled without being affected by the slip between the roller and the slab.

[Brief description of drawings]

FIG. 1 is a side view of a roller table according to an embodiment of the present invention.

FIG. 2 is a layout view of the optical sensor of FIG. 1, showing a state in which a long object is on the upstream side.

FIG. 3 is a layout view of the optical sensor of FIG. 1, showing a state in which a long object is stopped at a predetermined position.

FIG. 4 is a control flowchart of a position embodiment of the present invention.

[Explanation of symbols]

1 ... Roller, 4 ... Long object, 5 ... Optical sensor, 9 ... Hanging tool.

Claims (4)

[Claims] 1. The number of detections of a long object to be conveyed is obtained by a large number of optical sensors provided along the conveyance direction by a roller table, and the number of detections in the front-back direction of the conveyance direction is the same with a predetermined position as a center. In the case of, the conveyance by the roller table is stopped. 2. When an optical sensor at a predetermined position detects the tip of a long object conveyed by a roller table, a stop operation is started, and a large number of optical sensors provided along the conveyance direction detect the long object. If the number of detections is the same in the front-rear direction of the carrying direction with respect to the predetermined position,
A method of transporting a long object, characterized in that the transportation by the roller table is stopped. 3. When an optical sensor at a predetermined position detects the tip of a long product conveyed by a roller table, a large number of optical sensors provided along the conveyance direction determine the number of detections of the long product, A stop operation is started by obtaining a lowering point of the table transport speed, and when the number of detections in the front-rear direction of the transport direction around the predetermined position is the same, the transport by the roller table is stopped. A method of transporting long items that are characteristic. 4. A plurality of optical sensors provided at predetermined intervals along a carrying direction of a roller table for detecting a long object of the carried object, and the number of detection of the long object in the carrying direction by the optical sensors. A transporting device for a long object, comprising: means for stopping the transport by the roller table when the number of detections in the front-back direction of the transport direction is equal to the center of a predetermined position.