JPS6152923A - Speed control device of transfer table of steel material or the like - Google Patents

Abstract

PURPOSE:To promote the accuracy elevation in speed control and the stabilization by providing the position detecting device detecting the tip, etc. of a steel material and by calculating with comparing the position detecting signal thereof and the detecting signal of the revolutions of the driving motor of the transfer roller. CONSTITUTION:Plural position detecting devices 10-15 detecting the tip and/or tail end of a steel material 2 and provided between the transfer rollers 1 of a cooling device 3. A revolutions detector 6 is also arranged to the driving motor 5 of the transfer table 9. The actual speed of the movement of the steel material which is calculated from the actual position detecting signal detected by the position detecting devices 10-14 due to the transfer of the steel material 2 to be cooled and the space of the transfer table which is calculated from the revolutions detecting signal are calculated with the comparison. The number of revolutions of the driving motor 5 is thus revised and controlled accurately. Consequently the speed control of high accuracy is stably performed via the position detecting devices 10-15 being provided with approaching the material 2 to be cooled.

Description

[Detailed description of the invention] <Object of the invention> Industrial field of application The present invention relates to a speed control device for a conveying table for steel materials, etc.
Specifically, the present invention relates to a speed control I device for a conveyance table having a cooling device that cools a high-temperature material such as steel with water while moving it.

Conventional technology Generally, when controlling the conveyance speed of materials such as high-temperature steel materials in rolling lines, etc., optical position detectors such as high-temperature object detection devices and laser beam projectors are installed at multiple locations on the side of the conveyance table. The material position is detected at multiple points on the rolling line by detecting infrared rays emitted from the material, while the rotational speed of the table drive motor or conveyance roller group is separately detected, and these detected values are combined with the previous position detection signal. The conveyance speed is corrected to an appropriate speed by comparing the
Feedback control method is adopted. Furthermore, recently, digital detection devices such as pulse generators have been incorporated to detect the rotational speed of roller drive motors, etc., and the detection method has shifted to an extremely advanced and highly accurate detection method.

On the other hand, since high-quality steel with excellent strength and toughness can be obtained by directly water-cooling steel products online to a predetermined temperature immediately after rolling, in recent years each steel manufacturer has installed water cooling equipment on their rolling lines, A controlled cooling method has been introduced that adjusts the cooling rate over a wide range depending on the thickness and other factors. However, when a water cooling device is installed in a rolling line, the detection of the optical position detector is affected by water droplets from the roll cooling water or descaling water, or by steam generated from the scale sluice below the conveyor line. Not only are these optical position detectors unable to detect the position, but they are also unable to accurately detect the position of the steel material with the naked eye, especially in the winter when large amounts of water vapor and steam are generated. This is a serious problem for conveying table speed control based on position detection signals, and countermeasures are desired. In addition, it is clear that if a cooling device that uses a large amount of cooling water and generates many streams of steam is installed in a rolling line, it will further lead to poor detection accuracy and malfunction of the optical detector. Needless to say, with the conventional technology, it is impossible to detect the position of the water-cooled steel material passing through the cooling device, accurately control the speed of the steel material, and move the steel material at an appropriate threading speed. However, in the controlled cooling method, in order to impart the required material properties to the steel plate, the steel material during water cooling must be cooled to a predetermined temperature at an appropriate cooling rate, and the moving speed of the steel material during water cooling is controlled by the cooling m1 hour. In order to do this properly, it must be strictly controlled.

In addition, if speed control is performed correctly, it is possible to correctly recognize the position of the material to be cooled in the cooling device. For example, only the tip of the material to be cooled and/or a predetermined length of 119 Alternatively, it is possible to easily cool the material by 19 degrees for weak and uniform cooling, or to oscillate the material to be cooled within the cooling device.

In other words, Fig. 1 shows a conventional example with a cooling device.
.

It is a plan view of the rolling line of 3! Elj! The material 2 to be cooled such as steel material from 8 moves on the conveying roller 1, and the material 2 to be cooled at the mouth is sprayed with chilled water from the upper and lower surfaces in the cooling device 3, and is water-cooled for a predetermined period of time. The leading and trailing ends of the material 2 to be cooled before entering the cooling device 3 are detected by an optical position detector 4 installed on the side of the transport table 1, and the rotation speed detector 6 of the transport roller drive motor 5 detects the leading and trailing ends of the material 2 before entering the cooling device 3. It moves on the conveying roller 1 while being controlled to an appropriate speed by comparing the detection signals. However, when the material 2 to be cooled enters the cooling device 3 and is being water-cooled, the position of the material 2 to be cooled cannot be directly detected by the optical detector. For this reason, conventionally, the position detector 7 installed on the inlet side of the cooling device 3 detects the leading or trailing end of the material 2 to be cooled, and the rotational speed detection 23G of the drive motor 5 is detected during the elapsed time from this as the starting point. The moving distance of the cooled material is calculated by multiplying the peripheral speed of the conveyance roller 1 calculated from the detection signal, and the position of the cooled material 2 in the cooling device 3 is determined by 1. ) The material to be cooled 2 moves within the cooling device 3 at a speed equal to the circumferential speed of the transfer roller 1 that is emitted from the rotation speed detection signal of the drive motor 5; (b)
This is based on two prerequisites: that the position detector 7 on the side of the cooling system for three people is operating normally.

However, it is needless to explain that under the condition (a), the material to be cooled 2 slips on the conveyance roller 1 and does not necessarily move in synchronization with the circumferential speed of the conveyance roller. For this reason, as described above, a position detector is installed to detect the actual position of the material 2 to be cooled, and this signal is fed back to control the speed of the conveyance table.

Furthermore, as described above, in condition (b), since the position detector 7 is installed in the vicinity of the cooling device @3, the detection accuracy is poor due to the generation of steam, steam, etc., and in some cases, detection becomes impossible.

In short, it is clear how unstable and inaccurate the conventional example was.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned problems, and specifically proposes an excellent speed control device for an IInIn-bull that transfers high-temperature objects such as steel materials. To provide a control device capable of accurately detecting the position of a steel material, etc., even within the cooling device, and controlling the speed of a transportation table in a transportation line equipped with a cooling device for water-cooling materials.

<Structure of the Invention> Means for solving the problem and its operation, that is, the present invention provides a means for solving the problem and its effect. Between the conveyor rollers in the water cooling device,
At least two position detection devices are provided for detecting the leading end J5 and/or the tail end of the steel material, etc., and a rotation speed detector is provided for detecting the rotation speed of the drive motor that drives the conveyance roller, and from this rotation speed detector The present invention is characterized in that a drive control device is provided which compares and calculates a rotation speed detection signal of the drive motor with a position detection signal from the position detection device to control the rotation speed of the drive motor.

Therefore, the structure of this means and its operation will be explained in detail using drawings as follows.

First, FIG. 1 is an arrangement diagram of speed control 0 + farmland of a conveyance table according to one embodiment of the present invention, in which the material 2 to be cooled from rolling (rolling) moving on the conveyance roller cooling water 17 is applied to the upper and lower surfaces of the material 2 to be cooled in this device.
is injected and cooled to a predetermined temperature. Liquid cooling fj at this time
l material 2 is the position detection device 10.11.12.13.14.
15, its tip or/and tail end is detected by
This signal is transmitted to the drive control device 1G for the transport table 9.

Further, a rotation speed detector 6 attached to the drive motor 5 of the transport table 9 detects a rotation speed detection signal of the drive motor 5,
This detection signal is transmitted to the drive control device 1G. Therefore,
Compare the actual moving speed calculated from the actual position detection signal of the cooled material 2 by the position detection device 10.11.12.13.14.15 and the conveyance table speed calculated from the rotation speed detection signal of the drive motor 5. Through the calculation, the rotation speed of the drive motor 5 is corrected, an appropriate transfer speed of the cooled material 2 is obtained, and the cooled material 2 is transferred at this transfer speed. The position of the material 2 to be cooled on the conveyance table 9 including the inside of the cooling device 3 is determined by multiplying the transfer speed by the elapsed time from the start of detection of the tip or tail end of the position detection device 11, that is, the material movement. The distance is determined by calculating the distance, and the result can be confirmed by detecting the tip or tail end of the position detecting device 12, for example, located behind the position detecting device 11 that started measuring the elapsed time.

In addition, as mentioned above, the area around the cooling device 3 or the cold F! In order to accurately and stably detect the position using the position detection device in the J device 3, the following configuration is preferable.

This position detection device, for example 10, has an inlet 18 at one end.
The compressed gas 19 is introduced through the outlet a, and the compressed gas 19 is injected from the outlet 18b at the other end toward the detection surface 2a of the material to be cooled 2, and the gas passage between the inlet 18a and the outlet 18b is
A storage space 20 is provided inside the male, and a photoreceptor 21 is mounted inside the storage space 20, which faces the detection surface 2a and is capable of receiving infrared rays from the detection surface.

With this position detection device, it is possible to easily and highly accurately detect the position of the steel material in the process of water cooling in the cooling device, and this detection device can be installed close to the surface to be detected, making it possible to It is not necessary to install the device at a distance of 2 to 10 meters from the surface to be detected, as in the case of Disturbances caused by such factors are extremely small, and highly accurate position detection is possible.

<Effects of the Invention> As is clear from the above explanation, according to the table speed control device according to the present invention, extremely accurate and stable speed control can be performed even when a cooling device is installed on the line. Is it possible and is it correct even in a cold FA device? It is possible to detect the material position. Therefore, it is possible to appropriately manage the time for material to pass through the cooling chamber, the cooling rate can be strictly controlled, and the position of the material can be detected accurately, allowing It is also possible to strongly or weakly cool only a specific length of the end portion easily and stably.

[Brief explanation of the drawing]

Fig. 1 is a layout diagram of a conveyance table speed control*1+ device according to an embodiment of the present invention, Fig. 2 is a sectional view of an example of a position detection device, and Fig. 3 is a diagram of a table speed control device according to a conventional example. It is a layout diagram. Code 1: Conveyance roller 2: Cooled material 3: Cooling device 4: Optical position detector 5: Conveyance roller Drive motor G...Rotation speed detector 7...Optical position detector 8...Rolling mill 9...Transport table 10... Position detection device 11...Position detection device 12...Position detection device 13...Position detection device 14...Position detection device 15... position detection device

Claims (1)

[Claims] At a conveying table for steel materials, etc., which is cooled by an intermediate cooling device while the rolled steel materials, etc. are conveyed by conveying rollers,
At least two position detection devices are provided between the conveyance rollers in this water cooling device to detect the tip and/or tail end of the steel material, etc., and a rotation speed detector is provided to detect the rotation speed of the drive motor that drives the conveyance rollers. and a drive control device that compares and calculates the rotation speed detection signal of the drive motor from the rotation speed detector and the position detection signal from the position detection device to control the rotation speed of the drive motor. A speed control device for a conveying table for steel materials, etc.