JPS61293640A - Method for controlling feeding rate of powder - Google Patents

Abstract

PURPOSE:To automatically maintain the thickness of the powder on a molten steel always constant by measuring the thickness of the powder on the surface of the molten steel in a mold of a continuous casting device with an optical displacement sensor and controlling the feeding rate of the powder according to the measured value thereof. CONSTITUTION:The molten steel 2 is poured from a tundish car 5 by an immersion nozzle 4 into the mold 1 of the continuous casting device and the powder 3 for lubrication between the mold 1 and a steel input is supplied by a supply pipe 15 onto the molten steel. The surface level of the molten steel and the level of the powder 3 thereon are measured with the optical displacement sensor 10 and are inputted to a calculator 11, by which the thickness of the powder 3 is calculated. The difference between the calculated value and the set value of the powder thickness is inputted to a control command device 12. A drive unit 13 automatically controls the rotating speeds of feeding motors 16, 17 of a powder feeder 14 according to the output thereof to automatically maintain the thickness of the powder 3 on the molten steel 2 always at the specified value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a powder input amount control device in a continuous casting machine.

[Conventional technology]

FIG. 5 shows a side sectional view of a mold portion of a conventional continuous casting machine, which is the object of the present invention. Molten steel 2 is continuously poured into the mold 1 from the tanditushka 5 through the dipping nozzle/I/4, and the amount of molten steel poured is controlled so that the level of the molten steel in the mold 1 is constant. The molten steel level is measured by an ECD sensor 6 or the like. Powder S is always required above the molten W42 surface in mold 1 for purposes such as lubrication between the slab and mold 1, but powder 5 is consumed when molten steel 2 is pulled out from the mold as a slab. , it is necessary to supply it continuously.

Further, from the viewpoint of casting quality, it is desirable to keep the thickness of the powder 5 constant.

[Problem that the invention seeks to solve]

The amount of powder 5 consumed varies depending on casting conditions such as the slab drawing speed, and these casting conditions also change continuously.
Alternatively, a device for continuously supplying the powder 3 was manually adjusted.

[Object of the present invention]

It is an object of the present invention to provide a powder input amount control device for a continuous casting machine for automating the adjustment of the powder input amount, which had previously relied on manual labor.

[Configuration of the present invention]

The present invention, as means for achieving the above object, comprises a powder thickness detection device on the upper surface of the mold, a command device that receives this detection signal and outputs a signal for controlling the amount of powder introduced, and a powder amount adjustment device. . That is, the present invention provides a detection system that measures the molten steel level and powder level in the mold and calculates the powder thickness on the upper surface of the mold in a powder charging device for a continuous casting machine that includes a powder storage hopper, a powder air conveyance system, and a powder metering device. This is a powder input amount control device for a continuous casting machine, characterized by comprising a device, a command device that receives a detection signal from the device and outputs a signal for controlling the powder input amount, and a powder input amount adjustment device.

In the present invention, the powder thickness detection device specifically includes powder thickness detection means that detects the upper surface μ of the mold using an optical sensor and calculates the difference between it and the molten steel level obtained by the molten steel level sensor. It is what it is.

The present invention comprises a control device using this detection means.

〔Example〕

The present invention will be explained below based on the embodiments shown in FIGS. 1 and 2. FIG. 1 is a Bakugou automatic feeding device that implements the detection means according to the present invention, and FIG. 2 is an enlarged view of the detection section. In Figures 1 and 2, mold 1, molten steel 2, powder 3, soaked steel/l/4, tanditushka 5
The structure of the molten steel level sensor 6 and the continuous casting process are the same as those described above for the conventional apparatus, so a description thereof will be omitted.

This example has the following configuration.

Reference numeral 10 denotes an optical displacement sensor arranged so that the light path can be projected and received into the mold 1 without being blocked by the tanditshiker 5. The optical displacement sensor 10 collects light emitted from a light source 20 using a V lens 21, and irradiates the focused object onto the object to be measured.

The V-scum 22 focuses the spot of the light source 20 formed on the object to be measured 24 and forms an image on the linear optical sensor 25 (for example, a COD element. Therefore, when the distance between the object to be measured 24 and the sensor 10 changes, , the position of the spot formed on the object to be measured 24 moves on the linear optical sensor 23. Inside the sensor, the distance is calculated from the position of the light receiving point on the linear sensor 23. This optical method Since the displacement sensor 10 has a built-in filter, it is not affected by the flame generated in mode 1. Also, by performing an air purge on the light emitting and receiving parts, dust adhesion is prevented and the entire body is air-purged. Purging allows use in high temperature atmospheres.

Next, the output signal from the optical displacement sensor 10 is sent to a computing unit 11.
guided by. In the optical displacement sensor 10, the V of the powder 3
Since the thickness of Powder 3 is measured using Calculator 1,
It is obtained by calculating the difference between 1 and the molten steel level input. 12 receives the signal from the arithmetic unit 11;
A control command device 15 is a control command device 12 which outputs a signal to control the cutting motors 16 and 17 of the powder cutting device 14.
This is a dophip unit that controls the rotation speed of the cutting motors 16 and 17 by receiving signals from the cutting motors 16 and 17. The control command device 12 is a device that adjusts the rotation speed of the cutting motors 16 and 17 so that the powder thickness reaches the target value by comparing the powder thickness determined by the calculator 11 with a preset target value. (for example, PI control).

By configuring the rose droop control system as described above, it is possible to automatically supply powder through the supply pipe 15 so that the powder thickness is always constant under any casting conditions.

[Effects of the present invention]

Since the present invention is comprised of the detection device, command device, and powder input amount adjustment device described in detail above, it is possible to automatically feed powder so that the powder thickness is always constant under any casting conditions. It is something that produces an effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an automatic powder feeding device in a continuous casting machine according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the detection section (optical displacement sensor 10) in FIG. 1. 5
The figure is a side sectional view of a mold portion of a conventional continuous casting machine, which is the object of the present invention. Sub-Agents 1) Meifuku Agent Ryo Hagiwara - Sub-Agent Atsuo Anzai Figure 2

Claims (1)

[Claims] A detection device that measures the molten steel level and powder level in the mold and calculates the powder thickness on the upper surface of the mold, and its detection signal, in the powder charging device of a continuous casting machine, which consists of a powder storage hopper, a powder air conveyance system, and a powder metering device. 1. A powder input amount control device for a continuous casting machine, comprising a powder input amount adjusting device and a command device that outputs a signal for controlling the powder input amount in response to the command.