JP2520046Y2 - Electric furnace temperature measuring / sampling device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling device for measuring the temperature and composition of molten metal in an electric furnace used for melting metal materials and refining molten metal.

[0002]

2. Description of the Related Art In the operation of an electric furnace for refining, after the scrap is melted, the refining and
Carry out the heating step. For this reason, after melting the scrap, it is necessary to continue the operation while appropriately measuring the temperature and composition of the molten metal until the steel is tapped.
Conventionally, the molten metal sampling work was performed by manually extracting the molten metal from the work opening of the electric furnace with an iron ladle and dipping the probe in the molten metal in the same manner when measuring the temperature. Such measurement of molten metal composition / temperature is necessary even in the operation of a converter, and the work of measuring molten metal composition / temperature is mounted on the holder with a probe that detects the composition / temperature.
A technique is used in which a device in which a holder is fixed to a trolley capable of traveling is carried out by remotely driving the trolley. In recent years, it has been considered in the electric furnace industry to apply converter technology to electric furnaces in order to abolish dangerous work, automate operations, and improve productivity.

[0003]

[Problems to be Solved by the Invention] However, in the case of an electric furnace, unlike in the case of a converter, the inside of the furnace is changed from scrap solids to molten metal liquid and changes into liquid metal. The liquid state of molten metal is not always the only one. In addition, in the operation of the electric furnace, it is necessary to measure the composition and temperature of the molten metal as early as possible, and to make a work decision on the subsequent heating process of refining. At the time of measurement, scrap is not completely melted, and scrap and molten metal coexist.

From these things, when trying to apply the technology of the converter in the electric furnace, when the carriage is run and the probe is immersed in the molten metal to measure the temperature and sample, scrap is present in the immersed part. If this happens, an accident such as breakage of the probe or breakage of the device may occur, and even if the converter technology is applied to the electric furnace, it has a drawback that it cannot be used stably.

An object of the present invention is to provide an apparatus capable of measuring temperature and sampling molten metal without breaking the probe or damaging the apparatus even when scrap and molten metal coexist in the electric furnace. And

[0006]

The gist of the present invention is to attach a scrap detection rod to a holder for mounting a probe for measuring the temperature or composition of molten metal in a furnace so as to project from the tip of the probe. The temperature measuring / sampling device for an electric furnace is provided with a control device for automatically stopping a trolley with a holder fixed by a signal from a scrap detection rod.

[0007]

In the present invention, since the scrap detection rod protruding from the probe is provided, even if the scrap is present in the immersion portion, the scrap detection rod having strength hits the scrap first, so that the probe is not broken. Also, since the scrap detection rod automatically stops driving the truck with a signal when the scrap hits the scrap, and has a control device that switches to the backward direction, there is no need to apply excessive force to the device. There will be no damage. Of course, after the stop, the operation of the next operation such as backward movement may be performed by the manual push button.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a temperature measuring / sampling device for an electric furnace according to the present invention. A probe 4 for measuring the composition and temperature of the molten metal 11 in the electric furnace 9 is mounted on a holder 3, and the holder 3 is mounted on a carriage 2 traveling on a traveling frame 1 supported by a frame (not shown). It is fixed. As an example of the means for traveling the trolley 2, the chain 7 connected to the front and rear of the trolley 2 is provided with sprockets 8a at the front and rear ends of the traveling frame and sprocket 8c at the center of the frame.
Although the method of driving the vehicle with the drive device 6 exerting forward or backward force is shown in the above, other methods may be used.

A scrap detection rod 5 having a length protruding from the probe 4 in the traveling direction is firmly fixed to the holder 3 by a fixing method (not shown) such as a bolt or a cotter. The temperature measuring / sampling device is always on standby outside the furnace, and is attached to the furnace lid 10 or the furnace body 9 of the electric furnace at the time of measurement (an example is shown attached to the furnace lid). The lid (not shown) of the device opening 12 is opened, and the carriage 2 is lowered. At this time, if there is scrap in the part to be immersed, the scrap detection bar 5 first comes into contact with the scrap, making it difficult to descend further and the vehicle is stopped. At this time, to explain with an example of the drive device 6 shown in FIG. 2, by providing the cam clutch mechanism 14 at the output portion of the electric motor 13, even if the traveling of the carriage 2 is stopped, an abnormal force is not applied to the entire device. Further, a pulse transmission device 15 having a structure and directly connected to the sprocket 8d is installed to detect the degree of change of the pulse transmission device 15 as a scrap detection rod stop signal to automatically stop, and automatically move the carriage 2 as necessary. Retreat control. FIG. 3 shows an example of the flow of this control device.

The immersion time of the scrap detection rod 5 in the molten metal is extremely small both during measurement and scrap detection, and the degree of melting loss is small even with steel, but since slag adheres, cast iron is less likely to adhere. The material may be the base material of the scrap detection rod 5, or the surface of the scrap detection rod 5 may be coated with powder such as zirconia-based or iron-chromium-based powder.

[0011]

As described above, the temperature measuring / sampling device for an electric furnace according to the present invention does not break the probe or damage the device even when scrap and molten metal coexist in the electric furnace. Since it can be operated remotely, stable measurement can be performed. Therefore, the dangerous work of the worker can be eliminated and the operation can be automated, which contributes to improvement of productivity and reduction of operation cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a structural example of a temperature measuring / sampling device for an electric furnace of the present invention.

FIG. 2 is a mechanism diagram including a control mechanism of a drive unit according to the present invention.

FIG. 3 is a diagram showing an example of a control flow.

[Explanation of symbols]

 1 Travel Frame 2 Bogie 3 Holder 4 Probe 5 Scrap Detecting Rod 6 Driving Device 11 Molten Metal

Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location G01N 1/10 G01N 1/10 S (72) Creator Makoto Takahashi 46-59 Nakahara, Tobata-ku, Kitakyushu, Fukuoka New Nippon Steel Co., Ltd., Machinery & Plant Division (56) References: Kaihei Hei 1-120661 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A trolley in which a scrap detection rod is attached to a holder for mounting a probe for measuring the temperature or composition of molten metal in a furnace so as to project from the tip of the probe, and the holder is fixed by a signal from the scrap detection rod. A temperature measuring / sampling device for an electric furnace, which is equipped with a control device that automatically stops.