JPH0486482A - Device for measurement/sampling of molten steel - Google Patents

Abstract

PURPOSE:To shorten the working time of measuring the temperature of molten steel by a method wherein the present device is provided with an arm, supported rotatably on a traversing trestle, installed on an inclined floor around a furnace body, through a bearing and an arced lance, inserted into the inserting port of the side wall of the furnace body and equipped at the tip end of the arm. CONSTITUTION:A lance 12 is formed so as to have an arced shape and is attached to the tip end of an arm 13, corresponding to the radius of curvature of the arc. A probe is attached detachably to the tip end of the arm 13. A traversing trestle 15 is traversed, a lid 22 for the lance inserting port 21 of the side wall of a furnace body 3 is opened automatically, a rotating cylinder device 18 is operated to rotate a lever 19 about a rotary shaft by a predetermined angle. The arced lance 12 is operated about a rotating axis 12 and a probe 2 at the tip end thereof is invaded into molten steel 24 through the lance inserting port 21 to measure the temperature of the molten steel. The stroke of the lance is small and the operating speed of the same is quick in such a manner and therefore, times for the measurement of the temperature of the molten steel as well as sampling time can be shortened remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arc lance type molten steel temperature sampling device for measuring and sampling the temperature of molten steel in an electric furnace.

[Prior art] Methods for measuring and sampling the molten steel side temperature of electric furnaces have begun to use mechanical methods rather than manual operations, as the measuring point tends to be farther away from the work opening as furnaces have become larger in recent years. However, in this case, nuclear devices can generally be divided into two types: fixed-bed installation/penetrating the furnace wall type and tilting-bed installation/penetration type.

In the former fixed bed installation/furnace wall penetrating type, the device is installed on a fixed bed independent of the floor supporting the furnace, and a lance with a probe for temperature measurement and sampling is inserted through the lance insertion hole provided in the furnace wall. However, recently, the latter type, which has a tilting floor and a through-hole type, has been used because it has the disadvantage of limiting the time that can be measured.

In the latter case, since it is installed on the same floor as the supporting bed of the furnace, it is possible to measure and sample the temperature of the molten steel at a low level from the moment it falls until just before tapping, or even when the furnace is tilted. This is because there is an advantage. However, since it uses a straight-pipe lance, it is usually configured as a furnace cover-through type, but the lance has a large stroke and a long operating time.

Fig. 3 shows an example of a conventional tilting floor installed furnace lid penetration type. In the figure, 1 is a lance, 2 is a probe attached to the tip of the lance 1, and 3 is a probe supported on a furnace support frame 3a. 3a is a furnace support frame, 4 is a tilting floor supported by the furnace support frame 3a, 5 is a furnace lid, and 6 is a furnace lid 5.
A lance insertion port 7 is a lifting device for the lance 1 installed on the same tilting floor 4 in the vicinity of the furnace body 3. The lifting frame 8 supporting the lance 1 moves up and down along the post 9, and During measurement, the lifting frame 8 is rotated 180'' to the opposite side of the furnace body 3 by the rotating frame 10 so as not to interfere with the operation.

[Problems to be Solved by the Invention] However, if the lance 1 is configured as a straight pipe as in the past, the distance from the furnace cover 5 to the molten steel surface is inevitably long, and the lifting stroke of the lance 1 is large. Therefore, the measurement work takes a long time. There were also other problems, such as the equipment becoming larger and heavier and requiring a wider installation space, resulting in higher equipment costs.

The present invention was made to solve the above-mentioned problems, and by using a curved tube arc type lance, it can be installed on a tilting floor, penetrate the furnace wall, and is compact, reducing measurement work time. The purpose of this invention is to provide a possible temperature measurement sampling device for molten steel.

[Means for Solving the Problems] In order to achieve the above object, the molten steel temperature sampling device according to the present invention measures and samples the temperature of molten steel by inserting a lance having a probe at the tip into the furnace body. A rotating pedestal is installed on a tilting floor around the furnace body, and the base end of the arm is rotatably supported on the swivel pedestal,
The lance is supported in a cantilevered manner at the tip of the arm, and
The lance is formed into an arcuate shape so that it can be inserted through a lance insertion opening provided in the side wall of the furnace body.

[Operation] By forming the lance with the co-probe in an arc shape, this arc-shaped lance can be moved in an arc on the tilting floor of the furnace body, and can be inserted into the furnace wall by penetrating the furnace wall. That is, the arm that supports the arcuate lance in a cantilevered manner forms a radius of curvature on the arcuate motion locus of the lance, and the base end pivot portion of the arm forms the center of rotation. By rotating this arm with a lever ratio, a large range of motion can be obtained with a small stroke, and the operating speed is fast, which means that temperature measurement and sampling of molten steel can be performed in a short period of time. Note that when replacing the probe or not performing measurements, the arm and lance are rotated at a predetermined angle on the rotating mount to be separated from the furnace body.

[Example] Fig. 1 is a side view showing an embodiment of the molten steel temperature sampling device of the present invention, and Fig. 2 is a plan view thereof.

In this embodiment, the lance 12 is formed into an arc shape and is supported in a cantilever manner at the tip of an arm 13 that forms the radius of curvature of the lance 12. A straight probe 2 similar to the conventional one is attached to the arc-shaped lance 12.

The center of rotation of the arcuate lance 12 is the base end of an arm 13 that supports the lance 12, and therefore the base end of the arm 13 is supported on a rotating pedestal 15 by a rotating shaft 14. The rotating pedestal 15 is installed on the tilting floor 4 of the furnace body 3, and is supported so as to rotate at a predetermined angle on an arcuate rail 17 about a pivot 16 at the base end.

A cylinder device 18 is provided between a lever 19 coupled to the rotating shaft 14 and a mounting member 20 on the pivot frame 15 to drive the arm 13 in rotation.

The length of the lever 19 is very short compared to the arm 13, so that a large range of movement of the lance 12 can be obtained with a short and small stroke of the cylinder device 18.

A lance insertion port 21 is provided in the side wall of the furnace body 3, and the lance 12 is inserted into the furnace body 3 through this insertion port 21. In the figure, 22 is a lid of the lance insertion port 21, and 23 is a rotating cylinder device of the rotating mount 15.

Next, the operation of the embodiment configured as above will be explained.

At the start of measurement, first attach a new probe to the tip of the lance manually or with an automatic attachment/detachment device, then rotate the rotating mount 15 using the rotating cylinder device 23, and attach the tip of the probe 2 of the lance 12 to the lance on the side wall of the furnace body 3. It is made to face the insertion opening 21. After that, the lid 22 is automatically opened (the automatic opening/closing device for the lid 22 is not shown, but it can be opened and closed automatically using a cylinder device or the like), and the lever 19 is pushed by the rotating cylinder device 18. The lever 19 is rotated by a predetermined angle, for example, 90 degrees, around the rotation axis 14.

As a result, the arm 13 connected to the rotating shaft 14 rotates, and the arc-shaped lance 12 supported in a cantilever manner at the tip of the arm 13 is moved in an arc around the rotating shaft 14, inserted through the lance insertion port 21, and The probe 2 is inserted into the molten steel 24 to measure the temperature and sample the molten steel.

After this measurement work is completed, the lance 12 is returned to its original position, and the rotating mount 15 is rotated horizontally at a predetermined angle, for example, 60°, and separated from the furnace body 3 in order to exchange the probe, take out a sample, etc.

In this way, the lance 1 has an arc shape with the base end pivot portion 14 of the arm 13 as the center of rotation and the length of the arm 13 as the radius of curvature.
By configuring the lance 2, it is supported on the tilting floor 4 of the furnace body 3, and it can be made into a furnace wall penetrating type lance, and a large range of movement can be obtained with a small stroke, and the movement speed of the lance 12 is fast, so it is easy to measure. Work can be done quickly. In addition, the installation space is small and the equipment cost is low because it can be made compact.

[Effects of the Invention] As described above, according to the present invention, since the lance is an arc-shaped lance that moves in an arc, it can be installed on a tilting floor and penetrate the furnace wall, and the stroke of the lance is small and the movement speed is low. Because it is fast, it can significantly reduce the time required for temperature measurement and sampling of molten steel. Furthermore, since the device is compact and can be installed even in a narrow space, the equipment cost is reduced and other effects are great.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the molten steel temperature sampling device of the present invention, Fig. 2 is a plan view of the same device, and Fig. 3 is a conventional molten steel temperature sampling device installed on a tilting bed and through the furnace lid. FIG. 3 is a side view of the device. 2... Probe 3... Furnace body 4... Tilting floor 12... Lance 13... Arm 14... Rotating shaft 15... Rotating frame 16... Pivot 17... Arc rail 18... Rotating cylinder device 19... Lever 20... Mounting member 21... Lance insertion port 22... Lid 23... Swivel cylinder device 24... Molten steel Fig. 2

Claims (1)

[Scope of Claims] A lance having a probe at its tip is inserted into a furnace body to measure and sample the temperature of molten steel, comprising a rotating pedestal installed on a tilting floor around the furnace body, and a base mounted on the rotating pedestal. It is characterized by comprising an arm whose end is rotatably supported, and an arc-shaped lance supported in a cantilevered manner at the tip of the arm and inserted through a lance insertion hole provided in the side wall of the furnace body. Molten steel temperature sampling device.