JP2015200453A - Temperature measuring sampling device of electric arc furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To immerse a temperature measuring probe positively in molten steel of an electric arc furnace frequently performing a forward inclination rolling motion and a rearward inclination rolling motion and measure the temperature.SOLUTION: A temperature measuring sampling device of an electric arc furnace includes: a ramp block 33 extending toward a cinder notch 12 of an electric arc furnace 1; a probe holding movable carriage 34 holding a rod-like temperature measuring probe 35 and movable in a longitudinal direction along the ramp block 33; and a supporting mechanism for supporting the ramp block 33 in a far-near forward or rearward movable manner and a relative upward or downward movable manner in respect to the cinder notch 12. The supporting mechanism comprises a movable carriage 31 in a far-near forward or rearward movable manner in respect to the cinder notch 12 of the electric arc furnace 1 and a lifting device 32 arranged at the movable carriage, and the lifting device 32 is provided with the ramp block 33.

Description

  The present invention relates to a temperature measuring sampling device for an arc furnace, and more particularly to a temperature measuring sampling device that can be suitably used for temperature measuring sampling of molten steel in an arc furnace that is tilted back and forth during operation.

  In order to perform reliable temperature control of the arc furnace, a temperature measuring probe is inserted into the furnace through the outlet and the temperature measuring sensor at the tip of the probe is directly immersed in the molten steel. By the way, the arc furnace is frequently moved in front of the furnace body by, for example, causing the furnace body to tilt backward on the base when discharging slag after scrap scrapping, and tilting forward on the base when slag is not discharged or when steel is discharged. Tilt and back tilt are performed. For this reason, in addition to the position of the spout opening being fluctuated, the vertical dimension of the spout opening itself is gradually reduced due to adhesion of slag and the like.

  Here, Patent Document 1 shows a sampling device of a vacuum degassing device, and the sampling device is a distance between a traveling base that can move forward and backward toward the degassing device and a tank lower inclined surface of the degassing tank. A tank position detector, a raising / lowering guide mechanism for raising and lowering a temperature measuring probe provided on the traveling platform parallel to the inclined surface, and a tilting mechanism for adjusting the tilt angle of the guide mechanism. Yes.

JP-A-7-207331

  However, in the sampling device of the vacuum degassing apparatus, in the arc furnace in which the vertical and horizontal positions of the tap outlet change simultaneously with the forward tilt and the backward tilt, and the vertical dimension of the tap outlet itself also changes. However, there is a problem that the temperature measuring probe cannot interfere with the temperature at the bottom edge (sill level) of the outlet and the door of the outlet.

  Therefore, the present invention solves such problems, and reliably measures the temperature by immersing the temperature measuring probe in the molten steel of an arc furnace that frequently performs forward tilting and backward tilting during operation. An object of the present invention is to provide a temperature measuring sampling device for an arc furnace.

  In order to achieve the above object, in the first aspect of the present invention, an inclined base (33, 56) extending in the direction of the tap outlet (12) of the arc furnace (1) and a rod-shaped temperature measuring probe (35, 58) are provided. A probe holding carriage (34, 57) that can be held and moved in the longitudinal direction along the inclined table, and a support mechanism (31) that supports the inclined table so as to be movable up and down relatively with respect to the spout (12). , 32, 52, 54, 55).

  In the first aspect of the present invention, when the furnace body of the arc furnace tilts back and forth, the position of the outlet of the furnace body changes back and forth and up and down accordingly. Here, in the first aspect of the invention, the temperature measurement probe is always output by following the change in the position of the outlet by appropriately moving the support mechanism up and down and appropriately moving the probe carriage back and forth in the longitudinal direction. Since it can be located in the vicinity of the mouth, the temperature measurement can be performed by reliably immersing the temperature measuring probe in the molten steel of the arc furnace through the tap hole.

  In the second aspect of the invention, the support mechanism supports the inclined base (33, 56) so as to be able to move further back and forth with respect to the tap hole (12).

  In the second aspect of the present invention, when the furnace body of the arc furnace tilts back and forth, the position of the outlet of the furnace body changes back and forth and up and down accordingly. Here, in the second aspect of the invention, the temperature measuring probe is always positioned near the outlet by following the change in position of the outlet by appropriately moving the temperature measuring probe back and forth or up and down by the support mechanism. Therefore, the temperature measurement can be performed by reliably immersing the temperature measuring probe in the molten steel of the arc furnace through the tap hole.

  In the third aspect of the invention, the support mechanism includes a movable carriage (31) capable of moving back and forth with respect to the tap outlet (12) of the arc furnace (1), and an elevating device (32) provided on the movable carriage. The tilting table (33) is provided on the lifting device (32). The effect similar to 2nd invention is acquired also by this 3rd invention.

  In the fourth aspect of the invention, the support mechanism includes a guide member (54) suspended from the rail member (52) so as to be movable back and forth with respect to the tap hole (12) of the arc furnace (1), and the guide. And an elevating member (55) mounted on the shaft so as to be vertically movable, and the inclined base (56) is provided on the elevating member.

  According to the fourth aspect of the invention, in addition to the effect of the second aspect of the invention, a sufficient working space can be secured facing the taphole.

  According to the fifth aspect of the invention, information on forward tilting or backward tilting of the arc furnace (1) is input, and the support mechanism (31, 32, 52, 54, 55) and / or the probe holding carriage ( 34, 57).

  According to the fifth aspect of the present invention, the control device can move the support mechanism and the probe holding carriage by a necessary amount, and the temperature measuring probe can automatically follow the forward or backward tilting motion of the arc furnace.

  The reference numerals in the parentheses indicate the correspondence with specific means described in the embodiments described later.

  As described above, according to the temperature measuring sampling device of the arc furnace of the present invention, the temperature measuring probe is surely installed in the molten steel of the arc furnace that changes its posture by frequently performing forward tilting and rearward tilting during operation. Temperature measurement can be performed by dipping.

It is a schematic side view of the temperature measurement sampling device which faces the tap outlet of an arc furnace in 1st Embodiment of this invention. It is a schematic side view of the temperature measurement sampling device which faces a spout in the state where the arc furnace is tilted forward. It is a schematic side view of the temperature measurement sampling device which faces the taphole in the state where the arc furnace is tilted backward. It is a principal part side view of the temperature measuring sampling apparatus which faces the tap outlet of an arc furnace in 2nd Embodiment of this invention. It is a front view of the temperature measurement sampling apparatus in 3rd Embodiment of this invention. It is a side view of the temperature measurement sampling device which faces the exit of an arc furnace. It is a general | schematic whole side view of the arc furnace in 4th Embodiment of this invention.

  The embodiment described below is merely an example, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

(First embodiment)
FIG. 1 shows an example of a temperature measuring sampling apparatus of the present invention. In FIG. 1, a temperature measuring sampling device E is provided on a fixed floor 2 that is substantially the same height as the platform 13 of the arc furnace 1, facing the taphole 12 provided on the rear wall of the furnace body 11 of the arc furnace 1. It has been. In FIG. 1, 14 is a furnace lid, 15 is a door that moves up and down to open and close the taphole, 16 is a water-cooled panel, and L is molten steel in the furnace body 11.

  The temperature measuring sampling device E includes a movable carriage 31 that can move back and forth (left and right direction in FIG. 1) on the fixed floor 2 with respect to the tap mouth 12, and an elevator device 32 is provided on the movable carriage 31. Yes. In the present embodiment, the movable carriage 31 and the lifting device 32 constitute a support mechanism. The elevating device 32 includes an elevating lifter 321 and a table 322 supported by the elevating lifter 321, and an inclined base 33 extending downwardly in the direction of the taphole 12 is provided on the table 322. The tilt table 33 is tilted so as to have a predetermined angle θ (for example, 30 ° or more) with respect to the molten steel surface (that is, a horizontal plane) in the furnace.

  A probe holding carriage 34 is provided on the inclined base 33 so as to be movable in the longitudinal direction along this direction, that is, in the front-rear direction with respect to the spout 12. A known rod-shaped temperature measuring probe 35 having a predetermined length protrudes from the probe holding carriage 34 in parallel to the inclined table 33 toward the tap hole 12.

  In the temperature measuring sampling apparatus having such a structure, the movable carriage 31 is appropriately moved back and forth on the fixed floor 2 with respect to the furnace body 11 of the horizontal arc furnace 1 and the lifting device 32 is lifted and lowered to an appropriate position. The inclined base 33 faces the spout 12 as shown in FIG. In this state, when the probe holding carriage 34 is moved in the direction of the tip along the inclined stage 33, the tip of the temperature measuring probe 35 protruding from the holding carriage 34 is immersed in the molten steel L in the furnace body 11 to measure the temperature. Is done. In this case, the temperature measuring probe 35 is made to enter at a predetermined angle θ with respect to the horizontal molten steel surface. Thereby, the problem that the temperature measurement probe 35 is flipped up by the resistance of the slag or the molten steel L and an appropriate immersion depth cannot be secured is avoided.

  When the furnace body 11 of the arc furnace 1 rolls forward on an unillustrated base, the outlet 12 of the furnace body moves forward (to the right in FIG. 2) by Lf as shown in FIG. Also move to Hf by Hf. Therefore, in this case, the movable carriage 31 is moved forward by the forward movement Lf of the furnace body, and the lifting device 32 is raised by the upward movement Hf of the furnace body 11. Thereby, even if the furnace body 11 tilts forward, the temperature measuring probe 35 is positioned in the vicinity of the tap hole 12.

  On the other hand, when the furnace body 11 tilts backward, the outlet 12 of the furnace body moves Lb backward (leftward in FIG. 3) as shown in FIG. 3, and simultaneously moves Hb downward. Therefore, in this case, the movable carriage 31 is retracted by the amount of backward movement Lb of the furnace body, and the lifting device 32 is lowered by the amount of downward movement Hb of the furnace body 11. Thereby, even if the furnace body 11 tilts backward, the temperature measuring probe 35 is positioned in the vicinity of the tap hole 12.

  In this way, even if the furnace body 11 rolls and changes its posture, the temperature measuring probe 35 can always be positioned in the vicinity of the spout 12 so as to follow it. Temperature measurement can be performed by reliably immersing the temperature measuring probe 35 in the molten steel L of the arc furnace 1.

  In the present embodiment, the position of the temperature measuring probe 35 may be adjusted by moving the probe holding carriage 34 back and forth with the elevating device 32 fixed in position without providing the moving carriage 31.

(Second Embodiment)
As shown in FIG. 4, a laser sensor 36 is provided on the probe holding carriage 34 and is directed to the rear surface of the furnace body 11. Other structures are the same as those in the first embodiment. According to this, it is known that when the lifting device 32 is moved up and down, when the reflected light from the furnace wall disappears, the probe holding carriage 34 faces the spout 12. Thus, if it is made to move the said trolley | bogie 34 toward the spout 12 after confirming that the probe holding | maintenance trolley 34 faced the spout 12, the temperature measuring probe 35 interferes with the spout 12. This can be surely prevented.

(Third embodiment)
In the present embodiment, the temperature measuring sampling device E is suspended from a portal frame 4 provided on the fixed floor 2 as shown in FIG. That is, in the temperature measuring sampling apparatus E, the rollers 511 (FIG. 6) provided at both ends of the traveling saddle 51 constituting this roll on the flange of the horizontal frame 41 made of H-shaped steel. Yes. The horizontal frame 41 is installed between the upper ends of the left and right vertical frames 42 of the portal frame 4.

  A fixed-length H-shaped steel rail member 52 is fixed to the lower surface of the traveling saddle 51 in a direction perpendicular to the horizontal frame 41, that is, in a longitudinal direction with respect to the spout 12 of the arc furnace 1. A running saddle 53 is provided so that rollers 531 (FIG. 5) at both ends are placed on the rail member 52, and movable along the rail member 52 in the front-rear direction and the front-rear direction.

  The traveling saddle 53 includes a circular upper half 532 provided with the roller 531, and a circular lower half 533 rotatable relative to the upper half 532 via a bearing 534. A guide shaft 54 having a predetermined length is suspended from the center of the lower surface. An elevating slider 55 is provided so as to be movable along the guide shaft 54.

  The elevating slider 55 is connected to the base end of an inclined table 56 that extends obliquely downward toward the taphole 12 of the arc furnace 1, and the inclined angle of the inclined table 56 can be changed by a drive mechanism (not shown). (The chain line in FIG. 6). A probe holding carriage 57 similar to that of the first embodiment is placed on the tilting table 56 so as to be movable along the tilting table 56. A temperature measuring probe 58 of a predetermined length is mounted on the tilting table from the front surface of the probe holding carriage 57. It protrudes toward the spout 12 parallel to 56. In this embodiment, the rail member 52, the guide shaft 54, and the elevating slider 55 constitute a support mechanism.

  According to the temperature measuring sampling device E having such a structure, the temperature measuring probe 58 can be immersed in the molten steel L in the furnace body 11 at different angles via the tap hole 12, and the temperature measuring probe 58 is Since the guide shaft 54 can be rotated in a horizontal plane, or the temperature measuring probe 58 can be moved not only in the front / rear / up / down direction but also in the left / right direction with respect to the spout 12, the furnace body 11 is first. As described in the embodiment, even if the tilting forward or backward tilting is performed, the molten steel L is more reliably passed through the spout 12 without causing the temperature measuring probe 58 to interfere with the spout 12 of the furnace body 11. It is possible to measure the temperature by immersing it inside, and when the temperature measuring sampling device is not used, it can be retracted to the side from the position facing the spout opening. According to this structure, it is possible to secure a large work space for the worker on the fixed floor as compared with the case where the mobile carriage as in the first embodiment is provided. This effect is further enhanced by retracting the temperature measuring sampling device.

  In this embodiment, the rail member 52 is supported by a suitable base, a normal traveling saddle not having a relative rotation structure is suspended from the rail member 52, and the guide shaft 54 is suspended from the traveling saddle so as to move up and down. When the slider 55 is mounted and the elevating slider 55 is provided with the tilt base 33 of the first embodiment having a constant tilt angle, a temperature measuring sampling device having substantially the same function as that of the first embodiment is realized. .

(Fourth embodiment)
In the arc furnace, the arc-shaped bottom wall of the furnace body is placed on a base as shown in FIG. 7, and can be tilted forward or backward. For example, when the furnace body rolls forward, the forward movement amount Lf and the upward movement amount Hf of the furnace body in each of the above embodiments can be calculated by the following expressions (1) and (2).
Lf = X−r × (cos α−cos (α−β)) (1)
Hf = r × (sin α−sin (α−β)) (2)
Here, X = 2R × 3.14 × β ÷ 360 (°) (3).

In the above formulas (1), (2), and (3), P, O, and O ′ represent the following points, and X, R, r, α, and β represent the following amounts. These points and amounts are shown in FIG. In addition, m in FIG. 7 is an approach line of the temperature measuring probe.
P: Measurement point (temperature probe passing point), O: Rolling center, O ′: Rolling center during forward movement, X: Forward distance of rolling center, R: Rolling radius, r: Measurement point (passing temperature probe) Point), α: Angle between rolling center and measurement point when horizontal, β: Tilt angle

  For the tilt angle β, a detection sensor is usually provided, and the amounts of R, r, and α are constant. Therefore, by detecting the tilt angle β of the furnace body 11 that has been tilted forward, the forward movement Lf and the upward movement Hf of the furnace body 11 can be calculated by the above equations (1) and (2). Therefore, a control device is provided, the movement angle Lf, Hf of the furnace body 11 is calculated based on the above equation using the tilt angle β as an input signal, and the moving carriage 31 as a support mechanism in the first embodiment, for example. The temperature measuring probe 35 can be made to automatically follow the forward tilting movement of the furnace body 11 by moving the lifting / lowering device 32 or the probe holding carriage 34 by a necessary amount. The same applies when the furnace body 11 tilts backward.

DESCRIPTION OF SYMBOLS 1 ... Arc furnace, 12 ... Outlet, 31 ... Moving cart, 32 ... Lifting device, 33 ... Inclined stand, 34 ... Probe holding cart, 35 ... Temperature measuring probe, 52 ... Rail member, 54 ... Guide shaft (guide member) ), 55 ... Elevating slider (elevating member), 56 ... Inclined base, 57 ... Probe holding carriage, 58 ... Temperature measuring probe.

Claims (5)

An inclined base extending in the direction of the outlet of the arc furnace, a probe holding carriage that holds a rod-shaped temperature measuring probe and is movable in the longitudinal direction along the inclined base, and the inclined base with respect to the outlet And a temperature measuring sampling device for an arc furnace provided with a support mechanism for supporting relative vertical movement. The temperature measuring sampling apparatus for an arc furnace according to claim 1, wherein the support mechanism supports the inclined base so as to be able to move back and forth further with respect to the tap hole. The said support mechanism is provided with the moving trolley which can be moved back and forth with respect to the taphole of an arc furnace, and the raising / lowering apparatus provided in the said moving trolley, The said inclination stand is provided in the said raising / lowering apparatus. 2. An arc furnace temperature measurement sampling apparatus according to 2. The support mechanism includes a guide shaft suspended from a rail member so as to be movable back and forth with respect to a tap hole of an arc furnace, and an elevating member mounted on the guide shaft so as to be movable up and down. The temperature measuring sampling apparatus for an arc furnace according to claim 2, wherein the tilting table is provided on the arc furnace. The measurement of the arc furnace according to any one of claims 2 to 4, further comprising a control device for inputting information on forward or backward tilting motion of the arc furnace and controlling the support mechanism and / or the probe holding carriage. Temperature sampling device.

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