JP3119344B2 - Converter lance centering method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for aligning a lance of a converter, which can easily, quickly and accurately align the lance when replacing the lance of an upper blowing converter.

[0002]

2. Description of the Related Art As is well known, the blowing lance of an upper blowing converter is
It is indispensable to replace it because it will be damaged due to adhesion of molten steel or thermal damage during operation, so one converter is always equipped with a spare lance, and it is necessary to exchange the spare lance during blowing. Even if a replacement is needed, it can be immediately replaced with a spare lance.

As shown in FIG. 7, the blowing lance equipment of the upper blowing converter is provided with two lance lift trucks 12 supported so as to be lifted and lowered along a lift guide 13, and each truck fixes the lance 11. A converter lance elevating and lowering supporting device which is provided with a lance holding device 14 and one of which is used as a spare lance is generally used. Note that 15
Is a cone, 16 is a cone receiving stopper, 17 is a converter, 1
8 is a converter lance hole and 19 is a gas recovery hood.

In this type of converter lance lifting / lowering support device, one lance lifting / lowering vehicle 12 performs blowing, and the other lance lifting / lowering vehicle 12 holds a standby lance and stands by. If it becomes damaged and needs to be replaced,
Immediately after the lance lift truck 12 holding the damaged lance is pulled up and moved to a predetermined position, the other lance lift truck 12 holding the spare lance is moved to the operating position to replace the lance. I have.

In order for the refining operation to be performed normally in the converter refining, it is necessary to align the blowing lance 11 so that the blowing lance 11 is arranged exactly perpendicularly to the center of the lance hole 18. Usually, this operation has been performed by adjusting the position of the lance gripping device 14 while visually checking the tip of the lance near the lance hole 18 when inserting the lance before the operation of the converter, but the centering operation is not performed. Since the operation is interrupted, the productivity is inevitably reduced. In addition, since the operation is performed manually, it requires a large amount of labor and time, and is a dangerous operation.

Accordingly, as a countermeasure, Japanese Patent Publication No.
No. 3,327,643 discloses a lance 1 as shown in FIG.
A ring-shaped fitting 21 having a spherical surface is attached to a flange 20 fixed to the lance 1, and the lance 11 is supported by a spherical seat 22 provided on the lance lifting carriage 12 side so as to be tiltable in the radial direction by receiving the fitting 21 and the lance is gripped. There has been proposed a lance centering device capable of correcting the inclination of the lance at the position of the device 14. In this device, the lance and the lift truck are supported by a metal fitting having a spherical surface and a spherical seat, so that when the lance is mounted, the contact resistance of the sliding portion is small, and the inclination of the lance is corrected by applying only a small force. It has the effect of being able to do so, but in order to obtain such an effect, it is necessary that the lance be straight without any bending.

However, since the lances have a unique bend due to thermal deformation or the like in normal use for a long period of time, even if centering (centering) is performed at the lance gripping position, the core at the tip of the lance is not necessarily the converter lance hole. There is a drawback that it does not always match 18. In addition, the lance holding device 14
Has only the function of clamping the lance,
Since it does not have a function to incline the lance, the inclination correction work of the lance must be performed manually while checking it visually as described above. Although there is an advantage that the centering operation can be performed, it cannot be said that the centering operation time can be greatly reduced.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. Even if the lance is bent due to thermal deformation or the like, the lance can be held at a high precision by the lance gripping position. An object of the present invention is to propose a converter lance centering method and apparatus capable of performing centering automatically and automatically, accurately and easily centering the lance at the time of lance replacement by automating the centering.

[0009]

SUMMARY OF THE INVENTION A converter lance centering method according to the present invention is provided with a lance elevating vehicle, a lance centering mechanism using a spherical surface, and automatically correcting the inclination of the lance. A lance centering method for a converter lance elevating and lowering supporting device provided with a lance gripping device having a function capable of performing lance centering while measuring a distance between the lance and a lance center measuring sensor installed on the lance elevating vehicle. Performing center alignment with the converter lance hole, electronically recording the measured value of the lance core measuring sensor at that time, and controlling each lance gripping device based on the measured value when replacing the lance. I do.

Further, as an apparatus for carrying out the method of the present invention, a lance lifting / lowering vehicle is provided with a lance centering mechanism using a spherical surface, and the inclination of the lance is automatically adjusted by the power of a motor or a fluid pressure cylinder. A converter lance lifting / lowering support device provided with a lance gripping device having a function that can be corrected, a lance core measuring sensor for centering a lance core and a converter lance hole on the lance lifting carriage, An automatic recording control device that records a sensor measurement value and controls each lance gripping device based on the measurement value, and the lance core measurement sensor has a 90-degree interval around the lance. Alternatively, the sensors should be arranged concentrically with the vertical center line of the lance at an interval of 120 degrees, and each sensor should be fixed on the same horizontal plane on the lance lift truck. The lance gripping device further comprises a clamp claw that moves back and forth by a forward and backward movement mechanism using a fluid pressure cylinder or a motor as a driving source, with a vertical center line of the lance at an interval of 120 degrees around the lance. The three pawls are independently arranged concentrically, and each pawl is fixed on the same horizontal plane of the lance lift truck, and the pawls are automatically recorded by the automatic recording control device based on the sensor measurement values recorded on the lance lead measuring sensor. Has a mechanism for moving the lance forward and backward, and has a function of centering and fixing the lance.

[0011]

According to the present invention, the center displacement between the tip of the lance and the converter lance hole, which can be tilted by the lance centering mechanism utilizing a spherical surface, is zero on the lance lifter, that is, the tip of the lance and the converter The lance is centered by a lance gripping device having a function of automatically correcting the inclination of the lance so that the center of the lance coincides with the center of the lance, and the center of the tip of the lance and the converter lance hole is adjusted. By electrically recording the distance measurement value with the lance of each lance center measurement sensor when the lance coincides, in the lance center alignment such as a spare lance at the time of subsequent lance exchange, the distance measurement value The lance gripping device can be controlled by the automatic recording control device so that the lance can be aligned.

Further, even when the lance is bent due to thermal deformation or the like due to long-term use, the center displacement between the tip of the lance mounted on the lance lifting carriage and the converter lance hole becomes zero. The lance alignment is performed by the lance gripping device, and the measured value of each lance core measurement sensor at that time is recorded, so that the alignment of the bent lance is also performed by the automatic recording control device. Can be controlled to align the lance. The amount of bending of the lance may vary slightly depending on the lance. In such a case, the previously measured sensor measurement value may be slightly corrected to control the lance gripping device.

In the apparatus of the present invention, since the lance is mounted on the lance lifting carriage so as to move in the radial direction with the spherical seat as a fulcrum, the clamp claw of the lance gripping device is selected and moved back and forth according to the inclination of the lance. This facilitates the alignment of the lance. Further, the lance can be fixed at that position by advancing the three clamp claws when the alignment of the lance is completed.

Further, the automatic recording control device of the present invention records the value measured by the lance core measuring sensor when the center of the lance tip and the center of the converter lance hole coincide with each other, and records the next lance set. At this time, it has a control function of selecting and operating each of the clamp claws of the lance gripping device so as to have the same value as the measured value. For example, an amplifier control panel or the like can be used.

According to the present invention, the lance alignment work is automated so as to be able to cope with a lance that has been bent due to thermal deformation or the like. Moreover, it can be performed accurately. Therefore, the operation time for replacing the lance such as a spare lance can be greatly reduced.

[0016]

1 is a side view showing an embodiment of a converter lance centering device according to the present invention, FIG. 2 is a plan view showing a lance holding device in the same centering device, and FIG. FIG. 4 is a plan view showing another embodiment of the apparatus, FIG. 4 is a plan view showing the relative positional relationship between the lance core measuring sensor and the lance in the centering apparatus, and FIG. FIG. 6 is a plan view showing another embodiment of the relative positional relationship, and FIG. 6 is an explanatory view showing the principle of lance alignment in the above-described alignment apparatus. Is a lance gripping device, 5 is a lance center measuring sensor, 6 is an automatic recording control device, and 7 is a lance centering mechanism.

The lance lift truck 2 is supported so as to move up and down along a lift guide 3 as in the prior art. The lance centering mechanism 7 includes a flange 7-1 fixed to the lance 1.
A ring-shaped metal fitting 7-2 having a spherical surface is attached to the lance.
2, the lance 1 is supported so as to be tiltable in the radial direction. The lance 1 is supported on the upper side of the lift truck 2 through a U-shaped groove 2-1 having a larger diameter than a lance formed on the same vertical center line as the spherical seat 7-3.

The lance gripping device 4 shown in FIG. 2 is such that a cylinder 4-1 having a clamp claw 4-2 attached to the tip of a rod fits into a U-groove 2-1 formed in the lance lift truck 2. 1 and is fixed on the carriage at an interval of 120 degrees on a concentric circle with the vertical center line of
By moving the clamp claw 4-2 back and forth by means of 1, the inclination of the lance 1 can be corrected (centering) and grasped (fixed). Further, the lance gripping device 4 shown in FIG.
Is a reversible motor 4-1 instead of the cylinder 4-1.
In this case, the screw rod 4-4 moves back and forth via a speed reducer 4-3 directly connected to the motor, and is attached to the tip of the screw rod 4-4. The lance can be centered and fixed by the clamp claws 4-2.

The lance center measuring sensor 5 is provided between the lance gripping device 4 and the lance centering mechanism 7 as shown in FIG.
4 are spaced at 90 degrees in FIG. 4 and 120 degrees in FIG. 5 on a concentric circle with the vertical center line of the lance 1 fitted in the groove 2-1. It is attached to the center (core) of the device. In addition,
As the lance core measuring sensor, a non-contact type displacement meter (ultrasonic, overcurrent type, laser type, etc.) is used.

The automatic recording control device 6, as described above,
The measured value of the lance core measuring sensor 5 when the center of the lance 1 and the center of the converter lance hole 18 coincide with each other is recorded, and the same value as the measured value is obtained at the next lance setting. Each clamp claw 4 of the lance gripping device 4
2 has a control function of operating it selectively, and an amplifier control panel is generally used.

The installation environment of the lance core measuring sensor 5 and the automatic recording control device 6 is a temperature environment of about 60 ° C., so that there is almost no thermal effect. It is preferable to take measures against dust for protection.

In the centering device having the above structure, the lance 1
Denotes a spherical seat 7-3 provided on the side of the lifting carriage, and a metal fitting 7 on the ring.
-2, the spherical seat 7-3 is supported on a lifting and lowering vehicle so as to be tiltable in the radial direction about a fulcrum, and the lance gripping device 4 is arranged so that the tip of the lance 1 and the converter lance hole coincide with each other.
Control and fix. At this time, the distances a and b from the lance 1 are measured by the lance core measuring sensor 5 attached to the lance lift truck 2 and input to the automatic recording control device 6. When replacing the lance, the distances a and b when the next lance is mounted on the lift truck are measured, and the lance gripping device is set so that the values become the distances a and b previously input to the automatic recording control device 6. 4 is controlled. Therefore, centering can be performed simply, quickly and accurately.

When the lance is replaced by a lance which is bent due to thermal deformation or the like, the tip of the lance 1 and the converter lance hole are shifted by x amount as shown in FIG. 6 when the lance is mounted on the lift truck. In this case, the distance x between the center misalignment amount x and the lance center measurement sensor 5 attached to the lance lift truck 2
Geometrically corresponds to 1: 1. Therefore, by correcting the inclination of the distance a of the lance core measuring sensor 5 so that x = 0, the axis of the lance tip and the converter lance hole 18 Will match. Therefore, the distances a and b measured by the lance core measuring sensor 5 at this time are
Is input to the automatic recording control device 6, and when the lance is replaced with a bent lance, by controlling the lance gripping device 4 so that the distances a and b previously input are obtained, The tip of the lance 1 and the converter lance hole can be matched. However, the bending of the lance due to thermal deformation or the like is not always constant and may vary slightly depending on the lance. In such a case, the sensor measurement values a and b previously recorded are slightly corrected to control the lance gripping device 4. By doing so, the alignment can be performed easily and accurately.

[0024]

As described above, according to the present invention, the centering operation of the lance can be automated, and the centering of the lance which is bent due to thermal deformation or the like can be performed automatically. Alignment when mounted on the lifting trolley can be performed simply, quickly and accurately. Therefore, the work time for replacing the lances such as the spare lances can be significantly reduced, and this has a great effect on improving the productivity of the converter and saving labor.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a converter lance centering apparatus according to the present invention.

FIG. 2 is a plan view showing a lance gripping device in the centering device according to the first embodiment.

FIG. 3 is a plan view showing another embodiment of the lance holding device.

FIG. 4 is a plan view showing a relative positional relationship between a lance core measuring sensor and a lance in the centering device of the same.

FIG. 5 is a plan view showing another embodiment of the relative positional relationship between the lance core measuring sensor and the lance.

FIG. 6 is an explanatory view showing the principle of lance centering in the centering device of the above.

FIG. 7 is a side view showing a conventional general converter lance lifting and lowering support device.

FIG. 8 is a longitudinal sectional side view of a main part showing an example of a conventional lance centering device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lance 2 lance lifting carriage 3 lifting guide 4 lance gripping device 5 lance center measurement sensor 6 automatic recording control device 7 lance centering mechanism

Continuation of the front page (56) References JP-A-50-97504 (JP, A) JP-A-1-169939 (JP, A) JP-A-5-200649 (JP, A) Jpn. , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) C21C 5 / 46,7 / 00 B23Q 15 / 22,17 / 22 G01B 21/20 F16C 32/04

Claims (4)

(57) [Claims] 1. A converter lance lifting and lowering support device having a lance centering mechanism using a spherical surface and a lance holding device having a function of automatically correcting the inclination of the lance. A lance center alignment method, wherein the lance center and the converter lance hole are centered while measuring the distance to the lance with a lance center measurement sensor installed on the lance lift truck, and the lance center measurement at that time is performed. A method of centering a converter lance, wherein a measured value of a sensor is electrically recorded and each lance gripping device is controlled based on the measured value when the lance is replaced. 2. A lance holding device having a lance centering mechanism using a spherical surface and having a function of automatically correcting the inclination of the lance by the power of a motor or a fluid pressure cylinder. In the converter lance elevating and lowering supporting device provided, a lance core measuring sensor for centering a lance core and a converter lance hole on the lance elevating vehicle, and a measured value of the sensor is recorded and based on the measured value. And an automatic recording control device for controlling each lance holding device. 3. The sensor for measuring the lance core is disposed concentrically with the vertical center line of the lance at intervals of 90 degrees or 120 degrees around the lance, and each sensor is located on the same horizontal plane as the lance lift truck. 3. The centering device for a converter lance according to claim 2, wherein the centering device is fixed on the upper side. 4. The lance gripping device includes a clamp claw, which is moved back and forth by a back and forth movement mechanism driven by a fluid pressure cylinder or a motor, and is concentric with the vertical center line of the lance at an interval of 120 degrees around the lance. And three pawls are fixed independently on the same horizontal plane of the lance lift truck, and each pawl is moved back and forth by an automatic recording control device based on the sensor measurement values recorded on the lance lead measuring sensor. 4. A converter lance centering apparatus according to claim 2, wherein the apparatus does not have a moving mechanism and has a function of centering and fixing the lance.