JPH074864A - Fire lance drive - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fire lance drive device capable of automatically and favorably crushing a tap of a melting furnace. [Structure] Fire lance 6 whose tip is burned
When the fire lance 6 and the first and second clamping units 25 and 26 that clamp the slag and send it to the tap hole 2 of the melting furnace at a variable speed are pressed against the object made of the packing material 4 and the occluding material. And a load cell 33 for detecting a reaction force generated from the object. Then, according to the reaction force information detected by the load cell 33, the feed force of the fire lance 6 is controlled to decrease as the reaction force, that is, the pressing force of the fire lance 6 increases. Thereby, the distance between the tip of the fire lance 6 and the object can be made substantially constant, and the object can be crushed well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire lance drive device for pressing and crushing a combustion portion at the tip of a fire lance against an object.

[0002]

2. Description of the Related Art As shown in FIG. 7, at a taphole 2 at the beginning of operation in a melting furnace 1 for cupola or the like, a plug 3 made of slag, metal or the like is solidified and attached due to its continuous operation. Further, a filling material 4 such as coke powder is filled from the outside of the blocking material 3. Then, with a predetermined amount of molten metal stored in the melting furnace 1, the tap hole 2 is opened to discharge the molten metal. Reference numeral 5 is a refractory material forming the melting furnace 1.

To open the tap hole 2, a fire lance 6 which is made of a thin cylindrical iron wire material and whose tip is ignited is used. That is, the conventional fire lance 6
While oxygen is supplied to the inside of the fire lance, the worker uses a gas burner such as acetylene gas to ignite and burn the tip of the fire lance 6 while holding the base side of the fire lance 6 and manually eject the tip. By pressing against the sprue 2, the filling material 4 was blown away by the heat and force of the flame of the burning fire lance 6, and the blocking material 3 was melted and crushed to open the spout 2.

Since the filling material 4 is relatively soft,
While the material melts and burns at a high speed, the occluding material 3 is the filling material 4
It is harder than it and melts and burns at a slower rate. Also,
It is necessary to make the runner as large as possible in the occluding member 3. Therefore, when the tap hole 2 is opened, conventionally, the opening work is performed while changing the feeding condition of the fire lance 6 depending on the experience and experience of the worker.

[0005]

However, in the opening work described above, the tip of the fire lance 6 is burning at a high temperature.
And the worker had to hold it by hand,
After the opening, the high temperature molten metal flowed out, and the workers were forced to do heavy work and involved danger. As a means to solve this problem, it is conceivable to automate the opening work, but there is a problem of what kind of means can be used for automation, and at the time of automating such opening work, There is also a problem of how to discriminate the stuffing material 4 and the occluding material 3 of No. 2 and efficiently crush them.

The present invention solves the above problems, and an object of the present invention is to provide a fire lance drive device capable of automatically and favorably crushing the tap hole of a melting furnace.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is a fire lance driving device for pressing and crushing a combustion portion at the tip of a fire lance against an object to be crushed. A feeding device that feeds an object at a variable speed, a reaction force detection unit that detects a reaction force from the object when the fire lance is pressed against the object, and a reaction force detected by the reaction force detection unit. The control unit controls at least one of the feed direction and the feed amount of the fire lance based on the force information.

[0008]

In the above structure, the ignited fire lance is sent toward the object by the sending device, and the combustion portion at the tip of the fire lance is pressed against the object to be crushed. In this case, if the reaction force detected by the reaction force detection unit is large, it can be determined that the part where the tip of the fire lance is in contact has not been crushed yet. The object can be reliably crushed by lowering the value. Further, when the reaction force detected by the reaction force detection unit is small, it can be determined that the portion where the tip of the fire lance is in contact is almost crushed,
The feed rate of the fire lance can be increased to efficiently crush the object.

Further, even when the objects to be crushed are relatively soft such as stuffing material and easily crushed, and the materials to be relatively hard and difficult to crush are mixed, the pressing force to each object is increased. Then, the relatively soft and easily crushed object absorbs the pressing force inside the object even if the pressing force exceeds a certain level, and the reaction force does not increase. The fire lance can be sent at a speed suitable for each object based on the reaction force information.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 1 to 3, an inclined groove (metal dam) 12 communicating with the taphole 2 of the cupola at the same inclination angle is formed on the work floor 10, and a fire lance is formed along the inclined groove 12. A fire lance drive device 20 for sending 6 toward the tap hole 2 is arranged on the work floor 10.

The fire lance driving device 20 includes a supporting frame 21 placed on the work floor 10, an inclined frame 22 supported by being inclined by the supporting frame 21, and a tap hole of the inclined frame 22. 11 side (hereinafter, the right side in FIG. 1 which is the tap hole 11 side of the inclined frame 22 is referred to as the front side, and the left side is referred to as the rear side)
An imaging camera 23 attached to the upper part of the fire lance 6 for photographing the situation of opening work of the tap hole 2 by the fire lance 6, and an ignition device for the fire lance 6 extending downward from the front side of the tilt frame 22 into the tilt groove 12. 24 and the first and second feeding devices that are movable along the inclined upper surface of the inclined frame 22 and that are hung diagonally downward orthogonal to the inclined frame 22 and that send out the fire lance 6.
Of the holding units 25 and 26, the driving unit 27 mounted on the support frame 21, and the connecting frame that is arranged in parallel with the inclined frame 22 and connects the lower portions of the first and second holding units 25 and 26. 28 and connecting frame 28
A length measuring roller 29 attached to the rear end of the length measuring roller 29 for slidingly contacting the fire lance 6 with its own weight to measure the feed length of the fire lance 6, and a rotary encoder 31 linked to the length measuring roller 29 via a belt 30. And a load cell 33 as a reaction force detecting portion which is arranged behind the connecting frame 28 and detects a reaction force acting on the fire lance 6.
And a control unit (not shown) for controlling the fire lance drive device 20.

The inclined frame 22 is a support frame 21.
A horizontal shaft 37 is provided by a rear erected arm 36 erected at the rear of the
Is swingably supported via a vertical position adjusting portion 39 and a horizontal shaft 40 by a front standing arm 38 standing on the front portion of the support frame 21. ing. Then, the vertical position of the front end of the tilt frame 22 is adjusted by the vertical position adjuster 39, so that the tilt frame 22 is disposed substantially along the tilt groove 12.

The rolling roller 4 is provided on the upper surface of the inclined frame 22.
1, 42 are rotatably mounted on the rolling rollers 41,
The first and second holding units 25 and 26 and the connecting frame 28 are supported by 42 along the inclined surface of the inclined frame 22 so as to be rotatable. The connecting frame 28
The position of the front end of the tilted frame 22 is regulated by a stopper 43 fixed to the lower surface of the front of the tilted frame 22.
Second holding units 25, 26 and connecting frame 28
Is movable rearward from the position where it abuts against the stopper portion 43. The rearward force of the first and second holding units 25 and 26 and the connecting frame 28 acts on the load cell 33.

As shown in FIG. 3, the first holding unit 2
5, a pair of drive shafts 45 are rotatably supported, and drive rollers 46 that rotate at positions along one surface of the fire lance 6 are attached to the lower ends of the drive shafts 45. As shown in FIG. 2, the upper ends of both drive shafts 45 have second and third gears 48 and 49 meshed with a first gear 47.
And the first gear 47 is attached to the support frame 21.
By the motor 50 of the drive unit 27 arranged in
It is driven via a two-stage clutch 51 and a miter gear box 52. That is, the rotation of the motor 50 is transmitted to both drive rollers 46 via the plurality of chains 53, the two-stage clutch 51, and the like. Here, the rotation detector 34 that detects the rotation state of the motor 50 is connected to the other of the two-stage clutch 51. Although not shown, the driven shaft and the driven roller are also rotatably attached to the second holding unit 26, but no driving force is applied to the driven shaft and the driven roller.

In the first and second holding units 25 and 26, the first to the first are provided via the horizontal pin 54 (see FIG. 3).
Third swing arms 55, 56, 57 are swingably supported, and nipping rollers 58, 59 are rotatably attached to the lower ends of the first and third swing arms 55, 57. Further, the upper end portions of the first to third swing arms 55, 56, 57 have first to third air cylinder devices 60, 61, 6 respectively.
The first and third air cylinder devices 60 and 62 are connected to the retractable rod 2 to operate the holding roller 58 and 59 in cooperation with the driving roller 46 and the driven roller and the fire lance 6. It is designed to be clamped or separated.

The lower end of the second swing arm 56 can be brought into contact with the tip of the fire lance 6, and the lower end of the second swing arm 56 can block the delivery path of the fire lance 6. It is like this.

Further, in the ignition device 24, as shown in FIGS. 4 and 5, the torch 66 connected to the plasma generator 65 is attached to the centering plate 67, and the tip of the centering plate 67 is attached. Is formed with a V-shaped groove 68. The fire lance 6 is guided and fitted into the V-shaped groove 68, and the centering plate 67 is moved up and down by an elevating mechanism 70 having an elevating air cylinder device 69 and the like.

Next, the operation of the fire lance driving device having the above structure will be described. First, the retractable rod of the second air cylinder device 61 is extended to move the second swing arm 5
With the lower end of the fire lance 6 blocking the delivery path of the fire lance 6, the push-out rod of the first air cylinder device 60 is extended and the tip of the fire lance 6 is held by the holding roller 58. Then, the motor 50 is driven to rotate both drive rollers 46 forward, and the fire lance 6 is
It is fed forward until its tip comes into contact with the lower end of the second swing arm 56. Here, with the position of the fire lance 6 in a state where the tip of the fire lance 6 is in contact with the lower end of the second swing arm 56, the value of the rotary encoder 31 that is interlocked with the length measurement roller 29 is defined as 0 point (origin). Is stored in the control unit side.

Next, the fire lance 6 is sent out from the zero point position for a predetermined distance and moved to a position below the ignition device 24. The feed distance of the fire lance 6 is constantly measured by the length measuring roller 29 and the rotary encoder 31, and the feed distance from the zero point position of the fire lance 6 can be detected from the output value of the rotary encoder 31. Has become. Also, Fire Lance 6
Of the second clamping unit 26 when the tip of the
The third air cylinder device 6 when moved to the lower part of the
The push-out rod 2 is extended and pinched by the pinching roller 59 of the third swing arm 57, and the fire lance 6 is pinched by the driven roller in addition to the drive roller 46.

After that, when the fire lance 6 is sent below the ignition device 24, the feeding operation of the fire lance 6 is temporarily stopped. Then, the torch 66 is lowered together with the centering plate 67 by the elevating mechanism section 70, the fire lance 6 is fitted into the V-shaped groove 68 of the centering plate 67, and then the plasma generator 65 is operated to operate the torch 66. Plasma is generated from the fire igniting the fire lance 6. Fire Lance 6
Is the torch 6 by the V-shaped groove 68 of the centering plate 67.
Since the ignition is performed in a posture in which the fire lance 6 is held at a position separated from the tip end portion of the fired member 6 by a predetermined distance, the ignition operation of the fire lance 6 is favorably performed. In addition, oxygen is supplied into the fire lance 6 before ignition.

After ignition, the fire lance 6 is sent out toward the taphole 2 of the cupola, and when the fired fire lance 6 comes into contact with the object made of the filling material 4 and the blocking material 3 of the taphole 2, the fire lance 6 is fired. The lance 6 and the first and second holding units 25 and 26 holding the fire lance 6 receive a reaction force equivalent to the pressing force against the target object from the target object, and the load cell 33 constantly applies the reaction force. To be detected.

Here, after the fire lance 6 comes into contact with the object, the fire lance 6 is controlled so as to repeat the reciprocating motion back and forth with respect to the object. That is,
By reciprocating the fire lance 6 back and forth, it is possible to prevent the fire lance 6 from becoming entangled and stopped due to the slag of the melted blocker 1 or the fire lance 6 itself. Then, when the fire lance 6 moves forward, when the reaction force from the object based on the pressing force of the fire lance 6 increases, the fire lance 6 is fed out while feedback control is performed so that the feeding speed decreases. That is, when the distance between the tip of the fire lance 6 and the target object becomes 0 and the pressing force increases, the feed rate is brought close to 0, the target object is melted, and the distance to the target object increases. On the contrary, when the distance between the tip of the fire lance 6 and the target object increases and the pressing force decreases, the feed speed increases and the distance to the target object decreases. Thereby, the distance between the tip of the fire lance 6 and the object is made constant, and the object can be crushed well.

When the fire lance 6 is sent out against the reaction force from the packing material 4 during forward movement, as shown in FIG. 6, when a predetermined pressing force, for example, 20 kgf / cm ² or more is applied. Since the filling material 2 is relatively soft, it is crushed and the reaction force is reduced. When the decrease in the reaction force is detected in this way, it is determined that the object is the filling material 4, and the fire lance 6 is retracted. Fire Lance 6 as well
The packing material 4 is crushed by repeating the reciprocating motion before and after the above.

The fire lance 6 is further sent out,
When the tip reaches the occluding member 3, the occluding member 3 is hard and is not crushed even when the above-mentioned predetermined pressing force, for example, a pressing force of about 20 kgf / cm ² is applied. Power also increases. Therefore,
In this way, when the reaction force greatly exceeds, for example, 20 kgf / cm ² , it is judged that the tip of the fire lance 6 has reached the blocking member 3, and the feeding speed is slowed. That is, when opening the filling material 4, for example, it is moved back and forth at a maximum speed of 50 to 100 mm / sec with a pressing force of 10 to ²⁰ kgf / cm ² , while when opening the blocking material 3, for example, 20 to 50 mm.
It is moved back and forth at a maximum speed of 10 to 20 mm / sec with a pressing force of kgf / cm ² .

In this way, the packing material 4 can be burnt and blown away by the heat and momentum of the flame of the fire lance 6, and the occluding material 3 can be crushed by the heat and pressing force of the flame of the fire lance 6. As a result, the packing material 4 and the blocking material 3 can be efficiently crushed and opened.

When the tap hole 2 is opened, the reaction force against the fire lance 6 becomes zero, so the fire lance 6
And the fire lance driving device 20 is lifted together with the support frame 21 to move the length measuring roller 29.
The first and second clamping units 25 and 26 are pulled up and retracted from the inclined groove 12.

The fire lance 6 at the time of opening work
Since the state and the state of the tap 2 are also confirmed by being imaged by the imaging camera 23, it is also possible to perform the sending operation of the fire lance 6 while watching the state of the tap 2 through the imaging camera 23.

Further, in the above embodiment, the case where the above-mentioned fire lance driving device is used for the opening work of the tap hole of the melting furnace is shown, but it is needless to say that it can be used for the crushing work of other objects. Nor.

[0030]

As described above, according to the present invention, a reaction force detecting section for detecting a reaction force from the object generated when the fire lance is pressed against the object is provided, and based on this reaction force information. By configuring to control at least one of the feed direction or the feed amount of the fire lance, it is possible to perform a fire lance feed operation suitable for that state while estimating the melting condition of the object, The tap of the melting furnace can be crushed automatically and satisfactorily. Even when the object is relatively soft and easily melted, such as a filling material, and relatively hard and hard to dissolve, the object is determined based on the reaction force information. It is possible to send a fire lance at a speed suitable for each object from the reaction force information,
The work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a fire lance driving device according to an embodiment of the present invention.

FIG. 2 is a plan view of the fire lance driving device.

FIG. 3 is a side view of the fire lance driving device.

FIG. 4 is a diagram showing a configuration of an ignition device of the fire lance driving device.

FIG. 5 is a front view of the ignition device.

FIG. 6 is a diagram showing changes in the pressing force (reaction force) of the fire lance of the fire lance driving device.

FIG. 7 is a sectional view showing the vicinity of a tap hole of the melting furnace.

[Explanation of symbols]

 1 Melting Furnace 2 Outlet Port 3 Closing Material 4 Filling Material 6 Fire Lance 10 Work Floor 20 Fire Lance Driving Device 22 Tilt Frame 23 Imaging Camera 24 Ignition Device 25 First Clamping Unit 26 Second Clamping Unit 28 Connection Frame 29 Measuring Length Roller 31 Rotary encoder 33 Load cell (reaction force detection unit) 34 Motor 41, 42 Rolling roller 50 Reducer 55 First swing arm 56 Second swing arm 57 Third swing arm 58, 59 Clamping roller 65 plasma generator 66 torch 67 centering plate 68 V-shaped groove 70 lifting mechanism

Claims (1)

[Claims] 1. A fire lance driving device that presses a combustion portion at the tip of a fire lance against an object to melt and crush it, and a sending device that sends the fire lance to the object at a variable speed, and a fire lance. Of the fire lance feed direction or feed amount based on the reaction force information detected by the reaction force detection unit that detects the reaction force from the object that occurs when the object is pressed against A fire lance drive device comprising: a control unit for controlling at least one of the two.