JP2581511B2 - Blast furnace spray repair equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for repairing a blast furnace shaft lining, which has been damaged by heat, by spraying a spraying material onto the lining, and in particular, by automatically and continuously discharging a large amount of the spraying material. The present invention relates to a double-tank type spray repair device for quickly repairing a required portion.

[0002]

2. Description of the Related Art Recently, the size of blast furnaces has been gradually increased, and today, large blast furnaces of 4000 to 5000 cubic meters are operating. The life of the furnace has been gradually increased due to the improvement of the refractory in the furnace itself. However, the blast furnace is inevitably damaged by its use, and particularly the shaft portion is severely eroded. Therefore, in order to further extend the life of the blast furnace and perform an efficient operation, it is necessary to repair the damaged portion of the shaft portion by means such as spraying.

[0003] In order to meet such a demand, various types of blast furnace repair apparatuses have been announced. Then
The most commonly used one is shown in FIG. The blast furnace spray repairing apparatus 1 includes a hopper 3 for receiving a spray material filled in a bag 2 carried by a forklift or the like, and a primary spraying device 5 for spraying the spray material from the hopper 3 while feeding the spray material by a feeder 4. Pre-dampener-6 for kneading added water
And a spraying machine 7 for receiving the spraying material pre-adjusted by the pre-dampener 6, and a blast furnace automatic spraying machine in which the blowing material accommodated in the spraying machine 7 is disposed inside the blast furnace 9 by using a material hose 8 or the like. And air transport means 11 for transporting air to the machine 10.

[0004] The spraying machine 7 used here includes:
As shown in FIG. 4 (A), for example, a torquelet type double structure chamber type spraying machine in which two upper and lower chambers are respectively opened and closed by a one-way valve and a material is supplied from a lower chamber, For example, as shown in FIG. 4C, a rotor-type spraying machine that supplies a material while rotating a rotor having a plurality of passages penetrating in a vertical direction around a vertical axis, for example, as shown in FIG. 2. Description of the Related Art A blade gun type spraying machine with a rotary feeder for supplying a material while rotating a rotary having a pair of grooves extending in a horizontal direction around a horizontal axis is widely used. In such a repair device 1, when the cement powder-like spraying material passes through the pre-damper 6, it is continuously supplied to the spraying machine 7 in a state where the primary additive water is added, and the spraying material thus supplied is The air blows through a valve, a rotor, a rotary or the like in the spraying machine 7 and is blown by a high-pressure means 11 including an air compression means such as an air compressor and a compressed air conveying means such as an air hose for conveying the compressed air generated thereby. From the blast furnace 7 via a material hose 8 to a blast furnace automatic spraying machine 10 arranged in a blast furnace 9, where the material is further kneaded with a predetermined amount of water. The nozzle is sprayed from the nozzle onto the melted shaft portion of the blast furnace 9, and thus predetermined repair is performed. Such repair work is continuously performed from the start of spraying to the completion of spraying after the spraying material is charged into the hopper 3, and the work is performed by an operator at the upper part of the shaft portion of the blast furnace 9. It is performed by remote control while looking at the inside from 12. In such a known spray repair device 1, the repair work is performed while predicting the repair location and the erosion state in advance and continuously filling the hopper 3 with the repair material in an amount necessary for the repair. .

[0005]

However, it is necessary to stop the operation of the blast furnace to perform such a spray repair work. Therefore, in consideration of the working efficiency of the blast furnace, the spray repair work is completed in as short a time as possible. It is desirable to do. Nevertheless, the repair material discharge capacity of the conventional blast furnace spray repair apparatus 1 is about 5 to 7 tons per hour, and the capacity for repairing a recent large blast furnace is very small. The spray repair time was longer and the blast furnace outage time was accordingly longer. For this reason, there has been a demand for a blast furnace spray repair apparatus having a discharge spray rate of about 10 to 20 tons or more per hour.

Further, in the conventional blast furnace spray repair device,
In the pre-dampener 6, the primary addition water is kneaded by the spraying means 5 into the cement powder-like repair material. Therefore, the repair material starts to solidify from that point. Therefore, it is desirable to supply the repair material in which the primary additive water has been kneaded as quickly as possible to the maintenance location of the blast furnace. However, valves, rotors, rotaries and the like as described above are arranged inside the spraying machine 7 to ensure a uniform supply of the repair material. However, the torquelet type double structure chamber type device has a double chamber opened by the action of the valve, so it is suitable for small volume discharge, but is not suitable for large volume discharge. There is a disadvantage that skill is required for such operations. Also,
In the rotor type and the rotary type device, the rubber sealing material provided around the rotor and the rotary during the spraying operation is easily worn and needs to be replaced periodically.
There is a drawback that the work often needs to be interrupted, there are many consumable parts, and the running cost is extremely high. Also,
The spray discharge amount is at most about 7 tons / hour in actual value at the maximum, and does not reach the required 10 to 20 tons / hour. Further, in the operation of the spraying machine, a high level of skill is required for controlling the discharge pressure and the discharge amount.

Further, in the conventional apparatuses, the spraying machine 7
In order to prevent the generation of dust on the side and increase the amount of material discharged, a pre-damper 6 for kneading the primary additive water into the repair material when the repair material is charged into the spraying machine is indispensable. Has frequently adhered and solidified inside the apparatus, and cleaning has often necessitated interruption of repair work. Therefore, the repair equipment 1
In this case, it is necessary to always prepare two pre-dampeners 6 and spraying machines 7, and a work procedure of cleaning one while using the other is required. However, such a procedure was not favorable in terms of space and economy.

Further, in the conventional apparatus, the spraying material powder as a repair material is conveyed under an open cycle and refilled into the hopper 3. For this reason, a large amount of dust and the like are generated in the surrounding area, and the working environment is significantly deteriorated. Particularly, when the operation is continued for a long time, there has been a very serious problem on the health of the operator.

[0009]

According to the present invention, in order to solve the above-mentioned various problems, a plurality of spraying machines are provided in conjunction with each other so that a large amount of repair material can be continuously supplied.
In addition, the material transfer cycle was completely closed, minimizing contamination of the working environment. In addition, the use of a pre-damper is unnecessary, and the kneading operation using the primary added water is eliminated, and the clogging of the apparatus due to solidification of the material and the necessity of replacing parts are minimized. Furthermore, all the operations of the entire apparatus are incorporated into a predetermined program, and the operation to be performed by the operator is made very easy.

[0010]

As a result, the present invention has the ability to discharge a large amount of repair material capable of completing repair of a large blast furnace in a short time. Further, since the spraying material powder is transferred only in the closed cycle, the surrounding environment is not contaminated by dust of the material powder. Furthermore, since the pre-dumper is not required, there is no fear that the material solidifies before reaching the blast furnace, and the amount, transfer speed, feed pressure, etc. can be strictly controlled, and at the same time, the equipment Problems such as clogging and wear of parts can be completely eliminated. Furthermore, since all the operation procedures are programmed, the operation of the operator can be significantly simplified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall explanatory view of the present invention, corresponding to FIG. 3, and FIG. 2 is a partially enlarged view of the present invention.

The blast furnace spray repair device 20 according to the present invention.
Is, for example, an I-beam for a hoist, as shown in FIG.
A plurality (only two are shown in FIG. 1) of a blasting material charging hopper 28 for receiving a powdery blasting material filled in a bag 26 carried by an electric hoist 24 with a trolley via A spraying machine 30 arranged on the side, and a material hose 36 for feeding the spraying material from the spraying machine 30 to the automatic spraying machine 34 in the blast furnace 32 in a powder state;
And a pneumatic conveying means 38 for supplying powder from the hopper 28 via a hose 36.

Although the blast furnace spray repairing apparatus 20 comprises two hoppers 28 and a spraying machine 30 in the illustrated embodiment, it is apparent to those skilled in the art that these are not limited to two. .

The structure and operation of the device of the present invention will be described below. Desirably, the capacity of each sprayer 30 will generally have a furnace material capacity of at least 2 tons. The spray material is thrown into the hopper 28 by the hoist 24. At this time, the bag 26, which is a flexible container storing the spraying material, is desirably automatically opened by a flexible container cutter 40 stored in a hopper 28 as shown in FIG. At the lower part of the hopper 28, a spraying machine main body or furnace material tank 44 having a butterfly valve 42 with an actuator for adjusting the material supply at a neck and an automatic exhaust valve 45 with an actuator communicating with the inside at a shoulder. It is provided. Therefore, the spray material loaded into the hopper 28 opens the exhaust valve 45 and opens the butterfly valve 42 with the actuator to release the furnace material tank 4.
It is dropped into 4. After this charging, the actuator-equipped butterfly valve 42 and the actuator-equipped automatic exhaust valve 45 for discharging air from the tank 44 are closed. This completes the preparation work. It is preferable that such preparation work be performed on all the spraying machines 30 at the same time. At this time, the amount of spray material received into each tank 44 is displayed on the continuous automatic control panel 48 by the load cell 46.

Next, the spray start button on the control panel 48 is turned on. As a result, one of the actuator-equipped ball valves 50 installed below the spraying machine 30 is first opened, and the air is supplied in a stabilized state from a compressor or the like of the air conveying means 38 via a known air receiver tank. The compressed air for blowing the blown material flows through the lower portion of the tank 44. At the same time, the ball valve with actuator 54 on one spraying machine side of the branch Y-shaped pipe 52 is opened, and the ball valve with actuator 56 on the other spraying machine side is closed. Next, the fixed quantity variable feeder 58 rotatably mounted in the one spraying machine 30 starts rotating, and conveys the sprayed material in the tank 44 to the blast furnace automatic spraying machine 34 by the compressed air through the material hose 36. The operation of each of these valves and the like is automatically driven by the operation of the solenoid valve by compressed air from an air compressor or the like that operates according to a procedure programmed by an automatic control program.

The material supplied through the material hose 36 and the well-known opening of the blast furnace 32 to the automatic spraying machine 34 in the blast furnace which is also supported by an electric hoist for raising and lowering a known blast furnace automatic spraying machine and a suspension chain. Is then kneaded with a predetermined amount of added water and injected through a nozzle to the eroded portion of the blast furnace to perform desired spray repair.

When the material supplied from one of the spraying machines 30 is exhausted, that is, when the value becomes zero in the load cell display, the one of the spraying machines 30 is instructed by a command from the control panel 48.
Are closed, the supply of compressed air stops, and the feeder 58 stops. After that, the valve 50 of another spraying machine 30 and the valve 56 of the Y-shaped pipe which are juxtaposed are opened, the compressed air for conveyance flows to the spraying machine, and the feeder of the spraying machine starts rotating. Material supply operation is continuously continued.

On the other hand, the material can be charged into the blown spraying machine 30 by the following procedure. That is, first, the exhaust valve 45 with the actuator is opened, and the spraying machine 30 is opened.
The remaining air in the tank 44 is discharged into the atmosphere. Next, the actuator-equipped butterfly valve 42 is released, and the material previously loaded in the hopper 28 is supplied into the tank 44.

When the supply of the material from another spraying machine 30 is completed, one of the spraying machines 3 by the same means.
Material supply from 0 starts continuously. In this way, a continuous supply of material is achieved.

When the repair in the blast furnace is completed, all operations are completed by pressing the automatic stop button of the continuous automatic control panel 48.

In the apparatus 20 according to the present invention, the spraying machine 30 communicates the inside thereof with the atmosphere by an exhaust valve 45 in order to easily fill the material from the hopper 28. The tank 4 which communicates with the pressure source
It is also possible to keep the inside of the chamber 4 under a negative pressure only when necessary. Further, when supplying the material from the tank 44, high-pressure air can be supplied from the valve 45 to adjust the feed of the material. Further, in the present invention, the diameter of the butterfly valve 42 with the actuator is made about 50% larger than the diameter of the conventional spraying machine so that the material in the hopper 28 can be put into the spraying machine main body 44 in a short time. The blade pitch of the material supply feeder 58 is set to about twice the pitch of the conventional spraying machine so that a large amount of the spraying material can be continuously discharged, and the diameter of the exhaust valve 45 is set to about 2 times that of the conventional spraying machine. After the spraying, the residual air inside the spraying machine body 44 can be quickly discharged into the atmosphere, and the inner surface material of the ball valves 50, 54, 56 with actuators is changed to a material having high wear resistance. Flexible container cutter 40 is installed in hopper 28 and flexible container bag 26 put into hopper 28 automatically. Quickly to enable Kaibukuro, to be able to perform continuous spray operations using multiple batch sprayer by automatic continuous control Puroburamu,
Thus, the spraying machine 30 according to the present invention can continuously spray a large amount of spraying material. Further, in the present invention, the diameter of the spraying machine main body 44 is increased by about 30% from the conventional spraying machine, while the height is reduced so that the spraying machine 30 can be transported by a truck or the like as required. By doing so, the capacity is ensured, and the hopper 28 is further removed so that the height is within the height limit of the highway, so that it can be easily moved at any time.

[0022]

The effects of the spray repair device of the present invention are as follows.

In the known apparatus, it was not possible to continuously spray a large amount of spray repair material, and much time was required for spray repair work. In the present invention, however, a plurality of spray machines 30 are used.
By using, the material can be continuously supplied, and the spray repair work can be shortened. When this is numerically displayed, the actual material discharge amount of the known device was from 5 tons per hour to a maximum of 10 tons. However, in the present device, 5 tons per hour to a maximum of 20
Variable discharge rate up to ton is possible.

The spray repair material is usually a powdery refractory material. So far, the hopper 3
When the spray repair material is supplied to the spraying machine 7, the primary added water is kneaded, but these are all performed under an open cycle, and the unkneaded material always generates dust. Was. However, in the present device, the hopper 2
Since the supply of the material from 8 to the spraying machine 30 is performed under a complete closed cycle, there is no fear of polluting the working environment.

Further, with the known apparatus, it is possible to prevent pollution and deterioration of the working environment due to scattering and leakage of powdery refractory material dust,
Since the primary addition water is kneaded to the material at the stage of supplying the material to the spraying machine 7 in order to increase the discharge amount, the material is solidified in the pre-dampener 6 or the spraying machine 7 or the spraying machine is used. 7
There has been an accident that the rotor and the like inside the cylinder are clogged and that the rubber seal and the like are easily worn away. Therefore, the work must be frequently interrupted to remove the solidified material that has adhered to the pre-dampener 6 and the spraying machine 7, to clean the clogging of the rotor and the like, and to replace the worn rubber seal. However, such disadvantages do not exist at all in the present invention since the primary additive water is not kneaded.

In the known apparatus, a large number of seal parts are used inside the apparatus to prevent generation of dust. In addition, the inside of the spraying machine 7 is particularly sealed to feed a gelled material kneaded with primary addition water. Although the number of consumable parts or wear parts has increased and the running cost has been extremely high, such a problem has been completely solved in the present device due to the operation under a closed cycle.

Furthermore, in the known device, the operator constantly observes the supply state of the primary additive water in the pre-dampener 6, and
It is necessary to judge the kneading state of the material and the added water. Further, the pressure or the amount of the kneaded material in the spraying machine 7 is always observed, and the optimum amount of the material is optimally determined from the nozzle of the blast furnace automatic spraying machine 10. It must be discharged in a state. Such work requires many years of skill. For this reason, spraying repair work so far was only possible with specific ones. However, in this device,
Since all operations can be performed by automatic control operation according to a preset program, no specific skill is required. For this reason, the operation using the present apparatus can be performed at a very low cost as compared with the known apparatus.

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram of the present invention.

FIG. 2 is a partially enlarged view of the present invention.

FIG. 3 is an overall explanatory view of a known device.

FIG. 4 is a view showing the inside of a spraying machine of a known device.

[Explanation of symbols]

20: Blast furnace spraying repair device 22: I beam 24: Hoist 26: Bag 28: Hopper 30: Spraying machine 32: Blast furnace 34: Automatic spraying machine 36: Hose 38: Air transfer means 40: Cutter 42: Valve 44: Spraying machine body 45: Exhaust valve 46: Load cell 48: Control panel 50: Valve 52: Y-shaped tube 54: Valve 56: Valve 58: Feeder

Claims (4)

(57) [Claims] A blast furnace spray repairing apparatus for spraying and repairing a sprayed material onto a shaft lining of a melted blast furnace, comprising a plurality of sprayed material input hoppers for receiving a powdered sprayed material.
A spraying machine 30 disposed below the hopper 28; and an automatic spraying machine 34 in the blast furnace 32 for spraying material from the spraying machine 30.
And a pneumatic conveying means 38 for supplying a powdery material from the hopper 28 through the hose 36. The sprayer 30 sprays the powder from the hopper 28. And a load cell 46 for displaying an amount of the material stored in the sprayer body 44. The sprayer body 44 is connected to the hopper 28. , An exhaust valve 45 for communicating the inside of the main body to the atmosphere, a valve 50 for controlling the flow of the spray material from the main body 44, and a material supply feeder 58. Conveying means 38 is connected to each spraying machine 30 from a high pressure source.
Next, the spraying machine 30 is connected to the automatic opening and closing valve connector 52 from the spraying machine 30 and thereafter communicates with the automatic spraying machine 34 in the blast furnace. Blast furnace spray repair equipment for quick repairs. 2. A valve 42, an exhaust valve 45, a valve 50,
The blast furnace spray repair apparatus according to claim 1, wherein the on-off valve of the connector 52 is automatically opened and closed by high-pressure air. 3. The blast furnace spray repairing apparatus according to claim 1, wherein two spraying machines 30 are provided, and the connector is a Y-shaped pipe. 4. The blast furnace spray repair according to claim 3, wherein the supply of the material from the other spray machine is automatically started when the material in the one spray machine runs out according to a signal from the load cell. apparatus.