JPH0520450Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention can be used, for example, when spraying and repairing containers for molten metal such as ladles and tundishes used in the iron and steel industry. Powder that can be used when blowing powder additives for desulfurization, dephosphorization, deoxidation, carburization, alloy addition, etc. into molten metal in a furnace or ladle using a carrier gas such as argon or nitrogen. The present invention relates to a granular material injection device.

Conventional technology and its problems Conventionally, this type of powder material injection device has a suitable powder material supply unit 9 as shown in FIG.
A material pressure-feeding pipe 93 is connected to the material discharge port 92 of the unit 1, an injection nozzle 94 is connected to the end of the pressure-feeding pipe, and a pressure-feeding gas is further supplied to the pressure-feeding pipe 93 near the material discharge port of the unit. As a result, one device can only handle one type of material.

Therefore, when repairing damaged parts of containers for molten metal such as ladles and tundishes in the steel manufacturing industry by spraying powdered refractories, the parts of the damaged parts that come into contact with slag and the parts that come into contact with molten steel, When spraying different materials suitable for the area,
Two of the above-mentioned granular material injection devices are prepared, and one is injected with high quality (high magnesia purity) seawater magnesia granule to repair the large amount of erosion in contact with the slag, and the other is injected with molten steel. Holds relatively low-cost natural magnesia powder for repairing contact areas,
The two units were used separately.

However, spraying sites are generally small, and two material pressure pipes and two spray nozzles are used there, making spraying repair work that much more difficult. Stop one of the devices you have been using,
The material pumping pipe and nozzle had to be switched to those of the other device to start the other device, which was a cumbersome and time-consuming switching operation, during which the spraying operation was interrupted.

Furthermore, the same problem as mentioned above occurs when two or more types of flux are injected into molten steel, and it is necessary to simultaneously mix and inject the fluxes held in each device in appropriate proportions. Even though it was possible, it was impossible.

The purpose of this invention is to provide a powder and granule material injection system with a compact structure that allows two or more types of powder and granule materials to be switched at any time without interrupting work, and to mix and use these two or more types of materials as needed. The goal is to provide equipment.

Means for Solving the Problems The object of the present invention is to provide (a) a pressure gas source for supplying pressurized gas, (b) a material pressure gas supply pipe connected to the pressure gas source, and (c) a powder supply pipe. It is equipped with a granular material holding section and an electric rotary feeder capable of adjusting the feeding amount of the granular material sent from the granular material holding section to the material discharge port, (d) a main pipe to which the material pressure-feeding pipe can be connected to the tip end and the material pressure-feeding gas supply pipe to the rear end; (e) a connector having a material receiving port that branches from the main pipe and is connected to each material discharge port of the powder material supply unit; and (e) a material whose rear end is connected to the tip of the main pipe of the connector. a pressure-feeding pipe; (f) connected to the tip of the material pressure-feeding pipe;
a material discharge nozzle held by a worker's hand;
(g) a remote control device having at least an operating section installed at a position close to the worker holding the material discharge nozzle, and capable of operating the pressure gas source and the rotary feeder of the powder supply unit; (h) Wiring connected from the remote control device to the control device for the powder supply unit and the pressure gas source.

According to this injection device, the granular material put into each of the two or more granular material supply units is supplied into the connector from the material discharge port of the unit, and is connected to the rear end of the connector. The material is sent through the material pressurizing pipe to the nozzle by the pressurizing gas flowing from the material pressurizing gas supply pipe, and is injected from the nozzle.

The material discharge supply from each unit to the connecting device or its stop can be executed at any time using the control section of the remote control device located within the reach of the operator holding the nozzle (e.g. above the nozzle). Therefore, the materials can be switched or mixed at any time.

Preferably, the material discharge port of the powder supply unit is provided with an electric on-off valve that opens and closes by operating the remote control device.

Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 4.

One embodiment of the apparatus shown in FIGS. 1 to 3 is an apparatus suitable for spray repair of a container for molten metal, and includes a compressed air source 70, two granular material supply units 1 and 2,
It is equipped with a connector 3, a material pumping pipe 4, a material discharge nozzle 5, a compressed air source 70, and a remote control device 6 capable of operating the units 1 and 2. The unit 1 is equipped with a material holding hopper 12 having a granular material input port 11 at the upper part, an electric rotary feeder 13 provided below the hopper, and a discharge port 14 for discharging the material sent from the feeder. .

The electric rotary feeder has a cone-shaped member 133 erected on a circular table 132 that is rotationally driven by a motor 131 in the direction of arrow A in FIG. A guide member 135 is provided in an opening 134 provided at the side of the lower part of the hopper 12 to guide the material from the opening to the outside of the hopper. It is carried to the opening 134 at the lower end of the hopper, where it is guided by a guide 135 and falls into the discharge port 14.

The unit 2 has the same structure as the unit 1, and includes a hopper 22 having a material input port 21, an electric rotary feeder 23, and a discharge port 24.

As can be seen from FIGS. 1 and 3, the connector 3 is
A main pipe 31 and a material receiving port 3 branched from the main pipe and connected to the material discharge ports 14 and 24 of the unit.
It is equipped with 2,33. The main pipe includes a short pipe part 311 with a branched mouth part 32, a short pipe part 312 with a branched mouth part 33, a pipe part 313 between the two short pipe parts, and threaded joints 314, 314 between these pipe parts. It is made up of A flexible material pressure-feeding pipe 4 is connected to the tip of the main pipe 31, and a nozzle 5 is connected to the tip of the pipe 4.

The rear end of the main pipe 31 is connected via a valve 71 to an air supply pipe 7 extending from a compressed air source 70 and for pressurizing the material.

The remote control device 6 includes an operating section 61 attached to the base of the nozzle 5 and an electric wire 62 connecting the operating section to the motor operation control sections 15 and 25 of the units 1 and 2 and the operation control section 72 of the compressed air source 70. The motors 131 and 231 of the electric rotary feeders of the units 1 and 2 can be turned on and off from the operation part 61 at the base of the nozzle 5 held by the operator.
The compressed air source 70 can be turned on/off.

If necessary, the valve 71 may be a solenoid valve, which can also be operated from the operating section 61.

According to this embodiment of the apparatus, for example, in order to repair a molten steel tundish by spraying, put seawater magnesia powder into unit 1 and natural magnesia powder into unit 2. and the nozzle 5, operate the operation part 61 to operate the compressed air source 70, and operate either the unit 1 or 2, for example, the electric rotary feeder 13 of the unit 1, to feed the seawater magnesia powder and granules. is injected from the nozzle 5 to repair the slag contact area of the tundish. When the repair is completed, immediately operate the operation part 61 to turn on the unit 1.
The electric rotary feeder 13 of the unit 2 is stopped, and the electric rotary feeder 23 of the unit 2 is activated to spray natural magnesia powder from the nozzle 5, thereby spraying and repairing the molten steel contact area of the tundish. .

When the repair is completed, the operation section 61 operates the electric rotary feeder 23 and compressed air source 70 of the unit 2.
All you have to do is stop it.

In this way, switching between seawater magnesia and natural magnesia can be easily performed without interrupting the spraying operation.

Compared to the case where a tundish is repaired using a conventional device, the device is easier to handle, so the repair is easier, and the repair time is shortened. In addition, compared to the case where two conventional devices cannot be used due to space issues in the work area and the entire tundish has to be repaired using only high-quality seawater magnesia, even when the work space is small, Since it is possible to use the device shown in FIG. 1, repair costs are significantly reduced.

In the embodiment shown in FIG. 4, the molten steel in the melting furnace 8 is
This is a powder material injection device used as a flux injection device that injects CaO and Si-Mn or only CaO. This device is similar to that of FIG.
It is equipped with a unit 1 containing Si-Mn, a unit 2 containing CaO, a connector 3, a material pressure pipe 4, a nozzle (blow lance) 5', and a remote control device 6'. In the apparatus shown in FIG. 4, parts with the same reference numerals as those in the apparatus of FIG. 1 are the same as those in FIG.

The rear end of the fitting 3 is connected by a pipe 7' to a carrier gas source 70' via a valve 71'.

Discharge ports 14, 24 of units 1, 2 and connector 3
Butterfly valves 16 and 26 are provided between the material receiving ports 32 and 33 to open and close the discharge port, and the valves 16 and 26 are driven by air cylinders 17 and 27 whose compressed air supply is controlled by a solenoid valve. be done. The remote control device 6' includes an operating section 61' provided at the base of the blowing lance 5' and an electric wire 62' extending from the operating section 61'.
A control unit 1 that controls the motor operation of the electric rotary feeder No. 2 and controls the opening and closing of the butterfly valve.
5', 25' and a carrier gas source operation control section (for example, an on/off control section for a solenoid valve) 72', an operating section 61' is connected to the operating section 61'. On-off and rotation speed adjustment of feeder motor (servo motor) 131, 231, butterfly valve 16, 26
and the carrier gas source.

According to the device shown in FIG. 4, for example, the operating section 6
1' to start the carrier gas supply, and on the other hand,
Open both the butterfly valves 16 and 26 of units 1 and 2, start the motors 131 and 231, and adjust their rotational speeds to connect the Si-
Mn and CaO are supplied at a predetermined ratio (e.g. Si-Mn70%,
CaO (30%) is mixed and injected into the molten steel from the injection lance 5' at the same time.Then, the motor 131 of unit 1 is stopped and the valve 16 is closed to inject only CaO. , 2 valves 16, 26 are opened, and the rotational speed of the motors 131, 231 is adjusted.
Possible to inject 10% Si-Mn and 90% CaO.

Si-Mn70%, CaO 30% and Si-Mn10%, CaO
It is very advantageous that 90% proportional control discharge can be easily achieved by changing the rotational speed of the motors 131, 231.

The amount of injection can be controlled by timer control or by attaching load cell devices to units 1 and 2.
This can be easily done by knowing the amount of reduction or remaining amount of material in the units 1 and 2.

Effects of the invention The powder and granule material injection device according to the present invention has a powder and granule material holding section and two or more powder and granule material supply units each equipped with an electric rotary feeder, which are connected to a powder and granule material feeding path. These powder and granule material supply units are arranged along a main pipe provided as a part of the feeding route and branched from the main pipe and connected to each material discharge port of the powder and granule material supply unit. are arranged in series with each other by a connector having a material receiving opening. Further, the base of the material discharge nozzle of the injection device is equipped with a remote control device capable of controlling the pressure gas source and the electric rotary feeder of the powder supply unit.

For this reason, in the above-mentioned injection device, the operator can switch between the powder and granular material for spraying at any time without interrupting the work and use the remote control device at hand without interrupting the work. The granules can be mixed and used as appropriate. Furthermore, since the remote control device can control the operation of the pressure gas source and change the motor rotation speed of the electric rotary feeder of the powder supply unit, the feed rate of the powder and granule material can be adjusted with high precision. Mixing at a predetermined ratio is also easy. Moreover, the feeding path of the powder or granular material may be purified by stopping the supply of the powder or granular material and blowing pressurized gas from the pressurized gas source using the remote control device.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, and FIG. 1 is a schematic explanatory diagram showing the whole diagrammatically;
2 is a sectional view taken along the line X-X of FIG. 1, FIG. 3 is a sectional view of the connector, FIG. It is a schematic explanatory drawing of an example. 1, 2... Powder material supply unit, 13, 2
3...Electric rotary feeder, 14, 24...
Material discharge port, 16, 26...butterfly valve,
3... Connector, 31... Main pipe, 32, 33... Material receiving port, 4... Material pressure feeding pipe, 5, 5'
...Nozzle, 6,6'...Remote control device, 61,
61'... Operating unit, 70, 70'... Pressure gas source.

Claims (1)

[Claims for Utility Model Registration] (a) A pressure gas source that supplies pressurized gas; (b) A material pressurized gas supply pipe connected to the pressure gas source; (c) A granular material holding section; and an electric rotary feeder that can adjust the feed rate of the powdered material sent from the powdered material holding section to the material discharge port, and arranged in series along the feeding path of the powdered material. (d) a main pipe to which a material pressure-feeding pipe can be connected to the tip end and the material-pressure gas supply pipe to the rear end, and a main pipe branched from the main pipe to connect the (e) a material pressure-feeding pipe whose rear end is connected to the main pipe tip of the connector; (f) connected to the tip of the material pumping pipe,
(g) at least an operating section is installed at the base of the material discharging nozzle, and the pressurized gas source and the rotary feeder of the powder supply unit are connected to each other; Powder material injection characterized by comprising: a remote control device that can be operated; and (h) wiring connected from the remote control device to a control device for the powder supply unit and the pressurized gas source. Device. Powder according to claim 1, characterized in that the material discharge port of the powder material supply unit is provided with an electric on-off valve that can be opened and closed by operating the remote control device. Body material injection device.