Claims
- 1. A refractory flame-gunning apparatus which comprises:
- a feeder comprising a refractory powder feeding section, an inflammable gas feeding section, a combustion-assisting gas feeding section, and an inert gas feeding section;
- a controller for controlling the supply of refractory powder and the supply of inflammable gas, combustion-assisting gas and inert gas, said controller having an inflammable gas pipe means extending from said inflammable gas feeding section, a combustion-assisting gas pipe means extending from said combustion-assisting gas feeding section, a first inert gas pipe means extending from said inert gas feeding section and connected to said inflammable gas pipe means, a second inert gas pipe means extending from said inert gas feeding section and connected to said combustion-assisting gas pipe means, an inflammable gas valve in said inflammable gas pipe means between the point where said inflammable gas and first inert gas pipe means meet and said inflammable gas feeding section,
- a combustion-assisting gas valve in said combustion-assisting gas pipe means between the point where said combustion-assisting gas and second inert gas pipe means meet and said combustion-assisting gas feeding section, a first inert gas valve in said first inert gas pipe means, a second inert gas valve in said second inert gas pipe means; and a control unit including a temperature sensor for detecting a temperature due to backfiring, the control unit including means for outputting opening and closing signals to said inflammable gas valve, said combustion-assisting gas valve and said first and second inert gas valves on the basis of signals emitted by said temperature sensor; and
- a flame-gunning burner having a plurality of refractory powder and flame ejecting nozzles disposed at the tip thereof, a gas mixer having an inflammable gas passage to which said inflammable pipe means is connected, a combustion-assisting gas passage to which said combustion-assisting gas pipe means is connected, said burner having a gas mixing chamber therein to which said inflammable and combustion-assisting gas passages are connected, and a mixed gas passage extending out of said gas mixing chamber to said flame ejecting nozzles, and a combustion-assisting gas cutoff valve in said combustion-assisting gas passage normally urged toward the closed position and held out of said closed position and having means exposed to said mixed gas passage for releasing the holding of said cutoff valve to quickly close said combustion-assisting gas passage in response to a build-up of pressure in said mixed gas passage due to backfiring, said temperature sensor being positioned in said mixed gas passage, and said outputting means in said control unit outputting signals for closing said combustion-assisting gas valve and opening said second inert gas valve when a temperature indicating backfiring is sensed, and for subsequently closing said inflammable gas valve and opening said first inert gas valve.
- 2. An apparatus as claimed in claim 1 in which the gas mixer comprises a housing having said inflammable gas and combustion-assisting gas passages therein, a mixing pipe mounted in said housing within which said mixed gas passage is located, a cylinder extending out of said mixing pipe, and a piston means axially slidably fitted in said cylinder and operatively connected to said cutoff valve to close said cutoff valve when said piston means moves rearwardly in response to build-up of pressure in said mixing pipe.
- 3. An apparatus as claimed in claim 2 in which said combustion-assisting gas passage has a combustion-assisting gas chamber therein, and further comprising an actuating rod slidable in said chamber and to which said piston means is connected, and means defining a connecting passage means for the combustion-assisting gas in said combustion-assisting gas chamber, said cutoff valve having a valve member movable to open and close said connecting passage means in response to movement of said actuating rod.
- 4. An apparatus as claimed in claim 2 in which said gas mixer further has an inflammable gas filter chamber in said inflammable gas passage with a gas filter therein, and a combustion-assisting gas filter chamber mounted on said actuating rod within said combustion-assisting gas chamber and having a gas filter therein and having openings on opposite sides of said gas filter for directing combustion-assisting gas through said combustion-assisting gas filter chamber.
- 5. An apparatus as claimed in claim 2 in which said cutoff valve comprises a valve seat in said combustion-assisting gas chamber and having apertures therein, a cylindrical guide projecting away from said mixing pipe into said combustion-assisting gas chamber, a sleeve slidably fitted on said guide for movement toward and away from said valve seat and having a valve body thereon for closing said apertures when said valve body is against said valve seat, said piston having an actuating rod thereon extending into said guide, a first spring between the rear end of said cylindrical guide and said actuating rod for urging said actuating rod forward toward said mixing pipe, a further spring connected between the rear end of said cylindrical guide and said sleeve for urging said sleeve toward said valve seat, and locking means normally blocking movement of said sleeve toward said valve seat and engageable by said actuating rod during rearward movement thereof to release said sleeve.
Priority Claims (1)
Number |
Date |
Country |
Kind |
58-220411 |
Nov 1983 |
JPX |
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Parent Case Info
This application is a continuation of now abandoned application Ser. No. 673,173, filed Nov. 19, 1984.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
1068194 |
Nov 1959 |
DEX |
2066355 |
Oct 1970 |
FRX |
2471552 |
Dec 1979 |
FRX |
56-31332 |
Jul 1981 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
673173 |
Nov 1984 |
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