Title of Invention	A METHOD FOR PREPARING CLEANED REFRACTORY NOZZLES FROM TAR-IMPREGNATED REFRACTORY NOZZLES AND A DEVICE THEREFOR
Abstract	There is proposed a method of preparing cleaned refractory nozzles from tar impregnated refractory nozzles which comprises in accommodating the tar refractory nozzle to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory product. There is also proposed a suitable device therefor.

Title of Invention

A METHOD FOR PREPARING CLEANED REFRACTORY NOZZLES FROM TAR-IMPREGNATED REFRACTORY NOZZLES AND A DEVICE THEREFOR

Abstract

There is proposed a method of preparing cleaned refractory nozzles from tar impregnated refractory nozzles which comprises in accommodating the tar refractory nozzle to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory product. There is also proposed a suitable device therefor.

Full Text	INTRODUCTION TO THE FILED OF THE INVENTION. This invention relates (o a method for preparing cleaned refractory nozzles from tar impregnated refractory nozzles This invention also relates to an equipment for cleaning tar impregnated refractory nozzles PRIOR ART, Tar impregnation is one of the important process in the manufacture of continuous casting (CC) in deciding its final properties and quality of refractories. Normally, in tar impregnated nozzles the tar is deposited inside the bore area, which is cleaned manually by hand chipping method. DRAWBACK OF PRIOR ART: The hand chipping method has several drawbacks of which mention may be made of the following: 1. It is slow and tiresome. 2. It is labour intensive. 3. It is monotonous. 4. It is environmentally hazardous 5. It increases the labour cost 6 Rate of production is affected. 7. The product quality is not upto the Mark. 8 The product quality is not always uniform. OBJECTS OF THE INVENTION: It is therefore an object of this invention to propose an improved method for preparing cleaned refractory nozzles from tar impregnated refractory nozzles It is another object to propose such a method, which will reduce labour cost, be fast, accurate and environment friendly. It is further object to propose such a process, which will ensure uniform quality product 2 Yet another object of the invention is to propose an equipment for cleaning tar impregnated refractory nozzles and achieve advantages such an speed, accuracy, environmentally friendliness, easy to install and operate. It is still further object of this invention to propose such an equipment, which can be used for cleaning various types of refractory nozzles. These and other objects will be apparent from the following description. STATEMENT OF THE INVENTION: According to this invention there is provided, a method for preparing cleaned refractory nozzles from tar impregnated refractory nozzles which comprises in accommodating the tar impregnated refractory nozzles to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory nozzle. A plurality of refractory nozzles are arranged inside the enclosure, such that the target area is clearly exposed to the steel shots The compressed air is injected into the enclosure and on the target area of the refractories while steel shots are admitted into the stream of compressed air ahead of its admission into the enclosure The pressure of air admitted into the enclosure holding refractory nozzles to be cleaned is of the order of 5 Kg/Cm though the pressure of air can vary depending upon requirements. The stream coming out of the enclosure carrying steel shots and fine particles of removed tar as dust, is subjected to a dust removal operation to remove the dust from the steel shots and a steel shots collection operation. The steel shots are held in a tank into which compressed air, at a pressure lesser than the air pressure in the injector nozzles, is admitted to encourage flow of the shots out of the tank and into main air stream There is also provided according to this invention, a device for preparing cleaned refractory nozzles from tar impregnated refractory nozzles comprising a tank for holding steel shots, an enclosure for holding the refractory products in a manner such that the target areas are exposed to a stream of compressed air laden with steel shots, a compressed air source for feeding compressed air to an air 3 injector nozzle connected to said refractory products holding enclosure and to the steel shot holding tank, said air injector nozzle having been also connected to the steel shots holding tank in a suitable manner, suitable pressure regulating valves in association (I) with the compressed air supply injector to the said enclosure and (ii) with the supply pipe to the said shots holding tank such that the air admitted into the air injector nozzle is at a higher pressure than the air admitted into the said tank, the leading end of the said enclosure being connected to a shot and tar dust collection unit there being provided means for removing dust and steel shots separately. The refractory nozzles to be cleaned is preferably refractory nozzle having tar deposited in the bore. A plurality of the refractory nozzles are arranged with the nozzle tip of all the nozzles facing one direction and each tip abutting against the base of the bore of the immediately next nozzle in the air flow direction such that there is continuity of bore passage. The base of the trailing or last nozzle of the plurality of nozzle is in contact with the air passage of the air injector nozzle unit and is in the axial direction of the compressed air. At a suitable place in the air injector nozzle, after the pressure regulator there is connected a steel shot, supply valve attached to the lower end of a shot holding tank. The area where the steel shots will enter into the air injector nozzle, is provided with an enlarged sections. The top of the steel shot holding tank is provided with a shot charging mouth and a compressed air inlet The said inlet is connected by suitable pipe means through a pressure indicator and a pressure regulator to the compressed air supply source. The nozzles are arranged in the horizontal manner in a line inside the enclosure, which is provided with necessary door The said door is preferably operated by a pneumatic cylinder is connected to a collecting unit having a downward inclined surface. 4 BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING. The invention will now be more fully described with reference to the accompanying drawings of the provisional specification in which, Fig. 1 shows a tar impregnated refractory nozzle and Fig. 2 shows schematically the equipment of the invention used for jthe cleaning of refractory nozzles for example DETAILED DESCRIPTION OF THE DRAWINGS. For the sake of a clear understanding the invention will be described with reference to a refractory nozzle and is not limited thereto It is well known that collector and ladle nozzles are used in ladle refractories of steel melting shops The method comprises in accommodating the refractory nozzles to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory nozzles. In this method, a plurality of refractory nozzles are arranged inside the enclosure such that the target area is clearly exposed to the steel shots The compressed air is injected into the enclosure and on the target area of the refractory nozzles while steel shots are admitted into the stream of compressed air ahead of its admission into the enclosure. The air pressure can be of the order of 5 Kg/Cnf, though the pressure of air can vary depending upon requirements. The stream coming out of the enclosure carrying steel shots and fine particles of removed tar as dust, is subjected/a dust removal operation to remove the dust from the steel shots and a stee! shots collection operation. Referring to Fig. 1 , it represents a tar impregnated refractory nozzle ( collector nozzle ) in which tar is deposited inside the bore. The usual practice is to manually clean each nozzle which often damages the nozzle bore and the removed tar is exposed to outside 5 As can be seen from Fig 2, the device according to this invention comprises an enclosure (2} to accommodate the refractory nozzle to be cleaned. In this Figure, a plurality of such nozzles (3) are arranged with the nozzle tip of all the nozzles facing one direction and each tip abutting against the base of the bore of the immediately next nozzle in the air flow direction such that there is continuity of bore passage. The base of the trailing or last nozzle (3a) of the plurality of nozzle is in contact with the air passage (4) of the air injector nozzle unit (5) and is in the axial direction of the compressed air The compressed air injecting nozzle unit (5) is provided with necessary valve arrangement (6) for controlling admission of air, and a pressure indicator (7). At a suitable place in the air injector nozzle, after the pressure regulator, there is connected a steel shot, supply valve (8) attached to the lower end of a shot holding tank (9). To ensure smooth flow and to avoid blockage, the area where the steel shots will enter into the air injector nozzle, is provided with an enlarged section (10), The top of the steel shot holding tank is provided with a shot charging mouth (11) and a compressed air inlet (12). This inlet is connected by suitable pipe means (13) through a pressure indicator (14) and a pressure regulator (15) to the compressed air supply source. The nozzles are arranged in the honzonta! manner in a line inside the enclosure, which is provided with necessary door (16), The door is preferably operated by a pneumatic cylinder (17) for safety reasons. The door is opened after stopping supply of compressed air. The fore end of the refractory product holding enclosure is connected to a collecting unit (18) having a downward inclined surface. The steef shots discharged from the end of the enclosure collects at the bottom, which has a valve (19), There is provided a dust collection unit (20), which receive the dust, filters it from the exhausted air, The lower end of the collection unit (18) is connected to a slot collector (21) through the said valve (19). The exhausted dust free ak is suitably vented. The pressure of the air stream admitted to the slot tank is substantially lower than the pressure of air stream admitted to the air injector nozzle for obvious reasons. The compressed air at lesser pressure gives a forward push to the steel shots in the shot tank and forces them out. The higher pressure air sucks these shots as these come into its path and impinges on to the target area, in this case not the refractory nozzle bore. 6 The shots moving at high speed automatically dislodge deposited tar from the bore area and the air carries these dislodged tar as dust. EXPERIMENTAL VERIFICATION: A comparative analysis of hand chipping (manual) and the newly developed machine is given below: - COMPARATIVE DATA Process of cleaning Item No. of Time Remarks pieces taken cleaned Newly invented LS - 70 Collector 160 8hrs. Product quality is highly machine Nozzle (85% AI203 tar sophisticated. impregnated nozzles). Environmentally friendly. High productive. Dimensional stability maintained. Manual (hand -do- 40 8hrs. Ore damaged observed. chipping) Environmentally hazardous. Dimensional stability could not be maintained. Low productive. While the drawing has shown refractory nozzles to be cleaned, it is possible by the same method and equipment to clean other refractory products also. 7 We Claim: 1 A method of preparing cleaned refractory nozzles from tar impregnated refractory nozzles which comprises in accommodating the tar refractory nozzle to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory product. 2 A method as claimed in Claim 1, wherein a plurality of refractory nozzles are arranged inside the enclosure, such that the target area is clearly exposed to the steel shots. 3 A method as claimed in Claim 1 or 2, wherein compressed air is injected into the enclosure and on the target area of the refractories while steel shots are admitted into the stream of compressed air ahead of its admission into the enclosure. 4. A method as claimed in Claim 3, wherein the pressure of air admitted into the enclosure holding refractory nozzle to be cleaned is of the order of 5'Kfci/Civi1" though the pressure of air can vary depending upon requirements. 5 A method as claimed in Claim 4 , wherein the stream coming out of the enclosure carrying steel shots and fine particles of removed tar as dust, is subjected^fa dust removal operation to remove the dust from the steel shots and a steel shots and a steel shots collection operation. 6. A method as claimed in claims 4 and 5, wherein the steel shots are held in a tank into which compressed air, at a pressure lesser than the air pressure in the injector nozzles, is admitted to encourage flow of the shots out of the tank and into main air stream 7 A device for preparing cleaned refractory nozzles from tar impregnated refractory nozzles by the method as claimed in Claims 1 to 6, comprising a tank for holding steel shots, an enclosure for 8 holding the refractory nozzles in a manner such that the target areas are exposed to a stream of compressed air laden with steel shots, a compressed air source for feeding compressed air to n air injector nozzle connected to said refractory nozzle holding enclosure and to the steel shot holding tank, said air injector nozzle having been also connected to the steel shots holding tank in a suitable manner, suitable pressure regulating valves in association (i) with the compressed air supply injector to the said enclosure and (ii) with the supply pipe to the said shot holding tank such that tne air admitted into the air injector nozzle is at a higher pressure than the air admitted into the said tank, the leading end of the said enclosure being connected to a shot and tar dust collection unit there being provided means for removing dust and steel shots separately. 8. A device as claimed in Claim 7, wherein the refractory nozzle to be cleaned is preferably refractory nozzle having tar deposited in the bore 9. A device as claimed in Claim 7, wherein the refractory nozzles are arranged with the nozzle tip of all the nozzles facing one direction and each tip abutting against the base of the bore of the immediately next nozzle in the air flow direction such that there is continuity of bore passage. 10 A device as claimed in Claim 7 wherein the base of the trailing or last nozzle of the. nozzle is in contact with the air passage of the air injector nozzle unit and is in the axial direction of the compressed air. 11. A device as claimed in Claim 10 wherein at a suitable place in the air injector nozzle, after the pressure regulator there is connected a steel shot valve attached to the lower end of a shot holding tank. 12. A device as claimed in Claim 7 wherein the area where the steel shots will enter into the air injector nozzle, is provided with an enlarged sections. 9 -10- 13. A device as claimed in claim 12 wherein the top of the steel shot holding tank is provided with a shot charging mouth and a compressed lair inlet 14. A device as claimed in claim 13 wherein air inlet is connected by suitable pipe means through a pressure indicator and a pressure regulator to the compressed air supply source. 15. A method of preparing cleaned refractory nozzles from tar impregnated refractory nozzles substantially as herein described 16. A device for preparing cleaned refractory nozzles from tar impregnated refractory nozzles substantially as herein described with reference to the drawings accompanying the provisional specification. There is proposed a method of preparing cleaned refractory nozzles from tar impregnated refractory nozzles which comprises in accommodating the tar refractory nozzle to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory product. There is also proposed a suitable device therefor.

Full Text

INTRODUCTION TO THE FILED OF THE INVENTION.
This invention relates (o a method for preparing cleaned refractory nozzles from tar impregnated refractory nozzles
This invention also relates to an equipment for cleaning tar impregnated refractory nozzles PRIOR ART,
Tar impregnation is one of the important process in the manufacture of continuous casting (CC) in deciding its final properties and quality of refractories. Normally, in tar impregnated nozzles the tar is deposited inside the bore area, which is cleaned manually by hand chipping method.
DRAWBACK OF PRIOR ART:
The hand chipping method has several drawbacks of which mention may be made of the following:
1. It is slow and tiresome.
2. It is labour intensive.
3. It is monotonous.
4. It is environmentally hazardous
5. It increases the labour cost
6 Rate of production is affected.
7. The product quality is not upto the Mark.
8 The product quality is not always uniform.
OBJECTS OF THE INVENTION:
It is therefore an object of this invention to propose an improved method for preparing cleaned refractory nozzles from tar impregnated refractory nozzles
It is another object to propose such a method, which will reduce labour cost, be fast, accurate and environment friendly.
It is further object to propose such a process, which will ensure uniform quality product
2

Yet another object of the invention is to propose an equipment for cleaning tar impregnated refractory nozzles and achieve advantages such an speed, accuracy, environmentally friendliness, easy to install and operate.
It is still further object of this invention to propose such an equipment, which can be used for cleaning various types of refractory nozzles.
These and other objects will be apparent from the following description. STATEMENT OF THE INVENTION:
According to this invention there is provided, a method for preparing cleaned refractory nozzles from tar impregnated refractory nozzles which comprises in accommodating the tar impregnated refractory nozzles to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory nozzle.
A plurality of refractory nozzles are arranged inside the enclosure, such that the target area is clearly exposed to the steel shots
The compressed air is injected into the enclosure and on the target area of the refractories while steel shots are admitted into the stream of compressed air ahead of its admission into the enclosure
The pressure of air admitted into the enclosure holding refractory nozzles to be cleaned is of the order of 5 Kg/Cm though the pressure of air can vary depending upon requirements.
The stream coming out of the enclosure carrying steel shots and fine particles of removed tar as dust, is subjected to a dust removal operation to remove the dust from the steel shots and a steel shots collection operation.
The steel shots are held in a tank into which compressed air, at a pressure lesser than the air pressure in the injector nozzles, is admitted to encourage flow of the shots out of the tank and into main air stream
There is also provided according to this invention, a device for preparing cleaned refractory nozzles from tar impregnated refractory nozzles comprising a tank for holding steel shots, an enclosure for holding the refractory products in a manner such that the target areas are exposed to a stream of compressed air laden with steel shots, a compressed air source for feeding compressed air to an air
3

injector nozzle connected to said refractory products holding enclosure and to the steel shot holding tank, said air injector nozzle having been also connected to the steel shots holding tank in a suitable manner, suitable pressure regulating valves in association (I) with the compressed air supply injector to the said enclosure and (ii) with the supply pipe to the said shots holding tank such that the air admitted into the air injector nozzle is at a higher pressure than the air admitted into the said tank, the leading end of the said enclosure being connected to a shot and tar dust collection unit there being provided means for removing dust and steel shots separately.
The refractory nozzles to be cleaned is preferably refractory nozzle having tar deposited in the bore.
A plurality of the refractory nozzles are arranged with the nozzle tip of all the nozzles facing one direction and each tip abutting against the base of the bore of the immediately next nozzle in the air flow direction such that there is continuity of bore passage.
The base of the trailing or last nozzle of the plurality of nozzle is in contact with the air passage of the air injector nozzle unit and is in the axial direction of the compressed air.
At a suitable place in the air injector nozzle, after the pressure regulator there is connected a steel shot, supply valve attached to the lower end of a shot holding tank.
The area where the steel shots will enter into the air injector nozzle, is provided with an enlarged sections.
The top of the steel shot holding tank is provided with a shot charging mouth and a compressed air inlet
The said inlet is connected by suitable pipe means through a pressure indicator and a pressure regulator to the compressed air supply source.
The nozzles are arranged in the horizontal manner in a line inside the enclosure, which is provided with necessary door
The said door is preferably operated by a pneumatic cylinder is connected to a collecting unit having a downward inclined surface.
4

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING.
The invention will now be more fully described with reference to the accompanying drawings of the
provisional specification in which,
Fig. 1 shows a tar impregnated refractory nozzle and
Fig. 2 shows schematically the equipment of the invention used for jthe cleaning of refractory nozzles
for example
DETAILED DESCRIPTION OF THE DRAWINGS.
For the sake of a clear understanding the invention will be described with reference to a refractory nozzle and is not limited thereto
It is well known that collector and ladle nozzles are used in ladle refractories of steel melting shops
The method comprises in accommodating the refractory nozzles to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory nozzles.
In this method, a plurality of refractory nozzles are arranged inside the enclosure such that the target area is clearly exposed to the steel shots
The compressed air is injected into the enclosure and on the target area of the refractory nozzles while steel shots are admitted into the stream of compressed air ahead of its admission into the enclosure.
The air pressure can be of the order of 5 Kg/Cnf, though the pressure of air can vary depending upon requirements.
The stream coming out of the enclosure carrying steel shots and fine particles of removed tar as dust, is subjected/a dust removal operation to remove the dust from the steel shots and a stee! shots collection operation.
Referring to Fig. 1 , it represents a tar impregnated refractory nozzle ( collector nozzle ) in which tar is deposited inside the bore. The usual practice is to manually clean each nozzle which often damages the nozzle bore and the removed tar is exposed to outside
5

As can be seen from Fig 2, the device according to this invention comprises an enclosure (2} to accommodate the refractory nozzle to be cleaned. In this Figure, a plurality of such nozzles (3) are arranged with the nozzle tip of all the nozzles facing one direction and each tip abutting against the base of the bore of the immediately next nozzle in the air flow direction such that there is continuity of bore passage. The base of the trailing or last nozzle (3a) of the plurality of nozzle is in contact with the air passage (4) of the air injector nozzle unit (5) and is in the axial direction of the compressed air
The compressed air injecting nozzle unit (5) is provided with necessary valve arrangement (6) for controlling admission of air, and a pressure indicator (7).
At a suitable place in the air injector nozzle, after the pressure regulator, there is connected a steel shot, supply valve (8) attached to the lower end of a shot holding tank (9). To ensure smooth flow and to avoid blockage, the area where the steel shots will enter into the air injector nozzle, is provided with an enlarged section (10),
The top of the steel shot holding tank is provided with a shot charging mouth (11) and a compressed air inlet (12). This inlet is connected by suitable pipe means (13) through a pressure indicator (14) and a pressure regulator (15) to the compressed air supply source.
The nozzles are arranged in the honzonta! manner in a line inside the enclosure, which is provided with necessary door (16), The door is preferably operated by a pneumatic cylinder (17) for safety reasons. The door is opened after stopping supply of compressed air.
The fore end of the refractory product holding enclosure is connected to a collecting unit (18) having a downward inclined surface. The steef shots discharged from the end of the enclosure collects at the bottom, which has a valve (19), There is provided a dust collection unit (20), which receive the dust, filters it from the exhausted air,
The lower end of the collection unit (18) is connected to a slot collector (21) through the said valve (19).
The exhausted dust free ak is suitably vented.
The pressure of the air stream admitted to the slot tank is substantially lower than the pressure of air stream admitted to the air injector nozzle for obvious reasons.
The compressed air at lesser pressure gives a forward push to the steel shots in the shot tank and forces them out. The higher pressure air sucks these shots as these come into its path and impinges on to the target area, in this case not the refractory nozzle bore.
6

The shots moving at high speed automatically dislodge deposited tar from the bore area and the air carries these dislodged tar as dust.
EXPERIMENTAL VERIFICATION:
A comparative analysis of hand chipping (manual) and the newly developed machine is given below: -
COMPARATIVE DATA

Process of cleaning
Item
No. of
Time
Remarks

pieces
taken

cleaned

Newly invented
LS - 70 Collector
160
8hrs.
Product quality is highly
machine
Nozzle (85% AI203 tar

sophisticated.

impregnated nozzles).

Environmentally friendly.

High productive.

Dimensional stability maintained.
Manual (hand
-do-
40
8hrs.
Ore damaged observed.
chipping)

Environmentally hazardous.

Dimensional stability could not

be maintained.

Low productive.
While the drawing has shown refractory nozzles to be cleaned, it is possible by the same method and equipment to clean other refractory products also.
7

We Claim:
1 A method of preparing cleaned refractory nozzles from tar impregnated refractory nozzles which
comprises in accommodating the tar refractory nozzle to be cleaned in an enclosure and
impinging or spraying on the target area a steady stream of metal shots, preferably steel shots
using high pressure air, separating the metal shots and the dust, the operation being carried out
until the desired result has been obtained followed by recovering the cleaned refractory product.
2 A method as claimed in Claim 1, wherein a plurality of refractory nozzles are arranged inside
the enclosure, such that the target area is clearly exposed to the steel shots.
3 A method as claimed in Claim 1 or 2, wherein compressed air is injected into the enclosure and
on the target area of the refractories while steel shots are admitted into the stream of compressed
air ahead of its admission into the enclosure.
4. A method as claimed in Claim 3, wherein the pressure of air admitted into the enclosure holding refractory nozzle to be cleaned is of the order of 5'Kfci/Civi1" though the pressure of air can vary depending upon requirements.
5 A method as claimed in Claim 4 , wherein the stream coming out of the enclosure carrying steel shots and fine particles of removed tar as dust, is subjected^fa dust removal operation to remove the dust from the steel shots and a steel shots and a steel shots collection operation.
6. A method as claimed in claims 4 and 5, wherein the steel shots are held in a tank into which compressed air, at a pressure lesser than the air pressure in the injector nozzles, is admitted to encourage flow of the shots out of the tank and into main air stream
7 A device for preparing cleaned refractory nozzles from tar impregnated refractory nozzles by the method as claimed in Claims 1 to 6, comprising a tank for holding steel shots, an enclosure for
8

holding the refractory nozzles in a manner such that the target areas are exposed to a stream of compressed air laden with steel shots, a compressed air source for feeding compressed air to n air injector nozzle connected to said refractory nozzle holding enclosure and to the steel shot holding tank, said air injector nozzle having been also connected to the steel shots holding tank in a suitable manner, suitable pressure regulating valves in association (i) with the compressed air supply injector to the said enclosure and (ii) with the supply pipe to the said shot holding tank such that tne air admitted into the air injector nozzle is at a higher pressure than the air admitted into the said tank, the leading end of the said enclosure being connected to a shot and tar dust collection unit there being provided means for removing dust and steel shots separately.
8. A device as claimed in Claim 7, wherein the refractory nozzle to be cleaned is preferably
refractory nozzle having tar deposited in the bore
9. A device as claimed in Claim 7, wherein the refractory nozzles are arranged with the
nozzle tip of all the nozzles facing one direction and each tip abutting against the base of the bore
of the immediately next nozzle in the air flow direction such that there is continuity of bore
passage.
10 A device as claimed in Claim 7 wherein the base of the trailing or last nozzle of the.
nozzle is in contact with the air passage of the air injector nozzle unit and is in the axial direction of the compressed air.
11. A device as claimed in Claim 10 wherein at a suitable place in the air injector nozzle, after the
pressure regulator there is connected a steel shot valve attached to the lower end of a shot
holding tank.
12. A device as claimed in Claim 7 wherein the area where the steel shots will enter into the air
injector nozzle, is provided with an enlarged sections.
9

-10-
13. A device as claimed in claim 12 wherein the top of the steel shot holding tank is
provided with a shot charging mouth and a compressed lair inlet
14. A device as claimed in claim 13 wherein air inlet is connected by suitable pipe
means through a pressure indicator and a pressure regulator to the compressed air
supply source.
15. A method of preparing cleaned refractory nozzles from tar impregnated
refractory nozzles substantially as herein described
16. A device for preparing cleaned refractory nozzles from tar impregnated
refractory nozzles substantially as herein described with reference to the
drawings accompanying the provisional specification.
There is proposed a method of preparing cleaned refractory nozzles from tar impregnated refractory nozzles which comprises in accommodating the tar refractory nozzle to be cleaned in an enclosure and impinging or spraying on the target area a steady stream of metal shots, preferably steel shots using high pressure air, separating the metal shots and the dust, the operation being carried out until the desired result has been obtained followed by recovering the cleaned refractory product. There is also proposed a suitable device therefor.

Documents:

00103-cal-1999-abstract.pdf

00103-cal-1999-claims.pdf

00103-cal-1999-correspondence.pdf

00103-cal-1999-description(complete).pdf

00103-cal-1999-description(provisional).pdf

00103-cal-1999-drawings.pdf

00103-cal-1999-form-1.pdf

00103-cal-1999-form-2.pdf

00103-cal-1999-form-5.pdf

00103-cal-1999-g.p.a.pdf

00103-cal-1999-letters patent.pdf

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Patent Number

200918

Indian Patent Application Number

103/CAL/1999

PG Journal Number

N/A

Publication Date

19-Jan-2007

Grant Date

19-Jan-2007

Date of Filing

12-Feb-1999

Name of Patentee

TATA REFRACTORIES LIMITED

Applicant Address

P.O. BELPAHAR, DIST. JHARSUGUDA,

Inventors:

#	Inventor's Name	Inventor's Address
1	BISWAJIT GHOSH	B-9/146, KALYANI, DISTRICT-NADIA, WEST BENGAL-741235, INDIA
2	ALOK KUMAR ROYCHOUDHURY	QUARTERS NO. M2, TRL TOWNSHIP, P.O. BELPHAR, DISTRICT-JHARSUGUDA, ORISSA-768218
3	GOPINATH NAYAK	QUARTERS NO. G-9, TRL TOWNSHIP, P.O. BELPHAR, DISTRICT-JHARSUGUDA, ORISSA-768218
4	PRANA BANDHU ROUTRAY	A/T-BAHARBIL, P.O. DHUSURI, DISTT. BHADRAK

PCT International Classification Number

B08B 5/02;B08B 9/027

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA