Title of Invention

AN IMPROVED APPARATUS FOR SIMULTANEOUS DETERMINATION OF MICROSTRENGTH OF UPTO TWELVE COKE SAMPLES

Abstract An improved apparatus for simultaneous determination of microstrength of upto twelve coke samples, comprising six pairs of test tubes (9, 11), each pair of said test tubes being mounted with their axes mutually at right angles on an arm set (12), one end of which being mounted in bearing (6A) supported on stand (1), and the other end of which being fixed to a disc (13) which is coaxially fitted in a vertical plane on a horizontally disposed shaft (10), characterised in that shaft (10) is rotatably mounted in bearings (6A, 6B and 6C), and that the end of shaft (10) which is mounted in bearings (6B and 6C) is rotatable by means of a D.C. motor (5) which along with its electronic parts is housed in a steel box acting as a support for the end of shaft (10) mounted in bearings (6B and 6C) to prevent wobbling of the test tubes during testing the microstrength of upto twelve coke samples at a time and to reduce thereby the errors in the test results obtained on the apparatus.
Full Text The present invention relates to an improved apparatus for simultaneous determination of microstrength of upto twelve coke samples.
Coke is used in the blast furnace for reducing iron ore. To a large extent, the performance of a blast furnace is dependent on the strength of the coke used. Coke is a highly-porous substance. A piece of coke is made up of the actual coke matter (pore wall) and the pores themselves. The strength of a piece of coke as required in a blast furnace is dependent on: (a) Its porous characteristics and (b) The strenth of its pore wall.
Microstrength of coke defines the strength of the pore wall only as opposed to the strength of a piece of coke taken as a whole. Hence, the microstrength index is used as a measure of the intrinsic strength of coke.
The existing apparatus for determining microstrength
of coke comprises two cylindrical tubes which are disposed at
right angles to each other and mounted rotatably at their central
short axes on a shaft which is supported at its one end by a pair
of plumber blocks and a pulley. Each tube is filled with five
steel balls each of 15 mm diameter and the coke sample to be
tested. The open ends of each tube are closed with caps. The
two tubes are rotated at a specified speed around their short
axes by means of an electric motor and pulley-belt system. The
size distribution of the coke particles produced by the impact
between the steel balls and the coke sample after a given period
of rotation of the tubes determines the microstrength of the
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coke tested, finer particles indicating lower microstrength of the coke sample tested.
The drawbacks of the existing apparatus are: (a) a maximum of only two samples of coke can be tested at a time and (b) the tubes tend to wobble during testing because the rotating shaft to which they are attached is supported only at its one end in plumber blocks and therefore acts like a cantilever, and wobbling of the tubes causes the steel balls inside the tubes to move in planes inclined to the vertical plane, introducing errors in the test and affecting reproducibility of test results.
The object of the present invention is to provide an improved apparatus capable of testing microstrength of upto twelve samples at a time at a faster rate and preventing the wobbling of the tubes during the testing process.
The improved apparatus is provided with upto six pairs of test tubes, the tubes of each pair being disposed at right angles to each other on a common shaft which is rotatively held in bearings at both ends thereof. Each test tube is filled with five steel balls of diameter 15 mm and a sample of coke to be tested. The shaft attached to each of upto six pairs of test tubes is rotated at a specified speed for a given period by means of an electric motor. At the end of rotation of the test tubes the size distribution of the coke particles produced by the impact between the steel balls and coke sample in each tube is determined in a known manner to assess the microstrength of the coke samples, the samller size of particles indicating lower
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microstrength of the coke samples tested.
The invention is described fully and particularly in
an unrestricted manner with reference to the accompanying drawings in which -
Figure 1 is a front elevation of the existing apparatus;
Figure 2 is a side view of the existing apparatus; Figure 3 is a front elevation of the invented
apparatus; and
Figure 4 is a view at section X-X in Fig. 3.
Referring to Figs. 1 and 2, stand 1 supports D.C. motor 2 of power 225 W, drive pulley 3, which is connected to driven pulley 6 by means of belt 4 and body 5 of the apparatus. Two test tubes 11 are each provided with an arm set 12 and fitted mutually at right angles on disc plate 13 which is mounted in a vertical plane coaxially at one end of shaft 10 held in two plumber blocks 9 in a horizontal plane, the opposite end of the shaft being attached to pulley 6. A RPM counter/indicator 8 is connected to the shaft by means of pulley 7. The operation of the apparatus is controlled by means of control board 14.
Referring to Figs- 3 and 4, the invented apparatus comprises six pairs of test tubes (9, 11), each pair of said test tubes being mounted with their axes mutually at right angles on an arm set (12), one end of which is mounted in bearing (6A),
supported on stand (1), and the other end of which is fixed to a
disc (13) which is co-axially fitted in a vertical plane on a horizontally disposed shaft (10) which is rotatably mounted in
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bearings (6A, 6B and 6C), the end of shaft (10) mounted in bearings (6B and 6C) being rotated by a D.C. motor (5), which along with its electronic parts is housed in a steel box (not shown), acting as a support for said end of shaft (10) mounted in bearings (6B and 6C).
Because of the use of three bearings 6A, 6B and 6C for holding the shaft (10), the test tubes do not wobble during their rotation.
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We Claim :-
1. An improved apparatus for simultaneous determination of microstrength of upto twelve coke samples, comprising six pairs of test tubes (9, 11), each pair of said test tubes being mounted with their axes mutually at right angles on an arm set (12), one end of which being mounted in bearing (6A) supported on stand (1), and the other end of which being fixed to a disc (13) which is coaxially fitted in a vertical plane on a horizontally disposed shaft (10), characterised in that shaft (10) is rotatably mounted in bearings (6A, 6B and 6C), and that the end of shaft (10) which is mounted in bearings (6B and 6C) is rotatable by means/a D.C. motor (5) which along with its electronic parts is housed in a steel box acting as a support for the and of shaft (10) mounted in
bearings (6B and 6C) to prevent wobbling of the test tubes

during testing the microstrength of upto twelve coke samples at a time and to reduce thereby the errors in the test results obtained on the apparatus.

(B. L. BANERJEE)
of DePENNING & DePENNING
Agent for the Applicants.
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Dated this 26th day of June 1997.

An improved apparatus for simultaneous determination of microstrength of upto twelve coke samples, comprising six pairs of test tubes (9, 11), each pair of said test tubes being mounted with their axes mutually at right angles on an arm set (12), one end of which being mounted in bearing (6A) supported on stand (1), and the other end of which being fixed to a disc (13) which is coaxially fitted in a vertical plane on a horizontally disposed shaft (10), characterised in that shaft (10) is rotatably mounted in bearings (6A, 6B and 6C), and that the end of shaft (10) which is mounted in bearings (6B and 6C) is rotatable by means of a D.C. motor (5) which along with its electronic parts is housed in a steel box acting as a support for the end of shaft (10) mounted in bearings (6B and 6C) to prevent wobbling of the test tubes during testing the microstrength of upto twelve coke samples at a time and to reduce thereby the errors in the test results obtained on the apparatus.


Documents:

01219-cal-1997-abstract.pdf

01219-cal-1997-assignment.pdf

01219-cal-1997-claims.pdf

01219-cal-1997-correspondence.pdf

01219-cal-1997-description(complete).pdf

01219-cal-1997-drawings.pdf

01219-cal-1997-form-1.pdf

01219-cal-1997-form-2.pdf

01219-cal-1997-form-3.pdf

01219-cal-1997-pa.pdf

1219-cal-1997-granted-abstract.pdf

1219-cal-1997-granted-assignment.pdf

1219-cal-1997-granted-claims.pdf

1219-cal-1997-granted-correspondence.pdf

1219-cal-1997-granted-description (complete).pdf

1219-cal-1997-granted-drawings.pdf

1219-cal-1997-granted-examination report.pdf

1219-cal-1997-granted-form 1.pdf

1219-cal-1997-granted-form 2.pdf

1219-cal-1997-granted-form 3.pdf

1219-cal-1997-granted-letter patent.pdf

1219-cal-1997-granted-pa.pdf

1219-cal-1997-granted-reply to examination report.pdf

1219-cal-1997-granted-specification.pdf


Patent Number 195294
Indian Patent Application Number 1219/CAL/1997
PG Journal Number 30/2009
Publication Date 24-Jul-2009
Grant Date 28-Oct-2005
Date of Filing 26-Jun-1997
Name of Patentee STEEL AUTHORITY OF INDIA LIMITED
Applicant Address RESEARCH & DEVELOPMENT CENTRE FOR IRON & STEEL, ISPAT BHAWAN, LODI ROAD
Inventors:
# Inventor's Name Inventor's Address
1 BASUDEV CHAKRABORTY RDCIS/SAIL, DORANDA, RANCHI-834002
2 NIRMAL KUMAR GHOSH RDCIS/SAIL, DORANDA, RANCHI-834002
3 BADRI NARAYAN PRASAD RDCIS/SAIL, DORANDA, RANCHI-834002
4 LAKSHMANAN PARTHSARTHY RDCIS/SAIL, DORANDA, RANCHI-834002
5 SURESH PRASAD RDCIS/SAIL, DORANDA, RANCHI-834002
PCT International Classification Number G01N 3/56
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA