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है”ह”ह

IS 10856 (1993): Earth-moving machinery - Elevatingscrapers - Volumetric ratings [MED 7: Material HandlingSystems and Equipment]

IS 10856 : 1993 IS0 6484 : 1986

EARTH-MOVING MACHINERY - ELEVATING SCRAPERS - VOLUMmETRIC RATINGS

( First Revision)

UDC 621’878’6

@ BIS 1993

BUREAU OF INDIAN STANDARDS MANAK EHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

July 1993 Group Price 2

Bufk Handling Systems and Equipment Sectional Committee, HMD 7

NATIONAL FOREWORD

This Indian Standard which is identical with IS0 6484 : 1986 ‘Earth-moving machinery - Elevating scrapers--Volumetric ratings’, issued bythe International Organization for Standardiza- tion ( IS0 ) was adopted by the Bureau of Indian Standards on the recommen-dations of the Bulk Handling Systems and Equipment Sectional Committee ( HMD 7 ) and approval of the Heavy Mechanical Engineering Division Council.

This standard was first published in 1984. IS0 6484 : 1986 has been adopted during this revision.

The text of IS0 standard has been approved for publication as Indian Standard without deviations. Certain terminology and conventions are however not identical to those used in Indian Standards. Attention is particu!arly drawn to the following:

a) Wherever the words ‘International Standard’ appear, referring to this standard, they should be read as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practice is to use a point ( . ) as a decimal marker.

The concerned technical committee has reviewed the provisions of IS0 7133 ‘Earth-moving machinery - Tractor-scrapers - Terminology and commercial specifications’ referred in this adopted standard and has decided that it is acceptable for use in conjunction with this standard.

In reporting the results of a test or analysis made in accordance with this standard, if the final value, observed or calculated is to be rounded off, it shall be done in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )‘.

IS 10888’ : 1993 IS08484 :1988

Indian Standard

EARTH-MOVING MACHINERY - ELEVATING SCRAPERS - VOLUMETRIC -RATINGS

( First Revision )

1 Scope and field of application

This International Standard specifies a procedure for approximating .the volume of a typical material carried in the bowl of an elevating scraper. The volumes are based on the in- side dimensions of the bowl and a representative volume on top of the bowl. This rating method is intended to provide a consis- tent means of comparing capacities; it is not intended to define actual capacities that might be observed in any sbecific applica- tion.

2 Reference

IS0 7133, Earth-moving machinery - Tractor-scrapers - Ter- minolog y and commercial specifications.

3 Definitions

3.1 elevating scraper : Scraper, as defined in IS0 7133 with a powered mechanism fixed to the scraper bowl to assist in loading material.

3.2 elevating scraper components : Components as iden- tified in figures 1, 2 and 3.

4 Volumetric ratings

4.1 Positioning of the bowl

4.1 .I The bowl shall be positioned so that the lowest flat sur- face of the floor is horizontal or as close to horizontal as poss- ible.

4.1.2 The material discharging mechanism shall be positioned to give maximum volumetric capacity.

4.1.3 The elevating mechanism shall be positioned to give the minimum distance between the cutting edge and the path of the outer tips of the elevator. This position shall be within the manufacturer’s specifications.

4.2 Boundaries ~of the struck volume

The boundaries of the struck volume shall be defined by :

a) the interior surfaces of the bowl sides;

b) the interior surface of the rear of the bowl, or ejector mechanism;

cl the bowl floor;

d) the plane, perpendicular to the forward surface of the cutting edge, that passes through the centreline of the elevator idler (see figure 3);

e) the plane of, or linear extension of, thYe inner paths of the elevator flights adjacent to the load (s& figure 3);

f) the plane defined by the mean lines, i.e. those horizon- tal lines above which, in a side view of the bowl, there is an area of the bowl side equal to the non-bowl side area under the lines (see figure 3);

g) the vertical planes from the interior surfaces of the bowl sides to the plane of the mean lines.

4.3 Boundaries of the top (heaped) volulne

The boundaries of the top (heaped) volume shall be defined by:

a) the upper ~horizontal surface of the struck volume Isee~4.2 f)l;

b) the plane of, or linear extension of, the plane of the inner paths of the elevator flights adjacent to the load [see 4.2 e)l;

cl the tangential plane from the top~of the solid portion of the rear~of the bowl, or ejector mechanism, to the path of the outer tips of the elevator flights, where the point of tangency is at the upper end of the elevator (see figure 4);

The slope of this plane shall not be less than 3 : 1 (18,49 forward and upward from the top of the solid portion of the rear of the bowl or ejector mechanism. If the slope Is less than 3 : 1 this boundary plane shall be as defined in 4.3 d).

d) a plane of 3 : 1 (rear and down) slope tangent to the outer tipsbf the elevator flights that ends when it intersects the rear of the bowl;

e) planes of 1 : 1 (45’) slope in and up from the bowl side mean lines (see figure 5).

1

c

IS 10858 : 1993 IS0 6484 : 1986

4.4 Rated volume 5 Expression of volumetric ratings

The rated volume is the sum of the struck and top (heapedt 5.1 volumes.

Any published volumetric ratings shall be within If: 3 % of the volume determined by this procedure.

The effect of local discontinuities - gussets, supporting arms of the elevator in the scraper bowl, etc. - on these volumes shall be ignored.

5.2 Ratings for volumes less than 10 msshall be expressed to the nearest 0.1 ms while those larger shall be expressed to the nearest 0.5 m3.

Chains -,

9=-\ ‘- Elevators

i Cutting edge

Figure 1 - Elevating scraper

2

IS 10856 : 1993 IS0 8484 : 1988

rejector I

/ Floor

Figure 2 - Components of scraper bowls

See 4.2 el

/

Mean line

See 4.2 f)

Figure 3 - Boundaries of the strubk volume - Planes related to the elevator idler and flights

3

IS 10856 : 1993 IS0 6484 : 1986

See 4.3 cl

\

\

\

\

\

\ \

Figure 4 - Boundaries of the top (heaped) volume - Tangential plane

Mean line -

Figure 5 - Boundaries of the top (heaped) volume

Reprography Unit, BlS, New Delhi, lndia

Standard Mark

The use of the Standard Mark is governed by the provisions of the Bureau ofIn#ian Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously cheked by BIS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attenting to connected matters in the country.

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Revision of Indiau Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook’ and &Standards

sent BIS giving the following Monthly Additions’. Comments on this Indian Standard may be reference:

Dot : No. HMD 7 ( 0208 )

Aendments Issued Since Publication

Amend No. Date of Issue Text Affected

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