mfqwlS 9020:2002

(%mfVBilingual)[* 9129:1979* Wd’W 10618:1983

ai13ifa7wTma\~]

[SupersedingIS9120:1979andIS 10618:19;3]

‘w7mkTJ?m7

?TfRWRm-@ ~?fh(tr?R)— ~?n m @?Tlq

( Waiy@9w’r)

Indian Standard

POWER THRESHERS — SAFETY

REQUIREMENTS

( First Revision)

W&fRWICS 65.060.50

c3$TTTq32002

Wla-4mvqfimmmFr,9m13’? ?llF~wJf

* m 110002

0 BIS 2002

BUREAU OF IN DIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

,.

m/sqwtnber 2002 ~ & Price Group 6

(Reaffirmed - 2012)

i)

ii)

iii)

iv)

IS 9020:2002

‘wwkTm7z-

?ll% m ‘T@ ~?fh (a?R) — TJRIT m W%TTq

( ~.!ll?m)

Indian Standard

POWER THRESHERS — SAFETY

REQUIREMENTS

( First Revision)

lmiw

‘2TiR-4

-..

1 SCOPE

1.1 This Indian Standard specifies the safety

requirements of power thresher.

2 REFERENCES

2.1 The following Indian Standards contain

previsions which through reference in this text,constitute provision of this standard. At the time of

publication, the editions indicated were valid. All

standards are subject to revision and parties to

agreements based on this standard are encouraged to

investigate the possibility of applying the most recent

editions of the standards indkated- below:

[S No.

210:1993

816:1969

1363 (Part 1):

1992

1363 (Part 2):

1992

1363 (Part 3):

1992

1364 (Part 1):

1992

Title

Grey iron castings

revision)

~out-th

Code of practice for use of metalarc welding for general construc-

tion in mild steel (/lrst revision)

Hexagon head bolts, screws and

nuts of product grade C : Part 1

Hexagon head bolts

Hexagon head bolts, screws and

nuts of product grade C : Part 2

Hexagon head screws

Hexagon head bolts, screws and

nuts of product grade C : Part 3

Hexagon nuts

Hexagon head bolts, screws and

nuts of product grades A and B:

Part 1 Hexagon head bolts

1

1S 9020:2002

*m

?* IS No. Title

1364 (9TFT2): WqRR*q3ik**~?ti 1364(Part 2): Hexagon head bolts, screws and

1992 Q1-iiitFq ~(w)* z:$rPT2 1992 nuts of product grades A and B:

q?fl’d~~Part 2 Hexagon head screws

1364 (WJT3) : 3WFIt3q@17~*~?fht 1364(Part 3): Hexagon head bolts, screws and

1992 mti=ikq ~(h)&t7w:wr3 1992 nuts of product grades A and B:

q?wti=Part 3 Hexagon nuts

1364 (W 4) : WllKik3q&’R~*~?fPi 1364(Part 4): Hexagon head bolts, screws and

1992 fi=Rz, ~(ti)*w:$TFT4 1992 nuts of product grades A and B:

~?fl’dtitiw (m)Part 4 Hexagon thin nuts (cham-

fered)1364 (WT 5) : EFR*q&k**~?fFf 1364(Part5): Hexagon head bolts, screws and

1992 m-ii*, ~(ti)*w:mT5 1992 nuts of product grades A and B:

m?ti*~(WF@@@Part 5 Hexagon head screws (un-

chamfered)1691 : 1980 @6ii’6T&R~wH+lm 1691:1980 Cast iron and mild steel flat pulleys

m (~flWl) (second revision)

1891 (WT 1): %@i$+~dlTYiT&tT3&TFR

1994 @:wJTlwFrl=rmf*m

* (Zh17y?tkm-)

1929 : 1982 m~m+ftrqmrfmi

m+ft$Z(12*15~=WlT)

(m@@+’)

1977 : 1996 lmFIT*&mf%mmmT

m (~mm

2062 : 1992 mrT=q@mKtit*ftTqm(#f77

W-

2292 : 1974 mmwti*mim(w7r

me

2293 : 1974 fm-?fPi m’f&rTmff@i+i(QmT

mm

2494 (Wl):V-@ 3hf@FF%Rifti~ThT

1994 Tfwv-wq: wrlwmrmitwr

@ (~@ml)

2637 : 1991 s@r?cmiR +ttFR*, xiFrwh

ditT$Frm (m@w’)

1891 (Part 1): Conveyor and elevator textile

1994 belting : Part 1 General purpose

belting (fiiurth revision)

1929:1982 Hot forged steel rivets for hot clos-

ing (12 to 36 mm diameter) (firsr

revision)

1977:1996 Low tensile structural steels (third

revision)

2062:1992 Steel for general structural purpose

~ourfh revision)

2292:1974 Taper keys and keyways (first

revision)

2293:1974 Gib-head keys and keyways @rst

revision)

2494 (Part 1): V-belts — Endless V-belts for

1994 industrial purposes : Part 1

General purpose belts (second

revision)

2585:1968 Black square bolts and nuts (dia

range 6 to 39 mm) and black square

screws (dia range 6 to 24 mm) (first

revision)

2591:1982 Dimensions for hot rolled steel

bars for threaded components

(second revision)

2637:1991 Steel roller chains Type S and C

attachments and chain wheels (@r

revision)

2693:1989 Power transmission — Bush type

flexible couplings (second revision)

---zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA-“

2998: 1982 ?ti (* -) + ftF! W@ 2998:1982 Cold forged steel rivets for cold

ti?(WIH &R&(l#16f%$t closing (1 to 16 mm diameter) (first

am) (WTwyl??wl)revision)

2

IS 9020:2002

*W3138 : 1966

3142 : 1993

4454 (m 1) :

1981

4454 (w-P12) :

1975

4773 : 1979

5669 : 1987

5932 : 1970

7461 (WT 1) :

1993

7461 (WJ12) :

1993

7461 (WJT3) :

1993

8132 : 1999

9019 : 1979

?tki%q4FFzaT 7-3m @J?r)-31=a#Ff

IS No.

3138:1966

3142:1993

4454 (Part 1) :

1981

4454 (Part 2) :

1975

4773:1979

5669:1987

5932:1970

7461 (Part 1):

1993

7461 (Part 2):

1993

7461 (Part 3):1993

8132:1999

9019:1979

Title

Hexagonal bolts and nuts

Pulleys — V grooved pulleys for

endless V-belts sections Z, A, B,

C, D and E and endless wedge

belts sections SPZ, SPA, SPB and

SPC (second revision)

Steel wires for cold formed

springs: Part 1Patented and cold

drawn steel wires — Unalloyed

(second revision)

Steel wires for cold formed

springs : Part 2 Oil hardened and

tempered spring steel wire andvalve spring wire — Unalloyed

(fht revision)

Plumber blocks for rolling bear-

ings (first revision)

General plan of boundary

dimensions for radial rolling bear-

ings (/W revision)

Boundary dimensions for thrust

ball bearings with flat seats

General plan of boundary

dimensions for tapered roller bear-ings : Part 1 Single row bearings

(second revision)

General plan of boundary

dimensions for tapered roller

bearings : Part 2 Double row

bearings (second revision)

General plan of boundary

dimensions for tapered roller bear-

i~gs: Part 3 Flanged cups (second

revision)

Tractors and machinery for

agriculture and forestry, powered

lawn and garden equipment —

Operator’s manuals — Content

and presentation (second revision)

Code of practice for installation,

operation and preventive main-

tenance of power threshers

3 TERMINOLOGY

3.0 For the purpose of this standard in addition to

the definition given in IS 9826, the following defini-

tions shall apply.

3.1 Prime Mover

A power source used for operating the thresher, such

as electric motor, tractor or stationary engine etc.

-----

+“-4IS 9020:2002

3.2 Transmission System

Any shaft, wheel, drum, pulley, system of pulleys,

coupling, clutch, driving belt and chain or other

appliance or device by which the motion of a prime

mover is transmitted to or received by the power

thresher and its any component.

4 MATERIALS

4.1 Material for construction of different components

shall be selected from those given in COI3 of Table

1. The material should, as for as possible, conform to

the Indian Standards given in COI4 of Table 1.

Table 1 Material Used for Various Parts of

Power Thresher

m. $TPIWwf W14 Ti’?’Mlw-dkrm3 sl Name of Part Material Ref to IndianNo. Standards

(2) (3) (4)(3) (4)

(1)

Frame

Shaft

Concave

Threshing drum Mildsteel 1S2062or

Blower 1s 1977

Sieve

Beater arm

Fly wheel Cast iron 1s210Pulley Castiron 1s210

Mildsteel 1S2062or1S1977

0

ii)

W&H 2062 31’tWf iii)

%S-?4’m W&W 1977 iv)

v)

vi)

vii)

miim WF$!w210 viii)

mm W@qi 210 ix)

@ iflwrdwl mm W&H 2062 or x) Transport wheel

W@!731977

mm WI’RW21O

Wgm -

xi) M Tl=hm W1’&W2591

xii) @ (WT$?RT) Whm W&W 2591

Cast iron 1s210

Pneumaticwheel —

xi) Beater Carbonsteel 1S2591

xii) Spikes Carbon steel IS 2591

----

.,

4.2 Material for various components of different

types of feeding systems are given in Annex A.

4.3 The bearings, plumber blocks, keys, belts and

*Wmw7tr4@ *twymF?R7rrRqIWm pulleys, chain, rivets and bolts shall conform to

*WT%f*@*a@?lrelevant Indian Standards. A list of such standards is

given below. .

~–- 1929 @7* 2998 I 4.3.1 Rivets — IS 1929 and IS 2998.

G%?’—M&H 1363 ($lFf 1, 2 ?r?k 3), * 4.3.2 Bolts — IS 1363 (Parts 1, 2 and 3), IS 1364

4.3.1

4.3.2

1364 (~ 1 # 5), W&H 2585 ~ & 31381

@–3_TE@jH 2494 (WTl)l

*W—* 1891 (WJT1)1

@–W#QIT 1691 &1’T31T@fT31421

*–*2292C$$731Ti& 22931

(Parts 1 to 5), IS 2585 and IS 3138.

4.3.3 4.3.3

4.3.4

4.3.5

4.3.6

4

Belts — IS 2494 (Part 1).

Conveyor Belt — IS 1891 (Part 1).

Pulley — IS 1691 and IS 3142.

Key — IS 2292 and IS 2293.

4.3.4

4.3.5

4.3.6

)., r

. A

IS 9020:2002

4.3.7 Bearing and Block — IS 7461 (Parts 1 to 3),

IS 4773, IS 5669 and IS 5932.

5 GENERAL REQUIREMENTS

5.1 Fastening connections between different

components shall be made in such a way that they

will not get loosened due to vibration or such

other forces as may occur during normal operation.

5.2 The thresher shall be so designed that general

maintenance, inch.dhg cleaning, replacement of

parts can be done without damage to the components

or danger to the operator.

5.3 Proper arrangements for lubrication of moving

components shall be provided. All points requiringfrequent lubrication shall be easily accessible. In case

of bearings where these are inaccessible or in an

hazardous position and require frequent lubrication,

the means of lubrication shall be located in an

accessible position and the lubricant piped into the

bearing.

5.4 Bearings shall be adequately protected against

the ingress of dust.

5.5 In case the prime mover is to be mounted on the

thresher, a protective cover shall be provided to

prevent it from dust or straw falling on it and to ensure

operator’s safety.

5.6 Provisions shall be made for tightening of the

belts.

5.7 Threshing drum shall be statically balanced.

5.8 Provision for easy adjustments of concave

clearance, airflow rate, screen pitch, sieve speed,

eccentricity of shaking mechanism, sieve clearance,

etc, should be made.

5.9 Provision for easy transportation of the thresher

and towing with the tractor shall be provided.

5.10 Each thresher shall be provided with an

o~rator’s manual. (see IS 8132 and IS 9019) in

Hindi or English or any other vernacular language.

5.11 All the required tools for operation,

maintenance and adjustment of various components

of the thresher shall be supplied by the

manufacturers.

5.12 The thresher shall be run idle (without load) for

at least 5 minutes at the specified speed of threshing

cylinder to check the following:

a)

b)

c)

c

There shall not be any undue knocking or

rattling sound,

Drive belts shall not slip frequently,

Fan shall run without any significant vibra-

tions,

Y--

,..-

d) Sieve shall oscillate smoothly, and

e) Thresher shall not vibrate unusually.

6 GUARDING OF TRANSMISSION SYSTEM

6.1 Guards shall be provided on all moving parts of

the thresher to prevent accidental contact of persons

or parts of clothing being caught. In case of PTO

driven threshers guards shall be provided on the PTO

shaft.

6.2 The guards shall be made of blind sheets of mild

steel (see IS 2062) having a minimum thickness of

1.6 mm.

6.3 The guards shall be so designed as not to hinder

in easy adjustment, servicing and operation of the

thresher.

6.4 All guards shrdl be either permanently attached

or firmly secured to prevent their removal without

the aid of tools. The servicing and adjustments should

be possible without complete removal of the guatds.

7 FEEDING SYSTEMS

7.1 The feeding system in power threshers shall be

of the following types and shall conform to the

requirements given in Annex A.

a) Chute,

b) Hopper,

c) Conveyor, and

d) Feed roller.

7.1.1 The recommended feeding system for various

types of threshers are given in Table 2 for guidance.

Table 2 Recommended Feeding Systems

S1No. Type of Thresher Type of Feeding Systems(1) (2) (3)

i) Hammermilltype Chute

ii) Drumy type do

iii) Chaff-cutter type Feed roller with chute or conveyor

iv) Spiketoothtype Chute,hopperor conveyor

V) Rasp-bar type do

NOTE — Hopperand conveyor in spike tcmth type threshers

should normally he used if the power rating is 7.5 kW or more.

W1’aalaafam

8 WORKMANSHIP AND FINISH

8.1 Welding used for joining different components

should be done in accordance with IS 816.

6

,.=----’

.J

.

.,,

I

Is 9020:2002

.

i

8.2 The components shall be free from rust and

shall have protective coating to prevent corrosion and

surface deterioration in transit and storage.

8.3 The components should be free from pits, burrs

and other defects that may be detrimental for their use.

9 MARKING

9.1 Each thresher shall be marked with the

following particulars:

a)

b)

c)

d)

e)

M~nufacturer’s name and his recognized trade-

mark, if any;

Model number

Batch or code number, or S1No. if any;

Power rating, kW; and

Revolutions per minute of the threshing drum

and its direction of rotation.

9.2 Each thresher shall be fitted with a label/plate

containing cautionary notices written in vernacular

language and their pictorial representation as givenin Annex B.

9.3 BIS Certification Marking

Each thresher may also be marked with the Standard

Mark.

9.3.1 The use of the Standard Mark is governed by

the provisions of the Bureau of Indian Standards Act,

1986 and the Rules and Regulations made

thereunder. The details of conditions under which

the Iicence for the use of the Standard Mark may be

gmnted to manufacturers or producers may be

obtained from the Bureau of Indian Standards.

,-

7

IS 9020:2002

WJitT‘w

-n--

(-4.2 & 7.1)

*?T?* m***

ANNEX A

(Clauses 4.2 and 7.1)

REQUIREMENTS FOR FEEDING SYSTEMS OF POWER THRESHERS

T-1 .2 m

T-1.3 m

ai. u.m-w~w T ?#$m-Wlm, fam m m fw F@

(1) (2) (3) (4) (5) (6)

i) 3.7 500 200 50 125

ii) 5.5 550 200 60 175

iii) 7.5 600 220 60 190

iv) 11 &’)T31f@5 650 220 60 200

A-1 FEEDING CHUTE

A-1.l Material

Mild steel sheet (see IS 2062) shall be used in the

manufacture of the feeding chute. The thickness of

sheet shall not be less than 1.6 mm.

A-1.2 Shape

The shape of the chute shall be as shown in Fig. 1.

A-1.3 Dimensions

A-1.3.1 The total length of chute, length of covered

portion (see B and Din Fig. 1) shall be 900 mm, Min

and 450 mm, Min respectively. The angle of lift of

covered portion (see ~ Fig. 1) shall be between 10°

to 30°. However, the length of the covered portion

of chute for chaff-cutter type thresher shall not be less

than 550 mm.

A-1.3.2 Other dimensions, when read in conjunction

with Fig. 1, for feeding chute of hammer mill type,

drummy type and chaff-cutter type threshers of

various power ratings are given in Table 3 for

guidance.

Table 3 Recommended Dimensions of Chute for

Hammer Mill, Drummy and Chaff-Cutter Type

Threshers

S1 Size of the Prime A c E FNo. Mover for mm mm mm mm

the Thresher, kW(1) (2) (3) (4) (5) (6)

i) 3.7 500 2tXl 50 125

ii) 5.5 550 2(K) 60 175

iii) 7.5 600 220 60 190

iv) 11 and above 650 220 60 200

A-1.3.3 Other dimensions, when read in conjunction

with Fig. 1 for chute of spike-tooth cylinder type

thresher of various power ratings are given in

Table 4 for guidance.

,.. --’

,

.,

8

FIG. 1 AN IMPROVED FEEDING CHUTE

COVERED PORTION —?61 @ll W

T–A

+–B

@?-c

8–D

+–E

Is 9020:2002

1A

,.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA---’

,

9

IS 9020:2002

alRFK14wl%K gyRRlwzlwiM?aa**

m@fkrwnq

(WW%-1.3.3)

Table 4 Recommended Dimensions for Chute for

Spike Tooth Cylinder Type Threshers

(Clause A-1.3.3)

*.!aTmqT? ail c’ at .#TJTLamfi17, fm7fm$tiwiwr @Ffr

(1) (2) (3) (4) (5) (6)

i) 3.7 440 350 60 190

ii) 5.5 480 400 60 190

iii) 7.5 540 480 60 190

iv) 11 ** 590 530 60 210

S1 Size of the Prime A c E FNo. Mover for Threaber

kW mm mm mm mm(1) (2) (3) (4) (5) (6)O 3.7 350 60 190

ii) 5.5 4s0 400 60 190

iii) 7.5 540 4s0 60 190

iv) 11 and above 590 530 60 210

A-1.4 Other Requirements

A-1.4.1 To facilitate easy and smooth feeding of the

crop during operation, the feeding chute shall be

properly mounted on the thresher. In the mounted

position, angle ct (see Fig. 1) shall be kept as unde~

a) For hammer-mill and drummy-type threshers

— 10° to 15°

b) For chaff-cutter type threshers — o“ to 5°

c) For spike tooth type threshers — 10° to 15°

A-1.4.2 No sharp edges shall be provided on the

feeding chute.

A-1.4.3 The covered portion of the chute shall be

rigidly attached and shall not be able to be detached

without cutting.

A-1.4.4 The feeding chute shall be so fixed with the

thresher that it is not possible to remove it easily.

A-2 FEEDING HOPPER

A-2.1 Material

A-2.LI Hopper — Mild steel sheet (see IS 2062)

shall be used. The thickness of the sheet shall not be

less than 1.6 mm.

A-2.1.2 Star Wheels — Cast iron (seeIS210) shall be

used.

A-2.13 Star Wheel Shafi — Mild steel rod (see

IS 2062) shall be used.

A-2.2 Shape

The sliapeof the hopper unit shall be as shown in Fig. 2.

A-2.3 Dimensions

A-2.3.1 The dimension A in Fig. 2 shall be 400 mm

more than the length of the threshing cylinder and shall

be declared by the manufacturer.

A-2.3.2 The thickness of sheet for the hopper shall be

1.6 mm.

A-2.3.3 ‘fhedimensionsofrhehopperandstarwheelswhen

A inconjunctionwithFig.2 shallbe as giveninTable5.

10

IS 9020:2002 +-4

1

~M~

f

FEEDING HOPPER

. -----

LT~R~s~l~G cyL~~ogR

*2 w’TJ’ri$m$mTJT

FIG.2 DETAILS OF FEEDING HOPPER

STAR WHEEL SHAIT

FEEDING HOPPER

S+AR WHEEL

THRESHING CYLINDER

a —G

71:

m —Lw —M

11

IS 9020:2002

*5m3fklzr?**wlPl

(7?W6-2.3.3)

T--”-

T. *. it?rl * far! G? ?/7 3? imtiwrx

mq??=l WWwm f5

m, Eli?l’1 Mmmmmm mm

(1) (2) (3) (4) (5) (6) (7) (8) (9) (lo)

i) 7.5 900 180 340 425 280 45 20 50

ii) 11 900 200 370 500 280 45 20 50

iii) 15 925 220 400 535 280 45 20 50

iv) 18.7 &R C@l’T 950 240 430 565 280 45 20 50

m-mw*m* 7.5hw**mm*aw%*%l

Table 5 Dimensions of Hopper and Star Wheel

(Clause A-2.3.3)

S1 Size of the Prime B c D E F G H aNo. Mover for Thresher Min Min Min Min *5

kW mm mm mm mm mm mm mm deg

(1) (2) (3) (4) (5) (6) (7) (8) (9) (lo)

i) 7.5 900 180 340 75 280 45 20 50

ii) 11 900 200 370 500 280 45 20 50

iii) 15 925 220 400 535 280 45 20 50

iv) 18.7 and above 950 240 430 565 280 45 20 50

NOTE — Hopperfeedingsystem is normally used with the threshers of 7.5 kW or more power ratings.

A-2.3.4 Mounting Dimensions

A-2.3.4.1 The feed hopper shall be built as an integral

part of the thresher.

A-2.3.4.2 The Iw&ationof the star wheels in relation

to hopper sides (see J in Fig. 2) shall be 75 mm. The

centre to centre dkmce of two star wheels (see K in

Fig. 2) shall be 220 mm.

A-2.3.4.3 The fixation of star wheel shaft in hopper

(see L in Fig. 2) and fixation of star wheel in relation

to centre of threshing cylinder (see M in Fig. 2) shall

be 350 mm and 450 mm respectively.

A-2.4 Other Requirements

A-2.4.1 The hopper shall be attached on the top of the

threshing cylinder or on the side. If it is attached on

the sides a feed regulating shaft shall be provided and

it shall be operated at a speed of 25 to 55 rpm.

A-2.4.2 No shaxp edges shall be provided in hopper

or on star wheels.

A-2.4.3 The casting shall be smooth and shall not be

porous.

!\\.’

.“

1.‘.

‘w’,,

j

.----

12

IS 9020:2002-_+-a—.

3-2.5 W ~ ~ WIW 3R JiW17& W @ W A-2.5 Other types of feeding mechanisms may also

wd-J-rmmrrwTJTammTJTg&*lmT be used with feeding hoppem. A typical shape of the

**qm-m3a4hHl~hhopper unit with feed roller type feeding meehanism

Zi’WW7@i7@Tf R!R*mmwis shown in Fig. 3. The material and dimensional

requirement of feed roller type feeding mechanism areT-2.5.1 @7 =-2.5.2 ti ~ @ %I given in A-2.5.1 and A-2.5.2.

m

FEEDING HOPPER

o

THRESHING

CYLINDER

FIG.3 DETAILS.OFFEEDINGHOPPERWITHFEEDROLLER

mm. FEEDINGHOPPER-WJrm. FEED ROLLER

v m —FC: 77 —G

?ft-c $ —J

8—D ‘# —K

$–E m —L

T-2.5.1 W@ A-2.5.1 Material

@’W,~~~W~%@~~@ The material for the construction of hopper, feed

d$wTtis’wT3(W&W2062@)~*~Wl ~~2062)rollers and feed roller shaft shall be of mild steel (see

13

,-----

IS 9020:2002

L ‘

9 t%

=-2.5.2 3TRiT4 A-2.5.2 Dimensions

3-2.5.2.1 f?H2~~m~wTwTA~@%I’@~?R A-2.5.2.1 The dimensions A in Fig. 2A shall be

@i m @ FFS!T$~ 400 m - * ~ ~ @Ommmorethant helengthofthet hreshingcylinder

-mm* Gilqland shall be declared by the manufacturer.

T-2.5.2.2 ‘df47 ~ ~ !WJt5 ~ @ 7il?7 ~ WJT A-2.5.2.2 Thethickness ofsheet forhopper shall be

~1.6~~1 1.6 mm, Min.

%-2.5.2.3 %T 3 ~f?_@ll!TIT#w ?hW_Wh$ A-2.5.2.3 The dimensions of the hopper and feed

3TRiT4Hlft$%T 6tif@71q TTr#i&3F@R#l rollers when read in conjunction with Fig. 3 shall be

as given in Table 6.

O 15 740 150 545 560 300 100 15 55

ii) 26.3 900 200 560 570 300 100 15 55

iii) 37.3 925 230 570 580 300 100 15 55

Table 6 Dimensions of Hopper and Feed Roller

(Clause A-2.5.2.3)

sl Size of the Prime B c D E F G HNo. Mover for Thresher, kW

cr.

Min Mill Min Min *5mm mm mm mm

(1)

mm mm mm

(2) (3)deg

(4) (5) (6) (7) (8) (9) (lo)

i) 15 740 150 545 560 300 100 15 55ii) 26.3 900 200 560 570 300 100 15 55iii) 37.5 925 230 570 580 300 100 15 55

NOTE — Hoppr feeding system with feed roller type feeding mechanism is normally used with thresher of 15 kW or more

power ratings.

%-2.5.2.4 ~ ~ W ~ &i17~ * %5 & A-2.5.2.4 The feed hopper shall be built as an integral

matiml part of the thresher.

A-2.5.2.5 The location of the feed rollers in relation

to hopper sides (see J in Fig. 3) shall be 90 mm. The

centre to centre distance of two feed roller rods (see

Kin Fig. 3) shall be 355 mm.

A-2.5.2.6 The fixation of feed roller in hopper (see L

in Fig. 3) and fixation of feed roller in relation to

centre of threshing cylinder (see M in Fig. 3) shall

be 125 mm and 450 mm respectively.

A-2.5.2.7 No sharp edges shall be provided in hopper

or on feed rollers.

A-3 POSITIVE FEED ROLLERS WITH

CONVEYOR OR CHUTE

14

T-3.1.3

T-3.1.4

3+3.1.5

3-3.1.6

l)i%jl

T-3.1.7

%-3.1.8

T-3.1.9

a7FFi5-?ki’T-aad FilFT(wl&w210@)l

?iw?k77- Raal Fit3r(371fqH 210at$l

%’7JT?k’7- @FilFr(*210w)l

FF?wl&’T -&lwnH[*4454(wr

W*–~W(ti2062~l

*-za7iftiFr (@wr210t@l

@77@aT-@*(*21012@l

IS 9020:2002

A-3.O The system is used on a chaff-cutter typethresher. It comprises a feed pressing roller, two

corrugated feed rollers and a feeding chute orconveyor with power transmission system. For this

type of threshers with power ratings, of 15 kW or

more, a feed reversing mechanism is recommended.

It comprises a gearbox, a clutch lever and two joining

shafts with universal joints (see Fig. 4), In some

threshem fast and loose pulleys to cut-off thedrive to the upper and lower feed rollers are also used.

In the feeding system with feed reversing mechanism,

if the hand of an operator gets entrapped, the clutch

lever is pressed by his hand or shoulder and the drive

to the feed roller is cut-off in the neutral position or

the direction of the upper and lower feed rollexs is

reversed.

A-3.1 Material

A-3.1.1 Chute — The chute shall be made of mild

steel sheet (see IS 2062) having thickness of not lessthan 1.6 mm.

A-3.1.2 Conveyor— Canvass or rubber [see IS 1891

(Part 1)] or steel slats (see IS 2062).

A-3.1.3

A-3.L4

A-3.1.5

A-3.1.6

Driving Roller — Cast iron (see IS 210).

Pressing Roller — Cast iron (see IS 210).

Feed Rollers — Cast iron (seeIS210).

Tension Spring — Spring steel [see IS 4454(Part l)].

A-3.1.7 Clutch Lever — Mild steel (see IS 2062).

A-3.1.8 Gears — Cast iron (see IS 210).

A-3.1.9 Gear Box — Cast iron (see IS 210) or mild

steel (see IS 2062).

A-3.1.1O Gear Shajl — Mild steel (see IS 2062).

A-3.2 Shape

The shape of feeding system with feed reversing

mechanism used for chaff-cutter type threshers is

shown in Fig. 4.

A-3.3 Dimensions

A-3.3.1 If chute is used, the dimensions shall be as

given in A-1.3.1 and A-1.3.2 and the arrangement

should be as shown in Fig. 5.

A-3.3.2 If conveyor is used, the length of centre to

centre distance of conveyor rollers (see A in Fig. 4)

shall be minimum of 1200 mm. Minimum of450 mm of length of conveyor at feed inlet side shall

be covered.

15

Is 9020:2002

,,9

It /-TENSION SPRING

-A * I1: 1! ;

L--IL,-. --f

m4 =n%-zT$’? $t?17*fw*m@

FIG.4 FEEDREVERSINGDEVICEFORCHAFF-CUTTERTYPETHRESHERS

BEVEL PIN1ON

BEVEL GEAR

REVERSE GEAR

FEED REVERSING DEVICE

CLUTCH GEAR

UNIVERSAL JOINTSHA~

CLUTCHLEVER

CONSTANT MESH GEAR

FORWARD GEAR

TENS1ON SPRING

FEED REVERSING ROLLER

CANVASS FEED CONVEYOR

UPPER FEED ROLLER

LOWER FEED ROLLER

THRESHING CYLINDER

CHOPPING BLADES

DRIVING ROLLER

‘., .

IS 9020:2002

m$tm Frf@Rif4%l

*5 wwiiz7zr?Jfit? 17timwdwafyfkTwJrm

.M1dimensions in millimetres.

FIG. 5 SAFE FEEDING CHUTE USED ON A CHAFF-CTJITER TYPE THRESHER

m – Min

fPJfa$lm’G’

FRTwm-l173mr

WmTr?l

A-3.4 Feed Reversing Device

A-3.4.1 Functioning of Device (see Fig. 6)

Pinion ‘A’ receives the drive from the main shaft of

the thresher by means of chain and sprocket. Pinion

‘A’ meshes with bevel gear ‘B’ which is mounted on

a counter shaft. On the same shaft a spur pinion ‘G’

is mounted which slides on splines with the help of

a hand lever. When pinion ‘G’ meshes with the gear

‘F’ on the lower feed shaft, the lower feed roller

revolves in clockwise direction and the upper feed

roller in anti-clockwise direction. This is the feed-in

position.

A-3.4.1.1 When pinion ‘G’ is meshed with gear ‘C’,

the direction of rotation of the upper and lower rollers

is revemed. In other words, the upper roller rotates in

clockwise and the lower roller in anti-clockwise

direction. This is the reversed or feedback position

and the material being fed moves out instead of

moving into the threshing chamber.

A-3.4.1.2 The third position is when pinion ‘G’ does

not mesh either with gear ‘F or ‘C’. This is the

neutral position. The lever to slide pinion ‘G’ can be

actuated by hand or foot or shoulder.

I

17

IS 9020:2002

FORWARD SPEED REVERSE SPEEDzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA* PATH OF TRAVEL OF THE POWER

~ ROTATION OF GEARS AND SHAFTS

FIG. 6 POWER TRANSMISSION THROUGH FEED REVERSING SYSTEM FORCHAFF-CUITERTHRESHER

@@ — UPPERSHA~ T–A

zfiWQ?7g# — COUNTER SHAFT 8–B=flmqi — DRIVESHAFT #l-c

mql — LOWER SHAfW D* ti — FORWARDSPEED ::E~m ~ — REVERSESPEED —

7–;

+PATtf OF TRAVEL OF THE POWER + ?lf% %t * %t f%fTl

G ROTATION OF GEARS AND SHAFTS G @ * W * ~ * f??n

3-3.4.1.3 W ~ ~ WJjF ~ ~ _ -7 % A-3.4.1.3 The details of gears in this system shall be

RWTW31 as given in Table 7.

i71RlTf7*w@8JqYFwwm Table 7 Details of Gears in the Feed Reversing

Mechanism

mu. mwi#TfaifmlJl aK@Rim7FPTla S1 Type of Gear/ Designation Shaft on which

am No. Pinion Mounted

(1) (2) (3) (4)(1) (2) (3) (4)

i) *+IUT q %allwva’ta?nqi~ O Bevel gear A Splined shaft on main shaft

ii) @ * -- (@) ii) do B Counter shaft

iii) WTm 7$t r$K3WqTW iii) Spur pinion c Counter shaft

iv) ~ * a GQ?tmm@f iv) Spur gear D Upper feed roller shaft

vi) @ w f%fr$’TcJTtlaT@ vi) do F Lower feed roller shaft

vii) * * $ %?TlWqT6RTfT?11’W vii) Bevel gear G Splined shaft on main shaft

18

IS 9020:2002

A-3.4.2 Functioning of Device (see Fig. 7)

If the roller handle is put in backward direction, bevel

gear ‘A’ which is mounted on splined shaft receives

the drive from main shaft. The main shaft movingin anti-clockwise direction will rotate bevel gear

‘A’ also in anti-clockwise direction. Bevel gear ‘A’

meshes with bevel gear ‘B’ which is mounted on a

counter shaft, having at other end a pinion ‘C’. This

will rotate bevel gear ‘B counter shaft and pinion

‘C’ in clockwise direction. Gear ‘D’ meshes with

pinion ‘C’ and rotates in anti-clockwise direction.

Gears ‘D’ and ‘E are on the same shaft, hence the

direction of rotation of ‘E’ would also be the same.

Gears ‘E’ and ‘F mounted on upper and lower feed

roller shafts respectively, mesh with each othen

therefore the gear ‘F’ rotates in clockwise direction.

The direction of rotation of upper and lower feed

rollers would be the same as that of gears ‘E’ and ‘F’.

This is the feed-in position.

A-3.4.2.1 If the roller handle is put in forward

direction, bevel gear ‘G’, which is mounted on

splined shaft, receives the drive from main shaft and

moves in anti-clockwise direction. Bevel gear’ G’

meshes with bevel gear ‘B’. The bevel gear ‘B’,

counter shaft and pinion ‘C’ will rotate in

anti-clockwise direction. This will ultimately lead to

the rotation of lower feed roller in anti-clockwise

direction. This is the reversed or feedback position

and the material being fed moves out instead of

moving into the threshing chamber.

A-3.4.2.2 In case the roller handle is kept in central

position, feed-revecsing mechanism will not operate.

This is the neutral position.

A-3.5 Where conveyor feeding system is not

provided in a chaff-cutter type thresher nor the

chute is covered from top, a second set (secondary

set) of feed rollers shall be placed at 200 to 300 mm

axial distance to assist feeding of the crop to the

primary set of feed rollers. The top roller (which is

idle, that is, not driven positively) of the second set of

the rollers shall have moderate axial grooves and a

spring control to let the hand be withdrawn without

injury before the hand gets to the second set of rollers.

A-3.6 Other Requirements

A-3.6.1 All the sharp edges shall be avoided.

A-3.6.2 Castings shall be smooth and shall not be

porous.

A-3.6.3 The shifting of gear shall lx easy and smooth.

19

Is 9020:2002 k---%

+ ‘F

(Ip) — —i?’

j\

9 ‘“R/

ROLLER SHAFT

//

REVERSE M

4+

,

. F’ r-b

_ or————————————.7 7

_._. — .—. —

FORWARD MOTIONOIRECTION OF

ROTATIONOFMAIN 5HAFT

*

I

_.___ .—. — .—. —

COUNTER SHAFT

HANDLE1

~rUPPERFEEOROI.LER

,41RECTIONOF ROTArlONOF MAIN SHAFT—

I-:

‘p t . .~*-----;

I,

I[n : is “

t–-– –— ---- —--—-i

1,

——L_--_–-_;

?F

~--- &

@’+

@-+-

@

+

F

[ LOWER FEED ROLLER~LOWER RoLLER SHAFT

ROLLERSHAFr mm –

HANDLEWW-Z7$J8 —

ROLLERSHA~Mm

LEVERTtr8WJrh I

sPLINEDSHAFr3iT88Fi7y8 —

REVERSEMOTION%Ri$lm@ —

FORWARDMOTIONmwihw.

DIRECTION OF MAIN SHAFT

MAIN SHAFT

COUNI13R SHAFr

ROLLER HANDLE

UPPER FEED ROLLER

UPPER ROLLER SHAFT

LOWER ROLLER SHAFT

LOWER FEED ROLLER

*7 m-W3-Wl_Wam~w*M@*~~

FIG.7 WORKINGOFFEEDREVERSINGMECHANISMFORCHAFF-CUITER TYPE THRESHER

20

.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBAA

T-4.1.1

3-4.1.2

ai-4.l.3

?i’-4.l.4

IS 9020:2002

A-4 CONVEYOR FEEDING SYSTEM

A-4.O Conveyor system is generally used with spike

tooth or rasp-bar type threshers of power ratings of

5.5 kW or higher.

A-4.1 Material

A-4.1.1

A-4.1.2

A-4.1.3

A-4.1.4

Conveyor — Rubber [see IS 1891(Part 1)].

Fenders — Mild steel (see IS 2062).

Conveyor Roller — Cast iron (see IS 210).

Cover — Mild steel sheet (see IS 2062)

having thickness of 1.6 mm, Min. ‘

A-4.2 Shape

The shape of a conveyor system is given in Fig. 8.

A-4.3 Dimensions

A-4.3.1 The centre to centre distance of conveyor

roller (see A in Fig. 8), shall be minimum of1000 mm.

A-4.3.2 The length of covered portion of conveyor

shall be minimum of600 mm.

A-4.4 Other Requirements

A-4.4.1 All the sharp edges shall be avoided.

A-4.4.2 Castings shall be smooth and shall not beporous.

RASP /-CYLINDER.-Lvv EFt-1 BIIR> /

FENDER

–CONVEYOR

\\

ROLLER

1----- A ~

+=37 — FtZNt)ER m — COVER

w h — CONVEYORROLLER Iwm — RASPt3AR

m — CONEYOR — CYLINDER

r—A

~8%W17~it?17&ftP79RQl~tim

FIG.8 ARRANGEMENT FORFEEDINGCONVEYOR FORRASP-BAR TYPE THRESHER

21

-..-.$4

‘ j

I

-----

Farm Implements and Machinery Sectional Committee, FAD 59

FOREWORD

This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the draft finalized

by the Farm Implements and Machinery Sectional Committee had been approved by the Food and Agriculture

Division Council.

Mechanization of the threshing operations in the country also brought in its wake a chain of accidents to

falm workers resulting in their temporary or permanent disability. This brought to the fore the need for

some immediate measures to safeguard the farm workers against avoidable accidents be it due to any of thevulnerable factors of machine, man, etc. As a number of reports of many farm workers specially the young

losing their limbs poured in, the urgency to provide for safety provisions in the threshers became more

pronounced.

Punjab Agricultural University, Ludhiana conducted a survey on the accidents during the wheat threshing

season of 1976. 294 cases were examined and it was observed that the factors responsible for accidentsare as under:

Factors of Accidents Percentage

a) Human 72.9

b) Machine 12.9

c) Crop 9.0

d) Situational 5.2

This standard covers the safety aspects relating to the accidents arising out of machine factor. Human, crop

and situational factors have been covered in IS 9019: 1979 ‘Code practice for installation, operation and

preventive maintenance of power threshers’. This standard was first published in 1979.

This revision has been taken up due to foliowing reasons:

i) To incorporate, modifications suggested in Amendments No. 1 to 4;

ii) To incorporate the material requirements for various components of power thresheu

iii) To incorporate requirements given in IS 9129: 1979. ‘Technical requirements for safe feeding

systems for power threshers’ and IS 10618 : 1983 ‘Pictorial representation for cautionary

notices for power threshers’ to make the standard comprehensive and user friendly as these Indian

Standards were complementary to the earlier one; and

iv) To up-date the standard.

In the preparation of this standard, considerable assistance has been received from Punjab Agricultural

University, Ludhiana.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final

value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance

with 1S2: 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained

in the rounded off value should be the same as that of the specified value in this standard.

Bureau of Indian Standards

B1S is a statutory institution established under the Bureau of Jndian Standards Act, 1986 to promote

harmonious development of the activities of standardization, marking and quality certification of goods

and attending to connected matters in the country.

Copyright

B]S has the copyright of all its publications. No part of these publications may be reproduced in any form

without the prior permission in writing of BIS. This does not preclude the free use, in the course of

implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.

Enquiries relating to copyright be addressed to the Director (Publication’s), BIS.

Review of Indian 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

needecl; 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 Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No. FAD59(1060).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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