In exercise of the powers conferred by
sub-section (1) of section 36 of the Dangerous Machines (Regulation) Act, 1983
(35 of 1983), and in supersession of the Dangerous Machines (Regulation) Rules,
1984, except as respects things done or omitted to be done before such
supersession, the Central Government hereby makes the following rules, namely
1. Short title and commencement.--
(1)These rules may be called the Dangerous
Machines (Regulation) Rules, 2007.
(2)They shall come into force on such date
as the Central Government may, by notification in the Official Gazette,
specify, and different dates may be specified for different rules.
2. Definitions.--
In these rules, unless the context
otherwise requires,-
(a)"Act" means the Dangerous
Machines (Regulation) Act, 1983 (35 of 1983),
(b)''Form" means a form appended to
the First Schedule to the rules.
(c)"Schedule" means a Schedule
appended to these rules.
3. Form of licence issued under section 9.--
(1)Every licence issued to a person
authorizing him to manufacture, or to commence or to carry on business as the
manufacturer of any dangerous machine shall be issued in Form I.
(2)There shall be issued for each category
of dangerous machine, a separate licence and every such licence shall be issued
in Form I.
(3)Every licence to commence or carry on
business as a dealer of a dangerous machine shall be issued in Form II.
(4)Every licence referred to in sub-rule
(2) shall be valid for dealing with the types or models of dangerous machines
specified in the licence.
4. Standards and specifications of power threshers, power operated chaff cutter and sugarcane crushers.--
Every licence issued under rule 3 shall
ensure that the power thresher, power operated chaff cutter and sugarcane
crushers manufactured by him/her complies with the standards and specifications
laid down in the Second Schedule.
5. Modifications of existing dangerous machines how to be made.--
(1)Every person who has, immediately
before the commencement of the Act, in his/her custody or control any power
thresher, power operated chaff cutter and sugarcane crusher which does not
comply, in all respects, with the provisions of the Act, and the rules and
orders made thereunder, shall get it modified so as to ensure that the feeding
system conforms to the specifications laid down in the Third Schedule.
(2)The transmission system of every power
thresher, power operated chaff cutter and sugarcane crusher shall be provided
with suitable guards as specified in the Third Schedule.
The First Schedule
Form I
[See rule 3 (1) and (3)]
Form of licence for manufacture or
commencement of carrying on business as a manufacturer of a dangerous machine.
Licence
No ________
Whereas
M/S._________________________________
of
_____________________________has/have
(give
full address)
applied
for a licence for commencement of/ carrying on business as a manufacturer of
___________________________________________________
(here
specify which dangerous machine)
And
whereas the Controller is satisfied that the condition specified in clause
(a) of subsection (A) of section 9 or, as the case may be, subsection (4) of
section 9 has been complied with.
Now,
therefore, in exercise of the powers, conferred by section 9 of the Act,
licence is granted/renewed to M/s.
___________________________________________for a period of five years to
commence/carry on business as a manufacturer of the:
1.
2.
3.
(give
name of machine [power thresher, power operated chaff cutter, power operated
sugarcane crusher] and trade name with brief description and overall
dimensions)
This
licence is issued subject to the following conditions, namely:-
(1)
The manufacturer shall ensure that the machine and every part thereof
complies with the standards specified by rule 4 of the Dangerous Machine
(Regulation) (Amendment) Rules, 2007.
(2)
Without prejudice to the generality of condition number (1) above, the
manufacturer shall ensure that the following parts are secured by safeguard
of substantial construction -
(a)
the prime -mover and every part thereof;
(b)
the transmission machinery end every part thereof; and
(c)
every other dangerous part such as rollers, blowers, elevators, knife blades
and the like.
(3)
The manufacturer shall clearly and legibly provide the machine with danger
signals indicating the point beyond which no limb shall be inserted for the
purpose of feeding the machine or for any other purpose while the machine is
in operation.
(4)
The manufacturer shall ensure that the following particulars are legibly and
conspicuously marked or inscribed on every dangerous machine by such method
as would make it indelible, namely:-
(a)
the direction of the rotation and the number of rotations per minute;
(b)
its power requirements; and
(c)
the name and correct address of the manufacturer, the year of manufacture and
the date, number and other particulars of the licence of the manufacturer.
(5)
Every manufacturer shall supply along with each dangerous machine a manual
containing general instructions regarding the operation of such machine, in
Hindi and regional languages.
(6)
Before, transferring the possession of the machine whether by sale, lease,
hire or otherwise, the manufacturer shall deliver to the person acquiring the
machine a declaration to the effect that the machine conforms to the
standards laid down by or under this Act and also complies, in all respects,
with the provisions of the Act and rules and orders made thereunder.
(7)
Failure to comply with the conditions specified above or of any provision of
the Act or rule or order made thereunder will make this licence liable to
suspension or cancellation as provided in section 10.
[Nota
Bene - All references to the Act or any section thereof are references to the
Dangerous Machines (Regulation) Act, 1983 (35 of 1983) or the relevant
section thereof]
Granted
this ______________________day of___________________________
Place:
Designation
Date:
(Seal)
FORM II
[See rule 3 (3)]
Form of licence for commencement or carrying on business as
a dealer of a dangerous machine.
Licence
No._____________
Whereas
M/s ________________________of ______________________
(here
give full address)
has/have
applied for a licence for commencement of / carrying on business as a
And
whereas the Controller is satisfied that the applicant proposes to
commence/carry on business in _______________________________
(specify
which machine)
which
conform to the standards laid down by or under the Dangerous Machines
(Regulation) Act, 1983 (35 of 1983):
Now,
therefore, in exercise of the power conferred by sub-section (4) of section
9, licence is granted to M/s _______________________for a period of five
years to commence/carry on business as a dealer of:
Serial
Name of the
machine.
Make/model
Horsepower/kilowatt
Number
and brief
description
requirement of the
machine
(1)
(2)
(3)
(Specify, types of
threshers,
power
operated chaff cutter and power operated sugarcane crusher or other dangerous
machine)
This licence is
issued subject to the following conditions, namely:-
(1) The dealer
shall deal only in machines of a manufacturer licenced under the Act.
(2) Before
transferring the possession of any machine whether by sale, lease, hire, or
otherwise, the dealer shall deliver to the person acquiring the possession of
such machine, a declaration to the effect that the machine conforms to the
standards laid down by or under this Act and also complies with, in all
respects, the provisions of this Act and the rules and orders made
thereunder.
(3) Failure to
comply with the conditions specified above or of any provision of the Act or
rule or order made thereunder will make this licence liable to
suspension/cancellation as provided in section 10.
[Nota Bene: All
references to the Act or any section thereof are references to the Dangerous
Machines (Regulation) Act, 1983 (35 of 1983) or the relevant section thereof].
Granted this
_______________________day of __________________________
Date:
Designation
Place:
(Seal)
Top of Form
The Second Schedule
[See rule 4]
1.A power thresher shall comply with the
following Indian Standards as may be relevant:-
8.IS
1973: 1999 (Sugarcane Crusher - Specifications (third revision)Top of
Form
The Third Schedule
[See rule 5]
1.Every power thresher, power operated
chaff cutter and power operated sugarcane crusher referred to in rule 5 shall
be so modified as to ensure that the feeding system conforms to section 7 as
the case may be of IS 9020:2002, section 7.2, 7.3 of IS 15542: 2005 and section
5.1, 5.1.1, 5.1.2, and 5.2 IS 15561: 2005 of the Indian Standards respectively.
2.The transmission system shall be
provided with suitable guards as specified in section 6 of Indian Standards No.
IS: 9020 of 2002, section 8 of Indian Standards No. IS 15542: 2005 and section
6 of IS 15561: 2005 respectively.
3.The recommended dimensions of the chute
for Hammer-mill, Drummy and Syndicator type threshers are given in Table 1
below.
4.?The recommended dimensions of chute for spike
tooth cylinder type threshers are given in Table 2 below. The recommended
dimensions of the chute for power operated chaff cutter and power operated
sugarcane crusher is given in Table 3 and Table-4 below respectively. The
feeding hopper of the power thresher shall conform to section A-2 of ANNEX A of
IS 9020:2002. The positive feed rollers with conveyor or chute system used on
chaff-cutter type power thresher shall conform to section A-3 of ANNEX A of IS
9020:2002. The conveyor feeding system used with spike tooth or rasp-bar type
power thresher of power rating of 5.5 kW or higher shall conform to section A-4
of ANNEX A of IS 9020:2002. The recommended dimension of conveyor system for
power operated chaff cutter is given in Table-5.
TABLE 1
Recommended Dimensions of Chute for Hammer-Mill, Drummy and
Syndicator Type Threshers
Recommended Dimensions for Chute for Spike Tooth Cylinder
type Threshers
Serial
Size of the prime
A
C*
E
F
Number
mover for thresher
(1)
(2)
(3)
(4)
(5)
(6)
kW(HP)
mm
mm
mm
mm
(i)
3.7(5)
440
350
60
190
(ii)
5.5(7.5)
480
400
60
190
(iii)
7.5(10)
540
480
60
190
(iv)
11 (15) and above
590
530
60
210
NOTE:- A,C,E and F refer to the
dimensions as shown in the figure
TABLE 3
Recommended Dimensions of chute for power operated chaff
cutter. A
Serial Number
Description
Dimension
(mm)
(1)
(2)
(3)
(i)
Minimum length of chute
900
(ii)
Minimum thickness
of sheet metal of chute
1.6
(iii)
Minimum length of
chute cover
450
(iv)
Height of chute
from ground level
750
to 1100
TABLE 4
Recommended Dimensions of feed plate/chute for sugarcane
crusher
Serial Number
Description
Dimension
(mm)
(1)
(2)
(3)
(I)
Minimum thickness
of Sheet Metal of feed plate/chute
1.6
(ii)
Maximum opening for
feeding the cane in feed plate/chute
60
(iii)
The feed plate or
feed chute shall be covered on front for a minimum distance of
600
TABLE 5
Recommended Dimensions of conveyor system for power operated
chaff cutter
Serial Number
Description
Dimension
(mm)
(1)
(2)
(3)
(i)
Minimum length of
conveyer cover
1200
(ii)
Minimum length of
covered conveyer cover
450
(iii)
Minimum thickness
of sheet metal for cover
1.6
(iv)
Feed reversing
mechanism
Shall conform to
the
requirements
in ANNEX-A of IS
15542:
2005
(v)
Minimum thickness
of MS Sheet (IS: 2062)
1.6
for guard of
blower, if provided.
Annexure:
1.ANNEX A of IS 9020:2002
2.ANNEX A of IS 15542:2005
[F. No. 13-30/2005-My(I&P)]
PREM NARAIN, Jt. Secy.Top of Form
ANNEX A
(Clauses 4.2 and 7.1)
REQUIREMENTS FOR FEEDING SYSTEMS OF POWER THRESHERS
A-1 FEEDING CHUTE
A-1.1 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 Pig. 1.
A-1.3 Dimensions
A-1.3.1 The total length of chute,
length of covered portion (see B and D in Fig. I) shall be 900 mm, Min and 430
mm, Min respectively. The angle of lift of covered portion (see P 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
SI
Size of the Prime
A
C
E
F
No.
Mover for
mm
mm
mm
mm
the Thresher, kW
(1)
(2)
(3)
(4)
(5)
(6)
0
3.7
900
200
50
125
ii)
5.5
550
200
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.
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Table 4 Recommended Dimensions for
Chute for Spike Tooth Cylinder Type Threshers
(Clause A-1.3.3)
SI Silt of the
Prime
A
C
?
F
No. Mover for
Thresher
kW
mm
mm
mm
mm
(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 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 a (see Fig. 1) shall be
kept as under:
a) For hammer-mill and drummy-type
threshers ? 10? to 15?
b) For chaff-cutter type threshers ? 0?
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-l.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-2.1.1 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 (see IS
210) shall be used.
A-2.13 Star Wheel Shaft ? Mild steel
rod (see IS 2062) shall be used.
A-2.2 Shape
The shape of the hopper unit shall be
as shown in Fig. 2. A-13 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 The dimensions of the hopper
and star wheels when read in conjunction with Fig. 2 shall be as given in Table
5.
Table 5 Dimensions of Hopper and Star Wheel
(Clause A-2.3.3)
SI
Size of the Prime
B
C
D
E
F
G
H
(??)
No.
Mover for Thresher
Min
Min
Min
Min
? 5
kW
mm
mm
mm
mm
mm
mm
mm
deg
(1)
(2)
(3)
(4)
(3)
(6)
(7)
(8)
(9)
(10)
i)
7.J
900
180
340
75
280
45
20
50
ii)
II
900
200
370
300
280
45
20
30
Hi)
13
923
220
400
333
280
43
20
50
iv)
18.7 and above
930
240
430
363
280
45
20
50
NOTE
? Hopper feeding system is normally used with the threshers of 7.5
kW or more power ratings.
A-2.3, 4 Mounting Dimensions
A-13.4.1 The feed hopper shall be built
as an integral part of the thresher.
A-2.3.4.2 The location of the star
wheels in relation to hopper sides (see J in Fig. 2) shall be 75 mm. The centre
to centre distance 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 Pig. 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 sharp edges shall be
provided in hopper or on star wheels.
A-2.4.3 The casting shall be smooth and
shall not be porous.
A-2.5 Other types of feeding mechanisms
may also be used with feeding hoppers. A typical shape of She hopper unit wish
feed roller type feeding mechanism is shown in Fig. 3. The material and
dimensional equipment of feed relief type feeding mechanism are given in
A-2.5.1 and A-2.5.2.
A-2.S.1 MaterialThe material for the
construction of hopper, feed roilers and feed roller shaft shall be of mild
steel (see IS 2062).
A-2.5.2 Dimensions
A-2.5.2.1 The dimensions A in Fig. 2A
shall be 400 mm more than the length of the threshing cylinder and shall be
declared by the manufacturer.
A-2.5.2.2 The thickness of sheet for
hopper shall be 1.6 mm, Min.
A-2.5.2.3 The dimensions of the hopper
and feed rollers when read in conjunction with Fig. 3 shall be as given in
Table 6.
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
H
(??)
No.
Mover for Thresher,
kW
Min
Min
Min
Mm
?5
mm
mm
mm
mm
mm
mm
mm
deg
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
i)
15
740
150
545
560
300
100
15
55
ii)
26.3
900
200
560
570
300
100
15
55
iii)
37.5
925
230
570
580
300
100
15
55
NOTE
? Hopper feeding system with feed roller type feeding mechanism is normally
used with thresher of 15 kW or more power ratings.
A-2.5.2.4 The feed hopper shall be
built as an integral 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 K in 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
A-3.0 The system is used on a
chaff-cutter type thresher. It comprises a feed pressing roller, two corrugated
feed rollers and a feeding chute or conveyor 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 threshers fast
and loose pulleys to cut off the drive 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 rollers 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 less than 1.6 mm.
A-3.1.2 Conveyor ? Canvass or rubber
[see IS 1891 (Part 1)] or steel stats (see IS 2062).
A-3.1.3 Driving Roller ? Cast iron (see
IS 210).
A-3.I.4 Pressing Roller? Cast iron (see
IS 210).
A-3.1.5 Feed Hollers ? Cast iron (see
IS 210).
A-3.1.6 Tension Spring ? Spring steel
[see IS 4454 (Part 1)].
A-3.1.7 Clutch Lever? Mild steel (see
IS 2062).
A-3.1.8 Gears ? Cast iron (see IS 210).
A-3.I.9 Gear Box ? Cast iron (see IS
210) or mild steel (see IS 2062).
A-3.1.10 Gear Shaft ? 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-l.3.1 and A-l.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 of 450 mm of length of conveyor at feed inlet side
shall be covered.
FIG 4 Feed Revising Device FOR Chaff
Cutter Type Threshers
Fig. 5 Safe Feeding Chute Used on a
Chaff-cutter Type Thresher
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 reversed
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.
A-3.4.1.3 The details of gears in this
system shall be as given in Table 7.
Table 7 Details of Gears in the Feed Reversing Mechanism
SI
Type of
Gear/Designation
Shaft on which
No.
Pinion
Mounted
(1)
(2)
(3)
(4)
i)
Bevel gear
A
Splined shaft on
main shaft
ii)
do
B
Counter shaft
Hi)
Spur pinion
C
Counter shaft
iv)
Spur gear
D
Upper feed roller
shaft
v)
do
E
do
vi)
do
F
Lower feed roller
shaft
vii)
Bevel gear
0
Splined shaft on
main shaft
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
moving in 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' arc on the same shall, 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 other; 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-reversing 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 be
easy and smooth,
FIG. 7 WORKING OF FEED REVERSING
MECHANISM FOR CHAFF-CUTTER TYPE THRESHER
A-4 CONVEYOR FEEDING SYSTEM
A-4.0 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
4-4.1.1 Conveyor? Rubber [see IS
1891(Part 1).
A-4.1.2 Fenders ? Mild steel (See IS
2062).
A-4.1.3 Conveyor Holier - - Cast iron
(see IS 210).
A-4.1.4 Cover ? Mild steel sheet (see
IS 2062) having thickness of 1.6 mm. Mm.
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 of 1000 mm.
A-4.3.2 The length of covered portion
of conveyor shall be minimum of 600 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 be porous.
ANNEX A
[Clause 7.3 (b)]
REQUIREMENTS OF CONVEYOR At CONSTRUCTION
It comprises a feed pressing roller,
two corrugated feed rollers and conveyor with power transmission system. For
this type of chaff cutters with power ratings of 15 kW or more, a feed
reversing mechanism is recommended. It comprises of a gear box, a clutch lever
and two joining shafts with universal joints (see Fig, 9). In some chaff
cutters last and loose pulleys to cut-off the drive 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 feed roller is cut-off in the neutral position or
the direction of the upper and lower feed rollers is reversed.
A-2 MATERIAL
A-2. Conveyor Canvass or rubber [see IS
1891] (Part 1)] or steel slats (see IS 2062).
A-2.2 Driving Roller -Cast iron (see IS
210),
A-2.3 Pressing Roller - Cast iron (see
IS 210).
A-2.4 Feed Rollers - Cast iron (sec IS
210).
A-2.5 Tension Spring - Spring steel
[sec IS 4454 (Part 1)]
A-2.6 Clutch Lever Mild steel (see IS
2062).
A-2.7 Gears - Cast iron (see IS 210).
A-2.8 Gear Box - Cast iron (see IS 210)
or mild steel (see IS 2062)
A-2.9 Gear shaft Mild steel (see IS
2062)
A-2.10 Stand - Mild steel (see IS 2062)
A-3 DIMENSIONS The length of center-to-
center distance of conveyor rollers (see A in Fig 9) shall be minimum of 1200mm
Minimum of 450 mm of length of conveyor at feed inlet side shall be covered.
A 4 FEED REVERSING DEVICE
A-4.1 Functioning of Device (see Fig.
10)Pinion 'A' receives the drive from the main shaft of the chaff cutter 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-4.1.1 When pinion 'G' is meshed with gear
'C the direction of rotation of the upper and lower rollers is reversed. 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 cutting zone chamber.
A-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.
A-4.1.3 The details of gears in this
system shall be as given in Table 2.
Table 2 Details of Gears in the Feed Reversing Mechanism
Sl
Type of
Designation
Shaft on Which
No.
Gear/Pinion
Mounted
(1)
(2)
(3)
(4)
i)
Bevel gear
A
Splined shaft on
main shaft
ii)
Bevel gear
B
Counter shaft
iii)
Spur pinion
C
Counter shaft
iv)
Spur gear
D
Upper feed roller
shaft
v)
Spur gear
E
Upper feed roller
shaft
vi)
Spur gear
F
Lower feed roller
shaft
vii)
Bevel gear
G
Splined shaft on
main shaft
A-4.2 Functioning of Device (see Fig.
11)
A-4.2.1 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 moving in 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 or rotation of 'E' would also be the same. Gears 'E' and 'F' mounted
on upper and lower feed roller shafts, respectively, mesh with each other;
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-4.2.2 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 anticlockwise 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-4.2.3 In case the roller handle is
kept in central position, feed -reversing mechanism will not operate. This is
the neutral position.
FIG 9- FEED REVERSING
MECHANISM FOR CONVEYOR-FED CHAFF CUTTER
FIG. 10 POWER TRANSMISSION THROUGH
FEED-REVERSING SYSTEM FOR CONVEYOR-FED CHAFF CUTTER
Bottom of Form
Bottom of Form
Bottom of Form
Bottom of Form
Bottom of Form
[1]For syndicator type thresher the
dimension should be 230 mm
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