This document provides specifications for several agricultural threshing machines. It describes a paddy thresher that consists of a feeding chute, threshing cylinder, blower, and grain and straw outlets. It is made of steel and powered by a 5 hp engine. It also describes a sunflower thresher with a 65 cm diameter threshing cylinder and cleaning system. Further, it provides details on a maize dehusker-cum sheller that uses staggered pegs and sieves to separate husks from shelled maize. Charts are also included showing the effects of cylinder speed, grain moisture, and feed rate on threshing efficiency and grain loss.

1. WELCOME
1

2. PADDY THRESHER
• The thresher is consisting of feeding chute,
threshing cylinder, blower, straw outlet and grain
outlet.
• The body is made of high quality steel and sheets
to withstand maximum wear and tear.
• The feeding system is chute type and the power is
transmitted from the prime mover to threshing
cylinder though belt and pulleys.

3. Technical specifications:
• Overall dimensions (in m) : L – 1.6 , W -1.58 , Height
-1.65
• Weight - 250 kg
• Engine power requirement - 5 hp Diesel Engine or
Electric Motor
• Thresher cylinder Speed (rpm) - 510
• Cleaning system – Blower
• Feeder capacity - 900 kg /hr (789 kg / lit)

4. • Grain output - 444 kg /hr (370 kg / lit)
• Thresher efficiency (%): 96.5 - 96.8
• Cleaning efficiency (89.06%)
• Broken grain proportion (0.632%)
• Spilled grain proportion (0.283%)
• Blown grain proportion (0.395)
• Unthreshed grain proportion (1.627%).

5. Salient features:
• It can thresh paddy without chopping the straw of
the moist crop
• Low cost and high power threshing machine
• The straw, chaff, grains are separated and thrown
separately thus reducing drudgery.
• The device is easy to install and maintain.
• It does not chop the straw and hence we get it in
full length.

7. SUNFLOWER THRESHER
• It consists of a threshing cylinder, concave, casing
fitted with louvers, cleaning system, feeding hopper
and frame.
• The cylinder concave clearance is 40 mm and is
uniform throughout its length.
• The diameter of cylinder is 65 cm and length 150
cm.

8. • The opening of top sieve is 16 mm and of lower
sieve 6 mm.
• Recommended cylinder and blower speeds are
300-350 rpm and 1200-1400 rpm respectively.
• A tractor or 7.5 hp motor can operate machine.
• The machine has a capacity of 600-900 kg/h of
clean grain.
• Breakage rate: less than 0.1%
• Threshing rate: More than 99.9%

9. PAU axial flow sunflower thresher

10. Specifications:

14. MAIZE DEHUSKER-CUM SHELLER
• In this pegs are staggered at varying heights for
better shelling efficiency.
• The spikes are placed in 6 rows with 6 spikes in
each row.
• The sieves have 1.25 cm diameter opening to
separate the shelled maize from husk.

16. Specifications:
• Length(m) :-1.76
• Width (m) :-1.06
• Height (m):- 1.57
• Dia. of threshing cylinder (m):- 0.48
• Length of threshing cylinder (m):- 0.33
• Cylinder speed (m/s):- 16.4
• Type of threshing drum:- Spike tooth
• Type of blower:- Centrifugal

17. • No of sieves:- 2
• Opening size of upper sieve (mm):-12
• Opening size of lower sieve (mm):- 2
• Concave clearance (mm):- 50
• Opening size of concave (mm):-5 x 5
• Moisture content of cobs (%):- 12-28
• Threshing Capacity(kg/h):- 450-650
• Power requirement(hp/kW) :- 35/26.25

20. The thresher is divided into three main sections:
a) The feed in unit.
b) The cutting & threshing unit.
c) The grain separation chamber.
Overall Dimensions:
L – 3.9m, W – 1.09 m, H -2-3.2m
Gear Box: - Five Cylinders
Threshing Drums :– 3

21. Threshing capacity:
• Wheat – 18 to 25 quintals
• Gram – 14 to 18 quintals
• Barley – 25 to 30 quintals
• maize -18 to 22 quintals
• Soyabeen -15 to 20 quintals
• Groundnut – 20 to 22 quintals
• Corn – 8 to 10 quintals.

22. • Average threshing efficiency:-99.60%,
• cleaning efficiency:-99.07 %
• Grain damage:-0.25%,
• Grain blown:-0.36%,
• spilled grain:-0.30 %
• Total loss :- 0.91%

28. Effect of grain moisture and cylinder speed on threshing efficiency, cleaning
efficiency and grain loss (a: Grain moisture 13.5 %, b: Grain moisture 16 %.)

29. Effect of grain moisture and feed rate on threshing efficiency, cleaning
efficiency and grain loss (a: Grain moisture 13.5%, b: Grain moisture 16 %.)