Studies on tractor mounted paddy reaper

Abstract

A tractor front mounted 2.2 m paddy reaper-windrower was jot fabricated from Punjab. Medications were carried out to suit to Kerala conditions. Power is drawn from the PTO shaft of the tractor through the intermediate shaft to the auxiliary gearbox of the reaper. From the gearbox power is transmitted to cutterbar and conveying assemblies. The reaper assembly is connected to the hydraulic link of the tractor through wire ropes and ‘A’ frames for lifting and lowering of the reaper. The crop is cut by the reciprocating knife and is conveyed through crop row dividers, starwheels pressure springs and lugged conveyor belts and is discharged as a neat windrow. The weight distribution of tractor with and without the reaper on all the four wheels were studied. It was found that in addition to the weight of the reaper at the front axle, a weight of 85 kg is transferred from the rear axle to the front axle when the reaper is mounted at the front of the tractor. The weight of the reaper is equally shared by the left and right wheels without effecting the stability. The idle power requirement of the cutterbar, conveyor belts, universal joints, intermediate shaft and the total power requirement are found to be 0.625 hp, 2.595 hp, 0.09 hp, 0.185 hp and 3.495 hp respectively. The cost of the reaper is Rs.20,000. the average field capacity is found to be 0.37 ha/hr. The circuitous pattern of harvesting is found economical compared to the reverse pattern. The preharvest loss, sickle loss, uncut loss, shattering loss and total cutterbar loss were found to be 0.004 per cent, 0.87 per cent, 2.2 per cent and 2.28 per cent respectively. Manual harvesting costs Rs.1625/ha whereas reaper needs only Rs. 400/ha having a saving of Rs.1225/ha in addition to timeliness of work and saving in manual labour upto 186 man-h/ha. It is established that the tractor front mounted paddy reaper-windrower is an appropriate agricultural machine which suites technically and economically to Kerala conditions and helps to reduce the cost of cultivation of paddy and is recommended for popularization.