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Design and Development of Power Tiller Operated Field Mower

Dr. Md. Syedul Islam
Chief Scientific Officer and Head
Farm Machinery and Postharvest Technology Division, Bangladesh Rice Research Institute, Gazipur-1701.

Abstract/ Executive Summary:

A power tiller operated field mower was designed and fabricated in the divisional research workshop for multi purpose use of power tiller. The fabricated mower was fixed directly to the power tiller by two arms. The power from the tiller engine was transmitted to the cutting blade by three steps using belt-pulley and spur & bevel gear arrangement. The speed of the mower blade was varied from 1200 to 1500 rpm. The average field capacity and cutting efficiency of the mower was found 50 decimal/h and 97.7% respectively. This mower is suitable for grass cutting purpose.

Keywords: Power tiller, Mower, Cutting speed, Belt, Pulley, Field capacity, Cutting efficiency

Location: Gazipur

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Farm Mechanization

Commodity: Power Tiller

Objectives:

1. To use power tiller for grass cutting purpose

2.To ensure multipurpose use of power tiller

Methodology:

Existing power tiller was used as prime mover of the mower. Engineering design was done based on power tiller specification to attach in front of the tiller. M.S flat bar, M.S sheet, angle bar, shaft, bearing, pulley, nut-bolt etc was used for fabrication. RPM of the cutting blade was calculated based on the following equations: RPM of the power transmission shaft, R2 = D1 R1 /D2 .. (1) Where, D1 = Diameter of the power tiller engine pulley D2 = Diameter of the shaft pulley R1 = RPM of power tiller engine RPM of the spur gear 2, SR2 = SR1 × ST1/ ST2 .....(2) Where, SR1= RPM of the spur gear 1 (Power transmission shaft) ST1 = Number of teeth of the spur gear 1 ST2 = Number of teeth of the spur gear 2 RPM of the bevel gear 2 (cutting blade), BR2 = BR1 × BT1/ BT2 ....(3) Where, BR1= RPM of the bevel gear 1 BT1 = Number of teeth of the bevel gear 1 BT2 = Number of teeth of the bevel gear 2 SR2 = BR1 Data were collected • Field capacity (ha/h) • Cutting efficiency (%) • Height of cut (cm) • Fuel consumption (l/h) Location/Site FMPHT divisional research workshop and BRRI play ground.

Source of Information: BRRI Annual Research Review 2008-09

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

There was a facility to adjust the mower in front of the power tiller by two arms. The blade rpm was designed considering the engine rpm. Power was transmitted in three stages to the blade from engine pulley. The minimum and maximum rpm of the cutting blade was counted 1200 and 1500 during operation. During field operation, average field capacity and cutting efficiency were found 50 decimal/h and 98 percent respectively.

Knowledge Management: Report/Proceedings