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Development of a Manually Operated Oyster Shell Crusher

A. T. M. Ziauddin
Probssor
Depertment of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

S. C. Das
Postgraduate strdent
Depertment of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

A manually operated oyster shell crusher was fabricated and evaluated. The crusher consists of two knurling rollers, two gears, two bush bearings, two adjustment bolts, one handle, one hopper and a tray. When the crushing rollers was powered by hand through a handle, the oyster shell as received through the hopper was crushed by the rotating rollers. The performance tests indicated that the device could crush 17.80, 7.51, 3.76 kg/hr in lst phase of reduction, 2nd phase of reduction and 3rd phase of reduction, respectively. The average efficiency of the device was found to be 97%. The crusher can be used for crushinq of oyster shell, snails etc. with high satisfaction.

Keywords: Crusher, Gear and bearing, Calcium, Poultry feed, Oyster shell crusher

Location: Bangladesh Agricultural University, Mymensingh

Start Date:

End Date:

Program Area: Farm Mechanization

Commodity: Crusher

Objectives:

(a) To develop an oyster shell crusher for poultry feed.

(b) To test and evaluated the performances of the device.

Methodology:

Experiences indicated that five revolutions of the roller in 15 seconds could give better performance of crusher under consideration. The average size of the oyster available is 0.0762 m. The oyster shell need to be reduced from 0.0762 m size to 0.00254 m for easy consumption of the poultry (BAU, 1905). With appropriate value of the coefficient, C, the Cick's law (Hendersen and Peny, 1980) may be applicable for crushing the shell. The value of C has been assumed to be 10 for oyster shell. Most of the parts of the crusher were fabricated and tested h the workshop of the Department of Farm Power and Machinery of Bangladesh Agricultural University, Mymensingh. lt consists of an oyster hopper, two knurling shafts, gear, bush bearings, supporting plates, a handle, attachments rods, and a tray. Two knurling shafts of the same dimension were fabricated. They well supported on two vertically placed plates. One shell was & living and the other was driven. The driven shaft was fixed and driving shaft was adjustable. The decrease between the shaft could be increased or decreased with two adjustable screws. The range of clearance was zero to 3 mm. Both the shafts were connected with two gears of equal size. Men the driving gear was rotated with a handle, the power was transmitted to the driven shaft. Both the shafts were rotated in opposite direction and the oyster shell were feed between the shafts. There was a hopper above the shafts and it had a tray to receive the crushed oyster shell. Laboratory tests were conducted to determine the fineness modules, c+arty of the crusher,proper requirement, efficiency of the crusher and the feeding performance of the crusher. Fineness Modulus of the crushed material was to test the capacity of the crusher, five samples of oyster shell, each of 25 g were taken. Shafts were rotated by means of a handle and oyster shells were feed between the shafts. The crushed material and time were recorded to determine the capacity of the crusher. Arm length of the handle was measured and spring balance was set in the driving shafts. During the rotation of the shafts, revolutions, time in second and force in kg were removed. Six groups of equal number of ducks and hens from the poultry farm of Bangladesh Agricultural University, Mymensingh were taken for the test. Each group consists of three numbers of poultry. According to the feed rate of poultry farm, 7.5 kg of oyster shell were mixed with 100 kg of feed. The mixture were supplied to each group of duck and hen. After 30 minutes, the unconsumed crushed shells were measured and feed intake efficiency was calculated.determined by the standard sieve analysis technique and the shaking machine.

Source of Information: J. Agril. Mach. & Mech.3 (1 & 2), 1996 : 117 - 121, ISSN 1024 -6291

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The oyster shell crusher is suitable for operation by a single person. It is quite capable of crushing the shell to various sizes, and to perform multiple functions such as crushing of oyster shell, crushing of snail and grinding of fertilizer. The costs of the crusher is within the reach of small and medium farmers.

Knowledge Management: Journal