Experimented tumbling machine
During rotation oysters swirling around the drum and faster the process, more cleaning observed
Rubber mat studded inside the barrel
Improved tumbling machine
Inside the rotating drum, center bar covered with rubber lining ensuring safety of mature oysters
Before cleaning the oysters
After cleaning of oysters
After a combined experiment of National Aquatic Resources Research and Development Agency (NARA), SLCDF and community members, has come up with an oyster tumbling machine which is highly efficient low cost hand tool for women oyster farmers in Kalpitiyia area.
Oyster tumbling machine is mainly used to grade and produce quality oysters on a weekly basis.
On an experimental level initially a machine was introduced to Praja Sanwardhana Sanvidhanaya Kandakuliya that was equipped with nylon brushes and steel wool brushes. Cleaning mechanism was performed according to the rotating speed and cleaning power of attached brushes. It was manually operated and for easy operation a rotating power gear was included. Water should be poured with buckets (nearly 20L) and oysters loaded from either side of drum. It has the capacity to accommodate nearly 40-50 mature oysters in one cycle. Drain tap was attached to the side for dirty water removal. When testing the machine a few areas for improvement was observed.
In the improved version of the tumbling machine the inside of the drum and the centre bar are lined with rubber mats which increase cleaning mechanism and protect oyster shells from any physical damage ensuring more safety of mature oysters. Mats having holes help sieve dirt on oysters drained to the tank with soiled water.
The time previously spent on cleaning the oysters has been reduced by hours for the oyster farming women with the introduction of this handy machine. They see it as user friendly perfectly working machine that has given them extra time for family and other needs.
This project has been funded by Stichting Gilles of Belgium and implemented with technical assistance from NARA. Similar machines would be provided to the two other community based organizations working under this project in Kalpitiya lagoon area.