Projeto e fabricação de máquina separadora de moedas

Coin sorting machine design and manufacturing

Counting coins is a tedious task when coin collections are large. Say for example in banks, temples, bus stations, shops etc. they are spending a lot of time and effort to count their collections. Typically, the method they adopt is to first separate the coins of each denomination and then count the total in each denomination. Finally, the totals for each denomination are added together to obtain the grand total. From this we can understand that separating into denominations is tedious work. Therefore, it will be very helpful to them if a device can be used to separate coins into denominations. It will be relatively easier to attach provisions for automatic counting once the coins are separated.

coin separator mechanical design coin separator mechanical design

CURRENCIES AND THEIR PARAMETERS

The following four parameters were considered for coin classification:
Diameter/distance
Thickness
Weight
Magnetic property

Diameter/distance
If the shape of the coin is circular, then its own diameter is the parameter. But not all coins are circular in shape, so in case of coins that are not circular in shape, 'distance' is considered as a parameter. The term distance refers to the corner-to-corner distance or flat-to-flat distance. For example, as shown in figure 1 for a square shaped 5 paise coin, 'd1' is the corner to corner distance while 'd' is the flat to flat distance. The distance parameter for 10 paise, 20 paise and 100 paise coins is shown in the figure.

Thickness
For most, the edge is thicker than the inner surface. The maximum coin thicknesses were measured using a caliper with a minimum count of 0.01 mm and the values ​​noted in table 1.

Weight

Coin weight is also an important parameter in coin grading. Therefore, the weight of each coin was determined using an electronic scale with readability down to 0.01gmf. The coins were placed one by one on the plate and the corresponding weights were obtained by optical reading and the values ​​were noted in table 1.

Magnetic property
If coins of one denomination are magnetic while coins of another denomination are non-magnetic, these two denominations can be easily separated using this parameter.
In each denomination, 10 coins were taken at random and in each coin the measurement of its magnetic property was made in more than one place and it was noted in table 1 whether the coins were magnetic or non-magnetic.

Application of coin parameters for coin separation.

Solution using Diameter/Distance
In this method, a circular model with several holes, in order of increasing diameter in a counterclockwise direction, is kept stationary. A thin circular plate, called a rotating arm, has holes to accommodate a coin of maximum diameter.


The dimensions of the rotating arm must be designed so that only one coin can be loaded into each of the holes in the arm. When the coin passes through the corresponding hole, it falls through that hole.

We will start the project and we will post the progress.

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