products offers coconut dehusking machine products. About 56% of these are fruit & vegetable processing machines, 10% are shellers. This coconut dehusking machine peels off the coconut husk to obtain a dehusked coconut via mechanically controlled dehusking devices. Considering the drawbacks of manual dehusking methods, and existing automated dehusker, power operated coconut dehusking machine was developed.

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SujaykumarShashidhar B. AsantapurVishwas C. Coconut is a main crop of konkan region and dehusking of coconut is very necessary step in making the coconut ready for further utilization.

Coconut dehusking involves removing of the husk from the coconut. Traditional dehusking is time consuming and difficult process. To overcome these limitations, to improve the automation and to provide safety for the operator, a new design of dehusking machine is introduced and fabricated. This dehusker comprises usage of two horizontal rollers with series of sharp tools which would shear the husk from coconut when rolling against each other.

Shear force is required for dehusking of mature green coconut and dry brown coconut. Shear force required is more for mature green coconut than dry coconut. Torque and speed reduction required for dehusking is calculated by using the force required for shearing coconut. Optimum number of spikes is arranged on the rollers to dehusk the coconut with minimum force. Shear force, Optimization of force, Design of rollers, Force analysis.

Introduction Kerala, which has one of the largest coconut growing area. Need for the improvement in present method is the lack of sufficient manpower. This necessitates the use of appropriate machinery to aid in various tasks in coconut plantation [3].

Coconut Dehusking Machine Manufacturers and Supplier in India

Traditional devices currently in use, such as the blade and spear are dangerous and minimally productive. Based on this realization, a machine is fabricated that simplifies an important process as well as increases the productivity of the coconut industry. This new mechanism will indirectly boost any economy that relies on coconut plantations [4]. The machine includes a base or a frame positioned on a support surface.

Two rollers have spiked tool separated by a small distance, substantially parallel relation with each other. A drive is directly engaged to rollers. Interconnection forces it to rotate in opposite directions. Roller rotates in a direction towards centre, shearing the husk from coconut [5].

This machiine is useful to the coconut estates and co-operatives, coconut growers and coconut processing factory. The machine can provide faster work rate and less human interaction. This machine is expected to increase the coconut dehusking rate.

It does not require direct human force as in normal methods because in this the spiked rollers which are rotating are made to enhance the force at the head of the coconut to put pressure for dehusking.

Also, coconut mwchine any size and shape can be dehusked easily. It is easy to xehusker, does not need skilled labour, rapid, safe operation and simple maintenance. It can be easily assembled and disassembled and is portable. The cost of this machine is lesser as compared to the present available machines.

Also, these available machines require external electrical power supply. Advantages are to remove the husk effectively and easily, to increase productivity, to reduce manual power, to reduce risks and accidents, to reduce labour cost and time consumption [6].

This coconut dehusking machine peels off the coconut husk to obtain a dehusked coconut via mechanically controlled dehusking devices called as spiked rollers. To transmit the power from motor to cylindrical rollers gear and chain and sprocket transmission system shall be incorporated. The dehusking unit is consisting of cylindrical rollers attached with tynes cutting pins over the surface.


The coconut is placed in the intermediate distance between rolling cylinders.

The rollers will rotate in such a way that there will mzchine tearing of coconut fiber from the shell.

With dehuskrr meshing of fiber with tynes effective dehusking is achieved while consuming lesser time. The shape and size of coconut is considered while designing the machine. The rollers are interconnected each other by means of a spur gear arrangement. The rollers are kept apart with a centre distance depending on the average diameter of coconut shell, so that the coconut shell should not pass in between the rollers.

The motor used is of 1hp geared motor of rpm which rotates shaft at 70 rpm. The whole set up is mounted on a rigid frame made of mild steel. Methodology The coconut dehusker base assembly is fabricated using milling, grinding, and welding operations. Collecting Data The dimensions of the mature coconut are very much significant as far as the machine design is concerned.

Various farms and sites were visited to comprehend the band of dimensions involved ,achine the mature coconut. Some coconuts from Andaman and Nicobar Islands are larger in size when compared to the areas thrived with coconuts in India like Tamil Nadu and Kerala. The machine has been designed to overcome a large range of coconut sizes, with equal importance to productivity. Various places in and around Tamil Nadu and Kerala have been considered predominately to arrive dehuskeer a conclusion on the size of coconuts.

The dimensions have been measured denusker an external caliper.

coconut dehusking machine

Majority of coconuts appear to have the dimensions such that the Y and Z direction dimensions are almost identical. However, the critical and concerning dimension for this machine design is the dimension X.

Coconut dimensions Dry coconut with ovoid shape with length of mm, Diameter of mm, Weight of 0. Testing The husk is removed from the Machine through the shear force exerted by the fixed toothed rollers in the machine. SoShear force required to dehusk the different coconuts like raw, moderately dry, dry and completely dry coconut has been determined. The mechanical properties of the coconut fiber are studied from the works. Graph between X-direction dimensions of the mature coconut and shear load to de-husk the coconut Figure 3.

Graph between X-direction dimensions of the dry coconut and shear load to de-husk the coconut It is evident from the above graph that the load required for de-husking the dry coconut is higher than the load required for de-husking the mature coconut. Also, graphs are plotted for both dry and mature coconuts in such a way that X-Dimension of the coconut is taken as an independent parameter in X-axis and the shear load is taken along the Y-axis.

This is due to the fact that the shear load varies based on the size of the coconut. Design of Dehusker The dimensions of cylinders are designed in a manner to obtain effective mesh with coconut husk.

Dimensions of spike on Roller The adhesion between fibers in the husk is greater than that between the shell and the husk; hence separation occurs at the husk-shell interface. The thickness of fiber is in the range of 20 to 40mm.

The dimension of tynes should be so selected that to get effective penetration with coconut. The tynes can be attached to cylindrical rollers either by welding or by using fasteners. Spike Dimension Both horizontal and circular pitch has to be designed. Horizontal pitch is the distance between tynes along the axis or length of cylinder.


Circular pitch is the distance between tynes about the periphery of cylindrical roller.

For selecting the horizontal pitch the average length of coconut is to be considered. It is found to be mm. The tynes are mounted on cylinder in such a way that optimum number of tynes should be in contact with the coconut.

Coconut Dehusking Machine, Capacity: Nuts/ Hr, Rs /unit | ID:

This will help in reducing the load on each tynes and increase efficiency of dehusking operation. For selecting circular pitch average width of coconut is found to be mm.

Suitable number of tynes should be selected to have good mesh and effective dehusking. The power from electric motor is transmitted to the rotating cylinders through pulleys and gears. Power should have less speed and high torque at the rotating cylinders and this is obtained by using a speed reduction gearbox.

The gears and pulleys will be arranged in dehusket a way that desired output is obtained by making use of readily available sizes of gears and pulleys, so as to keep the manufacturing cost low.

Force Analysis Figure 5. Forces acting while Dehusking Manually applied load cocoonut self-weight of the coconut will be acting at the point of contact on the two rollers.

Shearing force will act between the husk and the coconut.

The resultant of these two forces will act on the rotating roller while dehusking. The method of Shear force evaluation is considered for the bearing force calculation. The following Nomenclatures are used in all the bearing calculations presented. H1 and H2 are the loads acting on the bearing in the Horizontal plane. V1 and V2 are the loads acting on the bearing in the vertical plane.

Pr is the radial load due to gear, Pt is the tangential load due to gear, G is the self-weight of the gear, S is Self-weight of the roller. Forces acting on the roller in the Horizontal plane Taking Moment about vertical plane, 1 Taking Moment about horizontal plane, 2 Equation 1 and equation 2 are used to calculate the load acting in horizontal H1 and vertical plane V1.

The coconut dehusking machine prepared is operated by mechanical system. This system exerts the force ten times more than the force applied in the manual method. With reference to some papers, it has been observed that the force applied to dehusk the coconut by manual methods is less than the machine. The frame is the main supporting structure upon which the other components are mounted on.

The frame is a welded structure constructed from 50mmx50mmx5mm angle iron with dimensions mm in length, mm width and The unit comprises of 2 rollers, 2 roller shafts and 2 sprockets. Each roller shaft is a mild steel rod of 40mm diameter, with length mm supported at both ends by ball bearings. And the parts are painted to prevent from rusting. Shaft Diameter is 35mm, Tolerance of K6, Static load carrying capacity of N, Dynamic load carrying capacity of N, Maximum permissible of rpm.

Gears with 54 and 70 teeth are used. Selection of above specifications are done on average diameter of the coconut and forces acting in vertical and horizontal plane.