The Construction Of Sieve Equipment

Project and Seminar Material for Chemical Engineering

The Construction Of Sieve Equipment


Abstract


The sets of seizes with shocker which was fabricated and assembled in the chemical engineering pilot plant was aimed at providing the students with a machine that will aid them in practical involving the separation of solid particles. Besides this, it was also fabricated sizes or diameter of the solid particles of a substance by allowing it pass through the pores or aperture of the sieve plates.

The process of operation involved the following: marking out of the sieve plate using dimension of 135mm and the shaker basing with dimension 2.4mm on the corrugated iron sheet using a scriber and a steel rule; punching of the market out line using hammer and chisel, cutting of the punched path of the sieve using guillotine, but in the case of the sieve mesh a Shearer was used in the cutting; folding of the corrugated iron using folding machine; drilling of the four holes using drilling machine, welding of the sieve plate and the handles using oxyacetylure flame; filling of the holes on the welded edges with a c-per body filler; smoothening of the sieve plate using sandpaper and lastly the painting and sun drying of the sieve plate using an oil paint.

The shaker base with the dimensions 2.4mm by 1.8mm was fabricated to house the motor, which comprised of a rotor, stator and coil and a capacitor of 2700 coulomb.

In the end, all the parts were assembled and a sieve equipment of commendable and a sieve equipment of commendable efficiency was fabricated with the specified dimensions mentioned above and a regulator.


Chapter One


Introduction

Sieve equipment is a kind of machine fabricated to be used in separating solid particles. Naturally, its mode of separation is similar to slow sand filtration; and this is a term used in unit operation, but sieving is a piece of unit operation is carried out.

The sieving equipment works by allowing solid particles of different sizes to pass through the pores or the aperture, which consists of orderly, arranged sets of sieves in a manner of the particle sizes and shapes.

Sieve equipments are of different types and sizes, the type though is not a determinant of the motion, but the size is a major determinant. The major of the types are the commercial and industrial types of sieves with shocker, and are usually constructed in big form. The minor of the types however is the small-scale sieve, which is often constructed, in small form. Most of these three types are electrified, and carries time and regulator. Their movement is either in zig-zag, or ‘up and down’ (vertical) motions, but latest research verified that the movement could be in both ‘up and down’ and zigzag combined, although it is a lot more costly.

These equipments for solid particles size analysis are mostly used in the separation of solid particles in the pharmaceutical industries, gold refinery as well as in diamond companies; and because of its use in these industries and factories, the equipment is not been commonly.

The sieves were fabricated in such a way as to allow particles of different size, to pass through the mesh or pores of the sieve plates after a short period of time. Basically, sieve equipments consist of a set of sieves preferably with the quality of shocker in accordance with its speed range. The speed of the sieve shoker motor ranges from 0.1000 2.pm (revolution per minute), 0-1200 r.p.m, 0-1500 r.p.m upwards to 2600 r.p.m and are normally used in advanced factories and industries.

The sieve equipment operates best when the solid particles is in their coarse and fine form. The equipment has high sensitive efficiency, but only few have been constructed since the development of separation of particles. This is as a result of the losses incurred and the procedures involved, and also the labour needed to clean the sieve plate and to handle the sieve equipment.

The sieve shocker on the other hand is a device used to shake or vibrate a stacked colume of standard sieves and test trays to cause solid particles to sift progressively from the top (with large openings) to the button (with small openings) and a receiver (pan). The sizes of the mesh are in descending order of 17.5mm and 7.3mm, 3.0mm, 2.0mm, 1.5mm, 0.04mm and 0.08mm.

The shaker is an electrical device which consist of an electric motor with capacity 1.5 r.p.m (revolution per minute) which does the vibration and causes the shaking of the sieves; a capacitor of 2700 which stores the current; the sieve on/oft switch; a spindle was placed off centered in the motor to enable the vibration in a zig-zag direction.

The sieve shaker is the most important part of the sieve equipment because without the shaker, there will be no vibration at all.


Chapter Five


Conclusion and Recommendation

The ordinary method of separating solid particles is by a sieve equipment machine. This consists of a set of sieve and an electric shaker. Sieve with shakers are of different diameter of mesh or aperture decreasing from the ed on the top to the bottom, so the quantity of solid particles used at the initial stage during experiments cannot be the same that will be obtained at the last stage because the large particles do cause blinding of the mesh.

The sieve equipment is mainly used for the separation of solid particles through a mesh, which retains most as overflow, but once the particle passes through the mesh, they fall into the other plate and passes on to the next plate until all the solid particles are separated.

The sieve shaker is an important part of the sieve equipment. It soes the shaking which enables the particles to be separated into different shapes and sizes. The vibration of the shaker occurs in zig-zag movement due to the fact that the spindle of the electric motor was cut of centered on the top plate. Its efficiency depends on the size of the electric motor.

The sieves with shake for solid particle analysis is far better than the ordinary hand sieve and sieves cost because it separates the particles according to their sizes and shapes. The sieve equipment can be used for large pharmaceutical, diamond, gold, mining garri, and flour null industries to mention but a few.

After the fabrication, the sets of sieves was tested and seen to be of working efficiency.


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