Small Size Stone Crushers
Feb
There are different types of small crushers in various states with a production capacity ranging from 3 to 25 TPH. Typically, the units having only one Jaw type crusher used as primary or secondary crusher along with one or maximum 2 screens are grouped as small stone crushers. A few most representative types of small crushers are described below.
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Crushers with completely manual breaking/feeding/ retrieving/stocking operation with single jaw and single rotary screen
In these types of small stone crushers, the mined raw stones are transported to the crusher site by trailors or truck and unloaded & stocked at ground level near the crusher. Big boulders are manually broken one by one to about 8-10 inch size. Typically a team of about 15-20 workers does breaking throughout the day. The coloured stones are manually sorted and separately stocked, this is done to avoid mixing of different coloured stones in the crushed products, else it may fetch less price. The broken stones are manually carried on head load to feed in the Jaw Crusher.About 10-15 workmen are engaged for the purpose. The crushed stones are discharged through a chute in to a rotary screen. The screened products of various sizes are discharged on the ground below the rotary screen and the products are manually retrieved and taken to stock piles. These type of crushers typically operate with crushing capacity in the range of about 2-5 TPH. Such crushers are highly labour intensive and about 50 to 60 persons are involved in the operations such as breaking, feeding, retrieving and stocking. These crushers claim to produce stones of good quality due to manual sorting, uniform breaking etc and lesser quantity of fines.
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Crushers with manual breaking manual/gravity feeding belt conveyors single jaw & rotary screen type
In some crushers the rotary screens are installed at elevated position and the screened products are separately collected and transported via belt conveyors to stock piles. The dust product smaller than 6 mm size is stored mostly in closed
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Comprehensive Industry Document on Stone Crushers
silos. Such crushers typically operate with crushing capacity range of about 5 – 15 TPH.
The above two types of small crushers are mostly found in the state of Orissa, Bihar, West Bengal, North Eastern States, Himachal Pradesh & Tamil Nadu, Andhra Pradesh.
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Mechanical/Gravity feeding, single jaw with vibratory type screens with belt conveyors
In these type of crushers the mined raw stones are transported to site by trailors/trucks and are unloaded in an elevated stone well. The stones are retrieved from the stone well through a chute at the bottom side end and the stones are fed by gravity in to the primary jaw crusher. The crushed stones are conveyed to rotary/vibratory type screens by belt conveyor. The oversize from the screen is returned either to the stone well or directly in to the crusher for further size reduction. These type of crusher generally have production capacity in the range of 15-25 TPH.
These types of crushers are widely found in almost all the states & the most common type of crusher set up.
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Single Jaw Bucket Elevator, Elevated vibratory screen with storage bunkers type compact units
In some crushers the crushed stones from the jaw crusher are raised to a high elevation with the help of bucket elevators which discharges the material in vibratory screens and screened products are directly discharged in various storage hoppers. The Products are directly loaded in to trucks standing below the storage hopper. There are no belt conveyors in the units.
These type of crusher are generally found in the States of Maharastra & MP etc.
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