\\ Industrial Shredders
Multi-Purpose Shredding Plants
IntroductionThis range of turn-key plants are used for processing municipal, vegetation and builder's waste. The unique feature of these plants is the combined use of two feeding mechanisms. A horizontal conveyor and driven overhead roller ensures positive feed to the shredder. Also included is a discharge conveyor to stockpile the shredded material.
Controlled by a Programmed Logic Controller(PLC) this range of machinery requires minimal operator involvement.
The following information applies to Models MPS-130/40 through to MPS-550/150
The basic plant consists of:
1) Infeed Hopper - with moving floor or conveyor 2) Shredder 4) Feed Roller 5) Control Cabinet Plus Options
Also on this page Performance on different products |
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Infeed Hopper
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In all cases, the infeed hopper fixes to the shredder and is fabricated from AS250 steel plate. The loading side is lower than the rear side to assist in preventing product falling behind the machine, whilst keeping the loading height to a safe minimum. The end of the hopper is normally in the form of a door and has micro-switch protection so that if the door is opened whilst the machine is operating, the whole plant will shut down.
The door is provided to allow unshreddables to be ejected by reversing the feeder. |
A) For machines MPS 200/60 and greater
The floor of these is a moving floor or apron feeder, and is manufactured using close fitting plates approximately 150mm wide connected to long link chain sections.
The close fitting plates minimise the amount of material falling through the feeder onto the floor or ground underneath and therefore not requiring constant cleaning. Machinery using open type feeders do have this problem.
At intervals, cleats are welded to the plates to give additional traction to the feed. The feeder is driven by a motor gearbox combination driving through a chain drive to the head pulley sprocket.
Hardened steel wear blocks on the underside of the plates are in contact with alloy steel wear strips to give support to the plates.
This conveyor is based on the This conveyor is based on the Brentwood Apron Feeder conveying system.
(B) For Machines - MPS-130/40 and Smaller
In this case, the hopper is constructed the same as for the larger machines but has a conveyor belt as the feeder. The steel feeder as described in (A) for machines MPS-200/60 and greater is available as an option for this machine.
Shredder
All Brentwood Shredders use a twin counter-rotating shaft design principal. Shaft rotation is approximately 25 rpm.
The product to be shredded and the volume of production required are key factors relating to Shredder selection.
The actual shape, number of hooks, thickness and configuration of cutters are all factors to be considered for a particular application. Interactive consultancy with the Brentwood engineering team ensures correct application of the machinery.
The production rate and size of feedstock decides the power requirement.
Brentwood Shredders are unique in design providing overload "BACK OFF". If during the normal operation of your plant the shredder encounters foreign material which overloads the shredder motor, the shredder will stop, reverse, stop, then start forward again. Facility is provided to preset the number of reversals allowable prior to shutdown and/or alarm, or if desired no limit can be placed on reversals. This system helps to protect the shredder from damage. In many instances the shredder will, after a couple of reversals, shred the material then carry on with the rest.
If the shredder shuts down, the feeder can be reversed and foreign material can be dumped out the back of the feeder.
It should also be noted that when the shredder reverses, the feeder will stop till the shredder current has dropped to a normal level, then starts forward again.
Cutters used in these machines are manufactured from case-hardened alloy steel.
Day to day maintenance is extremely low compared to high speed hammermills. The ultimate life of cutters is dependent upon the product being handled. The time between major overhauls usually exceeds 4000 hours but is dependant on the material being processed and other local factors. Simple maintenance of cutters is a matter of hardfacing and hand grinding in the machine. It is not uncommon to reach periods of 6 - 12 months before this is necessary.
Feed Roller
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In conjunction with the moving floor the feed roller provides a positive feed to the shredder.
This is a device placed above the moving floor, pivoted to obtain its own height setting automatically and positioned just before the shredder.
On some products, this is necessary to maintain continuity of product to the shredder. The feed roller is driven by an electric motor/gearbox combination attached directly to the shaft of the roller. Overload protection is provided. |
Outfeed Conveyor
This is usually a cleated conveyor belt emerging from under the Shredder, and reaching an elevation of approximately 3m. If the optional refiner is fitted then the discharge conveyor is located on the outfeed of the refiner.
The height of the outfeed is variable from 1.5m to 2.7m by fitting the conveyor on a horizontal pivot.
The following optional equipment has been developed to further enhance the operation of your plant.
Options
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The life of the
hammers in the mill are extended greatly in this situation
as the shredder does the initial breakdown of the product
and the mill purely REFINES the product as it free falls to
the mill.
Refiners are available in 55 kW, 75 kW or 110 kW and are controlled by the plant PLC. |
(B) Magnetic Separation
This is available as a magnetic head drum located on the outfeed conveyor.
(C) Screening
Many forms of screening are available. The range covers grizzly screens, vibrating screens or trommel screens.
(D) Mobile Plants
Multipurpose Shredding Plants and Shreddermills are available as mobile plants supplied as trailer or skid mounted.
Performance
| Details | MPS 200/50HD | MPS 200/60 | MPS 240/100 | MPS 550/150 |
| Municipal Household Waste - t/hr | 7-9 | 10-12 | 15-17 | 25-30 |
| Tyres - Car & Light Truck - no/hr | 250-300 | 300-400 | 800-1000 | 1200-1300 |
| Tyres - Truck (debeaded) - no/hr | N/A | N/A | 100-150 | 200-300 |
| Wood Pallets (Mix of Pine & Hardwood) - no/hr | 45 (pine only) | 60 | 200 | 200 |
| White Goods - up to - t/hr, m3/hr | N/A 2-3 | 3, 4-5 | 10, 4-5 | 15 |
| Aluminium Cans - t/hr | 1.5-2 | 2-3 | 4-5 | 4-5 |
| Trees & Garden Waste - input - cub m/hr | 80 | 150 | 250 | 300 |
| Eucalyptus Bark - t/hr | 4 | 6 | 10 | 12 |
| Waste Timber - upto t/hr | 2-3 | 5-10 | 10-15 | 15-20 |
Drawings |
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MPS (Multipurpose Shredding Plants) |
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