DHB Pass-Through Monorail Machine type D

Technology:

Wheelblast

Application:

Cleaning, Shot Peening, Corrosion Removal, Surface Texturing

Industry:

Light/ Medium

Process:

In-line

Latest transport technology

Highly efficient blast wheels

Short blast times

Multiple machine sizes and variations

Characteristics

Latest transport technology
Highly efficient blast wheels
Multiple machine sizes and variations

Applications

Removal of moulding sand
Removal of mill and forge scale as well as rust
Removal of burrs and scales
Increase of surface roughness
Shot peening to increase fatigue strength

Short Blast Times

The Wheelabrator pass-through monorail type D shot blast machines (closed loop operation) achieve short blasting times due to the combination of the latest transport technology and highly efficient blast wheels.
Workpiece changeover is carried out semi-automatically or automatically by the Power & Free system. The closed loop blast machine is provided with a rotating device on the monorail which rotates the loaded workpiece carriers in front of the turbines. This means that blast wheels need only be installed on one side of the blast cabin which lowers maintenance and energy expenses.

The abrasive is pre-accelerated very efficiently by the TITAN blast wheels, which allows for short treatment times and reduced abrasive consumption when compared to conventional blast wheels.

An extensive range of machine sizes, wheel power and optional equipment is available due to the modular construction methods employed by Wheelabrator. The most suitable machine can be engineered to fit your specific requirement, application, investment and operational costs.

Process speeds and production capacities can be increased further with the modular addition of infeed and outfeed sluices, in accordance with your requirements.

The Process

The workpieces are carried on rotating hooks on the manually-operated monorail or conveyed automatically on a (optional) Power & Free conveyor to the blast cabinet where they are blasted by blast wheels. The blast cycle runs in accordance with the preset blast time. When the blast wheels stop, the door is opened and the hook exits automatically.

Manually Operated Monorail

The workpiece transport devices (hooks) are pushed by hand to the shot blast machine. They are automatically drawn into the blast chamber. Optionally, an automatic or manual door closure is available.
The loading/unloading of the transport devices can be performed manually at all positions outside the shot blast machine. The manually operated monorail is preferably used for small workpiece quantities with low weights.

Special Features and Options

Standard machine: Used abrasive and fines fall through the abrasive collection hopper beneath the blast cabinet, and are transported via a screw conveyor to a bucket elevator, and to the Abrasive reclamation unit.

In the unit, used abrasive passes through a sieve tray which catches any uncommonly large fines, to the Abrasive silo/Airwash separator which cleans the abrasive for reuse.

Option for Medium Applications

For improved abrasive cleansing, e.g. separation of aluminium flashes, a vibro sieve can be installed between the reclamation unit and abrasive silo.

Option for Foundry/Heavy/Sand Applications

A Vibro conveyor can replace the screw conveyor, this provides an initial cleansing/separating of sand and heavy contaminants from the used abrasive. The conveyor would ideally be installed with the optional Magnetic separator to remove sand in order to prolong the life of the machine. The abrasive then goes to the Airwash separator as before.

Power & Free Conveyor

Power & Free conveyors are characterised by two rails lying on top of each other: a drawing chain runs in the upper rail, the transport device is suspended in the lower rail. The Power & Free conveyor provides high flexibility in the linking of different production processes.

Due to its robustness, the Power & Free conveyor used by Wheelabrator is especially suitable for applications with particular strains like high dust content and high temperatures.

In operation, the Power & Free system can automate the transport process of the pass-through monorail shot blast machine, and connect it to the superior production control – for example, by integrating the blast machine between a die cutter and a crack detector. In isolated systems, the operator starts a preselected number of transport devices to be automatically processed.

TITAN blast wheel

The blast wheel is the heart of a blasting machine, as the choice of blast wheel determines the power output and the economics. This machine is fitted with TITAN as standard, which offers excellent blasting performance and unbeatable service life for the main blast components, which are made from hardened tool steel.

The TITAN offers even more wall strength through its wear lining, which creates an airtight and completely insulated housing as well as easing maintenance and repairs. There is a full range of variations and sizes available to ensure the chosen wheel is specific to the job in hand.

Go to the TITAN detail page

Abrasive Removal

During the blast process, dust, broken abrasive and other solid particles or contaminants (fines) are generated by the rust and scale removed from the workpieces. The fines are separated in the abrasive reclamation unit which is individually adjustable to the different types and sizes of abrasive.
The Abrasive reclamation unit consists of an impact separator and a cartridge filter. The impact separator removes the fines from the abrasive and serves as a certified spark extinguisher and meets all ATEX regulations.
The cartridge filter provides the necessary negative pressure to remove dust. lt can be installed separately beside the shot blast machine. The filter is automatically cleansed by compressed air pulses which are adjustable in intensity and duration. All elements of the filter unit are free from ignition sources.
Alternatively, wet filter units can be used for the necessary dust removal. This is often applied in aluminium die casting.

Vibro Conveyor

In place of the standard screw conveyor, a vibro conveyor can be used to transport abrasive from the blast cabinet to the bucket elevator. The sieve installed in the vibro conveyor separates coarse fines from the abrasive. For dust removal, the conveyor is linked to the dust filter of the central machine.

Vibro Sieve

For a blast process without interruption, a vibro sieve is used to clean abrasive.
The vibro sieve is used after the abrasive reclamation unit and sieves coarse particles, such as flashes from aluminium diecasting workpieces, from the abrasive so that they do not affect the blast process.
The sieve is installed above the silo. It is driven by two vibro-motors and set in motion similar to a shaker sieve. A targeted sieving of unwanted fines is achieved with the mesh size adapted to the process. Fines are automatically fed into a bin via a downhose.
Lateral flaps allow easy access to the sieve for ease and maintenance.

Magnetic Separator

The magnetic separator increases your profitability by reducing machine wear and reducing abrasive consumption.
Moulding and core sand on castings is removed during the blast process. As they cause high abrasion they must be separated from the ferro-magnetic abrasive quickly and efficiently. This is performed in the magnetic separator.
Two rollers with adjustable magnetic fields and a sieving box separate the moulding and core sand and fines from the reusable abrasive, in this way only 0.2% of the weight remains. This reduces wear and abrasive consumption and leads to higher profitability for you.

Original OEM parts

We provide high quality, long lasting replacement parts. As the largest distributor of replacement parts in the industry we can deliver globally in the shortest timescales to prevent you having to have a large inventory stock on site or breaks in production.

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