AAGM Aalener Gießereimaschinen GmbH
Wöhr Gießereianlagen | Projektierung – Anlagenbau – Service
Reclamation of cold-resin-bonded moulding sands up to 50 t/h
We plan, design, and manufacture latest reclamation technology for cold-resin-bonded moulding sands. Our reclamation plants are designed such that at least 96 per cent of the reclaimed sand can be reused, thus creating an almost entirely closed environmentally friendly system.
Wöhr reclamation plants are equipped with a Siemens Simatic S7 control and operate fully automatically from the shaking-out of the mould to the storage of the reclaimed sand.
They are characterized particularly by their robust design, performance, durability, economic efficiency, state-of-the-art technology, and environmental friendliness.
Environmentally conscious foundry technology
The entire system is noise- and dust-encapsulated and supplies a constant sand temperature, which plays an important role for the subsequent processing and considerably reduces the binder consumption.
Due to the extremely gentle treatment of the sand, our reclamation plants prevent damage to the sand grain.
The reclamation plants are available in versions with a capacity of up to 50 t/h and designed such that optimal results are achieved at the various hourly outputs. The plants are planned based on the existing conditions and requirements and adapted optimally to achieve best possible economic efficiency.
Shake-out grids are used to unpack the drained moulding box. A stable grid is vibrated with the help of strong motors so that the sand falls off the cast part.
The entire structure is bedded on rubber buffers which absorb a great deal of the dynamic forces from the substructure. It is important here to dimension the shake-out grid correctly so that sensitive cast parts are not damaged but the entire sand falls off the workpiece.
Through the grid the sand gets onto a vibrating conveyor which transports it to the vibration crusher.
Vibration crusher / lump grinder
In most cases, the sand still contains lumps of various sizes.
These are crushed in the vibration crusher.
The sand passes several screening stages and is transported back to the feeding level of the vibration crusher by means of vibration conveying. This reduces the overall height of the plant considerably and creates space advantages.
Foreign material in the sand that cannot be classified is removed from the system through an automatic discharge flap at the back of the crusher.
Magnetic separator / ventilift / separating screen
A magnetic separator is installed before the ventilift to remove the iron particles contained in the sand.
The sand falls onto a permanent magnetic drum and all magnetic parts are separated mechanically from the sand. Permanent magnetic drums are low-maintenance, reliable, and energy-saving.
With the ventilift, the sand is fluidised by feeding in an air stream, and is conveyed vertically into the intermediate bunker. In that process, additional reclamation effects arise such as cooling and dedusting of the sand.
Via the intermediate bunker with the dosing slide located below it and the separating screen, the sand reaches the fluid bed cooling separator.
Fluid bed cooling separator
In the fluid bed cooling separator, the sand is fluidised in a continuous
process by means of a bottom-up air stream. The thus pressurised sand becomes capable of flowing and flows in the direction of the outlet through the heat exchangers installed in serpentines. Due to the fluidisation, the sand is in close contact with the cooling pipes so that heat is extracted from it very effectively.
The constant outlet temperature of the reclaim is determined by the flow rate control of the sand and the cooling water temperature.
The fluidisation also brings about very good dedusting of the sand. Another advantage is the low construction height of the plant.
It is optionally possible to equip the fluid bed cooling separator with an automatic discharge screw for heavy fractions such as chromite sand, ceramic parts etc.
Cooling water system
We provide various systems for the generation of the required amount of cooling water. For the economically favourable open cooling circuits we provide low-maintenance, closed cooling systems with water-to-air heat exchangers. To cover the peak loads during the summer months, cooling compressors are used. Alternatively, existing well water can be used via heat exchangers. The cooling water is inserted directly in the last cooling stage with the help of the electrical control to achieve maximum energy efficiency.
We provide flexible solutions the design of which considers the customer- and climate-related requirements. By applying state-of-the-art measuring systems, the use of energy for re-cooling of the sand is continuously analysed and optimised.
After grinding, cooling, and cleaning, the sand is transported pneumatically into storage silos and is available for the production circuit again.
Depending on the customer's case of application and tasks, we provide various pressure vessel conveying systems. This covers the range from conveyors for hot materials (200°C) to highly-efficient continuous conveyors for bulk material.
If required, new sand can be inserted in the reclaim for refreshment. An almost entirely closed environmentally friendly circuit has been created.
- State-of-the-art components
- High cooling capacity, constant sand outlet temperature
- Best sand quality due to gentle treatment of the sand
- Separation from all foreign materials
- At least 96 per cent of the sand can be reused
- Low noise load due to noise-encapsulated system
- Low energy costs
- Fully automatic plant, visualised
- Individual customization to your requirements