Method and apparatus for preparing foundry moulds or cores
AssigneeBaker Perkins Holdings Limited
InventorAlbert Edwards
Life of this patent
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Abstract
A method and apparatus for preparing relatively large size foundry moulds and cores from cold-setting foundry sand mixtures wherein successive batches of sand and binder on the one hand with sand and catalyst on the other hand are mixed in a chamber having a rotary mixing element. The batches are discharged from the chamber by gravity into a mould or core box and the chamber is purged by a blast of compressed gas between the successive mixing operations.
Claims10
A method of preparing a foundry mould or core from a cold-setting foundry sand mixture comprising the steps of
- a. feeding a batch of sand and binder mixture in a first feed unit to a mixing chamber.
- b. simultaneously feeding a batch of sand and catalyst mixture in a second feed unit to the mixing chamber.
- c. mixing the batch of sand and binder mixture with the batch of sand and catalyst mixture in the mixing chamber,
- d. discharging the mixed batches from the mixing chamber into a mould or core box under gravity,
- e. purging the mixing chamber with compressed gas,
- f. repeating steps (a) through (e) until a predetermined number of mixed batches are discharged into the mould or core box.
Apparatus for preparing a foundry mould or core from a cold-setting foundry sand mixture comprising a first feed unit for a batch of sand and binder mixture, a second feed unit for a batch of sand and catalyst mixture, a mixing chamber, means for simultaneously feeding said batch of sand and binder mixture and said batch of sand and catalyst mixture to said mixing chamber, a mould or core box, outlet means in the mixing chamber for discharging the mixed batches into said mould or core box by gravity, means for supplying a blast of compressed gas to the mixing chamber for purging the chamber between successive mixing operations and control means for controlling the number of batches and weight of each batch supplied to the mixing chamber.
Dependencies are inferred from the claim text.