Claims
- 1. 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.
- 2. A method as claimed in claim 1 wherein the batches of sand and binder and sand and catalyst supplied to the mixing chamber by separate feed units each employing a rotary feed element.
- 3. A method as claimed in claim 2 wherein the weight of each batch is controlled by operating the feed elements for a controlled number of revolutions.
- 4. A method as claimed in claim 3 wherein the weight of a mould or core is controlled by controlling the number of batches and weight per batch.
- 5. 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.
- 6. Apparatus as claimed in claim 5 including a pair of rotary element feed units for supplying the sand and binder mixture on the one hand and the sand and catalyst mixture on the other hand to the mixing chamber.
- 7. Apparatus as claimed in claim 6 wherein the means for controlling the weight of each batch comprises means for operating the rotary elements for a controlled number of revolutions.
- 8. Apparatus as claimed in claim 7 wherein the mixing chamber includes a rotary mechanical mixing element.
- 9. Apparatus as claimed in claim 8 wherein the mixing element has a first pair of blades adapted to sweep the roof and an inner vertical cylindrical wall of the chamber and a second pair of blades angularly offset from the first pair and adapted to sweep the base of the chamber respectively.
- 10. Apparatus as claimed in claim 9 wherein the mixing chamber has an inlet in the roof and an outlet in the base aligned with or offset from the inlet.
Priority Claims (1)
Number |
Date |
Country |
Kind |
33003/72 |
Jul 1972 |
UK |
|
Parent Case Info
This is a continuation of application Ser. No. 376,431 filed July 5, 1973, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (3)
Number |
Date |
Country |
1,051,651 |
Dec 1966 |
UK |
1,286,162 |
Aug 1972 |
UK |
2,055,274 |
May 1971 |
DT |
Continuations (1)
|
Number |
Date |
Country |
Parent |
376431 |
Jul 1973 |
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