DE2519328C2 - Device for the recovery of foundry sand from lumps of previously used foundry sand - Google Patents

Description

The invention relates to a device according to the preamble of claim 1.

In a device of this type known from US Pat. No. 3,793,780, the yield is in the recovery of foundry sand is unsatisfactory because, on the one hand, only part of the sand can be recovered and on the other hand the emerging sand still contains larger lumps of sand. The one from the device emerging unclassified sand has to go to a separate classification device in an expensive manner transported and classified there in a suitable manner.

The invention is based on the object of providing a device as described in the preamble of claim 1 Specify the type with which a significant proportion of the foundry sand can be recovered with a simple structure can be.

This object is achieved by the features mentioned in the characterizing part of claim 1. Preferred Features which advantageously develop the invention are contained in the subordinate claims.

The inventive design of the device, in contrast to that from US-PS 37 93 780 known device, which is primarily intended to accommodate the castings themselves and removing the foundry sand from them significantly increases the yield of reclaimed foundry sand be, as the lumps not only in the first chamber but also on the downstream sieve 31 one Casting sand-releasing treatment. As a result of the attachment of the screen and the conveyor In addition, no additional drive is required on the housing for the second treatment stage. the The oscillating movement of the chamber is used by the guide device to prevent it from passing through the sieve to derive falling grains of sand. As a result of the jam caused by the oscillating movement from the The material that has escaped from the chamber at the guide device is also circulated at this point Material that leads to an increase in the proportion of grains of sand falling through the sieve. At this Circulation also results in additional abrasion when clumps of sand are pushed against one another of grains of sand, v,; as increases the recovery rate

The invention is described below using an exemplary embodiment with reference to the drawings.

In it shows

F i g. 1 is a side view of the device; F i g. Figure 2 is an enlarged view as seen from line 2-2 of Figure 1;
F i g. 3 shows a vertical section along the line 3-3 in FIG.

A housing 10 encloses a chamber 11 which is inclined in a first region 13 from an inlet 37 has downward sloping floor 12. The inlet 37 can be closed with a door 14, which with is articulated on the housing 10 by a hinge. The bottom 12 has one of the first area 13 inclined upwardly extending second region 154 and one third and fourth areas 15ß and 15C on, which from the area 15/4 increasingly steeply directed upwards are. An outlet 16 in the form of an elongated slot is provided adjacent the top of region 15C.

/ \ n the bottom of the housing 10 are two electric motors 17 and 18 attached to output shafts 19 and 20, respectively, at the two ends 21, 22 of which each have an eccentric Weight sits.

A third electric motor 24 with an output shaft 25 is attached to the top of the housing 10, on whose An eccentric weight 26 is seated at each end.

Supports 27 are attached to the housing, which rest in a swingable manner on isolation springs 28, which in turn softens support on foundation parts 29.

Under the outlet 16, a board 30 is attached to the housing 10, which is inclined downwards and on a sieve 31 leads, which is located in a small chamber 32 attached to the right part of the housing 10. Has 31 under the sieve the chamber 32 has a bottom 33. At the end of the sieve 31, a wall 34 is attached, which serves to do so. Material.

which cannot pass through the sieve 31 to a lateral opening 35. At the end of the bottom 33 is the chamber 32 is open so that material falling on the floor 33 emerges directly from the chamber 32 can. A flexible suction pipe line 36 is attached to a vacuum source.

The device operates as follows: Lumps of sand and any material trapped therein, which originate from a mold in which a casting has been poured, are introduced into the chamber 11 through the inlet 37. Then the door 14 is closed. The electric motors 17 and 18 are switched on and set the housing 10 in an oscillating motion. The lumps in the chamber 11 rub against each other and sand in the form of individual grains is rubbed off. The sand released in this way accumulates as a mass of sand in the lower part of the chamber Π. This accumulation, together with the oscillating movement, has a transport effect according to FIG. 3 to the right has that the individual grains of sand are conveyed to the outlet 16 upwards. Since the electric motors 17 and 18 cause the housing 10 to oscillate along the direction indicated by the line A , the macrial passing through the outlet 16 is moved down the board 30 and onto the sieve 31 and continues to migrate to the right end of the sieve 31. Individual grains of sand fall through the sieve 31 onto the floor 33, which also swings back and forth and conveys sand bodies falling on it out of the housing 10 to a collecting container. Lumps of sand and other material too large to fall through sieve 31 are conveyed on to the right end of chamber 32 where they accumulate on wall 34. This has the consequence of further abrasion of the sand lumps, which previously could not pass through the sieve 31, so that the chamber 32 functions as a second recovery chamber in which further sand is recovered. Lumps which cannot be rubbed off further, trapped metal gaps, etc., are directed from the wall 34 to the side opening 35, from which they fall into a second collecting container.

Dust, for example from synthetic resin binders or clay, is removed from the chamber 32 with the aid of the suction pipe 36. After a certain operating time, material collects in the lower part of the chamber 12. for example metal parts and large, non-crushable lumps of sand. In order to remove this material from the chamber 12, either the motor 17 or 18 is switched off and the motor 24 is started. With the two motors 17, 24 or 18, 24 now running, the housing 10 is moved back and forth in the direction indicated by the double arrow B; in the process, the material located on the floor 12 is conveyed out of the inlet 37 to the left.

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For this purpose 2 sheets of drawings

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Claims (3)

Patent claims: 1. Device for the recovery of foundry sand from lumps of previously used foundry sand with a first chamber (11) which is enclosed by a swingably supported housing (10) and has an inlet (37) for introducing the lumps and the bottom (12) of which is sloping upwards running area {i5Q , at the upper end of which there is an outlet (16), and with a device (17 to 22) by which the first chamber (11) can be set in oscillating movements that lumps in it rub against one another and thereby sand grains are rubbed off from them, which collect on the bottom (12) of the first chamber (10) until the volume of the collected sand grains has become so large with continued oscillating movements that it reaches the height of the outlet (16), characterized by a Sieve (3t) _r which is attached to the housing (10) of the first chamber (11) outside the first chamber (11) for receiving grains of sand and other material emerging from the outlet (16) t, by a conveyor (33), which is arranged under the sieve (31) for receiving the grains of sand falling through the sieve (31) and on. Housing (10) is attached, and by a guide device (34), by means of which those grains of sand that do not fall through the sieve (31) due to their size, to a first area (35) and those grains of sand that due to their size through the Sieve (31) fall to a second area bitbar si'.d. 2. Device according to claim 1, characterized in that that the sieve (31) and the conveyor (33) are enclosed by a second chamber (32), and that the guide device (34) by the rviaieriaifluß is formed on the screen (31) stopping wall at one end of the screen (31). 3. Apparatus according to claim I or 2, characterized in that the device (17 to 22). through which the chamber (11) can be set in oscillating motion, is arranged and designed so that the chamber (11) oscillates back and forth on a first line (A) inclined to the horizontal, and that an arrangement (24 to 26) is provided , through which the chamber (11) for the conveyance of material located on its bottom (16) to its inlet (37) can be set in an oscillating movement along a second line (S ^ which is opposite to the horizontal line f / 4,} is inclined.