Solid material comminution or disintegration – Apparatus – With separation or classification of material
Patent
1985-06-27
1987-01-20
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
With separation or classification of material
241 14, 241284, 241DIG10, B02C 1912
Patent
active
046375589
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention deals with a decoring apparatus for castings operating by means of vibration.
The known apparatus has a centrally arranged vibrator rigidly fastened to the frame, and from said vibrator, two vibratory pipes laterally project from each side, said pipes being each positioned in the center area of their longitudinal length, in a rigidly supported partition wall and lead from there to a casting clamping device. This device is rigidly retained at each of its upper and lower sides via a rubber bellows and provided, at each of the two facing front sides, with tension elements for a casting, whereby at the front sides, further rigidly supported rubber bellows on both sides of the vibratory pipes are provided, against which the casting tension device acts via an air gap. This device is expensively designed and expensive to manufacture. Furthermore, due to the clamping of the castings by the tension elements, which is difficult to automate, much time is wasted. Moreover, the rubber bellows provided at the upper and lower sides of the casting tension device are constantly subjected to impact or sudden compressive stress and tensile load by the vibration induced into them, which shortens their life span considerably. In addition, the horizontally arranged rubber bellows are constantly stressed by impact. The life span of the rubber bellows, in addition, is reduced by the natural aging of the rubber.
The object of this invention therefore is to design a device of the previously-mentioned type which does not have any parts yielding to extreme wear, which also is comparatively simply designed and where, above all, the respective casting can quickly and without problems be positioned without using any tension elements.
Due to the freely movable support arrangement of the carrying unit in the support frame together with the simultaneously loose positioning of the casting in the carrying unit and its displacement between the two facing stops within a defined clearance, the casting is induced to natural vibration by which the sand cores contained therein are disintegrated to sand and thus are destroyed by the vibrations induced into the carrying unit and directed in its displacement direction.
A slanted positioning of the carrying unit with a rear side support surface for the casting formed by individual support ribs, has the advantage that the loosened core sand can flow out of the casting by itself. The loose insertion and removal of the casting into or from the carrying unit respectively can not only be accomplished manually quickly, conveniently, and almost without any danger, but also can advantageously be done in an uncomplicated manner by a robot.
When the carrying unit is suspended in the support frame via swinging arms with commercially conventional rubber-metal supports or bearings, essentially no wear takes place at the supports. Furthermore, the friction in the supports (bearings) is small and, therefore, the efficiency is at an optimum.
The shape of the receiving opening provided in the carrying unit can be individually adjusted to any casting. By means of exchangeable buffer bars or an impact plate, respectively, in the receiving opening, castings of varying size can be placed in the same carrying unit.
A vibrator equipped with a frequency converter has the advantage that the necessary vibration frequency can be specifically adjusted to the number, size, and hardness of the sand core respectively in the casting, and therefore can be reliably disintegrated. For cores of usual size and hardness, however, vibrations of about 3000 vibrations/min. are induced into the carrying units by the vibrators. Mounting the vibrators directly on the carrying unit prevents wear, because transmission elements or the like are advantageously unnecessary.
In order to reduce the emitted operating noise of the apparatus, an easily detachable hood can be built around it, which has, on its inner wall, a noise-absorbing or silencing material.
The weight of the carrying unit is desirably to be a multiple greate
REFERENCES:
patent: 4296794 (1981-10-01), Leliaert
Wheelabrator Resomatic, Wheelabrator-Frye Inc., bulletin No. 130,00.
Jenzsch Gunter
Rauh Kurt
Wegscheider Hans J.
Mirbeth Rudolph
Rosenbaum Mark
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