Solid material comminution or disintegration – Apparatus – With automatic control
Patent
1996-04-25
1998-07-28
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
With automatic control
241 82, 2412571, 2412611, B02C 2500
Patent
active
057852618
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for reducing the size of steel or metal chips generated by metal-cutting operations, the device having a receiving hopper and connected thereto a tapered milling hopper with tearing units arranged around its circumference, and with a tearing blade and triangular blades mounted on a rotating cutter head which pass by the tearing edges of the tearing units, and a milling unit under the milling hopper.
The long chips generated during metal-cutting operations become intertwined to form large tangles or clumps. The tangles or clumps are fed to the device to be reduced in size and for the cutting oil to be removed by centrifugation.
2. Prior Art
Known devices such as those described in DE G 89 01 794.3 or DE 42 19 080, as well as in U.S. Pat. No. 4,988,045 and EP-A-418,856, do not fully meet this requirement. They still require too long to process the chips and total reduction of all the clumps of chips is often not achieved. After coarse reduction of the chips is carried out, the material is fed to a milling unit having a milling disc equipped with milling grooves. Better size reduction of the clumps of chips is achieved in this way and the processing time is also shortened. There is less risk of clogging occurring, but it is not entirely eliminated.
There is another problem which is not solved, by some of the known devices, namely the problem caused by the occurrence of large, solid pieces of tramp metal in the flow of chips; such lumps of tramp metal are often not caught even by separating devices positioned in the area of the metal-cutting machines. A device for ejecting such pieces of material is described in the above-mentioned U.S. Pat. No. 4,988,045. In that device, an opening in the wall of the milling hopper can be opened and closed by means of a powered channel slide to provide an opening through which large pieces of tramp metal can be ejected.
Given these circumstances, the underlying purpose of the present invention is to prevent damage to the known device by providing an automatically functioning, operationally safe device for ejecting tramp metal, while retaining the already achieved advantages of preventing the flow of material within the device from being disrupted by clogging.
In a device of the type referred to herein, these advantages are obtained by: hopper, but above the mouth of the chip discharge chute. This ejection channel is openable or closable by means of a powered slide, and when the ejection channel is in the open position the slide exposes a downward-oriented outlet provided in the channel, to which is attached a tramp metal ejection chute leading outwardly at an angle, milling discs arranged one on top of the other, whose annular inner surfaces surround the rotating shearing head which has shearing blades arranged around its circumference, with the inside surfaces equipped with shearing grooves arranged at a certain distance from each other.
If there is a large piece of tramp metal mixed in with the chips which, in the first processing stage, are to be reduced in size and broken up between the tearing units with their tearing edges, the tearing blade and the triangular blades, then this piece of metal will be located in the lower part of the milling hopper where it will be rotated by the cutting head together with the chip material. This causes clumping and compaction and the rotation of the cutting head is slowed or in some cases even totally jammed. This can be prevented by opening up an ejection channel in the lower section of the milling hopper by retracting a slide which normally closes off the channel during normal operation. The large item of material which has been recognized as a foreign body is pushed out of the milling hopper through this channel by the rotation of the cutter head. When the ejection opening is exposed by retracting the channel slide, it opens into a downward--oriented outlet through which the large piece of material is guided downwards by the ejection chut
REFERENCES:
patent: 1941770 (1934-01-01), Welsford et al.
patent: 4988045 (1991-01-01), Griesedieck et al.
patent: 4998045 (1991-03-01), Ruby
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