US3700106A

US3700106A - Comminutor

Info

Publication number: US3700106A
Application number: US87455A
Authority: US
Inventors: Paul Wittke
Original assignee: Condux Werk Herbert A Merges KG
Current assignee: Condux Werk Herbert A Merges KG
Priority date: 1969-11-11
Filing date: 1970-11-06
Publication date: 1972-10-24
Anticipated expiration: 1989-10-24
Also published as: DE1956607A1; CA933136A

Abstract

A comminutor for coarse materials and to be installed in sewage channels has a rotatably mounted sieve drum having a plurality of sieve rings arranged in spaced relationship thereon. A comminutor element is mounted on a respective one of each of the sieve rings. At least one support column is provided and has a comb unit thereon arranged to cooperate with the comminutor element on the sieve drum. A ring member is fastened to the lower end of the sieve drum for rotation therewith and has a blade carrier member to which is attached a blade member. A fixedly mounted counterring having a blade member is arranged so that its blade member cooperates with the blade member of the ring member to provide a scissor-like comminuting action.

Description

United States Patent Wittke Oct. 24, 1972 [54] COMMINUTOR [72] Inventor: Paul Wittke, Niederrodenbach, Germany [22] Filed: Nov. 6, 1970 [21] Appl. No.: 87,455

[30] Foreign Application Priority Data Nov. 11, 1969 Germany ..P 19 56 607.5

[52] US. Cl ..210/174, 210/357 [51] Int. Cl. ..B01d 35/28 [58] Field of Search ....210/173, 174, 357; 241/4606 [56] References Cited UNITED STATES PATENTS 1,948,125 2/1934 Nordell ..210/174 X 2,761,627 9/1956 Reed ..24l/46.06

2,336,06912/1943 Chase ...2 1 /1 7 4 Primary Examiner-Samih N. Zaharna Assistant Examin erF. F. Calvetti Attorney-Spencer & Kaye [57] ABSTRACT A comminutor for coarse materials and to be installed in sewage channels has a rotatably mounted sieve drum having a plurality of sieve rings arranged in spaced relationship thereon. A comminutor element is mounted on a respective one of each of the sieve rings. At least one support column is provided and has a comb unit thereon arranged to cooperate with the comminutor element on the sieve drum. A ring member is fastened to the lower end of the sieve drum for rotation therewith and has a blade carrier member to which is attached a blade member. A fixedly mounted counterring having a blade member is arranged so that its blade member cooperates with the blade member of the ring member to provide a scissor-like comminuting action.

4 Claims, 4 Drawing Figures PATENTEunm 24 I972 3.700.106

SHEET 1 or 2 I Fig. I

Inventor:

Poul Wifike ATTORNEYS.

PATENTED UBT 24 I972 SHEET 2 [1F 2 In vemor: Poul Wifike ATTORNEYS.

COMMINUTOR BACKGROUND OF THE INVENTION The present invention relates to a comminutor for coarse materials to be installed in sewage channels. It includes a rotating sieve drum with horizontally extending sieve rings which are disposed in a spaced relation with one another, and having comminutor elements connected thereto, as well as at least one stationary comb fastened to a respective support column.

Several embodiments of comminutors for coarse materials of the above-mentioned type are known. They all have in common that teeth connected to sieve rings pass through gaps between individual comb teeth, whereby floating materials carried along by the sewage are comminuted. To accomplish this, floating materials are first washed by the sewage waters onto a jacket surface of a sieve drum and, while the water flows away through the slits disposed between the individual sieve rings, the coarse materials are carried along by the sieve drum to the comb unit where they are comminuted in the described manner. When the floating materials, which are conventionally called coarse materials, have been sufficiently comminuted, they are washed away by the sewage water-and no longer may impede the flow in the canal system.

Lately, these coarse materials have come to contain substantial quantities of thermoplastic synthetics in the form of, for example, foils and woven materials.

Whereas it used to be relatively simple to comminute these coarse materials, the presently relatively high proportions of synthetic components in the coarse materials place increased requirements on the known comminutors. These increased requirements cannot be met by all the comminutors of the above-mentioned type and older models especially may have to be replaced; all of which would be rather expensive.

A particular disadvantage of these older machines, which were designed for coarse materials containing substantially lower quantities of synthetic materials than are now encountered, is that threads from textile shreds or strips from packing material remnants are not sufficiently torn apart by the comminutor elements. Such uncomminuted materials cause the known, and very annoying, strand formation to occur. The strand formation, in turn, leads to substantial malfunctions in a sewage system or in a purification plant, as the case may be.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the known comminutors of the above-mentioned type in such a manner that their comminution output, i.e., cutting efficiency, is adequate for the present-day coarse material substances referred to above.

This is accomplished according to the present invention by providing a comminutor for coarse materials of the above mentioned type which has a releasably fastened ring designed to be mounted on the underside of the sieve drum. A blade carrier passes through this ring and mounts at least one blade which cooperates with the blades of a stationary counterring.

With a comminutor constructed in the manner described above, the coarse material components which formerly were insufficiently comminuted in the area of the comb section and which penetrated into the interior of the sieve drum to be carried away with the sewage stream are subjected to a further scissor-like comminution before they leave the sieve drum. This scissor-type comminution reduces the coarse components to dimensions which will not longer cause malfunctions in the process equipment.

BRIEF DESCRIPTION OF THE DRAWINGS DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a plurality of sieve rings 1 arranged in a spacedrelationship on the periphery and along the axis of a rotatably mounted sieve drum 2. The arrows in FIGS. 1 and 4 show a possible direction of rotation. A comminutor element 18 is-mounted on a respective one of the sieve rings 1. A support column 13 is provided for mounting a comb unit 12. Comb unit 12 is arranged to cooperate with the comminutor elements 18. An arrangement similar to that described thus far is shown in more detail in Application Ser. No. 877,631, filed Nov. 18, 1969, now US. Pat. No. 3,584,743, in the name of Herbert Dinges and commonly owned with this application.

It is to be understood that more than one column 13 and corresponding comb unit 12 may be used if desired, although only one set is shown in the drawings. Any number of additional sets of columns 13 and corresponding comb units 12 will be spaced around the periphery of the drum 2.

A ring 3 is fastened to the lower rim of the bottommost of the rings 1 (FIGS. 1 and 3) of the sieve drum 2 in a known manner, such as by screw fasteners. Ring 3 has a blade carrier member 4 arranged diametrically through it, as can best be seen in FIG. 1. Carrier 4 and ring 3 are preferably made in one piece in a known manner, such as by casting. A blade member 5, which preferably is dimensioned to extend over the entire length of the blade carrier 4, is fastened to the carrier 4 in a known manner, such as by screw fasteners.

A counterring 6 is shown in FIG. 2 and is also provided with a blade carrier 7. The carrier 7 is preferably constructed as a unitary portion of counterring 6 and is provided with a blade member 8. Counterring 6 is provided in its upper region with an abutment surface 9 (FIG. 2) which is fitted into a base ring 10 (FIG. 3) formed in the bottom of the comminutor housing 17 (FIG. 3). A base ring such as ring 10 is always present in a comminutor of the type referred to herein. A column or columns are fastened to the base ring 10 to provide increased stability to the lower region of the machine where the cutting forces are greatest.

The abutment surface 9 is equipped with at least one claw 11 three being shown in FIG. 2. Claw 11 is designed to be supported on a respective one of the columns 13 there being a column 13 for each claw l1 so that counterring 6 is fixedly mounted against rotation.

As can be clearly seen from FIG. 3, claw 11 is advantageously provided with a screw jack having a bolt 14 and a nut 15. Nut 15 is supported by an abutment surface 16 provided on the upper surface of the base ring 10, so that it is possible to adjust the height of the counterring 6 by turning the bolt 14 and the nut 15 relative to one another. It should be understood that such a height adjustment normally requires at least two such setting devices (only one of which is shown); that is, two screws 14 and nuts 15 in respective claws 11, or the like.

This adjustment of the counterring 6 permits the stationary blade 8 to be set for the desired scissors-like cutting, or comminuting, action obtained by its cooperation with the rotating blade (FIG. 4). It has been found advisable to set the two

blades

5 and 8 close enough together that their cutting surfaces come in light contact with one another, in the manner of a pair of scissors. This has the advantage that the blades will tend to automatically sharpen one another, and makes it only necessary during operation to'adjust the setting of the blade from time to time. This arrangement has the further advantage that the

blades

5 and 8 need be only removed from the device when they have worn down sufficiently that they must be replaced.

All of the elements referred to above are constructed from suitable, known materials.

Thus, the arrangement of the present invention provides a solution to the problem of synthetic materials in sewage which permits known comminutors to be easily modified to include the ring 3 and the counterring 6 and to permit present machines to be continued in use.

It will be understood that the above description of the present invention is susceptible to various modifications changes and adaptations, and the same are intended to be comprehended within the meaning and range of equivalents of the appended claims.

I claim:

1. A comminutor for coarse materials and to be installed in sewage channels, comprising, in combination:

a. a rotatably mounted sieve drum defining an axis and formed by a plurality of sieve rings arranged in spaced relationship along the drum axis, said drum defining a flow area normal to said axis; comminutor elements mounted on said sieve rings;

. at least one support column;

. a comb unit mounted on said support column and arranged to cooperate with said comminutor elements;

e. a ring member fastened to the lower end of said drum for rotation therewith and having a blade carrier member to which is attached a blade member having a linear cutting edge extending along the entire diameter within said ring. member with its cutting edge disposed transversely to said drum axis; and

f. a counterring fixedly mounted against rotation and having a blade carrier member to which is attached a blade member having a linear cutting edge extending along the entire diameter within said counterring with its cutting edge disposed transversely to said drum axis, said blade members being arranged in order to engage their cutting edges in a scissors-like manner to provide a comminuting action, said blade carrier members and their respective blades constituting the only structural elements in said flow area, whereby the channel flow is not substantially affected.

2. A comminutor as defined in claim 1, wherein said counterring is provided with at least one claw which is rigidly attached to said at least one column so as to fixedly mount said counterring.

3. A comminutor as defined in claim 2, further including adjustment means associated with said at least one claw for axially displacing said counterring.

4. A comminutor as defined in claim 3, wherein said adjustment means includes a screw jack having a bolt and nut.

Claims

1. A comminutor for coarse materials and to be installed in sewage channels, comprising, in combination: a. a rotatably mounted sieve drum defining an axis and formed by a plurality of sieve rings arranged in spaced relationship along the drum axis, said drum defining a flow area normal to said axis; b. comminutor elements mounted on said sieve rings; c. at least one support column; d. a comb unit mounted on said support column and arranged to cooperate with said comminutor elements; e. a ring member fastened to the lower end of said drum for rotation therewith and having a blade carrier member to which is attached a blade member having a linear cutting edge extending along the entire diameter within said ring member with its cutting edge disposed transversely to said drum axis; and f. a counterring fixedly mounted against rotation and having a blade carrier member to which is attached a blade member having a linear cutting edge extending along the entire diameter within said counterring with its cutting edge disposed transversely to said drum axis, said blade members being arranged in order to engage their cutting edges in a scissorslike manner to provide a comminuting action, said blade carrier members and their respective blades constituting the only structural elements in said flow area, whereby the channel flow is not substantially affected.