US3704782A

US3704782A - Unit body vibrating screen with distortion free bearing assemblies

Info

Publication number: US3704782A
Application number: US67832A
Authority: US
Inventors: Mathew P Hahn
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1970-08-28
Filing date: 1970-08-28
Publication date: 1972-12-05
Anticipated expiration: 1989-12-05

Abstract

A vibrating screen is disclosed of unit body construction having a cylindrical vibrator housing welded on each end to vertical side walls of a screen body, to utilize the vibrator housing as a unitary part of the screen body. Bearing housing assemblies fitted to journal ends of a vibrator shaft in the housing, are provided with a collar connected to outer surfaces of the side walls around apertures defined therein in register with the cylindrical vibrator housing. Back bearing housing is provided with a cylindrical portion projecting along the central axis of the collar, inward of the adjacent side wall and into the adjacent end of the cylindrical vibrator housing to extend bearing support of the vibrator shaft to within the space between the side walls of the screen body. The cylindrical portion of the bearing housing is spaced radially inward of the vibrator housing along the entire axial length of the cylindrical portion of the bearing housing to provide a clearance around the entire circumference of the cylindrical portion of the bearing housing and isolate the cylindrical portion of the bearing housing from distortion of the vibrator housing.

Description

United States Patent Hahn [54] UNIT BODY VIBRATING SCREEN WITH DISTORTION FREE BEARING ASSEMBLIES [72] Inventor: Mathew P. Hahn, Wauwatosa, Wis.

[73] Assignee: Allis-Chalmers Manufacturing Company, Milwaukee, Wis.

22 Filed: Aug. 28, 1970 21 Appl. No.: 67,832

[52] A US. Cl ..209/326, 209/366.5 [51] Int. Cl. ..B07b 1/28 [58]. Field of Search ........209/366.5, 326, 332, 367

[56] References Cited UNITED STATES PATENTS 2,660,067 11/1953 Glover ..209/3665 [451 Dec. 5, 1972 Primary Examiner-Tim R. Miles Att0rneyArthur M. Streich, Robert B. Benson and John P. Hines [57] ABSTRACT I A vibrating screen is disclosed of unit body construction having a cylindrical vibrator housing welded on each end to vertical side walls of a screen body, to utilize the vibrator housing as a unitary part of the screen body. Bearing housing assemblies fitted to journal ends of a vibrator shaft in the housing, are provided with a collar connected to outer surfaces of the side walls around apertures defined therein in register with the cylindrical vibrator housing. Back bearing housing is provided with a cylindrical portion projecting along the central axis of the collar, inward of the adjacent side wall and into the adjacent end of the cylindrical vibrator housing to extend bearing support of the vibrator shaft to within the space between the side walls of the screen body. The cylindrical portion of the bearing housing is spaced radially inward of the vibrator housing along the entire axial length of the cylindrical portion of the bearing housing to provide a clearance around the entire circumference of the cylindrical portion of the bearing housing and isolate the cylindrical portion of the bearing housing from distortion of the vibrator housing.

1 Claim, 2 Drawing Figures UNIT BODY VIBRATING SCREEN WITH DISTORTION FREE BEARING ASSEMBLIES CROSS REFERENCE TO RELATED PATENT APPLICATION This application discloses an invention applied to a vibrating screen which is also the subject of my copending United States patent application entitled Unit Body Vibrating Screen, Ser. No. 67,831 filed concurl rently with this application.

BACKGROUND OF THE INVENTION No. 2,313,765 of 1943; US. Pat. No. 2,702,634 of 1955; and US. Pat. No.'2,75l,080 of 1956. Each of these patents disclose such a screen in which a massive drive shaft is journaled in bearing assemblies which are in turn journaled in a housing around the drive shaft with at least part of an axially extending external cylindrical surface of the bearing assemblies fitted to an axially extending internal cylindrical surface of the housing. The housing, the bearing assemblies or both are connected to side walls of the screen body and with any such arrangements the drive shaft, the bearing assemblies and the housing, are carried by the screen body. When such an assembly is connected to the side walls by, for example, a circular array of bolts, considerable care is required to avoid uneven tightening of the bolts which is one potential cause of distortion of the inner circumference of the housing and deformation of the bore of the bearing assemblies which can lead to premature bearing failure.

SUMMARY OF THE PRESENT INVENTION It is an object of the present invention to provide a new and improved vibratory screen having a drive shaft, drive shaft bearings and a drive shaft housing, with the drive shaft carrying bearing assemblies isolated from distortion of the drive shaft housing.

It is another object of the present invention to provide a'vibratory screen of new and improved unit body construction having a high degree of strength coupled with economical construction and ease of assembly.

According to a preferred embodiment of the present invention for achieving such objects, a vibrating screen is provided with a cylindrical vibrator housing projecting on each of its ends into apertures defined in adjacent vertical side walls of the screen body, with the vibrator housing welded to the side walls to be a unitary part of a screen body of great strength which carries therein a drive shaft and bearings. Bearing housing assemblies fitted to journal ends of the drive vibrator shaft in the housing, are provided with a collar connected to outer surfaces of the side walls around the apertures defined therein, in register with the cylindrical vibrator housing. Each bearing housing is provided with a cylindrical portion projecting along the central axis of the collar inward of the adjacent side wall and into the adjacent end of the cylindrical vibrator housing to extend bearing support of the vibrator shaft to within the space between the side walls of the screen body. The cylindrical portion of the bearing housing is spaced radially inward of the vibrator housing along-its entire axial length to provide a clearance around the entire 0 circumference of the cylindrical portion of the bearing housing to isolate the cylindrical portion of the bearing housing from distortion of the vibrator housing.

Other features and objects of the invention that have been attained will appear from the more detailed description to follow with reference to an embodiment of the present invention shown in the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. I of the accompanying drawing shows aside elevation of a vibratory screen according to the present invention; and

FIG. 2 is a fragmentary view partly in section taken along line lIII in FIG. 1' and viewing the structure in the direction indicated by arrows.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1 a vibrating screen is shown having a screen body 10 supported by springs 11 which are mounted on stationary support structures. The upper ends of springs 11 are connected to the screen body 10 and the screen body is supported at an incline to a horizontal plane placing a feed end 12 at a higher level than a discharge end 13. A vibrator drive shaft 14 is carried by the screen body 10 midway between the feed and discharge ends l2, 13. The drive shaft 14 is driven by a motor 15 through belts 16 connected to drive a pulley 17 mounted on one end of drive shaft 14. The screen body 10 is shown as being provided with two decks or screen surfaces 18.

Referring to FIG. 2 it is shown that the screen body 10 comprises a pair of horizontally spaced

vertical side walls

20 and 21 having inner surfaces 22, 23 facing toward each other and outer surfaces 24, 25 facing away from each other. Each side wall includes an annular ring 26, 27 defining

apertures

28, 29. The

apertures

28, 29 are aligned in horizontal and vertical register. A cylindrical vibrator housing 30 is provided having an end portion projecting into each of the

apertures

28, 29 and a midportion spanning the space between the

side walls

20, 21. The ends of the vibrator housing 30 are connected to

side walls

20, 21 by

welds

32, 33 connect,- ing the outer circumference of the vibrator housing 30 to the inner surfaces 22, 23 of the

adjacent side walls

20, 21; and by

welds

34, 35 connecting the inner circumference of the aperture defining rings 26, 27 to adjacent ends of the vibrator housing 30. The vibrator drive shaft 14 is arranged within the cylindrical vibrator housing 30. The drive shaft 14 may be constructed as disclosed in US. Pat. No. 2,292,327, with

journals

36, 37 which are concentric to the vibrator housing 30. Bearing housing assemblies 40, 41 are mounted on the

journals

36, 37 and are connected to the screen

body side walls

20, 21. Each of the bearing assemblies 40, 41 is provided with an annular collar 44 having a vertical surface 45 engaging an outer surface 24, 25 of

side walls

20, 21. A plurality of bolts 46 are spaced around the collar 44 and connect the collar to the

adjacent side wall

20, 21 in register with the annular rings 26, 27. Each of the bearing assemblies 40, 41 is also provided with a cylindrical portion 48 projecting parallelto' an axis XX' central of the collars 44, inward of an adjacent of the

side walls

20, 21 and into an adjacent end of the cylindrical vibrator housing 30. Bearings 50 are carried within the cylindrical portions 48 and the bearings 50 carry the

journals

36, 37 of shaft 14. The axially inward projection of the cylindrical portions 48 supports the bearings 50 inward of

walls

20, 21 thereby extending support for shaft 14 to within the space between the

side walls

20, 21 of thescreen body 10. The cylindrical portion 48 of each bearing assembly 40, 41 is spaced radially inward of the vibrator housing 30 along the entire axial length of the cylindrical portions 48 and provides a clearance 52 around the entire circumference of the cylindrical portion 48 of each bean ing assembly.

The shaft 14 projects on both ends axially outward of the bearing assemblies 40,41, to provide shaft end portions 54. The end portions 54 have a central axis Y--Y' which is eccentric to the central axis XX' through the bearing assemblies 40, 41. A wheel 55 is mounted on eachof the end portions54 and the pulley 17 is concentrically attached to one of the wheels 55. Eccentric mass is built into shaft 14 and/or attached to wheels 55 as weights S6 to locate a center of counterbalancing mass on an axis ZZ to counterbalance the mass of the screen. A center of mass of the screen lies on axis XX', which is central to bearing housings 40, 41 and which are in turn located between the ends 12, 13 of the screen to make it the mass axis of the screen. Sufficient counterbalancing mass is provided and arranged to cause pulley 17 to run true, i.e., to turn about its axis Y-Y' with axis Y-Y' fixed in space. With the axis YY fixed in space by counterbalancing mass in shaft 14, weights 56 or a combination of the two, the screen moves in a circular path about the axis Y-Y. The radius of such a circular path (called the radius of gyration) is equal to the distance between the axes XX' and Y-Y.

In the assembly of a screen according to the described embodiment, the ends of vibrator housing 30 are inserted into the .

apertures

28, 29 defined by the annular rings 26, 27 which are made an integral part of

side walls

20, 21. Welds 32-35 are applied making vibrator housing 30 an integral unitary part of the screen body 10. The drive shaft 14 is arranged to position

journals

36, 37 and bearing assemblies 40, 41 concentric to the vibrator housing 30 and the bolts 46 connect the annular collar 44 of each bearing assembly 40, 41, to the adjacent of the annular rings 26, 27. When power is applied to the motor 15, the belts 16 turn pul ley 17 and rotate drive shaft 14 about axis Y-Y'. The mass of the screen represented by the axis XX and the mass of the counterweight represented by axis Z Z, both trace circular paths about axis Y-Y concentric to the vibrator housing 30 and concentric to the welds 3235 which make housing 30 an integral unitary part of screen body 10. The clearance 52 isolates the axially extending cylindrical portions 48 of bearing asing operation of the screen.

From the foregoing detailed description of the present invention it has been shown how the objects of the present invention have been attained in a preferred manner. However, modification and equivalents of the disclosed concepts such as readily occur tothose skilled in the art are intended to be included in the scope of this invention. Thus, the scope of the invention is intended to be limited only by the scope of the claims such as are or may hereafter be, appended hereto.

The embodiments of the invention in which an exclusive property or privilege isclaimed are defined as follows:

1. In a vibrating screen arranged to gyratev about a having inner surfaces facing toward each other and outer surfaces facing away from each other and each side wall defining an aperture therethrough, said apertures being in horizontal and vertical-register, a cylindricalvibrator housing axially aligned with the side wall apertures and having a midportion spanning the space between the side walls, a vibrator drive shaft arranged within the cylindrical vibrator housing having a journal on each end concentric to the vibrator housing, and a bearing housing assembly mounted around each journal and connected to the screen body, the improvement comprising:

A. the cylindrical vibrator housing having an end portion connected to each aperture defining side wall;

B. each bearing housing having a vertical surface adjacent and connected to the outer side of theadjacent aperture defining side wall to support the bearing housing and drive shaft relative to the vibrator housing and side walls;

C. each bearing housing being provided with a cylindrical portion projecting axially inward of the adjacent side wall and into the adjacent end of the cylindrical vibrator housing with the cylindrical portion of the bearing housing being spaced radially inward of the vibrator housing along the entire axial length of said cylindrical portion of the bearing housing and providing a clearance therebetween around the entire circumference thereof isolating the cylindrical portion of the bearing housing from distortion of the vibrator housing;

D. the end portions of the cylindrical vibrator housing project into the aperture defined by the side wall to which the ends of the housing are connected; and

E. the end portions of the cylindrical vibrator housing are connected to the side walls by a weld connecting the outer circumference of the vibrator housing to the inner surface of the adjacent side wall and by a weld connecting the inner circumference of the side wall defined aperture to the adjacent end of the vibrator housing.

Claims

1. In a vibrating screen arranged to gyrate about a horizontal axis of gyration and having a screen body with a pair of horizontally spaced vertical side walls having inner surfaces facing toward each other and outer surfaces facing away from each other and each side wall defining an aperture therethrough, said apertures being in horizontal and vertical register, a cylindrical vibrator housing axially aligned with the side wall apertures and having a midportion spanning the space between the side walls, a vibrator drive shaft arranged within the cylindrical vibrator housing having a journal on each end concentric to the vibrator housing, and a bearing housing assembly mounted around each journal and connected to the screen body, the improvement comprising: A. the cylindrical vibrator housing having an end portion connected to each aperture defining side wall; B. each bearing housing having a vertical surface adjacent and connected to the outer side of the adjacent aperture defining side wall to support the bearing housing and drive shaft relative to the vibrator housing and side walls; C. each bearing housing being provided with a cylindrical portion projecting axially inward of the adjacent side wall and into the adjacent end of the cylindrical vibrator housing with the cylindrical portion of the bearing housing being spaced radially inward of the vibrator housing along the entire axial length of said cylindrical portion of the bearing housing and providing a clearance therebetween around the entire circumference thereof isolating the cylindrical portion of the bearing housing from distortion of the vibrator housing; D. the end portions of the cylindrical vibrator housing project into the aperture defined by the side wall to which the ends of the housing are connected; and E. the end portions of the cylindrical vibrator housing are connected to the side walls by a weld connecting the outer circumference of the vibrator housing to the inner surface of the adjacent side wall and by a weld connecting the inner circumference of the side wall defined aperture to the adjacent end of the vibrator housing.