US3796299A - Vibratory material handling device with variable force application - Google Patents

Vibratory material handling device with variable force application Download PDF

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US3796299A
US3796299A US3796299DA US3796299A US 3796299 A US3796299 A US 3796299A US 3796299D A US3796299D A US 3796299DA US 3796299 A US3796299 A US 3796299A
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Prior art keywords
vibratory
handling
shafts
gravity
center
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Albert Musschoot
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GENERAL KINEMATICS CORP US
GEN KINEMATICS CORP
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GEN KINEMATICS CORP
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G27/00Jigging conveyors
    • B65G27/10Applications of devices for generating or transmitting jigging movements
    • B65G27/16Applications of devices for generating or transmitting jigging movements of vibrators, i.e. devices for producing movements of high frequency and small amplitude
    • B65G27/18Mechanical devices
    • B65G27/20Mechanical devices rotating unbalanced masses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/10Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
    • B06B1/16Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/284Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens with unbalanced weights
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/36Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro in more than one direction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens

Abstract

An apparatus for performing work on material through vibration. An elongated material receiving surface is provided along with a mount for the same that permits the surface to be vibrated. A vibrating mechanism including two spaced vibratory force generating devices may be adjustably secured to the material receiving surface in any of a variety of positions with respect to the center of gravity of the latter so that the direction of the vibratory force applied to the material receiving surface may be varied.

Description

United States Patent [1 1 Musschoot Mar. 12, 1974 [54] VIBRATORY MATERIAL HANDLING 3,648,862 3/1972 S ugirnoto 198/220 DB X DEVICE WITH VARIABLE FORCE FOREIGN PATENTS OR APPLlCATl N APPLICATION O S 62,136 6/1955 France 209/367 [75] Inventor: Albert Musschoot, Barrington, Ill.
[73] Assignee: General Kinematics Corporation, Primary ExaminerEdward A. Sroka Barrington, Ill. Attorney, Agent, or Firm-Hofgren, Wegner, Allen, 22 Filed: July 8, 1971 Stenma & Mccmd [21] Appl. No.: 160,679 [57] ABSTRACT V An apparatus for performing work on material [22] through vibration An elongated material receiving E i 87 surface is provided along with a mount for the same 1 le 0 care 269/326 that permits the surface to be vibrated. A vibrating mechanism including two spaced vibratory force generating devices may be adjustably secured to the mate- [56] References Clted rial receiving surface in any of a variety of positions UNITED STATES PATENTS with respect to the center of gravity of the latter so 2,312,477 3/1943 Pollitz 209/329 that the direction of the vibratory force applied to the 2,200,724 5/1940 Robins... 198/220 DB X material receiving surface may be variecL 3,226,989 vH1966 Robins... 198/220 DB X 3,053,379 9/1962 Roder l98/220 DB 1 Claim, 6 Drawing Figures PMENIEU MRI 2 i974 I 721/6 weri/ ffusscioi VIBRATORY MATERIAL HANDLING DEVICE WITH VARIABLE FORCE APPLICATION BACKGROUND OF THE INVENTION This invention relates to material handling vibratory devices such as material classifiers or vibratory conveyors.
Oftentimes, material handling vibratory devices are called upon to handle different types of material having different characteristics which must be compensated for in a vibratory driving mechanism to insure proper handling. In such cases, rather severe adjustments have had to be made to a system when the same is to operate on a different material from that on which it was previ ously operating. The adjustments are often time consuming, and in some cases, rather intricate and thus there is a very real need for a vibratory, material handling device that may be easily adjusted to accommodate different materials having different handling characteristics or which may be adjusted to handle a single material in different ways as exigencies of a particular situation may require.
SUMMARY OF THE INVENTION It is the principal object of the invention to provide a new and improved vibratory material handling device which may be easily adjusted to change the vibratory forces applied to a material handling device to accommodate ditferent materials or different types of treatment of the same material.
The exemplary embodiment of the invention achieves the foregoing object by means of a construction including a material handling device including a material receiving surface mounted for vibratory movement to be imparted thereto by a vibrating means. According to the preferred embodiment, a vibrating means in the form of a pair of independent, spaced, vibratory force imparting means is employed and means are provided whereby the vibratory device may be connected to the material handling device at a variety of different locations without changing the attitude of the former with respect to the latter for ease of adjustment. According to one embodiment, the vibratory force generating devices comprise rotary motors driving eccentric weights about spaced, but parallel axes. By changing the location of the vibratory mechanism with respect to the center of gravity of the material handling device, the direction of application of vibratory force may be altered and chosen to accommodate various handling characteristics of different materials or to provide different types of material handling for a single type of material.
Other objects and advantages will become apparent from the following specification taken in conjunction with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS FIG. I is a side elevation of a vibratory material handling device made according to the invention;
FIG. 2 is a substantially vertical section taken approximately along the line 2-2 of FIG. 1;
FIG. 3 is a view of the vibratory mechanism employed;
FIG. 4 is a schematic illustrating the direction of vibratory force application for one position of the vibratory mechanism relative to the material handling de- DESCRIPTION OF THE PREFERRED EMBODIMENT Before entering a detailed discussion of structure employed in the invention, to assist in understanding the invention, it should be observed that it has been discov ered by the applicant that the direction of force application to a material handling device by a vibratory mechanism of a particular type can be altered by changing the position of the vibratory device relative to the material handling device and specifically, the center of gravity of the latter.
As is generally alluded to in the preceding paragraph, a particular type of vibratory device is required and specifically, one that generates bi-directional vibratory forces at two spaced points. The direction of application of force to the material handling device will then be along a line drawn between the mid-point of a line extending between the two points of force generation and the center of gravity of the material handling device. Thus, by moving the position of a vibratory mechanism of the character mentioned with respect to the center of gravity of a material handling device, the direction of application of force to the material handling device can be varied.
This phenomenon can be used to change the conveying direction of a vibratory conveyor, the rate of conveying in a particular direction or, in the case of a particle classifier, the magnitude of vibratory motion imparted to the material being classified.
One fonn of an apparatus embodying the foregoing principle as illustrated in the drawings and with reference to FIGS. 1 and 2 is seen to include a trough-like member generally designated 10 having an imperforate bottom 12 and upwardly spaced classifying screens I4 and 16. The screens 14 and 16 are secured in their spaced relation as illustrated in FIG. 2 by cross members 18 and screen retaining brackets 20, neither of which form a part of the instant invention.
At the upper end of the trough-like member 10, a vibratory mechanism, generally designated 22 is mounted by means of bolts 24 and nuts 26 extending through apertures 28 in the upper side walls of the trough-like member 10. As illustrated in FIG. 1, a greater number of the apertures 28 are provided than are necessary for securing the vibrating mechanism 22 to the trough-like member 10 so that the position of the former with respect to the latter may be selectively varied.
The trough-like member 10 is mounted for vibratory movement by means of upstanding cars 30 mounting eyelets 32 for receipt of suspenditory cables 34.
The vibratory mechanism 22 comprises a pair of spaced vibratory devices, each generally designated 36.
As can be observed in FIGS. 2 and 3, each vibratory device 36 comprises an electric motor 38 having a rotary output shaft with opposed ends 40, each eccentrically mounting weights 42. According to the preferred embodiment, there is no connection between the motors 38 such as an electrical or a mechanical connection. Such is not necessary for in operation it has been found that the two motors will tend to synchronize with each other at the same speed. Preferably, the direction of rotation of the output shafts of the motors 38 is opposite so that only a bi-directional total force will be applied to the material handling device in the form of the trough-like member 10, sideways forces cancelling out by reason of the opposite direction of rotation of the weights 42. i
Normally, with such a system, one would believe that the direction of force application would be perpendicular to a plane 50 encompassing the parallel shafts'40 of the motors 38. However, as mentioned previously, it has been found that the direction of force application is actually along a' line extending from a point 52 midway between the shafts 40 on the plane 50 and the center of gravity 54 of the material handling device. As a result, when the vibratory mechanism 22 is in the positions shown in solid line in FIG. 1, force will be applied in the direction of the line 56. If the vibratory mechacenter of gravity is, of course, due to the change in location of the vibratory mechanism which is rigidly secured to the material handling device.
FIGS. 4-6, inclusive, illustratevarious orientations that may be achieved, all without changing the attitude of the vibratory mechanism 22 with respect to the troughlike material handling device 10. In FIG. 4, force will be applied along the line 60 which would result in material being conveyed toward the right at a relatively rapid rate. In FIG. 5, no conveying action would be present. Rather, the material would be vibrated in a vertical direction represented by the line 62. In FIG. 6, a slow conveying rate toward the left would prevail by reason of force application along the line 64 As a result of the foregoing construction, it will be appreciated that material conveying rates may alter according to the invention or, if desired, the same may be used for pure classification purposes. One particular advantage to this application is for combination classifying and conveying. By appropriately positioning the vibratory mechanism with respect to the trough-like member 10, conveying action may be obtained with material residence time sufficient to insure full and complete classification.
Thus, by movement of appropriate vibratory force generating means with respect to the center of gravity of the material handling device, either by translation as specifically disclosed, rotation (so long as the rotation is not about an axis coinciding with the point- 52) or combinations thereof, the direction of force application to the material handling device can be selectively varied.
And it will be appreciated that the foregoing features and advantages may all be obtained'whilc minimizing time consuming adjustments, it merely being necessary to remove the bolts securing the vibrating mechanism 22 to the trough-like member 10, shift the latter and reconnect the same; and no expensive equipment for varying the speed of the motors or for varying the tuning of resilient spring systems or the like is required.
1. A vibratory material handling device comprising: means defining an elongated surface adapted to carry material to be worked upon;a pair of parallel walls on either side of said surface and extending in the direction of elongation thereof; a vibratory mechanism including a frame, a pair of spaced parallel shafts rotatably mounted in the frame and. extending transversely of the direction of elongation of the material carrying surface, an eccentric weight at each end of each shaft, means for rotating one of said shafts, independent means for rotating the other of said shafts, said frame carrying said shafts and rotating means in fixed position relative to each other; means mounting said material carrying surface for vibratory movement, means on said walls defining aguide path therealong and providing means for securing the vibratory mechanism thereto; and-means for selectively fastening said vibratory mechanism to said securing means at varying points spaced along the guide path to locate the midpoint of a line joining said shafts in a first position on one side of the center of gravity of the device, in a second position where the mid-point is vertically aligned with the center of gravity of said device, and in a third position where said mid-point is on the other side of the center of gravity, whereby to cause said device to convey material thereon in one direction when the vibra" tory mechanism is in said first position, in the opposite direction when the vibratory mechanism'is in the third position, and to vibrate material without conveying the same when the vibratory mechanism is in the second position.

Claims (1)

1. A vibratory material handling device comprising: means defining an elongated surface adapted to carry material to be worked upon; a pair of parallel walls on either side of said surface and extending in the direction of elongation thereof; a vibratory mechanism including a frame, a pair of spaced parallel shafts rotatably mounted in the frame and extending transversely of the direction of elongation of the material carrying surface, an eccentric weight at each end of each shaft, means for rotating one of said shafts, independent means for rotating the other of said shafts, said frame carrying said shafts and rotating means in fixed position relative to each other; means mounting said material carrying surface for vibratory movement, means on said walls defining a guide path therealong and providing means for securing the vibratory mechanism thereto; and means for selectively fastening said vibratory mechanism to said securing means at varying points spaced along the guide path to locate the mid-point of a line joining said shafts in a first position on one side of the center of gravity of the device, in a second position where the mid-point is vertically aligned with thE center of gravity of said device, and in a third position where said mid-point is on the other side of the center of gravity, whereby to cause said device to convey material thereon in one direction when the vibratory mechanism is in said first position, in the opposite direction when the vibratory mechanism is in the third position, and to vibrate material without conveying the same when the vibratory mechanism is in the second position.
US3796299D 1971-07-08 1971-07-08 Vibratory material handling device with variable force application Expired - Lifetime US3796299A (en)

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Cited By (37)

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US4128161A (en) * 1975-02-14 1978-12-05 Yonkers Edward H Vibratory device
WO1979000453A1 (en) * 1977-12-29 1979-07-26 William V Spurlin Vibratory device for feeders and the like
US4771894A (en) * 1985-09-14 1988-09-20 Lindemann Maschinenfabrik Gmbh Device for separating materials of value from a mixture
US5392898A (en) * 1994-06-06 1995-02-28 Food Engineering Corporation Dual drive conveyor system with vibrational control apparatus and method of determining optimum conveyance speed of a product therewith
US5460259A (en) * 1994-06-03 1995-10-24 Food Engineering Corporation Conveyor support apparatus for straight-line motion
US5547068A (en) * 1995-08-11 1996-08-20 Spurlin; W. V. Center beam two mass vibratory device
US5584375A (en) * 1994-12-21 1996-12-17 Food Engineering Corporation Single drive vibrational conveyor with vibrational motion altering phase control and method of determining optimal conveyance speeds therewith
GB2318401A (en) * 1996-10-15 1998-04-22 Rig Technology Ltd Vibratory screening machine
WO1998016328A1 (en) * 1996-10-15 1998-04-23 Rig Technology Limited Improved vibratory screening machine
US5799722A (en) * 1995-03-02 1998-09-01 Buziashvili; Boris Method and apparatus for continuous metal casting
US5938001A (en) * 1997-01-16 1999-08-17 Fmc Corporation Vibratory conveyor apparatus with phase-optimized conveyor drive
US5979640A (en) * 1997-05-21 1999-11-09 Carman Industries, Inc. Vibrating conveyor drive with continuously adjustable stroke
US6079550A (en) * 1998-01-08 2000-06-27 Allen Machinery, Inc. Vibratory conveyor
US6325202B1 (en) 1999-11-22 2001-12-04 Fmc Corporation Interconnection for a conveyor system
WO2002011905A1 (en) * 2000-08-09 2002-02-14 Ludowici Mineral Processing Equipment Pty Ltd Exciter apparatus
AU2001277404B2 (en) * 2000-08-09 2006-05-25 Flsmidth A/S Exciter apparatus
US20060243643A1 (en) * 2002-11-06 2006-11-02 Eric Scott Automatic separator or shaker with electromagnetic vibrator apparatus
US20080128334A1 (en) * 2002-11-06 2008-06-05 Eric Landon Scott Automatic vibratory separator
US20090057205A1 (en) * 2007-08-31 2009-03-05 Schulte Jr David Lee Vibratory separators and screens
US20090105059A1 (en) * 2002-11-06 2009-04-23 Khaled El Dorry Controlled centrifuge systems
US20090120846A1 (en) * 2005-11-16 2009-05-14 George Alexander Burnett Shale shakers with cartridge screen assemblies
US20090145836A1 (en) * 2007-12-11 2009-06-11 Paul William Dufilho Vibratory separator screens & seals
US20090178978A1 (en) * 2008-01-14 2009-07-16 Randy Charles Beebe Drilling fluid treatment systems
US20100000914A1 (en) * 2008-07-07 2010-01-07 Fallon Thomas M Method and apparatuses for screening
US20100038143A1 (en) * 2008-08-14 2010-02-18 George Alexander Burnett Drill cuttings treatment systems
US20100089652A1 (en) * 2008-10-10 2010-04-15 National Oilwell Varco Shale Shakers with Selective Series/Parallel Flow Path Conversion
US20100089802A1 (en) * 2008-10-10 2010-04-15 George Alexander Burnett Systems & methods for the recovery of lost circulation & similar material
US20100181265A1 (en) * 2009-01-20 2010-07-22 Schulte Jr David L Shale shaker with vertical screens
US20100235002A1 (en) * 2002-11-06 2010-09-16 National Oilwell Varco, L.P. Magnetic Vibratory Screen Clamping
US20100270216A1 (en) * 2008-10-10 2010-10-28 National Oilwell Varco Shale shaker
US7980392B2 (en) 2007-08-31 2011-07-19 Varco I/P Shale shaker screens with aligned wires
US8201693B2 (en) 2006-05-26 2012-06-19 National Oilwell Varco, L.P. Apparatus and method for separating solids from a solids laden liquid
US8231010B2 (en) 2006-12-12 2012-07-31 Varco I/P, Inc. Screen assemblies and vibratory separators
US8316557B2 (en) 2006-10-04 2012-11-27 Varco I/P, Inc. Reclamation of components of wellbore cuttings material
US9073104B2 (en) 2008-08-14 2015-07-07 National Oilwell Varco, L.P. Drill cuttings treatment systems
US20150353290A1 (en) * 2012-12-20 2015-12-10 Sandvik Mining And Construction Oy Vibrating equipment and metod of processing material
US9643111B2 (en) 2013-03-08 2017-05-09 National Oilwell Varco, L.P. Vector maximizing screen

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US4313535A (en) * 1979-06-15 1982-02-02 Applied Magnetics Corporation Excited frame, vibratory conveying apparatus for moving particulate material
US7186347B2 (en) 2002-04-11 2007-03-06 General Kinematics Corporation Vibratory apparatus for separating liquid from liquid laden solid material
US6598734B1 (en) * 2002-08-15 2003-07-29 Carrier Vibrating Equipment, Inc. Vibratory distribution conveyor
US20090179134A1 (en) * 2008-01-10 2009-07-16 General Kinematics Corporation Modular deck assembly for a vibratory apparatus

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US2312477A (en) * 1940-08-03 1943-03-02 Iowa Mfg Company Vibrating screen
FR62136E (en) * 1951-10-31 1955-06-10 Charles Motz & Cie Ets Sieve or sieve comprising a vibrator located at its center of gravity
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Cited By (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4128161A (en) * 1975-02-14 1978-12-05 Yonkers Edward H Vibratory device
WO1979000453A1 (en) * 1977-12-29 1979-07-26 William V Spurlin Vibratory device for feeders and the like
US4218929A (en) * 1977-12-29 1980-08-26 Syn-Energy, Inc. Vibratory device for feeders and the like
US4771894A (en) * 1985-09-14 1988-09-20 Lindemann Maschinenfabrik Gmbh Device for separating materials of value from a mixture
US5460259A (en) * 1994-06-03 1995-10-24 Food Engineering Corporation Conveyor support apparatus for straight-line motion
US5392898A (en) * 1994-06-06 1995-02-28 Food Engineering Corporation Dual drive conveyor system with vibrational control apparatus and method of determining optimum conveyance speed of a product therewith
US5584375A (en) * 1994-12-21 1996-12-17 Food Engineering Corporation Single drive vibrational conveyor with vibrational motion altering phase control and method of determining optimal conveyance speeds therewith
US5799722A (en) * 1995-03-02 1998-09-01 Buziashvili; Boris Method and apparatus for continuous metal casting
US5547068A (en) * 1995-08-11 1996-08-20 Spurlin; W. V. Center beam two mass vibratory device
GB2318401A (en) * 1996-10-15 1998-04-22 Rig Technology Ltd Vibratory screening machine
WO1998016328A1 (en) * 1996-10-15 1998-04-23 Rig Technology Limited Improved vibratory screening machine
GB2318401B (en) * 1996-10-15 1999-03-17 Rig Technology Ltd Improved vibratory screening machine
AU711860B2 (en) * 1996-10-15 1999-10-21 Varco I/P Inc. Improved vibratory screening machine
US5938001A (en) * 1997-01-16 1999-08-17 Fmc Corporation Vibratory conveyor apparatus with phase-optimized conveyor drive
US5979640A (en) * 1997-05-21 1999-11-09 Carman Industries, Inc. Vibrating conveyor drive with continuously adjustable stroke
US6079550A (en) * 1998-01-08 2000-06-27 Allen Machinery, Inc. Vibratory conveyor
US6325202B1 (en) 1999-11-22 2001-12-04 Fmc Corporation Interconnection for a conveyor system
WO2002011905A1 (en) * 2000-08-09 2002-02-14 Ludowici Mineral Processing Equipment Pty Ltd Exciter apparatus
US6889820B2 (en) 2000-08-09 2005-05-10 Ludowici Mineral Processing Equipment Pty Ltd Exciter apparatus
AU2001277404B2 (en) * 2000-08-09 2006-05-25 Flsmidth A/S Exciter apparatus
US8746459B2 (en) * 2002-10-17 2014-06-10 National Oilwell Varco, L.P. Automatic vibratory separator
US20090242466A1 (en) * 2002-10-17 2009-10-01 George Alexander Burnett Automatic Vibratory Separator
US20100235002A1 (en) * 2002-11-06 2010-09-16 National Oilwell Varco, L.P. Magnetic Vibratory Screen Clamping
US20090105059A1 (en) * 2002-11-06 2009-04-23 Khaled El Dorry Controlled centrifuge systems
US8172740B2 (en) 2002-11-06 2012-05-08 National Oilwell Varco L.P. Controlled centrifuge systems
US8695805B2 (en) 2002-11-06 2014-04-15 National Oilwell Varco, L.P. Magnetic vibratory screen clamping
US8561805B2 (en) 2002-11-06 2013-10-22 National Oilwell Varco, L.P. Automatic vibratory separator
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Also Published As

Publication number Publication date
JPS5820676B1 (en) 1983-04-25
DE2232831B2 (en) 1976-05-13
AU4401372A (en) 1974-01-03
DE2232831C3 (en) 1980-08-28
DE2232831A1 (en) 1973-01-18
AU459592B2 (en) 1975-03-27
USRE29512E (en) 1978-01-10
CA961790A1 (en)
CA961790A (en) 1975-01-28

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