Патент USA US2872015код для вставки
Feb. 3, 1959 2,872,045 T. WIRTH ET AL OSCILLATING CENTRIFUGE Filed Oct. 29, 1957 2 Sheets-Sheet l MN? _ d.mw sMmbNw v _ W“..WNW;| M xv| mwmm w“n u % m“ . I‘\w WeN_1-._F|. | ~| my?f gZT g \B 1n RT MM”.. TKKWW“NA. YW\ MW 2” @ my.“ mI! i & Feb. 3, 1959 T. WlRTH ET AL 2,872,045 OSCILLATING CENTRIFUGE Filed Oct. 29, 1957 2 Sheets—Sheet 2 INVENTORS, Thomas Wz'rfz BY KarF-A’ezivz 1142662164 Kai’! VVézzger United States ' ate-nt ICQ mans; Patented Feb. 3, 1959 2 2,872,045 OSCILLATIN G CENTRIFUGE Thomas Wirth, Dachau, Karl-Heinz Nebhuth, Darm building structure and to adjacent machines may be over come by providing a foundation for the centrifuge having as great a mass as possible, and by providing the founda~ tion with an elastic support, for example, of cork or rub ber, which tends to reduce the amplitude of the alternat ing stresses transmitted to the building structure. How ever, such foundations are costly and are not always prac stadt-Arheilgen, and Karl Wenger, Munich-Allach, Germany tical, for example, in cases where the centrifuge is to be installed on the upper ?oors of a building.v Furthermore, Application October 29, 1957, Serial No. 693,086 10 the vibrations of the centrifuge frame are transmitted to the drive motors of the centrifuge mounted on the frame 19 Claims. (Cl. 210-370) ‘ thereof, and also to the transmission members, such as, belts, drive shafts and the like, thereby to increase the load on the motor bearings, the motor windings and the 15 This invention relates generally to centrifuges for re transmission members and to correspondingly reduce their moving water or other liquids from a granular material, useful life. In the described existing arrangement the and more particularly is directed to improvements in bearings carrying the spindle are also subjected to high centrifuges of the kind wherein the basket is oscillated in stresses by reason of the oscillation of the balancing the direction of-its rotational axis in order to effect the mass, that is, the frame of the centrifuge, which does not ‘continuous discharge of the dried granular material or 20 rotate with the spindle, and whereon the bearings is other solids. thereby increased. With centrifuges of the kind described above, the axial Accordingly, it is an object of the present invention to oscillation of the basket carries the dried solid material provide a centrifuge of the kind described above, and \over the lip of the conical basket wall for discharge from wherein the axial oscillations of the centrifuge basket the basket without damage to the granular structure of 25 for effecting the continuous discharge of the dried solid ‘the dried material, whereas the mechanical discharging material are isolated fromthe foundation of the centrifuge ‘devices with which other centrifuges are equipped, tend and also from the drive motors, the transmission mem to destroy the granular structure of the dried solid bers and the bearings carrying the spindle. material. In accordance with an aspect of this invention, the In existing centrifuges of the kind wherein the basket 30 oscillations of the basket are isolated from the founda is axially oscillated in order to effect the continuous dis tion, drive motors, transmission members and the bearings charge of dried solid material therefrom, the basket is elastically connected to the spindle of the centrifuge either supporting the spindle by elastically connecting both the mass of the basket and the balancing mass to the frame by an elastic bottom in the basket or by springs which of the centrifuge, but in opposite directions, so that the :are connected between a rigid bottom in the basket and 35 forces transmitted by the resulting dual-mass oscillating the spindle, thereby freeing the basket for oscillation system to the frame of the centrifuge always act simul axially relative to the spindle, while the spindle is axially taneously upon the latter, but in opposite directions, so movable in a support which is, in turn, elastically con that oscillation of the centrifuge frame is essentially nected to the frame of the centrifuge. In a centrifuge eliminated. ' 40 having the above arrangement, axial oscillations are di Further, in accordance with the invention, mutual can rectly imparted to the slidable spindle which forms a bal cellation of the forces exerted on the ‘centrifuge frame by ancing mass elastically coupled to the basket to form an the oscillating basket and balancing mass, respectively, is oscillating system having dual masses. With such a dual ensured by providing an oscillation generator operatively mass oscillating system, the masses of the basket and connected'to the balancing mass and to the basket in order 45 spindle, respectively, may oscillate either in the same or to produce synchronous, inverse or opposed oscillations in opposite directions, and alternating forces are always of the basket and of the balancing mass at all frequencies. transmitted from the‘ support of the centrifuge to the A further feature of the invention resides in providing frame or foundation thereof by Way of the elastic‘ con a drive assembly for rotating the spindle and the basket nection therebetween. These alternating forces will be 50 which does not participate in the oscillations of the basket relatively small when the masses of the basket and spindle, and the balancing mass, so that such oscillations are iso respectively, oscillate in opposite directions, however, lated from the elements of the drive assembly, for ex since the oscillations are directly imparted only to the ample, drive motors, drive shafts, transmission belts and mass of the spindle, the masses of the basket and spindle the like. ' will oscillate in opposite directions only within a narrow 55 The above, and other objects, features and advantages range of frequencies. of the‘ invention, will be apparent in the following de In other existing centrifuges of the kind wherein the tailed description of an illustrative embodiment thereof dried solid material is discharged from the basket by which is to be read in connection with the accompanying effecting axial oscillation of the latter and employing a drawing-forming a part hereof, and wherein: dual mass oscillating system, the frame of the centrifuge 60 Fig. 1 is a longitudinal, sectional view of an oscillating acts as the balancing mass and is elastically connected to the foundation so that, in such an arrangement, the mo mentum of the masses is also transmitted to the founda tion by way of the elastic connection between the latter centrifuge embodying the present invention, with auxiliary momentum of the masses are, in turn, transmitted from Referring to the drawing in detail, and initially to Fig. devices associated with the centrifuge being shown schematically; Fig. 2 illustrates additional auxiliary devices; and and the oscillating'mass of the centrifuge frame. The Fig. 3 is a diagrammatic representation of the operating 65 alternating forces resulting from the transmission of the principles of the centrifuge illustrated in Fig. 1. the foundation of the ?oor of the building structure hous 1 thereof, it will be seen that an oscillating centrifuge em ing the centrifuge or to adjacent machinery, and fre bodying the present invention and there generally identi~ quently causes structural damage to the building or inter ?ed by the-reference numeral 10 includes a centrifuge ference with the mechanical e?iciency, or even operative~ 70 basket 11 having a frusto-conical, perforated side wall 12 ness, of the centrifuge and of adjacent machines. Such and an end wall 13 closing the relatively small diameter transmission of the forces ‘from the foundation to the end ‘of the basket. The basket 11 is arranged with its 12,8 more 4 3 central axis extending horizontally and'is mounted within atv 33a, -is ‘bored and carries a diametrically extending a centrifuge frame or housing 14, as hereinafter described in detail, for rotation about its horizontal central axis and cross-piece 33 extending outwardly through diametrically opposed pairs of registering, axially elongated slots 34 and for oscillation or reciprocation ‘inith'e anguish-urinating of rotation. A stationary feed pipe 15 extends saws wardly into the frame or housing lli'aiiidiis then bent," as cross-piece 33 are secured within the balancing mass 31. 35 in the hollow portion 22a of the spindle and in the hollow shaft 18, respectively, while the outer ends of the open, relatively large‘di'ameter ‘end of the-'latter'and‘to terminate adjacent the end wall‘13‘f0r suppiyingmeslan-y A relatively strong helical compression spring 36 ex tends around the hollow shaft 18 and abuts, at its opposite ends, against the sleeve 29 and the balancing mass 31, re is to be centrifuged, so that ‘such material will not spun‘ and 3S acting as elastic spacers extend around the hollow shown, to extend axially into the-‘basket 11 through'the , of liquids and solid materials which are to 'be‘separaréd 10 spectively,to act as an elastic-coupling between the bal ancing mass, which is connected by the cross-piece 33 to to the centrifuge basket. The angle of inclination of the oscillate with the rod 32, and the sleeve 29 which is con perforated side wall 12 ‘of the centrifuge basket relative nected, by the pin '23, to oscillate with the spindle 22 to the central axis of rotation of the latter is selectedQto and basket 11. Further, helical compression springs 37 be smaller'than the angle of repose vof the'material which shaft 18 and are axially interposed between the sleeve 29 taneously ?ow out'of the open, large diameter end of the and a collar 39 abutting against the partition 16, and be basket 11, and will be'discharged through‘the open end tween the 'rna'ssiilan'd a collar 44} abutting against the of the basket only in'response to axial oscillation of the casing 20 secured in-the end'wall 21, respectively. latter. Since the amplitude and frequency of the axial oscillations of’ basket 11 are adjustable, as hereinafter 20 _ ‘In order to effect synchronous oscillations of the basket 11 ‘and balancing mass 31 in opposed directions at all indicated in detaihthe dwell time of the solid material in the basket 11 prior to discharge'from the latter can be varied in order to regulate the operation of the centrifuge in connection with the properties of the solid material ‘frequencies, the'centrifug‘eltl embodying the presentin~ volition includes a’cylinder 41 which is‘slidable within the cylindrical casing 20 and axially coupled to the end of being separated. In order to‘ mount the basket 11 for rotation and axial oscillation within the frame or housing '14, the latter is the ‘spindle '22 remote from the basket‘ll, and a piston 42 which is slidable within the cylinder 41 and connected to the'end of the rod 32 remote from the cross-piece 33. Thus, ‘when ?uid under pressure isYadmittcd to the cylinder “that-the‘ right hand side of the piston 42, as viewed in one end of an open-ended, hollow shaft‘ 18, and the latter 30 Fig. 1, the piston 42 as well as the balancing mass 31 ‘will be' driven’toward the left, while the cylinder 41, the is also rotatably supported, adjacent its opposite end, in spindle 22 and the basket 11 will be driven toward the a bearing'19' fixed in one end of a cylindrical casing 20 which‘ is suitably secured in an end wall 21 of the frame _ right. 'Conversely, when fluid under presusre is admitted to' the cylinder 41 at‘ the left hand side of the piston 42, or housing 14. A spindle 22 is rigidly secured, at one end, to’ the end wall 13 of basket 11 and extends axially 35 as‘vi‘ewed'in‘Fig. l, the balancing mass 31 is driven toward the: right,‘while the basket 11 is driven toward the left. from the latter through the hollow shaft 18. In vorder ‘In a modi?ed construction according to our invention, to coupleithe‘ spindle 22' to the hollow shaft 18 for'rota the ‘balancing mass 31 is replaced by a second basket tion with the latter, while permitting axial oscillation of analogous to‘basket 11, in which case we provide within the spindle relative to the shaft 18 which is held against axial displacement with respect to the housing 14, a pin 40 the spindle ‘22 instead of the‘ rod 32 a rod that passes through‘ they piston 42 and also through the end wall of or wedge 23 passes through a diametrical‘ bore ‘in the spindle 22 and extends radially outward through'a pair , the cylinder '41 remote from the'pulley 25. The second basket is secured, beyond said end wall of the cylinder of diametrically opposed, axially elongated slots 24'pro 41, to the free end of the rod. With this construction, vided in the hollow shaft 18 intermediate the ends of the the second basket acts as a balancing mass since the two latter. baskets synchronously voscillate ‘in opposite directions at In order to effect rotation of the hollow shaft 18, and the same frequency with the same amplitude. The hence also rotation of the spindle 22 by way of the cou throughput of this double centrifuge having the balanced pling provided between the shaft 18 and spindle 22 in the characteristics described above with reference to the em form of the pin 23 engaging in slots 24, a pulley 25 is bodiment illustrated in Fig. l is practically doubled. suitably secured on the end of hollow shaft 18 remote According to a modi?cation of the embodiment shown from the basket 11 and is’ engaged by endless transmission and described hereinbefore, the springs 36, 37 and 38 are belts 26 which also run around a pulley 27 secured on the provided with ‘a partition 16 extending thereacross and centrally carrying a bearing 17 which rotatably supports shaft of a drive motor 28. Since the hollow shaft 18 is replaced by pneumatic and hydraulic pressure'cylinders. For instance, 'in such modi?cation a sleevelike piston is only rotatable and does not participate in they axial oscil slidably mounted on'the hollow shaft 18 and abuts atone lations imparted to the spindle‘ 22, as ‘hereinafter de end against the sleeve 29. The piston is guided in a scribed in detail, the bearings 17 and 19 supporting ‘the cylinder, the annular'bottom of which abuts accordingly shaft 13, the transmission consisting‘of the belts 26 and against the collar 39. Air enclosed in the cylinder‘space the pulleys 2S and 27 and the motor‘ 28‘ a‘re'all isolated is compressed whenhydraulic fluid is admitted to the pis from the effects of such oscillations and ‘are'th‘ereby pro tected against the increased we'ar‘that results from the ill) ton 42 at the side of the rod 32, and when hydraulic ?uid is admitted to the other side of the piston the air expands. transmission of the oscillations to such operating parts. This device constitutes an elastic intermediary member ' A sleeve 29 is slidably'mounted upon the‘ hollow shaft 18 analogous‘ to helical spring 37. The elasticity of this and is provided with bores 30 receiving the opposite ends intermediate member can be increased by connecting to of the pin 23 so that the sleeve 29 is thereby coupled to the air-?lled cylinder space an expansion chamber, such the spindle 22 for axial oscillation with the latter with as is customary with piston pumps. An air-holding ex respect to the hollow shaft 18. p A balancing mass, preferably in the form of ‘an annular member 31 which is split ‘along a diarhetric plane to pro vide'two separable parts which can‘ be secured together around the hollow shaft v18, is slidably mountedon'the 70 shaft 18 between the sleeve 29 and the end wall 21 ‘of housing 14. The spindle 22 is formed with a‘hollow portion 22a opening axially in the direction‘ away from the basket 11 and slidably receiving and‘ 32 which,iat' its inner end within the hollow/‘portion 22a of the spindle, pansion chamber is ‘definitely required when the hydraulic fluid for the cylinder is a liquid and the necessary elas ticity of the system must be obtained despite the incom pressibility of the liquid. It is also‘ possible to place a cylinder and piston analo 'gous to the cylinder 41 and piston 42, respectively, inside of the hollow shaft‘ 18. In this case, the hollow shaft assumes the function of the casing 20, and'the ‘hollow ~portion ‘of‘the spindle 22 am “as ‘the cylinder 41in’ which amen U the piston slides. The external diameter of the piston corresponds to the internal diameter of the hollow spindle portion. _ - As shown in Figs. 1 and 2, a system for supplying ?uid under pressure to the cylinder 41 alternately at the opposite sides of the piston 42 therein may include con duits 43 and 44 connected to the casing 20 and opening into annular grooves 45 and 46, respectively, formed in the inner surface of the cylindrical casing 20 at axially v) ' 6 52 between the pump 50 and the adjustable throttling valve 64 in order to absorb any pressure shocks that may be imparted to the ?uid under pressure during oper ation of the pump. Referring to Fig. 3, wherein the operating conditions achieved with the above described oscillating centrifuge are diagrammatically represented, it will be apparent that the masses a and b of the basket 11 and the balancing mass 31, ‘respectively, with the interposed helical spring 36 spaced apart locations and permanently communicating 10 coupling together the two masses created a dual-mass with radial openings 47 and 48, respectively, in the cyl- ' oscillating system, which, when the masses oscillate in inder 41 adjacent the opposite ends of the latter. The opposite directions, does not exert any momentum on the illustrated system further includes a source of ?uid 49, frame 14 by reason of the provision of the spacing springs in the form of a tank or reservoir, a pump 50 having 37 and 38 which space the oscillating system from the its inlet side connected, as by a pipe 51, to the source 16 transverse walls 16 and 21 of the frame and always exert 49, a supply line 52 for ?uid under pressure extending equal and opposite forces against the frame 14. Thus, from the discharge or outlet side of the pump 50, a the forces exerted by the springs 37 and 38 against the return line or pipe 53 emptying into the source 49, and frame 14 cancel each other, and oscillations of the centri a rotary distributing valve 54 driven by a variable speed fuge are not transmitted to the foundation supporting the motor 55 which is independent of the motor 28 for effect 20 latter or to any surrounding structure or adjacent ma ing rotation of the basket 11. The rotary distributing chines. Further, since the balancing mass 31 rotates with valve 54 is operative, when driven by the motor 55, to the basket 11, no vibrations are transmitted to the bearings alternately connect or establish communication between 17 ‘and 19 which rotatably support the hollow shaft 18 and the conduits 43 and 44 and the supply line 52 and return the bearings are thereby protected against excessive Wear. 25 line 53. The ?uid under pressure supplied to the cylinder 41 As shown merely by way of example in Fig. 2, the ‘ ‘for generating the desired oscillations of the basket and rotary distributing valve 54 may include a cylindrical balancing mass may be either a gas or a liquid, and such valve body 56 connected, as at 57, to the motor 55 for ?uid under pressure may be derived from a source of rotation by the latter within a housing 58. The valve pressurized ?uid which primarily serves other purposes, body 56 selected for illustration has four axially spaced .30 thereby to avoid the necessity for providing an individual apart slot-shaped recesses 59, 60, 59a, and 60a, which source 49 and pump 50 for each centrifuge. , . extend approximately to the axis of the valve body and Although it is desirable to have the ?uid under pressure are arranged in pairs on opposite sides. Spacedly pro supplied to the cylinder 41 alternately at the opposite vided in the housing 58 are four axially extending pipes sides of the piston 42, as described above, it is possible to 35 61, 62, 61a and 62a, each of which comprises two oppo eliminate one of the conduits 43 or 44 and to employ the sitely directed branches, as the branches 61' and 61" ‘I remaining conduit for alternately connecting the related of the pipe 61, and the branches 62' and 62" of the pipe 62. Altogether there are eight such branches, the end space in the cylinder 41 to the supply line 52 and the re portions of which are bent toward the interior of the turn line 53, respectively. Our oscillating centrifuge will operate satisfactorily even when the dual-mass oscillating valve body and open at points along generating lines of 40 system consisting of the mass of the basket 11 and the the inner wall of the cylindrical housing 58. The width balancing mass 31, in cooperation with the helical springs of the recesses 59, 60, 59a, and 60a is such that one 36, 37, 38 as elastic links, is excited in one direction only branch of each of the two pipes 61 and 62, as 61' and in the rhythm of its resonant frequency, whereby free os 62',-open into one and the same recess, as 59. Thus, cillation of the masses is generated. In this modi?cation, the valve body is adapted to effect communication be 45 the recesses 59a and 60a of the valve body 56 of the rotary valve 54 (see Fig. 2) may be omitted, so that the tween two pipes over one of their branches, as between supply line 52 and the return line 53 and conduit 44 will register in the area of the recesses 59 and 60. The piston 42 and the cylinder 41 will be driven in opposite axial lishes communication between two pairs of pipes, as be tween 61 and 62 and between 61a and 62a‘, that is also 50 directions upon the admission of ?uid under pressure to the cylinder at one side of the piston. between each of the conduits 43 and 44 and one of the In place of the axially movable cylinder 41, it is lines 52 and 53. In the position of the valve body, as 61 and 62 over 61’ and 62’. Actually, in any of the operating positions of the valve body, the latter estab illustrated, the supply line 52 is shown to communicate possible to substitute two ?xed cylinders having pistons slidable therein and connected to the basket 11 and the over pipes 614: and 6211 With the conduit 43, while the conduit 44 communicates over pipes 62 and 61 with the 55 balancing mass 31, respectively, while the supplying of ?uid under pressure to such ?xed cylinders is controlled. return line 53. With the valve body rotationally dis in order to provide for the desired oscillation of the basket, placed by approximately one hundred and eighty degrees, and balancing mass in opposite directions. . the supply line 52 will communicate with the conduit ‘ Furthermore, the single rotary valve 54 described above 44 over the pipe 61a, using the opposite branch of the latter, and the pipe 62, using the branch 62", and the 60 and employed for controlling the connection of the conduit 43 will communicate with the return line using the opposite branches of pipes 62a and 61. It will be apparent that the variable speed motor in changing the rotational speed of the valve body will correspondingly vary the frequency at which 53, conduits 43 and 44 to the lines 52 and 53 may be ob viously replaced by cam-controlled valves or by electri cally or hydraulically-controled valves. It is also apparent that the rotatabe body 56 of distributing valve 54 may the 65 be driven by a variable speed transmission from the motor 28, rather than by a separate variable speed motor 55, as conduits 43 and 44 are alternately communicated with illustrated in the drawing. ' the supply line 52 and the return line 53, thereby to In the case of cam-controlled valves instead of the correspondingly vary the frequency of the oscillations rotary distributing valve 54, a spring-loaded disc valve imparted to the basket 11 and the balancing mass 31. 70 similar to those used in internal combustion engines with In order to permit adjustment of the amplitude of the a stem sliding by means of a cam follower on eccentric oscillations imparted to the basket 11 and the balancing discs is arranged between each pair of coordinated ends mass 31, an adjustable throttling valve 64 may be inter of the pipes 61, 62, 61a and 62a. The eccentric discs are posed in the supply line 52. 55, 56, Further, a pressure accu mounted on the shaft 57 driven by the motor 55. There mulator 65 may also be interposed in the supply line 75 are two pairs of such eccentric discs, but the two pairs are 2,872,045 angularly displaced with respect to eachother by 180° so that when one pair of thervalves is_ lifted the supply 8 the frequency of oscillation of said basket and balancing mass. 7. An oscillating centrifuge as in claim 6; wherein said'means for supplying ?uid under pressure further in cludes pressure accumulating means interposed in said supply line and operative to absorb pressure shocks dur ing operation of said pump means. rotary valve 54. . 8.‘ An oscillating centrifuge as in claim 6; wherein Although a single illustrativeembodiment- of ‘the in said means for supplying ?uid under pressure further in vention has been described herein .with referenceto the accompanying drawings, and several modi?cations of-the 10 cludes an adjustable throttling valve interposed in said supply line and operative to control the flow of ?uid illustrated arrangement have additionally been described, under pressure through said supply line and, hence, to it is to be noted that the invention-is. not limited to the control the amplitude of the oppositely directed oscilla~ precise embodiments illustratedand'descfibed, and. that tions imparted to said basket and balancing mass. many other changes and other modi?cations .may'be ef 9. An oscillating centrifuge as in claim 5; further com fected without departing from the. scope or spirit of the promising a hollow, open-ended shaft, bearing means ro invention, except as' defined in theappended'claims. tatably mounting said hollow shaft in said frame coaxial 3What is claimed is: with said axis for rotation of said basket, a spindle ex 1. An oscillating centrifuge 'for eifectingi‘the continuous tending axially from said. basket and slidably received in discharge of dried solid materials and comprising a ‘frame, a basket mounted in said frame for rotation and for 20 said hollow. shaft, .means constraining said spindle to rotate with said hollow shaft while permitting axial os oscillation along the axis of rotation of ‘the basket, a cillation of said spindle relative to said hollow shaft, balancing mass mounted for oscillation along said axis of said balancing mass being slidably mounted on said h0l— rotation and being elastically coupled with said basket to low shaft, means constraining said balancing mass to form, with the latter, a dual-mass oscillating system, drive means operatingin opposed axial directions on said basket 25 rotate with said hollow shaft, rotational drive means, and transmission means connected between said rotational and balancing mass, respectively, and elastic means cou line 52 is connected with the conduit 43, whilethe con duit. 44 is connected with the return line 53. The con nections are reversed when the other pair of valves is lifted. Thus, the same effect :is insured as with the pling said basket and said balancing mass, respectively, to said frame in opposed-directions so that forces trans mitted from said dual-mass oscillating system to said frame act simultaneously in opposite directions to prac tically eliminate the oscillation of said frame. 2. An oscillating centrifuge as in claim 1; wherein said drive means includes a single generating device for pro— ducing oscillations of both-said basket and said balancing mass. 3. An oscillating centrifuge as in claim '2; wherein said drive means further includes coupling means between ssiidgeneratihg device and said basket and balancing mass, respectively, operative to cause said basket ‘and balancing drive-means and said hollow shaft to rotate the latter and thereby to effect simultaneous rotation of said basket with said spindle and of said'balancing mass. 10. An oscillating centrifuge as in claim 9; wherein said spindle is directly connected to said cylinder and thereby forms said-coupling means between said cylinder and said basket. ‘11. An oscillating centrifuge as in claim 10; wherein said spindle has a hollow portion opening axially in the direction-toward said cylinder and said hollow shaft and said hollowportion of the spindle have registering axially elongated slots; and wherein said coupling means be tween said piston and said balancing mass includes a rod - mass to oscillate synchronously in opposite directions at 40 connected to said piston and extending axially out of all operating frequencies. 4. An oscillating centrifuge as in claim 3; wherein said generating device is ?uid pressure operated; and said drive means further includes means for supplying an operating ?uid to said generating device at repeatedly varying pres sures, and adjustable control :means effective to vary the frequency of the variation of pressure of the operating ?uid. 5. An oscillating centrifuge as‘in claim ‘3; wherein said generating device includes a cylinder slidably mounted in said frame to move axially relative to the latter in the direction of said axis of rotation ofthe basket, and a piston axially movable within said cylinder, said coupling means connecting said basket to said cylinder and said balancing mass to said piston; and further comprising means for supplying ?uid under pressure to said cylinder alternately at the opposite sides of said piston so that, in response ‘to the admittance of ?uid under pressure to said cylinder, said cylinder and‘piston, and hence said basket and balancing mass, respectively, are displaced in op posite directions. 6. An oscillating centrifuge as in claim 5; wherein said means for supplying ?uid under pressure includes conduits opening into the opposite ends of said cylinder, a source of ?uid, pump means having an inlet receiving ?uid from said cylinder into said hollow portion of the spindle, and a cross-piece on said rod projecting radially through said registering slots and secured, at its ends, to said bal ancingrn'ass to transmit the axial displacements of said rod with the piston to said balancing mass and to de?ne said means constraining said balancing mass to rotate with said hollow shaft. 12. An oscillating centrifuge as in claim 10; wherein said hollow shaft has axially elongated slots therein, and said means constraining said spindle to rotate with said hollow shaft includes a pin extending diametrically through said spindle and having its opposite end por tions slidably received in said elongated slots. 13. _An oscillating centrifuge as in claim 12; further comprising a sleeve slidable on said hollow shaft and connected to said pin to move axially with said spindle relative to said hollow shaft, and elastic intermediary means on said hollow shaft between said sleeve and said balancing mass to provide the elastic coupling between (if) the latter and said basket. 14. An oscillating centrifuge as in claim 13; wherein said intermediary elastic means includes a helical com pression spring extending around said hollow shaft. 15. An oscillating centrifuge as in claim 13; wherein said intermediary elastic means includes an axially com said source and a discharge for ?uid under pressure, a pressible cylinder assembly containing ?uid to yieldably ?uid under pressure supply line extending from said dis charge of the pump means, a return line extending back resist axial compression thereof. to said source, valve means connected to said conduits and'to said‘ supply and return lines and operative, upon actuation, to alternately communicate said supply and re turn lines with said conduits, and independent, variable speed motor means connected to said valve-means for driving the latter at an adjustable speed, thereby to vary _ 16. An oscillating centrifuge as in claim 13; wherein said frame has spaced apart laterally extending wall por tions carrying said bearing means mounting the hollow shaft, with said sleeve and balancing mass being both disposed between said wall portions; and wherein addi tionalelastic means includes an elastic element inter posed between said sleeve and the adjacent wall por 2,872,045 tion and an elastic element interposed between said bal~ ancing mass and other of said wall portions. 17. An oscillating centrifuge as in claim 14; wherein each of said elastic elements includes a helical compres sion spring extending around said hollow shaft. 18. An oscillating centrifuge as in claim 14; wherein 10 19. An oscillating centrifuge as in claim 3; wherein said balancing mass is .in the form of a second basket so that, in response to the synchronous oscillation of said second basket and the ?rst mentioned basket in op 5 posite directions, dried solid materials are simultaneously and continuously discharged from both baskets. each of said elastic elements includes an axially compres sible cylinder assembly containing ?uid to yieldably resist axial compression thereof. No references cited.