Патент USA US2403513код для вставки
July 9, 1946‘ E. A. .F-ORS-BERG 2,403,513 DEVICE'FOR DETERMINING THE bEFLgcTIoN 0F ROTATING BODIES Filed‘Sept'. 21,, 1-943 2 Sheets-Sheet 1 // ' mam/m? W/ 711/566‘: ’ mwaz. s55rage/y I . 52%,4dyqgy July 9,1946. E.IA.‘FORSBERVG'I ‘ ‘ 2,403,513 _ DEVICE FOR DETERMINING THE DEFLECTIQN OF ROTATING BODIES Filed Sept‘. 21, 1943 2 ‘Sheets-Sheet 2 (Jil n \ Patented July 9, 1946 2,403,513 UNITED ‘STATES PATENT OFFICE 2,403,513 DEVICE FOR DETERMHVING THE DEFLEC TION OF ROTATING BODIES ErikAugust Forsberg, Nockeby, Sweden, assignor to Aktiebolaget Separator, Stockholm, Sweden, a corporation of Sweden ‘Application September 21, 1943, Serial No. 503,209 In Sweden October .8, 1942 2 Claims. 1 .For various purposes, for instance in the bal ancing ofrapidly rotating bodies, it is important . (Cl. 73-—66) , 2 > any other point of the body I or ofyany part rotatable therewith. to be able .to determine, with regard to their mag The magnitude of the de?ection is calculated nitude and preferably also to their position, the in' linear measure from the middle position; deviations which, during rotation, are carried. out 5 the position of the de?ection in angular measure by'the. body from its position of equilibrium, or from any ?xed point of the body I, ‘ ' what is called the deflection of the body. The For determining the magnitude of the de?ec present invention has for its object to enable a tion a radially displaceable organ provided with quick and exact measuring of such de?ections. a measuring device, for instance a micrometer Fig. 1 is a diagrammatic side view of a body 10 screw II, is used. The body I and the measuring mounted on a spindle associated withde?ection element II are spaced from each other andeach determining means. connected to one of the poles of an electricity Fig. 2 is .a detail sectional View through shaft source I2,_suitably for direct current. At the ~2,- showing a top view of elements I5 and I‘! measuring the element llyislmoved radially in of Fig. 1, with contact I5 on element I7. 15 wards towards the body I until these parts come ‘Fig. 3 is .a vertical section of an element to be into contact with each other at that moment balanced, mounted for de?ection in any direction when the deviation of the body I is directed and showing auxiliary elements useful in deter towards the element I I. In the electric circuit mining the de?ection. a series of short impulses will then occur, which Fig. 4 is a vertical section similar to Fig. 3 20 should be observed in any suitable way; For of an alternative arrangement. this purpose a telephone receiver may be used, Figs. 5 and 6 show alternative methods for producing a tone ofa frequency equal to the determining the amplitude of de?ection. number of revolutions of the body, or advantage The body I may be assumed to be secured to ously a galvanometer I3. In any case it may a shaft 2, which can swing about the point 3. 25 be of‘ advantage to amplify the current impulses If the body I is a centrifugal bowl, the shaft, in a manner known per se by means of an ampli between the body and the point 3, may be sup ?er I4. ported by a radially elastic bearing, which is The position of the measuring element I I at not shown, since it is well known in the art. a de?ection equal to 0, i. c. with a body standing If there are no disturbing forces and if the body still in the middle position or with an exactly I is mass-symmetric about the shaft 2, the latter balanced body, is determined and advanta will lie still in space and take up the position geously set to 0. The position of the element II 3-4. The body will then occupy the position relative to this zero-position at the moment when shown, in full lines and no de?ections will take place. 0n the contrary, if the body is not mass- I’ current impulses at ?rst occur, obviously indi cates the magnitude of the de?ection. The point symmetric about the shaft 2, the latter will de of the element II should be made of a hard scribe a conic surface having’ its pointed end at material not readily oxidable in order to prevent the point 3 and will thus take up the positions rapid change of the zero-position by wear. It 5 and 6 at intervals of half a turn, the body I may also be suitable to make the point elastic thereby occupying the positions 1 and 8. At the to a certain degree. top-side of the body I there will then be the For determining the position of the de?ection de?ection 9 and at its bottom side a de?ection a special device is used for connecting the electric Ill. The de?ection may also be referred to the line to the rotating system. The current is led shaft or any other part connected to the body in series through a stationary ring 22, a ring or the shaft. It should be observed that the 45 23 supported thereby and revoluble therein, an arm 24 and a lever 25, to a piece I5, which, by manner in which the body is maintained in ro-v movement of lever 25, may be made to contact tation and the way in which the shaft is sup or clear an element I6 taking part in the rota ported is of no importance, since while these tion. In order to avoid vibrations at the con factors may have an in?uence on the interpreta 50 tacting surface, this is advantageously formed tion of the de?ections, they do not affect the as a sector of a sphere having the point 3 as determination of the same, which latter is the its centre. The element I ii is electrically con sole object of this invention. ductive and electrically connected to the rest of Thus the purpose is to determine the de?ection the rotating system, but is provided with an in— 9 and/or the deflection II), or the de?ection at 55 sulated section I‘! as indicated in Fig. 2. The 2,403,513 3 4 the shaft 2 and the body I are maintained in said element should be connected for rotation in synchronism with the body I and always in unchangeable position relative to each other. such a way that thesection I1 has a known body I with special measuring elements which position relative to the ?xed point of the body to which the position of the de?ection is re ferred; the section I1 and the ?xed point should advantageously be arranged in the same radial It is in many cases preferable to provide the are placed on the body I in such a manner that their symmetry-axis coincides with the axis whose de?ection is to be measured. If, as is often the case with separator bowls, plane. The contacting piece I5 is supported in the body I is provided with a central hole, meas such a way that it can be turned around the 10 uring elements I9, 20 as shown in Fig. 3, could shaft 2 and that its position can be read off. be inserted in the hole at one or both ends. Or One of the rings 22 and 23 may be provided the body may be placed in a casing 2|, Fig. 4, with a pointer and the other with a graduated concentric with the body I, and against which scale. If, at the moment when the body I is the measuring is carried out. contacting with the element II, the piece I5 Such measuring elements (and perhaps in par contacts with the element I6 at a point other ticular cases the body I itself) may be so ar than the insulated section H, the circuit is closed ranged that automatic adjustment to zero is and a current that de?ects the galvanometer obtained. Fig. 5 shows the principle hereof. I ?ows. If the contacting piece I5 is now turned assume that a measuring element 22 has been around the shaft 2 until it touches the section placed on the body in one way or other. The 2.0 I‘! at the contacting moment, no current can pass element is in the .form of a ring, concentric and the deflection of the pointer ceases. Thus, with the axis of the body. (If any part of the the position of the contacting piece I5 when the body itself is shaped in this way and in other de?ection of the pointer ceases shows the posi_ respects suitable for measuring according to this tion of the de?ection. If the device is so ad method, the measuring element 22 could of justed that the section I1 and the fixed point 25 course be dispensed with.) The measuring ele lie-at the same axial plane, and the de?ection ment III] is here double-sided, so that the meas of the galvanometer pointer ceases when the uring can be carried out by moving it either contacting piece I5 occupies the position shown inwards or outwards. When the measuring is in Fig. 2, it is obvious that the de?ection of the made, the element III] is ?rst moved in the one body I amounts to the angle a from the ?xed direction, for instance inwards, until it contacts point, reckoned in the direction of the move with auxiliary element 22. The position of the element III] is observed; for the sake of con ment. It may, however, happen incidentally that the venience the scale may here be adjusted to zero.‘ contacting piece I5 is in the right position al Then the measuring element III) is pushed in ready at the beginning. No deflection of the 35 the opposite direction until it contacts again. galvanometer pointer I3 will then take place, and there is thus a risk that the measuring element II is screwed too far inwards and may get damaged by too heavy blows against the-body I. To avoid this the contact between the ele ments I5 and It may be coupled in parallel with a switch I8, which in the ?gure is shown connected to the point 3, .but it will be under stood that it may be coupled to any other point of the rotating system, for instance to the lower side of the element I6. At the beginning of the measuring the switch I8 is kept closed, and con If the displacement required, which is indicated by the measuring element III], is s, the distance between the two contacting surfaces of the measuring element III! is a, and the thickness of the ring 22 is b, the magnitude of the de?ec tion is obviously =1/2 (a-b-s). The deviation is thus determined without hav ing to carry out adjustment relative to the body I in its position of rest. * The same principle may be used with the shaft itself, or with an auxiliary measuring element placed centrally as shown in Fig. 3-—or even with sequently the current can pass thru as soon the body itself—-by measuring on both sides, as as the body I and measuring element II con 50 indicated in Fig. 6. If the diameter of the aux tact, even if at that moment the contacting iliary element (the shaft or the body) is d, then piece I5 happens to be at the section I'I. As the de?ection is =1/2 (a—d—-s) . soon as the pointer of the galvanometer I3 de What I claim and desire to protect by Letters ?ects, the switch is opened and-if required the contacting piece is turned until the de?ection 55 of the pointer ceases. The measuring is now Patent is: ' 1. Means for measuring the deflection of a rotating body supported on the outer end of a completed. shaft, a radially adjustable element adapted to It is also possible ‘to make the element It be adjusted radially with relation to the rotat insulated and to have the section I‘! in electric ing body to make electrical contact with the connection with the rotating system. In such 60 rotating body after de?ection, an element rotat a case the de?ection of the galvanometer pointer able with thebody having an electrical contact will usually cease when the switch I8 is opened, portion and an insulated portion, an electrical and will appear again when the contacting piece contact member adapted to engage the element I '5 stands in the right position. rotating with the body, said electrical contact If it is desirable to carry out the measuring 65 member being adapted to be shifted about the at different axial heights, either two or more axis of the shaft over the face of said rotating measuring elements II may be used, or the ele element, and an electric circuit having in series ment I I may be axially adjustable. 7 a source of current,jthe body, the element ro It has been assumed above that the measur tatable therewith, the electric contact member, ing is carried out against the body I itself. The the radially adjustable element and an indicating body I is, however, often by reason of its shape 70 instrument. > V or the nature of its surface unsuitable for this 2. Means for \measuringthe de?ection of a purpose, and there may also be other reasons rotating body supported on the outerend of for effecting the measuring otherwise. The a vertical shaft which can be swung about the simplest way is then to measure against'the lower‘ end thereof, a radially. adjustable element shaft 2 which, however, can be done only if 75 2,403,513 adapted to be adjusted radially with relation to the rotating body to make electrical contact with the rotating body after de?ection, an element being adapted to be shifted about the axis of the shaft over the face of said rotating element, rotatable with the body formed as a sector of a of current, the body, the element rotatable there sphere having an electrical contact portion and an insulated portion Whose center is located at the other end of the shaft, an electrical contact member adapted to engage the element rotating with the body, said electrical contact member and an electric circuit having in series a source with, the electric contact member, the, radially adjustable element and an indicating instru ment. ERIK AUGUST FORSBERG.