USRE19817E - Electromagnetic vibrating - Google Patents

Description

H. E. WURZBACH 1=:r AL Re- 19,817 ELECTROMAGNETIC VIBR ATING APPARATUS Jan. 7, 1936.

Original File d July 1,1932 2 Sheets-Sheet 1 Jan. 7, 1936.

H. E. WURZBACH ET AL ELECTROMAGNETIC VIBRATiNG APPARATUS Original Filed July I, 1952 2 Sheets-Sheet 2 v A. C. or

0. CZSII /y 5O Y a INVENTORS. Ivy/z ET Ww'zbadb By Clfo'e Ejfanold,

L W W R EYS.

' the respective electromagnetic devices of each electromagnetic means.

Reiuued Jan. 7, 1936 ELECTROMAGNETIC VIBBATING APPARATUS Hugh E. Wurzbach and Clyde 1!. Konold, Magna, Utah Original No. 1,945,015, dated January 30, 1934, Serial No. 620,340, July 1, 1932. Reissue No. 19,816, dated January 7, 1936, Serial No. 29,366, July 1, 1935. Divided and this application for reissue October 7, 1935, Serial No. 43,992

-2 Claims. (Cl. 172126) This invention relates to an improvement in have been made in which electromagnets are used electrically operated vibrating apparatus adapted to attract armatures attached to the operated for use in operating various vibrating devices vibrating member which is supported on resilsuch as screens, grizzlies, feeders, conveyors, froth lent means but such devices have heretofore debreakers, etc. pended on the use of strong resilient devices such The main object of the invention is to proas steel bars or coil springs which give a kick vide means for operating a vibrating device by or vibration to the. operated member when repositive electromagnetic action in both direcleased by the electromagnets so that, for extions of the vibrating movement thereby obtainample, the electromagnets provide the power for ing a more efiective and positive action than is the stroke in one direction and the springs propossible where the vibrating movement in one divide the power for the stroke in the opposite direction is efiected by electromagnetic means and rection. These resilient devices or springs must the movement in the opposite direction is effected be strong and still so as to cause the operated by resilient means operating in opposition to the member to have a quick snap when released from the electromagnets and therefore the power required to deflect them is higher than is necessary if both directions of movement are effected by electromagnetic power. With our apparatus the A further object of the invention is to obtain economies in construction and operation by dispensing with resilient return means operating in Opposition o e elec roma ne ic Operating resilient support for the operated means is not means depended upon to effect the return movement of A further Object offlie invention is t P ov de said means and a relatively light resilient supfor electromagnetic operation of vibrating deportin means may therefore be used. vi es by ny el ri l pow r system without th Yielding or resilient stop members, such as id n req n y n r motor s n rubber bumpers, are also preferably provided for tor s o rotary ers for chan ing the limiting the movement of the operated member v q cy or shape of the current wave in each direction by-the respective electrom 111 the pp y circuit. netic devices.

The apparatus comprises electromagnetic op- Th accompanying drawings illustrate the inerating means including one or more electromagr vention and-referring thereto: netic units each of which comprises two elec- Fig. 1 is a side elevation of the electromagnetic 1 tromagnetic devices operating in opposite direcvibrating means;

tions upon the operated member or means, and Fig, 2 is a section on line 2! in Fig. 1;

circuit connections for alternately energizing said Fig. 3 is a diagram showing the electrical operelectromagnetic devices. According to a preating connections for the electromagnetic viferred embodiment of the invention, means are brating means; provided for energizing said devices from an al- Fig. 4 is a graph of an alternating current ternating current circuit, in such manner that wave illustrating the'selection of rectified half waves for distribution to the respective members operating unit are energized alternately by alter or the electromagnetic vibrating unit; nate half waves of the alternating current. For this purpose suitable rectifying means are included in the connections from the alternating current circuit to the respective electromagnetic devices in such manner that half waves in one direction are conducted to one electromagnetic device and the half waves in the opposite direc tion are conducted to the other electromagnetic device, so that the said two electromagnetic devices operate alternately on suitable armature means connected to the operated members to effect positive vibration thereof. The operated member is preferably resiliently supported to enable it to take up the vibrations imparted thereto by the said electromagnetic means.

Electromagneticaily operated vibratory devices ical rectifying apparatus which may be used for magnetic units;

Fig. 6 is a diagrammatic showing of an alternative mechanical rectifljer arrangement which may be used for alternate energization of the respective electromagnetic units from an A. C. or D. C. energy supply;

- generator arrangement whereby any desired frequency of alternate energization of the electromagnetic units may be obtained.

Our invention may be applied to operation of any vibrating means such as a screen, conveyor,

- feed box et cetera; The operated vibrating Fig. is a diagrammatic showing of a mechanalternate energization of the respective electro- Fig. 7 is a diagrammatic showing of a motor-- 'brating means I by a cross bar' 5.

- indicated at I in Figs. 1 and 2 is shown as resiliently mounted on a supporting means or frame, for example, by means of two parallel elongated rigid vibratory members 2, such as bars of steel or other suitable material disposed at the respective sides of the supporting frame, resiliently mounted on supports 1 and I in any suitable manner, for resilient vibratory movement in a direction transverse to the length thereof.- The bars 2 are shown connected to the operated vi- It will be understood that the member I' may be mounted to vibrate in vertical, inclined or horizontal directions, according to the specific application of the same.

The resilient supporting means may comprise springs 28 and 39 mounted on the supports I and 9 at opposite sides of the central portion of said bars 2 and resiliently engaging said bars. Rubber stops or bumpers 40 and H may be provided if,

desired, positioned on the frame members I and 8 to engage the vibratory members 2 at opposite armature means of the electromagnetic operating means hereinafter described, so as to limit.

the vibratory movement of said members. and the member I carried'thereby. If desired, the supporting springs 38 and 39 may be omitted and the rubber bumpers 40 and H may be adjusted to normally engage the vibratory members 2 and to resiliently support the same while at the same time limiting their vibratory movement by reason of the limited compressibility of the rubber members. Any suitable means may be provided for securing the vibratory members 2 against lateral or longitudinal displacement in a direction perpendicular to the direction of vibratory movement thereof, 'while permitting such vibratory movement. For this purpose, positioning members such as rods 41 may be provided extending slidabiy through the members 2 and secured to the supporting frame members I and 9. Said positioning members may extend centrally within the bumper members 49 and H, as shown, or within the springs 28 and 39, or at any other suitable positions.

The electromagnetic operating means for the member I are shown mounted on the supports 1 and 8 and may comprise an electromagnetic unit at each side of the device, each unit comprising an electromagnet Ill mounted on the support I, an electromagnet II mounted on support 8, and separate armature means I2 and I! for the respective electromagnets, secured to the intermediate portion of the vibratory bars 2 at the corresponding side of the member I or other- -wise connected to said member I to impart vi bration thereto, the armature m'eans I2 and II of each unit being mounted at the opposite sides of the correspondingbar in the plane of vibration thereof. The core members and armatures for the respective electromagnets are preferably made of laminated soft iron to enable them to operate on rapidlyintermittent current without objectionable lag or production of eddy currents. The armatures, being of soft iron, except for the momentary polarization due to the influence of the associated electromagnets, are not magnetically polarized, and are not provided with electric windings or coils for self-energization or selfpolarization. The term armature" as used herein and in the appended claims, will be understood to mean a non-polarized, non-energized armature of this type. The respective electro.

bration penunit of power.

magnets I II and II of each unit and their armture means I2 and II are so disposed asto cause the respective armatures to be attracteclin opposite directions upon energization of the respective electromagnets. For this purpose, each armature I2 is shown as mounted above or at one side of the corresponding vibratory member 2, and the electromagnet III therefor is mounted above or at the same side of said armature so as to attract the same upwardly or in a direction 10 toward said one side, while each armature I! is mounted below or at the other side of said member 2, and the corresponding electromagnet II is mounted below or at the other side of said armature so as to attract the same downwardly 1 or in a direction toward said other side.

In Fig. 3, there is shown a wiring-diagram for the electromagnetic unit at one sideof the device only, it being understood that the other electromagnetic unit may be similarly connected.

The coils or windings II of electromagnet III are connected by electrical connections II and II to alternating current supply lines I9 and 2i] which may be ordinary service lines of usual commercial frequency. One of these connections, for 3; example connection I'I, includes a suitable rectifying means or electric check valve 2i, such as a copper oxide or thermionic tube rectifier, which operates to permit passage of a current impulse or half wave in one direction but to prevent the a passage of a current impulse or half wave in the opposite direction. The windings or coils it of electromagnet II are also shown as connected to the same servicelines I9 and 20 by electrical connections 22 and 23 one of which includes a rectia: fying means 24 which is adapted to permit passage of current impulses or half waves which are in opposite direction to the impulses transmitted through the rectifying means 2i. The operation of these rectifying units 2| and 24 is illustrated 41 diagrammatically in Fig. 4 wherein the curve b-b is the graph of an alternating current, the positive half waves being shown above the horizontal line a-a, representing zero current, and the negative half waves belowthat line in the 4 usual manner, and the positive half waves being transmitted through connections I! and I8 and rectifier 2| to the coil l5 whereas the negative half waves are transmitted through connection 22 and 28 and rectifier 24 to the coil Ii. 5

The rectifiers 2i and 24 may be of any suitable type. We have used the so-called copper-oxide rectifiers in practical operation with successful results.

The bumpers or stops 40 and 4| may be ad- Justed, if necessary, by suitable means such as shown at 29. The main function of these bumpers or stops is to limit or stop the travel of the armatures in either direction before they strike the magnet pole pieces in order to prevent injury to the laminations. These stops or bumpers also tend to impart accelerating impulses to the armatures or vibrating members when released by the diminution of current in the energizing coils I! or I8, as the case may be. The stops or bumpers 40 and H may be of rubber or any other suitable yielding or resilient material, and may if desired be dispensed with, but in that case the resilient supporting means 38 and 39 must be made heavier, with the result that the construction is less resilient and will give correspondingly less vi- The stopsmay be normally incontact with the vibratory members 2, or they may be slightly spaced from the same, as may be desired.

The energizing circuit may be a. single phase or available frequency, for example 25 to 60 cycles per second, these being the frequencies ordinarily used in commercial lines. Suitable switch means It will be provided controlling connection benetic means above described; also suitable adjustable resistances 32, or impedances, autotransformers or other devices may be included in the circuit connections for controlling or regulating the intensity of the current supply, to cor respondingly control or regulate .the operation of the apparatus.

supplied to the electromagnetic devices from the supply lines I! and 20 is controlled by the rectifiers 2| and 24 in such manner that the positive impulses or half waves of currentwill be allowed to pass through rectifier II to the winding IE but will be prevented by rectifier 26 from passing through rectifier ii to coil l6; whereas the negative impulses or half waves alternating with the positive impulses or half waves will be permitted to pass through rectifier 24 to coil I but will be prevented by rectifier II from passing to coil it. As the positive or negative impulses or half waves successively alternate or succeed one another in the operation of the alternating current, the windings i5 and I6 alternately energize electromagnets II and ii which operate upon the armatures i2 and II to produce the rapid reciprocation or vibration of the members 2 and of the member 8 connected thereto.

Any suitable means may be used for applying energizing current alternately to the two electromagnets of the operating units, "for example, we can use instead of a copper-oxide rectifier any other form of electrical check valve such as a thermionic tube or electronic rectifier or a mechanical rectifier consisting of a rotating timer driven by a synchronous motor operated from the alternating current supply circuit; or if suitable alternating current power is not available, direct current can be used by passing it through a combinat'lon timer and interrupter so as to produce pulsating current and deliver the successive pulsations alternately. first to one set of coils and then to the opposite set of coils repeatedly.

for any reason.

In Figs. 5 to 'l we have shown several modifications of the energizing circuit hook-up and referring particularly to Fig. 5, a half-speed synchronous motor ii is shown operatively connected to a rotatable commutating switch I provided alternating current supply circuit of any suitable tween the energizing circuit and the electromag- In the operation of the apparatus the current While we prefer to connect the apparatus di-.

mechanism at increased speed for short periods with suitable connection to alternating current energy supply lines 53 and 54 and arranged to deliver successive half-waves alternately to the respective electro-magnet windings l5 and l6.

The arrangement shown in Fig. 6 may be used 5 either with a source of alternating current energy supply or a source of direct current energy supply, the energy supply lines being designated at and 66. In case the supply lines 65 and 56 provide alternating current of the desired frequency, 10 the motor 61 operating the switch means 58 may be a full-speed synchronous motor and this arrangement will provide for delivery of successive half-waves to the windings i6 and ii in the same manner as described in connection with Fig. 5. If the supply lines 55 and 66 provide a source of direct current energy, the motor 61 may be of any suitable type, and will serve to periodically connect first one and then the other of the windings l5 and ii to the source of energy.

, In Fig. 'l we have shown an arrangement in which a motor 69 is connected to the supply lines 60 and ii of either an A. C. or D. C. supply circuit, and operates to drive an alternator 62 whose leads 68 and N are connected to the windings I5 26 and I6 through the use of. associated copper oxide or thermionic tube rectifiers II and N respectively, in the same manner as shown in Figs.

3 and 4. This arrangement is useful where the respective windings are to be energized at a fre- I0 quencydiiferent from the frequency existing in the supply lines 60 and ii or to utilize a direct current supply to drive an alternating current supply means, in which case the leads 63 and N become energy supply lines comparable to those I shown at I! and in Fig. 3.

This application is a division of our co-pending application. Serial No. 29,366 for reissue of Patent'No. 1,945,015.

- We claim:

1. A vibratory apparatus comprising: a frame structure; an elongated rigid vibratory member resiliently disposed on said frame structure and adapted for vibratory motion in a direction transverse to the length thereof, said vibratory memher being resiliently engaged by resilient supporting means. secured to said frame structure at opposite sides of the central portion of said vibratory member; two separate non-polarized armature means mounted on the central portion of said member; a. pair of electromagnets secured to said frame and operatively associated with the respective armature means and acting oppositely thereon in saiddirection of vibration; and means for alternately supplying unidirectional electrical energy to the respective electromagnets.

2. The invention set forth in claim 1. and comprising in addition: resilient stops positioned on said frame for engagement with said vibratory member at opposite sides of said member in the 00 direction of vibration thereof at positions removed from said armature means longitudinally of said member.

HUGH E. WURZBACH.

CLYDE H. KONOLD. 05

Images