CA1149247A - Vibrator - Google Patents

Abstract

A b s t r a c t o f t h e D i s c l o s u r e A vibrator actuated by means of a fluid medium under pressure is order to impart vibrations to a working platform carrying the material being treated, said vibrator comprising a base. Said bass on the side of the working platform is provided with a resilient cup made as a closed loop with at least one discharge opening having a resilient edge perform-ing vibratory motion under the effect of the fluid medium and designed to impart vibrations to the working plat-form. Arranged on the cup on the side of the working platform is a percussion body cooperating with the working platform upon the cup vibrations under the effect of the fluid medium and imparting impact vibrations to said working platform;
The vibrator has a simple and reliable structure per-mitting of imparting powerful impact pulses to the working platform.

Description

1149~1L7 ~ he present in~ention rela-tes to vibra~ors utilizing ~or their operation a ~luid medium, in particular9 compres-sed air. Such vibrators are used, for instance, for driving ~ibratio~ conveying devices such as jigging con-veyers and vibratory feeders designed for discharging bulk materials ~rom and chargi~g them into the ~arious receptacles through hatches and the like.
The known jigging conveyers and vibratory ~eeders have a working platform mounted o~ the ground, ~rame;
in supports or suspended horizontally or at an angle o~ up to 20 to t~e horizontal. ~he ~ibrator is mounted below the vibrati~g plat~orm on the Oround or directly o~ the platform. ~he vibrator is positioned approximatelg in ~he middle o~ the ~ibrati~g plat~orm or at one o~
the ends of the latter. ~he vibrator acts to i~part vibrations to the vibrating ;platform in a direction perpendicular to its sur~ace or at an angle o~ 30 thexeto.
One e~d of the vibrating plat~orm is located under t~e discharge hopper and the other e~d - at the poi~t where bulk materials are loaded i~to con~eying mea~s (dump cars, automobiles etc.).
In vibration conveying devices use is most ~re~uent-ly made o~ unbalance vibrators (c~ .S.R.Inventor's Certificate ~o. 275,835, cl. 81E, 51) ~ith an electricg pneumatic or h~draulic rotation mo-tor. Such an unbalance vibrator comprises unbalance bobs (weights) xigidly ~i~ed on the motor shiaft or on the vibrator's ow~ shaft. 1~
the latter case, the shaft rotates in bearin~s mounted on a plate. In order to ob-tai~ directed vibrations, two sha~ts with unbalance bobs are to be set in par~llel a~d ro~ated by means of a gear drive in opposite directions such that the unbala~ce bobs should rotate in phase oppo-sitio~.
The motor is usually mounted directly on the ~ibra-- tor plate or on a separate stationary base, and the ~otor sha~t is connected with the unbalance sha~t via ~le~ible sha~t, Cardan drive and the like.
Such vibrators create shock-~ree alternati~g sinus oidal lcads whic~ i~pi~rt vibrator~ motion to the vibrati~g plat~orm, resultinæ i~ the dLspla¢ement of bulk material.
~he diisadvantages of thl3 me~tioned vibrators are the complexity o~ desig~ heiavy weight and low reliabilit~
i~ operatio~ i~ dust-lade~, abrasive and a~j~ressive ~edi~, ~or example 9 under co~ditions o~ a mi~e. Besides, such ~ibrator~ iare ~ot provided wit~ means for au~omatic matc~lng of the dlsturbiDg force with the actual vibra-tions o~ the vibrating platfor~, which results in a vibrator o~erload. While so doing, the electric motor often operates i~ the start-up mode or "stalls". Such a mode of operation i~ combinatio~ with hig~ vibratory - _3 ~14g~4~.
loads causes a premature failure of the electric motor.
In order to reduce the e~ect of the a~ore~ ted factors, one has to increase the power o~ the rotation ~otor. ~his, however, causes a~ overload o~ the unbalance shaft bea-ri~gs and their rapid ~ailure. ~he bearin~ overloads occux when the direction of the vibrator exciting force does not coincide with that o~ actual vibratiO~ o~ the vibra-tin~ pl~tform.
~eumatic and hydraulic rotatiorL motor~ alw~ys lo include a costly precision kinematic pair such as rotor-~-stator, piston-cylirLder9 gear wheels. In order to protect such a pair from rapid wear, provision should be made for a t~orough puri~ication of the exlergy carri~r such as air, contirLuous supply Or lubrica~t to rriction sur~aces ~rLd u~Linterrupted mairLtena~Lce of said sur~aces. Such mo-tors ~eature a lovl reliability o~ operatio~L in humid, aggressive and dust-laden media, for example, in mines.
For a more e~ficient conveya~ce o~ b~lk matorials, the vibrating platform should be subjected to impact dist~rba~¢es. There are know~ ilL the art piston-type pneumatic or hydraulic percussion vibrators (c~.g ~S.S.R.
I~ventor's Certi~icate No. 340,600~ cl~ B 65 ~ 2?/22) which comprise a body with a cylinder in which a striki~g piston moves, and energy carrier i~let a~d outlet systems T~
is oLten that the ~unctions o~ a distributi~g me~ber ~ 4~ i7 are served by the pi~ton itself, to which e~d special inlet cha~nels and cu-t o~ edges are provided on the piston and in t;he cyli~der. Such vibrators likewise require a thoxough puri~icatio~ o~ the energy carrier and co~-tinuous lubxication of the pisto~ unit, and exhibit poor operating ef~iciency in humid and abrasive media. ~he speed oi the stri~ing piston travel prior to the moment o~ impact u~ually eæceeds 5-6 m/s. ~his has an adverse e~ect on the strength o~ the vibrato~ and vibration conveying device in that it results in the e~ergence and rapid development o~ microcracks in the material of their parts and, subsequently, in their breakdown. In order to reduce the impact speed, one has to increase the piston and cylindex diameter, which is economically unsound. ~he-re appear structural di~ficult;ies in the embodi~e~t o~
energy carrier distribution me~bsr~ due to reduction o~
the pisto~ stroke.
Enown i~ the art are diaphragm-type vibra~ rs (c~., ~.S.S.R. I~vent;or's Certi~icate ~o. 438,793, cl. E 21 13/08) which include a power chamber de~ined by a body and a diaphragm (membrane). ~his diaphragm via i~termediate part af~ects the vibratin~ plat~orm o~ the vibratio~
conveyin~ device. ~he enex~y carrier is o~ten dîstributed with the ~id o~ sllde valve means. ~he slide valve moves 5_ ~ ~ 9 ~ ~

under the e~ect o~ the diaphragm. Such vibrators are free from so~e o~ the afore-mentioned disadvantages.
~hey suffer, however, ~rom difficulties involved in the manufacture o~ the outlet distributingr device in view of the small value o~ the diaphra~m ~ovement~ Slide valve distribution also requires the purification o~
the energy carrier, co~tinuous delivery of lubricant and protection from abrasive particles penetrating ~rom the environment.
Also known is a diaphragm-type vibra~or (c~., U.S.S.R.
I~ventor's Certificate ~o. 249,270, cl. 81 E, 52) ~or driving a vibration conveying device whose working platfor~
is mounted on means permitting o~ its moveme~t in the longitudinal ~irection and is provided with sprin& means ~or return to the initial position. ~he vibrator is provi-ded with a body mounted immovably relative to the worki~gr platform. ~he workingr chamber in the body has one resilient wall made as a diaphragm (membrane) f~xed over the periphery~
~he body accommodates thereinside ~al~e means ~or the in~ection o~ compressed gas to the wor~ingr chamber. ~ixed i~ the ce~tral portion o~ the diaphragm is a rigid rin~ whose opening communicates with the ~vorki~ chamber. Said rin~
has a sealing ~lan~e adjoined by a valve. ~he ring ~oves together with the diaphragm central portion and comes to ~;149~4~

rest against its stroke li~iter provided on the body.
The valve is set on a rod attached to the e~d face of the working plat~orm.
During operation, compressed gas is supplied -to the working chamber via injectio~ means and affects the diaphragm. The diaphragm bulges o~ing to its resilie~ce, its maximum movement being performed i~ the central portion, to~ether with the ri~id ring fixed thereto.
~he rigid ri~g presses ~vith its sealing ~lan~e against lo the valve and, via t~e valve and the rod thereof, transmit~
to tha working platform a ~orce ge~erated in the central portion o~ the diaphra~m. Under the e~fect o~ this force 9 the working plat~orm move~ in the longitudinal direction while compressinæ the return spring. Upon this move~ent, the rigid ring of the diaphragm come~ to the li~iter and stops, thereby arresting further move~ent of the diaphragm.
~he workin3 platfor~ moves orl by inertia and carries the valve alon~. The valve breaks awag from the diaphraOm ; rin~ and compres~ed gas from the workin~ chamber is dis-charged to the atmosphere throug~ the resulting ~ap between the valve and the dîaphragm xing and ce~tral opening i~ said diaphragm ring. By tbis time, the injectîo~
~eans located in the body ceases to deliver compressed ~as to the wor~i~g chamber. $fter that, the diaphra~m with the ring is returned to the initial position under the ef~ect of its elastic ~orces or by other special means. Under the e~fect o~ the xeturn sprin~, the working plat~orm per~orms it~ re-turn stroke until the valve is pressed a~ainst the diap~ragm rin$O ~he worki~ c~a~ber i~ rendered airti~ht be~ore starting the inJection o~
compressed ~as thereto, and the cycle is repeated.
The last-described vibrator could not ~ind wide ap-plicatiou because o~ insu-Eficient power. The force gene-rated in the vibrator working chamber cannot be ~ully lo transmitted via the diaphragm to its central ring a~d the ~/orking platform inas~uch as the worki~g sur~ace of the diaphragm reduces rapidly at the -ti~e o~ its bul~ing. ~his is due to the ~act that -the diaphra~m starts stretching ~rom the peripheral portion to the center thereo~ until it reaches its elasti¢ limit and ceases to participate in the useful work oE movi~g the worki~g pla~form.
In additionl such vibra-tors su~er ~ro~ the comple~-ity o~ their design and the design o~ their inaection and discha~e mea~s w~ch operate unreliably in dust-laden abrasive media and are subject to rapid we~r.
Known in the art are also cup type vibrators (c~., earlier application b~ the present Applicant~) util-izinO ~or their operatio~ a ~luid medium and used~ i~
particular, ~or drivi~g vibration conve~ing devices~ The 1~4~

working plat~orm of said vibrators performs vibrations in a perpendicular direction or inclined direction rela-ti~e to its sur~ace, or in the ~orm o~ a traveli~ longi-tudinal wave in the case of a rigid design o~ the workin6 platform. The vibrator is provided with a station~ry base, a worki~g platfor~ and a cup mounted between the two, all o~ these de~ining a working chamber~ The cup may be ~ixed to the base or to the plat~orm, or to both of them simultaneQusly~ ~he cup must have at least one discharge openi~g whose elastic edges are inte~mit-tently tightl~
pressed against the surface of the base or workin~ plat-~orm under the effect o~ the fluid medium pressure in the working chamber. ~he workin~ stroke required to unbend the sealing elastic edge o~ at least one dischar~e openi~æ
o~ the cup over at least one portion is made less than the full movement o~ the worki~g platform through a value re~uired to obtai~ the desired section o~ a discharge channel ~ormed bebween the cup and the working plat~orm ; or base, respectively. In order to vary the value of u~-bendi~g the sealing edge of the aUp9 it can be provided with a stroke limiter.
In spite of the ~umerous ad~antageous qualities of ~aid latter vibrators, they lack active impact distur-bance that would effectively bring the material being .
_9_ tleated to a dynamic stat~ Moreove~, they lack an ade--quately hi~h ~requency of impact disturbance due to a re-latively passi~e return stroke o~ the working plat~orm.
In view o~ the aforecited reasons, such vibrators lack high i~pact powex. I~ quite a number of cases, such ~ualities are essential, in particular~ ~or vibration conveying devices, for improving the efficiency, especial-ly when conv ying a viscous, sticky material.
It is an object o~ the present invention to provide a vibrator ~eaturing a hi~h and controllable frequency o~ i~pact-~nd impact-~ree disturbance.
It is a~other object o~ the present invention to provide a vibrator of simple desi~n, having small overall dimension~ and ~vei~ht, that would be capable o~ reliable operatio~ in aggressive, humi.d, dust-laden and abrasive media, as well as in liquid media.
It is still another object o~ the present invention to provide a vibrator that would be e~sy to maintaîn, requirin~ no special servici~g and lubrication or means ~or protection ~rom the einviro~ment.
It is a further object o~ the present inventio~ to provide a vibrator noted ~or its reliable start-up and ~peratio~ at any orientation in space.
It i~ still ~urther obJect o~ the present i~ventio~
to reduce the flow rate of the ~luid medium consumed by the vibrator.

~a9~

It is yet further object of t~e present invention to provide a~ all-purpose vibrator that could be used i~ diverse machines, mechanisms a~d devices in which actuatiDg element vibrations are to be per~ormed with controllable frequency and single-impac-t energy~
The present invention resides in that in a vibrator actuated by means of a ~luid medium under pres~ure in order to i~part vibrations to a workin~ platform carrying ~ the ~a~erial bein~ treated, said vibrator comprising a base provided on the side o~ the working pl~tform with a resilient cup formi~ a working chamber and made as a closed loop with at lea~t o~e discharæe openin~ havinO
a resilie~t edge per~ormin~ vibrator~ motion u~der -the efiect of the ~luid medium a:~d desi~ned t~ impart vibra~
tio~s to the workin~ plat~orm. Accordi~ to the invention, a percussion body i9 arrangad on the cup on the side o~
the working platfor~, said plercussio~ body cooperating with the working platform upon the cup vibrations under the effect o~ the ~luid medium and imparti~g impact vib-: 20 rations to said wor~ing platform.
Such a structural arran~ement of the ~ibrator helps attai~ a~ active impact disturbance o~ the working plat-for~ a~d~ conseque~tly, o~ the material bein~ treated placed the~eon~ In addition, such an arra~gement help~
de~elop a vibrator of hiæh impact power. ~he energy and , .

`~L4~2~7 frequency of impact disturbance o~ the wor~in~ plat~orm can be controlled by varying the amount o~ ~luid medium supplied to the vibrator under pressure, say, by ~ean~
of a tap. ~he resul-ting vibrator is simple of design . and h~s no precision friction parts. The vibrattor has small overall dimensions and wei~ht per unit impact power; it is capable of reliable operation in ag$ressive, humid, dustladen, abrasive and even fl~oded environ~ent, and requi-res no lubrication or purification of the fluid ~edium lo ~rom possible impurities.
The vibrator is e~sy to maintain and requires little technical servicing and lubrication, nor does it requ~re any special me~ns o~ protectio~ ~rom the environment.
~hanks to the a~ore-listied qualities, the vibrator of the invention may find ext;ensive use in the various machines a~d ~echanisms havir~ diverse ~ech~ical functions.
It is expedient that the percussion body should have a weight greater than the force o~ el~stic deformation of the cup.
~his provides a simple wa~ of increasing the impact power o~ the vibrator and reducing the speed with which the impact load is applied to the working plat~orm. It will also result in a prolonged service li~e o~ the vibra- ;
tor and o~ the object it sets to vibratory ~otion. The probabilitiy of e~ergence and furthPr development of fatigue J~49Z'9l7 microcracks in parts of machines and mechanisms subjected to vibration impact load will be reduced.
In a number o~ cases it is expedient that the percus-sion body should be connected to the base by means of at least one resilient member ensuring a speedy return o~
the percussion body to the initial position.
Such an arrangement helps considerably increase the impac-t loading ~requency. In addition, this o~fers a simple way of keeping the percussion body o~ the base lo from lateral displace~ent~
In most cases, it is expedient to fix the base to the working platform.
In this manner, the vibrator recoil reaction in the ~orm o~ an impact-iree or impact po~er pulse can be passed on to the workin3 platform and, via the latter, to the m~terial bei~g breated located on the plat~orm ~or in-creasing vibrations o~ said material. ~he loading ~re~uency o* the working platform is increased, as ~ell as the vib-rator efficiency. The linkage of the base ~ith the working plat~orm can be made rigid or flexible, or elastic, in the form o~ springsO In the latter cases, peaking loads on joint elements are reduced to prolong the service li~e o~ said elementsc In addition, the energ~ stored by the fle~ible or resilient linkage can be usefully released ` ~ ~
~49~ 7 to the worki~g plat~or~ and further to the material bei~g treated to i~crease its vibrations.
I~ some cases, it is ~easible to connect the percus-sion body to the worki~g platform or base by means o~
links serving to limit the movement of the percussion body in tho plane parallel to the working platform.
~ his will make for an easy orientation of the~ibrat-or in space, without a~fecting its start-up and general performance. I~ such lin~age is made as a resilient sheet or ~le~ible filaments, the vibrator can be mounted at any angle to the horizont~l plane. In addition, this results in an improved start-up and more accurate operation of the vibrator thanks to the e:limination of the possibility o~ ske~ing o~ the percussion bod~ in the plane o~ its cont~ct with t~e resilient edge of the cup discharge ope-ning.
It is e~pedient that the cup should be secured to the percussio~ bod~
~his will ~acilitate to carry out replacement of the cup together ~ith the striker without removing the base from the foundation or disconnecting it from the ~orking platform.
In some cases, it is desirable that the ~esilient edge of the cup discharge opening should be provided with a member desig~ed to ensure its ~orced return to the i~itial position.

~49;~

This will help increase the vibrator power, especial-ly so, when utilizing ~ liquid fluid medium ~or i-ts ope-ration, owing to a~ increase o~ the section of the discharge channel and i~ the time during which said channel stays open, thereby improving the conditio~s o~ discharging the ~pent ~luid medium from the worki~g chamber to the enviro~ment.
It is further expedient that the working chamber o*
the vibrator should be provided with valve means at the inlet where the fluid medium is delivered -to said chamber and the delivery of the fluid medium is discontinued while the spent fluid medium is discharged to the environment.
~his helps reduce the flow rate of the ~luid medium and9 thereby, increase the vibrator e~iciency. In addition, the impact power o~ the vibrator will be also increased owin~ ~o a reductio~ o~ cou~ierpressure in the working chamber upon the return stroke of the percussion body a~d a subsequent increase o~ its working stroke.
~he present inve~tion resulted i~ the developme~t o~ a series of vibrators ~eaturing di~erent il-~pact power and impact ~requency and capa~le o~ e~fecting an active vibration impact disturbance o~ the material being treated. All of these vibrators e~hibit reliable operation under severe ambie~t condition~
~he present in~ention will be better understood upon .

~19`

co~sidering the following detailed description of specific embodiments thereof, with due reference to the accompanyinO
drawi~gs in which:
~igure 1 shows diagrammatically a percussion vibra tor accordi~ to the invention, wherein a percussio~
body is connected to a base b~ means of resilient members, and the base is stationary;
~igure 2 - ditto, the moment the percussion body de-livers an impact a~ainst a working platform;
~i~ure 3 shows diagrammatically a percussio~ vibrator accordinæ to the invention, wherein the base is secured to the worki~æ plat~orm, with a cup having a C-shaped section;
Figure 4 ditto~ the mome~t the percussion body de-livers an i~pact against the working plat~orm;
Fi~ure 5 shows diagrammatically a percussion vibrator a¢cording to the inventlon, wherein the base is co~nected to the working plat~orm by means o~ a spring suspensio~9 the cup is provided with a remote-controlled stroke li~iter, and the percussion body is connected to tho base b~
means of an articulated member;
ure 6 is a plan view o~ the vibrator show~ in ~ig. 5, with the working platfor~ removed;
~i~ure 7 show~ diagr~maticall~ a percussio~ vibrator ~149~:~7 according to the invention, wherein the percussion body is connected to the work.ing platform by means o~ a torque link, the cup is provided with a member desig~ed to ensure a forced return o~ its resilient sealing edge to the initial position, a~d a working chamber is provided with valve means;
~ igure 8 shows diagrammatically a percussion vibrator according to the inven-tion, wherei~ the cup is mounted betwee~ the worki~g platform and the percussion body, ~Yhile ~ spring ~esigned to return the percussion body to the i~itial position is located betwee~ said body a~d the base; and ~igure 9 shows a vibrator wherein the percussion body is co~nected to the workin~ plat~orm by me~ns of springs.
Shown by arrows in the <~awings is the direotion in whi¢h the fluid medium is delivered to the vibrator and discharged therefrom.
Whe~ describing t~e e~mplarg embodiments of the present inventiou, concrete narrow terminology has been used ~or the sake o~ clarityO However~ the invention is not limited by the terms adopted, and it should be borne in mind that each o~ these terms embraces all the equi-valent elements working analo~ously and used to solve similar problems. ~huQ, the term "cup" is used to cover all ~ the resilie~t or .elastic elements o~ di~erent . . 17-~L~492~f shape which are used in at least o~e place ~o provide a ti~ht seal of the vibrator working cha~ber under tne e~fect o~ the fluid medium pressure in said chamber.
Re~erring no~ to Fi~s 1 and 2 of the accompanyi~g drawings, the hexein disclosed vibrator is used in combi~
nation with a vibration conveying device, namely9 with a vibratory ~eeder ins-talled in an outlet working ~or dischar~ing the mined rock material by gravity, conveying it and loadin~ into conveying means such as conYeyer, dumpcar and the like. The vibrator has a base 1 rigidly fixed o~ the ~ou~d of the outlet workin~ (accordi~g to the given embodime~t) and a working platfor~ 2 mounted -thereabo~e, the workin~ plat~orm according to this parti-cular embodiment having a large axea and servi~ as a feeder vibrati~ plat~orm. One end o~ the working plat-~orm is arranged u~der the mined material discharge funnel while the o~her, inclined end races the co~veyin~ device container. Placed on the base 1 is a cup 3 serving to seal a working cha~ber 4. A percussion bod~ 5 in the form of~ say, a plate is located on the cup 3 between the base 1 and working platfor~ 2. ~he percussion body 5 is mou~tad ~or reciproca~ion between the base 1 and the working plat~orm 2 under the prassure of a ~luid mediu~ in the worki~g chamber 4, and for cooperation with the worki~
platform 2 by imparting ir~pact vibra-tions t~ the latter.

2~7 ~he cup 3 has at least one~;discharge openin~ 6 whose re-silient sealing edge 7 ensures the sealing of the working chamber 4 upon forward stroke o~ the percussion body 5~
i.e., upo~ i-ts upward movement shown in Fig. 1, as well as the seal failure of the working chamber 4 be~ore the percussion body 5 has delivered an impact against the working platform 2 (~i~. 2). ~he cup 3 can have a~y structurally acceptable shape ensurin~ the sealing o~
the working chamber 4 upon forward stroke o~ the per-cussio~ body 5 and the loss of seal by said chamber at the end o~ said forward stroke, as well as the sealing o~ the working chamber 4 at the end o~ the return stroke o~ the percussion body 5. ~he cup 3 can be made o~ any resilieut or elastic material such as polymer, xubber or even mebal, or a combination o~ such materials. ~he cup can be made o~ rubbex-treated rabric a~d rei~orced with polymer~ steel g~uze or wire, or it can even be made of steel~ with its sealin~ edges rein~orced with a resili-ent material. Depending o~ the embodiment~ the cup ~ can be mounted in the ~ibrator without a~ rigid attac~ment, or it can be attached to the base 1 or to the percussion body 5, as show~ in Figs 1, 2, or to both o~ themO
I~ the cup is ~ixed to the base (no-t shown), at least one its discharge opening 6 ~aces the percussion body 5 w~iIe its resilie~t sealing edge 7 is ti~htly ~4~

pressed by the pressure of the fluid medium i~ the worki~g cha~ber 4 against a sealir~ sur~ace provided on the percussion body. I~ the cup 3 is attached to the percussion body 5~ as shown in ~igs ~,29 at least one its dischar~e ope7-1ng 6 faces the base 1 a~d its movable resilient seali~g edge 7 is pressed by the pressure o~
the working fluid in the working chamber 4 agai~st a sea-ling surrace 8 provided on the base 1. I~ -the cup 3 is provided with top and bottom resilient sealing edges which ensure the sealing of the wor~ing chamber 4 above and below the cup ~ u~der the effect of the fluid medium pressure, the cup 3 may stay unattached to neither one of the base 1 and the percus~ion bod~ 5 (not shown). The movabl~ resilient sealing ed~;e 7 o~ at least one discharge opening 6 o~ the cup 3 a~d in at least o~e portion should have it~ unbending stroke lcc3s tharl the percussion body stroke i~ one or the other di.rec-tion. ~his is re~uired ~or formi~g a dischar~e channel 9 (Fig. 2) betwee~ the xesilie~t sealing edge 7 o~ th~ discharge opening 6 o~ the cup 3 a~d the sealing surface 8 provided9 say, on the base 1~ said channel servin~ to com~unicate the working chamber 4 with the environme~t for discharging ~rom said chamber the spent ~luid medium. The degree of un-bendinæ th~ edge 7 o~ the cup 3 c~n be limited by a number o~ technlquesg for example, by using a special -2~-~49;~7 limiter of the edge stroke such as a ~le~ible coupling capable of arresting the edge movement upon reachin~ a preset degree of unbending; this can also be done by increasin~ the sti:E~ne~s o~ the movable portion o~ the cup, ~or e~ample, by making it thicker or b~ selecting a sti~fer material~ Fi~s 1,2 illustrate the case when limi~ing the stroke o~ t~e resilien~ sealing ed~e 7 of the dischar-~e openinæ 6 o~ the cup 3 is done by proper selection o~
material~ adequa-te width of the xesilient sealing edge 7 and the circular shape of the discharge opening 6 of the cup 3, all o~ which ~actors combined with the calculated pressure of the ~luid medium ensure a preset maxi~um de~ree of unbendi~g o~ the edge 7 ~rom the initial positi-on (as shown in ~igo 1) over the entire perimeter o~
the worki~g chamber 4, as is the case i~ this particular embodimenb.
In plan, i.e., in a plane parallel ~ith the base 1, the.wor~ing chamber 4 ca~ have any s-tructurally sound shape such as a square, parallelogram, triangle, circle etc. ~he iluid medium u~der pressure is supplied to the working chamber 4 Yia ~hrottle cha~nel 10, the fluid medium source (not shown) communicating with the vibrator via pipeline 11 attached, i~ particular, to the base 1.
Valve ~ean~ or ~ome other inlet means may be used instead o~ th~ throttle channal 10. ~or a fuller a~d moxe vi~orous --2'1--9Z~

perfor~ance by the percussion bod~ 5 o~ the re-turn stroke;
i.e., of its return to the initial position, the weight of the percu~sion body 5 should be made greater than the composite ~orce o~ total elastic delormation o~ the cup 3 in its extreme cor~pressed position, with the minimum volume of the worki~g chamber 4. In case a hi~her fre-quenc~ o~ the vibrator operation is desired 3 the percus-sion bod~ 5 should be coupled to the base 1 with the aid of at least one resilient member such as springs 12 (Fi~s 1, 2 ) to ensure a speed~ return of the percussion body 5 to the initial position. I* the vibrator is only slightly inclined to the horizontal, said springs 12 are quite capable o~ keeping the percussion body 5 ~ro~ la-teral displa¢ement i~ a plane parallel to the base 1. ~or damping the impact loads, a resilient spaoer may be provi-ded between the working plat~orm 2 and -the percussion body 5, such as a resilient spacex 13 manu~ac-tuxed and secured to the percussion body 5 as shown in Figs 1,2.
~ined roc~ material 14 moves over the Y~or~in~ plat~orm 2 ~Jhich, according to the present embodi~ent, serves as -~he vibrating platfor~ o~ a feeder.
S~own in ~i~. 3 is a vibrator embodime~t wherein a base 15 is secured to a working platfor~ 16 by ~eans o~ linkage 17. Said linkage 17 may be ri~id, elas-tic or ~1492~

resilient; olving to said linka~e, ~he vibrator recoil reac-tion taken up by-the base 15 can be passed on to the vibrati~g platform 16 ~or increasing vibrations of the latter together with the material being treated and loca-ted thereon (not shown).
~ig. 3 illus-txates a c~se when a cup 18 is made as a closed loop with a C-shaped section, has several discharge openinOs 19 and is a-ttached both to the base 15 ~nd to a percussion bod~ 20~ This helps keep the per-cussion body 20 from lateral displacement relative to the base 15. The same purpose is served by springs 21 provided between the working plat~orm 16 and the percussion body 20 and ensurin~ a speed;y retur~ of the latter to the initial position. For reducin~ t~e inactive volume of a working chamber 22, the latter may acaommodate there-inside a ~iller 23 connected with the base 15. At the same ti~e, the ~iller 23 can serve as an anvil ~or impact ; bracking o~ the percussion bod~ 20 at tAie end o~ its return stroke. ~he ~iller 23 can be ~ade o~ some hard material or~ ~or damping the impacts, of a resilient material such as rubber. ~ig. 4 shows the same vibrator at the moment the percussion bod~ 20 delivers a~ impact a~ainst the worki~g platfor~ 16. At -this moment, between the re~ilient seali~g edge o~ the discharge openings 19 ~g~

and the sur~ace o~ their ~it to the percussion body 20 there ~or~ dischar~e channels 24 for draining the fluid medium ~rom tha workin~ chamber 22, via which cha~nels said chamber communicates with the environment.
~ i~. 5 illustrates a vibrator wherein the li~kage serving to connect its base 25 wi-th a working plat~orm 26 is made resilien-t, in the form of a spri~g suspension 27. ~his helps reduce peaki~g tensile stresses in joint elements and, at the same time 9 permits of storing energy i~ the spri~g suspe~sion 27 at the momen-t of the maximum vibrator recoil reactio~ and o~ transferring said enexOy more smoot~ly and usefully to the working plat~orm 26 at the mome~ts when the moveDlent o~ the latter coincides with the direction o~ forces stored in the suspension 27, which results in increased vi.brations o~ the worki~r plat~orm.
~ig. 5 also shows a vibrator embodiment wherei~ a cup 28 is attached to the base 25 and is provided with a limi~er of t~e stroke of its movable sealing edge9 said limiter bei~g made in the forn o~ a screw 29 mounted in the base 25. O~e end of the screw 29 is con~ected via ~lexible member with the resilient edge o~ the cup 28, and its other end is co~nected~ ~or example, wit.~ a remote co~trol flexible coupling 30, ~he stroke limiter 29 helps 9~

improve the precision of the vibrator operation and even per~its o~ remote con-trol over its operatln~ condiuio~s9 i.e., o~ varying the ~reque~cy and energy o~ its single impacts. This is attained by way o~ disengaging the cup 2~ ~rom a percussion body 31 at a later or earlier stage and by ~orming a discharge channel communicating a working chamber 32 with the environment, and thereby increasing or reducing the acceleration path o~ the percussion body 31 under the pressure o~ ~luid medium in the working cham-lo ber 32.
~or a more accurate operatio~ o~ the vibrator, it i5 deæirable that the percussion body 31 should exhibit less skewing in a plane parallel to the base 25 or working plat~orm 26 and per~orm no lateral displacement i~ the same plane. To this end, it ~s expedient to couple the percussion body 31 with the base 25 or working plat~orm 26 b~ means o~ iks serving to limit the movement o~
the percussion body in a pl~ne parallel to the working platfor~ 26 or base 25. ~ig~ 5 shows o~e such embodime~t wherein the percussion body 31 is co~nected ~ith t~e base 25 by means of a ~lexible or resilient sheet ~
operating as a woggle join~. Wi-th such an arrangement, the percussion body 31 may per~orm pendulum-like motion, and i~ is there~ore desirable that -the base 25 should be arranged relative to the workin3 plat~orm 26 at an -~5-,2~

an~le equal to the vib~atio~ angle o~ the percussion body 31. This is not essential9 however~ in the case of slight displacement of the percussion bod~ 31,~or the vibrator operation is quite adequate under conditions o~ such suspension of the percussion body~ ~vith the base 25 arranged in parallel with t~e worki~g plat~orm 26.
Fig~ 6 is a plan view o~ the same vibrator with the workin~
plat~orm removed. This illustrates a possible embodiment of the ~lexible or resilient sheet 33 and its coupling to the percussion body 31 and base 25. Flexible ~ilaments can be used instead o~ the sheet 33, for example, the percussion body can be suspended from a rope or ropes.
This is convenient in case the vibra~or in the operating positio~ is placed at some anOle to the horizontal, such that said links are i~ tension. I~ the vibrator is likely to be placed at an~ previously unspeci~ied angle or it is lil~ely to change its position in space in the course o~ operation, the percussion body should rather be conn~cted with a base 3~ or worki~g plat~orm 35 b~ means of a flat hi~ge or torque li~s 36, such as those show~
in Fig. 7, capable of operating both in tension a~d compression.
~ig. 7 shows an embodiment of a cup 37 provided with a llat spring member 38 designed to ensure a forced -~6-return of its resilient- seali~g edge 39. The spring 38 îs attached to the base 3~ and connected with the sealin~ edge 39 of the cup 37 such that~ i~ the free state, said spring 38 tends to press the edge 39 a~ainst the base 34. The ~orce o~ the spring 38 is selec-ted such that, during a ~orward s-troke of a percussion body 4~ until ~he ~ormation of a dischar~e channel bet ween the latter and the sealing edge 39 of the cup 37, the spring 38 should be incapable of breaking the sealing edge 39 of the cup 37 away ~rom the seali~$ surface o~
the percussion body 40 to which surface said edge is urged by the fluid medium pressure in a workin~ chamber 41, i.e., such that the sprin~ 38 be incapable o~ prematurely un-sealing~ the workin~ ch~mber 41. The return o~ the cup 37 to the initial position can be e~ected in numerous other ways and by o~her means permitting of a rapid return of the resilient se~ling edge 39 o~ the cup 37 to the initial positio~ not cnl~ in a single portion but in several portions or over the e~ire seali.ng perimeter o~ the ~orkin~ chamber ~ his can be attained, ~or e~ampleg by arrangi~g the sprin~ 38 over the entire length of the resilient edge 39 o~ th~ cup 37 7 placing it above or below, or working it into the bod~ of the cup 37. Such an ~rrangeme~t helps improve the vibr~tor 1~4~ L7 opera-tion; especially so~ when utilizi~ a liquid ~luid medium.
~ or a ~ore efficient operation o~ the vibrator, it should be provided at the inlet of the Pluid medium to the working cha~ber 41 with valve means through which the fluid medium should be delivered to the workin~
chamber and said delivery disco~tinued when the spent ~luid medium is discharged to the environment, for e~ample, as shown in ~i~. 7. Re~erring to said latter Figure, a spri~g-biased valve 42 is provided ~ith a rod cooperatin~
with the percussion body 40 in the e~tre~e lower position o~ the latter, i.e., at the e~d o~ its return stroke.
~hus, the percussion body 40 while reciprocating performs the opening and closing of the valve 42. In this manner, the deliver~ of the ~luid meclium to the working chamber 41 ~rom a ~luid medium source can be disao~tinued for the time o~ discharging the spent fluid medium to the en-vironment to ~void useles~ waste of said fluid medium.
~his ~elp~ improve the vibrator economy, increase the ef~icienc~ and, in particular, improve its operation under conditions o~ utilizing a liquid fluid mediumO
Fig. 8 illustrates a vibrator embodime~t wherein the workin~ chamber is defined by a cup 44 located between a percussion body 45 and working plat~orm 46, ~hile a spri~g 47 desi~ned to return the percussion body 45 to `'`' .

2~a7 the initial position is mounted between said body and a base 48 urging the percùssion body against the wor~ing platform 46. I~ this particular embodiment, the base 48 is secured to the working platform 46 while the deli-very of the ~luid medium to the workin$ chamber is ef-fected via channel 49 provided in the worki~g plat~orm 46. Such an axran~eme~t proves convenieIlt when the vibra-tor operating conditions call ~or ef~ective impact distur-bance in the directio~ of the base 48.
~i~. 9 shows a vibrator wherein a working chamber - 50 is likewise formed between a percussion body 51 and a working~ platform 52, while the percus~ion body 51 is connected to the worki~g platfor~ by means o~ a ~le~ib-le suspension such as sprin~s 53 urgi~ said body ag~inst the working platform. Such an arran~ement somewhat simpli-fies the vibrator design.
~he vibrator accordi~g to the present invention, show~ in ~igs 1 and 2, o~erates in the ~ollowing ma~ner.
Assumed as the initial position i~ one shown in Fig. 1 wherei~ the percussio~ bod~ 5 is i~ the extreme lo~er position and the cup 3 attached thereto is in the compxessed positio~ while its resilient seali~g edge 7 is pressed agai~st the sur~ace 8 o~ the base 1. Upon actua-tion, the ~luid mediu~ staxts ~lowing via pipeline 11 .

_~9_ z~ ~

and throttling channel 10 to be pressure delivered to the ~vorkin$ chamber 4 while building up pressure in the latter. Under the effect o~ said pressure, the cup 3 acts to seal the working chamber ~ while the percussion body 5 starts its accel~rated upward ~ove~ent ~o perform a ~orward stroke and to deliver an impac-t against the working platform 2 at the end o~ said stroke. I~ the re-silient spacer 13 is absent, the impact is harder, while the provision of the resilient spacer 13, as shown in ~igs 1 and 2 9 results in a some~hat damped impact whose effect is stretched in time. Prior to i~pact, the cup 3 is carried by the percussion body 5 away ~rom the base 1 and, i~ at least one ~lace, its resilient sealin~ edge 7 will break away from the sur:Eace 8 of ~he base ~ to ~orm between them th~ discharge channel 9 (cf., ~ig. 2) throu~h which the spent fluid medium under pressure starts dischar-~ing to the environment. ~he pressure in the working cha~ber 4 will then drop dow~ to zero. ~his will be assis-ted by the resilient properties o~ the cup tending to shi~t its seali~g~ edge 7 to the i~itial positio~, i.e., to press the edge against the percussion body 5 and thereby increa-se the section of the discharge channel 9~ While so doing, the fluid mediu~ supplied under pressure to the worki~
cha~ber 4 ~ia throttling channel 10 is incapable o~ buil-

-3~-`'" ' 9Z4~

ding up considerable excess pressure in said Ghamber due the loss of seal by the lat~er. After delivering an impact against the ~orkin~ platfor~ 2 the percussion body 5 starts perfor~ing its retùrn stroke~ i.e., do~ward motion, under ~he e~ect o~ rebound and by gra~ity. When the cup 3 carried alon~ by the percussion body 5 comes in con-tact with the base 1 and its resilient edge presses against - the surface 8 of the base 1 to seal the worki~g chamber 4, the pressure in the latter will start rising. The ~rcus-sion body 5 will by that time spend its energy and stop under the e~fect o-~ pressure i~ the workin~ chamber 4, after ~Jhich the pressure in the chamber 4 ~ill cause the percussion body to start its up~ard motion, i.e., forward stroke, and the cycle is repeated.
If the percussion body 5 is connected to the base 1 by means of the spri~s 12 actinO to press sai~ body against the base 1~ the return stroke of the percussion body ~ill be more vigorous a~d the vibratio~ ~requency higher. However, i~ order to preclude a drop in the energy of sin~le impacts, it is necessary that the active area of the w~r~i~g chamber, which can be assumed equal to an area de~i~èd by the li~e of contac-t of the side sur~ace of the cup ~ with the base 1, should be increased to di-mensions compensating ~or the force o~ the ~rings 12.

-31-~

~ 291~, ~he imp~ct ener~y is directly proportional to the acti~e area o~ the v~orking chamber 4, pressure in the latter and the acceleration path of the percussion body 5 under the e~fect of said pressure. In order to ob-t~in low pre--impact velocities of the percussion bod~ with preset energy, it is su~ficient to increase the active area o~
the workin~ chamber 4 and to proportionally reduce the acceleration path of the percussion body 5 under the ef-fect of pressure in the chamber 4 or increase the weight o~ the percussion body 5. I~ the course of operatio~, the operating mode o~ th~ vibrator, i.e., the frequency a~d energy o~ sin~le imp~cts ol the vi~rator, can be varied by varyin~ the degree of openi~g the delivery tap, that is, by varyi~ the throttlin~; of -the pressure supplied ~luid medium.
Such vibrators can be used advantageously in combina-tion with vibratory ~eeders~ as shown in Figs 1 and 2 I~ this case, e~fective impact disturbance brings the mi~ed roc~ material 14 to dynamic state, a~d said material starts ~oving rapidly over the vibrating working plat-~orm 2. While observing the moveme~t o~ t~e mined rock material 14, one can use a starting device (not show~) ~or varying the oper~ti~ mode o~ the vibrator and, thereby, varying i~ a desixed manner the speed o~ movement o~ the mined rock material 14 over the vibra-ti~g plat~orm 2.
~his helps load the conveying means (dump cars) to their full capaci-ty without overloadin~ them.
If the vibrator b~se 15 (~igs 3, 4) is connected with the workin& plat~orm 16 by the linkage 17 such as rigid lir~age shown in ~igs 3, 4, and the spring 21 de-si~ned to ensure the return o~ the percussion body 20 to the initial position is located between said body and -the working platform 16, the ~ibrator operates analogously.
However, in this embodime~t the vibrator~ecoil reaction is trans~erred via linkage 17 to the workingr platform 16 to make for increased vibratio~s of the latter and o~ the ~aterial being treated placed thereon (not sho~n)0 In this manner, the vibrator e~ficienc~ is improved.
I~ the vibrator is desi~,ned such that the percussio~
body 20 at the end o~ its return s-troke may co~e in con bact wibh the ~iller 23 o-~ the base 15, an irlcrease in the inactive volume o~ th~ ~orkir~ chamber 22 under conditions o~ compressed ~as operation may help effect an impact stoppage o~ the percussio~ body 20 ~ith desired energy at the end of its return stroke. ~he impact energ~ will - be the greater7 the less the braking pulse generated i~
the workin~ chamber 22 at the end of the return stroke o~ the percussion body 20v ~his can be assisted by an increase o~ the inactive volume o~ the ~Jorki~g cha~ber 22.

. .

11~9;~47 In this manner, the ~requency o~ the vibrator impacts can be doubled9 with a possibility o~ produci~g i~pact dis-turbance in both direc-tions.
~ he performance o~ the cup 18 having a C-shaped sec-tion over the contour of -the working chamber 22 and a series of discharge o~enings 19 i~ the sealing part t~ereof does not in ~act dif~er from that of the cup 3 shown in ~i~s 1, 2. Its sealing edges also have a limi-ted unbendin~
stroke, for example, owin~ to selection of t~e material, or a special limiter o~ the unbending stroke may be provided.
It should be taken into account that the presence o~ a series o~ the discharge openin~s 19 reduces the operating cross section o~ the discharge channel 24 (Fig. 4) formed at the end o~ the forward stroke o~ the percussion body 20 between the sealin$ sur~ace thereof and the resilient edges o~ the dischar~e openi~s 19 and, therefore, the width o~ the channel 24 shou:Ld be increased accoxdingly.
~hîs ca~ be done by reducing the degree o~ unbendi~g the sealing portion o~ the cup 18 or by increasing the full ; 20 working stroke of the percussion body 20, for example~ by way of increasi~ the distance between the base 15 and the working plat~orm 16~
If the base 25 ~ig~ 5) is connected to the worki~g plat~orm 26 by means o~ the spri~g suspension 27, as shown ` ~4~2~L7 in ~ig. 5, the vibrator recoil reaction a~f2ctin~ its base 25 will be transferred to the working platform 26 ~ithou-t peaking loads, for said reaction will be damped by the spring susPension 279 which appeals ~ece-ssary in some cases. In its turn, the energy stored i~ the spring suspension 27 at the moments the direction of the e~lect of the spri~g upon the workin3 platform 2~ coincides with the direction of actual movement of the labter will ef-fectively increase the vibrations o~ the working plat-form and of the material being treated (not shown) loca-ted on the plat~orm.
The vibrator shown in ~ig. 5 is provided ~vith a stroke limiter 29 o~ the resilient edge o~ the cup 28, said limi-ter having the remote control flexible shaft 30 which can be instrumental in changing the time of formation of the discharge ch~nnel servinl~ to communica~e the working ch~ber 32 with the einviron~en-t. ~his results in increa-sing~ or reducin~ the p~th o~ ru~ of the percussion body 31 upon its forward stroke and, consequently, in increa sing or reducing its impact energ~. While so doi~, the impact frequency variQs somewhat. Changing the time o~
formation of the discharge channel by the stroke limiter 29 of '~e resilient edge of the cup 28 in combination with the variation o~ the amount ~ the fluid m~dium supplied, by me~ns of a starting cock one can vary over a wider g~æ4~

range the energy o~ single impacts and their ~requency in lesser dependence on each other.
~ he vibrator operation in case its percussion body 31 is connec-ted with the base or working platfor~ by rneans of the resilient sheet 33 (~igs 5~6) or torque link 36 (Fi~. 7) will be analo~ous, however, the stability o~ operation will improve inasmuch as the beginni~g of unsealing o~ the working chamber and the beginning of its sealing will occur with less deviatio~ lxom a preset part o~ the path o~ move~ent o~ the percussion body tha~ks to eliminating the possibility of skewing of the percussion body relative to a sur~ace of its contact with the resilient edge o~ the cup.
~he use o~ the member 38 (~ig. 7) designed to ensure a ~orced return o~ the resilient sealing edge ~9 of the cup 37 to the initial position over at least one portion of its operatin~ length helps considerablg improve the vibrator operation. ~his is due to the fact tha~, all other thi~gs being equal, the sealing of the workinæ cham-: 20 ber 41 by the cup 37 will take place at a somewhat later : stage and the percussion body 40 will perform a somewhat longer return stroke. ~he forward stroke o~ the per-: cussion body 40 w~ll increase accordingly~ or rather its acceleration path under pressure ~rom the working chamber 41 ~his results in an increased energy of single impacts 114~Z~
practically without increasing the time of ~he full cycle a~d, consequently, in an increased impact power ol the vibrator without varying its other para~eters (such as dimensions t weight, etc).
~ he use of the valve means 42 for the delivery o~
the fluid mediu~ u~der pressure to the working chamber 41 and ~or discontinuing said delivery, as sho~n in Fig. 7, helps improve the e~ficiency o~ the vibxator operati~n and its dynamics. ~irst, the unproductive bleeding of the fluid mediu~ to th~ environment while unsealing the workin~
chamber 41 is avoided; seco~d, the harm~ul premature braking pulse emerging in the working chamber 41 at the end o~ the retur~ stroke o~ the percus~ion body 40 is reduced, thereby increasing tho retur~ stroke of the percussion body and, conse~uently, its forward stroke. ~e energy of si~gle impacts is increased, as well as the impact power o~ bhe ~ibrator.
~he performance of the vibrator show~ in Fig. 8 is analogous to that o~ the vibrator show~ igs 3,4, ex-cept that active impact loadiD~ is e~fected over the base 48 and is directed towards the latter to be transferred to the working platform 46 via the linkage coupling the latter with the base 48.
~he per~ormance of the vibrator sho~ în ~i~. 9 is -3?- !

`: :
~ 9Z47 analogous to that o~ the vibrator shDwn in ~ig. 8, without a~y essential differences between them.
It should be borne in mind that the embodimants of the present invention, shown in the drawings and described hereinabove, are but some possible preferred embodiment~
t~ereof. Othar embadiments are possible as regards tha shape, size a~d position of si~le parts a~d elements thereo~. For example9 the p~ and elem~ th~reof` ilL~s-trated in t~e accompanying drawings and described above lo may be r~placed w~th equivale~t parts and elements~ the position o~ single parts a~d elements can be Yaried~ single elements of the invention may be used independently o~ each other, without exceeding the limits and scope of the present inventio~ as de~ined in the appended claims.
~ccording to the inventio~, fu~l-scale models o~
th~ disclosed vibrator were subjected to all-rou~d tests during cDnveyance of bulk materials with the aid of vibra-tion conveying devices.
~he tests ha~e s~own the ~ibrators o~ the invention to operate e~ficientlg and reliably under any conditiDns, ; includi~g humid, water-flooded, dust-lade~ and abrasive madia 9 and even in t~e pressnce of large amounts of impu-rities suc~ as rust and sand par~icles i~ t~e pressure ~upplied ~luid worki~g medium ~e impact loading of the vibrati~g plat~orm at low pre-impact v~locitie~ o~ th~

.
3~-percussion body turned out to be more e~fective and helped increase the vibrator capaci-ty and i~prove the smoothness : of the bulk material ~ovement over the vibration conveying device used . ~o deterioration of any o~her properties was observed, as compared to prior art vibrator~O

~39-

Claims (21)

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

1. A vibrator actuated by means of a fluid medium under pressure in order to impart vibrations to a working platform carrying a material being treated, comprising:
a base; a resilient cup mounted of said base on the side of the working platform, forming a working chamber and made as a closed loop with at least one discharge opening having a resilient edge performing vibratory motion under the effect of the fluid medium and designed to impart vibrations to said working platform; a percussion body mounted on said cup on the side of the working platform, cooperating with said working platform upon vibrations of said cup under the effect of the fluid medium and im-parting impact vibrations to said working platform.

2. A vibrator according to claim 1, wherein the weight of the percussion body is greater than the force of elastic deformation of said cup.

3. A vibrator according to claim 19 wherein said percussion body is connected with the base by means of at least one resilient member ensuring a speedy return of said percussion body to the initial position.

4. A vibrator according to claim 1, wherein said base is attached to said working platform.

5. A vibrator according to claim 1, wherein said percussion body is connected with said working platform by means of links serving to limit the movement of said percussion body in a plane parallel to said working plat-form.

6. A vibrator according to claim 1, wherein said percussion body is connected with said base by means of links serving to limit the movement of said percussion body is a plane parallel to said working platform.

7. A vibrator according to claim 1, wherein said cup is attached to said percussion body.

8. A vibrator according to claim 1, wherein said resilient edge of said cup discharge opening is provided with a member designed to ensure its forced return to the initial position.

9. A vibrator according to claim 1, wherein said working chamber is provided with valve means at the inlet where the fluid medium is delivered to said chamber, for discontinuing the delivery of the fluid medium to said working chamber while the spent fluid medium is discharged to the environment.

10. A vibrator according to claim 2, wherein said percussion body is connected with the base by means of at least one resilient member ensuring a speedy return of said percussion body to the initial position.

11. A vibrator according to claims 2 or 3 wherein said base is attached to said working platform.

12. A vibrator according to claims 2 or 3, wherein said percussion body is connected with said working plat-form by means of links serving to limit the movement of said percussion body in a plane parallel to said working platform.

13. A vibrator according to claims 2 3 or 4 wherein said percussion body is connected with said base by means of links serving to limit the movement of said percussion body in a plane parallel to said working platform.

14. A vibrator according to claims 2 3 or 4, wherein said cup is attached to said percussion body.

15. A vibrator according to claims 2 3 or 4 wherein said resilient edge of said cup discharge opening is pro-vided with a member designed to ensure its forced return to the initial position.

16. A vibrator according to claims 2 3 or 4 wherein said working chamber is provided with valve means at the inlet where the fluid medium is delivered to said chamber for discontinuing the delivery of the fluid medium to said working chamber while the spent fluid medium is discharged to the environment.

17. A vibrator according to claim 4, wherein said percussion body is connected with said working platform by means of links serving to limit the movement of said percussion body in a plane parallel to said working platform.

18. A vibrator according to claims 5 or 6, wherein said cup is attached to said percussion body.

19. A vibrator according to claims 5, 6 or 7, wherein said resilient edge of said cup discharge opening is provided with a member designed to ensure its forced return to the initial position.

20. A vibrator according to claims 5, 6 or 7, wherein said working chamber is provided with valve means at the inlet where the fluid medium is delivered to said chamber, for discontinuing the delivery of the fluid medium to said working chamber while the spent fluid medium is discharged to the environment.

21. A vibrator according to claim 8, wherein said working chamber is provided with valve means at the inlet where the fluid medium is delivered to said chamber, for discontinuing the delivery of the fluid medium to said working chamber while the spent fluid medium is discharged to the environment.