SE445090B - SETTING TO ADJUST THE TURN ANGLE BY A VIBRATING DEVICE - Google Patents
SETTING TO ADJUST THE TURN ANGLE BY A VIBRATING DEVICEInfo
- Publication number
- SE445090B SE445090B SE7809573A SE7809573A SE445090B SE 445090 B SE445090 B SE 445090B SE 7809573 A SE7809573 A SE 7809573A SE 7809573 A SE7809573 A SE 7809573A SE 445090 B SE445090 B SE 445090B
- Authority
- SE
- Sweden
- Prior art keywords
- axes
- imbalance
- motors
- center
- gravity
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G27/00—Jigging conveyors
- B65G27/10—Applications of devices for generating or transmitting jigging movements
- B65G27/32—Applications of devices for generating or transmitting jigging movements with means for controlling direction, frequency or amplitude of vibration or shaking movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
- B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
- B06B1/161—Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
Description
7809573-4 (2mlrlw)2 sina cosa (a sin mt+ b cos wt)2 M -M = 1 2 Y (1) där M1 och M2 är reaktionsmomenten kring resp. rotationsaxel; ml och rl är den ena obalansviktens storlek och avstånd från sin rotationsaxel; a och b är rotationsaxelns rätvinkliga koordinater i ett rät- vinkligt koordinatsystem med systemets tyngdpunkt som origo; u är vinkeln mellan slagriktningen och en linje från origo till punkten (a,b); " w är vinkelfrekvensen för obalansmassornas rotation; och Y är systemets masströghetsmoment. 7809573-4 (2mlrlw) 2 sine cosa (a sin mt + b cos wt) 2 M -M = 1 2 Y (1) where M1 and M2 are the reaction moments around resp. axis of rotation; ml and r1 are the size and distance of one imbalance weight from its axis of rotation; a and b are the right-angled coordinates of the axis of rotation in a right-angled coordinate system with the center of gravity of the system as the origin; u is the angle between the direction of impact and a line from the origin to the point (a, b); "w is the angular frequency of the rotation of the imbalance masses; and Y is the moment of inertia of the system.
M1-M2 är då ett återföringsmoment, som vill återföra systemet till riktningen a=o.M1-M2 is then a feedback moment, which wants to return the system to the direction a = o.
Grundtanken som utgör första steget i föreliggande uppfinning ligger i insikten att ekvationen (1) är giltig även omvänt, så att om man inför ett yttre moment, så pâverkas kastvinkeln i motsvarande grad, dvs. man kan med konst få ett värde på a som är skilt från noll. En förutsättning för balans i ett dylikt system är att detta yttre moments arbete är lika stort som syn- kroniseringsmomentets arbete. Cykeln för synkroniseringsmomen- tet är 2n. Om vi integrerar M1~M2 över ett varv, så erhåller vi ur ekvation (1): 21* <2 ml 1-1 w>2 w _ _ I (Ml-M2)dwg = __--¿--::------ sin 2a - - Y = KONST. ' sin 2u. (2) man inser därav att en numerisk ökning eller minskning av ett yttre moment medför en ökning eller minskning av a upp till gränsen 1 450, där stabilitet ej längre kan pâräknas.The basic idea which constitutes the first step in the present invention lies in the realization that the equation (1) is valid also vice versa, so that if an external moment is introduced, the throwing angle is affected to a corresponding degree, ie. one can with art get a value of a that is different from zero. A prerequisite for balance in such a system is that the work of this external moment is as great as the work of the synchronization moment. The cycle of the synchronization torque is 2n. If we integrate M1 ~ M2 over one revolution, we get from equation (1): 21 * <2 ml 1-1 w> 2 w _ _ I (M1-M2) dwg = __-- ¿- :: - ----- sin 2a - - Y = CONST. 'sin 2u. (2) it is recognized from this that a numerical increase or decrease of an external moment entails an increase or decrease of a up to the limit of 1 450, where stability can no longer be expected.
Vid frånvaro av det yttre momentet erhålles, såsom framgår av beskrivningen till uppfinningen enligt svenska patentansökan 7708140-4, en rent translatorisk skakrörelse, utan rotation (vickning). Genom införande av ett yttre moment kommer denna 7809573-4 "jämvikt" att störas, och man får en överlagrad vickningsrö- relse. Emellertid visar det sig både teoretiskt och praktiskt att denna blir av i praktiken helt försumbar storlek.In the absence of the external moment, as appears from the description of the invention according to Swedish patent application 7708140-4, a purely translational shaking movement is obtained, without rotation (rocking). By introducing an external moment, this "equilibrium" will be disturbed, and a superimposed rocking motion is obtained. However, it turns out both theoretically and practically that this will be of practically completely negligible size.
Det är nu möjligt att pålägga ett "yttre" moment på ett stort antal olika sätt. Teoretiskt skulle man t.ex. genom fjädrar eller vid siktlådan fästa vikter kunna rent mekaniskt anbringa ett kraftpar, som tenderar att vrida den upphängda massan. Vi har emellertid bedömt som allra fördelaktigast att påverka de båda motorer som driver obalansvikterna.It is now possible to impose an "external" element in a large number of different ways. Theoretically, one would e.g. by means of springs or weights attached to the sight box can mechanically apply a pair of forces which tend to twist the suspended mass. However, we have judged that it is most advantageous to influence the two engines that drive the imbalance failures.
Enligt uppfinningen åstadkommes sålunda ett sätt för reglering av kastvinkeln vid en vibrerande sikt eller matare genom de i patentkrav l angivna kännetecknen.According to the invention, there is thus provided a method for controlling the throw angle of a vibrating screen or feeder by the features stated in claim 1.
I en dylik reglering kan även innefattas möjligheten att kom- pensera för en ojämn belastning genom att siktmaterialet ej ligger jämnt fördelat.Such a regulation may also include the possibility of compensating for an uneven load in that the screen material is not evenly distributed.
Uppfinningen kommer nu att beskrivas genom ett utföringsexem- pel och i anslutning till ritningarna. Fig. l visar en perspek- tivvy av en horisontalsikt. Fig. 2 visar en schematisk genom- skärningsvy av den ena obalansviktsanordningen i sikten enligt fiq. 1.The invention will now be described by means of an exemplary embodiment and in connection with the drawings. Fig. 1 shows a perspective view of a horizontal view. Fig. 2 shows a schematic sectional view of one imbalance weight device in the screen according to fig. 1.
Siktmaskinen i fig. l består av en siktlâda l, med ett första siktplan 7 och ett andra siktplan 8, vilken medelst fjädrar 2 är upphängd vid ett fundament 9.The screening machine in Fig. 1 consists of a screen box 1, with a first screen plane 7 and a second screen plane 8, which by means of springs 2 is suspended from a foundation 9.
Två motorer 3 driver var sin av ett par i dammtäta kåpor monte- rade obalansviktsanordningar 5 med mellanliggande axlar bestå- ende obalansanordningar. Som framgår av detaljskissen i fig.2 driver vardera motorn via en remväxel ll, monterad i en skydds- kåpa 6 (fig. l) och via böjliga kopplingar 12 (i höljen 4) en axel med obalansvikter 10, parvis roterbart lagrade i siktlådans l väggar. Motorerna är solidariska med fundamentet 9 och vib- reras alltså ej.Two motors 3 each drive an imbalance weight device 5 with intermediate shafts mounted in dustproof housings with intermediate shafts consisting of imbalance devices. As can be seen from the detail sketch in Fig. 2, each motor drives via a belt gear 11, mounted in a protective cover 6 (Fig. 1) and via flexible couplings 12 (in the housings 4) a shaft with imbalance weights 10, rotatably mounted in pairs in the sight box 1 walls. The motors are in solidarity with the foundation 9 and are therefore not vibrated.
Den uppfinningsmässiga effekten uppkommer därigenom att moto- rerna 3, som är kortslutna asynkronmotorer med samma nominella varvtal, kan givas inbördes varierad dragkraft. Om motorerna matas direkt från ett gemensamt växelströmsnät, kommer sväng- 7809573-4 massorna 10 (fig. 2) i de båda enheterna, vilka roteras åt motsatta håll, att synkroniseras, och ett elliptiskt slag erhålles. Genom en icke visad transformatorenhet,av för fack- mannen välkänt slag, som kan vara antingen stegvis eller steg- löst varierbar, kan emellertid matningsspänningen till den ena motorn sänkas. Eftersom de båda motorerna är belastade, kommer de att ha en viss eftersläpning i förhållande till det synkro- na varvtalet. Genom den olika matningen kommer nu den ena mo- torns drivkraft att minska, och eftersläpningen i motorn att något öka. (Givetvis kan andra motortyper och andra styrmeka- nismer av för fackmannen välkänd typ ifrågakomma.) V Det visar sig, i förstone ganska förvånande, att man med denna enkla metod kan åstadkomma en förskjutning av slagets riktning, uppgående till i det närmaste 450 åt endera hållet, beroende på vilkendera av de båda motorerna som erhåller sänkt matningsspän- ning.The inventive effect arises from the fact that the motors 3, which are short-circuited asynchronous motors with the same nominal speeds, can be given mutually varied traction. If the motors are fed directly from a common AC network, the pivot masses 10 (Fig. 2) in the two units, which are rotated in opposite directions, will be synchronized, and an elliptical stroke will be obtained. However, by means of a transformer unit (not shown), of a type well known to those skilled in the art, which can be either stepwise or steplessly variable, the supply voltage to one motor can be reduced. Since the two motors are loaded, they will have a certain lag in relation to the synchronous speed. Through the different feeds, the driving force of one engine will now decrease, and the lag in the engine will increase slightly. (Of course, other engine types and other steering mechanisms of a type well known to those skilled in the art may come into question.) V It turns out, at first quite surprisingly, that with this simple method it is possible to achieve a displacement of the direction of impact, amounting to almost 450 at either depending on which of the two motors receives a reduced supply voltage.
Den teoretiska förklaring som ovan lämnats är ganska skissartad.The theoretical explanation given above is quite sketchy.
Någon noggrannare genomräkning av de dynamiska förhållandena har vi emellertid ej ansett behövlig, utan vi har nöjt oss med att konstatera genom modellförsök att, oavsett den förklaring man vill ge åt fenomenet, så uppnås likväl den uppfinningsmässiga effekten, om man förfar så som anges i nedanstående patentkrav.However, we have not considered a more accurate calculation of the dynamic conditions necessary, but we have contented ourselves with stating through model experiments that, regardless of the explanation one wants to give to the phenomenon, the inventive effect is nevertheless achieved, if one proceeds as stated below. patent claims.
Fördelarna med uppfinningen är uppenbara. Både när det gäller en matare och en sikt kommer transporthastigheten att kunna Va- rieras efter behov. Man kan vidare åstadkomma kompensering av ojämn belastning. Genom en optimering av kastvinkeln kan man vi- dare åstadkomma bättre siktverkan och bl.a. styra siktningen så att sikten på uppväg möter det uppkastade materialet vinkelrätt, varigenom bästa rensningseffekt och undvikande av pluggning upp- nås.The advantages of the invention are obvious. Both in the case of a feeder and a sieve, the transport speed can be varied as needed. Furthermore, compensation of uneven load can be achieved. By optimizing the throwing angle, it is also possible to achieve a better visibility effect and e.g. control the sieving so that the sight on the way up meets the vomited material perpendicularly, whereby the best cleaning effect and avoidance of plugging is achieved.
Claims (2)
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7809573A SE445090B (en) | 1978-09-12 | 1978-09-12 | SETTING TO ADJUST THE TURN ANGLE BY A VIBRATING DEVICE |
CA000334865A CA1139267A (en) | 1978-09-12 | 1979-08-31 | Method for regulating the throw angle of a vibrating sieve or feeder |
NL7906712A NL7906712A (en) | 1978-09-12 | 1979-09-07 | METHOD FOR CONTROLLING THE DISPLAY ANGLE OF A VIBRATOR Sieve Or Feeder |
FR7922436A FR2435972A1 (en) | 1978-09-12 | 1979-09-07 | METHOD FOR ADJUSTING THE DEVIATION ANGLE OF A SIEVE OR VIBRATING SUPPLY DEVICE |
DE19792936541 DE2936541A1 (en) | 1978-09-12 | 1979-09-10 | METHOD FOR ADJUSTING THE ANGLE MOVEMENT SIZE OF A VIBRATING SCREEN OR A VIBRATION FEEDING DEVICE |
NO792924A NO150226C (en) | 1978-09-12 | 1979-09-10 | PROCEDURE FOR ADJUSTING THE ANGLE ANGLE BY A VIBRATIVE SIGHT OR FEED |
GB7931440A GB2034437B (en) | 1978-09-12 | 1979-09-11 | Regulating the vibration of a vibrating sieve or feeder |
AT0598379A AT375282B (en) | 1978-09-12 | 1979-09-11 | METHOD FOR ADJUSTING THE ANGLE MOVEMENT SIZE OF A VIBRATION DEVICE |
DK379279A DK379279A (en) | 1978-09-12 | 1979-09-11 | PROCEDURE FOR ADJUSTING THE CASTLE ANGLE FOR A VIBRING AIM OR FEED |
FI792816A FI792816A (en) | 1978-09-12 | 1979-09-11 | SAETT FOER REGLERING AV KASTVINKELN VID EN VIBRERANDE SIKT ELLER MATARE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7809573A SE445090B (en) | 1978-09-12 | 1978-09-12 | SETTING TO ADJUST THE TURN ANGLE BY A VIBRATING DEVICE |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7809573L SE7809573L (en) | 1980-03-13 |
SE445090B true SE445090B (en) | 1986-06-02 |
Family
ID=20335800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7809573A SE445090B (en) | 1978-09-12 | 1978-09-12 | SETTING TO ADJUST THE TURN ANGLE BY A VIBRATING DEVICE |
Country Status (10)
Country | Link |
---|---|
AT (1) | AT375282B (en) |
CA (1) | CA1139267A (en) |
DE (1) | DE2936541A1 (en) |
DK (1) | DK379279A (en) |
FI (1) | FI792816A (en) |
FR (1) | FR2435972A1 (en) |
GB (1) | GB2034437B (en) |
NL (1) | NL7906712A (en) |
NO (1) | NO150226C (en) |
SE (1) | SE445090B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993023179A1 (en) * | 1992-05-19 | 1993-11-25 | Alfa Laval Separation Ab | Vibratory screening apparatus |
US5896998A (en) * | 1992-05-19 | 1999-04-27 | Alfa Laval Separation Ab | Vibratory screening apparatus |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5014564A (en) * | 1990-03-27 | 1991-05-14 | Calvest Associates | Eccentric drive mechanism |
EP0932454B1 (en) * | 1996-10-15 | 2001-12-12 | Rig Technology Limited | Improved vibratory screening machine |
US6679385B2 (en) * | 2001-04-18 | 2004-01-20 | M I Llc. | Motor control system for vibrating screen separator |
WO2015176114A1 (en) * | 2014-05-21 | 2015-11-26 | Schenck Process Australia Pty Limited | Modular exciter beam |
CN104889057B (en) * | 2015-06-23 | 2016-08-17 | 安徽理工大学 | Three Degree Of Freedom flip flop screen |
GB2573535B (en) | 2018-05-08 | 2021-05-05 | Terex Gb Ltd | Adjustable vibratory drive system |
WO2022002341A1 (en) * | 2020-06-28 | 2022-01-06 | Vibra Maschinenfabrik Schultheis Gmbh & Co. | Heavy load vortex internal apparatus for handling plastic granular material and method related thereto |
BR102020018291A2 (en) * | 2020-09-08 | 2021-04-06 | Haver & Boecker Latinoamericana Máquinas Ltda | SYSTEM, EQUIPMENT AND MONITORING PROCEDURE, PREDICTIVE MAINTENANCE AND OPERATIONAL OPTIMIZATION OF VIBRATORY SIEVES |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1098287A (en) * | 1964-12-12 | 1968-01-10 | Mueller Ludwig | Vibratory mechanism |
SE324493B (en) * | 1965-05-21 | 1970-06-01 | Schenk C Maschinenfabrik Gmbh |
-
1978
- 1978-09-12 SE SE7809573A patent/SE445090B/en not_active IP Right Cessation
-
1979
- 1979-08-31 CA CA000334865A patent/CA1139267A/en not_active Expired
- 1979-09-07 NL NL7906712A patent/NL7906712A/en not_active Application Discontinuation
- 1979-09-07 FR FR7922436A patent/FR2435972A1/en active Granted
- 1979-09-10 NO NO792924A patent/NO150226C/en unknown
- 1979-09-10 DE DE19792936541 patent/DE2936541A1/en not_active Withdrawn
- 1979-09-11 AT AT0598379A patent/AT375282B/en active
- 1979-09-11 GB GB7931440A patent/GB2034437B/en not_active Expired
- 1979-09-11 DK DK379279A patent/DK379279A/en not_active Application Discontinuation
- 1979-09-11 FI FI792816A patent/FI792816A/en not_active Application Discontinuation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993023179A1 (en) * | 1992-05-19 | 1993-11-25 | Alfa Laval Separation Ab | Vibratory screening apparatus |
US5896998A (en) * | 1992-05-19 | 1999-04-27 | Alfa Laval Separation Ab | Vibratory screening apparatus |
Also Published As
Publication number | Publication date |
---|---|
FI792816A (en) | 1980-03-13 |
DK379279A (en) | 1980-03-13 |
GB2034437B (en) | 1982-08-04 |
NO150226B (en) | 1984-06-04 |
NO150226C (en) | 1984-09-12 |
NO792924L (en) | 1980-03-13 |
FR2435972B1 (en) | 1983-11-25 |
FR2435972A1 (en) | 1980-04-11 |
SE7809573L (en) | 1980-03-13 |
GB2034437A (en) | 1980-06-04 |
ATA598379A (en) | 1983-12-15 |
AT375282B (en) | 1984-07-25 |
CA1139267A (en) | 1983-01-11 |
DE2936541A1 (en) | 1980-03-20 |
NL7906712A (en) | 1980-03-14 |
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