GB1604297A - Vibratory surface apparatus such as vibrating trays and screens - Google Patents
Vibratory surface apparatus such as vibrating trays and screens Download PDFInfo
- Publication number
- GB1604297A GB1604297A GB23195/78A GB2319578A GB1604297A GB 1604297 A GB1604297 A GB 1604297A GB 23195/78 A GB23195/78 A GB 23195/78A GB 2319578 A GB2319578 A GB 2319578A GB 1604297 A GB1604297 A GB 1604297A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- producing means
- vibratory motion
- vibratory
- motion producing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
- B07B1/282—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens their jigging movement being a closed or open curvilinear path in a plane perpendicular to the plane of the screen and parrallel or transverse to the direction of conveyance
Landscapes
- Jigging Conveyors (AREA)
Abstract
An oscillating trough (12) is connected to a foundation (10) by means of a spring device (14). Connected to the same foundation (10), by means of a further spring device (24), is an oscillator (16), which is also connected to the oscillating trough (12) by means of yet another spring device (22). The oscillator (16) is driven by means of one or more drive motors (18) with unbalance (19). In the case of this oscillation apparatus, essentially no oscillating forces are transferred to the foundation (10). The production costs of such an oscillation apparatus are lower than those of the known oscillation apparatuses. <IMAGE>
Description
(54) VIBRATORY SURFACE APPARATUS SUCH AS
VIBRATORY TRAYS AND SCREENS
(71) WE, POPPER ENGINEERING
LTD., an Israeli Company of 6 Ranas
Street, Kyriat Motzkin, Israel, do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to vibratory surface apparatus such as vibratory trays and screens.
Many types of vibratory screens and trays are known in the art. Two examples of such apparatus are illustrated in U.S. Patents 3,180,158 and 3,348,664. Conventional vibratory systems of this type involve a number of deficiencies. Firstly, the operation of such apparatus often involves the transmission of vibrations to the vicinity of the apparatus often causing disturbances and also resulting in constructional difficulties and constraints in the environment of the apparatus. This difficulty can be overcome sometimes at significant expense by mounting such apparatus on very soft springs.
Alternatively, such apparatus may be mounted on a relatively heavy base or dynamic dampers, i.e. spring-mounted auxiliary masses tuned to the frequency of the vibrations produced during operation, may be employed.
Further difficulties arise in connection with the operation of the drive for such vibratory apparatus which requires heavy duty bearing power transmissions and mounts to cope with the large loads. Yet another difficulty involves damping of the vibrations under large loads. It is particularly desirable that the frequency and amplitude of the vibrations not very significantly as a function of load within designed limits and that such designed limits be as broad as possible. Additionally most such vibratory surface apparatus is supported on relatively strong and high rate springs such as relatively expensive coil springs or a large number of leaf springs.
This requirement adds significantly to the cost of such apparatus.
The present invention seeks to overcome the above disadvantages and provides in a first aspect vibratory surface apparatus comprising:
a fixed base member;
vibratory motion producing means;
first spring means coupling the vibratory motion producing means to the base member;
a surface defining work member;
second spring means drivingly coupling the work member to the vibratory motion producing means, the second spring means having a finite spring constant thereby permitting substantial differential motion between the vibratory motion producing means and the work member; and
third spring means coupling the work member to the base member, the spring constants of the first, second and third spring means being selected such that substantially no vibrational forces are transmitted to the base member.
In a second aspect, the invention provides a vibratory surface apparatus for use with a fixed base member and comprising:
vibratory motion producing means;
first spring means coupled to the vibratory motion producing means and adapted for attachment to a fixed base member;
a surface defining work member adapted to be vibrated;
second spring means drivingly coupling the work member to the vibratory motion producing means, the second spring means having a finite spring constant thereby permitting substantial differential motion between the vibratory motion producing means and the work member; and
third spring means coupled to the work member and adapted for attachment to a fixed base member, the spring constants of the first, second and third spring means being selected such that when the first and third spring means are coupled to a fixed base member and the vibratory motion producing means is actuated substantially no vibrational forces are transmitted to the base member.
The invention will be more fully understood and appreciated from the following detailed description taken in conjunction with the drawings in which:
Figure 1 is a schematic illustration of a vibrating tray constructed and operative in accordance with an embodiment of the invention Figure 2 is a schematic illustration of a vibrating tray constructed and operative in accordance with another embodiment of the invention;
Figure 3 is a schematic side view illustration of sorting apparatus constructed and operative in accordance with an embodiment of the invention; and
Figure 4 is an illustration of a detail of the apparatus of Figure 3 showing the relative arrangement of two sorting surfaces thereof and the exits therefrom.
Referring now to Figure 1 there is shown a schematic illustration of a vibrating table comprising a base 10 and a tray 12 which is coupled to base 10 via spring means 14.
Means for producing vibratory motion 16, typically comprising one or more motors 18 each driving a mass 19 in eccentric motion and a mounting member 20 onto which the motors are affixed, is coupled to tray 12 by spring means 22. Vibratory motion producing means 16 is also coupled to base
10 by means of spring means 24. It should be appreciated that spring means 14, 22 and 24 each may comprise any desired number of springs which together have operational characteristics which will be described
hereinafter in greater detail.
For the purpose of discussion and later identification the following references henceforth will be employed. The spring
constant of spring means 22 will be referred to as k1, the spring constant of spring means
14 will be referred to as k2 and the spring constant of spring means 24 will be referred to as k,.
The condition under which substantially no vibrational forces are transmitted to the base is maintained when:
k2 (1)
k, o
where
a Ir-- (2) A
where
a is the amplitude of vibration of vibration
producing means 16 and
A is the amplitude of vibration of tray 12.
In order that the desired value for 71 is obtained, k1 is selected according to the following equation:
W --k2 k1- (3) 1+v where
W is the nominal weight of the tray and gx900 (4)
X292 where
g=the gravitational acceleration of the earth and
n=the rate of rotation of the driving motors 18 in units of r.p.m.
Driving motors 18 may be ordinary motors coupled to relatively small eccentric weights.
The total static moment of the eccentric
weights 19 determines the amplitude of the
tray by the following expression: Wr-Aak1(l-,ni) (5) where 71 is the displacement of the center of gravity of the weight from the axis of rotation thereof.
Thus as long as Ev is less than 1, relatively small weights may be employed, thus enabling standard motors having ordinary bearings to be used.
Since 17 is non-zero the mounting support 20 vibrates at a nonzero amplitude, a, thus synchronising the motors, in the case that more than one motor is used, and producing a relatively simple drive mechanism.
The value E is governed by the following expression:
WB - ko
Rev (7)
k where W3 is the total weight of the vibratory motion producing means 16 including mounting member 20, motors 18, and eccentric weights 19.
The quantity E also governs the change in
amplitude of the tray as a function of increase in the load on the tray.
The increase in amplitude A1 is given by the following expression:
1-9 A,=A W1 k2 0 < 4 - 11 < 1 (8) Ak, k, subject to the condition that
W, k2 0 < 4-- 1i < l aki k,
Reference is now made to Figure 2 which shows a vibrating tray constructed and operative in accordance with a preferred embodiment of the invention and comprising a base 40 onto which is coupled a tray 42 via a leaf spring 44 having a spring constant k,. Vibratory motion producing means 46, comprising one or two electric motors 48 associated with eccentric weights 50 and mounted on a supportpanel5,is coupled to tray 42 by a pair of perpendicularly oriented springs 54 of spring constant k" hereinafter referred to as kappa springs. Kappa springs are fully described in the German
Offenlegungsschrift 2721399. Vibrator motion producing means 48 is also coupled to base 40 by means of a leaf spring 58 having a spring constant ko
In practice it is desirable to keep to and k, relatively small so that any deviation from the strict equality set forth in equation 1 above does not result in large forces being transmitted to the base. It follows from equations 3 and 7 that k, must be relatively large.Thus it is desirable to employ kappa springs as described in German
Offenlegungsschrift 2721399 for this purpose in order efficiently to support the tray and the vibratory motion producing means with a minimum of expensive springs.
The base may be made of soft rubber pads if it is comparatively heavy or alternatively it may be attached rigidly to a supporting floor surface.
here the base is made of soft rubber pads it may be suspended on springs from above or below. In such a case, in order for the vibrating system to function in a desired manner i.e. having a large ratio A/a, it is necessary to select k, to be greater than or equal to'lko In the second case where the base is made relatively light and is fixed to the supporting floor it is desirable to select k2 to be less than or equal to 7wko.
It is to be understood that the weight of the vibrating system affects its cost and the related problems of transport and mounting.
It follows from equation 3 hereinabove that the value of k, is an increasing function of the weight of the tray. Thus once the desired amplitude A and frequency n of tray vibration have been selected the required quantity of spring steel becomes proportional to k,. It follows from equation 7 that a large k, requires a relatively large mounting member weight W,, thus increasing the total weight of the system.
On the basis of the above criteria it is seen to be desirable to construct a vibrating screen sorter device as illustrated in Figure 3 and 4. The sorter comprises a base 70 onto which is mounted, by means of springs 73 and 74 of spring constant k2, a structure 72.
Structure 72 comprises one of a plurality of generally superimposed screens 74 each having its own outlet 76. As seen more clearly in' Figure 4 the outlets of the respective screens may be laterally displaced from one another so as to permit a plurality of such screens to be generally superimposed within the structure 72. It is appreciated that the fineness of the mesh of the respective screen increases from the upper to the lower screen. A collection trough 80 for the smallest particles is fixedly attached to vibratory motion producing means 82 comprising one or more motors driving eccentric weights 86 and mounted on a mounting member 88. Trough 80 and means 82 are mounted onto base 70 by means of a leaf spring 90 of spring constant Ic, and also coupled to structure 72 by means of a spring 92 of spring constant k,.
It is appreciated that according to an alternative embodiment of the apparatus illustrated in Figures 3 and 4 a plurality of screens may alternatively be incorporated in addition to or in place of trough 80 and be fixedly coupled to means 82. Thus it is appreciated that the required weight WB may be realized in the form of trays, screens or troughs thereby producing countervibrating surfaces as desired.
It is to be understood that all the equations and inequalities set forth hereinabove are not necessarily precisely exact but are rather engineering approximations to the various physical situations.
It will be appreciated by persons skilled in the art that many alternative embodiments of the apparatus shown herein may also be constructed in accordance with the teachings of the present invention.
WHAT WE CLAIM IS:
1. Vibratory surface apparatus comprising:
a fixed base member;
vibratory motion producing means;
first spring means coupling the vibratory motion producing means to the base member;
a surface defining work member adapted to be vibrated;
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1-9 A,=A W1 k2 0 < 4 - 11 < 1 (8) Ak, k, subject to the condition that
W, k2 0 < 4-- 1i < l aki k,
Reference is now made to Figure 2 which shows a vibrating tray constructed and operative in accordance with a preferred embodiment of the invention and comprising a base 40 onto which is coupled a tray 42 via a leaf spring 44 having a spring constant k,. Vibratory motion producing means 46, comprising one or two electric motors 48 associated with eccentric weights 50 and mounted on a supportpanel5,is coupled to tray 42 by a pair of perpendicularly oriented springs 54 of spring constant k" hereinafter referred to as kappa springs. Kappa springs are fully described in the German
Offenlegungsschrift 2721399. Vibrator motion producing means 48 is also coupled to base 40 by means of a leaf spring 58 having a spring constant ko
In practice it is desirable to keep to and k, relatively small so that any deviation from the strict equality set forth in equation 1 above does not result in large forces being transmitted to the base. It follows from equations 3 and 7 that k, must be relatively large.Thus it is desirable to employ kappa springs as described in German
Offenlegungsschrift 2721399 for this purpose in order efficiently to support the tray and the vibratory motion producing means with a minimum of expensive springs.
The base may be made of soft rubber pads if it is comparatively heavy or alternatively it may be attached rigidly to a supporting floor surface.
here the base is made of soft rubber pads it may be suspended on springs from above or below. In such a case, in order for the vibrating system to function in a desired manner i.e. having a large ratio A/a, it is necessary to select k, to be greater than or equal to'lko In the second case where the base is made relatively light and is fixed to the supporting floor it is desirable to select k2 to be less than or equal to 7wko.
It is to be understood that the weight of the vibrating system affects its cost and the related problems of transport and mounting.
It follows from equation 3 hereinabove that the value of k, is an increasing function of the weight of the tray. Thus once the desired amplitude A and frequency n of tray vibration have been selected the required quantity of spring steel becomes proportional to k,. It follows from equation 7 that a large k, requires a relatively large mounting member weight W,, thus increasing the total weight of the system.
On the basis of the above criteria it is seen to be desirable to construct a vibrating screen sorter device as illustrated in Figure 3 and 4. The sorter comprises a base 70 onto which is mounted, by means of springs 73 and 74 of spring constant k2, a structure 72.
Structure 72 comprises one of a plurality of generally superimposed screens 74 each having its own outlet 76. As seen more clearly in' Figure 4 the outlets of the respective screens may be laterally displaced from one another so as to permit a plurality of such screens to be generally superimposed within the structure 72. It is appreciated that the fineness of the mesh of the respective screen increases from the upper to the lower screen. A collection trough 80 for the smallest particles is fixedly attached to vibratory motion producing means 82 comprising one or more motors driving eccentric weights 86 and mounted on a mounting member 88. Trough 80 and means 82 are mounted onto base 70 by means of a leaf spring 90 of spring constant Ic, and also coupled to structure 72 by means of a spring 92 of spring constant k,.
It is appreciated that according to an alternative embodiment of the apparatus illustrated in Figures 3 and 4 a plurality of screens may alternatively be incorporated in addition to or in place of trough 80 and be fixedly coupled to means 82. Thus it is appreciated that the required weight WB may be realized in the form of trays, screens or troughs thereby producing countervibrating surfaces as desired.
It is to be understood that all the equations and inequalities set forth hereinabove are not necessarily precisely exact but are rather engineering approximations to the various physical situations.
It will be appreciated by persons skilled in the art that many alternative embodiments of the apparatus shown herein may also be constructed in accordance with the teachings of the present invention.
WHAT WE CLAIM IS:
1. Vibratory surface apparatus comprising:
a fixed base member;
vibratory motion producing means;
first spring means coupling the vibratory motion producing means to the base member;
a surface defining work member adapted to be vibrated;
second spring means drivingly coupling the work member to the vibratory motion producing means, the second spring means having a finite spring constant thereby permitting substantial differential motion between the vibratory motion producing means and the work member; and
third spring means coupling the work member to the base member, the spring constants of the first, second and third spring means being selected such that substantially no vibrational forces are transmitted to the base member.
2. Vibratory surface apparatus for use with a fixed base member and comprising:
vibratory motion producing means;
first spring means coupled to the vibratory motion producing means and adapted for attachment to a fixed base member;
a surface defining work member adapted to be vibrated;
second spring means drivingly coupling the work member to the vibratory motion producing means, the second spring means having a finite spring constant thereby permitting substantial differential motion between the vibratory motion producing means and the work member; and
third spring means coupled to the work member and adapted for attachment to a fixed base member, the spring constants of the first, second and third spring means being selected such that when the first and third springs means are coupled to a fixed base member and the vibratory motion producing means is actuated substantially no vibrational forces are transmitted to the base member.
3. Apparatus according to claim 1 or 2 wherein the spring constant of the first spring means is ko; the spring constant of the second spring means is k, and the spring constant of the third spring means is k, and wherein the ratio of the amplitude of vibration of the vibration producing means to the amplitude of vibration of the first surface is equal to Ic,
o hereinafter called 17).
4. Apparatus according to claim 3 wherein the vibration producing means comprises at least one motor driving an eccentric weight and the spring constant of the second spring means is kl and is governed by the following equation:
W - - k2
a
l+17 where n is the ratio of the spring constants of the third and first spring means,
W is the nominal weight of the surfacedefining work member, and
gx900 a
7r2/172 where
g=the gravitational acceleration of the
earth and
n=the rate of rotation of the driving
motors in units of r.p.m.
5. Vibratory surface apparatus according
to any of the previous claims wherein the .member to be vibrated comprises at least
one screen mesh, the vibratory surface
apparatus also comprising a second member
adapted to be vibrated fixedly attached to
the vibratory motion producing means for
vibration together therewith.
6. Apparatus according to claim 5
wherein the first and second members
adapted to be vibrated comprise a plurality
of superimposed screens.
7. Apparatus according to any one of the
preceding claims wherein at least one of the
first, second and third spring means
comprises a kappa spring.
8. Apparatus as claimed in any preceding
claim and substantially as described
hereinabove.
9. Apparatus as claimed in any preceding
claim and substantially as shown in the
accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL52250A IL52250A0 (en) | 1977-06-06 | 1977-06-06 | Vibrating surface apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1604297A true GB1604297A (en) | 1981-12-09 |
Family
ID=11049585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23195/78A Expired GB1604297A (en) | 1977-06-06 | 1978-05-26 | Vibratory surface apparatus such as vibrating trays and screens |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU517382B2 (en) |
| CA (1) | CA1091178A (en) |
| CH (1) | CH633201A5 (en) |
| DE (1) | DE2824550A1 (en) |
| GB (1) | GB1604297A (en) |
| IL (1) | IL52250A0 (en) |
| ZA (1) | ZA783108B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005025761A1 (en) * | 2003-09-17 | 2005-03-24 | Heat And Control, Inc. | Vibratory conveyor |
| ITVR20130188A1 (en) * | 2013-08-06 | 2015-02-07 | Giuseppe Eugenio Ferrari | VIBRATING PLATE. |
| CN111482358A (en) * | 2020-05-26 | 2020-08-04 | 上海应用技术大学 | Device for sorting coating clamp marbles |
| CN112871326A (en) * | 2021-01-23 | 2021-06-01 | 马建鹏 | Chemical industry is with smashing anti-clogging device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4287056A (en) * | 1980-06-16 | 1981-09-01 | Kinergy Corporation | Sifter stroke screen |
| CN108672283A (en) * | 2018-06-26 | 2018-10-19 | 董建龙 | A kind of wrench worm screening plant of good separating effect |
-
1977
- 1977-06-06 IL IL52250A patent/IL52250A0/en unknown
-
1978
- 1978-05-26 GB GB23195/78A patent/GB1604297A/en not_active Expired
- 1978-05-30 ZA ZA00783108A patent/ZA783108B/en unknown
- 1978-05-30 AU AU36658/78A patent/AU517382B2/en not_active Expired
- 1978-05-30 CA CA304,436A patent/CA1091178A/en not_active Expired
- 1978-06-05 DE DE19782824550 patent/DE2824550A1/en not_active Withdrawn
- 1978-06-05 CH CH614478A patent/CH633201A5/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005025761A1 (en) * | 2003-09-17 | 2005-03-24 | Heat And Control, Inc. | Vibratory conveyor |
| AU2003260175B2 (en) * | 2003-09-17 | 2006-01-05 | Heat And Control, Inc. | Vibratory conveyor |
| ITVR20130188A1 (en) * | 2013-08-06 | 2015-02-07 | Giuseppe Eugenio Ferrari | VIBRATING PLATE. |
| EP2835183A1 (en) * | 2013-08-06 | 2015-02-11 | Luigi Alberto Ferrari | Vibrating plate |
| CN111482358A (en) * | 2020-05-26 | 2020-08-04 | 上海应用技术大学 | Device for sorting coating clamp marbles |
| CN112871326A (en) * | 2021-01-23 | 2021-06-01 | 马建鹏 | Chemical industry is with smashing anti-clogging device |
Also Published As
| Publication number | Publication date |
|---|---|
| AU3665878A (en) | 1979-12-06 |
| DE2824550A1 (en) | 1978-12-14 |
| ZA783108B (en) | 1979-06-27 |
| CH633201A5 (en) | 1982-11-30 |
| CA1091178A (en) | 1980-12-09 |
| IL52250A0 (en) | 1977-08-31 |
| AU517382B2 (en) | 1981-07-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |