EP2603328B1 - Screening apparatus - Google Patents
Screening apparatus Download PDFInfo
- Publication number
- EP2603328B1 EP2603328B1 EP11741183.5A EP11741183A EP2603328B1 EP 2603328 B1 EP2603328 B1 EP 2603328B1 EP 11741183 A EP11741183 A EP 11741183A EP 2603328 B1 EP2603328 B1 EP 2603328B1
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- EP
- European Patent Office
- Prior art keywords
- members
- support
- frame
- screen
- support frame
- Prior art date
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- 238000012216 screening Methods 0.000 title claims description 25
- 239000000463 material Substances 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 11
- 230000007935 neutral effect Effects 0.000 claims description 8
- 238000013459 approach Methods 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 2
- 241001247986 Calotropis procera Species 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
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
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/48—Stretching devices for screens
- B07B1/485—Devices for alternately stretching and sagging screening surfaces
Definitions
- This invention relates to a screening apparatus for screening, grading and/or sorting granular and/or particulate material.
- a screening apparatus comprising a frame and a flexible screen attached at intervals to parallel screen supports which are mechanically driven so that adjacent supports alternately approach each other and recede from each other in such a way that the screen between them is alternatively flexed and stretched to produce stationary waves.
- Screening machines of this kind are known from US 4,600,506 and US 2,980,254 .
- the formation of stationary waves by the alternate flexing and stretching of the screen at various positions applies very high accelerations to the material being screened, assisting in separating the material and allowing particles below a certain size to pass through the screen.
- This effect is particularly marked when the screen vibrates locally between a strongly convex shape and a moderately convex or substantially flat shape, that is to say between a slack or flexed state and a taut or stretched state.
- the screen is mounted at an inclined angled so that material is conveyed down the screen under the action of gravity as it is agitated by the vibratory motion of the screen.
- this vibration of the flexible screen is obtained by mounting the screen on supports which are alternately mounted on two separate frame systems mounted to permit linear motion with respect to each other. At least one of the frame systems is typically provided with an oscillating or eccentrically mounted mass which is driven to impart a vibratory motion to the frame system.
- the frame systems are typically mounted on a base frame by means of resilient mounts so that the base frame is isolated from the vibratory motion of the frame systems.
- Such known systems generally rely on resonance to create the desired out of phase movement between the two separate frame systems to create vibratory movement of the screen.
- a screening apparatus as claimed in claim 1.
- the frame members of the first support frame may be arranged to lie between the frame members of the second support frame.
- connection means comprising an outer polygonal member provided on one of said second end of the connecting rod and said respective support frame and an inner polygonal member provided on the other of the second end of the connecting rod and the respective support frame, said inner polygonal member being located within the outer polygonal member, said inner member being angularly offset with respect to the outer member to define a plurality of chambers between the walls of the inner and outer members, one or more resilient members, such as elastomeric blocks, preferably rubber blocks, being provided in said plurality of chambers, wherein said resilient members are placed under compressive strain during pivotal movement of the connecting rod with respect to a respective one of the first and second support frames to either side of a substantially central neutral position.
- Both of said first and second support frames are coupled to the base frame via respective connecting rod journalled on a respective eccentrically arranged bearing surface of the shaft for imparting reciprocating motion to said first and second support frames, said respective bearing surfaces being angularly offset with respect to each other, preferably by 180° such that said first and second transverse members are linearly reciprocated in opposing directions.
- the first support frame is mounted on the base frame via resilient mounting means permitting linear oscillating motion of said first support frame with respect to said base frame.
- said resilient mounting means comprise elastomeric blocks mounted between the base frame and the first support frame such that the elastomeric blocks are exposed to shear strain during said linear oscillating motion of the first support frame with respect to the base frame.
- Each connection means comprises an outer polygonal member and an inner polygonal member, said inner polygonal member being located within the outer polygonal member and member being angularly offset with respect to the outer member to define a plurality of chambers between the walls of the inner and outer members, one or more resilient members, such as elastomeric blocks, preferably rubber blocks, being provided in said plurality of chambers, wherein said resilient members are placed under compressive strain during pivotal movement of the respective hanger member with respect to the first and second support frames to either side of a substantially central neutral position.
- resilient members such as elastomeric blocks, preferably rubber blocks
- a screening apparatus in accordance with a first embodiment of the present invention is s illustrated in Figures 1 to 8 and comprises a base frame 10 upon which is mounted first and second screen support frames 12,14.
- the first support frame 12 comprises a pair of parallel longitudinally arranged side beams 16,18 bridged by a plurality of mutually spaced apart first screen support members 20 extending transversely to the normal conveying direction of the material to be screened.
- the second support frame 14 comprises a pair of parallel longitudinally arranged side beams 22,24 spaced to be located on either side of the first support frame 12, said side beams 22,24 being bridged by a plurality of mutually spaced apart second screen support members 26 extending transversely to the normal conveying direction of the material to be screened, wherein the first and second support frames 12,14 are mounted on the base frame 10 such that said plurality of first screen support members 20 are interposed in alternating relationship between said plurality of second screen support members 26.
- a flexible screen 28 is attached to and carried by said plurality of first and second screen support members 20,26, said screen 28 having apertures of predetermined size to allow particles smaller than said predetermined size to pass therethough whereby particles larger than said predetermined size are retained on the screen for screening material placed on the screen.
- a discharge shoot 30 is mounted on a downstream end of the first support frame 12 for receiving material from the screen 28.
- the first support frame 12 is mounted on the base frame 10 via four rubber mounting bushes 32 respectively located adjacent each end of the each side beam 16,18 of the first support frame 12 whereby the first support frame 12 is permitted to reciprocate in a linear fashion with respect to the base frame 10, the bushes 32 being exposed to a shear strain during displacement of the first frame 12 with respect to the base frame 10 thus providing a biasing force towards a neutral central position of the first support frame 12 and absorbing the kinetic energy of the first support member 12 as it approaches its limits of movement with respect to the base frame 10.
- the second support frame 14 is suspended from the first support frame 12 by means of four elongate hanger members 34 respectively located adjacent each end of the side beams 16,18,22,24 of the first and second support frames 12,14.
- the ends of the hanger members 34 are pivotally connected to the side beams 16,18,22,24 of the first and second support frames 12,14 by connection means permitting relative movement between the first and second support frames 12,14 in the normal conveying direction of material to be screened, parallel to the longitudinal side beams 16,18,22,24 of the support frames 12,14, such that the second support frame 14 effectively swings from the first support frame 12.
- each connection means comprises concentrically mounted outer and inner member 36,38, each outer member being mounted on a side beam of a respective support frame 12,14 and each inner member being mounted on an end of a respective hanger member 34.
- Both the outer and inner members 36,38 of each connection means have a square cross section and said inner member 38 being located within the outer member 36 and member being angularly offset with respect to the outer member by 45° to define a plurality of chambers between the walls of the inner and outer members 36,38, a rubber block 40 being provided in each chamber, wherein said rubber blocks are placed under compressive strain during pivotal movement of the respective hanger member 34 with respect to the first and second support frames 12,14 to either side of a substantially central neutral position during reciprocating motion of the support frames 12,14 relative to one another.
- Such connection means are similar to those used in simple trailer and caravan suspension arms and provide a reliable, robust and hard wearing pivot function while providing a resilient biasing action and good shock absorption.
- a drive motor 42 is mounted on the base frame 10, preferably at a first end of the base frame 10 comprising an upstream end of the screening device in relation to the normal direction of travel of the material to be screened.
- An elongate shaft 44 is rotatably mounted on said first end of the base frame 10 to extend transversely across the width of the base frame 10, a drive belt (not shown) extending between respective pulleys 46,48 respectively mounted on the drive motor 42 and shaft 44 whereby the drive motor 42 can be driven to rotate the shaft 44.
- a pair of spaced apart eccentrically arranged bearing surfaces are provided at each end of the shaft 44 upon which are journalled respective connecting rods 50,52,54,56 via suitable bearings.
- An inner pair of connecting rods 52,54 are connected to respective side beams 16,18 of the first support frame 12 while an outer pair of connecting rods 50,56 are connected to respective side beams 22,24 of the second support frame 14.
- the bearing faces associated with the outer pair of connecting rods 50,56 are offset from those of the inner pair of connecting rods 52,54 other by 180° so that the first and second frame 12,14 are moved in reciprocating manner with respect to the base frame 10 in opposite directions as the shaft 44 is rotated, causing the first and second screen support members 20,26 to move relative to one another so that adjacent pairs of first and second screen support members 20,26 alternately approach each other and recede from each other in such a way that the screen 28 between them is alternatively flexed and stretched to produce stationary waves.
- Each connecting rod 50,52,54,56 is connected to a respective one of the first and second support frames 12,14 by a resilient connection means 58 similar to those used to connect the hanger members 34 to the first and second support frames 12,14.
- Each connection means 58 includes concentrically mounted inner and outer members defining chamber therebetween containing rubber blocks whereby the rubber blocks are placed under compressive strain during pivotal movement of the respective connecting rod 50,52,54,56 with respect to the first and second support frames 12,14 to either side of a substantially central neutral position during rotation of the shaft 44.
- the rubber bushes 32 act to absorb the forces applied to the base frame 10 by the first support frame 12 due to the acceleration and deceleration of the first support frame 12 under the action of the connecting rods 42,44 while the rubber blocks of the connection means of each hanger member absorb the forces applied to the first and second frame members by the connecting rods and bias the frame members towards a central neutral position.
- the base frame 10 is mounted at a suitable inclined angle with the discharge chute 30 lowermost and positioned so that material to be screened is delivered onto an upstream end of the screen 28.
- Rotation of the shaft 44 causes the connecting rods 50,52,54,56 to drive the first and second support frames 12,14 backwards and forwards with respect to one another, causing adjacent first and second screen support members 20,26 to alternately approach each other and recede from each other in such a way that the screen 28 between them is alternatively flexed and stretched to produce stationary waves.
- the rubber bushes 32 and resilient connection means of the hanger members 34 and connecting rods 50,52,54,56 act as shock absorbers, reducing the vibrations transmitted to the base frame 10 and preventing excessive loading on the components of the screening apparatus.
- a screening apparatus in accordance with a further embodiment of the present invention is illustrated in Figures 9 to 12 .
- the screening apparatus is very similar to that of the first embodiment, comprising a base frame 10 upon which is mounted first and second screen support frames 12,14.
- the screening apparatus of the second embodiment differs from the first embodiment in that it includes two vertically stacked flexible screens comprising an upper screen 28A and a lower screen 28B.
- the upper screen 28A is provided with apertures of a first predetermined size to allow particles smaller than said first predetermined size to pass therethrough, while larger particles are retained on the upper screen 28A
- the lower screen 28B is provided with apertures of a second predetermined size, smaller than said first predetermined size, to allow particles smaller than said second predetermined size to pass therethrough.
- the stacked upper and lower screens 28A,28B provided a three stage separating process, larger particles being retained on the upper screen 28A to be collected from an upper discharge chute 30A, intermediate particles being retained on the lower screen 28B to be collected from a lower discharge chute 30B and the remaining smallest particles being collected below the second screen 28B.
- the first support frame 12 comprises a pair of parallel longitudinally arranged side beams 16,18 bridged by upper and lower rows of mutually spaced apart first screen support members 20A,20B extending transversely to the normal conveying direction of the material to be screened.
- the second support frame 14 comprises a pair of parallel longitudinally arranged side beams 22,24 spaced to be located on either side of the first support frame 12, said side beams 22,24 being bridged by upper and lower rows of mutually spaced apart second screen support members 26A,26B extending transversely to the normal conveying direction of the material to be screened, wherein the first and second support frames 12,14 are mounted on the base frame 10 such that each of the upper and lower rows of first screen support members 20A,20B are interposed in alternating relationship between respective upper and lower rows of second screen support members 26A,26B.
- the upper screen 28A is attached to and carried by said upper rows of first and second screen support members 20A,28A while the lower screen 28B is attached to and carried by said lower rows of first and second screen support members 20B,28B.
- the screening apparatus of the second embodiment operates in the same way as that of the first embodiment, an electric drive motor 42 being mounted on the base frame 10 coupled to the support frames 12,14 to impart reciprocating motion to the support frames 12,14 relative to one another to produce stationary waves on each of the upper and lower flexible screens 28A,28B.
Description
- This invention relates to a screening apparatus for screening, grading and/or sorting granular and/or particulate material.
- It is known to provide a screening apparatus comprising a frame and a flexible screen attached at intervals to parallel screen supports which are mechanically driven so that adjacent supports alternately approach each other and recede from each other in such a way that the screen between them is alternatively flexed and stretched to produce stationary waves.
- Screening machines of this kind are known from
US 4,600,506 andUS 2,980,254 . The formation of stationary waves by the alternate flexing and stretching of the screen at various positions applies very high accelerations to the material being screened, assisting in separating the material and allowing particles below a certain size to pass through the screen. This effect is particularly marked when the screen vibrates locally between a strongly convex shape and a moderately convex or substantially flat shape, that is to say between a slack or flexed state and a taut or stretched state. In this vibratory movement it is important to ensure that the openings in the screen repeatedly change shape, because this tends to prevent them from becoming clogged with the material being screened and thus helps to keep them clear. Typically the screen is mounted at an inclined angled so that material is conveyed down the screen under the action of gravity as it is agitated by the vibratory motion of the screen. - In the known screening machines this vibration of the flexible screen is obtained by mounting the screen on supports which are alternately mounted on two separate frame systems mounted to permit linear motion with respect to each other. At least one of the frame systems is typically provided with an oscillating or eccentrically mounted mass which is driven to impart a vibratory motion to the frame system. The frame systems are typically mounted on a base frame by means of resilient mounts so that the base frame is isolated from the vibratory motion of the frame systems. Such known systems generally rely on resonance to create the desired out of phase movement between the two separate frame systems to create vibratory movement of the screen. However, variations in the mass of the two frame systems due to the application of varying loads on the screen and due to variations in the material to be screened makes it difficult to provide the required magnitude of relative movement between the two frame systems for a wide range of materials and often results in insufficient movement of the screen to ensure reliable operation of the screening apparatus.
- Other known screening machines are disclosed in
US 4 188 288 upon which the preamble of claim 1 is based orUS 3 378 142 ,DE 22 16 130 ,US 2008/011652 andUS 2 980 254 . - According to a first aspect of the present invention there is provided a screening apparatus as claimed in claim 1.
- Preferred embodiments of the invention are defined in the dependent claims.
- The frame members of the first support frame may be arranged to lie between the frame members of the second support frame.
- Preferably said second end of the connecting rod is connected to the respective support frame by a connection means comprising an outer polygonal member provided on one of said second end of the connecting rod and said respective support frame and an inner polygonal member provided on the other of the second end of the connecting rod and the respective support frame, said inner polygonal member being located within the outer polygonal member, said inner member being angularly offset with respect to the outer member to define a plurality of chambers between the walls of the inner and outer members, one or more resilient members, such as elastomeric blocks, preferably rubber blocks, being provided in said plurality of chambers, wherein said resilient members are placed under compressive strain during pivotal movement of the connecting rod with respect to a respective one of the first and second support frames to either side of a substantially central neutral position.
- Both of said first and second support frames are coupled to the base frame via respective connecting rod journalled on a respective eccentrically arranged bearing surface of the shaft for imparting reciprocating motion to said first and second support frames, said respective bearing surfaces being angularly offset with respect to each other, preferably by 180° such that said first and second transverse members are linearly reciprocated in opposing directions.
- The first support frame is mounted on the base frame via resilient mounting means permitting linear oscillating motion of said first support frame with respect to said base frame. Preferably said resilient mounting means comprise elastomeric blocks mounted between the base frame and the first support frame such that the elastomeric blocks are exposed to shear strain during said linear oscillating motion of the first support frame with respect to the base frame.
- Each connection means comprises an outer polygonal member and an inner polygonal member, said inner polygonal member being located within the outer polygonal member and member being angularly offset with respect to the outer member to define a plurality of chambers between the walls of the inner and outer members, one or more resilient members, such as elastomeric blocks, preferably rubber blocks, being provided in said plurality of chambers, wherein said resilient members are placed under compressive strain during pivotal movement of the respective hanger member with respect to the first and second support frames to either side of a substantially central neutral position.
- Embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-
-
Figure 1 is a side view of a screening apparatus in accordance with an embodiment of the present invention; -
Figure 2 is a plan view of the screening apparatus ofFigure 1 ; -
Figure 3 is an end view of the screening apparatus ofFigure 1 ; -
Figure 4 is a detailed view of the region marked "D" inFigure 2 ; -
Figure 5 is a further side view of the screening apparatus ofFigure 1 ; -
Figure 6 is a sectional view on line A-A ofFigure 5 ; -
Figure 7 is a detailed view of the region marked C onFigure 5 ; -
Figure 8 is a detailed sectional view of the region marked B onFigure 6 ; -
Figure 9 is a plan view of a screening apparatus in accordance with a further embodiment of the present invention; -
Figure 10 is a sectional view of the screening apparatus ofFigure 9 on line C-C; -
Figure 11 is a detailed view of region F ofFigure 10 ; and -
Figure 12 is a detailed view of region E ofFigure 10 . - A screening apparatus in accordance with a first embodiment of the present invention is s illustrated in
Figures 1 to 8 and comprises abase frame 10 upon which is mounted first and secondscreen support frames first support frame 12 comprises a pair of parallel longitudinally arrangedside beams 16,18 bridged by a plurality of mutually spaced apart firstscreen support members 20 extending transversely to the normal conveying direction of the material to be screened. Thesecond support frame 14 comprises a pair of parallel longitudinally arrangedside beams 22,24 spaced to be located on either side of thefirst support frame 12, saidside beams 22,24 being bridged by a plurality of mutually spaced apart secondscreen support members 26 extending transversely to the normal conveying direction of the material to be screened, wherein the first andsecond support frames base frame 10 such that said plurality of firstscreen support members 20 are interposed in alternating relationship between said plurality of secondscreen support members 26. - A
flexible screen 28 is attached to and carried by said plurality of first and secondscreen support members screen 28 having apertures of predetermined size to allow particles smaller than said predetermined size to pass therethough whereby particles larger than said predetermined size are retained on the screen for screening material placed on the screen. - A
discharge shoot 30 is mounted on a downstream end of thefirst support frame 12 for receiving material from thescreen 28. - The
first support frame 12 is mounted on thebase frame 10 via fourrubber mounting bushes 32 respectively located adjacent each end of the eachside beam 16,18 of thefirst support frame 12 whereby thefirst support frame 12 is permitted to reciprocate in a linear fashion with respect to thebase frame 10, thebushes 32 being exposed to a shear strain during displacement of thefirst frame 12 with respect to thebase frame 10 thus providing a biasing force towards a neutral central position of thefirst support frame 12 and absorbing the kinetic energy of thefirst support member 12 as it approaches its limits of movement with respect to thebase frame 10. - The
second support frame 14 is suspended from thefirst support frame 12 by means of fourelongate hanger members 34 respectively located adjacent each end of theside beams second support frames hanger members 34 are pivotally connected to theside beams second support frames second support frames longitudinal side beams support frames second support frame 14 effectively swings from thefirst support frame 12. - As shown in
Figure 7 , each connection means comprises concentrically mounted outer andinner member 36,38, each outer member being mounted on a side beam of arespective support frame respective hanger member 34. Both the outer andinner members 36,38 of each connection means have a square cross section and said inner member 38 being located within theouter member 36 and member being angularly offset with respect to the outer member by 45° to define a plurality of chambers between the walls of the inner andouter members 36,38, a rubber block 40 being provided in each chamber, wherein said rubber blocks are placed under compressive strain during pivotal movement of therespective hanger member 34 with respect to the first andsecond support frames support frames - A
drive motor 42 is mounted on thebase frame 10, preferably at a first end of thebase frame 10 comprising an upstream end of the screening device in relation to the normal direction of travel of the material to be screened. Anelongate shaft 44 is rotatably mounted on said first end of thebase frame 10 to extend transversely across the width of thebase frame 10, a drive belt (not shown) extending betweenrespective pulleys drive motor 42 andshaft 44 whereby thedrive motor 42 can be driven to rotate theshaft 44. - A pair of spaced apart eccentrically arranged bearing surfaces are provided at each end of the
shaft 44 upon which are journalled respective connectingrods rods respective side beams 16,18 of thefirst support frame 12 while an outer pair of connectingrods respective side beams 22,24 of thesecond support frame 14. The bearing faces associated with the outer pair of connectingrods rods second frame base frame 10 in opposite directions as theshaft 44 is rotated, causing the first and secondscreen support members screen support members screen 28 between them is alternatively flexed and stretched to produce stationary waves. - Each connecting
rod second support frames hanger members 34 to the first andsecond support frames rod second support frames shaft 44. - The
rubber bushes 32 act to absorb the forces applied to thebase frame 10 by thefirst support frame 12 due to the acceleration and deceleration of thefirst support frame 12 under the action of the connectingrods - In use, the
base frame 10 is mounted at a suitable inclined angle with thedischarge chute 30 lowermost and positioned so that material to be screened is delivered onto an upstream end of thescreen 28. Rotation of theshaft 44 causes the connectingrods second support frames screen support members screen 28 between them is alternatively flexed and stretched to produce stationary waves. - The
rubber bushes 32 and resilient connection means of thehanger members 34 and connectingrods base frame 10 and preventing excessive loading on the components of the screening apparatus. - A screening apparatus in accordance with a further embodiment of the present invention is illustrated in
Figures 9 to 12 . The screening apparatus is very similar to that of the first embodiment, comprising abase frame 10 upon which is mounted first and secondscreen support frames upper screen 28A and a lower screen 28B. Theupper screen 28A is provided with apertures of a first predetermined size to allow particles smaller than said first predetermined size to pass therethrough, while larger particles are retained on theupper screen 28A, while the lower screen 28B is provided with apertures of a second predetermined size, smaller than said first predetermined size, to allow particles smaller than said second predetermined size to pass therethrough. As such, the stacked upper andlower screens 28A,28B provided a three stage separating process, larger particles being retained on theupper screen 28A to be collected from anupper discharge chute 30A, intermediate particles being retained on the lower screen 28B to be collected from alower discharge chute 30B and the remaining smallest particles being collected below the second screen 28B. - The
first support frame 12 comprises a pair of parallel longitudinally arrangedside beams 16,18 bridged by upper and lower rows of mutually spaced apart firstscreen support members 20A,20B extending transversely to the normal conveying direction of the material to be screened. Thesecond support frame 14 comprises a pair of parallel longitudinally arrangedside beams 22,24 spaced to be located on either side of thefirst support frame 12, saidside beams 22,24 being bridged by upper and lower rows of mutually spaced apart second screen support members 26A,26B extending transversely to the normal conveying direction of the material to be screened, wherein the first andsecond support frames base frame 10 such that each of the upper and lower rows of firstscreen support members 20A,20B are interposed in alternating relationship between respective upper and lower rows of second screen support members 26A,26B. - The
upper screen 28A is attached to and carried by said upper rows of first and secondscreen support members - The screening apparatus of the second embodiment operates in the same way as that of the first embodiment, an
electric drive motor 42 being mounted on thebase frame 10 coupled to thesupport frames support frames flexible screens 28A,28B. - The invention is not limited to the embodiment(s) described herein but can be amended or modified without departing from the scope of the present invention.
Claims (6)
- A screening apparatus comprising a base frame (10);
a first support frame (12) comprising a pair of longitudinally extending frame members (16,18) bridged by a plurality of mutually spaced apart first screen support members (20) extending transversely to the conveying direction of the material to be screened;
a second support frame (14) having a pair of longitudinally extending frame members (22,24) bridged by a plurality of mutually spaced apart second screen support members (26) extending transversely to the conveying direction of the material to be screened;
said first and second support frames (12,14) being arranged such that said plurality of first screen support members (20) are interposed in alternating relationship between said plurality of second screen support members (26);
a flexible screen (28) being carried by said plurality of first and second screen support members (20,26), said screen (28) having apertures of predetermined size to allow particles smaller than said predetermined size to pass therethough whereby particles larger than said predetermined size are retained on the screen (28) for screening material placed on the screen;
a drive means (42) being provided for imparting a substantially linear reciprocating motion to the first support frame (12) with respect to the second support frame (14) to effect relative movement between said first and second screen support members (20,26), whereby adjacent pairs of said first and second screen support members (20,26) alternately approach each other and recede from each other in such a way that the screen (28) between them is alternatively flexed and stretched to produce stationary waves, wherein the drive means (42) comprises a rotatably driven shaft (44) having eccentrically arranged bearing surfaces upon which are journalled respective first ends of a respective connecting rod (50,52,54,56), a second end of the respective connecting rod (50,52,54,56) being connected to a respective one of said first and second support frames (12,14) such that rotary motion of the shaft (44) is translated into reciprocating motion of said respective support frame (12,14), wherein both of said first and second support frames (12,14) are coupled to the base frame (10) via respective connecting rods (50,52,54,56) journalled on a respective eccentrically arranged bearing surface of the shaft (44) for imparting reciprocating motion to said first and second support frames (12,14), said respective bearing surfaces being angularly offset with respect to each other, such that said first and second transverse members (20,26) are linearly reciprocated in opposing directions, characterised in that the first support frame (12) is mounted on the base frame (10) via elastomeric blocks (32) mounted between the base frame (10) and the first support frame (12) such that the elastomeric blocks (32) are exposed to shear strain during linear oscillating motion of the first support frame (12) with respect to the base frame (10), and the second support frame (14) being suspended from the first support frame (12) via a plurality of elongate hanger members (34) to allow relative movement between the first and second support frames (12,14) in the normal conveying direction of the material to be screened on the flexible screen (28), said elongate hanger members (34) extending between the longitudinally extending frame members (16,18) of the first support frame (12) and the longitudinally extending frame members (22,24) of the second support frame (14), whereby the second support frame (14) is supported by the first support frame (12), wherein upper and lower ends of each elongate hanger member (34) are pivotally connected to respective first and second support frames (12,14) by connection means permitting pivotal movement about a respective axis extending transverse to the longitudinal frame members (16,18,22,24) of the first and second support frames (12,14) and wherein each connection means comprises an outer polygonal member (36) and an inner polygonal member (38), said inner polygonal member (38) being located within the outer polygonal member (36) and being angularly offset with respect to the outer member (36) to define a plurality of chambers between the walls of the inner and outer members (38,36), one or more elastomeric blocks (40) being provided in said plurality of chambers, wherein said elastomeric blocks (40) are placed under compressive strain during pivotal movement of the respective hanger member (34) with respect to the first and second support frames (12,14) to either side of a substantially central neutral position. - An apparatus as claimed in claim 1, wherein the frame members (16,18) of the first support frame (12) are arranged to lie between the frame members (22,24) of the second support frame (14).
- An apparatus as claimed in claim 1 or claim 2, wherein the second end of each connecting rod (50,52,54,56) is connected to the respective one of said first and second support frames (12,14) by a connection means (58) comprising an outer polygonal member provided on one of said second end of the connecting rod (50,52,54,56) and said respective support frame (12,14) and an inner polygonal member provided on the other of the second end of the connecting rod (50,52,54,56) and the respective support frame (12,14), said inner polygonal member being located within the outer polygonal member, said inner member being angularly offset with respect to the outer member to define a plurality of chambers between the walls of the inner and outer members, one or more resilient members being provided in said plurality of chambers, wherein said resilient members are placed under compressive strain during pivotal movement of the connecting rod with respect to a respective one of the first and second support frames to either side of a substantially central neutral position.
- An apparatus as claimed in claim 3, wherein said resilient members comprise elastomeric blocks.
- An apparatus as claimed in claim 4, wherein said resilient members comprise rubber blocks,
- An apparatus as claimed in any preceding claim, wherein said respective bearing surfaces of the rotatably driven shaft (44) are angularly offset with respect to each other by 180° such that said first and second transverse members (20,26) are linearly reciprocated in opposing directions.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB201013373A GB2482686A (en) | 2010-08-09 | 2010-08-09 | Stationary wave separator |
PCT/EP2011/063144 WO2012019929A1 (en) | 2010-08-09 | 2011-07-29 | Screening apparatus |
Publications (2)
Publication Number | Publication Date |
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EP2603328A1 EP2603328A1 (en) | 2013-06-19 |
EP2603328B1 true EP2603328B1 (en) | 2014-12-10 |
Family
ID=42931398
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11741183.5A Active EP2603328B1 (en) | 2010-08-09 | 2011-07-29 | Screening apparatus |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2603328B1 (en) |
GB (1) | GB2482686A (en) |
WO (1) | WO2012019929A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4180134A1 (en) * | 2021-11-15 | 2023-05-17 | Johann Sedlmayer | Combustion wood cleaning device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103230868B (en) * | 2013-04-16 | 2016-02-24 | 郑州兆丰成套设备有限公司 | Drawer type powder material inspection sieve |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2980254A (en) | 1958-02-28 | 1961-04-18 | Beteiligungs & Patentverw Gmbh | Resonant oscillatory screening device |
DE1204920B (en) * | 1963-01-05 | 1965-11-11 | Albert Wehner | Sieve or conveyor machine |
DE2216130A1 (en) * | 1972-04-01 | 1973-10-04 | Albert Wehner | Oscillating sieve - with two independently oscillating frames connected to alternative drive systems |
US4188288A (en) * | 1972-11-30 | 1980-02-12 | Hein, Lehmann Ag | Screen with tubular frame systems coupled for rectilinear motion |
DE3221344C1 (en) * | 1982-06-05 | 1983-10-27 | Hein, Lehmann AG, 4000 Düsseldorf | Screening machine |
AT400533B (en) * | 1992-12-11 | 1996-01-25 | Ife Gmbh | TENSION SHAFT |
DE10016979C1 (en) * | 2000-04-06 | 2001-08-30 | Joest Gmbh & Co Kg | Sieve device, for sifting damp or sticking material, includes vibrating frame coupled to carrier frame using torsion-rod springs |
US7810648B2 (en) * | 2006-06-21 | 2010-10-12 | Tylinter, Inc. | Screen assembly for separating material according to particle size |
-
2010
- 2010-08-09 GB GB201013373A patent/GB2482686A/en not_active Withdrawn
-
2011
- 2011-07-29 WO PCT/EP2011/063144 patent/WO2012019929A1/en active Application Filing
- 2011-07-29 EP EP11741183.5A patent/EP2603328B1/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4180134A1 (en) * | 2021-11-15 | 2023-05-17 | Johann Sedlmayer | Combustion wood cleaning device |
Also Published As
Publication number | Publication date |
---|---|
WO2012019929A1 (en) | 2012-02-16 |
GB201013373D0 (en) | 2010-09-22 |
GB2482686A (en) | 2012-02-15 |
EP2603328A1 (en) | 2013-06-19 |
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