EP3332879A1 - Vibrating screen - Google Patents
Vibrating screen Download PDFInfo
- Publication number
- EP3332879A1 EP3332879A1 EP16202690.0A EP16202690A EP3332879A1 EP 3332879 A1 EP3332879 A1 EP 3332879A1 EP 16202690 A EP16202690 A EP 16202690A EP 3332879 A1 EP3332879 A1 EP 3332879A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- box
- main surface
- vibrating
- shaped reinforcing
- reinforcing structure
- 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.)
- Granted
Links
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 53
- 238000012216 screening Methods 0.000 claims abstract description 23
- 230000001419 dependent effect Effects 0.000 claims 2
- 230000001133 acceleration Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 239000011796 hollow space material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- 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
- B07B1/36—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro in more than one direction
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- 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
-
- 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
- B07B1/284—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens with unbalanced weights
Definitions
- This invention relates to a vibrating screen of the type comprising a base positioned in a lower part and a vibrating structure positioned in an upper part, with a plurality of elastic elements interposed between them, for connecting them and allowing the vibrating structure to elastically oscillate relative to the base.
- a vibrating unit is mounted on the vibrating structure to make the latter vibrate relative to the base.
- the upper structure comprises a plurality of sieves that are angled or parallel relative to a horizontal plane. They are positioned in such a way as to cause the outfeed of the material divided into different particle size measurement ranges.
- this invention can be applied for vibrating screens intended for selecting aggregates to be used in applications such as the production of bituminous macadams and the production of concretes.
- the screen In order to be able to achieve high levels of productivity and good screening results, on one hand the screen must have relatively large dimensions and on the other hand a suitable vibration and acceleration must be imparted to it, which may therefore reach even very high values (preferably using a small slope for the various sieves).
- Patent application EP 1 719 560 A2 which relates to the same type of screens as this invention, gives a rapid overview of known vibrating screen sizing and design problems.
- the vibrating structure comprises two mainly flat walls constituted of a single metal plate that is relatively thick
- patent application EP 1 719 560 A2 proposed an embodiment in which the walls are at least partly constituted of two plate sheets positioned side by side and close to each other for forming a narrow hollow space between them.
- a plurality of interconnecting elements is present in the hollow space.
- the two plate sheets also have different thicknesses. Preferably, one of the two sheets is twice as thick as the other.
- the wall only comprises two sheets in the upper half, whilst only the outer sheet is present in the lower half.
- the beam that supports the vibrating unit is connected only to the outer sheets of the two walls.
- patent application EP 1 719 560 A2 suggests that the previously known screens be changed by applying on the upper part of the inner side of each wall a reinforcement constituted of an additional plate sheet drawn near to the self-same wall and connected to it by means of various elements.
- patent application EP 1 719 560 A2 boasts presumed advantages of the embodiment which forms its subject matter compared with prior art screens, on one hand as yet there are no known industrial applications that can effectively demonstrate actual achievement of such advantages, and on the other hand it has several obvious disadvantages at a construction level.
- the disadvantages are first linked to the need to apply a second plate sheet on the inner side of the vibrating structure, while leaving the structural functions (such as sustaining the beam that supports the vibrating unit or sustaining the sieves) to be performed by only the outer plate.
- the inner plate has to be prepared with a whole series of openings to allow the passage of the beam and of the supporting elements for the sieves.
- the technical purpose which forms the basis of this invention is to provide a vibrating screen which overcomes the above-mentioned disadvantages.
- the technical purpose of this invention is to provide a vibrating screen with simple construction and that has a structural rigidity considerably greater than the screens currently on the market and which can, therefore, be made to operate with performance that is better than the performance of prior art screens.
- the numeral 1 denotes in its entirety a vibrating screen according to this invention.
- the screen that forms the subject matter of this invention comprises a base 2 positioned in a lower part, a vibrating structure 3 positioned in an upper part, and a plurality of elastic elements 4 interposed between the base 2 and the vibrating structure 3 for connecting them and allowing the vibrating structure 3 to elastically oscillate relative to the base 2.
- At least one vibrating unit 5 is mounted on the vibrating structure 3 for, in use, causing the vibrating structure 3 to vibrate relative to the base 2.
- the vibrating unit 5 is of the mechanical type with eccentric rotating masses. But in general, it may be made in any way suitable for the purpose. However, preferably, it is a vibrating unit 5 able to generate reciprocating vibration. In the known way, it is also advantageously mounted in the highest part of the vibrating structure 3.
- the vibrating structure 3 in turn comprises a supporting frame 6 which supports a plurality of screening elements 7 (typically perforated plates or nets that act as a sieve).
- the screening elements 7 are positioned on multiple levels one above the other and are vertically spaced.
- a screening element 7 positioned at one level comprises screening openings having a size smaller than those of the screening elements 7 positioned at the higher levels. In this way, the screen causes division of the various particle size measurements of the aggregates being processed on the different levels with decreasing size from top to bottom.
- the screening elements 7 are each supported by a plurality of elongate supporting elements 8 positioned substantially horizontally and perpendicular to a main line of extension of the vibrating screen 1 (the length in the accompanying figures).
- the elongate supporting elements 8 of each screening element 7 are also positioned in such a way that the respective screening element 7 has a predetermined slope from the infeed section 9 of the vibrating screen 1 located near to one of the smaller sides, towards the outfeed section 10 located at the other small side ( Figure 4 ).
- the supporting frame 6 comprises two lateral walls 11. Each lateral wall 11 comprises an inner main surface 12 facing towards the other lateral wall 11, and an outer main surface 13 positioned on the opposite side to the inner main surface 12.
- the screening elements 7 are positioned between the inner main surfaces 12.
- the elongate supporting elements 8 are fixed to the lateral walls 11 at the inner main surfaces 12.
- the vibrating structure 3 also comprises a load-bearing beam 14, which is rigidly interconnected between the lateral walls 11 and which extends horizontally above all of the screening elements 7.
- the vibrating unit 5 is advantageously mounted on the load-bearing beam 14.
- the load-bearing beam 14 is fixed to the lateral walls 11 at supporting portions 15 of the related inner main surfaces 12.
- the supporting frame 6 comprises at least one box-shaped reinforcing structure 16 that is hollow inside and that is applied to the outer main surface 13 of the related lateral wall 11.
- each box-shaped reinforcing structure 16 is applied exclusively to a limited part 17 of the related outer main surface 13, in particular to a limited part 17 of the outer main surface 13 that forms at least one ring surrounding a portion of the self-same outer main surface 13 to which, in contrast, the box-shaped reinforcing structure 16 is not applied.
- each outer main surface 13 may form either a single ring 18 or a plurality of rings 18 that each surround a portion of the self-same outer main surface 13 to which the box-shaped reinforcing structure 16 is not applied.
- each box-shaped reinforcing structure 16 in turn also has a shape that forms at least one ring 18 (only one in Figures 7 and 10 , but five in Figure 9 ).
- the reinforcing structure may be located only on part of the respective lateral wall 11 (in the upper part in Figure 7 ) or may affect the entire lateral wall as in Figures 9 and 10 .
- the box-shaped reinforcing structure 16 is present at supporting flanges 19 by means of which the vibrating structure 3 is connected to the elastic elements 4, and/or to the zones of the outer main surfaces 13 positioned at the supporting portions 15 made on the inner main surfaces 12. Those zones are therefore part of the respective limited part 17 of the outer main surface 13 that forms at least one ring 18.
- each box-shaped reinforcing structure 16 is connected to the related lateral wall 11 by means of a plurality of bolts 20.
- at least several bolts 20 connect the box-shaped reinforcing structure 16 both to the related lateral wall 11 and to one of the elongate supporting elements 8 of at least one screening element 7.
- two or more bolts 20 connect the box-shaped reinforcing structure 16 to the same elongate supporting element 8.
- the box-shaped reinforcing structure 16 internally comprises a tubular insert 21 extending perpendicularly to a main plane of extension of the lateral wall 11, the bolt 20 being positioned through the inside of this insert.
- the tubular insert 21 is welded to the rest of the box-shaped reinforcing structure 16.
- each box-shaped reinforcing structure 16 in the preferred embodiment illustrated in the accompanying figures it comprises first a main reinforcing body 22 which, in a plane perpendicular to the main plane of extension of the outer main surface 13, has a C-shaped cross-section (the shape and the size of the C may vary from one zone to the next).
- the central part of the C is applied to the related outer main surface 13 whilst the two arms of the C extend substantially perpendicularly to, and away from, the main plane of extension of the related outer main surface 13.
- the box-shaped reinforcing structure 16 also comprises at least one closing element 23 applied to the main reinforcing body 22 so that together with the latter it forms a box-shaped element. Seen in cross-section, as in Figure 8 , the closing element 23 is fixed to the arms of the C advantageously by welding.
- both the main reinforcing body 22 and the closing element 23 may be made either as one piece or as a plurality of pieces that are drawn near each other and interconnected if necessary.
- each box-shaped reinforcing structure 16 may comprise a plurality of stiffening walls 24 mounted inside the main reinforcing body 22 and welded to it.
- the stiffening walls 24 extend perpendicularly to the related outer main surface 13, preferably from one arm of the C to the opposite arm.
- the box-shaped reinforcing structure 16 comprises a plurality of stiffening walls 24 that are angled relative to one another and constrained to each other in order to form a stiffening frame 25, at the supporting flanges 19 and/or at the zones of the outer main surfaces 13 positioned at the supporting portions 15 made on the inner main surfaces 12.
- the thicknesses of the various parts of the box-shaped reinforcing structure 16 may be different to one another (for example, in the same box-shaped reinforcing structure 16, 3 mm, 5 mm and 14 mm thicknesses may be used simultaneously).
Landscapes
- Combined Means For Separation Of Solids (AREA)
Abstract
Description
- This invention relates to a vibrating screen of the type comprising a base positioned in a lower part and a vibrating structure positioned in an upper part, with a plurality of elastic elements interposed between them, for connecting them and allowing the vibrating structure to elastically oscillate relative to the base. A vibrating unit is mounted on the vibrating structure to make the latter vibrate relative to the base. The upper structure comprises a plurality of sieves that are angled or parallel relative to a horizontal plane. They are positioned in such a way as to cause the outfeed of the material divided into different particle size measurement ranges.
- In particular, this invention can be applied for vibrating screens intended for selecting aggregates to be used in applications such as the production of bituminous macadams and the production of concretes.
- In order to be able to achieve high levels of productivity and good screening results, on one hand the screen must have relatively large dimensions and on the other hand a suitable vibration and acceleration must be imparted to it, which may therefore reach even very high values (preferably using a small slope for the various sieves).
- Patent application
EP 1 719 560 A2 , which relates to the same type of screens as this invention, gives a rapid overview of known vibrating screen sizing and design problems. - As indicated in that patent application, in particular, without changing the overall structure too much, in order to be able to increase the performance of the vibrating screens, it would be necessary to pursue two contradictory courses of action. In fact, whilst on one hand it would be necessary to considerably stiffen their structure, on the other hand it would be appropriate to reduce their mass.
- Whilst in traditional vibrating screens the vibrating structure comprises two mainly flat walls constituted of a single metal plate that is relatively thick, in an attempt to improve performance, patent application
EP 1 719 560 A2 proposed an embodiment in which the walls are at least partly constituted of two plate sheets positioned side by side and close to each other for forming a narrow hollow space between them. A plurality of interconnecting elements is present in the hollow space. The two plate sheets also have different thicknesses. Preferably, one of the two sheets is twice as thick as the other. - Moreover, according to that document, the wall only comprises two sheets in the upper half, whilst only the outer sheet is present in the lower half. The beam that supports the vibrating unit is connected only to the outer sheets of the two walls.
- Therefore, in other words, patent application
EP 1 719 560 A2 suggests that the previously known screens be changed by applying on the upper part of the inner side of each wall a reinforcement constituted of an additional plate sheet drawn near to the self-same wall and connected to it by means of various elements. - Although patent application
EP 1 719 560 A2 boasts presumed advantages of the embodiment which forms its subject matter compared with prior art screens, on one hand as yet there are no known industrial applications that can effectively demonstrate actual achievement of such advantages, and on the other hand it has several obvious disadvantages at a construction level. - In particular, the disadvantages are first linked to the need to apply a second plate sheet on the inner side of the vibrating structure, while leaving the structural functions (such as sustaining the beam that supports the vibrating unit or sustaining the sieves) to be performed by only the outer plate. In fact, to do that, the inner plate has to be prepared with a whole series of openings to allow the passage of the beam and of the supporting elements for the sieves. Moreover, inevitably, the presence of two sheets on the inner sides of the walls, however close they may be to the outer sheets, reduces the working width of the sieves.
- Moreover, tests and simulation performed by the Applicant have allowed it to be established that the solution described in that patent application would not, in reality, be able to achieve the vibrating structure rigidity results claimed.
- In this context the technical purpose which forms the basis of this invention is to provide a vibrating screen which overcomes the above-mentioned disadvantages.
- In particular, the technical purpose of this invention is to provide a vibrating screen with simple construction and that has a structural rigidity considerably greater than the screens currently on the market and which can, therefore, be made to operate with performance that is better than the performance of prior art screens.
- The technical purpose specified and the aims indicated are substantially achieved by a vibrating screen made as described in the appended claims.
- Further features and the advantages of this invention are more apparent in the detailed description, with reference to the accompanying drawings which illustrate several preferred, non-limiting embodiments of a vibrating screen, in which:
-
Figure 1 is a schematic side view of a vibrating screen made in accordance with this invention; -
Figure 2 is an axonometric view of a vibrating structure of the screen ofFigure 1 , longitudinally sectioned at a middle plane of it; -
Figure 3 is an axonometric view of the sectioned vibrating structure ofFigure 2 from an opposite viewpoint; -
Figure 4 is a side view of the sectioned vibrating structure ofFigure 2 , highlighting with dashed lines a plurality of screening elements; -
Figure 5 is a side view of the sectioned vibrating structure ofFigure 2 , highlighting in transparency several inner reinforcing parts; -
Figure 6 is an axonometric view of a box-shaped reinforcing structure of the vibrating structure ofFigure 3 ; -
Figure 7 is a side view of the box-shaped reinforcing structure ofFigure 6 , highlighting with dashed lines the inner parts; -
Figure 8 is a schematic cross-section of a preferred form of the box-shaped reinforcing structure; and -
Figures 9 and 10 are side views of two alternative embodiments of the vibrating structure, highlighting with dashed lines possible limited zones of application of a box-shaped reinforcing structure. - With reference to the above-mentioned figures, the numeral 1 denotes in its entirety a vibrating screen according to this invention.
- Similarly to prior art screens, even the screen that forms the subject matter of this invention comprises a
base 2 positioned in a lower part, avibrating structure 3 positioned in an upper part, and a plurality ofelastic elements 4 interposed between thebase 2 and thevibrating structure 3 for connecting them and allowing thevibrating structure 3 to elastically oscillate relative to thebase 2. In the preferred embodiment, in particular, there are fourelastic elements 4 positioned at the four vertices of a rectangle, each of which comprises one or more helical springs placed side by side. - At least one vibrating
unit 5 is mounted on the vibratingstructure 3 for, in use, causing the vibratingstructure 3 to vibrate relative to thebase 2. In the preferred embodiment the vibratingunit 5 is of the mechanical type with eccentric rotating masses. But in general, it may be made in any way suitable for the purpose. However, preferably, it is a vibratingunit 5 able to generate reciprocating vibration. In the known way, it is also advantageously mounted in the highest part of the vibratingstructure 3. - The vibrating
structure 3 in turn comprises a supportingframe 6 which supports a plurality of screening elements 7 (typically perforated plates or nets that act as a sieve). Thescreening elements 7 are positioned on multiple levels one above the other and are vertically spaced. Moreover, ascreening element 7 positioned at one level comprises screening openings having a size smaller than those of thescreening elements 7 positioned at the higher levels. In this way, the screen causes division of the various particle size measurements of the aggregates being processed on the different levels with decreasing size from top to bottom. - Advantageously, the
screening elements 7 are each supported by a plurality of elongate supportingelements 8 positioned substantially horizontally and perpendicular to a main line of extension of the vibrating screen 1 (the length in the accompanying figures). The elongate supportingelements 8 of eachscreening element 7 are also positioned in such a way that therespective screening element 7 has a predetermined slope from the infeedsection 9 of the vibrating screen 1 located near to one of the smaller sides, towards theoutfeed section 10 located at the other small side (Figure 4 ). - The supporting
frame 6 comprises twolateral walls 11. Eachlateral wall 11 comprises an innermain surface 12 facing towards the otherlateral wall 11, and an outermain surface 13 positioned on the opposite side to the innermain surface 12. Thescreening elements 7 are positioned between the innermain surfaces 12. Moreover, in the embodiment illustrated, the elongate supportingelements 8 are fixed to thelateral walls 11 at the innermain surfaces 12. - The vibrating
structure 3 also comprises a load-bearingbeam 14, which is rigidly interconnected between thelateral walls 11 and which extends horizontally above all of thescreening elements 7. The vibratingunit 5 is advantageously mounted on the load-bearingbeam 14. In particular, the load-bearingbeam 14 is fixed to thelateral walls 11 at supportingportions 15 of the related innermain surfaces 12. - Moreover, according to a first innovative aspect of this invention, for each
lateral wall 11 the supportingframe 6 comprises at least one box-shaped reinforcing structure 16 that is hollow inside and that is applied to the outermain surface 13 of the relatedlateral wall 11. - According to the preferred embodiment of this invention, each box-
shaped reinforcing structure 16 is applied exclusively to alimited part 17 of the related outermain surface 13, in particular to alimited part 17 of the outermain surface 13 that forms at least one ring surrounding a portion of the self-same outermain surface 13 to which, in contrast, the box-shaped reinforcing structure 16 is not applied. - Depending on the embodiments, that limited
part 17 of each outermain surface 13 may form either asingle ring 18 or a plurality ofrings 18 that each surround a portion of the self-same outermain surface 13 to which the box-shaped reinforcing structure 16 is not applied. - Therefore, seen from the side (as in
Figures 7 ,9 and 10 ), each box-shaped reinforcing structure 16 in turn also has a shape that forms at least one ring 18 (only one inFigures 7 and10 , but five inFigure 9 ). Depending on the embodiments, the reinforcing structure may be located only on part of the respective lateral wall 11 (in the upper part inFigure 7 ) or may affect the entire lateral wall as inFigures 9 and 10 . - Moreover, advantageously, the box-
shaped reinforcing structure 16 is present at supportingflanges 19 by means of which the vibratingstructure 3 is connected to theelastic elements 4, and/or to the zones of the outermain surfaces 13 positioned at the supportingportions 15 made on the innermain surfaces 12. Those zones are therefore part of the respectivelimited part 17 of the outermain surface 13 that forms at least onering 18. - In the preferred embodiment, each box-
shaped reinforcing structure 16 is connected to the relatedlateral wall 11 by means of a plurality ofbolts 20. In particular, advantageously, for each box-shaped reinforcing structure 16, at leastseveral bolts 20 connect the box-shaped reinforcing structure 16 both to the relatedlateral wall 11 and to one of the elongate supportingelements 8 of at least onescreening element 7. In particular, in the preferred embodiment, two ormore bolts 20 connect the box-shaped reinforcing structure 16 to the same elongate supportingelement 8. - Also, preferably, at least several, but preferably all of the
bolts 20 completely pass through the related box-shaped reinforcingstructure 16. Furthermore, in this case, advantageously, at least for several of thebolts 20 that completely pass through the box-shaped reinforcingstructure 16, the box-shaped reinforcingstructure 16 internally comprises atubular insert 21 extending perpendicularly to a main plane of extension of thelateral wall 11, thebolt 20 being positioned through the inside of this insert. Advantageously, thetubular insert 21 is welded to the rest of the box-shaped reinforcingstructure 16. - As regards the form of each box-shaped reinforcing
structure 16, in the preferred embodiment illustrated in the accompanying figures it comprises first a main reinforcingbody 22 which, in a plane perpendicular to the main plane of extension of the outermain surface 13, has a C-shaped cross-section (the shape and the size of the C may vary from one zone to the next). In particular, the central part of the C is applied to the related outermain surface 13 whilst the two arms of the C extend substantially perpendicularly to, and away from, the main plane of extension of the related outermain surface 13. The box-shaped reinforcingstructure 16 also comprises at least oneclosing element 23 applied to the main reinforcingbody 22 so that together with the latter it forms a box-shaped element. Seen in cross-section, as inFigure 8 , the closingelement 23 is fixed to the arms of the C advantageously by welding. - To allow the passage of the
bolts 20, suitable through holes are made in the main reinforcingbody 22, the closingelement 23, thelateral wall 11 and if necessary in the elongate element. - In general, both the main reinforcing
body 22 and theclosing element 23 may be made either as one piece or as a plurality of pieces that are drawn near each other and interconnected if necessary. - Depending on requirements and on the shape of the box-shaped reinforcing
structure 16, there may be additional reinforcing and/or stiffening elements inside it. - For example, each box-shaped reinforcing
structure 16 may comprise a plurality of stiffeningwalls 24 mounted inside the main reinforcingbody 22 and welded to it. Advantageously, the stiffeningwalls 24 extend perpendicularly to the related outermain surface 13, preferably from one arm of the C to the opposite arm. - Furthermore, advantageously, the box-shaped reinforcing
structure 16 comprises a plurality of stiffeningwalls 24 that are angled relative to one another and constrained to each other in order to form astiffening frame 25, at the supportingflanges 19 and/or at the zones of the outermain surfaces 13 positioned at the supportingportions 15 made on the innermain surfaces 12. - Depending on requirements, the thicknesses of the various parts of the box-shaped reinforcing
structure 16 may be different to one another (for example, in the same box-shaped reinforcingstructure - Operation of the screen according to this invention is similar to that of conventional screens.
- However, this invention brings important advantages.
- Preliminary checks and tests carried out by the Applicant allowed it to be established that thanks to this invention it is possible to significantly increase the performance of a vibrating screen.
- Moreover, it was possible to increase the structural resistance to fatigue of the screen without excessively altering its mass.
- In particular, by applying a box-shaped reinforcing structure such as that in the figures to an existing vibrating screen having the following limit performance values (dictated by mechanical resistance):
- maximum acceleration achievable 4.8 g (where g, obviously, indicates the acceleration of gravity);
- mass (screen + material) 3446 kg;
- maximum intensity of the sinusoidal force applicable by the vibrating unit 85 kN;
it has been possible to increase those limit performance values to the following values: - maximum acceleration achievable 12 g;
- mass (screen + material) 5240 kg;
- maximum intensity of the sinusoidal force applicable by the vibrating unit 220 kN.
- Finally, it should be noticed that this invention is relatively easy to produce and that even the cost linked to implementing the invention is not very high. The invention described above may be modified and adapted in several ways without thereby departing from the scope of the inventive concept.
- All details may be substituted with other technically equivalent elements and the materials used, as well as the shapes and dimensions of the various components, may vary according to requirements.
Claims (12)
- A vibrating screen comprising:a base (2) positioned in a lower part;a vibrating structure (3) positioned in an upper part;a plurality of elastic elements (4) interposed between the base (2) and the vibrating structure (3) for connecting them and allowing the vibrating structure (3) to elastically oscillate relative to the base (2); andat least one vibrating unit (5) mounted on the vibrating structure (3);wherein:the vibrating structure (3) in turn comprises a supporting frame (6) on which a plurality of screening elements (7) is mounted, the screening elements being arranged on multiple levels one above another and vertically spaced, a screening element (7) positioned at one level comprising screening openings having a size smaller than those of the screening elements (7) positioned at higher levels;the supporting frame (6) comprises two lateral walls (11) and, for each lateral wall (11), at least one box-shaped reinforcing structure (16) applied to that lateral wall;the lateral walls (11) each comprising an inner main surface (12) facing towards the other lateral wall (11) and an outer main surface (13) positioned on the opposite side to the inner main surface (12), the screening elements (7) being positioned between the inner main surfaces (12); andeach box-shaped reinforcing structure (16) being hollow inside and being applied to the outer main surface (13) of the related lateral wall (11).
- The vibrating screen according to claim 1, characterised in that each box-shaped reinforcing structure (16) is applied exclusively to a limited part (17) of the related outer main surface (13).
- The vibrating screen according to claim 2, characterised in that said limited part (17) of each outer main surface (13) forms at least one ring (18) surrounding a portion of the self-same outer main surface (13) to which the box-shaped reinforcing structure (16) is not applied.
- The vibrating screen according to claim 3, characterised in that said limited part (17) of each outer main surface (13) forms a plurality of rings (18) each surrounding a portion of the self-same outer main surface (13) to which the box-shaped reinforcing structure (16) is not applied.
- The vibrating screen according to any of the preceding claims, characterised in that the vibrating structure (3) also comprises a load-bearing beam (14), rigidly interconnected between the lateral walls (11) and extending horizontally above all of the screening elements (7), the vibrating unit (5) being mounted on the load-bearing beam (14).
- The vibrating screen according to claim 5 when it is dependent on claim 3, characterised in that the load-bearing beam (14) is fixed to the lateral walls (11) at supporting portions (15) of the related inner main surfaces (12), and in that on each outer main surface (13), at said supporting portions (15), it is possible to identify a zone that is part of said limited part (17) that forms at least one ring (18), and to which the box-shaped reinforcing structure (16) is applied.
- The vibrating screen according to any of the preceding claims, characterised in that each box-shaped reinforcing structure (16) is connected to the related lateral wall (11) by means of a plurality of bolts (20).
- The vibrating screen according to claim 7, characterised in that for each box-shaped reinforcing structure (16), at least several bolts (20) connect the box-shaped reinforcing structure (16) both to the related lateral wall (11) and to an elongate supporting element that rigidly connects the inner main surfaces to each other and supports at least one screening element (7).
- The vibrating screen according to claim 7 or 8, characterised in that at least several of said bolts (20) completely pass through the related box-shaped reinforcing structure (16), and in that, at least for several of the bolts (20) that completely pass through it, the box-shaped reinforcing structure (16) also comprises, for each bolt (20), at least one tubular insert (21) that extends perpendicularly to a main plane of extension of the lateral wall (11) and inside which the bolt (20) is positioned.
- The vibrating screen according to any of the preceding claims, characterised in that each box-shaped reinforcing structure (16) comprises a main reinforcing body (22) that, in a plane perpendicular to a main plane of extension of the outer main surface (13), is C-shaped with a central part of the C applied to the related outer main surface (13) and arms of the C extending substantially perpendicularly to, and away from, the main plane of extension of the related outer main surface (13), and at least one closing element (23) applied to the main reinforcing body (22) between the arms of the C.
- The vibrating screen according to claim 10, characterised in that each box-shaped reinforcing structure (16) also comprises a plurality of stiffening walls (24) mounted inside the main reinforcing body (22) and welded to it, the stiffening walls (24) extending perpendicularly to the related outer main surface.
- The vibrating screen according to claim 11 when it is dependent on claim 6, characterised in that each reinforcing structure comprises a plurality of stiffening walls (24) at the related supporting portion of the inner main surface (12), the stiffening walls (24) of said plurality being angled relative to one another and constrained to each other in order to form a stiffening frame (25).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES16202690T ES2842200T3 (en) | 2016-12-07 | 2016-12-07 | Vibrating screen |
DK16202690.0T DK3332879T3 (en) | 2016-12-07 | 2016-12-07 | VIBRATION VIEW |
EP16202690.0A EP3332879B1 (en) | 2016-12-07 | 2016-12-07 | Vibrating screen |
Applications Claiming Priority (1)
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EP16202690.0A EP3332879B1 (en) | 2016-12-07 | 2016-12-07 | Vibrating screen |
Publications (2)
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EP3332879A1 true EP3332879A1 (en) | 2018-06-13 |
EP3332879B1 EP3332879B1 (en) | 2020-11-04 |
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EP16202690.0A Active EP3332879B1 (en) | 2016-12-07 | 2016-12-07 | Vibrating screen |
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EP (1) | EP3332879B1 (en) |
DK (1) | DK3332879T3 (en) |
ES (1) | ES2842200T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109433577A (en) * | 2018-12-21 | 2019-03-08 | 嘉兴市日丰金属制品有限公司 | A kind of multilevel hierarchy screening frame |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2134214A (en) * | 1983-01-28 | 1984-08-08 | Kinergy Corp | Sifter stroke screening unit |
EP1719560A2 (en) | 2005-05-04 | 2006-11-08 | Bernardi Impianti International S.P.A. | High-performance vibration screen |
EP1946851A1 (en) * | 2007-01-17 | 2008-07-23 | Haver & Boecker oHG | Reciprocating screen machine |
US20120111774A1 (en) * | 2010-11-08 | 2012-05-10 | Terex Usa, Llc | Vibrating screen suspension systems |
EP2850938A1 (en) * | 2013-09-20 | 2015-03-25 | Deere & Company | Hanger mount for a reciprocating sieve |
-
2016
- 2016-12-07 ES ES16202690T patent/ES2842200T3/en active Active
- 2016-12-07 EP EP16202690.0A patent/EP3332879B1/en active Active
- 2016-12-07 DK DK16202690.0T patent/DK3332879T3/en active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2134214A (en) * | 1983-01-28 | 1984-08-08 | Kinergy Corp | Sifter stroke screening unit |
EP1719560A2 (en) | 2005-05-04 | 2006-11-08 | Bernardi Impianti International S.P.A. | High-performance vibration screen |
EP1946851A1 (en) * | 2007-01-17 | 2008-07-23 | Haver & Boecker oHG | Reciprocating screen machine |
US20120111774A1 (en) * | 2010-11-08 | 2012-05-10 | Terex Usa, Llc | Vibrating screen suspension systems |
EP2850938A1 (en) * | 2013-09-20 | 2015-03-25 | Deere & Company | Hanger mount for a reciprocating sieve |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109433577A (en) * | 2018-12-21 | 2019-03-08 | 嘉兴市日丰金属制品有限公司 | A kind of multilevel hierarchy screening frame |
Also Published As
Publication number | Publication date |
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EP3332879B1 (en) | 2020-11-04 |
DK3332879T3 (en) | 2021-01-11 |
ES2842200T3 (en) | 2021-07-13 |
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