Processing

Please wait...

Settings

Settings

Goto Application

1. WO2007093645 - A MATERIAL SCREENING APPARATUS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS:

1. A mobile material screening apparatus for separating bulk particulate material into groups of particles of differing sizes, the apparatus comprising:

a support chassis;

a horizontal screen box apparatus, the horizontal screen box mounted on the support chassis and having an upper screen deck and a lower screen deck;

an additional pre-screening module, wherein the pre-screening module is provided with an upper inclined screen and a lower inclined screen and wherein the pre- screening module is provided with an upper conveyor and lower conveyor, the upper and lower conveyors being arranged parallel to the upper inclined screen and a lower inclined screen, the upper conveyor being adapted to convey material to the pre-screening module screens and the lower conveyor being adapted to transfer material from the pre-screening module to the horizontal screen box apparatus;

whereby the arrangement of the apparatus is such as to provide for five different grades of material as output from the apparatus, namely reject unscreened material and four different grades of screened material.

2. A mobile material screening apparatus as claimed in Claim 1 , wherein the pre-screening module is pivotable and is provided with a means of altering the inclination angle of the pre-screening module and a means of raising the module to a horizontal stowed position to facilitate transportation of the screening apparatus; and wherein the means of altering the inclination and raising of the pre-screening module to a stowed position comprises one or more hydraulic lifting rams.

3. A mobile material screening apparatus for separating bulk particulate material into groups of particles of differing sizes, the apparatus comprising:

a support chassis;

a horizontal screen box apparatus, the horizontal screen box mounted on the support chassis and having an upper screen deck and a lower screen deck;

an additional pre-screening module, wherein the pre-screening module is provided with an upper inclined screen and a lower inclined screen and wherein the pre- screening module is provided with an upper conveyor and lower conveyor, the upper and lower conveyors being arranged parallel to the upper inclined screen and a lower inclined screen, the upper conveyor being adapted to convey material to the pre-screening module screens and the lower conveyor being adapted to transfer material from the pre-screening module to the horizontal screen box apparatus;

and whereby the arrangement of the apparatus is such as to provide for five different grades of material as output from the apparatus, namely reject unscreened material and four different grades of screened material.

and wherein the screening apparatus is further provided with one or more folding side conveyors for sized material, the or each folding conveyor being pivotally mounted on the chassis or the pre-screening module.

4. A mobile material screening apparatus for separating bulk particulate material as claimed in Claim 3, wherein the or each folding side conveyor comprises:

a beam rotatably connected to the chassis or the module support structure by means of a universal joint;

a support spar which is rotatably connected at one end to the module support structure by means of a pivotal hinge and at the other end to the beam by means of a pivotal joint, wherein the pivotal hinge is attached to the module support structure at a position that is vertically and horizontally offset from the universal joint;

and a means of rotating the support spar about the pivotal hinge whereby the rotation of the support spar is in a plane determined by the pivotal hinge and which causes the beam to move substantially in the direction of said rotation and to simultaneously revolve the beam about the universal joint so that the conveyor is moved from a deployed position to a stowed position.

5. A mobile material screening apparatus as claimed in Claim 4, wherein the means of rotating the support spar about the pivotal hinge comprises a hydraulic ram.

6. A mobile material screening apparatus as claimed in any one of Claim 3 to Claim 5, wherein a flexible linkage, which may comprise chains, cables or other suitable means, extends between the conveyor and the chassis or the module support structure to provide for support the conveyor while in a deployed configuration and to locate the conveyor in the optimum working position with the head drum of the conveyor in a horizontal position.

7. A mobile material screening apparatus for separating bulk particulate material into groups of particles of differing sizes, the apparatus comprising:

a support chassis;

a horizontal screen box apparatus, the horizontal screen box mounted on the support chassis and having an upper screen deck and a lower screen deck;

an additional pre-screening module, wherein the pre-screening module is provided with an upper inclined screen and a lower inclined screen and wherein the pre- screening module is provided with an upper conveyor and lower conveyor, the upper and lower conveyors being arranged parallel to the upper inclined screen and a lower inclined screen, the upper conveyor being adapted to convey material to the pre-screening module screens and the lower conveyor being adapted to transfer material from the pre-screening module to the horizontal screen box apparatus;

whereby the arrangement of the apparatus is such as to provide for five different grades of material as output from the apparatus, namely reject unscreened material and four different grades of screened material.

and wherein the upper conveyor is telescopically movable along its longitudinal axis.

8. A mobile material screening apparatus as claimed in Claim 7, wherein the telescopically movable upper conveyor comprises an upper portion and a lower portion, wherein the lower portion is linearly extensible relative the upper portion to which it is slidably attached; and wherein the telescopically movable conveyor is provided with a means of extension and retraction.

9. A mobile material screening apparatus as claimed in Claim 8, wherein the means of extension and retraction also raises the telescopically movable upper conveyor above the upper inclined screen.

10. A mobile material screening apparatus as claimed in Claim 8 or Claim 9, wherein the means of extension and retraction of the telescopically movable conveyor comprises:

a plurality of hydraulic rams, wherein the hydraulic rams each extend between the pre-screening module support structure and the lower portion of the telescopically movable conveyor;

a pair of connecting arms which are pivotably connected between hinged brackets provided on the module support structure and a lifting bar provided on the upper portion of the telescopically movable conveyor;

and movable mounting means provided on the module support structure, wherein the movable mounting means support the underside of the telescopic conveyor during use and enable said conveyor to slide smoothly between operating and transport positions.

1 1. A mobile material screening apparatus as claimed in Claim 10, wherein the hinged brackets provided on the module support structure act as a stop against the travel of the arms thereby retaining the telescopic conveyor at a correct working height above the upper inclined screen.

12. A mobile material screening apparatus as claimed in any one of the preceding claims, in which the pre-screening module is movably mounted to the chassis so that upon altering the inclination angle of the pre-screening module or upon raising the module to a horizontal stowed position, the upper end of the lower conveyor is retained in relative proximity to the horizontal screen box apparatus.

13. A mobile material screening apparatus for separating bulk particulate material into groups of particles of differing sizes, the apparatus comprising:

a support chassis;

a horizontal screen box apparatus, the horizontal screen box mounted on the support chassis and having an upper screen deck and a lower screen deck;

an additional pre-screening module, wherein the pre-screening module is provided with an upper inclined screen and a lower inclined screen and wherein the pre- screening module is provided with an upper conveyor and lower conveyor, the upper and lower conveyors being arranged parallel to the upper inclined screen and a lower inclined screen, the upper conveyor being adapted to convey material to the pre-screening module screens and the lower conveyor being adapted to transfer material from the pre-screening module to the horizontal screen box apparatus;

whereby the arrangement of the apparatus is such as to provide for five different grades of material as output from the apparatus, namely reject unscreened material and four different grades of screened material;

and wherein the screening apparatus is provided with a conveyor having an end which is foldable back on itself so as to reduce the length and height of the apparatus.

14. A mobile material screening apparatus as claimed in Claim 13, wherein the foldable conveyor comprises:

a two-part structure, wherein the two-part structure comprises an upper portion and a lower portion, the two portions extending end to end and connected by means of a hinged joint;

and a folding mechanism, wherein the folding mechanism is adapted to revolve the upper portion of the conveyor about the hinged joint such that said upper portion becomes inverted and rests on top of the upper deck of the apparatus.

15. A mobile material screening apparatus as claimed in Claim 14, wherein the folding mechanism comprises:

spaced apart lever assembly members, wherein the lever assembly members each comprise a substantially L-shaped member having a first limb and second limb;

spaced apart hydraulic rams each extending upwardly from brackets provided on the support chassis and pivotably connected at their upper ends to the ends of opposing first limbs of lever assembly members, respectively;

and linkage arms, wherein the linkage arms are each pivotably connected between spaced apart fulcrums and the respective lever assembly members at positions intermediate the first limb and second limb; and wherein the fulcrums are located on support posts provided on the support chassis.

16. A mobile material screening apparatus as claimed in Claim 15, wherein the second limbs of the lever assembly members are each pivotally coupled to the respective sides of the upper portion of the conveyor such that actuation of the hydraulic rams causes the folding mechanism to revolve upwardly about the support posts which in turn induces the rotation of the upper portion of conveyor.

17. A mobile material screening apparatus as claimed in Claim 14 to Claim 16 wherein the folding mechanism provides additional support to the conveyor.

18. A mobile material screening apparatus for separating bulk particulate material into groups of particles of differing sizes, the apparatus comprising:

a support chassis;

one or more folding side conveyors for sized material, the or each folding conveyor being pivotally mounted on the chassis; wherein the or each folding side conveyors comprises:

a beam rotatably connected to the chassis or the module support structure by means of a universal joint;

a support spar which is rotatably connected at one end to the module support structure by means of a pivotal hinge and at the other end to the beam by means of a pivotal joint, wherein the pivotal hinge is attached to the module support structure at a position that is vertically and horizontally offset from the universal joint;

and a means of rotating the support spar about the pivotal hinge whereby the rotation of the support spar is in a plane determined by the pivotal hinge and which causes the beam to move substantially in the direction of said rotation and to simultaneously revolve the beam about the universal joint so that the conveyor is moved from a deployed position to a stowed position.

19. A mobile material screening apparatus as claimed in Claim 18, wherein the means of rotating the support spar about the pivotal hinge comprises a hydraulic ram.

20. A mobile material screening apparatus as claimed in Claim 18 or Claim 19, wherein a flexible linkage, which may comprise chains, cables or other suitable means, extends between the conveyor and the chassis or the module support structure to provide support for the conveyor while in a deployed configuration and to locate the conveyor in the optimum working position with the head drum of the conveyor in a horizontal position.

21. A mobile material screening apparatus for separating bulk particulate material into groups of particles of differing sizes, the apparatus comprising:

a support chassis;
and a conveyor having an end which is foldable back on itself so as to reduce the length and height of the apparatus.

22. A mobile material screening apparatus as claimed in Claim 21 , wherein the foldable conveyor comprises:

a two-part structure, wherein the two-part structure comprises an upper portion and a lower portion, the two portions extending end to end and connected by means of a hinged joint;

and a folding mechanism, wherein the folding mechanism is adapted to revolve the upper portion of the conveyor about the hinged joint such that said upper portion becomes inverted and rests on top of the upper deck of the apparatus.

23. A mobile material screening apparatus as claimed in Claim 22, wherein the folding mechanism comprises:

spaced apart lever assembly members, wherein the lever assembly members each comprise a substantially L-shaped member having a first limb and second limb;

spaced apart hydraulic rams each extending upwardly from brackets provided on the support chassis and pivotably connected at their upper ends to the ends of opposing first limbs of lever assembly members, respectively;

and linkage arms, wherein the linkage arms are each pivotably connected between spaced apart fulcrums and the respective lever assembly members at positions intermediate the first limb and second limb; and wherein the fulcrums are located on support posts provided on the support chassis.

24. A mobile material screening apparatus as claimed in Claim 23, wherein the second limbs of the lever assembly members are each pivotally coupled to the respective sides of the upper portion of the conveyor such that actuation of the hydraulic rams causes the folding mechanism to revolve upwardly about the support posts which in turn induces the rotation of the upper portion of conveyor.

25. A mobile material screening apparatus as claimed in Claim 22 to Claim 24 wherein the folding mechanism provides additional support to the conveyor.

26. A mobile material screening apparatus as claimed in any one Claims 1 to 17 in which the output is arranged so that the discharge of reject material is closest to the location of the material input from a material crushing apparatus and the conveyor of the reject material from the screening apparatus is located at a position and an angle so as to discharge the reject material directly back to the material crushing apparatus, thereby providing a closed circuit recycling arrangement.

27. A mobile material screening apparatus in which the components can be folded and stowed on the apparatus while maintaining the travelling dimensions within the international standards for road travel without a special permit.

28. A mobile material screening apparatus substantially as herein described with reference to and as shown in Figures 3 to 10c of the accompanying drawings.