Static screening system and methods

Patent metadata

Field	Value
Publication number	US-12226802-B2
Application number	US-202418677387-A
Country	US
Kind code	B2
Filing date	May 29, 2024
Priority date	May 30, 2023
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

Static screening apparatuses that provide improved efficiency in the removal of undersized particles from oversized particles. In an embodiment, a static screening apparatus incorporates two or more (e.g., multiple) stacked screening modules allowing for adding additional screening capacity without significantly increasing space requirements for the multiple screening apparatuses. In some embodiments, a static screening apparatus utilizes specialized synthetic screening surfaces having an increased open area in relation to convention wire and wedge wire screens. The increased open area of such synthetic screen surfaces provides more efficient separation of oversized materials from undersized materials in sieve or static screen assemblies. In further embodiments, a stacked static screening apparatus may incorporate synthetic screening surfaces.

First claim

The invention claimed is:

1. A static screening apparatus for separating oversized materials from undersized materials under the force of gravity, comprising:
a first screening module;
a second screening module stacked vertically above the first screening module, wherein each screening module includes:
a first sidewall and a second sidewall spaced from the first sidewall, the first and second sidewalls extending from an inlet end to an outlet end, wherein the outlet end is disposed below the inlet end and wherein at least one of the first sidewall and the second sidewall includes at least one screening bed access opening between its upper edge and its lower edge;
cross-support members disposed between opposing inside surfaces of first and second sidewalls and between upper and lower edges of the first and second sidewalls the cross-support members defining a concave screening bed;
guide members disposed across at least a portion of a distance between opposing inside surfaces of first and second sidewalls; and
a plurality of removable screen assemblies each having a thermoplastic screening surface, wherein the plurality of screen assemblies collectively define a concave screening surface and wherein each screen assembly includes an engagement element to slidably engage at least one guide member when the screen assembly is inserted through the screening bed access opening for disposition between the first and second sidewalls; and
a bottom surface extending between lower edges of the sidewalls, wherein undersized materials passing through the concave screening surface are collected on the bottom surface and exit though a discharge proximate to a lower end of the bottom surface and oversized materials exit over a lower end of the concave screening surface.

2. The apparatus of claim 1 , wherein each screening assembly is a flat screening assembly and wherein each flat screening assembly is disposed at an angle relative to at least one adjacent flat screening assembly.

3. The apparatus of claim 1 , wherein the first screening module forms a first flow path through the apparatus and the second screening module forms a separate second flow path through the apparatus.

4. The apparatus of claim 1 , wherein at least a portion of the guide members are each integrally formed with a cross-support member.

5. The apparatus of claim 4 , wherein the guide members are positioned to be engaged through the at least one screening bed access opening.

6. The apparatus of claim 1 , wherein each thermoplastic screening surface has openings with sizes in a range from approximately 35 microns to approximately 4,000 microns.

7. The apparatus of claim 5 , wherein each thermoplastic screening surface has an open screening area of approximately 5% to approximately 35% of a total area of the thermoplastic screening surface.

8. The apparatus of claim 1 , wherein each thermoplastic screening surface comprises a plurality of independent injection molded thermoplastic screen elements configured to be secured to a support structure to form a continuous screening surface.

9. A static screening system for separating oversized materials from undersized materials under the force of gravity, comprising:
a screening module, wherein the screening module includes:
a first sidewall and a second sidewall spaced from the first sidewall, the first and second sidewalls extending from an inlet end to an outlet end, wherein the inlet end is disposed above the outlet end and wherein at least one sidewall of the first sidewall and the second sidewall includes a screening bed access opening between its upper edge and its lower edge;
a plurality of cross-support members disposed between opposing inside surfaces of first and second sidewalls and between upper and lower edges of the first and second sidewalls, the cross-support members defining a concave screening bed;
guides disposed across at least a portion of a distance between opposing inside surfaces of first and second sidewalls; and
a bottom surface extending between lower edges of the sidewalls; and

a screening assembly configured for receipt on the concave screening bed, wherein the screening assembly includes:
a screening surface; and
at least one engagement element connected to the screening surface and configured for slidable engagement with at least one guide when the screen assembly is inserted through the screening bed access opening for disposition between the first and second sidewalls; and

wherein undersized materials passing through the screening assembly are collected on the bottom surface of the screening module and exit though a discharge port proximate to a lower end of the bottom surface and oversized materials exit over a lower end of the screening assembly.

10. The screening system of claim 9 , wherein the screening assembly comprises a plurality of individual screening assemblies, wherein the plurality of individual screen assemblies collectively define a concave screening surface.

11. The screening system of claim 10 , wherein each of the plurality of individual screening assemblies is a flat screening assembly and wherein each flat screening assembly is disposed at an angle relative to at least one adjacent flat screening assembly.

12. The screening system of claim 9 , wherein the screening surface comprises a thermoplastic screening surface.

13. The screening system of claim 9 , wherein the thermoplastic screening surface has openings with sizes in a range from approximately 35 microns to approximately 4,000 microns.

14. The screening system of claim 12 , wherein the thermoplastic screening surface has an open screening area of approximately 5% to approximately 35% of a total area of the thermoplastic screening surface.

15. The screening system of claim 12 , wherein the thermoplastic screening surface comprises a plurality of independent injection molded thermoplastic screen elements secured to a support structure to form a continuous screening surface.

16. The screening system of claim 9 , wherein at least a portion of the guide members are each integrally formed with a cross-support member.

17. The screening system of claim 9 , wherein the guide members are positioned to be engaged through the screening bed access opening.

18. A static screening system for separating oversized materials from undersized materials under the force of gravity, the system comprising:
a first screening module;
a second screening module stacked vertically above the first screening module;
wherein each screening module includes:
a first sidewall and a second sidewall spaced from the first sidewall, the first and second sidewalls extending from an inlet end to an outlet end, wherein the inlet end is disposed above the outlet end;
support members disposed between opposing inside surfaces of first and second sidewalls and between upper and lower edges of the first and second sidewalls, the support members defining a screening bed; and
a bottom surface extending between lower edge of the sidewalls;

a first removable screening assembly for attachment to the first module; and
a second removable screening assembly for attachment to the second module,
wherein each removable screening assembly includes:
a concave screening surface over a length of the screening assembly between a screening surface inlet end and a screening surface outlet end; and
a support structure for supporting the screening surface; and

wherein undersized materials passing through the screening surfaces are collected on the bottom surfaces of the first and seco

Assignees

• Derrick Corp

Inventors

• Colgrove James
• Walleshauser Zachery
• Geles Glenn
• Collins Layne

Classifications

• B03B5/48 Primary

  by mechanical classifiers · CPC title

• B07B2201/04

  Multiple deck screening devices comprising one or more superimposed screens · CPC title

• B07B1/4645 Primary

  Screening surfaces built up of modular elements · CPC title