Method and apparatuses for screening

Patent metadata

Field	Value
Publication number	US-9370798-B2
Application number	US-201514618121-A
Country	US
Kind code	B2
Filing date	Feb 10, 2015
Priority date	Mar 21, 2007
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A screening machine includes wall members, screen assembly guide members, a screen assembly and a compression assembly. The screen assembly includes a frame with a plurality of side members and a screen supported by the frame. The compression assembly is attached to at least one wall member and forms the screen assembly into a concave shape.

First claim

What is claimed is:

1. A screen assembly for a vibratory screening machine, comprising:
a frame;
a screening material supported by the frame;
wherein the frame is configured to deflect such that a top surface of the screening material is formed into a concave shape and a bottom surface of the frame opposite the top surface of the screening material is formed into a predetermined convex shape that mates with a concave support surface of the vibratory screening machine when a compression force is applied against a side member of the frame.

2. The screen assembly of claim 1 , further comprising a screen assembly mating surface on a surface of the frame that mates with a guide assembly mating surface on a wall of the vibratory screening machine.

3. The screen assembly of claim 2 , wherein the screen assembly mating surface is located such that it guides the screen assembly into a predetermined position when mated with the guide assembly mating surface.

4. The screen assembly of claim 2 , wherein the screen assembly mating surface is formed in a corner of the screen assembly.

5. The screen assembly of claim 2 , wherein the screen assembly mating surface is formed generally centrally in the side member of the frame.

6. The screen assembly of claim 1 , wherein the top surface is a mesh screen.

7. A system, comprising: a screen assembly and a vibratory screening machine, wherein the screen assembly includes a frame and a screening material supported by the frame, wherein the vibratory screening machine includes a first wall member including a compression assembly, a second wall member including a stop surface, and a concave support surface located between the first and second wall members, wherein the frame is configured to deflect such that a top surface of the screening material is formed into a concave shape and a bottom surface of the frame opposite the top surface of the screening material is formed into a predetermined convex shape that mates with the concave support surface of the vibratory screening machine when a compression force is applied against a side member of the frame.

8. The system of claim 7 , further comprising a screen assembly mating surface on a surface of the frame that mates with a guide assembly mating surface on a wall of the vibratory screening machine.

9. The system of claim 8 , wherein the screen assembly mating surface is located such that it guides the screen assembly into a predetermined position when mated with the guide assembly mating surface.

10. The system of claim 8 , wherein the screen assembly mating surface is formed in a corner of the screen assembly.

11. The system of claim 8 , wherein the screen assembly mating surface is formed generally centrally in a side member of the screen assembly.

12. The system of claim 7 , wherein the top surface is a mesh screen.

13. The system of claim 7 , wherein the compression assembly includes a bar member attached to the first wall member configured to assert the force against the screen assembly when the bar member is rotated.

14. The system of claim 13 , wherein the bar member is hinged to the first wall and is rotated along a hinge joint.

15. The system of claim 14 , wherein the bar member is attached to a plurality of retractable members.

16. The system of claim 15 , wherein the plurality of retractable members are configured to extend through apertures in the first wall member and contact the first surface of the screen assembly.

17. The system of claim 14 , further comprising a compression assembly handle attached to the bar member, wherein the compression assembly handle is configured to rotate the bar member along the hinge joint when force is applied.

18. The system of claim 7 , wherein the compression assembly includes a retractable member that advances and contracts, wherein as the retractable member advances it is configured to assert a force against the side member of the frame.

19. The system of claim 7 , wherein the compression assembly includes a mechanism configured to adjust an amount of deflection imparted to the screen assembly.

20. The system of claim 18 , wherein the retractable member advances and contracts by at least one of a manual force, a hydraulic force and a pneumatic force.

21. A method for screening a material, comprising:
placing a screen assembly on a vibratory screening machine, the vibratory screening machine including a first wall member, a second wall member, a compression member, and a concave support surface located between the first and second wall members, the screen assembly including a frame and a screening material supported by the frame;
securing the screen assembly to the vibratory screening machine by pushing the compression member against the screen assembly such that the frame deflects and a top surface of the screening material is formed into a concave shape and a bottom surface of the frame opposite the top surface of the screening material is formed into a convex shape that mates with the concave support surface of the vibratory screening machine; and
screening the material.

22. The method of claim 21 , further comprising:
releasing the compression member such that the screen assembly is no longer compressed;
replacing the screen assembly with another screen assembly; and
performing the securing step with another screen assembly.

23. The method of claim 21 , wherein the compression member pushes against a side member of the frame to secure the screen assembly to the vibratory screening machine.

24. A system, comprising: a screen assembly and a vibratory screening machine, wherein the screen assembly includes a frame and a screening material supported by the frame, wherein the vibratory screening machine includes a first wall member, a second wall member, a compression member, and a concave support surface located between the first and second wall members, wherein the screen assembly is secured to the vibratory screening machine by pushing the compression member against the screen assembly such that the frame deflects and a top surface of the screening material is formed into a concave shape and a bottom surface of the frame opposite the top surface of the screening material is formed into a convex shape that mates with the concave support surface of the vibratory screening machine.

25. The system of claim 23 , wherein the top surface is a mesh screen.

26. The system of claim 23 , wherein the compression member pushes against a side member of the frame to secure the screen assembly to the vibratory screening machine.

Assignees

• Derrick Corp

Inventors

• Wojciechowski Keith
• Newman Christian

Classifications

• B07B2201/02

  Fastening means for fastening screens to their frames which do not stretch or sag the screening surfaces · CPC title

• B07B1/48 Primary

  Stretching devices for screens · CPC title

• B07B1/4609 Primary

  constructional details of screening surfaces or meshes · CPC title

• B07B1/28

  Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens · CPC title

• B07B1/485 Primary

  Devices for alternately stretching and sagging screening surfaces · CPC title