Screen module, processing apparatus and processing plant for mineral material

1. A two-deck mineral material screen module comprising:

cross beams for fixing the screen module to a side of a body of a mineral material processing apparatus;

an upper screen fixed above the cross beams;

lower longitudinal supports fixed below the cross beams; and

a lower screen fixed below the lower longitudinal supports, wherein the lower screen is mounted from below and is supported against the lower longitudinal supports which form together with the lower screen a through-flow path for material flow above the lower screen so as to guide material to be screened on the lower screen longitudinally with reference to the screen module.

2. The screen module according to claim 1 , wherein the screen module comprises:

an auxiliary body for fixing the screen nodule to the body of the mineral material processing apparatus: and

wherein the cross beams are fixed to the auxiliary body.

3. The screen module according to claim 2 , wherein the screen module comprises:

a lower support region defined by the height of the lower longitudinal supports and the lower screen and is fixable at at least two sides to one of the body or the auxiliary body for fixing the lower screen relative to cross beams.

4. The screen module according to claim 2 , wherein the screen module comprises:

upper longitudinal supports fixed above the cross beams and by which the cross beams supporting the upper longitudinal supports are fixed to each other; and

an upper support region configured to support the upper screen on the upper longitudinal supports, which upper support region is defined by the height of the upper longitudinal supports, and wherein the upper screen is fixable at its at least two sides to one of the body or the auxiliary body for fixing the upper screen relative to cross beams.

5. The screen module according to claim 1 , wherein the upper screen or the lower screen comprises one of a screen mesh, a screen element or a perforated screen plate.

6. The screen module according to claim 1 , wherein the height of the lower longitudinal supports defines a penetrating distance between the cross beams and the lower screen of the through-flow path of the material to be processed.

7. The screen module according to claim 1 , wherein changeable wear plates are fixed on a surface of the lower longitudinal supports.

8. A processing apparatus for mineral material screening comprising a frame and at least one screen module according to claim 1 .

9. The processing apparatus according to claim 8 , wherein the screen module is fixed to the frame; and the upper screen or the lower screen is fixed at least at two sides to one of the frame or an auxiliary body comprised by the screen module.

10. The processing apparatus according to claim 8 , wherein the upper screen and/or the lower screen comprises in sides thereof gripping points, and the processing apparatus comprises fixing means which fix the upper screen and/or the lower screen through the gripping points to one of the frame or an auxiliary body comprised by the screen module.

11. The processing apparatus according to claim 10 , wherein the gripping points of the upper screen and the lower screen comprises a hook form configured to grip the fixing means.

12. The processing apparatus according to claim 10 , wherein the fixing means comprises a fixing member enabling a fixing and opening movement by which the fixing means is movable to and from the frame or the auxiliary body, wherein the fixing member is configured to support the upper or lower screen such that the upper or lower screen is kept supported by the fixing means in a non-tensioned state of the fixing means.

13. The mineral material processing apparatus of claim 12 wherein the fixing member is a screw with a long stroke.

14. The processing apparatus according to claim 8 , wherein two screen modules are arranged on top of each other in the processing apparatus.

15. The processing apparatus according to claim 8 , wherein at least two screen modules are arranged successively in the processing apparatus.

16. The processing apparatus according to claim 15 , wherein screen decks of the successive screen modules are arranged in an angular position relative to each other.

17. A mineral material processing plant comprising a screen module according to claim 1 .

18. The mineral material processing plant according to claim 17 , wherein the processing plant is selected from a group consisting of: fixed plant, an independent movable plant and a plant which is transportable on road.

19. A two-deck mineral material screen module comprising:

longitudinal beams for fixing the screen module to a body of a mineral material processing apparatus;

an upper screen fixed above the longitudinal beams;

upper longitudinal supports fixed above the longitudinal beams to support the upper screen above the longitudinal beam;

a lower screen fixed below the longitudinal beams; and

lower longitudinal supports fixed below the longitudinal beams to support the lower screen below the lower longitudinal supports,

wherein the lower screen is mounted from below and is supported against the lower longitudinal supports which form together with the lower screen a through-flow path for material flow above the lower screen so as to guide material to be screened on the lower screen longitudinally with reference to the screen module.