SCREEN TIGHTENING IN MOBILE MULTI-DECK SCREENING DEVICES

Abstract

A screen medium of a mobile multi-deck screen is tensioned with a tensioner. A tensioning link engages and tensions a screen medium on a side thereof by at least two linear tension rods, when the screen medium side tensioner is installed to the mobile multi-deck screening device. An adjusting member causes for each of the at least two linear tension rods, a linear movement tensioning by the tensioning link the side of the screen medium above the two linear tension rods. A retractor disengages the tensioning link responsively to untightening the at least two tensioning rods. A screen deck, a screen and a mobile multi-deck screening device are also disclosed as well as a method for replacing a screen medium using the tensioner.

Claims

1-14. (canceled)

15. A screen medium side tensioner for a mobile multi-deck screening device, comprising: at least two linear tension rods; a tensioning link configured responsive to tightening the linear tension rods to engage and tension a screen medium on a side of the screen medium, when the screen medium side tensioner is installed to the mobile multi-deck screening device; and for each of the at least two linear tension rods, an adjusting member configured to cause linear movement of the respective linear tension rod; the tensioning link being configured to tension the side of the screen medium above the two linear tension rods, wherein the screen medium side tensioner further comprising a retractor configured, responsive to untightening the at least two linear tension rods, to retract the tensioning link so that the tensioning link disengages the screen medium.

16. The screen medium side tensioner of claim 15, further comprising a guide configured to guide the tensioning link.

17. The screen medium side tensioner of claim 15, wherein the retractor is integrated with the at least two linear tension rods.

18. The screen medium side tensioner of claim 15, wherein the tensioning link is configured to tighten an entire side of the screen medium.

19. The screen medium side tensioner of claim 15, wherein the tensioning link is configured to tighten a portion of the screen medium.

20. A screen deck of a mobile multi-deck screening device, comprising: a screen medium side tensioner comprising: at least two linear tension rods; a tensioning link configured responsive to tightening the linear tension rods to engage and tension a screen medium on a side of the screen medium, when the screen medium side tensioner is installed to the mobile multi-deck screening device; and for each of the at least two linear tension rods, an adjusting member configured to cause linear movement of the respective linear tension rod; the tensioning link being configured to tension the side of the screen medium above the two linear tension rods, wherein the screen medium side tensioner further comprising a retractor configured, responsive to untightening the at least two linear tension rods, to retract the tensioning link so that the tensioning link disengages the screen medium; and a frame configured to receive the screen medium side tensioner.

21. The screen deck of claim 20, wherein the frame is configured to movably support two opposite sides of the screen medium by two screen medium side tensioners.

22. A multi-deck screen of a mobile multi-deck screening device, comprising: one or more of the screen decks of claim 21; and a screen body configured to support the one or more screen decks.

23. The multi-deck screen of claim 22, wherein the screen body is configured to support the one or more screen decks in two or more different positions or orientations.

24. A mobile multi-deck screening device, comprising: the multi-deck screen of claim 22; and a mobile platform configured to support the multi-deck screen.

25. The mobile multi-deck screening device of claim 24, further comprising a side plate configured to close from the material being screened at least a portion of a side of the multi-deck screen.

26. The mobile multi-deck screening device of claim 25, wherein the side plate further comprises a detachable attachment mechanism configured to allow detaching and attaching the side plate without tools.

27. The mobile multi-deck screening device of claim 25, wherein the side plate further comprises a sealing configured to inhibit leaking of material being screened under the side plate, wherein the sealing is configured to abut an edge of the screen medium.

28. A method for replacing a screen medium in a mobile multi-deck screening device, comprising: retracting a tensioning link on a side of the screen medium by untightening linear tension rods; disengaging the screen medium by the retracting of the tensioning link in response to untightening at least two linear tension rods; removing the screen medium when disengaged from the tensioning link; placing a new screen medium in the multi-deck screening device, which screen medium has an engagement end, so that the engagement end is facing the tensioning link; and tensioning at least two linear tension rods of the multi-deck screening device so that the engagement end is engaged and the screen medium is tightened by the tensioning link; tensioning the at least two linear tension rods from outside of the multi-deck screening device; performing disengaging the screen medium by the retracting of the tensioning link using a retractor in response to untightening at least two linear tension rods.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0057] Some example embodiments will be described with reference to the accompanying figures, in which:

[0058] FIG. 1 shows a schematic drawing of a mobile multi-deck screening device;

[0059] FIG. 2 shows a three-dimensional view of a screen deck with one screen medium;

[0060] FIG. 3 shows a top view of a screen deck with three screen media;

[0061] FIG. 4 shows a three-dimensional view of some details of a screen medium side tensioner;

[0062] FIG. 5 shows another three-dimensional view of some details of the screen medium side tensioner;

[0063] FIG. 6 shows a sealing of an example; and

[0064] FIG. 7 shows a flow chart of a screen medium tightening process.

DETAILED DESCRIPTION

[0065] FIG. 1 shows a schematic drawing of a mobile multi-deck screening plant 100, comprising: a multi-deck screening device 110 with a plurality of screen decks 112, 114; and mobile platform 120 comprising a wheel 122 and a track 124. The multi-deck screening device 110 further comprises a vibrator 116 and a body 118 that supports the screen decks 112, 114 and the vibrator 116.

[0066] FIG. 2 shows a three-dimensional view of a screen deck 112 with one screen medium 240. The screen medium 240 comprises on its sides engagement ends 242 that are hook-profiled forms. More than 50 wt-% of the engagement ends 242 may be of steel, aluminum or composite material. FIG. 2 further shows a frame 210; adjusting members 220 for adjusting respective linear tension rods (410 in FIG. 4), here nuts; a side plate 230; and an tensioning link 250 for relaying force from the plurality of tension rods 410 to the engagement ends 242 at and between the tension rods 410.

[0067] FIG. 3 shows a top view of the screen deck 112 with three screen media 240. It appears in FIG. 3 how a plurality of screen media 240 (here three) are mounted adjacent to each other to cover the screen deck 112. The gaps between adjacent ones of the screen media 240 are blocked by gap strips (not shown) so as to avoid leakage of oversized mineral material between the adjacent screen media 240. These gap strips may extend substantially as long as the screen media 240 so that they can also seal a gap between the adjacent screen media and the side plates 230 as will be better understood from FIG. 5.

[0068] FIG. 4 shows a three-dimensional view of some details of a screen medium side tensioner 400. The screen medium side tensioner 400 comprises the adjustment member 220; the linear tension rods 410, shown here without a spring 510 (FIG. 5) for moving the tensioning link 250 outward or inward for tightening or untightening the screen medium 240; a guide 420 for guiding the tensioning link to move along a substantially linear track so that the tensioning link can be held in position for engaging with the engagement end 242 of the screen medium, when a screen medium is being installed.

[0069] FIG. 5 shows another three-dimensional view of some details of the screen medium side tensioner 400, including the spring 510 around the linear tension rod 410.

[0070] FIG. 6 shows a sealing 610 of an example. The sealing 610 is attached to a side plate 520 such that the engagement end 242 depresses the sealing 610 when tightened. Also the gap strips discussed in connection with FIG. 3 are sealed by the sealing 610.

[0071] In FIG. 6, a D-seal is used as the sealing 610. Other forms, such as B-seal, are also usable, as well as filled compressible seals such as foam seals. It is also perceivable to furnishing a relatively stiff sealing that basically corresponds to that of FIG. 6 but lacks the bottom part that further supports the sealing 610 to the side plate 520.

[0072] FIG. 7 shows a flow chart of a screen medium tightening process 700 for replacing a screen medium in a mobile multi-deck screening device, comprising:

[0073] 710. retracting a tensioning link on a side of the screen medium by untightening linear tension rods;

[0074] 720. disengaging the screen medium by the retracting of the tensioning link;

[0075] 730. removing the screen medium when disengaged from the tensioning link;

[0076] 740. placing a new screen medium in the multi-deck screening device, which screen medium has an engagement end, so that the engagement end is facing the tensioning link;

[0077] 750. tensioning at least two linear tension rods the multi-deck screening device so that the engagement end is engaged and the screen medium is tightened by the tensioning link;

[0078] 760. tensioning the at least two linear tension rods from outside of the multi-deck screening device.

[0079] The process 700 further comprises in an example one or more of:

[0080] 770. guiding the tensioning link to move along a linear track;

[0081] 780. sealing the screen medium responsive to the tightening of the screen medium.

[0082] Various embodiments have been presented. It should be appreciated that in this document, words comprise, include and contain are each used as open-ended expressions with no intended exclusivity.

[0083] The foregoing description has provided by way of non-limiting examples of particular implementations and embodiments of the invention a full and informative description of the best mode presently contemplated by the inventors for carrying out the invention. It is however clear to a person skilled in the art that the invention is not restricted to details of the embodiments presented in the foregoing, but that it can be implemented in other embodiments using equivalent means or in different combinations of embodiments without deviating from the characteristics of the invention.

[0084] Furthermore, some of the features of the afore-disclosed embodiments of this invention may be used to advantage without the corresponding use of other features. As such, the foregoing description shall be considered as merely illustrative of the principles of the present invention, and not in limitation thereof. Hence, the scope of the invention is only restricted by the appended patent claims.