A CRUSHER MANTLE LIFTING DEVICE, AN ARRANGEMENT AND A METHOD

Abstract

The present disclosure relates to a crusher mantle lifting device. Attachment elements are configured to be attachable to a crusher mantle. Each attachment element includes a main portion having an inner surface facing the mantle and an outer surface. A locking portion projects from the inner surface and is configured to protrude into a corresponding opening in the mantle. One or more lifting portions project from the outer surface. A tightening means is configured to press the attachment elements towards the crusher mantle. The disclosure also relates to an arrangement and a method.

Claims

1.-13. (canceled)

14. A crusher mantle lifting device, comprising: two or more attachment elements, each attachment element being configured to be attachable to an outer surface of a crusher mantle, each attachment element comprising: a main portion having first and second opposite surfaces, wherein said first surface is configured to meet the outer surface of the mantle when the attachment element is attached and said second surface is configured to face away from the outer surface of the mantle, a locking portion projecting from the first surface of the main portion, said locking portion being configured to protrude into a corresponding opening in the outer surface of the mantle when the attachment element is attached, and one or more lifting portions projecting outwardly from the second surface of the main portion, each of said one or more lifting portions defining a respective lifting point on which a respective lifting force is exertable by a lifting tool, the crusher mantle lifting device further comprising tightening means configured to press the two or more attachment elements towards the outer surface of the crusher mantle when the attachment elements are attached, wherein the main portion of each attachment element comprises a distal end and a proximal end, wherein each attachment element is provided with a part of the tightening means or with a part for receiving the tightening means, said part being located closer to the distal end than the locking portion.

15. The crusher mantle lifting device according to claim 14, wherein said main portion of each attachment element comprises a distal end and a proximal end, wherein said first surface and said second surface extend from the distal end to the proximal end, wherein each attachment element is configured to be positioned in relation to the mantle such that a respective lifting force exerted by the lifting tool on each lifting point has a component directed in a proximal direction, and wherein said tightening means is configured to press each of the two or more attachment elements towards the outer surface of the crusher mantle by exerting pressure on said attachment element distally to said locking portion and said one or more lifting portions.

16. The crusher mantle lifting device according to claim 14, wherein the tightening means comprises a tightening element configured to be disposed around a circumference of the crusher mantle and the two or more attachment elements.

17. The crusher mantle lifting device according to claim 16, wherein the tightening element is a tightening strap, a wire or a chain.

18. The crusher mantle lifting device according to claim 16, wherein each attachment element further comprises a holding portion projecting from the second surface of the main portion, wherein the holding portion defines a loop, through hole, or a recess, configured to hold the tightening element.

19. The crusher mantle lifting device according to claim 18, wherein said holding portion is located distally to said locking portion and said one or more lifting portions.

20. The crusher mantle lifting device according to claim 14, wherein the locking portion extends from the first surface at least partly in a proximal direction.

21. The crusher mantle lifting device according to claim 14, wherein the locking portion is cylindrically shaped, said locking portion being configured to protrude into a corresponding cylindrical opening in the outer surface of the crusher mantle when attached.

22. The crusher mantle lifting device according to claim 15, wherein each attachment element comprises two lifting portions projecting from the second surface of the main portion at opposite sides of a centre symmetry axis extending from the distal end to the proximal end of the main portion.

23. The crusher mantle lifting device according to claim 14, wherein each of the one or more lifting portions comprises a through hole located at the lifting point.

24. The crusher mantle lifting device according to claim 14, further comprising a main lifting element and a chain assembly, wherein the chain assembly connects each lifting point of the one or more lifting portions to the main lifting element.

25. An arrangement comprising: a crusher mantle having an outer surface, wherein the mantle has two or more openings in the outer surface, and a crusher mantle lifting device according to any one of the preceding claims, wherein, when each attachment element is attached to the mantle, the locking portion protrudes into a corresponding one of said openings in the outer surface of the mantle, and the tightening means press the two or more attachment elements against the outer surface of the mantle.

26. A method for attaching a crusher mantle lifting device according to claim 14 to a crusher mantle, the method comprising: placing two or more attachment elements of the crusher mantle lifting device onto an outer surface of a crusher mantle such that respective locking portions of the two or more attachment elements protrude into corresponding openings in an outer surface of the crusher mantle, tightening the tightening means so as to press the two or more attachment elements towards the outer surface of the crusher mantle.

27. The method according to claim 26, further comprising: placing a tightening element around the circumference of the crusher mantle and the two or more attachment elements, and wherein tightening the tightening means comprises tightening the tightening element by decreasing a circumferential length thereof.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG. 1 illustrates, in a side view, an arrangement according to at least one example embodiment of the invention.

[0044] FIG. 2 illustrates the arrangement of FIG. 1 rotated 90°.

[0045] FIG. 3 is a detailed perspective view of said arrangement.

[0046] FIG. 4 is a detailed cross-sectional view of said arrangement.

[0047] FIG. 5 illustrates, in a perspective view, an attachment element according to at least one example embodiment of the invention.

[0048] FIG. 6 is a cross-sectional view of said attachment element.

[0049] FIG. 7 is a side view of said attachment element.

DETAILED DESCRIPTION OF THE DRAWINGS

[0050] FIG. 1 illustrates, in a side view, an arrangement 1 according to at least one example embodiment of the invention. FIG. 2 illustrates the arrangement 1 of FIG. 1 rotated 90°. As can be seen from FIG. 1 and FIG. 2, the arrangement 1 comprises a crusher mantle 3 (only an upper portion of it being visible), such as a gyratory crusher mantle, and a crusher mantle lifting device 5 for connecting the crusher mantle 3 to a lifting tool, such as a hydraulic lifting tool (not shown). In the following detailed description the crusher mantle 3 will, for the sake of simplicity and legibility, only be referred to as “the mantle 3”. Similarly, the crusher mantle lifting device 5 will only be referred to as “the lifting device 5”.

[0051] The mantle 3 is here illustrated as being mounted on a main shaft 7 of a crusher, such as a gyratory crusher. The mantle 3 tapers upwardly from a larger diameter end (not visible) to a smaller diameter end 9. Near the smaller diameter end 9 the angle of taper is increased to form a bevelled end portion 11.

[0052] The lifting device 5 comprises two attachment elements 13, which have been attached to the outer enveloping surface of the mantle 3, spaced apart at 180° in the circumferential direction of the mantle 3. However, it is conceivable to have more than two attachment elements 13, such as three or four attachment elements. Suitably, the plurality of attachment elements 13 will be equally spaced around the circumference of the mantle 3.

[0053] FIGS. 5-7 illustrate in more detail how such attachment elements 13 may be embodied. Thus, with reference to FIGS. 5-7, the attachment element 13 comprises a main portion 15, which is substantially plate-like. The main portion has a first (inner) surface 17 which is configured to abut the mantle 3 (as can be seen in FIG. 4), and a second (outer) surface 19 which faces away from the mantle 3. As can be seen in FIGS. 5-7, the attachment element 13 comprises two lifting portions 21 projecting from the second surface 19 of the main portion 15. Each lifting portion 21 has a through hole 23 which defines a lifting point on which a respective lifting force is exertable by the lifting tool. A chain assembly may be connected to the through hole 23.

[0054] As can be seen in FIGS. 5 and 7, the main portion 15 is provided in three plate sections, namely a middle section 15a and two inwardly angled lateral sections 15b on either side of the middle section. However, it should be noted that other number of sections or curved main portions may be provided. In any case, the first surface 17 may be substantially concave and the second surface 19 substantially convex. In the illustration of FIG. 5 the each lateral section 15b is provided with one of the lifting portions 21. Thus, the lifting portions 21 are provided at opposite sides of a centre symmetry axis extending from a distal end 25 to a proximal end 27 of the main portion.

[0055] The second surface 19 is, at the middle section 15a, also provided with a handle 29 and a loop 31. The loop 31, which can be regarded as forming part of tightening means, is for guiding a tighting element such as a tightening strap 33 illustrated in FIGS. 1-4. It should be understood that instead of loops 31, other types of holding portion may be provided for holding/and or guiding the tightening element, such as for instance recesses.

[0056] Continuing with FIGS. 6 and 7, as mentioned above, the main portion 15 of the attachment element 13 has a distal end 25 and a proximal end 27. The lifting portions 21 are located nearer the proximal end 27 than the distal end 25. Although the proximal extension may be different in other embodiments, in general it is advantageous to provide the lifting portions 21 proximally of the loop 31. The attachment element 13 is configured to be positioned in relation to the mantle 3 such that a respective lifting force exerted by the lifting tool on each lifting point has a component directed in a proximal direction.

[0057] As can be seen in FIGS. 5 and 6, a locking portion 35 projects from the first surface 17 of the main portion (in this illustration from the middle section 15a), said locking portion 35 being configured to protrude into a corresponding opening 37 in the outer surface of the mantle 3 when the attachment element 13 is attached (as illustrated in FIG. 4). The locking portion 35 is here illustrated as being substantially cylindrical and mating with a corresponding cylindrical opening 37 in the mantle 3, however, other geometrical shapes are conceivable. Although the locking portion 35 has its main extension directed inwardly (i.e. in a direction towards the centre of the mantle 3 when the attachment element 13 is attached), the projection from the first surface 17 is also slightly towards the proximal end 27 of the main portion 15. Thus, in the illustrated embodiment, the locking portion 35 projects at a non-perpendicular angle from the first surface 17. As can be seen in FIGS. 4, 6 and 7, the locking portion 35 is located closer to the proximal end 27, compared to the loop 31 which is located closer to the distal end 25 of the main portion 15.

[0058] Turning back to FIGS. 1-4, the lifting device 5 further comprises tightening means, herein illustrated as comprising said tightening strap 33 which is disposed around the circumference of the mantle 3 and around the attachment elements 13. The tightening strap 33 is configured to press the attachment elements 13 towards the outer surface of the mantle 3. The tightening strap 33 may suitably be tightened by means of a ratchet 39, as illustrated in FIG. 3.

[0059] With reference to FIGS. 1 and 2, the lifting device 5 also comprises a main lifting element 41 and a chain assembly 43 which includes chains extending from the main lifting element 41 to the attachment elements 13. More specifically, the chain assembly 43 connects each lifting point of the lifting portions 21 to the main lifting element 41. In operation a lifting tool will exert a lifting force on the main lifting element 41. The lifting force will be transmitted via the chains to the attachment element 13 and the locking portion 35, the latter extending into the opening 37 in the mantle 3 (see FIG. 4), and hence the mantle 3 will be lifted off the main shaft 7 and can be replaced by another mantle. As can be seen in the example of FIGS. 1 and 2, in operation, the distance between chains is smaller at the main lifting element 41 than at the attachment elements 13. In other words, as illustrated in FIG. 1, the distance between chain receiving means 45 of the main lifting element 41 is shorter than the top diameter at the end 9 of the mantle 3. Furthermore, as illustrated in FIG. 2, the distance between the two chain receiving means 45 that receive chains that extend to two lifting portions 21 on one and the same attachment element 13 is smaller than the distance between said two lifting portions 21. These upwardly and inwardly directed inclinations of the chains will further enhance the pressing of the locking portions 35 inwardly towards the mantle centre.

[0060] Each locking portion 35 will be pressed inwardly towards the mantle centre by two applied forces. On the one hand, the traction force from the chains will press the attachment element 13, and thus locking portion 35 inwardly. The locking portion 35 inserted in the corresponding opening 37 in the mantle 3 may be regarded as presenting a pivot point, which will cause the proximal end 27 of the main portion 15 of the attachment element 13 to be pressed against the mantle 3. Similarly the tightening strap 33 will press the distal end 25 of the main portion 15, and thus also the locking portion 35, inwardly. Thus, the tightening strap 33 exterts pressure on said attachment elements 13 distally to the locking portions 35 and the lifting portions 21.

[0061] The skilled person realizes that a number of modifications of the embodiments described herein are possible without departing from the scope of the invention, which is defined in the appended claims.