Method for lifting an inner wear part of a gyratory or cone crusher, an inner wear part, a gyratory or cone crusher and an inner wear part lifting tool

Abstract

A method for lifting an inner wear part of a gyratory or cone crusher and an inner wear part lifting tool for use with the method. The gyratory or cone crusher has a frame, an outer wear part fixable to the frame and the inner wear part fixable to a support cone of the crusher which outer and inner wear part define a crushing chamber. The inner wear part has an inner surface including a first inner support surface arranged, in a crushing phase, to be supported by a first counter surface of the support cone. In a first phase, a lifting arm of a lifting tool is arranged inside the inner wear part and under the inner surface of the inner wear part. In a second phase, an upper second counter surface of the lifting arm is coupled with a second inner support surface of the inner wear part.

Claims

1. A method for lifting an inner wear part of a gyratory or cone crusher which gyratory or cone crusher comprises a frame, an outer wear part fixable to the frame and the inner wear part fixable to a support cone of the crusher which outer and inner wear parts together define a crushing chamber for receiving crushable material, and the inner wear part comprises an inner surface comprising a first inner support surface that is arranged, in a crushing phase, to be supported by a first counter surface of the support cone, comprising: arranging in a first phase two lifting arms of a lifting tool inside the inner wear part and under the inner surface of the inner wear part, wherein the two lifting arms are rigid members and are pivotably joined to each other at a pivot; and coupling in a second phase an upper second counter surface of each of the lifting arms of the lifting tool with a second inner support surface of the inner wear part in corresponding reliefs of the second inner support surface, wherein the second inner support surface is formed in an upper section of the inner surface of the wear part.

2. The method according to claim 1, further comprising arranging, in the first phase in such a situation where the inner wear part is mounted on the support cone, the lifting arm of the lifting tool into a lifting tool space between the inner wear part and the support cone which lifting tool space is formed by the relief.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be described, by way of example, with reference to the accompanying drawings in which:

(2) FIG. 1 shows a known inner wear part mounted on a support cone of a cone crusher;

(3) FIG. 2 shows a known inner wear part mounted on a support cone of a gyratory crusher;

(4) FIG. 3 shows an inner wear part according to a first preferable embodiment of the invention;

(5) FIG. 4 shows an inner wear part according to a second preferable embodiment of the invention;

(6) FIGS. 5-8 show inner wear parts according to some preferable embodiments of the invention to which some preferable lifting tools are locked;

(7) FIG. 9 shows a top view of a lifting tool;

(8) FIG. 10 shows a mineral material processing plant comprising a gyratory or cone crusher equipped with an inner wear part according to the invention.

DETAILED DESCRIPTION

(9) In the following description, like numbers denote like elements. It should be appreciated that the illustrated drawings are not entirely in scale, and that the drawings mainly serve the purpose of illustrating some example embodiments of the invention.

(10) FIGS. 3 and 4 show alternative support cones 10 onto which are mounted inner wear parts 11 according to preferable embodiments of the invention. In FIG. 3 a cross section of a torch ring 14 is circular and in FIG. 4 square. No outer lifting points are needed in the wear parts 11 for lifting.

(11) The inner wear part 11 comprises an inner surface to which is formed a first inner support surface 16 which is arranged to be supported by a first counter surface 17 formed to an outer surface 18 of the support cone 10 when the inner wear part is fixed on the support cone.

(12) A second inner support surface 15 is formed to an upper section of the inner surface of the wear part 11. The support surface 15 is arranged, in a lifting phase of the inner wear part, to couple with a second counter surface (for example the second counter surface 38 of a lifting tool 30 in FIG. 5).

(13) The second inner support surface 15 can be a unitary region on the lower inner surface of the inner wear part, for example a circular region. The second inner support surface 15 can be a relief, for example a recess, cavity, segment made to the inner surface. The second inner support surface 15 can consist of at least two reliefs. The second inner support surface 15 can also consist of several separate reliefs, for example of recesses in the inner surface.

(14) In FIGS. 3 and 4 a short distance is formed at a region above the first support surface 16 in between the inner surface of the wear part 11 and the support cone where the inner surface is denoted with referral number 19. A second relief is additionally formed in the upper section of this inner surface region 19 at the location of the second inner support surface 15.

(15) By the term relief is meant in this description reducing of the material of the wear part and/or the support cone in connection with the space in between the support cone and the wear part. A lifting tool space for receiving a lifting arm of the lifting tool is created by the relief in between the inner surface of the inner wear part and the support cone. The relief does not necessary mean reducing of a wall thickness of the wear part at the region of the second inner support surface. The wall of the wear part can also be directed outwards (also approximately uniform in thickness) that a sufficient wall thickness is formed to the wear part and that a sufficient lifting tool space is formed in between the support cone and the wear part for the lifting arm of the lifting tool.

(16) In connection with FIG. 5 there is described an example of a lifting tool 30 which is suitable to be coupled with profiles of the wear parts shown in FIGS. 3 and 4. Examples of other lifting tools applicable with profiles of some other wear parts are shown in connection with FIGS. 6, 7 and 8.

(17) FIGS. 5 and 6 show inner wear parts 11 of a cone crusher and lifting tools 30, 30 coupled therewith. The lifting tool 30, 30 comprises a first lifting arm 31 and a second lifting arm 32 which are pivoted to each other with a pivot 33. The pivot 33 enables pivoting of the lifting arms in relation to each other and adapting into the lifting tool space between the support cone 10 and the wear part 11 when the locking bolt 12 is removed from the support cone 10. If necessary the lifting tool space is emptied from foreign objects. The lifting arms 31, 32 can be locked in a lifting position by placing a pin 34 suitable as a locking member through upper ends 31, 32 of the lifting arms 31, 32 at a point which is located above the pivot 33. The lifting tool comprises a lifting point 35 such as a lifting eye in a top of the one or the other lifting arm to be gripped by a lifting device.

(18) The lifting tool is optionally equipped with a safety device 36 which indicates overload. The safety device comprises a fuse such as a shear pin wherein the operator clearly notices the overload at the break thereof. In connection with the safety device there are formed longitudinal holes 37 for cooperation with the pivot and the pin 34 enabling moving of the pivot and the pin in the holes 37, i.e. a short increase of the distance between the lifting eye and the lifting arms, for example a few millimeters. Naturally the lifting tool can be implemented without the safety device.

(19) When the inner wear part is gripped with the lifting tool, regions of at least two lifting arms 31, 32 of the lifting tool 30, 30 having second counter surfaces 38 are arranged inside the inner wear part and under the inner surface of the wear part, and the upper second counter surface 38 of the lifting arm 31, 32 of the lifting tool 30 is coupled with the second inner support surface 15 of the inner wear part 11 which second inner support surface is formed to the upper section of the inner surface of the wear part.

(20) In case the inner wear part 11 is readily on the support cone 10 and one wants to lift the wear part off the support cone, the lifting arm of the lifting tool is arranged into the lifting tool space between the inner wear part and the support cone which lifting tool space is formed by arranging the relief to the inner surface of the inner wear part and/or to an outer surface of the support cone.

(21) In FIG. 5 the lifting arms 31, 32 of the lifting tool 30 are optionally equipped with limiters 38 which extend around the edge of the opening in the upper end of the inner wear part. I.a. stability of the locking between the lifting tool and the wear part can be increased by the limiters, for example in such a situation when the lifting event is not sufficiently vertical in the initial phase.

(22) In FIG. 6 the lifting arms 31, 32 of the lifting tool 30 are formed hook-like so that the hook-like second counter surfaces 38 couple with the second support surface 15 of the inner wear part 11 having a hook-like cross section. The hook-like shape 15 or a corresponding threshold in the second support surface 15 provides a solution for the lifting of particularly steep inner wear parts. Then the force which is broadening the wear part outwards can be held within reasonable limits. A wedging and sticking of the lifting tool to the wear part can be reduced or eliminated by the hook-like shape or form. A horizontal force component directed to the lifting tool can be eliminated or at least reduced. The hook-like shape or form is formed by a section of the second support surface formed in the second support surface which is in the horizontal direction or over in relation to the lifting direction (the lifting direction is vertical, upwards).

(23) FIGS. 7 and 8 show inner wear parts 21 of a gyratory crusher and lifting tools 40, 40 coupled therewith. FIG. 9 shows a top view of the lifting tool 40, 40. The lifting tool 40, 40 comprises a first lifting arm 41 and a second lifting arm 42 which are pivoted to a support collar 50 with a pivot 43. The support collar surrounds a shaft 23 in a lifting situation and keeps the lifting arms at a fixed distance from each other. The pivot 43 enables pivoting of the lifting arms in relation to each other (for example with handles 51) and adapting into a lifting tool space between the support cone 20 and the wear part 21 when a locking nut 22 is removed from the shaft 23. If necessary the lifting tool space is emptied from foreign objects. The lifting arms 41, 42 can be locked in a lifting position by placing pins 44 suitable as locking members to obstacles for locking arms 41, 42 of the lifting arms 41, 42 at a point which is located at a desired distance from the pivot 43, for example outside the pivot.

(24) The lifting tool comprises transmission members 52 such as chains for transmitting the lifting force above the shaft 23. The transmission members are fixed at their upper ends to a connection structure 53 to which is fixed a lifting point such as a lifting eye to be gripped by a lifting device. The fixing points of the lower ends of the transmission members 52 in the lifting arms 41, 42 are located so that the lifting force of the transmission members presses the locking arms 41, 42 of the lifting arms against the pins 44. The fixing points of the lower ends of the transmission members 52 in the lifting arms 41, 42 are located so that a logging tongs effect can be avoided in the lifting tool 40, 40, i.e. when the load increases there is not directed any increasing pivoting force to the lifting arm which could cause deformations to the lifted wear part.

(25) The lifting tool is optionally equipped with a safety device 46 which indicates overload. The safety device 46 is preferably arranged to the connection structure 53. The connection structure comprises opposite beams 56, 57 pivoted by pivots 55 to a frame 54, where outer ends of the beams have fixing points for the transmission members 52. The safety device 46 comprises a fuse such as a shear pin which is coupled in between an inner nose of the beam and the frame. The operator clearly notices the overload at the break of the shear pin when the overlapping inner noses of the beams 56, 57 move shortly against an obstacle formed to the frame, in case of the figure against the lifting eye 45 supported to the frame 54. Naturally the lifting tool can be implemented also with a unitary beam without the safety device.

(26) When the inner wear part 21 is gripped with the lifting tool, regions of at least two lifting arms 41, 42 of the lifting tool 40, 40 having second counter surfaces 38 are arranged inside the inner wear part and under the inner surface of the wear part, and the upper second counter surface 38 of the lifting arm of the lifting tool is coupled with the second inner support surface 15 of the inner wear part 21 which second inner support surface is formed to the upper section of the inner surface of the wear part.

(27) In case the inner wear part 21 is readily on the support cone 20 and one wants to lift the wear part off the support cone, the lifting arm of the lifting tool is arranged into the lifting tool space between the inner wear part and the support cone which lifting tool space is formed by arranging a relief to the inner surface of the inner wear part and/or to an outer surface of the support cone.

(28) In FIG. 8 the lifting arms 41, 42 of the lifting tool 40 are formed hook-like so that the hook-like second counter surfaces 38 couple with the second support surface 15 of the inner wear part 21 having a hook-like cross section. The hook-like shape 15 or a corresponding threshold in the second support surface 15 provides a solution for the lifting of particularly steep inner wear parts which are present particularly in gyratory crushers. Then the force which is broadening the wear part outwards can be held within reasonable limits.

(29) FIG. 10 shows a mineral material processing plant 100 which is suitable for example to open pits for crushing stone material. A crusher can be operated for example as an intermediate or a secondary crusher. Particularly the crusher can be operated in fine crushing. The processing plant comprises a frame 101 to which is fixed a track base 102 for enabling independent moving. The processing plant comprises a feeder 103 for feeding crushable material to the crusher 105. The feeder preferably also comprises a conveyor 104, and a discharge conveyor 106 for conveying crushed material further to for example a pile beneath the processing plant. Further the processing plant may comprise a power source such as an electric, a diesel or another type motor and a transmission 107 from the power source to the crusher 105.

(30) The feeder may be a lamella feeder or a lamella conveyor, a belt conveyor or a vibrating feeder which may additionally be scalping, separating fine material from the material to be crushed before the crushing.

(31) Instead the track base 102 the moving can be enabled for example also with legs, skids or wheels. The processing plant 100 with the track base can be transported on road on a carriage or a corresponding transport arrangement. With a wheel base it may be towable on road preferably by a truck.

(32) The crusher 105 of the processing plant is preferably any of the cone crusher or gyratory crusher embodiments shown in this description. The crusher 105 can preferably be located to a stationary crushing plant. The processing plant may also be plant operating on water such as a barge, a raft, a ship or for example a plant at the bottom of the sea.

(33) The foregoing description provides non-limiting examples of some embodiments of the invention. It is clear to a person skilled in the art that the invention is not restricted to details presented, but that the invention can be implemented in other equivalent means. Some of the features of the above-disclosed embodiments may be used to advantage without the use of other features.

(34) As such, the foregoing description shall be considered as merely illustrative of principles of the invention, and not in limitation thereof. Hence, the scope of the invention is only restricted by the appended patent claims.