WO2023023766A1

WO2023023766A1 - A wear system

Info

Publication number: WO2023023766A1
Application number: PCT/AU2022/050993
Authority: WO
Inventors: Walter Turner
Original assignee: ACN 632 334 037 Pty Ltd
Priority date: 2021-08-24
Filing date: 2022-08-24
Publication date: 2023-03-02

Abstract

The present invention provides a wear system adapted to be fitted to a rotor wall (111) of a vertical shaft impact crusher such that when fitted thereto the wear system protects an edge section (113, 127) of the rotor wall. The wear system provides a wear tip (115) comprising a first elongate member (135) adapted to be releasably fitted relative to the edge section, and a second elongate member (137) releasably fitted to the first elongate member. The wear tip also comprises a third elongate member (139) and a fourth elongate member (141) wherein both the third elongate member and fourth elongate member are formed from a material having higher wear resistant properties than the first elongate member and the second elongate member. The fourth elongate member is received in a pocket (167) formed between the first elongate member and second elongate member when assembled. The wear system also comprises a wear block (129).

Description

A Wear System

TECHNICAL FIELD

[0001] The present invention generally relates to a wear system for a vertical shaft impact crusher. In particular the present invention relates to a tungsten tip and/or a wear block being wear systems for a vertical shaft impact crusher.

BACKGROUND ART

[0002] Crushers are used in a variety of industries to reduce the size of certain materials. These crushers vary in type and purpose with some crushers particularly suited to crush material of large particle size, while others are better suited to crush material of smaller particle size. One type of crusher which is particularly suited for material of medium to small particle size is a vertical shaft impact (VSI) crusher.

[0003] VSI crushers are typically used in secondary, tertiary or quaternary stage crushing, but can be used as a primary crusher depending on the material to be crushed. The material to be crushed is fed into the centre of a rotor housed in the VSI. The rotor rotates at high speed, ejecting the material by centrifugal force radially outward from the rotor through the rotor outlet ports. The material is ejected from the rotor at high speed into a crushing chamber in the form of a rock shelf. When the material hits the rock shelf or other material particles, it fractures/shatters, before falling through the opening between the rotor and the rock shelf to be collected below. This type of VSI is known as a rock on rock VSI.

[0004] As material is crushed the rock shelf, and some areas of the rotor, accumulate some of the crushed material. This provides an impact barrier/liner and protects those areas in which the material has accumulated. This is known as autogenous crushing. Autogenous crushing occurs inside the crusher chamber between material thrown from rotor and material resting on rock shelf, or by material springing back from the rock shelf.

[0005] Rock on rock VSI’s are recommended when crushing abrasive materials. These materials create areas of wear within the VSI, with the rotor experiencing several areas of high wear. While the outlet ports of the rotor are designed for high wear resistance, the speed at which the material is ejected and the abrasive nature of the material results in the rapid wear of any wear resistant solution, and requires regular replacement (this could be every 5-6 days). [0006] Typical wear protection for a rotor is shown in figures 1 to 4. These figures show a rotor 10 of a VSI having a number of rotor walls 11 and corresponding outlet ports 12. A first edge 13 of the rotor wall 11 at the rotor’s outlet port 12 is fitted with tungsten tips 15. As shown in figure 3 these tungsten tips 15 have a first tungsten insert 19 and a second tungsten insert 21 embedded along the length of the tungsten tips 15. The second tungsten insert 21 provides a back-up in the event the first tungsten insert 19 wears before the worn tungsten tip 13 is replaced. Due to the stream of rock passing through the rotor outlet port 12, the tungsten tips 15 require regular replacement.

[0007] In some arrangements the tungsten tip 15 is bolted to the rotor wall 11 and can be readily replaced. In these arrangements the bolt head is exposed and subject to wear. If this wears before being replaced the tungsten tip 15 can be ejected from the rotor 10. In other arrangements the tungsten tip 15 fits into an opening in a lower wear plate 23 and in a corresponding opening in an upper wear plate 25 to lock the tungsten tip 15 in a position adjacent the first edge 13 of the rotor wall 11. In these arrangements the rotor 10 must be disassembled before the tungsten tip 15 can be removed and replaced.

[0008] . In operation some of the material ejected from the rotor 10 bounces off the crushing chamber and impacts the rotor 10. To provide protection from bounce back a second edge 27 of the rotor wall 11 has a wear block 29 bolted thereto. The wear block 29 protects the rotor wall from impact and abrasion wear. Similar to the tungsten tip 15, the wear block 29 is bolted to the rotor wall 11 or can be fitted into openings in the lower wear plate 23 and upper wear plate 25.

[0009] The replacement of the tungsten tip 15/wear block 29 is required even if only one portion of the tungsten tip 15/wear block 29 wears beyond useful life, and the remainder of the tungsten tip 15/wear block 29 still has a significant service life remaining. This represents a significant waste. Particularly in relation to the tungsten inserts 19, 21 which are embedded in the tungsten tip 15 and may be untouched.

[0010] In some cases an operator will hard face the tungsten tip 15/wear block 29 to either prolong its life, or to repair high wear areas. However, this typically provides a brittle surface which is prone to chipping.

[0011] An arrangement to minimise waste when replacing the tungsten tip 15/wear block 29 is to provide a three piece tungsten tip /wear block. With this arrangement the piece which experiences the most wear can be replaced as required. However, this still generates waste and if the pieces are not properly matched the rate of wear increases. [0012] The preceding discussion of the background art is intended to facilitate an understanding of the present invention only. The discussion is not an acknowledgement or admission that any of the material referred to is or was part of the common general knowledge as at the priority date of the application.

SUMMARY OF INVENTION

[0013] It is an object of this invention to provide a wear system for a vertical shaft impact crusher which ameliorates, mitigates or overcomes, at least one disadvantage of the prior art, or which will at least provide the public with a practical choice.

[0014] The present invention provides a wear system adapted to be fitted to a rotor wall of a vertical shaft impact crusher such that when fitted thereto the wear system protects an edge section of the rotor wall, the wear system provides a wear tip, the wear tip comprises: a first elongate member adapted to be releasably fitted relative to the edge section; a second elongate member releasably fitted to the first elongate member; a third elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member; a fourth elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member, the fourth elongate member being received in a pocket formed between the first elongate member and second elongate member when assembled.

[0015] In contrast to the prior art, the wear tip of the present invention can be removed from the edge section of the rotor and the critically worn components can be replaced, while the other components can be re-used. This minimises considerable waste and cost, particularly where the fourth elongate member can be re-used.

[0016] The present invention further provides a wear system comprising a wear tip adapted to be fitted to a rotor wall of a vertical shaft impact crusher such that when fitted thereto the wear tip protects a first edge section of the rotor wall, the wear tip comprises: a first elongate member adapted to be releasably fitted relative to the first edge section; a second elongate member releasably fitted to the first elongate member; a third elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member. [0017] Upon replacement of the wear tip, components of the wear tip with remaining service life can be re-used.

[0018] The first elongate member may have one or more threaded holes in a rear surface to assist in releasably securing the first elongate member to the rotor wall. Preferably the one or more threaded holes are located in a position such that when fitted to the rotor wall, the fixing means, such as a bolt, is exposed to minimal wear. Preferably the one or more threaded holes are located close to a top protection plate of the rotor. In this region there is less wear compared to a central region. A bolt located in this position is less likely to be damaged to a point that the bolt head wears away, or is damaged to a point it cannot be removed using conventional means. The fixing means may include a rectangular fixing tab which engages the top protection plate of the rotor when the wear block is releasably secured to the rotor wall.

[0019] The second elongate member may have a plurality of spaced holes therethrough which align with corresponding threaded holes in the first elongate member, wherein fasteners may pass through the openings to fasten the first elongate member and second elongate member together. When assembled the axis of the spaced holes may be angularly spaced, preferably perpendicular, to the axis of the one or more threaded holes in the rear surface of the first elongate member.

[0020] When the first elongate member and second elongate member are assembled the wear tip may have a generally rectangular cross section.

[0021] The second elongate member comprises a wear portion adapted to extend into an outlet port of the rotor when the wear tip is fitted thereto. The wear portion may extend along at least a portion of the length of the second elongate member, preferably the entire length. The wear portion may have a first surface.

[0022] The third elongate member may be received in a channel formed in the wear portion of the second elongate member. The channel may have an opening in the first surface.

[0023] The third elongate member may be fixed or otherwise embedded in the channel. The third elongate member may provide a portion of the first surface of the wear portion. The third elongate member may be fixed in the channel by brazing. Alternatively the third elongate member may be glued in the channel.

[0024] The third elongate member may be made from tungsten. [0025] Preferably the wear tip comprises a fourth elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member, the fourth elongate member being received in a pocket formed between the first elongate member and second elongate member when assembled. The fourth elongate member provides a back up to the third elongate member in the event that the third elongate element, or parts thereof, have worn away.

[0026] The first elongate member may have a recess extending along at least a portion of an outer edge thereof. The recess may co-operate with the second elongate member to define the pocket once assembled.

[0027] The fourth elongate member may be formed from a plurality of smaller elongate members.

[0028] The fourth elongate member may be made from tungsten.

[0029] The wear system may also comprise a wear block adapted to be fitted to the rotor wall such that when fitted thereto the wear block protects a second edge section of the rotor wall.

[0030] The present invention further provides a wear tip adapted to be releasably fitted to a vertical shaft impact crusher, the wear tip comprises: a first elongate member; a second elongate member releasably fitted to the first elongate member the second elongate member having a wear portion extending therealong, the wear portion providing a wear surface; a third elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member, the third elongate member being embedded in the wear portion and having a surface which provides at least a part of the wear surface.

[0031] Upon replacement of the wear tip, components of the wear tip with remaining service life can be re-used [0032] The present invention further provides a wear tip adapted to be releasably secured to a rotor of a vertical shaft impact crusher, the wear tip comprises: a first elongate member; a second elongate member releasably fitted to the first elongate member, the second elongate member having a wear portion extending therealong, the wear portion providing a wear surface; a third elongate member embedded in the wear portion and having a surface which provides at least a part of the wear surface.

[0033] Preferably the wear tip comprises a fourth elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member, the fourth elongate member being received in a pocket formed between the first elongate member and second elongate member when assembled.

[0034] The first elongate member may provide a reusable tip carrier.

[0035] The second elongate member may provide a replaceable tip.

[0036] The third elongate member may provide a primary tungsten tip.

[0037] The fourth elongate member may provide a back-up tungsten tip.

[0038] The present invention further provides a wear system comprising a wear block adapted to be fitted to a rotor wall of a vertical shaft impact crusher such that when fitted thereto the wear block protects a second edge section of the rotor wall, the wear block comprises: a carrier block in the form of an elongate member, the carrier block is adapted to be releasably fitted relative to the second edge section; a block tip in the form of an elongate member releasably fitted to the carrier block.

[0039] Upon replacement of the wear tip, components of the wear block with remaining service life can be re-used. [0040] The present invention further provides a wear system comprising a wear block for a vertical shaft impact crusher, the wear block comprises: a carrier block adapted to be releasably fitted relative to a second edge section of a rotor of the crusher; a block tip releasably fitted to the carrier block; whereupon replacement of the wear block, components of the wear block with remaining service life can be re-used.

[0041] The carrier block may have a protective plate secured to an exposed surface thereof. The protective plate may be formed from material having higher wear resistant properties than the carrier block.

[0042] The block tip may be formed from a material having higher wear resistant properties than the carrier block.

[0043] The carrier block may have a plurality of spaced holes therethrough which align with threaded holes in the block tip, wherein assembly fasteners may pass through the openings to fasten the carrier block and block tip in an assembled configuration.

[0044] The carrier block may have one or more threaded holes in a rear surface to assist in releasably securing the first elongate member to the rotor wall. Preferably the one or more threaded holes are located in a position such that when fitted to the rotor wall, a fixing means, such as a bolt, is exposed to minimal wear. Preferably the one or more threaded holes are located close to a top protection plate of the rotor. In this region there is less wear compared to a central region. A fixing bolt located in this position is less likely to be damaged to a point that the bolt head wears away, or is damaged to a point it cannot be removed using conventional means. The fixing means may include a rectangular fixing tab which engages the top protection plate of the rotor when the wear block is releasably secured to the rotor wall.

[0045] The axis of the plurality of spaced holes in the carrier block may be parallel to the axis of the one or more threaded holes in the rear surface of the carrier block.

[0046] The wear system may comprise a wear tip adapted to be fitted to the rotor wall such that when fitted thereto the wear tip protects a first edge section of the rotor wall. The wear tip may be as herein described. [0047] The present invention further provides a wear block for a vertical shaft impact crusher, the wear block comprises: a carrier block adapted to be releasably fitted relative to a second edge section of a rotor of the crusher; a block tip releasably fitted to the carrier block; whereupon replacement of the wear block, components of the wear block with remaining service life can be re-used.

[0048] The present invention provides a vertical shaft impact crusher having one ore more of the following secured thereto, in singular or multiples: a wear system as herein described, a wear tip as herein described, a wear block as herein described.

[0049] The present invention provides a rotor having one or more of the following secured thereto, in singular or multiples: a wear system as herein described, a wear tip as herein described, a wear block as herein described.

BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Further features of the present invention are more fully described in the following description of a non-limiting embodiment thereof. This description is included solely for the purposes of exemplifying the present invention. It should not be understood as a restriction on the broad summary, disclosure or description of the invention as set out above. The description will be made with reference to the accompanying drawings in which:

Figure 1 is a perspective view of a rotor from a vertical shaft impact crusher, the figure representing prior art;

Figure 2 is a perspective view of a rotor in a vertical shaft impact crusher, the figure representing prior art;

Figure 3 is a perspective view of a tungsten tip according to the prior art;

Figure 4 is a perspective view of a wear block according to the prior art;

Figure 5 is a schematic plan view of a rotor having a wear system according to a first embodiment of the present invention fitted thereto;

Figure 6 is an exploded perspective view of a wear tip as secured to the rotor of figure 5; Figure 7 is a cross-sectional view of figure 6 once assembled; and

Figure 8 is an exploded perspective view of a wear block as secured to the rotor of figure 5.

[0051] In the drawings like structures are referred to by like numerals throughout the several views. The drawings shown are not necessarily to scale, with emphasis instead generally being placed upon illustrating the principles of the present invention.

DESCRIPTION OF EMBODIMENTS

[0052] Embodiments of the present invention seek to improve the utilisation of wear items used to protect a rotor of a vertical shaft impact crusher. In particular the present embodiment provides a wear system comprising a wear tip and wear block having the advantageous features that only those parts which have experienced critical wear need to be replaced, allowing for those components with useful life to be re-used.

[0053] The wear tips of the present invention are able to be dismantled and specific parts replaced as required when their service limit is reached. This is in contrast to the prior art where wear tips/tungsten tips are a unitary component and are entirely disposed of when the tungsten insert on the leading corner reaches its service limit. This results in high replacement cost and scrap metal waste production. Advantageously, the wear blocks of the present embodiment are also able to be refurbished by only replacing the block tip of the block when it wears to its service limit. Again this is in contrast to the prior art where the entire wear block requires total replacement when worn.

[0054] A plan view of a rotor 110, minus its top protection plate, is shown in figure 5. The rotor 110 comprises three rotor walls 111 which define three outlet ports 112. Arrows “A” show the travel of the material from the central receiving region of the rotor 10 through the outlets 112.

[0055] The rotor walls 111 each have a first edge section 113 and a second edge section 127. Releasably secured to the first edge section 113 of each rotor wall 111 is a wear tip 115. Releasably secured to the second edge section 127 of each rotor wall 111 is a wear block 129. Each of these items protects the rotor wall to ensure rotor longevity.

[0056] Figure 5 also illustrates how material 131 accumulates in the rotor. Each rotor wall 111 incorporates a plate 133. The plate 133, the wear tip 115 and the portion of the rotor wall therebetween co-operate to allow for the accumulation of material 131. The accumulated material 131 provides a liner protecting that portion of the rotor wall from impact and wear. [0057] Figure 5 also shows that, even though accumulated material 131 is protecting the wear tip 115, a portion of the wear tip 115 remains exposed to the material being ejected from the rotor. This exposed portion experiences significant wear and regular replacement is required.

[0058] The wear tip 115 according to the first embodiment of this invention is represented in figures 6 and 7. Each wear tip 115 comprises a first elongate member in the form of a reusable tip carrier 135, a second elongate member in the form of a replaceable tip 137, a third elongate member in the form of a primary tungsten tipi 39 and a fourth elongate member in the form of a back-up tungsten tip 141. It is to be noted that the back-up tungsten tip 141 provides a safeguard in the event that the wear tip 115 is not replaced before the primary tungsten tip 139, or a portion thereof, wears through. For instance, this will occur when wear passes wear line “B” as represented in figure 7.

[0059] The reusable tip carrier 135 of the wear tip 115 is adapted to be releasably secured to the first edge section 113 of the rotor wall 111. In so doing the wear tip 115 is releasably secured to the rotor wall 111. The reusable tip carrier 135 has a threaded hole 143 formed through an upper portion of the rear surface 145. In this embodiment the reusable tip carrier 135 also has a threaded hole 147 formed through a central portion of the rear surface 145. This allows the wear tip 115 to be fitted to rotors having a central attachment configuration.

[0060] The reusable tip carrier 135 is releasably secured to the first edge section 113 with a fixing means, in the form of a bolt 149. The fixing means also incorporates a square tab 151. The bolt 149 passes through the square tab 151 and an opening in the rotor wall 111 before the bolt 149 threadingly engages the hole 143 in the reusable tip carrier 135. . Once installed the square tab 151 engages with the top protection plate (not shown) to ensure integrity of the fixing means.

[0061] The reusable tip carrier 135 provides a recess 153 which extends along a large portion of a front edge 155 of the reusable tip carrier 135, for reasons which will be discussed below.

[0062] As shown in figure 6, the reusable tip carrier 135 and the replaceable tip 137 both have complementary L-shaped cross sections, such that when they are assembled they have a generally rectangular cross section, as shown in figure 7. This allows the back-up tungsten tip 141 to be captured therebetween without the need of attaching the back-up tungsten tip 141 to either component. [0063] The replaceable tip 137 provides a wear portion 157 extending therealong. The wear portion 157 incorporates a channel 159 in which the primary tungsten tip 139 is received and fixed in place by brazing. The wear portion 157 and the primary tungsten tip 139 co-operate to provide a wear surface 161 . The wear surface 161 is exposed to the material as it flows through the outlet ports 112. The primary tungsten tip 139 increases the wear resistance of the exposed wear portion 157 prolonging its service life.

[0064] When the wear tip 115 is assembled the recess 153 of the reusable tip carrier 135 cooperates with a side surface 163 of the wear portion 157 and a mating surface 165 of the replaceable tip 137 to define a pocket 167. During assembly the back-up tungsten tip 141 is placed in the recess 153 and is then contained within the wear tip 115 once the reusable tip carrier 135 and the replaceable tip 137 are fixed together. In use the back-up tungsten tip 141 is not exposed to wear until the wear portion 157 wears beyond the wear line B. If the wear tip is replaced prior to this then the back-up tungsten tip 141 can be re-used.

[0065] The replaceable tip 137 has a set of three spaced openings 169 therethrough. During assembly of the wear tip 115, these openings 169 are caused to align with corresponding threaded holes 171 in the reusable tip carrier 135. Once aligned bolts 173 can be used to secure the assembly of the wear tip 115.

[0066] As shown in figure 6, the upper and lower ends of the replaceable tip 137 have chamfered corners 175. This assists in the installation of the wear tip 115.

[0067] In this embodiment the wear system as applied to the rotor 110 also includes wear blocks 129 releasably secured to the second edge section 127 of each rotor wall 111.

[0068] Referring to figure 8, each wear block 129 comprises a carrier block 177 and a replaceable block tip 179. The block tip 179 is releasably secured to the carrier block 177 such that when it wears past its useful life the block tip 179 can be removed and replaced while the carrier block 177 can be re-used. This eliminates significant waste of materials which would otherwise be scrapped.

[0069] The carrier block 177 is releasably secured to the second edge section 127 of the rotor wall with a fixing means, in the form of a bolt 149. The fixing means also incorporates a square tab 151 . The bolt 149 passes through the square tab 151 and an opening in the rotor wall 111 before the bolt 149 threadingly engages a threaded hole 181 in the carrier block 177. Once installed the square tab 151 engages with the top protection plate (not shown) to ensure integrity of the fixing means. [0070] The carrier block 177 has a set of four spaced openings 183 therethrough. During assembly of the wear block 129, these openings 183 are caused to align with corresponding threaded holes 171 in the carrier block 185. Once aligned, bolts 173 can be used to secure the assembly of the wear block 129. As shown in figure 8, the axis of the spaced openings 183 is parallel to threaded hole 181.

[0071] While the replaceable block tip 179 is made from a material with better wear properties compared to the carrier block 177, the carrier block 177 supports a wear plate 187 to provide wear and impact protection.

[0072] Modifications and variations such as would be apparent to the skilled addressee are considered to fall within the scope of the present invention. The present invention is not to be limited in scope by any of the specific embodiments described herein. These embodiments are intended for the purpose of exemplification only. Functionally equivalent products, formulations and methods are clearly within the scope of the invention as described herein. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

[0073] Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well- known technologies are not described in detail.

[0074] Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

[0075] The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.

[0076] Reference to positional descriptions and spatially relative terms), such as “inner,” “outer,” “beneath”, “below”, “lower”, “above”, “upper” and the like, are to be taken in context of the embodiments depicted in the figures, and are not to be taken as limiting the invention to the literal interpretation of the term but rather as would be understood by the skilled addressee.

[0077] Although the terms first, second, third, etc. may be used herein to describe various members, components, regions, layers and/or sections, these members, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one member, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first member, component, region, layer or section discussed below could be termed a second member, component, region, layer or section without departing from the teachings of the example embodiments.

[0078] It will be understood that when an member is referred to as being “on”, “engaged”, "connected" or "coupled" to another member/layer, it may be directly on, engaged, connected or coupled to the other member/layer or intervening members/layers may be present. Other words used to describe the relationship between members/layers should be interpreted in a like fashion (e.g., “between”, “adjacent”). As used herein the term "and/or" includes any and all combinations of one or more of the associated listed items.

[0079] The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a”, “an” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprise”, “comprises,” “comprising,” “including,” and “having,” or variations thereof are inclusive and therefore specify the presence of stated features, integers, steps, operations, members, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, members, components, and/or groups thereof.

Claims

1 . A wear system adapted to be fitted to a rotor wall of a vertical shaft impact crusher such that when fitted thereto the wear system protects an edge section of the rotor wall, the wear system provides a wear tip, the wear tip comprises: a first elongate member adapted to be releasably fitted relative to the edge section; a second elongate member releasably fitted to the first elongate member; a third elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member; a fourth elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member, the fourth elongate member being received in a pocket formed between the first elongate member and second elongate member when assembled.

2. A wear system comprising a wear tip adapted to be fitted to a rotor wall of a vertical shaft impact crusher such that when fitted thereto the wear tip protects a first edge section of the rotor wall, the wear tip comprises: a first elongate member adapted to be releasably fitted relative to the first edge section; a second elongate member releasably fitted to the first elongate member; a third elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member.

3. The wear system according to claim 1 or 2 wherein the first elongate member has one or more threaded holes in a rear surface to assist in releasably securing the first elongate member to the rotor wall.

4. The wear system according to claim 3 wherein the one or more threaded holes are located close to a top protection plate of the rotor.

5. The wear system according to claim 4 wherein a fixing means which secures the wear tip to the rotor wall includes a rectangular fixing tab which engages the top protection plate of the rotor when the wear block is releasably secured to the rotor wall. The wear system according to any one of the preceding claim wherein the second elongate member has a plurality of spaced holes therethrough which align with threaded holes in the first elongate member, wherein fasteners pass through the openings to fasten the first elongate member and second elongate member together. The wear system according to any one of the preceding claim wherein the second elongate member comprises a wear portion adapted to extend into an outlet port of the rotor when the wear tip is fitted thereto. The wear system according to claim 7 wherein the wear portion extends along at least a portion of the length of the second elongate member, wherein the wear portion provides a first surface. The wear system according to claim 7 or 8 wherein the third elongate member is received in a channel formed in the wear portion of the second elongate member. . The wear system according to claim 9 wherein the channel has an opening in the first surface. .The wear system according to claim 9 or 10 wherein the third elongate member is fixed or otherwise embedded in the channel. . The wear system according to claim 11 wherein the third elongate member is fixed in the channel by one of brazing or gluing. .The wear system according to any one of claims 2 to 13 wherein the wear tip comprises a fourth elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member, the fourth elongate member being received in a pocket formed between the first elongate member and second elongate member when assembled; . The wear system according to claim 13 wherein the first elongate member has a recess extending along at least a portion of an outer edge thereof, the recess co-operates with the second elongate member to define the pocket, once assembled. . The wear system according to claim 1 , 13 or 14 wherein the fourth elongate member is formed from a plurality of smaller elongate members. .The wear system according to any one of the preceding claim wherein the first elongate member provides a reusable tip carrier. 16 .The wear system according to any one of the preceding claim wherein the second elongate member provides a replaceable tip. .The wear system according to any one of the preceding claim wherein the third elongate member provides a tungsten tip. . The wear system according to claims 1 , 13, 14, 15, 17 or 18 wherein the fourth elongate member provides a back-up tungsten tip. .The wear system according to any one of the preceding claims further comprising a wear block adapted to be fitted to the rotor wall such that when fitted thereto the wear block protects a second edge section of the rotor wall. .A wear tip adapted to be releasably fitted to a vertical shaft impact crusher, the wear tip comprises: a first elongate member; a second elongate member releasably fitted to the first elongate member the second elongate member having a wear portion extending therealong, the wear portion providing a wear surface; a third elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member, the third elongate member being embedded in the wear portion and having a surface which provides at least a part of the wear surface; whereupon replacement of the wear tip, components of the wear tip with remaining service life can be re-used. .A wear tip adapted to be releasably secured to a rotor of a vertical shaft impact crusher, the wear tip comprises: a first elongate member; a second elongate member releasably fitted to the first elongate member, the second elongate member having a wear portion extending therealong, the wear portion providing a wear surface; a third elongate member embedded in the wear portion and having a surface which provides at least a part of the wear surface. 17 The wear tip according to claim 21 or 22 further comprising a fourth elongate member formed from a material having higher wear resistant properties than the first elongate member and the second elongate member, the fourth elongate member being received in a pocket formed between the first elongate member and second elongate member when assembled. The wear tip according to any one of claims 21 to 23 wherein the first elongate member provides a reusable tip carrier. The wear tip according to any one of claims 21 to 24 wherein the second elongate member provides a replaceable tip. The wear tip according to any one of claims 21 to 25 wherein the third elongate member provides a tungsten tip. The wear tip according to any one of claims 21 to 26 wherein the fourth elongate member provides a back-up tungsten tip. A wear system comprising a wear block adapted to be fitted to a rotor wall of a vertical shaft impact crusher such that when fitted thereto the wear block protects a second edge section of the rotor wall, the wear block comprises: a carrier block in the form of an elongate member, the carrier block is adapted to be releasably fitted relative to the second edge section; a block tip in the form of an elongate member releasably fitted to the carrier block;. A wear system comprising a wear block for a vertical shaft impact crusher, the wear block comprises: a carrier block is adapted to be releasably fitted relative to a second edge section of a rotor of the crusher; a block tip releasably fitted to the carrier block; whereupon replacement of the wear block, components of the wear block with remaining service life can be re-used. The wear system according to claims 29 wherein the carrier block has a protective plate secured to an exposed surface thereof. 18 .The wear system according to claims 29 or 30 wherein the block tip is formed from a material having higher wear resistant properties than the carrier block. .The wear system according to claims 29, 30 or 31 wherein the carrier block has a plurality of spaced holes therethrough which align with threaded holes in the block tip, wherein assembly fasteners pass through the openings to fasten the carrier block and block tip in an assembled configuration. .The wear system according to any one of claims 29 to 31 wherein the carrier block has one or more threaded holes in a rear surface to assist in releasably securing the first elongate member to the rotor. .The wear system according to claims 33 wherein the one or more threaded holes are located close to a top protection plate of the rotor. . The wear system according to claims 33 or 34 wherein a fixing means, which secures the wear block to the rotor includes a rectangular fixing tab which engages the top protection plate of the rotor when the wear block is releasably secured to the rotor wall. .The wear system according to any one of claims 28 to 35 further comprising a wear tip adapted to be fitted to the rotor such that when fitted thereto the wear block protects a first edge section of the rotor wall. .A wear block for a vertical shaft impact crusher, the wear block comprises: a carrier block is adapted to be releasably fitted relative to a second edge section of a rotor of the crusher; a block tip releasably fitted to the carrier block; whereupon replacement of the wear block, components of the wear block with remaining service life can be re-used. . A vertical shaft impact crusher having one or more of the following secured thereto in singular or multiples: a wear system according to any one of claims 1 to 20, 28 to 36, a wear tip according to any one of claims 21 to 27, a wear block according to claim 37. .A rotor of a vertical shaft impact crusher having one or more of the following secured thereto in singular or multiples: a wear system according to any one of claims 1 to 20, 28 to 36, a wear tip according to any one of claims 21 to 27, a wear block according to claim 37.