Scraper blade for cone crusher

Abstract

In one aspect there is provided scraper (140) for a crusher (100), comprising a flexible blade member (141) having a first end portion (114) configured for operative coupling with a rotatable shaft (110) of the crusher (100), and a forward face (118) adapted to face in a rotation direction (S) of the shaft (110), and a second end portion (116) provided with at least one ploughing member (142) projecting from the forward face (118).

Description

TECHNICAL FIELD

[0001] The disclosure pertains to a scraper blade for a crusher, such as a cone crusher, and in particular a scraper blade for removing earth material at such crusher.BACKGROUND

[0002] In certain cone crushers, hydraulic pressure is utilized to regulate the close side setting (CSS), which refers to the gap between the inner mantle and the outer concave. This adjustment mechanism involves the vertical movement of the main shaft and inner mantle to achieve a specific CSS value, all controlled by the crusher's control system.

[0003] In the event of an uncrushable object, commonly referred to as 'tramp iron,' entering the crushing chamber, the control system promptly detects it and initiates a rapid release of hydraulic pressure. This action prompts the main shaft and inner mantle to descend, thereby creating additional space within the crushing chamber. This adjustment prevents damage to the machine and its components by allowing the uncrushable object to pass through safely.

[0004] Moreover, issues may arise when feed material, containing fine materials and moisture, causes material buildup on the dust collar. In such cases, it is imperative that the space between the dust collar and the retaining ring remains unobstructed, particularly when the crusher is instructed to lower the main shaft and inner mantle to accommodate an uncrushable object.

[0005] In response to the above detailed challenges, the inventor of the present disclosure has devised a concept which makes a constructive contribution to the art.SUMMARY

[0006] In a first aspect there is provided a scraper for a crusher, such as a cone crusher or a gyratory crusher, comprising a flexible blade member having a first end portion configured for operative coupling with a rotatable shaft of the crusher, and a forward face adapted to face in a rotation direction of the shaft, and a second end portion provided with at least one ploughing member projecting from the forward face.

[0007] The shaft may be a centrally arranged main shaft of the crusher.

[0008] The scraper may be configured to displace earth material, such as moist earth material, from the crusher, such as from a dust collar of the crusher.

[0009] In some embodiments the at least one ploughing member is adapted to displace earth material in a direction transverse the rotation direction in response to rotation of the shaft and engagement of the second end portion with earth material, such as agglomerated earth material, for example moist earth material collected on the dust collar.

[0010] In some embodiments the scraper is configured to obtain a flexed position, such as in response to a movement of the first end portion in the rotation direction and an oppositely directed force acting on the second end position, such as in response to said engagement of the second end portion with the earth material.

[0011] In some embodiments, in the flexed position, a portion of the forward face at the second end portion faces in an axially downwards direction of the rotatable shaft.

[0012] In some embodiments the rotatable shaft is operatively coupled to at least one rotatable mantle of the crusher, and optionally to a retaining ring for retaining one or more of the at least one rotatable mantle, and wherein the first end portion is configured to be operatively coupled to one or more of the at least one mantle and the retaining ring. For example, the first end portion may be configured to be coupled to the retaining ring.

[0013] In some embodiments the at least one ploughing member is adapted to the displace earth material in a radial direction of the shaft in response to rotation of the main shaft in the rotation direction, such as when the scraper is arranged in the flexed position.

[0014] In some embodiments the scraper is configured to be juxtaposed at least partially immediately below the at least one mantle when operatively coupled to the main shaft.

[0015] In some embodiments the ploughing member comprises a mouldboard, wherein at least a portion of the mouldboard is arranged with a first angle, relative the longitudinal extension of the scraper, preferably the first angle is an acute angle. Preferably, a substantial portion or essentially the entire mouldboard is arranged with said first angle relative the longitudinal extension of the scraper.

[0016] In some embodiments the ploughing member comprises a cutting edge, wherein at least a portion of the cutting edge is arranged with a first angle, relative the longitudinal extension of the scraper, preferably the first angle is an acute angle. Preferably, a substantial portion or essentially the entire cutting edge is arranged with said first angle relative the longitudinal extension of the scraper.

[0017] In some embodiments at least a portion of the mouldboard is arranged with a second angle, relative the width-wise extension of the scraper, preferably the second angle is an acute angle.

[0018] In some embodiments at least a portion of the ploghshare is arranged with a second angle, relative the width-wise extension of the scraper, preferably the second angle is an acute angle.

[0019] In some embodiments at least a portion of the second end portion tapers in the plane of the flexible blade member.

[0020] In some embodiments the crusher further comprises a dust collar juxtaposed at least partially immediately below one or more of the at least one rotatable mantle and the retaining ring, and wherein the scraper is adapted to extend between the at least one rotatable mantle and / or retaining ring and the dust collar.

[0021] In some embodiments the scraper is configured to be fixedly attached to the retaining ring.

[0022] In some embodiments the scraper comprises a plurality of ploughing members, such as at least two.

[0023] In some embodiments a respective mouldboard of the at least one ploughing member is one of substantially straight or curved, such as convex or concave.

[0024] In some embodiments a respective cutting edge of the at least one ploughing member is one of substantially straight or curved, such as convex or concave.

[0025] In some embodiments a width of the ploughing member extends along at least 50 % of a width of the scraper, preferably at least 70 %, more preferably at least 80 %.

[0026] In some embodiments the ploughing member comprises a material different to the material of the flexible blade member.

[0027] In some embodiments the ploughing member comprises one or more of rubber, fabric reinforced rubber, polyurethane, ceramics or metallic materials.

[0028] In some embodiments the flexible blade member comprises a polymeric material, such as rubber, fabric reinforced rubber, polyurethane or similar.

[0029] In some embodiments a stiffness of the flexible blade member is in the range of Shore A 40° to Shore A 90°.

[0030] In some embodiments the flexible blade member is made of rubber and has a stiffness of Shore A 40° to Shore A 80°.

[0031] In some embodiments the flexible blade member is made of Polyurethane and has a stiffness of Shore A 50° to Shore A 90°.

[0032] In some embodiments a stiffness of the flexible blade member is at least Shore A 60°, such as Shore A 70°.

[0033] In some embodiments the cutting edge forms a fourth angle with the front face, such as a right angle or an obtuse angle.

[0034] In some embodiments a thickness of the flexible blade member is in the range of 5 to 25 millimeter.

[0035] In some embodiments the ploughing member projects a distance from the front face in the thickness direction of the scraper, wherein the distance is in the range of 5 to 25 millimeter.

[0036] In some embodiments the dust collar tapers in an axial direction of the crusher, such as an axially upwards direction, and wherein the second end portion tapers with a third angle such as to substantially align with an upper surface of the dust collar.

[0037] In some embodiments a thickness of the flexible blade member is in the range of 5 to 25 millimeter.

[0038] In a second aspect there is provided a crusher, such as a cone crusher, comprising at least one scraper according to any embodiment of the first aspect.

[0039] As such, certain embodiments of the present disclosure may facilitate improved scraping abilities.

[0040] In a second aspect there is provided a crusher, such as a cone crusher, comprising at least one scraper, such as at least two, according to embodiments of the first aspect.

[0041] In some embodiments the scraper is fixedly attached to one or more of the at least one mantle and the retaining ring.

[0042] The aforementioned embodiments are associated with a number of advantages. As such, certain embodiments of the disclosure may facilitate penetration of the scraper, in particular the ploughing members, into agglomerated earth material. In addition, certain embodiments may provide improved scraping effect when applied to moist earth material. Moreover, some embodiments may facilitate efficient displacement of earth material away from the crusher.BRIEF DESCRIPTION OF DRAWINGS

[0043] Example embodiments will be described in more detail to the following figures, in which: FIG. 1a shows details of a known cone crusher. FIG. 1b shows details of the crusher of FIG. 1. FIG. 2 shows a known scraper blade for a crusher. FIG. 2a shows a side view of the known scraper. FIG. 2b shows a front view of the known scraper of FIG. 2a. FIG. 3a shows a side view of the scraper blade according to an example embodiment of the disclosure. FIG. 3b shows a front view of the embodiment of FIG. 3a. FIG. 4 shows a crusher according to an embodiment. FIG. 5 is a schematic cross view of a function of the known scraper blade. FIG. 6 is a schematic cross view of a function of the scraper blade according to an example embodiment of the disclosure. FIG. 7 shows details of the crusher of FIG.4. FIG. 8 shows a side view of the scraper blade according to an example embodiment of the disclosure. FIG. 9 shows a front view of the scraper blade according to an example embodiment of the disclosure. FIG. 10 shows a front view of the scraper blade according to an example embodiment of the disclosure. FIG. 11 shows a front view of the scraper blade according to an example embodiment of the disclosure. DETAILED DESCRIPTION

[0044] Referring to FIG.1a and FIG.1b, there is shown a known crusher 100' comprising a known scraper 140'. The crusher may, for example, be a cone crusher or a gyratory crusher for crushing earth material, such as ore. The crusher comprises an outer concave (not shown) and an inner mantle 104' defining there between the CSS. The inner mantle 104' is supported by a supporting mantle (not shown) operatively coupled to a rotatable main shaft 110' and attached at its lower end to a retaining ring 106'. Accordingly, the inner mantle 104' is brought into rotation in response to rotation of the main shaft 110' in a forward direction S'. A dust collar 108' is provided immediately below the inner mantle 104' for preventing material ingress.

[0045] With added reference to FIG. 2a and FIG. 2b, a known scraper 140' extends from a fixedly attached end at the inner mantle 104' in a downwards direction towards a scraper free end at the dust ring 108'. The known scraper is in this case attached to the retaining ring 106'. By this arrangement, the known scraper may slidingly engage with earth material agglomerate 130' on the stationary dust ring 108' upon rotation of the main shaft. As is illustrated in FIG. 5, the known flat scraper blade has limited capability to remove earth material from the underlaying surface 108'. The flat surface of the forward face of the known scraper may slide only on top of the schematically illustrated build-up agglomerate of earth material 130'.

[0046] The wear parts within the crusher, such as inner mantle 104' and outer concave, will gradually wear. As this wear occurs, the main shaft 110' an inner mantle 104' will move upwards, and the scraper blade 140' will assume a more upright position as shown for example in FIG. 1b. The scraper blade 140' will lose contact force F' and the scraping capability will decrease. The contact force F' indicated in FIG. 5 may be proportional to a stiffness of the scraper blade 140'.

[0047] Now referring to FIG. 3a and FIG. 3b, a scraper 140 according to an exemplary embodiment of the disclosure is shown. By adding protruding members in shape of one or more ploughing members 142 to the flat scraper blade, protruding edges of the plough members may plough through agglomerated earth material 130, whereby removal of at least part of the earth material from the crusher may be facilitated. The ploughing effect may be most noticeable when the distance between the retaining ring 106 and dust collar 108 is the smallest, for example when a new set of crusher wear liners; inner mantle and outer concave are installed.

[0048] In the embodiment shown, ploughing member 142 comprises an obround or stadium shaped cross section, as seen in the plane P of the resilient blade member 141. In the embodiment shown, the ploughing member 142 comprises a substantially rectangular cross section in a plane transverse plane of the ploughing member, such as a plane transverse the longitudinal extension of the obround shape.

[0049] With added reference to FIG. 4, an example crusher 100 with which embodiments can be deployed is shown. The crusher 100 may comprise one or more or all of the features of the known crusher 100'.

[0050] The scraper 140 comprises a flexible blade member 141 having a forward face 118 and a rearward face 120. With added reference to FIG. 7, a first end portion 114 of the scraper 140 is configured to be coupled to the crusher 100. In the embodiment shown, the scraper 140 extends from the coupled first end portion 114 and terminates at a second end portion at the dust collar 108. At least a portion of the second end portion 116 is tapered such as to align with an upper surface of the dust collar 108. In the embodiment shown, the second end portion 116 is opposite the first end portion 114.

[0051] The flexible blade member 141 may be substantially rectangular. The flexible blade member 141 may be substantially flat and extending in plane P as shown in FIG. 3a. The flexible blade 141 member may be substantially rectangular with a tapered second end portion 116.

[0052] The scraper 140 may comprise means for operatively coupling the scraper to the crusher, such as the retaining ring 108. The means for operatively coupling may be provided in shape of one or more through hole 148, for example extending through the flexible blade member 141.

[0053] The second end portion 116 of the scraper 140 is provided with at least one ploughing member 142 projecting from the forward face 118, such as in a direction normal N to the forward face 118. The forward face 118 is configured to face in the rotation direction S in which the inner mantle 104 is brough to rotate during operation of the crusher 100. The rotation direction S may be seen as a tangential direction of movement of the mantle 104.

[0054] The at least one ploughing member 142 is adapted to, during use with the crusher 100, displace earth material 130 in a direction transverse Tv the rotation S direction of the scraper 140 as shown in FIG. 3b, where it is appreciated that the rotation direction S point out from the drawing. The transverse direction Tv is orthogonal the normal N of the forward face 118 and the length L direction of the scraper 140.

[0055] As mentioned hereinbefore, the crusher 100 comprises a rotatable shaft 110, such as a centrally arranged main shaft. The first end portion is 114 configured to be operatively coupled to the shaft 110.

[0056] The at least one ploughing member 142 is adapted to the displace earth material 130 in a radial direction R of the shaft 110 in response to rotation of the shaft 110 in the forward S direction.

[0057] The crusher 100 further comprises at least one rotatable mantle 104, 105, such as supporting mantle 105 and outer mantle104. The ploughing member 142 is configured to be juxtaposed at least partially immediately beneath the at least one mantle 104, 105, as shown inter alia in FIG. 7.

[0058] The respective ploughing members comprises respective mouldboard 144 and cutting edge 145. The cutting edge 145 may be seen as a ploughshare. The mouldboard 144 may terminate at the cutting edge 145. In other words, the cutting edge 145 may constitute an edge of the mouldboard 144. The cutting edge 145 may be a leading edge in relation to the rotation direction and / or a forward direction of the scraper 140, at least in a flexed position of the scraper, as will be further elucidated herein.

[0059] The mouldboard 144 may be seen as a leading face or leading surface, such as in the flexed position. The moldboard may be configured to push earth material in front of it in response to a movement of the scraper 140 in the rotation direction S, that is, a forward direction of the scraper.

[0060] The cutting edge 145 may be seen as a leading edge such as in the relaxed position and / or in the flexed position.

[0061] Further to FIG. 3a, the mouldboard 144 forms a fourth angle a4 with the forward face 118. In the instant embodiment the fourth angle is a right angle. However, in some embodiments the fourth angle a4 may be an obtuse angle, that is, greater than 90 degrees yet less than 180 degrees. The fourth angle a4 being an obtuse angle may facilitate the ploughing member 142 sliding over stationary elements of the crusher 100, such as bolt heads projecting from the dust collar 108, without hooking on to them.

[0062] The mouldboard 144 is arranged angled relative the longitudinal or length extension L of the scraper 140, such as by a first angle a1, as seen in a plane parallel the plane P of the flexible blade member 141. The first angle a1 may be an acute angle.

[0063] Alternatively, or in addition, the mouldboard 144 may in the flexed position be arranged angled relative the rotation direction S, such as by the first angle a1.

[0064] Alternatively, or in addition, the cutting edge 145 is arranged angled relative the rotation direction S, such as by the first angle a1.

[0065] The mouldboard 144 is arranged angled relative a widthwise extension W of the scraper 140, such as by a second angle a2, as seen in a plane parallel the plane P of the flexible blade member 141. The second angle a2 may be an acute angle. That is, the first angle a1 and the second angle a2 may respectively be in the range of 0 degrees < a1, a2 < 90 degrees.

[0066] Likewise, the cutting edge 145 is arranged angled relative the longitudinal or length extension L of the scraper 140, such as by the first angle a1. The first angle a1 may be an acute angle.

[0067] The cutting edge 145 is arranged and angled relative a widthwise extension W of the scraper 140, such as by a second angle a2. The second angle a2 may be an acute angle.

[0068] Furthermore, at least a portion of the second end portion 116 tapers in the plane P of the flexible blade member 141.

[0069] The crusher 100 further comprises a dust collar 108 juxtaposed at least partially immediately below the at least one rotatable mantle 104, 105. The scraper 140 is adapted to extend between the at least one rotatable mantle and the dust collar 108.

[0070] The dust collar 108 tapers in an axial direction A of the crusher 100, such as an axially A upwards direction. The second end portion 116 tapers with a third angle a3 such as to substantially align with an upper surface of the dust collar 108. The third angle a3 may correspond to the second angle a2.

[0071] In the embodiment show, the scraper 140 comprises a plurality of ploughing members 142, in particular two. By the provision of a plurality of ploughing members 142, improved scraping efficiency may be facilitated. For example, a respective ploughing member of the plurality of ploughing members may displace a respective layer of earth material of a plurality of layers of earth material.

[0072] A respective ploughboards 144 of the at least one ploughing member 142 may be one of straight or curved, such as convex or concave, such as straight as shown in FIG. 3b, for example as seen in the plane P of the flexible blade member 141. In the embodiment shown in FIG. 3b, the respective ploughboards 144 are straight.

[0073] A respective ploughing member 142 may extend along at least 50 % of a width W of the second end portion 116, preferably at least 70 %, more preferably at least 80 %.

[0074] The ploughing member 142 may comprise a material different to the material of the flexible blade member 141.

[0075] The flexible member 141 and the ploughing members 142 may be manufactured separately and joined together by bonding agents (ex. glue) or molded as a single unit by either injection- or compression molding technology.

[0076] The ploughing member 142 may comprise, such as be made of, one or more of rubber, fabric reinforced rubber, polyurethane, ceramics or metallic materials.

[0077] The scraper 140 or in particular the flexible blade member 141, can be made of any polymeric material, such as rubber, fabric reinforced rubber, polyurethane or similar.

[0078] A stiffness of the flexible blade member 141 is at least Shore A 60°, such as Shore A 70°. Thereby, the scraper blade cleaning capability may be improved. The stiffness can be increased by changing rubber material from typical Shore A 60° to Shore A 70°, and / or by increasing the number of reinforcing fabric layers within the rubber.

[0079] A thickness T of the flexible blade member 141 (excluding the plough member) may be in the range of 5 to 25 millimeter.

[0080] A cross section of the plough members 142 can be square, rectangular, slotted, circular, elliptical or polygonal.

[0081] A thickness of the plough member 142 may be in the range of 5 to 25 millimeter.

[0082] Whilst FIG. 7 shows a relaxed position of the scraper, FIG. 6 cross view a flexed position of the scraper 140 wherein the ploughing member 142 engages with earth material 130. The ploughing member 142 is urged into the earth material 130 under the action of force F. Curtesy of an area of a lower surface 147 of the plough member 142 being smaller than the area of the forward face 118 at the second end portion 116, the resulting force per area unit is reduced as compared with the known scraper 140', whereby penetration of the scraper 140 into the agglomerated earth material 130 is facilitated.

[0083] The earth material 130 may for example collect on the dust collar 108 or the crusher, as illustrated. Thus, the scraper 140 is configured to obtain a flexed position in response to a movement of the first end portion 116 in the rotation direction S and engagement of second end portion 116 with the earth material 130.

[0084] As derivable from FIG. 6 in conjunction with FIG. 4 and FIG. 7, a portion of the forward face 118 at the second end portion 116 faces in an axially A downwards direction of the rotatable shaft 110 the flexed position.

[0085] FIG. 8 shows an embodiment wherein a height of the plough members 140, corresponding to the thickness T direction of the flexible blade member 141, varies along the width direction W of the flexible blade member 141. This configuration may facilitate improved penetration function.

[0086] FIG. 9 shows an embodiment wherein a respective extension of the ploughing member 142 along the width direction W of the scraper 140 is discontinuous. This configuration may facilitate improved ploughing function.

[0087] FIG. 10 shows an embodiment wherein the mouldboard 144 and the cutting edge 145 comprises a concave shape, as seen in the plane P.

[0088] FIG. 11 shows an embodiment wherein the mouldboard 144 and the cutting edge 145 comprises a convex shape, as seen in the plane P

Claims

1. A scraper (140) for a crusher (100), comprising a flexible blade member (141) having a first end portion (114) configured for operative coupling with a rotatable shaft (110) of the crusher (100), and a forward face (118) adapted to face in a rotation direction (S) of the shaft (110), and a second end portion (116) provided with at least one ploughing member (142) projecting from the forward face (118).

2. The scraper (140) according to claim 1, wherein the at least one ploughing member (142) is adapted to displace earth material (130) in a direction transverse (Tv) the rotation direction (S) in response to rotation of the shaft (110).

3. The scraper (140) according to claim 1 or 2, wherein the scraper (140) is configured to obtain a flexed position in response to a movement of the first end portion (116) in the rotation direction (S) and an oppositely directed force acting on the second end portion (116).

4. The scraper (140) according to any one of the preceding claims 1 to 3, wherein the rotatable shaft (110) is operatively coupled to at least one rotatable mantle (104, 105) of the crusher (100), and optionally to a retaining ring (106) for retaining one or more of the at least one rotatable mantle (104, 105), and wherein the first end portion is (114) configured to be operatively coupled to one or more of the at least one mantle (104, 105) and the retaining ring (106).

5. The scraper (140) according to any one of the preceding claims 1 to 4, wherein the ploughing member (142) comprises a mouldboard (144), wherein at least a portion of the mouldboard (144) is arranged with a first angle (a1), relative the longitudinal extension (L) of the scraper (140), preferably the first angle (a1) is an acute angle.

6. The scraper (140) according to any one of the preceding claims 1 to 5, wherein at least a portion of the mouldboard (144) is arranged with a second angle (a2), relative the width-wise extension (W) of the scraper (140), preferably the second angle (a2) is an acute angle.

7. The scraper (140) according to any one of the preceding claims 1 to 6, wherein at least a portion of the second end portion (116) tapers in the plane (P) of the flexible blade member (141).

8. The scraper (140) according to any one of the preceding claims 1 to 7, wherein the crusher (100) further comprises a dust collar (108) juxtaposed at least partially immediately below one or more of the at least one rotatable mantle (104, 105) and the retaining ring (106), and wherein the scraper (140) is adapted to extend between the at least one rotatable mantle (104, 105) and / or the retaining ring (106) and the dust collar (108).

9. The scraper (140) according to any one of the preceding claims 1 to 8, wherein the scraper (140) is configured to be fixedly attached to the retaining ring (106).

10. The scraper (140) according to any one of the preceding claims 1 to 8, comprising a plurality of ploughing members (142), such as at least two.

11. The scraper (140) according to any one of the preceding claims 5 to 10, wherein a respective mouldboard (144) of the at least one ploughing member (142) is one of substantially straight or curved, such as convex or concave.

12. The scraper (140) according to any one of the preceding claims 1 to 3, wherein the ploughing member (142) comprises one or more of rubber, fabric reinforced rubber, polyurethane, ceramics or metallic materials.

13. The scraper (140) according to any one of the preceding claims 1 to 3, wherein the flexible blade member (141) comprises a polymeric material, such as rubber, fabric reinforced rubber, polyurethane or similar.

14. The scraper (140) according to any one of the preceding claims 1 to 3, wherein a stiffness of the flexible blade member (141) is in the range of Shore A 40° to Shore A 90°.

15. A crusher (100), such as a cone crusher, comprising at least one scraper (140) according to any one of the preceding claims 1 to 14, preferably the scraper (140) is fixedly attached to one or more of the at least one mantle (104, 105) and the retaining ring (106)

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