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BR-112024026906-B1 - A jaw assembly of a jaw crusher.

BR112024026906B1BR 112024026906 B1BR112024026906 B1BR 112024026906B1BR-112024026906-B1

Abstract

A JAW ASSEMBLY OF A JAW CRUSHER. The present invention relates to a jaw assembly of a jaw crusher (1), comprising a jaw liner (18) having a front working face (20), a rear face (21), a top (22) and a bottom (23), a frame (16) forming part of a jaw (2, 3), the frame having a support face which in use confines the rear face (21) of the jaw liner (18), a first retaining plate (25a, 25b) for locking the top of the jaw liner to the support face, the first retaining plate having a base (50) which in use confines the top of the jaw liner, and a retainer assembly for limiting lateral movement of the jaw liner (18) relative to the frame (16). The retainer assembly comprises a first recess (40) in an upper part of the rear face (21) of the jaw liner (18), a second recess (51a, 51b) disposed in the base (50) of the first retainer plate (25a, 25b), and a removable retainer pad (60) extending through the top (22) of the jaw liner (18). The retainer pad comprises a head part (62) that is accommodated within the second recess (51a, 51b) and an anchor part that is accommodated (...).

Inventors

  • Stuart SMYTH
  • STUART GRAYDON
  • Adam Baxter

Assignees

  • SANDVIK LTD

Dates

Publication Date
20260317
Application Date
20230619
Priority Date
20220621

Claims (13)

  1. 1. Jaw assembly of a jaw crusher (1), comprising: a jaw liner (18) having a front working face (20), a rear face (21), a top (22) and a bottom (23); a frame (16) forming part of a jaw (2, 3), the frame having a support face which in use confines the rear face (21) of the jaw liner (18); a first retaining plate (25a, 25b) for locking the top of the jaw liner to the support face, the first retaining plate having a base (50) which in use confines the top of the jaw liner; and a retainer assembly for limiting lateral movement of the jaw liner (18) relative to the frame (16); the retainer assembly comprising: a first recess (40) in an upper part of the rear face (21) of the jaw liner (18); a second recess (51a, 51b); and: a removable retainer pad (60) extending through the top (22) of the jaw liner (18) and comprising a head part (62) and an anchor part, characterized in that the second recess (51a, 51b) is disposed in the base (50) of the first retainer plate (25a, 25b), and in that the head part (62) is accommodated within the second recess (51a, 51b) and in that the anchor part is accommodated within the first recess (40).
  2. 2. Jaw assembly according to claim 1, characterized in that the head part (62) of the retainer pad (60) comprises a lifting eye (65).
  3. 3. Jaw assembly according to claim 1 or 2, characterized in that the retainer pad (60) is frangible.
  4. 4. Jaw assembly according to claim 3, characterized in that the retainer pad (60) comprises a screw (61) having a first end comprising the head part (62) and a second part that is threaded (63), and a corresponding threaded nut (64).
  5. 5. Jaw assembly according to any of the preceding claims, characterized in that it comprises a first retainer assembly disposed towards each side of the jaw liner and a second retainer disposed towards a center of the jaw liner, wherein the tolerance defined between the second recess (51a) and the head part (62) of the second retainer is greater than the tolerance defined between the second recess (51b) and the head part (62) of the first retainer.
  6. 6. Jaw assembly according to claim 5, characterized in that it includes two first retainer assemblies and two second retainer assemblies arranged on a top of the jaw assembly.
  7. 7. Jaw assembly according to any of the preceding claims, characterized in that the first recess (40) extends through the back face (21) of the jaw liner (18) to define an inwardly projecting flange (41) at the top of the jaw liner.
  8. 8. Jaw assembly according to any of the preceding claims, characterized in that the one or each second recess (51a, 51b) is formed from a recess in the base (50) and a rear (52) of the retaining wedge plate (25a, 25b).
  9. 9. Jaw assembly according to any of the preceding claims, characterized in that it further includes: a second retaining plate (26) for locking the bottom (23) of the jaw liner to the supporting face, the second retaining plate having a top which in use confines the bottom of the jaw liner; a first recess (70) in a lower part of the back face of the jaw liner; and a removable retainer pad (60) extending through the bottom of the jaw liner and comprising an anchor part which is accommodated within the first recess (70) and a head part (62) which engages with a side (71) of the second retaining plate.
  10. 10. Jaw assembly according to any of the preceding claims, characterized in that the first retaining plate (25a, 25b) is a retaining wedge plate.
  11. 11. Jaw assembly according to any of the preceding claims, characterized in that the second recess (51a, 51b) is disposed on the base (50) and on the rear (52) of the first retaining plate (25a, 25b).
  12. 12. Jaw (2, 3) of a jaw crusher (3), characterized in that it comprises a jaw assembly as defined in any one of claims 1 to 11.
  13. 13. Jaw crusher (1), characterized in that it comprises a stationary jaw (2) and a moving jaw (3), wherein one of the stationary jaw and the moving jaw comprises a jaw assembly as defined in any one of claims 1 to 11.

Description

Technical Field of the Invention [0001] The present invention relates to a jaw assembly of a jaw crusher. The present invention also relates to a jaw crusher comprising a jaw assembly. Technical Overview of the Invention [0002] Jaw crusher units typically comprise a fixed jaw and a movable jaw which together define a crushing zone. A drive mechanism is operative to agitate the movable jaw back and forth in such a way as to crush material within this zone. The crushing zone is generally convergent towards its lower discharge end in such a way that crushable material fed to a higher and wider end of the zone has the ability to fall (drop) downwards (descend) under the action of gravity while being subjected to repeated cycles of crushing motion in response to the cyclical movement of the movable jaw. The crushed material is then discharged under the action of gravity through the lower discharge end onto a conveyor belt for further processing or to a suitable stockpile. [0003] Due to the forces exerted on the jaws, jaw liners wear out over time and are required to be replaced. Current jaw liners have holes on the working surface for receiving lifting hooks when the jaw liners are to be replaced. These holes add cost and complexity to the casting (molding) process of the jaw liners and also reduce the efficiency of the milling operation. [0004] Current jaw liners also incorporate retention assemblies that are intended to limit lateral movement of the jaw liner relative to the jaw (structure). The retention assembly comprises internally cast (molded) plugs that interface with the back face of the jaw liners. The lateral retention plugs can and do shear if a large crushing force is experienced, and repair of the casting is costly and time-consuming. [0005] It is an objective of the present invention to overcome at least one of the problems mentioned above. Summary of the Invention [0006] The objective of the present invention is achieved by providing a jaw assembly for a jaw crusher comprising a side retainer pad that couples the top of the jaw liner with a lower side (bottom part) of a retaining plate, such as a retainer wedge plate. The pad has a head portion that is accommodated in a recess in the base of the retaining plate and an anchor portion that is accommodated in a recess in a rear of the jaw liner. The recesses are not exposed at the front of the jaw liner and, consequently, provide protection for the pad. The retainer pad is also frangible in such a way that when the jaw assembly encounters heavy loads, it breaks, enabling the jaw liner to move and preventing structural damage to the fixed jaw. Additionally, since the head portion of the retainer pad is exposed above the top of the jaw liner (see Figures 5 and 6), it can function as a lifting latch when the jaw liner needs to be replaced or rotated. [0007] In a first aspect, the present invention provides a jaw assembly for a jaw crusher, comprising: a jaw liner having a front working face, a rear face, a top and a bottom; a frame forming part of a jaw, the frame having a support face which in use confines the rear face of the jaw liner; a first retaining plate for locking the top of the jaw liner to the support face, the first retaining plate having a base which in use confines the top of the jaw liner; and: a retainer assembly for limiting lateral movement of the jaw liner relative to the frame. [0008] In any embodiment, the retainer assembly comprises: a first recess in an upper part of the rear face of the jaw liner; a second recess disposed at the base of the first retainer plate; and: a removable retainer pad extending through the top of the jaw liner and comprising a head portion that is accommodated within the second recess and an anchor portion that is accommodated within the first recess. [0009] In any embodiment, the head portion of the retainer pad comprises a lifting eye. [0010] In any embodiment, the retainer pad is frangible. [0011] In any embodiment, the retainer pad comprises a screw having a first end comprising the head part and a second part that is threaded, and a corresponding threaded nut. [0012] In any embodiment, the jaw assembly comprises a first retainer assembly arranged toward each side of the jaw liner and one (or more) second retainer assemblies arranged toward a center of the jaw liner. [0013] In any embodiment, a defined tolerance between the second recess and the head portion of the second retainer is greater than a defined tolerance between the second recess and the head portion of the first retainer. [0014] In any embodiment, the jaw assembly comprises two first retainer assemblies and two second retainer assemblies arranged on one top of the jaw assembly. [0015] In any embodiment, the first recess extends through part or all of the jaw liner to define an inward projecting flange at the top of the jaw liner. [0016] In any embodiment, the or each second recess is formed at the base and a rear of the retaining wedge p