BR-112024026850-B1 - Jaw crusher and method of servicing or maintaining a jaw crusher.

Abstract

HYDRAULIC SYSTEM FOR JAW CRUSHER. The present invention relates in one aspect to a jaw crusher (20) comprising a motor providing a primary power source for a primary hydraulic pump of the jaw crusher (20); a structure (50) supporting a fixed jaw (30) and a movable jaw (40) defining a crushing chamber (60); a crossbeam transversely mounted on the crusher structure (50); a toggle plate extending between the crossbeam and the movable jaw (40), a hydraulic system having a primary pump line (221) driven by the primary hydraulic pump for moving the movable jaw (40) and locking (fixing) the toggle plate, wherein the hydraulic system comprises an auxiliary pump (230) driven independently of the primary pump for effecting movement of the jaw (40).

Inventors

• STUART GRAYDON
• Stuart SMYTH
• Adam Baxter

Assignees

• SANDVIK LTD

Dates

Publication Date

20260317

Application Date

20230621

Priority Date

20220621

Claims (8)

1. 1. Jaw crusher (20) comprising: a motor providing a primary power source for a primary hydraulic pump of the jaw crusher (20); a crusher frame (50) supporting a fixed jaw (30) and a movable jaw (40) defining a crushing chamber (60); a crossbeam transversely mounted on the crusher frame (50); a toggle plate extending between the crossbeam and the movable jaw (40); a hydraulic system having a primary pump line (221) driven by the primary hydraulic pump for moving the movable jaw (40) and locking the toggle plate; characterized in that the hydraulic system comprises an auxiliary pump (230) driven independently of the primary pump for effecting movement of the movable jaw (40).
2. 2. Jaw crusher according to claim 1, characterized in that it further comprises a second primary pump line (222) driven by the primary hydraulic pump for moving the movable jaw (40) and unlocking the toggle plate.
3. 3. Jaw crusher (20) according to claim 1 or 2, characterized in that the auxiliary pump (230) comprises a battery-driven auxiliary pump (240).
4. 4. Jaw crusher (20) according to claim 3, characterized in that the battery-driven auxiliary pump (240) is a 24 V maintenance pump.
5. 5. Jaw crusher (20) according to claim 3 or 4, characterized in that the auxiliary pump (230) is in an accumulator block (210) on the crusher structure (50).
6. 6. Jaw crusher (20) according to claim 5, characterized in that the accumulator block (210) comprises a shut-off valve (390) for isolating the hydraulic system from the auxiliary pump (230) as required.
7. 7. A method for servicing or maintaining a jaw crusher (20), having a motor providing a primary power source for a primary hydraulic pump of the jaw crusher; a crusher frame supporting a fixed jaw and a movable jaw defining a crushing chamber; a crossbeam transversely mounted on the crusher frame; a toggle plate extending between the crossbeam and the movable jaw and a hydraulic system having a primary pump line driven by the primary hydraulic pump for moving the movable jaw and locking the toggle plate, characterized in that the method comprises fixing the movable jaw of the jaw crusher in an open position with a tensioner fixed to the crusher frame.
8. 8. Method according to claim 7, characterized in that additionally a step is taken to move the movable jaw to the open position with an auxiliary pump (230) independently of the primary pump.

Description

TECHNICAL FIELD OF THE PRESENT INVENTION [0001] Aspects of the present invention relate to a hydraulic system configured to operate a jaw crusher independently of a primary power source. The present invention also relates to a method of servicing or maintaining a jaw crusher. In further aspects, the present invention relates to a jaw crusher service tool for supporting an item, such as a toggle plate, during service of the jaw crusher. TECHNICAL OVERVIEW OF THE PRESENT INVENTION [0002] A variety of different crushers have evolved for processing bulky material, such as stone, minerals and both domestic and industrial waste, including construction materials, to generate a crushed product for subsequent processing or disposal. [0003] Jaw crushers are generally made of a fixed jaw and a movable jaw mounted in a crusher frame in which the movable jaw is movable relative to the fixed jaw to generate a thrust force to crush material in a crushing chamber defined between the two jaws. The jaw crusher includes a crossbeam (bar, beam) in the crusher frame and a toggle plate locked (tightened) between the crossbeam and the movable jaw. A hydraulic system applies a load to the crossbeam, which is transmitted to the movable jaw via the toggle plate to resist the forces generated during crushing. Jaw crushers can be mobile or stationary crushers where mobile crushers are provided with a wheeled or tracked chassis and stationary crushers are provided with a stationary crusher main chassis (frame). [0004] Jaw crushers require regular maintenance and servicing, and due to the forces to which the jaw crusher is subjected during use, jaw crusher components sometimes require assembly, disassembly, replacement, or removal for service, for example, wear (typically after 3,000 to 4,000 hours of use) or damaged toggle plates may require removal and replacement. Due to the configuration of jaw crushers, such items generally have to be manually removed and replaced from below. However, toggle plates and other jaw crusher components can be extremely heavy and bulky (for example, toggle plates typically weigh around 100 kg), with the result that manually moving the items can present significant health and safety risks to service personnel. [0005] Known jaw crushers are also equipped with hydraulic systems, driven by the jaw crusher motor, to move the moving jaw and to lock (fix) a toggle plate between the moving jaw and the crossbeam. Accordingly, in order to leave the toggle plate available for removal, the jaw crusher motor is activated to lock the moving jaw open and is then switched off to allow manual access to the toggle plate. However, once the motor is switched off, the hydraulic fluid is returned through the hydraulic system under the action of gravity, resulting in the closing of the moving jaw. This can also present a safety hazard to service personnel and reduce the time available to remove the toggle plate. [0006] One objective of the present invention is to provide a jaw crusher service tool to assist in servicing a jaw crusher to minimize health and safety risks. A further objective of the present invention is to provide a hydraulic system for a jaw crusher configured to effect movement of the movable jaw independently of the jaw crusher motor. SUMMARY OF THE PRESENT INVENTION [0007] In one aspect of the present invention, a jaw crusher service tool is provided for supporting an item during service of a jaw crusher, comprising a fixed jaw and a movable jaw mounted on a crusher frame and defining a crushing chamber for material to be crushed, the service tool comprising: a support frame for supporting the item; and: a jaw crusher assembly attached to the support frame for mounting the service tool on a jaw crusher; wherein the support frame is movable around first and/or second geometric axes of articulation between a transport position and an item supporting position on the jaw crusher. The jaw crusher tool consequently enables movement and handling of heavy components, such as toggle plates, during service and maintenance operations. [0008] Appropriately, the support structure comprises a tool storage chamber for storing items in a convenient transport and storage position. The support structure can therefore serve a dual function as required – support and storage of various items. [0009] In one embodiment, the first geometric axis of articulation comprises a horizontal geometric axis of articulation. The supporting structure can therefore be articulated and positioned as required, for example, through 90° around the horizontal geometric axis. [0010] In any embodiment, the second geometric axis of articulation comprises a vertical geometric axis of articulation. The supporting structure can therefore be articulated and positioned as required, for example, through 180° around the vertical geometric axis. [0011] In one embodiment, the assembly defines the horizontal geometric axis of articulation and the vertical geometr