Hydraulic system for jaw crusher

Abstract

In one aspect, there is provided a jaw crusher (20) comprising: a motor providing a primary power source to a primary hydraulic pump of the jaw crusher (20); a crusher frame (50) supporting a fixed jaw (30) and a movable jaw (40), the fixed jaw (30) and the movable jaw (40) defining a crushing chamber (60); a cross beam mounted transversely in the crusher frame (50); a toggle plate extending between the cross beam and the movable jaw (40); a hydraulic system having a main pump line (221) powered by said main hydraulic pump for moving said movable jaw (40) and gripping said toggle plate wherein said hydraulic system comprises an auxiliary pump (230) powered independently of said main pump for effecting the movement of the jaw (40).

Description

Technical Field

[0001] Various aspects of the invention relate to a hydraulic system configured to operate a jaw crusher independently of a primary power source. The invention also relates to a method of repairing or maintaining a jaw crusher. In a further aspect, the invention relates to a jaw crusher repair tool for supporting an item such as a toggle plate during repair of the jaw crusher. Background Art

[0002] A variety of different crushers have been developed for processing bulk materials such as stone, minerals and domestic and industrial waste including construction materials to produce a crushed product for subsequent processing or disposal.

[0003] A jaw crusher generally consists of a fixed jaw and a movable jaw mounted in a crusher frame, wherein the movable jaw is movable relative to the fixed jaw to generate a thrust to crush the material in a crushing chamber defined between the two jaws. The jaw crusher comprises a crossbeam in the crusher frame and a toggle plate clamped between the crossbeam and the movable jaw. A hydraulic system applies a load to the crossbeam, which is transferred to the movable jaw via the toggle plate to resist the forces generated during crushing. The jaw crusher can be a mobile or a fixed crusher, wherein a mobile crusher is provided with a wheeled or tracked chassis, and a fixed crusher is provided with a fixed crusher main frame.

[0004] Jaw crushers require regular maintenance and repair, and due to the forces to which they are subjected during use, parts of the jaw crusher sometimes need to be assembled, disassembled, replaced or removed for repair, for example a worn (typically after 3,000 to 4,000 hours of use) or damaged toggle plates may need to be removed and replaced. Due to the construction of the jaw crusher, these items must usually be removed and replaced manually from underneath. However, toggle plates and other jaw crusher parts can be very heavy and cumbersome (e.g., a toggle plate typically has a weight of about 100 kg), with the result that manual handling of the items can present significant health and safety risks to maintenance personnel.

[0005] Known jaw crushers are also equipped with a hydraulic system powered by the jaw crusher motor to achieve movement of the movable jaw and clamp the toggle plate between the movable jaw and the crossbar. Therefore, in order to make the toggle plate available for removal, the jaw crusher motor is activated to lock open the movable jaw and then turned off to allow manual access to the toggle plate. However, once the motor is turned off, the hydraulic fluid returns through the hydraulic system under the action of gravity, causing the movable jaw to close. This may also pose a safety hazard to maintenance personnel and reduce the time available to achieve removal of the toggle plate.

[0006] An object of the present invention is to provide a jaw crusher service tool to aid in servicing a jaw crusher so as to minimise health and safety risks.Another object of the present invention is to provide a hydraulic system for a jaw crusher configured to achieve movement of a movable jaw independently of the jaw crusher motor. Summary of the invention

[0007] In one aspect of the invention, there is provided a jaw crusher service tool for supporting an article during service of a jaw crusher, the jaw crusher comprising a fixed jaw and a movable jaw mounted in 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 mounting seat, which is attached to the support frame, the jaw crusher mounting seat being used to mount the service tool on the jaw crusher, Therein, the support frame is movable about the first articulation axis and / or the second articulation axis between a transport position and an article support position on the jaw crusher.Therefore, the jaw crusher tool allows for safe handling and manipulation of heavy components such as toggle plates during service and maintenance operations.

[0008] Suitably, the support frame includes a tool storage compartment for storing items in the transport and storage positions. Thus, the support frame can provide dual functionality - supporting and storing various items as required.

[0009] In one embodiment, the first articulation axis comprises a horizontal pivot axis. Thus, the support frame can be pivoted and positioned as required, for example by 90° about the horizontal axis.

[0010] In any embodiment, the second articulation axis comprises a vertical pivot axis. Thus, the support frame can be pivoted and positioned as desired, for example pivoting 180° about the vertical axis.

[0011] In one embodiment, the mounting seat defines the horizontal pivot axis and the vertical pivot axis.Thus, the mounting seat has a dual function and ensures that the jaw crusher service tool is compact and space-saving.

[0012] Suitably, the support frame comprises a platform, the platform defining a support surface for the article.

[0013] In one embodiment, the support frame comprises an item grip or grips the item. Thus, the item is securely supported on the platform.

[0014] Optionally, the jaw crusher mounting is a detachable jaw crusher mounting, so that the jaw crusher service tool can be removed and repositioned on the jaw crusher as required.

[0015] Suitably, the jaw crusher mounting base is configured to be mountable on a crusher chassis or a crusher frame.Therefore, the jaw crusher service tool can be located at various positions on the jaw crusher.

[0016] The present invention also relates to a jaw crusher comprising the jaw crusher maintenance tool as described above.

[0017] In any embodiment, the jaw crusher comprises: A motor providing a main power source to a main hydraulic pump of the jaw crusher; a crusher frame supporting a fixed jaw and a movable jaw defining a crushing chamber; a crossbeam mounted transversely in the crusher frame; a toggle plate extending between the crossbeam and the movable jaw, a hydraulic system having a main pump line powered by the main hydraulic pump for moving the movable jaw and clamping the toggle plate, and an auxiliary main pump line, which is powered by the main hydraulic pump for moving the movable jaw and releasing the toggle plate, Wherein, the hydraulic system comprises an auxiliary pump, and this auxiliary pump is powered independently of the main pump, for realizing the movement of this movable jaw.Therefore, this movable jaw can be powered to open, and keep open as required, without the operation of the motor, so as to improve safety during maintenance operation.

[0018] Suitably, the auxiliary pump comprises a battery powered auxiliary pump.Thus, the auxiliary pump does not require power via a motor.

[0019] In any embodiment, the battery powered auxiliary pump is a 24V service pump.

[0020] In one embodiment, the auxiliary pump is located in an accumulator frame on the crusher frame. This ensures a faster response time for shock attenuation and a reduction in water hammer effects.

[0021] Suitably, the accumulator frame includes a shut-off valve to isolate the hydraulic system from the auxiliary pump as required. This prevents fluid from returning to the tank during operation of the auxiliary pump.

[0022] In one aspect of the present invention, there is provided a jaw crusher, comprising: A motor providing a main power source to a main hydraulic pump of the jaw crusher; a crusher frame supporting a fixed jaw and a movable jaw defining a crushing chamber; a crossbeam mounted transversely in the crusher frame; a toggle plate extending between the cross beam and the movable jaw, and a hydraulic system having a main pump line powered by a main hydraulic pump for moving the movable jaw and clamping the toggle plate; Wherein, the hydraulic system comprises an auxiliary pump, and this auxiliary pump is powered independently of the main pump, for realizing the movement of this movable jaw.Therefore, the movable jaw can be powered to open, and to remain open as required, without the operation of the motor, to improve safety during maintenance operations.

[0023] In any embodiment, the crusher further comprises an auxiliary main pump line powered by a main hydraulic pump for moving the movable jaw and releasing the toggle plate.

[0024] Suitably, the auxiliary pump comprises a battery powered auxiliary pump.Therefore, the auxiliary pump does not require power via a motor.

[0025] In any embodiment, the battery powered auxiliary pump is a 24V service pump.

[0026] In one embodiment, the auxiliary pump is located in an accumulator frame on the crusher frame. This ensures a faster response time for shock attenuation and a reduction in water hammer effects.

[0027] Suitably, the accumulator frame includes a shut-off valve to isolate the hydraulic system from the auxiliary pump as required. This prevents fluid from returning to the tank during operation of the auxiliary pump.

[0028] In another embodiment, the present invention is directed to a method of repairing or maintaining a jaw crusher having: a motor providing a primary power source to a main hydraulic pump of the jaw crusher; a crusher frame supporting a fixed jaw and a movable jaw defining a crushing chamber; a crossbeam mounted transversely in the crusher frame; a toggle plate extending between the crossbeam and the movable jaw; and a hydraulic system having a main pump line powered by a main hydraulic pump for moving the movable jaw and clamping the toggle plate, wherein the method includes securing the movable jaw of the jaw crusher in an open position using a turnbuckle secured to the crusher frame. This allows safe repair, installation, and removal of other jaw crusher components during repair / removal of the toggle plate.

[0029] In one embodiment, the method further comprises the step of moving the movable jaw to the open position using an auxiliary pump, the auxiliary pump being powered independently of the main pump.Therefore, operation of a motor is not required, thereby increasing safety during maintenance operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0031] Figure 1 is a side view of a jaw crusher with the jaw crusher service tool of the present invention installed on the chassis of the jaw crusher, wherein the jaw crusher service tool is in a transport and storage position;

[0032] Figure 2 is from Figure 1 An enlarged isometric view of the fixed and movable jaws of a jaw crusher and the crushing chamber as seen from above;

[0033] Figure 3 is an enlarged isometric view of the jaw crusher from the outside of the jaw crusher with the jaw crusher service tool on the chassis of the jaw crusher;

[0034] Figure 4 yes Figure 3 An enlarged isometric view of a jaw crusher service tool as seen from the inside of the jaw crusher chassis with the jaw crusher service tool item / tool ​​storage compartment visible;

[0035] Figure 5 It is separated from the chassis for clarity. Figure 3 A magnified isometric view of jaw crusher maintenance tools;

[0036] Figure 6 It is in the position of supporting objects Figure 5 Isometric view of jaw crusher maintenance tools;

[0037] Figure 7 yes Figure 6 An exploded isometric view of jaw crusher maintenance tools;

[0038] Figure 8 The first joint motion axis and the second joint motion axis are rotated to the object support position. Figure 3 Isometric view of jaw crusher maintenance tools;

[0039] Fig. 9 is from Figure 8 An isometric view of a support frame of a jaw crusher service tool as seen from the inside of the chassis, the support frame rotated through 180° about a vertical pivot axis to a working position below the jaw crusher and within the chassis interior;

[0040] Fig.10 yes Figures 1 to 9 An enlarged view of the accumulator frame with the auxiliary pump of the hydraulic system of the jaw crusher, and

[0041] Fig.11 is a side cross-sectional view of a jaw crusher with the jaw crusher in the object support position Figures 1 to 9 Jaw crusher maintenance tools and Fig.10 The accumulator frame of the jaw crusher, and in this jaw crusher, the movable jaw is powered by an auxiliary pump to open, and the movable jaw is firmly held in the open position by an optional turnbuckle. DETAILED DESCRIPTION

[0042] Figure 1 The jaw crusher maintenance tool 10 of the present invention is shown mounted on a mobile jaw crusher 420, and Figure 2 An enlarged view of the operation of the jaw crusher 20 of a mobile jaw crusher 420 is shown. As shown, the jaw crusher 20 is mounted on a mobile jaw crusher 420 provided with a chassis 170 on which a fixed jaw 30 and a movable jaw 40 are mounted, which are located in a crusher frame 50 and define a crushing chamber 60 for the material to be crushed. In this embodiment, the jaw crusher tool 10 is mounted on the chassis 170. However, in other embodiments, the jaw crusher service tool 10 can be mounted elsewhere on the crusher frame 50. Each jaw 30, 40 is provided with a wear plate 31, 41, respectively. The upper end of the movable jaw 40 is connected to an eccentric shaft 42 rotatably accommodated in a bearing 43, so that the rotation of the eccentric shaft 42 causes the upper end of the movable jaw 40 to move circumferentially toward the fixed jaw 30, thereby generating a driving force for crushing the material in the crushing chamber 60. The inertia required to crush the material fed to the jaw crusher 20 is provided by a counterweight flywheel 21 which is operable to move an eccentric jaw crusher shaft 42 on which the movable jaw 40 is mounted. The jaw crusher motor operates to rotate the flywheel 21 via a drive belt. As will be appreciated by those skilled in the art, the jaw crusher 20 typically includes a crossbeam and a toggle plate disposed at the lower end of the movable jaw 40. The toggle plate is an extremely heavy item that requires periodic maintenance or replacement. The jaw crusher 1 further includes a hydraulic system 210 (see Fig.10 and Fig.11), for moving and positioning the movable jaw 40 to a desired position, such as to a desired closed side setting (CSS) (the shortest distance between the wear plate 31 of the fixed jaw 30 and the wear plate 41 of the movable jaw 40) or another position. As will be explained more fully below, the storable and articulatable jaw crusher service tool 10 of the present invention on a mobile jaw crusher 420 facilitates safe servicing of the jaw crusher 20 from below by providing readily accessible and usable on-demand support for heavy and cumbersome items such as toggle plates during service operations, while the hydraulic system 210 ensures that the movable jaw 40 can be powered to open and powered to close independently of the jaw crusher motor to allow safe and controlled access to the toggle plate. The jaw crusher service tool 10 can also be used as a storage device for other tools.

[0043] Figure 3 and Figure 4 The chassis 170 is shown Figure 1 170 , and a jaw crusher service tool 10 is a jaw crusher service tool 10 having a plurality of jaw crushers. The ... Figure 6 .

[0044] For the sake of clarity, Figure 5 The chassis 170 is shown separated from the chassis 170 and in the transport position. Figure 3 The jaw crusher service tool 10 of FIG. As shown, the platform 140 and the jaw crusher mount 80 of the jaw crusher service tool 10 are joined from the platform 140 to the crusher mount 80 at the arm 130. The platform 140 is substantially rectangular in shape and has an upper flat support surface 141 defining a tool storage chamber 143 and a contoured rear surface 142 (see also FIG. Figure 4 ). Thus, in the transport position the jaw crusher tool 10 can also be used as a storage container for operable tools or the like, in particular when the jaw crusher 20 is not in operation and not undergoing maintenance operations, so that the shown transport position can also be an effective storage position, i.e. a transport and storage position, if desired.

[0045] The upper flat surface 141 is provided with an upstanding gripping portion 150 at its proximal end and an oppositely disposed L-shaped removable gripping plate 151 at its distal end for gripping an item such as a toggle plate between the gripping portion 150 and the gripping plate 151 (see also Figure 6 ). The removable gripping plate 151 may be held in place by bolts 152. Figure 5 As shown, the crusher mount 80 is configured to define a first articulation axis 90 and a second articulation axis 100 so that the platform 140 can be moved between a transport position and an item support position on the chassis 170. In this embodiment, the first articulation axis 90 is a horizontal pivot axis 110 and the second articulation axis 100 is a vertical pivot axis 120.

[0046] The horizontal pivot axis 110 is defined by a rotatable elongated horizontal tubular member 111 bordering the arm 130 and attached to the arm 130 via a bolt 131, while the vertical pivot axis 120 is defined by a vertically disposed pin 121 extending through a pin opening 122 defined at the proximal end of the tubular member 111. The pin 121 is rotatably supported in a bracket 123 disposed below the tubular member 111, which bracket also forms a part of the mounting seat 80.

[0047] The platform 140 can be rotated about the horizontal pivot axis 110 from Figure 5 The transport position shown is rotated to Figure 6 and Figure 7 As shown in the drawings, in the article support position, the upper flat surface 141 of the platform 140 is oriented upward to receive an article to be supported by the jaw crusher tool 10, such as a toggle plate, which can be held in place between the grip 150 and the grip plate 151 if desired, and the contoured rear surface 142 is oriented downward.

[0048] Thus, the jaw repair tool 10 is capable of pivoting from one direction to the other about the horizontal pivot axis 110 and the vertical pivot axis 120. Figure 3 and Figure 4 The transport position of the jaw chassis 170 is shown moved to Figure 8 Item support locations shown.

[0049] If desired, the platform 140 can be rotated 180° about the vertical pivot axis 120 to protrude into the chassis 170 below the fixed jaw 30 and the movable jaw 40 to provide support for the item as needed. For example, in the case where the toggle plate 180 is to be located below the movable jaw 40 for installation, the toggle plate 180 can be placed on the platform 140, such as Figure 8As shown, the platform can then be rotated about the vertical pivot axis 120 to position the toggle plate 180 adjacent the movable jaw 40, as shown. Fig. 9 Thus, removal and replacement of the toggle plate 180 may be performed in a safer manner than has heretofore been possible.

[0050] Fig.10 An accumulator frame 210 of a hydraulic system of a jaw crusher 20 is shown in which the accumulator frame 210 is provided with an auxiliary pump 230 which is powered independently of the hydraulic system main pump for enabling movement of the movable jaw 40 during maintenance operations so that maintenance operations can be performed without activating the jaw crusher motor required to power the hydraulic system main pump. The auxiliary pump 230 may be a battery powered auxiliary pump such as a 24V service pump. Those skilled in the art will be familiar with conventional hydraulic systems 210 without the accumulator frame 210 / auxiliary pump 230 in which the hydraulic system main pump is in fluid communication with the main pump line 221 to enable toggle cylinder closure.

[0051] As shown, the auxiliary pump 230 is in fluid communication with the second main pump line 222, which enables opening of the toggle clamping cylinder independently of the first main pump line 221 powered by the main pump, i.e., pushing the toggle clamping cylinder piston away from the toggle plate so that the toggle plate is released and can "fall out". Therefore, unlike the known operation of the movable jaw 40 in the known jaw crusher, the toggle plate can be removed and the movable jaw 40 can be powered to open. As shown, the accumulator frame 210 is also provided with an accumulator pressure transducer 360 and a toggle cylinder pressure transducer 370. A shut-off valve 390 is also provided in the accumulator frame 210 to isolate the hydraulic system from the auxiliary pump 230 as required and to prevent fluid from returning to the tank during operation of the auxiliary pump 230. Once the maintenance operation is completed, the shut-off valve 390 is opened to allow fluid to flow during normal operation, so that after the shut-off valve 390 is opened, the toggle clamp cylinder piston closes under gravity, i.e., the captured energy is dissipated, so that the oil returns to the tank, and the pressure transducer 370 can detect whether the shut-off valve 390 is open or closed. However, when the main hydraulic pump is used, the cylinder can be powered via the hydraulic system to open and close / the toggle plate can be clamped for crushing operations. In short, with the auxiliary pump 230, the movable jaw 40 can be kept open as required, and when the motor is turned off, the movable jaw 40 is not closed due to the return of hydraulic fluid through the second main pump line 222. This results in a significant improvement in the safety of operations for performing maintenance and maintenance operations. Another optional safety enhancement is that the shut-off valve 390 can be part of a lock-out tag-out safety procedure.

[0052] Fig.11 Shown with Figures 1 to 9A similar jaw crusher 20 is provided with a jaw crusher maintenance tool 10 in an article supporting position and Fig.10 The movable jaw 40 is provided with an accumulator frame 210 (not shown). Like reference numerals denote like parts. As shown, the movable jaw 40 is powered to open by the auxiliary pump 230, as previously described. However, to further enhance personnel safety, the movable jaw 40 can be further secured in a fixed open position by an optional turnbuckle 400. The turnbuckle 400 is mounted below the toggle plate 180 and associated toggle clamping cylinder 410 and is secured at each end to the underside of the crusher frame 50 and the movable jaw 40 on either side of the toggle plate 180.

[0053] The accumulator frame 210 may be located on the crusher frame 50 to ensure faster response time for shock attenuation and reduction of water hammer effects.

Claims

1. A jaw crusher (20), comprising: A motor, the motor providing a main power source to a main 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 cross beam, the cross beam being transversely mounted within the crusher frame (50); a toggle plate extending between the cross beam and the movable jaw (40), a hydraulic system having a main pump line (221) powered by the main hydraulic pump for moving the movable jaw (40) and clamping the toggle plate, The hydraulic system comprises an auxiliary pump (230), which is powered independently of the main pump to achieve movement of the movable jaw (40).

2. The jaw crusher according to claim 1, further comprising an auxiliary main pump line (222) powered by the main hydraulic pump for moving the movable jaw (40) and loosening the toggle plate.

3. The jaw crusher (20) according to claim 1 or 2, wherein: The auxiliary pump (230) includes a battery-powered auxiliary pump (240).

4. The jaw crusher (20) according to claim 3, wherein: The battery powered auxiliary pump (240) is a 24V maintenance pump.

5. The jaw crusher (20) according to claim 3 or 4, wherein: The auxiliary pump (230) is located in an accumulator frame (210) on the crusher frame (50).

6. The jaw crusher (20) according to claim 5, wherein: The accumulator frame (210) includes a shutoff valve (390) to isolate the hydraulic system from the auxiliary pump (230) as required.

7. A method of repairing or maintaining a jaw crusher (20), the jaw crusher having a motor providing a primary power source to a main hydraulic pump of the jaw crusher; a crusher frame supporting a fixed jaw and a movable jaw, the fixed jaw and the movable jaw defining a crushing chamber; a crossbeam mounted transversely in the crusher frame; a toggle plate extending between the crossbeam and the movable jaw; and a hydraulic system having a main pump line powered by the main hydraulic pump for moving the movable jaw and clamping the toggle plate, wherein: The method includes securing the movable jaw of the jaw crusher in an open position using a turnbuckle secured to the crusher frame.

8. The method of claim 7, further comprising the step of moving the movable jaw (40) to the open position using an auxiliary pump (230) powered independently of the main pump.

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