AU2013339535B2

AU2013339535B2 - Roller crusher

Info

Publication number: AU2013339535B2
Application number: AU2013339535A
Authority: AU
Inventors: Detlef Papajewski; Peter Schatz; Piotr SZCZELINA
Original assignee: FLSmidth AS
Current assignee: FLSmidth AS
Priority date: 2012-10-29
Filing date: 2013-10-28
Publication date: 2018-03-15
Anticipated expiration: 2033-10-28
Also published as: WO2014067882A2; EP2911797B1; BR112015009411A2; CN104903001A; DE102012110336A1; WO2014067882A3; BR112015009411B1; CN104903001B; PE20151303A1; DK2911797T3; CL2015001073A1; AU2013339535A1; EP2911797A2

Abstract

The invention relates to a roller crusher comprising a housing frame (1), a rotatable roller (2), an oscillating arm (4) mounted on an oscillating arm axis (3) on a housing frame (1), a crusher chamber (5) between the roller (2) and the oscillating arm (4), and an adjustment device (6) which is arranged at a distance to the oscillating arm axis (3) between said oscillating arm (4) and an abutment (7) which is stationary with respect to the housing frame (1), in order to enable said oscillating arm (4) to rotate about the oscillating arm axis (3). According to the invention, the adjusting device (6) comprises a wedge (8) which is arranged between the oscillating arm (4) and the abutment (7), said wedge bridging a gap between a bearing surface (9) arranged on a rear side of oscillating arm and a counter surface (10) associated with the abutment (7). The distance between the oscillating arm (4) and the roller (2) is, in the second position (P2) of the wedge (8) in the gap, greater than in a first position (P1) of the wedge in the gap.

Description

The invention relates to a roller crusher comprising a housing frame (1), a rotatable roller (2), an oscillating arm (4) mounted on an oscillating arm axis (3) on a housing frame (1), a crusher chamber (5) between the roller (2) and the oscillating arm (4), and an adjustment device (6) which is arranged at a distance to the oscillating arm axis (3) between said oscillating arm (4) and an abutment (7) which is stationary with respect to the housing frame (1), in order to enable said oscillating arm (4) to rotate about the oscillating arm axis (3). According to the invention, the adjusting device (6) comprises a wedge (8) which is arranged between the oscillating arm (4) and the abutment (7), said wedge bridging a gap between a bearing surface (9) arranged on a rear side of oscillating arm and a counter surface (10) associated with the abutment (7). The distance between the oscillating arm (4) and the roller (2) is, in the second position (P2) of the wedge (8) in the gap, greater than in a first position (Pl) of the wedge in the gap.

(57) Zusammenfassung:

[Fortsetzung auf der nachsten Seite] wo 2014/067882 A3 lllllllllllllllllllllllllllllllllllll^ — vor Ablauf der fiir Anderungen der Anspriiche geltenden

Frist; Veroffentlichung wird wiederholt, falls Anderungen eingehen (Regel 48 Absatz 2 Buchstabe h) (88) Veroffentlichungsdatum des internationalen Recherchenberichts:

12. September 2014

Die Erfindung betrifft einen Walzenbrecher mit einem Gehauserahmen (1), einer drehbaren Walze (2), einer an einer Schwingenachse (3) an dem Gehauserahmen (1) gelagerten Schwinge (4), einem Brechraum (5) zwischen der Walze (2) und Schwinge (4) und mit einer Verstelleinrichtung (6), die in einem Abstand zu der Schwingenachse (3) zwischen der Schwinge (4) und einem mit dem Gehauserahmen (1) ortsfesten Widerlager (7) angeordnet ist, um eine Drehung der Schwinge (4) um die Schwingenachse (3) zu ermoglichen. ErfmdungsgemaB weist die Verstelleinrichtung (6) einen zwischen der Schwinge (4) und dem Widerlager (7) angeordneten Keil (8) auf, der einen Spalt zwischen einer an einer Schwingenriickseite angeordneten Anlageflache (9) und einer dem Widerlage (7) zugeordneten Gegenflache (10) uberbriickt, wobei in einer zweiten Position (P2) des Keils (8) in dem Spalt der zwischen der Schwinge (4) und der Walze (2) gebildete Abstand grofier ist als in einer ersten Position (Pl).

2013339535 28 Feb 2018

Roller crusher

Description of the Invention [0001] The present invention relates to a roller crusher comprising a housing frame, a rotatable roller, a swing arm mounted on a swing arm axis on the housing, a crushing chamber between the roller and the swing arm, and an adjusting device, which is arranged at a distance to the swing arm axis between the swing arm and a counter bearing which is fixed relative to the housing frame, in order to enable a rotation of the swing arm about the swing arm axis.

[0002] The present invention relates to roller crushers in which the crushing material to be comminuted is crushed between a roller and a swing arm arranged laterally thereto. Such a roller crusher can be configured, in particular, as an eccentric roller crusher or as a roller crusher with directly driven roller.

[0003] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.

[0004] Eccentric roller crushers, which are also referred to as Rotex crushers, are known, for instance, from the journal Aufbereitungs-Technik, Zeitschrift fur die Aufbereitung fester Rohstoffe, Volume 5 (1964), Issue 5, pages 242 to 247, and Aufbereitungs-Technik, Zeitschrift fur die Aufbereitung fester Rohstoffe, Volume 6 (1966), issue 3, pages 166 to 174 [Processing Technology Journal for the Processing of Solid Raw Materials]. In the known embodiments of eccentric roller crushers, the swing arm is suspended obliquely above the roller and is pivotable in order to be able to adjust both the entrance gap and the exit gap. During operation of the roller crusher, the swing arm is fixed in its position, however, so as to be able to comminute the crushing material, in particular rock. In order to adjust the gap, a gap adjusting device is firstly provided. In addition, it can also occur during operation, however, that foreign matter, which is too hard and cannot be crushed, gets into the crushing material. There is then the danger that the crushing gap becomes clogged, or even that the roller usually furnished with crusher jaws and the swing arm furnished with crusher jaws get damaged. It is therefore known to

2013339535 28 Feb 2018 equip eccentric roller crushers with an overload protection, which overload protections are arranged between the swing arm and a counter bearing which is fixed relative to the housing frame. The pretensioning force of the springs is chosen such that they do not deflect under normal crushing load. If, on the other hand, there is a threat of overloading of the crusher jaws, the swing arm can retreat counter to the force of the springs and thus expand the crushing chamber so as to be able, where necessary, to discharge foreign bodies. It has proved disadvantageous, however, that very large, stable springs, which do not deflect under normal crushing load, must be used for support. Furthermore, the transition region, due to the typical spring characteristic, can also be adjusted only with difficulty. There is also the drawback that very large spring forces continue to act in the course of the spring-back, so that damage cannot be precluded. Finally, in the use of springs, an undefined transition region can also be present, in which the springs are only partially compressed, resulting in an undefined operating state which at length, for instance, can lead to an incorrect grain size of the crushed crushing material.

[0005] In eccentric roller crushers, a swing arm can be provided on both sides of the roller. The appropriate overload protection can then also be provided on both swing arms.

[0006] Eccentric roller crushers comprising an overload protection involving springs are also known from DE 1 257 004 and DE 2 733 379 A1.

[0007] DE 1 889 686 discloses an eccentric roller crusher in which an adjustment of the two swing arms arranged at the side of the roller is made via a simple adjusting spindle, so that a particularly simple embodiment is obtained. An overload protection is not realized however.

[0008] DE 1 875 346 describes an eccentric roller crusher, in which the swing arms are respectively supported by means of an adjusting device equipped with a hydraulic system and a spring. Here too, the whole of the force acting on the end of the loop is supported by means of the spring or the hydraulic system, so that an appropriately stable embodiment is necessary.

[0009] From WO 2007/01946 A2, in an eccentric roller crusher the support by means of a plurality of levers is known, so that an, all in all, a complex design is obtained.

[0010] DE 2 747 257 A1 describes an eccentric roller crusher in which the swing arm has an overload protection in the form of an electromagnet. In order to achieve sufficient

2013339535 28 Feb 2018 retaining forces, the electromagnet must be dimensioned appropriately large and supplied with large currents. The advantage is obtained, however, that, in the event of overloading of the swing arm, no further force increase occurs in the course of retreat. Rather, the swing arm can be released by switch-off of the electromagnet, without a significant counterforce. Finally, there is also the danger of uncontrolled vibrations, as can occur with springs.

[0011] The present invention is not limited to an embodiment of the roller crusher as an eccentric roller crusher. For instance, US 1 141 643 and DE 1 077 037 show roller crushers of the generic type comprising a directly rotatingly driven roller. This roller cooperates with a swing arm, which is held by an overload protection equipped with springs.

[0012] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0013] Advantageously, a preferred embodiment of the present invention seeks to improve the design and functionality of an adjusting device between the swing arm and the fixed counter bearing.

[0014] Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”.

[0015] According to the invention, there is provided a roller crusher comprising a housing frame, a rotatable roller, a swing arm mounted on a swing arm axis on the housing frame, a crushing chamber between the roller and the swing arm, and an adjusting device, which is arranged at a distance to the swing arm axis between the swing arm and a counter bearing which is fixed relative to the housing frame, in order to enable a rotation of the swing arm about the swing arm axis, wherein the adjusting device has a wedge arranged between the swing arm and the counter bearing, wherein, in a second position of the wedge in the gap, the distance formed between the swing arm and the roller (2) is greater than in a first position, and wherein the wedge bridges a gap between a contact surface arranged on the back of a swing arm and a counter surface assigned to the counter bearing, and wherein the counter bearing is formed by a rotational axis, on which a counter element, with the thereon formed counter surfaces, is freely rotatable.

2013339535 28 Feb 2018

Preferably, in a second position of the wedge in the gap, the distance formed between the swing arm and the roller is greater than in a first position. The first position and the second position can be constituted, in particular, by a first end position and a second end position, between which the wedge is adjustable. The use of a wedge allows a large part of the force acting on the swing arm to be transmitted via the wedge to the fixed counter bearing, while avoiding that the forces act in equal measure in a direction of adjustment of the wedge. According to the invention, the path between the first position and the second position thus differs from the direction of the force transmission from the swing arm to the fixed counter bearing.

[0016] The adjusting device can be used to adjust the distance between the swing arm and the roller, and thus also the crushing gap relevant to the crushing. Within the scope of such an embodiment, the adjusting device has a wedge drive, with which the wedge is adjustable between the first position and the second position continuously or in a plurality of intermediate positions.

[0017] Furthermore, the adjusting device according to the invention, comprising the wedge, also enables the realization of an overload protection, wherein then, in the event of a predefined force influence on the swing arm, the wedge is displaced in the direction of the second position in order to widen the distance between the swing arm and the roller and thus expand the crushing chamber formed between the swing arm and the roller. Usually both functions, namely the adjustment of the distance between the swing arm and the roller and the provision of an overload protection, are combined in an adjusting device according to the invention.

[0018] Starting from the described basic concept of the present invention, various preferred refinements are obtained.

[0019] it can thus be provided, for instance, that the wedge, as a result of a modified wedge shape of the gap between the contact surface and the counter surface, is pushed constantly in the direction of the second position.

[0020] If, starting from such an embodiment, the retaining forces of the wedge on the contact surface and on the counter surface are smaller than the forces which push the gap in the direction of the second position, the wedge, following decoupling from a wedge drive or a retaining device, moves automatically in the direction of the second position. In the event of such a decoupling, which is attributable, for instance, to a fault or an

2013339535 28 Feb 2018 overload, the swing arm then opens automatically, whereby damage can be prevented under all circumstances.

[0021] As already previously explained, the wedge shape can achieve the effect that the retaining forces which are necessary to hold the wedge in a predefined position within the gap are markedly lower than the force transmitted from the swing arm via the wedge to the counter bearing. The retaining force can, for instance, be less than 20 % of the force transmitted from the swing arm via the wedge to the counter bearing. The drive for the wedge can thus be dimensioned appropriately smali, while, at the same time, a particularly good functionality is achieved. In comparison to known adjusting devices, together with the reduction in forces acting on the adjusting device a larger adjustment path is obtained in order to move the swing arm, whereby the distance between the roller and the swing arm can be adjusted with greater accuracy.

[0022] The wedge is displaceable along a, depending on the embodiment, substantially straight or slightly curved direction of adjustment between the first position and the second position. Preferably, the direction of adjustment forms an angle of less than 30° in relation to a connecting line between the swing arm axis and the wedge in the second position. The adjustment is thus made, in relation to the swing arm, then roughly in the radial direction.

[0023] In order to enable good mobility of the wedge in the gap between the contact surface and the counter surface, the gap can also be equipped with an antifriction coating or with sliding elements. The same applies also to the contact surface and the counter surface, wherein the frictional properties of the selected material combination are crucial.

[0024] The adjusting device can be of purely mechanical or purely hydraulic configuration, though mechanical and hydraulic components can also be mutually combined. If the wedge, for instance, is hydraulically driven, the wedge, in the event of an overload, can immediately be fully released with a bypass valve, so that the swing arm then fully opens without a significant counterforce. Alternatively, it is also possible to use a pressure relief valve, wherein the swing arm then opens at least counter to a substantially constant counterforce.

[0025] Alternatively, the wedge drive can also be of mechanical construction. The wedge can be displaced, for instance, by means of an adjusting spindle, a servomotor or the like, wherein a release of the gap in the event of an overload is realized by a

2013339535 28 Feb 2018 mechanical decoupling from the wedge drive. Within the scope of a particularly simple embodiment, a mechanical predetermined breaking point can be provided, wherein the part, for instance a connecting rod or an adjusting spindle, has then to be replaced upon renewed start-up. In principle, various overload protections can also be mutually combined in order to enable a double or two-stage protection.

[0026] Within the scope of the invention, it should be borne in mind that, upon an adjustment of the swing arm, the orientation of the contact surface formed on the back of the swing arm also changes. In order to be able to follow a different orientation of the mutually facing surfaces, according to a preferred design embodiment of the invention it is provided that the counter bearing is formed by a rotational axis on which a counter element, with the counter surface formed thereon, is freely rotatable. The adjusting device with the wedge can also be rotatably suspended.

[0027] The invention is explained below with reference to a drawing that represents merely an illustrative embodiment, wherein:

[0028] fig. 1a shows a schematic longitudinal section of a roller crusher according to the invention, [0029] fig. 1b shows the roller crusher according to 1a with a different setting of a swing arm, [0030] fig. 2 shows a detailed view of an adjusting device represented in figs. 1a and 1b.

[0031] Fig. 1a shows in a schematic longitudinal section a roller crusher according to the invention, which is configured, by way of example, as an eccentric roller crusher. The roller crusher comprises a housing frame 1, a rotatable roller 2, a swing arm 4 mounted on a swing arm axis 3 on the housing frame 1, a crushing chamber 5 between the roller 2 and the swing arm 4, and an adjusting device 6, which is arranged at a distance to the swing arm axis 3 between the swing arm 4 and a counter bearing 7 which is fixed relative to the housing frame 1, in order to enable a rotation of the swing arm 4 about the swing arm axis 3. Fig. 1b differs from fig. 1a merely in the setting of a wedge 8, wherein the wedge 8 in fig. 1a is in a second position P2 and in fig. 1b in a first position P1.

2013339535 28 Feb 2018

Ί [0032] According to the invention, the adjusting device 6 has the wedge 8, which is arranged in a gap between a contact surface 9 formed on the back of the swing arm and a counter surface 10 assigned to the counter bearing 7. The wedge 8 can be positioned within the gap with a wedge drive 11 of the adjusting device 6 in order to change the distance between the swing arm 4 and the roller 2, and thus the effective crushing gap. If the wedge 8 is moved downward in the direction of a second position, the distance between the roller 2 and the swing arm 4 increases. If the wedge 8, on the other hand, is moved upward in the direction of a first position P1, the gap between the roller 2 and the swing arm 4 diminishes.

[0033] The wedge 8, the contact surface 9 and the counter surface 10 are oriented with respect to one another such that the wedge 8 is pushed downward, i.e. in the direction of the second position P2, by the forces acting on the swing arm 4. In particular, the wedge 8 can be designed to move, following decoupling from the wedge drive 11, automatically in the direction of the second position P2, i.e. downward, in the represented design embodiment, the advantage is also obtained that the movement of the wedge 8 in the direction of the second position P2 is aided by the weight force of the wedge 8.

[0034] in the represented illustrative embodiment is provided a hydraulic wedge drive 11, which is represented, in particular, also in fig. 2. The wedge drive 11 comprises a hydraulic pressure cylinder 12, which is equipped with a bypass valve. It can be equated to the previously described decoupling from the wedge drive 11 if the bypass valve of the pressure cylinder 12 opens at a preset pressure and thus releases a movement of the wedge 8, whereby the latter is moved automatically in the direction of the second position P2.

[0035] In this context, it can also be inferred from fig. 2 that the wedge 8 is equipped with sliding elements 13, wherein the sliding elements 13 bear against the contact surface 9 and against the counter surface 10.

[0036] According to an alternative embodiment of the invention, a purely mechanical wedge drive can also be provided, wherein an overload protection, for instance, is then provided by a mechanical predetermined breaking point.

[0037] The embodiment represented in Fig. 1a achieves the effect that the retaining force which is necessary to hold the wedge 8 in a predefined position of the gap is markedly smaller than the force transmitted from the swing arm 4 via the wedge 8 to the

2013339535 28 Feb 2018 counter bearing 7. The retaining force can be, for instance, less than 20 % of the transmitted force. It can thus be seen that, in comparison to the prior art, a considerably smaller layout of the entire adjusting device 6 is possible.

[0038] It is also apparent that a direction of adjustment between the first position P1 and the second position P2, starting from the swing arm axis 3, runs substantially in the radial direction. Preferably, the direction of adjustment between the first position P1 and the second position P2 forms an angle a of less than 30° in relation to a connecting line between the swing arm axis 3 and the wedge 8 in the second position P2 remote from the swing arm axis 3.

[0039] From fig. 1a, it is also evident that, upon a rotation of the swing arm 4 about the swing arm axis 3, the orientation of the contact surface 9 is changed, in order to be able to follow this change of orientation, the counter bearing 7 is formed by a rotational axis, on which a counter element 14, represented in fig. 2, is freely rotatable, wherein the counter surface 10 is a portion of the counter element 14.

[0040] Finally, according to fig. 1a, the wedge drive 11, with the wedge 8 connected thereto, is also movable about a tilt axis 15.

2013339535 28 Feb 2018

Claims

CLAIMS

1. A roller crusher comprising a housing frame, a rotatable roller, a swing arm mounted on a swing arm axis on the housing frame, a crushing chamber between the roller and the swing arm, and an adjusting device, which is arranged at a distance to the swing arm axis between the swing arm and a counter bearing which is fixed relative to the housing frame, in order to enable a rotation of the swing arm about the swing arm axis, wherein the adjusting device has a wedge arranged between the swing arm and the counter bearing, wherein, in a second position (P2) of the wedge in the gap, the distance formed between the swing arm and the roller is greater than in a first position (P1), and wherein said wedge bridges a gap between a contact surface arranged on the back of a swing arm and a counter surface assigned to the counter bearing, and wherein the counter bearing is formed by a rotational axis, on which a counter element, with the thereon formed counter surfaces, is freely rotatable.

2. The roller crusher as claimed in claim 1, wherein the adjusting device has an overload protection.

3. The roller crusher as claimed in claim 2, wherein the overload protection has a mechanical predetermined breaking point.

4. The roller crusher as claimed in claim 2 or 3, wherein the overload protection has a hydraulic valve.

5. The roller crusher as claimed in any one of claims 1 to 4, wherein the adjusting device has a wedge drive, with which the wedge is adjustable between the first position and the second position continuously or in a plurality of intermediate positions.

6. The roller crusher as claimed in any one of claims 1 to 5, wherein the wedge is displaceable along a direction of adjustment between the first position and the second position, wherein the adjusting device forms an angle of less than 30 ° in relation to a connecting line between the swing arm axis and the wedge in the second position.

WO 2014/067882

PCT / EP2013 / 072465

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WO 2014/067882

PCT / EP2013 / 072465

WO 2014/067882

PCT / EP2013 / 072465