WO2024110881A1

WO2024110881A1 - Crushing jaw set for a crusher and crusher with a crushing jaw set

Info

Publication number: WO2024110881A1
Application number: PCT/IB2023/061769
Authority: WO
Inventors: Piotr SZCZELINA; Nicolai PAPAJEWSKI; Tobias Koch; Ingo Neitemeier; Dennis ACHZIGER
Original assignee: Flsmidth A/S
Priority date: 2022-11-22
Filing date: 2023-11-22
Publication date: 2024-05-30

Abstract

The invention relates to a crushing jaw set (50) for a crusher (1), comprising a first crushing jaw unit (52) for a first working unit (8) and a second crushing jaw unit (54), wherein between the first and the second working unit (8, 4) a crushing chamber (9) is defined, wherein the first crushing jaw unit (52) comprises at least a first and second crushing jaw (61, 62), wherein the first and second crushing jaws (61, 62) are separated at a first jaw parting plane (BE1), which is aligned transversely to a material flow direction of the crusher (1) wherein at least the first crushing jaw (61) is formed from two or more first crushing jaw segments (72a-72h), each of which is separated at a segment parting plane (SE) which is perpendicular to the first (BE1). The invention further relates to a crusher (1) and a maintenance method.

Description

Crushing jaw set for a crusher and crusher with a crushing jaw set

The invention relates to a crushing jaw set for a crusher, comprising a first crushing jaw unit for a first working unit of the crusher, and a second crushing jaw unit for a second working unit of the crusher, wherein a crushing chamber is defined between the first and the second working unit, wherein the first crushing jaw unit comprises at least a first and a second crushing jaw, and the second crushing jaw unit comprises at least a third and optionally a fourth crushing jaw, wherein the first and the second crushing jaws are separated at a first jaw parting plane which is oriented transversely to a material flow direction of the crusher, and wherein optionally the third and fourth crushing jaws are separated at a second jaw parting plane which is oriented transversely to a material flow direction of the crusher. The invention further relates to a crusher with such a crushing jaw set. The invention further relates to a maintenance method for a crusher.

In pressure comminution systems, in particular crushing systems with eccentric rolls as a movable crushing element or jaw crushers with a movable rocker, a plurality of crushing jaws arranged one above the other generally serves as the stationary crushing element, which can form a crushing jaw set within the meaning of the present invention. An eccentric roll, for example, which is arranged at a distance from the stationary crushing jaws and which carries out an eccentric movement with respect to an axis of the eccentric roll, through which the distance from the crushing jaws changes periodically, serves as a movable crushing element. In other types of crushers, such as a jaw crusher, a movable rocker serves as a movable crushing element. In this type of crushing system, the crushing gap is defined by the distance between the outer circumference of the eccentric roll or the movable rocker and the surface of the crushing jaws facing it. At least two, preferably three or more crushing jaws forming a crushing jaw set are usually arranged one above the other and, depending on the design, can also be arranged along an arc. Embodiments are also preferred in which the first and/or the second crushing jaw unit each comprise only one crushing jaw.

If a crushing jaw set is provided with, for example, two or three crushing jaws, then a crushing jaw referred to herein as the “upper” lies with its surface facing the movable crushing element further away from the movable crushing element than the next crushing jaw arranged below it, which can be referred to herein as the “lower” when there are a total of two crushing jaws and as the “middle” crushing jaw when there are a total of three or more crushing jaws. During the crushing process, the material to be comminuted moves from top to bottom in the direction of gravity, which is why the aforementioned names have been chosen. From this point of view, one crushing jaw is located furthest up and one crushing jaw is furthest down, thus closest to the movable crushing element, and since the intermediate space between the movable and the stationary crushing element, which acts as a crushing gap, tapers continuously, the crushing gap is narrower in the region of the crushing jaw(s) further down than in the crushing jaw(s) further up. This means that during the comminution process, the crushing jaw or the crushing jaws in which the crushing gap is narrower are subjected to more intensive mechanical stress than the crushing jaw or the crushing jaws in which the crushing gap is wider. In other words, crushing jaws located further up are subjected to less stress and crushing jaws located further down, which are located where the crushing gap narrows, are subjected to greater stress. This means that the lower crushing jaw(s) is/are subject to greater wear than the upper crushing jaw(s).

During a maintenance measure, when the wear limit of the lower crushing jaw is reached, it is either possible to replace all of the crushing jaws of a crushing jaw set at the same time or, alternatively, the crushing jaws could be replaced one after the other during multiple maintenance measures, i.e. only one crushing jaw is replaced when its individual wear limit has been reached. The first-mentioned variant has the disadvantage that material from crushing jaws (the upper crushing jaws) is disposed of, which are not yet worn out and could in principle still be used. The disadvantage of the second variant is that more frequent maintenance interruptions are necessary, which leads to a high level of production downtime and the resulting loss of production. Alternatively, it would be possible to exchange two differently worn crushing jaws, but this would also lead to the system coming to a standstill. DE 10 2019 204 836 B3, for example, deals with this problem.

Another problem nowadays is that the sizes of the crushers are increasing. Medium crusher sizes now reach approximately 600 to 1000 t per hour, but large machines for over 8000 t per hour are also available. The larger the crusher is, the larger the crushing jaws must be in order to be able to process such volumes of primary feed material.

An object of the present invention is therefore to provide a crushing jaw set for a crusher as well as a crusher and a maintenance method which are improved in terms of wear, material use, production and/or maintenance.

The invention solves the problem in a first aspect by a crushing jaw set of the type mentioned, wherein at least the first crushing jaw is formed from two or more first crushing jaw segments, each of which is separated at a segment parting plane that is perpendicular to the first jaw parting plane. The first jaw parting plane is a parting plane between the above-mentioned upper, middle and lower crushing jaws and is arranged parallel to the axis of rotation of the roll, for example in an eccentric roll crusher. In a jaw crusher, the first jaw parting plane is parallel to the pivot or rotation axis of the movable crushing element, which in the case of a jaw crusher is a movable rocker. The segment parting plane or segment parting planes are perpendicular to the first jaw parting plane and therefore, for example, perpendicular to the axis of rotation of the roll of the eccentric roll crusher or perpendicular to the pivot axis or axis of rotation of the movable crushing element of a jaw crusher. Typically, the first crushing jaw is designed to be segmented in the vertical direction and is formed from two or more first crushing jaw segments. Depending on the type of crusher, the second crushing jaw unit can also comprise at least a fourth crushing jaw in addition to the third crushing jaw, wherein the third and fourth crushing jaws are then preferably separated at a second jaw parting plane which is aligned transversely to the material flow direction of the crusher. The second jaw parting plane is therefore preferably parallel to the first jaw parting plane.

The invention is therefore based on the knowledge that this segmentation brings with it several advantages. On the one hand, the segmentation of the crushing jaw in the vertical direction, i.e. the segment parting plane runs in the vertical direction, significantly simplifies the production of the crushing jaw segments by casting. The individual crushing jaw segments are smaller and have a lower volume than the non-segmented crushing jaw, making casting easier. Problems such as voids or defects occur more frequently in large castings, as do internal stresses. This can be remedied by segmenting the crushing jaw in a vertical direction. Furthermore, the casting of large components made of special materials is particularly problematic and involves high costs. This problem is also at least partially improved by the crushing jaw segments. For example, the segmentation of the crushing jaw into the first crushing jaw segments enables the provision of crushing jaw segments made of different materials, whereby in particular the locations of the crushing jaw that are particularly affected by wear can be made of stronger materials and/or special materials, while the sections that are less susceptible to wear can be made of can be made using conventional steel. Finally, handling, logistics and storage are also simplified. Large crushing elements are also significantly more complex to handle due to their weight and dimensions. This is also improved by the crushing jaw segments according to the invention.

Preferably, the first crushing jaw is formed from at least three, preferably six crushing jaw segments. Other quantities are also preferred. According to the invention, at least two crushing jaw segments are provided, but four, five, six, seven, eight, nine, ten or more crushing jaw segments can also be provided. Preferably, the crushing jaw segments are designed identically, or there are two, three or more classes of crushing jaw segments, each comprising at least two crushing jaw segments that are identically designed. It can also be provided that laterally peripheral crushing jaw segments are designed separately and are not identical, while at least two crushing jaw segments arranged between the peripheral crushing jaw segments are designed identically. In this way, production can be further simplified and the same parts can be used. There is also the option of replacing just individual crushing jaw segments and not replacing the entire crushing jaw if it is worn out.

More preferably, the first crushing jaw segments have a cuboid basic shape and a ratio of the longest side to the shortest side is preferably in a range from 1 :2 to 1 :10. This creates a shape that is advantageous both for casting and for later handling and storage, which can significantly simplify these processes. Subranges within the range mentioned are also preferred, such as 1 :2 to 1 :9, 1 :2 to 1 :8, 1 :2 to 1 :7, 1 :2 to 1 :6, 1 :2 to 1 :5, 1 :3 to 1 :9, 1 :4 to 1 :9, 1 :5 to 1 :9, 1 :6 to 1 :9. More preferably, the lower limit value of the range can take any of the values 1 :2, 1 :3, 1 :4, 1 :5, 1 :6, 1 :7, 1 :8, 1 :9, while the upper limit value can take any of the values 1 :3, 1 :4, 1 :5, 1 :6, 1 :7, 1 :8, 1 :9;

1 :10.

In a preferred development, at least one of the crushing jaw segments is made of a first material and at least one of the crushing jaw segments is made of a second material, which is different from the first material. For example, one or more crushing jaw segments in a central region are made of a more wear-resistant material than crushing jaw segments in an edge region. The term wear resistance corresponds to wearability according to DIN 50320, i.e., the resistance of a solid body to wear, for example abrasion. For example, the first material, which is preferably a wearresistant material, is a metal matrix composite material. Preferred materials include, for example, manganese hard steel, Cr-Mo steels, high chromium steels, metal matrix composite materials, or even rolled wear-resistant steels, e.g. Hardox® from SSAB AB, Sweden.

Furthermore, it is also conceivable that one or more of the crushing jaw segments are provided with an inlay according to DE 10 2019 204 836 B3, so that the remaining crushing jaw segments can be made of conventional steel. In this way, costs can be further reduced and recycling is also simplified.

In a preferred development, the first crushing jaw segments each have at least one through opening for receiving at least one mounting rod, wherein the through openings are aligned with one another in a mounted state of the first crushing jaw segments. The mounting rod can be guided through the through opening and secured on both sides, for example with a nut or other fastening means. This allows the crushing jaw segments, which together form a first crushing jaw, to be transported and stored together if this is desired. In particular, mounting can be simplified in this way, since all crushing jaw segments can be arranged together and already positioned correctly relative to one another on the corresponding receptacle of the crusher. It can also be provided that two or more through openings are provided per crushing jaw segment and/or two or more mounting rods.

Preferably, two or more of the first crushing jaw segments have at least one lateral contact projection with a contact surface for mutual contact with and placement next to adjacent crushing jaw segments. Preferably, the adjacent crushing jaw segments also have such lateral contact projections on their contact surfaces. The peripheral crushing jaw segments do not necessarily need such contact projections on their outer sides, but it can have advantages to also equip the peripheral crushing jaw segments with such lateral contact projections. This means that in particular the same parts can be used, which can further reduce costs. If the first crushing jaw segments are designed as a cast part, it is preferred that the contact projection or the contact projections are designed as a casting piece. The contact surface is preferably machined. Forming the contact projections using castings offers advantages in terms of casting technology, particularly in mold making. Only the projecting end faces of the contact projections, which are then also used as contact surfaces, are machined in this case, preferably mechanically machined, in order to produce a defined contact surface. It has been found that the crushing jaw segments are deformed during operation of the crusher, so that they expand laterally and flatten in the axial direction. The contact projections allow this lateral expansion in that the crushing jaw segments do not rest against each other over the entire surface, but only on the contact surfaces. The contact surfaces preferably occupy an area proportion of <30% of the lateral surface, preferably <20%, more preferably <15%, more preferably <10%. According to a preferred embodiment, it is provided that at least the first crushing jaw segments provided at the lateral ends of the first and second crushing jaws are provided with form-fitting elements for laterally holding the first crushing jaw segments. The first crushing jaw segments provided at the lateral ends of the first crushing jaw are the crushing jaw segments which are peripheral in the axial direction. At least on these, form-fitting elements are preferably provided, which hold the crushing jaw segments at horizontal axial ends of the crushing jaw. The form-fitting elements can be designed, for example, as recesses, undercuts, projections, grooves or the like. Preferably, the corresponding crusher-side receptacle, such as a rocker or stationary crusher element, has corresponding form-fitting elements, so that the crushing jaw segments can be held thereon in a form-fitting manner. The form-fitting elements on the crusher-side receptacle are also intended to absorb lateral forces that are caused by the deformation of the crushing jaw segments during the crushing process.

While the invention has been described in each case with reference to the first crushing jaw, it should be understood that in preferred embodiments the second, the third and/or a fourth crushing jaw can also be formed from two or more second, third or fourth crushing jaw segments. These crushing jaw segments are also preferably each separated at a segment parting plane that is perpendicular to the first and second jaw parting planes. It can also be provided that all crushing jaws of a crusher are segmented in the manner according to the invention.

In a second aspect of the invention, the aforementioned object is achieved by a crusher for comminuting rock, with a first working unit, which is equipped with a first crushing jaw unit, and a second working unit, which is equipped with a second crushing jaw unit, wherein between the first and the second working unit a crushing chamber is defined, wherein the first crushing jaw unit comprises at least a first and a second crushing jaw, and the second crushing jaw unit comprises at least a third and optionally a fourth crushing jaw, wherein the first and the second crushing jaws are separated at a first jaw parting plane which is oriented transversely to a material flow direction of the crusher, and wherein the third and the optional fourth crushing jaws are separated at an optional second jaw parting plane which is oriented transversely to a material flow direction of the crusher, wherein at least the first crushing jaw consists of two or more first crushing jaw segments, each of which is separated at a segment parting plane that is perpendicular to the first and second jaw parting planes. It is to be understood that the crushing jaw set according to the first aspect of the invention and the crusher according to the second aspect of the invention have the same and similar sub-aspects as set out in particular in the dependent claims. In particular, the crusher according to the second aspect of the invention has a crushing jaw set according to the first aspect of the invention, so that full reference is made to the above description.

In a preferred development of the crusher according to the second aspect of the invention, the second, the third and/or the fourth crushing jaw are also formed from two or more second, third or fourth crushing jaw segments, which are each separated at a segment parting plane that is perpendicular to the first and second jaw parting planes.

Preferably, the first working unit is substantially stationary during operation of the crusher and the second working unit carries out an oscillating crushing movement during operation of the crusher. The first working unit can, for example, be designed as a rocker and the second working unit as an eccentric roll if the crusher is designed as an eccentric roll crusher. If the crusher is designed as a jaw crusher, the first working unit is preferably a stationary support structure or a stationary crusher element, and the second working unit is a movable crusher element, preferably a movable jaw crushing rocker.

In a third aspect of the invention, the aforementioned object is achieved by a maintenance method for servicing a crusher according to any one of the above preferred embodiments of a crusher according to the second aspect of the invention, comprising the steps: dismantling one or more of the first crushing jaw segments of the crusher; providing replacement crushing jaw segments to replace the dismantled first crushing jaw segments; and installing the replacement crushing jaw segments. Some of the steps can be carried out in parallel or one after the other. Preferably, the maintenance method also includes the step: Coupling the one or more first crushing jaw segments before dismantling. Providing preferably includes providing mechanically coupled replacement crushing jaw segments and mounting the mechanically coupled replacement crushing jaw segments and then mechanically uncoupling the replacement crushing jaw segments. The mechanical coupling of the first crushing jaw segments or the replacement crushing jaw segments can be realized, for example, by means of a rod which is guided through openings in the crushing jaw segments.

It is to be understood that the method according to the third aspect of the invention, the crushing jaw set according to the first aspect of the invention and the crusher according to the second aspect of the invention have the same and similar sub-aspects as set out in particular in the dependent claims. In this respect, full reference is made to the above description.

Embodiments of the invention will now be described below with reference to the drawings. These are not necessarily intended to represent the embodiments to scale; rather, if this is useful for explanation, the drawings are executed in a schematic and/or slightly distorted form. With regard to additions to the teachings immediately apparent from the drawings, reference is made to the relevant prior art. It should be noted that various modifications and changes can be made to the form and detail of an embodiment without departing from the general idea of the invention. The features of the invention disclosed in the description, in the drawings and in the claims can be essential for the development of the invention both individually and in any combination. In addition, all combinations of at least two of the features disclosed in the description, the drawings and/or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiments shown and described hereinafter or limited to a subject matter that would be limited in comparison to the subject matter claimed in the claims. For specified design ranges, values within the specified limits should also be disclosed as limit values and can be used and claimed as desired. For the sake of simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar functions.

Further advantages, features and details of the invention emerge from the following description of the preferred embodiments and from the drawings; in the following:

Figure 1 shows a sectional view of a crusher in a first exemplary embodiment;

Figure 2 shows a perspective view of a crushing jaw set according to the prior art;

Figure 3 shows a perspective view of a crushing jaw set according to the invention;

Figure 4 shows a perspective view of the first crushing jaw according to the invention;

Figure 5 shows a perspective view of a crushing jaw segment;

Figure 6 shows a sectional view of a crushing jaw segment in a second embodiment;

Figure 7 shows a rear view of the first crushing jaw according to Figure 4; and

Figure 8 shows a perspective view of a first working unit without a first crushing jaw.

In Figure 1 , an eccentric roll crusher 1 , also called ERC, is shown as an example. It comprises a machine frame 2, a rotatable roll 4, which here forms a second working unit, a first working unit 8 mounted on a rocker axle 6 on the machine frame 2, here designed as a rocker 8, a crushing chamber 9 between roll 4 and rocker 8, as well as a screening chamber 7, below a screening device 40. At the lower end of the crushing chamber 9, a crushing gap BS is formed between the rocker 8 and the roll 4, which defines the smallest distance between the roll 4 and the rocker 8. During operation, the roll 4 rotates about an axis of rotation 5, wherein the roll 4 is designed here with an eccentricity, so that the roll body 4 rotates eccentrically about the axis of rotation 5. When the roll 4 rotates eccentrically, the distance between the roll 4 and the rocker 8 changes, so that material to be crushed that is placed in the crushing chamber 9 can be comminuted. The rocker 8 can also be referred to as the first working unit or stationary crushing element, and the roll 4 as the second working unit or movable crushing element.

The rocker 8 is here provided with a rocker adjustment device 10, which can be designed as known from WO 2014/067882 A2. Specifically, the rocker adjustment device 10 comprises a rocker wedge 12, which is arranged in a gap between a contact surface 13 formed on the rear side of the rocker and a counter surface 15 assigned to a rocker abutment 14. The rocker wedge 12 can be positioned within the gap with a rocker wedge drive 16 of the rocker adjustment device 10 in order to change the distance between the rocker 8 and roll 4 and thus the effective crushing gap BS. If the rocker wedge 12 is moved downwards with reference to Figure 2, the distance between roll 4 and rocker 8 increases. However, if the rocker wedge 12 is moved upwards, the crushing gap BS between roll 4 and rocker 8 decreases.

The rocker wedge 12, the contact surface 13 and the counter surface 15 are aligned with one another in such a way that the rocker wedge 12 is forced downwards by the forces acting on the rocker 8. The geometry of the contact surface 13, the counter surface 15 and the rocker wedge 12 is selected so that the rocker wedge 12 is not self-locking, i.e. no self-locking occurs. In particular, the rocker wedge 12 can be set up to automatically move downwards after decoupling from the rocker wedge drive 16. The counter surface 15 is formed on a counterholder 17, which forms a fixed bearing but is rotatably arranged around the abutment 14, which is designed as an axle journal. In this way, the counter surface 15 can rotate around the abutment 14 when the rocker wedge 12 is adjusted. This takes into account the fact that the rocker 8 rotates about the rocker axle 6 when the rocker wedge 12 is adjusted.

In the exemplary embodiment shown here (Figure 1), the rocker wedge drive 16 comprises, for example, a hydraulic or pneumatic drive 18, with a hydraulic or pneumatic cylinder 19, which is here firmly connected to the rocker 8, and a hydraulic or pneumatic piston 20, which is articulated with the rocker wedge 12. By appropriately applying hydraulic or pneumatic pressure inside the hydraulic or pneumatic cylinder 19, the hydraulic or pneumatic piston 20 can be moved up or down with reference to Figure 1 in order to adjust the rocker wedge 12. However, other types of drive are also conceivable and preferred here, such as a spindle drive, an electromechanical or electromagnetic drive, a purely mechanical preload by means of a spring and/or a weight. Further examples can also be found in the disclosure of DE 10 2022 125 159, the disclosure of which is to be fully incorporated herein.

The rocker adjustment device 10 also includes a rocker overload protection 22, which here includes a pressure relief valve 23, such that hydraulic or pneumatic fluid can be released from the pressure relief valve 23 when the rocker 8 is overloaded in order to bring the rocker wedge 12 to a lower position and thus widen the crushing gap BS. Alternatively or additionally, the pressure relief valve 23 can also be actively opened, for example based on a signal which is generated based on a load determination on one or more of the load-bearing parts of the eccentric roll crusher 1 .

Overload protection can also be provided on the roll 4. For this purpose, it is conceivable, for example, that the roll 4 is displaceably mounted and prestressed with one or more springs, as also described in DE 10 2022 125 159, to which reference is made.

In Figure 1 it can also be seen that a screening device 40 is provided above the roll 4, which can be supported on the one hand on a stationary abutment 42 on the machine frame 2 and on the other hand on a support surface of the roll 4 and/or on the machine frame 2. An eccentric rotation of the roll 4 causes a shaking movement on the support surface between the screening device 40 and the roll 4. The screening device 40 can also rotate about the abutment 42, so that the screening device 40 can compensate for an eccentric rotation of the roll 4. The screening device 40 is designed in such a way that material to be crushed below a predetermined size falls through the screen and, with reference to Figure 1 , can be guided past the roll 4 on the left, i.e. it does not reach the crushing chamber 9. Only material to be crushed with a size above the predetermined size is fed to the crushing chamber 9. The screening device 40 is preferably designed in accordance with WO 2014/067867 and can have one or all of the features of the screening device described there. In particular, it can be provided that the screening device 2 comprises a finger screen and/or sliding shoes are provided and/or elastic damping elements and/or rubber buffers.

The eccentric roll crusher 1 also has a guide element 44 that is separate from the rocker 8 and is attached to the machine frame or housing 2. The guide element 44 is separate from the rocker 8 and is stationary and does not move together with the rocker 8, neither when adjusting the crushing gap BS nor during any overload compensation movement of the rocker 8. The guide element 44 is preferably formed in accordance with WO 2014/067858 A1 and has one or all of the features of the guide element according to WO 2014/067858 A1 .

The crusher 1 , here eccentric roll crusher 1 , is equipped with a crushing jaw set 50, which here has a first crushing jaw unit 52, which is arranged on the rocker 8 and the optional guide element 44, and a second crushing jaw unit 54, which is provided on the roll 4. Together, the first and second crushing jaw units 52, 54 form the crushing jaw set, which can also comprise further crushing jaw units in addition to the first and second crushing jaw units 52, 54. There can also be embodiments in which the crushing jaw set 50 only has a first crushing jaw unit, or first and second crushing jaw units are both provided on the rocker 8 or both on the roll 4 or both on other elements of a crusher not shown here. In the exemplary embodiment shown here, the first crushing jaw unit 52 comprises a first crushing jaw 61 and a second crushing jaw 62. In the exemplary embodiment shown here, the second crushing jaw unit 54 comprises at least a third crushing jaw 63 and a fourth crushing jaw 64, wherein it can be seen from Figure 1 that in addition to the third and fourth crushing jaws 63, 64 a fifth to eighth crushing jaw are also provided (in Figure 1 not provided with reference numerals), wherein the third to eighth crushing jaws according to the exemplary embodiment shown in Figure 1 are arranged in a circle around the circumference of the roll 4, which defines the second working unit. On the rocker 8, which defines the first working unit, only the first and the second crushing jaw are provided, wherein a guide element crushing jaw 65 is arranged on the rocker side of the crushing chamber 9 by the guide element 44, which can be part of the first crushing jaw unit 52. As can be seen from Figure 1 , the crushing chamber 9 tapers downwards towards the crushing gap BS, so that wear is highest at the lower end in the region of the crushing gap and is lowest at the entrance region of the crushing chamber 9

The first and second crushing jaws 61 , 62 are separated at a first jaw parting plane BE1 (see also Figure 3), which, with reference to Figure 1 , runs perpendicular to the plane of the drawing and thus parallel to the axis of rotation of the roll 5 and the rocker axle 6. A material flow direction with reference to Figure 1 is from top to bottom along the crescent-shaped crushing chamber 9, so that the material flow direction with reference to Figure 1 lies within the plane of the drawing. The first jaw parting plane BE1 is therefore also perpendicular to the material flow direction of the crusher 1 . The third and fourth crushing jaws 63, 64 are separated at a second jaw parting plane BE2, which is parallel to the first jaw parting plane BE1 , and thus also transverse to the material flow direction of the crusher 1 .

In other embodiments of the crusher 1 , for example as a jaw crusher, such as in particular crank rocker crushers and pendulum rocker crushers, the crushing chamber 9 may not be crescentshaped, but rather funnel-shaped, for example, and the number of crushing jaws per crushing jaw unit may differ from the exemplary embodiment shown here (Figure 1). In this respect, the design of the crusher as an eccentric roll crusher is only optional and only an example.

In Figure 2, the rocker 8 together with the first crushing jaw unit 52 is shown in perspective, so that the first jaw parting plane BE1 can be seen better. The second crushing jaw 62 is profiled here with a total of five vertical grooves that run in the material flow direction and have a positive influence on the material flow. The first crushing jaw 61 has a wave-shaped profile (see also Figure 1), so that it thickens slightly towards the roll 4 in the region of the crushing gap BS. This is advantageous in terms of wear, since the thickened region of the first crushing jaw 61 is particularly affected by wear. The first and second crushing jaws 61 , 62 are mounted on a rocker frame 70, as is known in the prior art.

Figure 3 now shows a first crushing jaw unit 52 according to the invention with a first crushing jaw 61 and a second crushing jaw 62, which are separated at the first jaw parting plane BE1 .

In Figure 3, the first crushing jaw 61 is formed from a plurality, namely a total of eight, first crushing jaw segments 72a-72h (also denoted overall by 72), each of which is separated at a segment parting plane SE (only provided with a reference numeral once in Figure 3 as an example). . The segment parting plane E is perpendicular to the first jaw parting plane BE1 and thus also to the second jaw parting plane BE2. The first crushing jaw 61 with the first crushing jaw segments 72 is shown enlarged in Figure 4. The individual first crushing jaw segments 72a-72h rest against each other with their long sides and are each separated at the segment parting plane SE. The individual crushing jaw segments 72a-72h are completely separate and can be completely separated, as shown in Figure 4. They are individual components and, in the example shown in Figure 4, are held together only by a mounting rod 74, which is guided through a through opening 76 of the crushing jaw segments 72 (see Figures 5 and 6). The through openings 76 are aligned with one another in the mounted state, so that the mounting rod 74 can be passed through them, and are arranged in an upper section with respect to an mounted state of the first crushing jaw 61 , so that the crushing jaw segments 72 can hang on the mounting rod 74. The mounting rod 74 can be adapted to the through openings 76 in such a way that the crushing jaw segments 72 are aligned and/or centred relative to one another. The mounting rod 74 is here provided at axial ends with first and second handling elements, which can be fastened to the mounting rod 74, for example by a screw connection, or can be secured to it with separate nuts. The handling elements 78a, 78b serve to ensure that the first crushing jaw 61 can be lifted and positioned, for example by means of a crane or the like.

The crushing jaw segments 72 are in particular cuboid or have a cuboid basic shape with a length L and a width B. A ratio of length L to width B is preferably a ratio of 2:1 to 10:1 and in the specific exemplary embodiment shown in Figure 5 roughly in the range of 8:1. In Figure 5, the crushing jaw segment 72 is equipped with an unprofiled and flat surface facing the crushing chamber 9, while Figure 6 shows a variant in which the surface 80 facing the crushing chamber is profiled, here wave-shaped.

For example, the crushing jaw segment 72 is designed as a cast part. It preferably has at least one, preferably three contact projections 81 , 82, 83 as shown in Figure 5 on side surfaces that rest on other crushing jaw segments 72, which rest on corresponding lateral contact projections of the adjacent crushing jaw segment 72. The contact projections 81-83 can be designed, for example, as sprues. They preferably rise from the side surface by a few millimeters, so that lateral growth of the crushing jaw segments 72 is permitted, which can occur due to deformation during operation. The contact projections 81-83 are preferably machined, for example mechanically machined, to form flat, uniform and dimensionally stable contact surfaces. Preferably, the contact projections 81-83 are distributed over the length L and are provided, for example, as shown in Figure 5 at the upper end, lower end and in the middle. Of course, it can also be provided that the entire side surface is machined, or a larger number of contact projections, for example four, five or six, are provided.

On the rear side (see Figure 7), the first crushing jaw segments 72 are preferably provided with a cross-shaped profiling, or another profiling, in order to define recesses into which certain holding devices of the rocker frame 70 (Figure 8) can engage. The attachment of the first crushing jaw 61 to the rocker frame 70 should be possible as in the prior art, if possible without significant changes, so that as few modifications as possible need to be made to the rocker frame 70.

In order to support the crushing jaw segments 72a-72h laterally, in the exemplary embodiment shown here, the peripheral crushing jaw segments 72a and 72h each have a recess 84a, 84h, which function as a form-fitting element. Corresponding form-fitting elements 86a, 86b are provided on the rocker frame 70, which are designed here as projections (see Figure 8). The projections 86a, 86b serve to ensure that the crushing jaw segments 72 are fixed laterally and cannot move laterally during operation.

Even if only one crushing jaw 61 has been described above, it should be understood that the other crushing jaws 62, 63, 64, 65 can also be designed to be segmented. The terms first, second, third, fourth, etc. crushing jaw are also not limited to their position, so that the first crushing jaw 61 does not necessarily have to be the lowest of the rocker 8, but could also be the top or another one. In this respect, the term “first crushing jaw 61 ” is only to be understood generically. Even if the above exemplary embodiment was only described in relation to an eccentric roll crusher, it should be understood that a similar embodiment is also conceivable and preferred for other types of crushers, in particular a jaw crusher.

List of reference symbols (part of the description)

1 crusher, eccentric roll crusher

2 machine frame

4 second working unit, roll

5 axis of rotation of the roll

6 rocker axle

7 screening chamber

8 first working unit, rocker

9 crushing chamber

10 rocker adjustment device

12 rocker wedge

13 contact surface on rocker rear side

14 abutment

15 counter surface

16 rocker wedge drive

17 rocker counter element

18 hydraulic or pneumatic drive

19 hydraulic or pneumatic cylinder

20 hydraulic or pneumatic piston

22 rocker overload protection 23 pressure relief valve

40 screening device

42 stationary abutment

44 guide element

50 crushing jaw set

52 first crushing jaw unit

54 second crushing jaw unit

61 first crushing jaw

62 second crushing jaw

63 third crushing jaw

64 fourth crushing jaw

65 guide element crushing jaw

70 rocker frame

72 first crushing jaw segment

74 mounting rod

76 through opening

78a, 78b handling elements

80 surface

81-83 contact projections

84a, 84h form-fitting elements, recesses

86a, 86b form-fitting elements, projections

BS crushing gap

BE1 first jaw parting plane

BE2 second jaw parting plane

B short side of the crushing jaw segment

L long side of the crushing jaw segment SE segment parting plane

Claims

1 . Crushing jaw set (50) for a crusher (1), comprising a first crushing jaw unit (52) for a first working unit (8) of the crusher (1), and a second crushing jaw unit (54) for a second working unit (4) of the crusher (1), wherein between the first and the second working unit (8, 4) a crushing chamber (9) is defined, wherein the first crushing jaw unit (52) comprises at least a first crushing jaw (61) and a second crushing jaw (62), and the second crushing jaw unit (54) comprises at least one third crushing jaw (63), wherein the first and second crushing jaws (61 , 62) are separated at a first jaw dividing plane (BE1) which is oriented transversely to a material flow direction of the crusher (1), characterized in that at least the first crushing jaw (61) is formed from two or more first crushing jaw segments (72a-72h), each of which is separated at a segment parting plane (SE) which is perpendicular to the first (BE1).

2. Crushing jaw set according to claim 1 , wherein the first crushing jaw (61) is formed from at least three crushing jaw segments (72a-72h).

3. Crushing jaw set according to claim 1 or 2, wherein the first crushing jaw segments (72a- 72h) have a cuboid basic shape, and wherein a ratio of the longest side (L) to the shortest side (B) is in a range from 1 :2 to 1 :10.

4. Crushing jaw set according to any one of the preceding claims, wherein at least one of the crushing jaw segments (72a-72h) is formed from a first material and at least one of the crushing jaw segments (72a-72h) is formed from a second material which is different from the first material.

5. Crushing jaw set according to claim 4, wherein one or more crushing jaw segments (72a- 72h) in a central region are formed of a more wear-resistant material than crushing jaw segments (72a-72h) in an edge region.

6. Crushing jaw set according to any one of the preceding claims, wherein the first crushing jaw segments (72a-72h) each have a through opening (76) for receiving a mounting rod (74), wherein the through openings (76) are aligned with one another when the first crushing jaw segments (72a-72h) are in a mounted state.

7. Crushing jaw set according to any one of the preceding claims, wherein two or more of the first crushing jaw segments (72a-72h) have at least one lateral contact projection (81-83) with a contact surface for mutual contact and abutment of adjacent crushing jaw segments (72a-72h).

8. Crushing jaw set according to claim 7, wherein the first crushing jaw segments (72a-72h) are designed as a casting, wherein the contact projection (81-83) is designed as a sprue and the contact surface is machined.

9. Crushing jaw set according to any one of the preceding claims, wherein at least the first crushing jaw segments (72a-72h) provided at the lateral ends of the first crushing jaw (61) are provided with form-fitting elements (84a, 84h) for laterally holding the first crushing jaw segments (72a-72h).

10. Crushing jaw set according to any one of the preceding claims, wherein the second and/or the third crushing jaw (62, 63) is formed from two or more second or third crushing jaw segments, each of which is separated at a segment parting plane (SE) which is perpendicular to the first jaw parting plane (BE1).

11 . Crusher (1) for comminuting rock, with a first working unit (8), which is equipped with a first crushing jaw unit (52), and a second working unit (4), which is equipped with a second crushing jaw unit (54), wherein between the first and the second working units (4, 8) a crushing chamber (9) is defined, wherein the first crushing jaw unit (52) comprises at least a first crushing jaw (61) and a second crushing jaw (62), and the second crushing jaw unit (54) comprises at least one third crushing jaw (63), wherein the first and second crushing jaws (61 , 62) are separated at a first jaw dividing plane (BE1) which is oriented transversely to a material flow direction of the crusher (1), characterized in that at least the first crushing jaw (61) is formed from two or more first crushing jaw segments (72a-72h), each of which is separated at a segment parting plane (SE) which is perpendicular to the first jaw parting plane (BE1).

12. Crusher according to claim 11 , wherein the second and/or the third crushing jaw (62, 63) is formed from two or more second or third crushing jaw segments, each of which is separated at a segment parting plane (SE) which is perpendicular to the first jaw parting plane (BE1).

13. Crusher according to claim 11 or 12, wherein the first working unit (8) is substantially stationary during operation of the crusher (1) and the second working unit (4) carries out an oscillating crushing movement during operation of the crusher (1).

14. Crusher according to claim 13, which is designed as an eccentric roll crusher and the first working unit is a rocker (8) and the second working unit is an eccentric roll (4).

15. Crusher according to claim 13, which is designed as a jaw crusher and the first working unit is a stationary support structure and the second working unit is a jaw crushing rocker.

16. Maintenance method for servicing a crusher (1) according to claim 11 , comprising:

- dismantling one or more of the first crushing jaw segments (72a-72h) of the crusher (1); - providing replacement crushing jaw segments to replace the dismantled first crushing jaw segments (72a-72h); and

- mounting the replacement crushing jaw segments.