WO2018072847A1 - Système pour plaque de broyage supérieure et inférieure échangeable - Google Patents

Système pour plaque de broyage supérieure et inférieure échangeable Download PDF

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Publication number
WO2018072847A1
WO2018072847A1 PCT/EP2016/075408 EP2016075408W WO2018072847A1 WO 2018072847 A1 WO2018072847 A1 WO 2018072847A1 EP 2016075408 W EP2016075408 W EP 2016075408W WO 2018072847 A1 WO2018072847 A1 WO 2018072847A1
Authority
WO
WIPO (PCT)
Prior art keywords
support surface
crushing plate
receiving structure
plate assembly
frontal
Prior art date
Application number
PCT/EP2016/075408
Other languages
English (en)
Inventor
Martin Hassler
Thomas Retzmann
Original Assignee
Metso Germany Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Germany Gmbh filed Critical Metso Germany Gmbh
Priority to PCT/EP2016/075408 priority Critical patent/WO2018072847A1/fr
Publication of WO2018072847A1 publication Critical patent/WO2018072847A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the present invention relates to an exchangeable crushing plate in a hammer crusher.
  • the crushing plate is slideably mounted in a receiving structure in a hammer crusher and sits fixed by its own weight.
  • the present invention relates to an exchangeable crushing plate in a hammer crusher.
  • the crushing plate is slideably mounted in a receiving structure in a hammer crusher and sits fixed by its own weight.
  • invention relates to a receiving structure in a hammer crusher for receiving a crushing plate assembly, and a corresponding crushing plate assembly and hammer crusher.
  • a hammer crusher generally comprises a steel drum or inner housing that contains a rotating shaft on which hammers are mounted.
  • the hammers are either mounted in a way that permits a free swinging or are fixedly mounted on the central rotor.
  • the rotor is spun at high speed inside the housing and material to be shredded is fed into said housing.
  • a hammer crusher usually further comprises a screen or grate located in proximity to the rotor.
  • the crushing or milling will be performed by the impact of the hammers onto the material to be shredded.
  • the size of the shredded material usually depends on the coarseness of the grate.
  • coarseness of the grate in this case does not mean the coarseness of the surface, but the dimensions of the holes within the grate.
  • Another source of crushing is the so-called crushing plates or front walls which the material which is to be shredded is usually accelerated onto by the hammers of the rotor.
  • the material will either contact the grate or the crushing plate first. If the feeder is located above the rotor the fed material will be directly accelerated by the hammers and will impact on the crushing plate first which will lead to a breakage of the fed material due to the impact on the crushing plate. Further downstream of the crushing plate is the grate to which the crushed material will be pushed by the hammers after it has been broken into smaller pieces due to the impact on the crushing plate described above.
  • the feeder In another type of hammer crusher the feeder is located at one side for example the front side and the material will come in contact with the hammers and the grate before it comes into contact with a crushing plate. Therefore only material that is not crushed the first time it passes through the space between the rotor and the grate will come in contact with the crushing plate/front wall and will after impact with the crushing plate be fed downwards to the grate again to be further shredded just as in the example above.
  • Hammer crushers may comprise a second grate which is coarser than the first grate in order to remove parts that cannot be shredded further.
  • Both types of hammer crushers are usually lined with heavy metal plates which are similar to the crushing plate but are located perpendicularly to the main impact surfaces in order to protect the casing of the hammer crusher from debris that is accelerated by the hammers connected to the rotor.
  • the crushing plate or front plate exhibits more wear than the lining on the sides because the material will be accelerated towards that surface during the crushing process as one source of crushing.
  • the lined sides of the case are usually parallel to the direction in which the material is
  • the front wall Because the impact with the front wall is one of the main sources of crushing, the front wall needs to be regularly replaced.
  • one screw of the wear part is unscrewed and a metal rope is fed through the screw hole to secure the wear part in its position so it does not fall down, slide away or swing.
  • the other screws are loosened and taken out and the wear part can be taken out by a lifting device such as a crane to which the wire rope is connected.
  • a new wear part which is connected to a steel cable is brought inside the hammer crusher with the lifting device and is connected via two screws or other fixing means so that it cannot fall down or tilt. After that, the wire rope is taken out and the wear part will be entirely connected.
  • Another method of exchanging the wear parts of the crushing plate or front wall is to use a front wall structure or crushing plate structure to which the wear parts are
  • an object of the present invention to provide a system which allows for a safer and faster way to exchange the wear parts of a crushing plate or front wall in a hammer crusher, without losing stability or strength of the hammer crusher casing.
  • a receiving structure in a hammer crusher for receiving a crushing plate assembly comprises at least one frontal support surface; and at least a rear support surface.
  • the two surfaces are angled towards one another (e.g. the frontal support surface is angled towards the rear support surface) so that the two support surfaces fixedly hold the crushing plate assembly by means of gravity.
  • This receiving structure allows sliding in of a crushing plate assembly which will sit in its predetermined position predominantly by gravity, or even by gravity only so that it does not require further elements of fixing or fasteners like screws or bolts or similar locking devices, as does the crushing plate assembly of the prior art which is connected by screws. Further, as described above with respect to one known configuration, the crushing plate assembly of the prior art may form part of the casing itself. In this case, another advantage of the receiving structure according to the present invention is that the casing of the hammer crusher is not weakened as compared to a configuration in which the
  • the term "sit" in connection with the crushing plate assembly' s predetermined position means that the crushing plate assembly can only be moved by a lifting structure and not by material that impacts the wear parts at the time of crushing, i.e. in use.
  • the normal vectors of the frontal support surface and the rear support surface lie in parallel planes.
  • the frontal support surface and the rear support surface can be idealized as planes which can respectively be defined by two linearly independent unit vectors, wherein one of the two unit vectors of one of the planes is parallel to one of the two unit vectors of the other one of the planes.
  • a lower support surface is further preferably provided in the receiving structure which is located at one end of the rear support surface where the frontal support surface is closer to the rear support surface than at an opposite end of the rear support surface.
  • the weight of the crushing plate assembly can be more reliably distributed, and a more stable configuration can be achieved.
  • a normal vector of the lower support surface is in a parallel plane to the planes of the normal vectors of the frontal support surface and the rear support surface and the lower support surface is in contact with the rear support surface.
  • the receiving structure can preferably be provided with an upper end of the frontal support surface being higher than an upper end of the rear support surface and/or a lower end of the frontal support surface being higher than a lower end of the rear support surface.
  • crushing plate assembly especially when the crushing plate assembly is made of two parts, is simplified because the crushing plate assembly will get in contact with only one of the at least two support surfaces more easily and can slide more easily accordingly as the opening of the upper end is increased .
  • At least one, preferably all, of the support surfaces are connected or integrated with a side wall of the hammer crusher.
  • the support surfaces have to be mounted to the side walls, or the side walls have to be replaced.
  • the lower support surface and/or the rear support surface can preferably span between the side walls of the hammer crusher.
  • the two side walls which are part of the casing of the hammer crusher can be strengthened, and stability of the casing can be further advanced .
  • the support surfaces can advantageously be flush with a lining or one or more side walls of the hammer crusher outside of the receiving structure.
  • the lining By being arranged so that the lining is flush with the support surfaces, it is possible for the lining to protect the receiving structure from any impact by material during the crushing process. This ensures that the receiving
  • the invention further relates to a crushing plate assembly.
  • the crushing plate assembly comprises support portions.
  • the support portions are formed on two opposing sides of the crushing plate assembly. Between the two support portions a plate is provided which is configured to allow wear parts to be mounted on said plate to form a crushing plate.
  • the support portions are formed in a way that they are receivable by the receiving structure and at least held in two directions by said receiving structure.
  • a crushing plate assembly as described above can be taken out of the receiving structure of the hammer crusher and be replaced by a new crushing plate assembly with the wear parts mounted thereon. This allows for a quick maintenance of the hammer crusher, and minimizing of a machine downtime. Further, the crushing plate assembly can be refurbished by exchanging the wear parts outside the hammer crusher which makes it safer and easier to exchange the wear parts on the one hand, and on the other hand the time necessary for changing the wear parts does not correspond to a downtime of the hammer crusher because the hammer crusher can be used with a second crushing plate assembly while the first one is being maintained.
  • the crushing plate assembly can preferably be made out of at least two crushing plate subassemblies, a first crushing plate subassembly and a second crushing plate subassembly.
  • crushing plate assembly is simplified because the weight of each crushing plate subassembly is lower than the weight of one bigger crushing plate assembly. This does not only lower the requirements for a lifting device regarding its maximum power and lift, but also makes handling of the crushing plate easier after it has been taken out of the hammer crusher. Further, it becomes possible to angle the two crushing plate subassemblies and especially the wear parts on the two crushing plate subassemblies differently so that an optimized crushing result can be achieved by having a crushing plate that comprises a form that at least to a certain degree follows the shape of the rotor.
  • the crushing plate assembly can preferably be formed in such a way that, when mounted in a hammer crusher, in particular as described above, the second crushing plate subassembly rests on the first crushing plate subassembly. Further preferably, the first crushing plate subassembly is held in place by the rear support surface, the lower support surface, and the second crushing plate subassembly and/or the frontal support surface.
  • the wear parts of the crushing plate subassemblies can further preferably be angled towards one another. By angling the wear parts on the surface of the crushing plate
  • the crushing plate assembly may further preferably comprise at least one reinforcement structure between the support portions to reinforce the plate which is configured to allow the wear parts to be mounted thereon.
  • at least one reinforcement structure By providing at least one reinforcement structure, said plate becomes more stable and the crushing plate assembly itself is less prone to distortion. Further an impact force that is transferred from the wear parts to the plate which has the wear parts
  • the invention further relates to a hammer crusher with a receiving structure described above and/or the crushing plate assembly also described above.
  • Figure la shows a sectional view of a crushing plate assembly and a receiving structure in accordance with a first
  • Figure lb illustrates a sectional view of a receiving
  • Figure 2 depicts a sectional view of the crushing plate assembly inserted into the receiving structure of figure la.
  • Figure 3 shows the crushing plate assembly inserted into the receiving structure of figures la and 2 in a top sectional view .
  • Figure la shows a sectional side view of a part of a hammer crusher casing and two crushing plate subassemblies 100, 200 which complement to a crushing plate assembly.
  • the upper one will be referred to as the upper crushing plate subassembly 100 or second crushing plate subassembly 100 and the lower one will be referred to as the lower crushing plate
  • first crushing plate subassembly 200 or first crushing plate subassembly 200.
  • the receiving structure will usually be formed on both side walls of the hammer crusher casing.
  • the inside of the hammer crusher is provided with a lining which is made out of casted metal parts.
  • the lining is divided into several lining segments 40.
  • Each lining segment 40 is connected to a side wall 60 of a hammer crusher casing by using nuts 91 and bolts 90.
  • the nuts 91 used to hold the lining segments 40 of the hammer crusher in place are not shown in figure la, but in figure 3, as they are disposed on the opposite side of the side wall 60.
  • a first frontal support surface 10 is flush with the lining segments 40, is formed as a surface of a ridge and is offset to an area 50 of the side wall 60 which is clear of lining segments 40.
  • a rear support surface 20 is disposed also next to the area 50, is formed as the surface of a plate, and the rear support surface 20 and the frontal support surface 10 are, in a plane of the side wall 60 as seen in figure la and lb, angled towards each other thereby forming a portion of a wedge.
  • a lower support surface 30 is provided as a surface of a further plate which is located at a lower end of the rear support surface 20 and extends towards an, in the embodiment of figure la imaginary, extension of the frontal support surface 10.
  • an upper end of the frontal support surface 10 is at a higher position than an upper end of the rear support surface 20, and a lower end of the frontal support surface 10 is at a higher position than a lower end of the rear support surface 20, as seen in the side view of figure la.
  • the frontal support surface 10 can be configured as a two-part element, for example as surfaces of two ridges on each side wall 60, having an upper part 11 and a lower part 12, wherein the upper part 11 corresponds in its shape, size and position to the frontal support surface 10 of the first embodiment as illustrated in figure la.
  • the lower part 12 is offset with respect to the upper part 11 towards the rear support surface 20, and located below the upper part 11 of the frontal support surface 10.
  • the elements defining the support surfaces 10, 20 and 30 can be integrated with at least one of the side walls 60 of the hammer crusher.
  • the elements defining the support surfaces 10, 20 and 30 can be welded, screwed or otherwise connected to the side walls 60 of the hammer crusher, as long as the connection is strong enough to carry or support crushing plate subassemblies 100, 200.
  • this preferred embodiment comprises a lower support surface 30, the lower support surface 30 is entirely optional and the frontal support surface 10 and the rear support surface 20 can be formed so that the crushing plate assembly is held in place by the wedge shape in a side view of the two frontal support surface 10 and the rear support surface 20.
  • frontal support surface 10 does not have to be flush with the lining segments 40 but can be provided with its own lining or protective elements.
  • the receiving structure can be tilted so that the frontal support surface 10 will carry less weight of the crushing plate assembly and the rear support surface 20 will be formed so as to extend to a higher upper end, as in comparison to the embodiment illustrated in the figures, so that it carries more weight of the crushing plate assembly.
  • FIG. 2 shows the crushing plate assembly including two crushing plate subassemblies 100, 200 which are inserted into the receiving structure in the hammer crusher.
  • the lower crushing plate subassembly 200 rests on the rear support surface 20 and the lower support surface 30.
  • the lower crushing plate subassembly 200 comprises an upper metal plate 260 a lower metal plate 280 and a frontal metal plate 270 which constitutes a surface on which wear parts 210 are mounted .
  • the wear parts 210 are mounted to the frontal metal plate 270 of the lower crushing plate subassembly 200 by means of bolts 250 which are inserted into the wear parts 210, and on the opposing side of the frontal metal plate 270, nuts 240 are screwed on the bolts 250 in order to fix the wear parts 210 on the frontal metal plate 270.
  • the lower crushing plate subassembly 200 may comprise as a reinforcement structure a plurality of support plates 290 that are formed
  • the support plates 290 are surrounded by the lower metal plate 280 and the upper metal plate 270 so that the lower crushing plate subassembly 200 is, in this embodiment, open on its backside and will form multiple hollow spaces between the support plates 290, the frontal metal plate 270, the upper metal plate 260, the lower metal plate 280, and the rear support surface 20.
  • the lower crushing plate subassembly 200 When inserted into the receiving structure of the hammer crusher in accordance with the first embodiment illustrated in figure la, the lower crushing plate subassembly 200 is held in place by the rear support surface 20, the lower support surface 30, a lower metal plate 180 of the upper crushing plate subassembly 100, and a lower wear part 120 of the upper crushing plate subassembly 100.
  • the lower crushing plate subassembly 200 is held in place by the rear support surface 20, the lower support surface 30 and the lower part 12 of the frontal support surface 10, in addition to a support by the upper crushing plate subassembly 100.
  • the upper crushing plate subassembly 100 will be described in the following.
  • the upper crushing plate subassembly 100 comprises the lower metal plate 180, a frontal metal plate 170 on which wear parts 110, 120 are mounted and an upper metal plate 160.
  • crushing plate subassembly 100 are different depending on the position they are mounted on.
  • the wear parts 110, 120 are held onto the frontal metal plate 170 by bolts 150 which are tightened with nuts 140 on the opposing side of the frontal metal plate 170.
  • the upper crushing plate subassembly 100 rests with its support portions 195 as seen in figure 3 on the frontal support surfaces 10 and rear support surfaces 20.
  • the upper crushing plate subassembly 100 supports the lower crushing plate subassembly 200 with its lower metal plate 180.
  • the wear parts 120 of the upper crushing plate subassembly 100 are located in front of, i.e. towards the rotor of the hammer crusher with respect to, the wear parts 210 of the lower crushing plates subassembly 200 so that lower ends of the wear parts 120 are located
  • the upper crushing plate subassembly 100 comprises support plates 190 as a reinforcing structure similar to the support plates 290 of the lower crushing plate subassembly 200, which are mounted on the frontal metal plate 170 on the side opposite to where the wear parts 110, 120 are mounted to the frontal metal plate 170.
  • the support plates 190 are in contact with the rear support surface 20 of the receiving structure similar to the supports 290 of the lower
  • Hollow spaces between the support plates 190 and the frontal metal plate 170 can be covered by a cover which can be connected to the lower support surface 20 or the upper crushing plate assembly 100, e.g. by a hinged connection. By employing such a cover, it can be ensured that e.g. debris of the shredded material cannot accumulate in the spaces
  • wear parts 120 are separate parts over the width of the hammer crusher and are not formed as one part over the entire width, which is also true for the wear parts 110 and 210. This allows for a small handling weight of each wear part 110, 120 and 210, and facilitates changing the wear parts, when the crushing plate assembly is maintained.
  • Figure 3 shows the support plates 190 in a lower part of the upper crushing plate subassembly 100 and it is seen that the support plates 190 are in abutment with the frontal metal plate 170 and the rear support surface 20. This leads to a better transfer of the impact at a time of crushing from the wear parts 110, 120, and 210 to the receiving structure.
  • the area 50 of the side wall 60 is set back in comparison to the lining segments 40.
  • the lining segments 40 are screwed onto the side wall 60 of the casing of the hammer crusher and the ridge forming the frontal support surface 10 is also connected to the side wall 60 of a hammer crusher but has a smaller dimension in the width direction of the hammer crusher. It is shown that the ridge forming the frontal support surface 10 is protected by the lining segments 40 and the wear parts 120 against any impact of shredded material.
  • the support portion of the crushing plate assembly is formed by a metal plate 195 of the crushing plate assembly which is in abutment with the frontal support surface 10 and the rear support surface 20. In this embodiment it is also in abutment with the side wall 60 of the hammer crusher. Specifically, it is in contact with the area 50 of the receiving structure.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

La présente invention concerne une structure de réception dans un broyeur à marteaux, qui sert à recevoir un ensemble plaque de broyage, laquelle structure de réception comprend au moins une surface de support avant (10) et au moins une surface de support arrière (20). La surface de support avant (10) est inclinée vers la surface de support arrière (20) de façon à maintenir à demeure l'ensemble plaque de broyage par gravité. L'ensemble plaque de broyage comprend des parties de soutien (195), qui sont formées sur deux côtés opposés de l'ensemble plaque de broyage. Entre les parties de soutien (195) se trouve une plaque (170), qui est conçue pour permettre à des parties d'usure (110, 120, 210) d'être montées sur cette dernière pour former une plaque de broyage. Les parties de support (195) sont formées pour être reçues et maintenues à demeure dans au moins deux directions par la structure de réception.
PCT/EP2016/075408 2016-10-21 2016-10-21 Système pour plaque de broyage supérieure et inférieure échangeable WO2018072847A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/075408 WO2018072847A1 (fr) 2016-10-21 2016-10-21 Système pour plaque de broyage supérieure et inférieure échangeable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/075408 WO2018072847A1 (fr) 2016-10-21 2016-10-21 Système pour plaque de broyage supérieure et inférieure échangeable

Publications (1)

Publication Number Publication Date
WO2018072847A1 true WO2018072847A1 (fr) 2018-04-26

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR496402A (fr) * 1919-03-01 1919-11-06 Rene Charles Jacquart Perfectionnements aux grilles de broyeurs pour minerais, produits chimiques, etc.
DE958712C (de) * 1951-06-09 1957-02-21 Westfalia Dinnendahl Groeppel Lagerung fuer ausschwenkbar aufgehaengte Prallplatten in Schleudermuehlen
FR2525921A1 (fr) * 1982-04-29 1983-11-04 Krupp Gmbh Unite de grille pour concasseur a marteaux

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR496402A (fr) * 1919-03-01 1919-11-06 Rene Charles Jacquart Perfectionnements aux grilles de broyeurs pour minerais, produits chimiques, etc.
DE958712C (de) * 1951-06-09 1957-02-21 Westfalia Dinnendahl Groeppel Lagerung fuer ausschwenkbar aufgehaengte Prallplatten in Schleudermuehlen
FR2525921A1 (fr) * 1982-04-29 1983-11-04 Krupp Gmbh Unite de grille pour concasseur a marteaux

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