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
  • B02C13/04—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters hinged to the rotor; Hammer mills
• • 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
• • 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
  • B02C13/26—Details
• • 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 invention is in the field of machine tools of the type of industrial mills and particularly, without restriction, shredders scrap.
• the invention is in fact an improvement of the existing crushers which allows a significant decrease in the operating cost of said grinders by allowing, among other things, a substantial saving of the material in which the protections of the rotors of said crushers are manufactured. This improvement also allows easier handling of interchangeable parts constituting said protections of said rotors.
• the current grinders in particular the scrap crushers, consist of an internal main casing (1) inside which a rotor (2) driven by an electric motor rotates. Said rotor is provided on its periphery with hammers (3) adapted to cooperate with the edge of an anvil (4) integral with the housing.
• the casing has an inner wall covered with strong armor plates (5).
• the material to be ground (7) is injected into the housing by an opening (6) generally located near the rotor.
• the material to be ground is conveyed to the mill by a conveyor belt which feeds the mill continuously.
• the material to be ground is driven by the rotation of the rotor, crushed by crushing between the hammers of the rotor and an anvil.
• the crushed material fragments are then dragged tangentially on the wall of the casing to the portion opposite to the feed opening to be projected in the upper part of the casing which comprises a grid (8) disposed above the rotor and whose the size of the mesh is defined to determine the grain size of the product output: only the crushed material fragments having reached the desired particle size, defined by the mesh size of the grid, can be ejected.
• Said rotors generally consist of a series of disks (up to 13 for example) mounted in parallel on one or more axes. It is on this set that are fixed hammers (in number depending on the size of the rotor and mill, 12 to 26 in general) that will allow the grinding of materials. But the hammers do not cover the entire edge of the discs constituting the rotor. It is therefore necessary to provide a shielding to protect the discs and especially their slice. This is achieved by adding a set of shielding blocks constituting a shield (in the general sense of the term) made integral with the rotor and positioned on its periphery. Due to the presence of this shield, the disks and their wafer are no longer in contact with the material to be ground. It is therefore understood that the shielding of the rotor consists of several parts (the protective blocks or "caps”) constituting an assembly. In this text these parts are called “protection block” or "shield block”.
• the invention is directed to said protective or shielding blocks.
• said protective blocks are monoblock pieces, in any material compatible with the function, advantageously made of steel, integral with the rotor each comprising a shielding plate in the form of a rectangular metal plate, of thickness given, shaping an arc of a circle along its greatest length and whose radius is identical to the outer radius of the rotor discs that it must protect, and a means of fixing said shielding plate to said rotor discs, said fastening means being immovably attached to said armor plate.
• Each protection block shielding plate and fixing means
• the shielding plate wears during the grinding of the materials in the mill. It is therefore regularly necessary to replace them.
• the entire piece that is to say, complete protection block that must be replaced once the shielding portion worn. It is therefore clear that it is the whole of the protection block which is put to the rebus, while a large part of said part, mainly that constituting the means of attachment to the rotor, is intact.
• the invention seeks to make it more economical and easier to handle said protection blocks.
• protection blocks comprising two separate parts, a shielding plate and a means for fixing said shielding plate to said rotor discs, these two pieces being only when they are used.
• the shielding plate is the part that is in contact with the material to be ground, and is therefore damaged during the use of the mill.
• the fixing means meanwhile, not in contact with the material to be ground, is little damaged, and can be reused after being detached from the damaged armor plate, and can then be attached to a new plate of shielding.
• said protective blocks are no longer one-piece parts.
• the subject of the invention is a protective block for a material mill rotor, particularly scrap mill rotors, comprising
• a first shielding part or plate comprising itself, secured in a removable or irremovable manner on its internal face, a first fastening means, and
• said first fixing means is intended to secure said armor plate to the second fixing means which itself aims to secure said armor plate to the rotor of the mill.
• said shielding plate may be, in its orthogonal projection, of any form compatible with its function, preferably that of a parallelogram such as a rectangle, a square, a rhombus.
• the armor plate may be of rectangular shape.
• the shielding plate may have, in its lateral projection, any form compatible with its function, particularly compatible with the shape of the rotor that it must protect.
• the armor plate will have, along its greatest length, the shape of an arc whose radius is identical to the outer radius of the rotor discs that it must protect.
• the shielding plate may have any thickness compatible with its function. The skilled person will easily adapt said thickness to his needs.
• the shielding plate may have a thickness of between 10 mm and 100 mm, preferably between 40 mm and 60 mm.
• the first and second fixing means can take any form compatible with their functions.
• said first fixing means may be in four separate parts, positioned in pairs so as to be secured in a removable or irremovable manner to said shielding plate to one and the other ends of it.
• two of said parts may be positioned parallel to each other along the longitudinal axis of said armor plate, so that they can arrange between them a sufficient space for receiving said second fixing means.
• each of said pieces forming said first fixing means may have any form compatible with its function.
• these parts can take a form substantially equal to that of a right triangle whose hypotenuse may have a curvature allowing its adaptation to the curvature of the inner face of said armor plate.
• these parts may optionally also be of substantially square or rectangular shape, provided that one of their sides has a curvature allowing its adaptation to the curvature of the inner face of said armor plate.
• each of said parts will comprise at least one orifice intended to be positioned in line with an identical orifice formed in said second fixing means and intended to receive an axis capable of securing the armor plate assembly-second means of fixation.
• the shielding plate-first fixing means assembly may constitute one and the same molded part of a block or one and the same part, the parts forming the first fastening means. being weldable on the inner face of said shielding plate.
• the parts forming said first fastening means can be fixed to the armor plate reversibly by any appropriate means, such as screwing, bolting, interlocking or slide mounting.
• the parts forming said first fixing means can be fixed irreversibly to the shielding plate, for example by means of welds.
• the armor plate and the parts forming said first fastening means are molded (forged) in one piece, which has the advantage of ensuring better resistance of the assembly to shocks produced during grinding. .
• the parts forming the first fixing means may be of any material compatible with their function, advantageously these parts will be in the same material as the armor plate.
• each of the parts of the first fixing means and the second fixing means may have an identical thickness corresponding to one third of the dimension of the space between two rotor disks.
• the second fixing means can take any form compatible with its function, provided that on the one hand it can be secured to said armor plate and on the other hand it can be secured to said rotor.
• the second fastening means will have in lateral view substantially in the shape of a diamond having in its widest part a first orifice piercing perpendicularly through it, said first orifice to receive an axis for securing said second fastening means. said disks of said mill rotor.
• said second fixing means must also be able to be secured to said shielding plate, it may furthermore comprise at each of these ends at least a second orifice piercing it perpendicularly from one side to the other, said second orifice having to receive an axis allowing the securing of said second fastening means to said shielding plate through said second fastening means.
• the skilled person will easily adapt the diameter of each of the orifices as a function of the diameter of the axes he wishes to use, the diameter of said axes to be sufficient to have sufficient strength.
• said second fixing means may be configured in thickness so that it can, on the one hand, be inserted between two disks of the rotor of the mill, its thickness, at least over a part of its length, in front of therefore be compatible with the dimensions of the interior space separating two rotor discs so that the lateral play of said fastening means between the two discs is minimal.
• said second fastening means must be able to receive, at each of its ends, the first fastening means to secure the armor plate to the second fastening means.
• said second fixing means at each of its ends said second fixing means will have a thickness at most equal to the space provided between the two parts forming the first fastening means.
• said second fixing means may have in its middle part, around said first orifice, a thickness substantially equal to the distance between two rotor disks between which it must come to be inserted and at these ends a thickness less so as to provide sufficient space between itself and the rotor discs so that said first fastening means can also be inserted between the two discs of the rotor.
• the thickness of said second fastening means at these ends may be one-third of the size of the space between two disks.
• each of the parts of the first fixing means and the second fixing means may have an identical thickness corresponding to one-third of the dimension of the space between two disks of said rotor between which they must fit.
• said first fixing means and said second fixing means may have a configuration that is the opposite of that of the first embodiment.
• the shielding plate may bear only a first fixing means formed of two parts, advantageously identical to those forming the first fixing means described in the first embodiment of the invention, each of which may be positioned at one end of the inner face of the shielding plate and the second fixing means may be formed by the combination of two parts, advantageously identical to those forming the second fixing means described in the first embodiment of the invention, so that positioned parallel to each other these two parts will provide a space between it to receive the parts forming the first fixing means.
• the two parts forming said second fixing means can be joined in their middle by a spacer fixing the dimension of the space between said two parts.
• This spacer may or may not be immovably attached to said two parts. It is also possible to envisage that the spacer is secured in an irremovable manner only one of the two parts.
• the second fastening means may be formed of a single single piece, or two separate pieces or three separate pieces.
• the second fixing means when the spacer is immovably secured to the two parts then the second fixing means may be a single molded piece or welded, and when the spacer is immovably attached to one of the two pieces then this set can be a single piece molded or welded.
• the parts forming the first and the second fixing means may be the same as those forming the first and the second fastening means of the first embodiment of the invention, it being understood that when there were two pairs of pieces to form the first fastening means in the first embodiment, there are only two pieces in the second embodiment of the invention and when there was only a piece for forming the second fastening means in the first embodiment, there are two in the second embodiment of the invention.
• the shielding plate through the first fastening means and the second fixing means can be secured by means of axes positioned perpendicularly to said first and second means in the orifices arranged for this purpose in said fixing means.
• the shielding plate assembly and second fixing means may be secured to the rotor by means of an axis traversing perpendicularly said parts forming said second fixing means in the orifice formed in this respect at its center.
• the armor plate and the second fixing means can be secured by means of a simple set of tenon / mortise.
• the shielding plate can have on its inner face at least one mortise, of any possible shape, and for the second fastening means to have on its edge coming into contact with the shielding plate at least one complementary profile tenon. profile of the said mortise.
• said mortise and said pin will be configured at the time of manufacture of said parts, for example during the molding thereof.
• the assembly of the shielding plate and the second fixing means can be done by simply sliding one piece on the other so that the pin takes its place in the mortise.
• said shielding plate, the first and the second fixing means may be made of any material suitable for the purpose for which they are intended. According to the invention, they can be made in the same material or in different materials. Advantageously, these parts will be in the same material.
• said shielding plate, the first and second fixing means may be made of manganese or chromium-vanadium steel or HARDOX® type abrasion-resistant welded steel (Swedish Steel, Sweden), CREUSABO® or equivalent (ARCELOR, France).
• the orifices intended to receive the pins can take any known form. They can be circular, square, rectangular, triangular, or elliptical. Preferably, the orifices have a circular shape. According to the invention, the dimensions of said orifices are defined by the size of the pins or pins that will be used. The skilled person can easily adapt said dimensions to the object he wishes to obtain.
• the subject of the invention is also a protection shield for a material mill rotor, preferably for scrap mills, comprising at least one protection block according to the invention.
• the invention also relates to the use of at least one protection block according to the invention for making a protective shield for a material mill rotor, preferably scrap mills.
• the invention can be adapted to any existing mill rotor they can have varying dimensions. It is therefore understood that depending on the rotor dimensions, the number of protection blocks may be variable and said blocks can take all the desired dimensions. Those skilled in the art will easily adapt the number and dimensions of said blocks to the dimensions of the rotor that it uses.
• the invention also relates to a material crusher, particularly a scrap mill, comprising a protective armor of the rotor comprising at least one protection block according to the invention.
• the invention relates to a material crusher, particularly a scrap crusher, comprising an internal main casing, at least one rotor, hammers on said rotor, at least one anvil, a closed crankcase and covered with armor plates. resistant, a feed opening, an ejection grid disposed above the rotor and an ejection door, said rotor having protective blocks as described above.
• the grinder of material according to the invention is a grinder as described in the European patent application EP2012924.
• - Figure (1) shows a cross section of a conventional scrap mill
• - Figure (2) shows a three-dimensional view of a first embodiment of a protection block according to the invention, with 2a an exploded view of the two parts forming the block;
• FIG. (3) shows a three-dimensional view of a second embodiment of a protection block according to the invention, with 3a an exploded view of the two parts forming the block;
• FIG. 4 shows a side view of a third embodiment of a protection block according to the invention.
• FIG. (1) shows a cross-section of a conventional scrap mill, in which are represented the inner main casing 1, the rotor 2, the hammers 3, the anvil 4, the closed bottom of the casing and covered with plates of 5, the supply opening 6, the material to be ground 7, the grid 8 disposed above the rotor and the ejection door 9.
• FIG. 2 represents a three-dimensional view of a protection block according to the first embodiment of the invention with an exploded view of said protection block in 2a and a view of the same mounted protection block in FIG. 2.1 shows said protective block, with 2.2 the shielding plate, 2.3 the parts forming the first fixing means, and 2.4 the second fixing means.
• the axis (or pin) which through the orifices 2.6 will allow the reversible connection of the armor plate and the second fixing means.
• the orifice 2.7 which allows using a pin or pin not shown to secure the protective block to the rotor of the mill.
• the parts of the first fastening means 2.3 are irreversibly secured to the shielding plate 2.2 by means of welds 2.8.
• FIG. 3 represents a three-dimensional view of a protection block according to the second embodiment of the invention with an exploded view of said protection block and a view of the same protective block mounted on it.
• This FIG. 3 shows the protective block, with the shielding plate 3.2, the parts forming the first fastening means 3.3, and the parts forming the second fastening means.
• the axis (or pin) which through the orifices 3.6 will allow solidarity reversible armor plate and the second attachment means.
• the orifice 3.7 which allows using a pin or pin not shown to secure the protective block to the rotor of the mill.
• the parts of the first fastening means 3.3 are irreversibly secured to the shielding plate 3.2 by means of welds 3.8.
• FIG. 4 shows a side view of a protection block according to the third embodiment of the invention with 4.1 said protective block, 4.2 the shielding plate and 4.4 the second fixing means.
• the armor plate carries at each of its ends a tenon 4.10 and that the second fixing means carries, at the right of said tenons, a mortise 4.11 to the dimensions of said tenons.
• the orifice 4.7 which allows using a pin or pin not shown to secure the protective block to the rotor of the mill.

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

Applications Claiming Priority (2)

Publications (1)

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• 2010
  • 2010-02-05 FR FR1000458A patent/FR2956042A1/fr not_active Withdrawn
• 2011
  • 2011-02-03 EP EP11708528A patent/EP2531301A1/de not_active Withdrawn
  • 2011-02-03 US US13/577,376 patent/US20130037640A1/en not_active Abandoned
  • 2011-02-03 JP JP2012551661A patent/JP2013518709A/ja not_active Withdrawn
  • 2011-02-03 WO PCT/FR2011/000068 patent/WO2011095710A1/fr not_active Ceased

Non-Patent Citations (1)

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