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
  • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
  • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
  • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
  • B02C13/1814—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed on top of a disc type 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
  • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
  • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
  • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
  • B02C2013/1857—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate rotating coaxially around the rotor shaft
• • 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
  • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
  • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
  • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
  • B02C2013/1871—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate vertically adjustable

Definitions

• the invention relates to an impact crusher with a plate-shaped rotor rotatably mounted about a vertical axis and a housing surrounding the latter with a wall forming an impact surface, against the inside of which, with the rotor rotating, heaped material is thrown for the purpose of comminution.
• a baffle crusher of the above type is known from the journal AUFBEREITUNGSTECHNIK 1993, p. 274, in which the wall of the housing forming the baffle surface and lined with baffle plates is oriented parallel to the axis of rotation of the rotor.
• the material that reaches the rotor in this impact crusher via a filling funnel is thrown against the impact surface with great force under centrifugal force and, upon impact, is broken along internal microcracks or other irregularities in the structure, in order to subsequently fall freely, where it or the like from a conveyor belt. is recorded.
• an impact crusher with a frustoconical rotor is finally known, the upper end of which is covered by a stationary frustoconical hood, through which the material is transferred into an annular gap, which is also ke from the outer wall of the rotor and one surrounding it ⁇ truncated but stationary housing wall is formed.
• blow bars are arranged both on the stationary outer wall formed by the housing and on the circumferential inner wall of the annular gap formed by the rotor.
• This known crusher is also not fully satisfactory insofar as the particles of the broken or ground material have extremely uneven movement paths and there are undesirably high levels of collision between good parts.
• the invention has for its object to provide an impact crusher of the type mentioned first, in which a largely and also uniform comminution of the material to be crushed is achieved with a comparatively low power required to drive the rotor.
• This object is achieved according to the invention in that the inner side of the wall of the housing forming the baffle surface is designed essentially in the manner of the shell of at least one truncated cone which widens downward, that at least one insert is arranged below the rotor, the insert
• the outside is also essentially designed in the manner of a truncated cone that widens downward and that the inside of the wall of the housing and the outside of the insert, which does not perform any relative movement with respect to it, form two baffles between them that delimit an annular gap for multiple comminution of the material.
• the impact crusher according to the invention has the advantage that it is very powerful with a simple structure and that the energy still present in the material to be crushed after the impact on the first impact surface is used for further comminution processes and a very favorable comminution result is achieved in this way, whereby there are practically none increasing the energy requirement due to internal friction and the dust development-promoting collisions between crushed material particles with intersecting trajectories, the crushed material passes through largely determined paths from the task to the crop receiving surface of the rotor until it leaves the crusher.
• FIG. 3 shows a highly schematic view of the essential parts of the impact crusher according to FIG. 1 with a concave good receiving surface of the rotor in a first operating position
• FIG. 4 is a highly schematic view of the essential parts of an impact crusher according to FIG. 1 with a flat receiving surface of the rotor in a second operating position
• FIG. 5 highly schematized the essential parts of an impact crusher according to FIG. 1 with a convex receiving surface of the rotor in a third operating position
• 6 shows a highly schematic view of the essential parts of an impact crusher according to FIG. 1 with a tapering annular space between the impact surfaces in an operating position corresponding to FIG. 4,
• FIG. 7 shows a plan view corresponding to the plan view according to FIG. 2 of an impact crusher with a modified housing and a modified insert
• FIG. 8 shows a top view corresponding to the top view according to FIG. 2 of an impact crusher equipped with baffle plates according to FIGS. 1 and 2 and
• FIG 9 shows a section through a further impact crusher, in which the impact material is comminuted into an annular space with a stationary and a rotating insert.
• FIG. 1 is a frame for a housing of an impact crusher consisting of a wall 2 and a cover 3.
• a plate-shaped rotor 7 is fastened on a shaft 6, which can be driven by a motor 5 via a V-belt 4, on the receiving surface 8 of which guide elements 9, often referred to as prallei, are guided for the guide elements 9 by a funnel 10 in the cover 3 pourable goods are arranged.
• a fixed insert 11 which is designed in the manner of a stationary apron which extends downward from the edge of the rotor 7.
• the outside 12 of the insert, together with the inside 13 of the wall, defines an annular gap 14, the the good to be crushed happens.
• Both the wall 2 and the insert 11 essentially have the shape of truncated cones, the generatrix of which forms an angle cc of 60 'to 85' with respect to the longitudinal axis 15 of the shaft 6 (cf. FIG. 3).
• FIGS. 3 to 5 show three different positions of the wall 2 in relation to the cover 3, the annular gap 14 being the smallest in FIG. 3 and the largest in FIG. 5. It is also indicated in FIGS. 3 to 5 that the crop receiving surfaces 8 of the rotor 7 can have different shapes. While in FIG. 4, as in FIG. 1, a flat crop receiving surface 8 is shown, FIG. 3 shows a rotor 7 with a concave crop receiving surface 19 and FIG. 5 shows a rotor 7 with a convex crop receiving surface 20.
• annular gap 21 with a decreasing cross section can also be used, as is shown in FIG. 6.
• FIGS. 2 to 6 show that the material 22 to be broken, after hitting the rotor 7, is first thrown radially outwards against the sloping inside 13 of the wall 2 at high speed which it encounters at an angle of about 90 'when viewed in the spin plane. Due to the inclination of the wall 2 to the longitudinal axis 15 of the shaft 6, the material 22 rebounds obliquely downward in order to then close the respective annular gap 14 on an essentially zigzag-shaped path 23 indicated in FIGS. 3 to 5 or 21 to pass.
• the design of the wall 2 and the insert 11 and the resulting shape of the annular gap 14 or 21 reduce energy-consuming collisions between crushed material which is thrown outwards by the rotor 7 and bounces back from the inside 13 of the wall 2 and in this way suppress to a large extent losses caused by "internal friction" during the breaking process, at the same time a more intensive comminution of the material to be broken is achieved as a result of better use of energy.
• FIGS. 1 and 2 the outer wall 2 and the wall of the insert 11 have exactly the shape of truncated cones which are produced by bending sheet metal strips corresponding to the shells of the truncated cones.
• FIG. 7 shows a wall 2 which, like the part of the insert 11 which defines an annular gap 14 with it, consists of trapezoidal segments 24 and 25 which are connected to one another by welding in the region of their longitudinal sides. In all cases, the opposite surfaces of the wall 2 and the insert 11 are clad with wear-resistant baffle plates 26.
• FIG. 8 shows that with a solution according to FIG. 2 there is the possibility of arranging baffle plates 26 at an angle to wall 2.
• FIG. 9 schematically shows an impact crusher which is similar in basic structure to the impact crusher according to FIGS. 1 and 2.
• the same reference numerals were used for FIG. 9 as in FIG. 1.
• the crushed material in the impact crusher according to FIG. 9 is, as it were, in two stages by placing a further insert 27 below the insert 11 is.
• Rotational movements can be introduced into the insert 27, which expediently take place in the opposite direction to the rotary movement of the rotor 7.
• Due to the eccentric mounting of the insert 27 on a bushing 28 oversize particles of the comminuted material are subsequently subjected to a crushing operation and are thus comminuted.
• Due to the height-adjustable design of the wall 29 of the second stage enclosing the further insert 27, the annular space thereof can also be adapted to different circumstances.

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

Applications Claiming Priority (3)

Publications (2)

Family

ID=6490329

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (7)

Family Cites Families (7)

• 1993
  • 1993-06-10 DE DE4319702A patent/DE4319702C2/de not_active Expired - Fee Related
• 1994
  • 1994-06-08 WO PCT/EP1994/001867 patent/WO1994029027A1/fr not_active Ceased
  • 1994-06-08 AU AU71230/94A patent/AU7123094A/en not_active Abandoned
  • 1994-06-08 DE DE59401835T patent/DE59401835D1/de not_active Expired - Fee Related
  • 1994-06-08 EP EP94920436A patent/EP0702598B1/fr not_active Expired - Lifetime
  • 1994-06-08 AT AT94920436T patent/ATE149000T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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