FR2525921A1 - GRID UNIT FOR HAMMER CRUSHER - Google Patents

Abstract

THE GRID UNIT FOR A HAMMER CRUSHER 5, COMPOSED OF GRID BARS AND GRID FLANGES RECEIVING THEM, THE BARS BEING HOUSED IN OPEN RECESSES PLACED ON THE UPPER EDGE OF THE PADDLES AND HELD BY ASSEMBLED LOCKING SECTORS A REMOVABLE WAY OF THE FLANGES WITH LOCKING OR FIXING ELEMENTS IS CHARACTERIZED IN THAT THE LOCKING OR FIXING ELEMENTS 49 - VIEW OF THE ROTOR - ARE COVERED BY THE SURFACE 63 OF THE LOCKING SECTORS 47 WHICH IS TURNED TOWARDS THE ROTOR.

Description

The invention relates to a grid unit for a hammer crusher,

  composed of grid bars and grid flanges receiving them, the bars being housed in open recesses placed on the upper edge of the flanges and held by locking sectors as-

  seemingly removable from the flanges with elements

blocking or fixing elements.

  Such crushers have a reduction ratio

  high tion They are made with one or two rotors and they constitute hammer crushers with single or double rotor Between the rotor and the impact wall (on a single rotor crusher) or between the rotor and the anvil (on

  double rotor crusher), the product is subjected to a frag-

  preliminary mentation But the main part of the subsequent fragmentation occurs between the hammers of the rotors and the bars of grids of the unit or grid units The bars and the flanges of grid which them

  receive wear a lot, which requires frequent removal

  quente of grid units for changing bars

  and for the remanufacturing of the grid flanges.

  French Patent 496,402 describes a grid unit, on which the grid bars are inserted, by their ends, in recesses open towards the

  high and arranged on the inner face of the side plates

  rails, the bars being held in the lateral flanges

  by blocking sectors or bent flat steel.

  The blocking sectors themselves are removably attached to the side flanges by means of slotted-head screws. At least to the extent that the blocking sectors are located in the crushing zone, they and the screws are subjected wear and tear that they can practically no longer

be changed.

  A similar construction is known by the bre-

  German vet 325 988, in which the openings open towards the rotor are made in its annular sectors

  "toothed" which are, in turn, screwed onto the flanges la-

the grid unit.

  The object of the invention is to create a unit of

  grid, in which the blocking sectors are assembled

  to the flanges of the grid, in a way which, even under

  the action of wear, be removable after a long time.

  This object is achieved according to the invention in that

  the locking or fixing elements seen from the rotor -

  are covered by the area of the blocking sectors which is

facing the rotor.

  Thanks to the covering of the blocking or fixing elements, the attack surface necessary for loosening the blocking sectors (for example the hexagon surface

  of a nut) is retained even after a period of operation-

quite long.

  The fixing elements are usefully composed of a threaded rod and a nut. The threaded rod can be a screw and, in particular, a hammer screw, of which

  the head can rest in a recess in the block area

  cage As the surface of the blocking sectors facing the rotor has no holes for the fastening elements, there is another advantage that the worn part of this surface can be completed by welding by reloading By placing surface parts on the blocking sectors, lateral fixing of the

grid bars.

  Various other features of the invention

  moreover emerge from the detailed description which follows.

  An embodiment of the object of the invention

  tion is shown, by way of nonlimiting example,

to the accompanying drawings.

  Fig 1 shows a side view of a me-

  third of a double rotor hammer crusher.

  Fig 2 shows a partial side view

an outer grille flange.

  Fig 3 shows a partial side view of a blocking piece for the outer flanges of the grid. Fig 4 shows a partial side view of an outer grille flange and the blocking part

  tight with him, including the grid bars.

  FIG. 5 represents a partial cross-section of an external flange of the grid and of the corresponding blocking piece, along the line V-V of the

fig 4.

  Fig 6 shows a partial side view of the inner grid flanges and the locking piece

  tight with them, including the grid bars.

  Fig 7 shows a partial cross section of the inner flanges of the grid as well as the locking piece tightened with them, along the line VII-VII

in fig 6.

  In the example of execution according to fig 1, it is a grid unit for a hammer crusher

  with double rotor, of which only half is represented.

  The other half of the crusher is symmetrical about

median 1.

  The hammer crusher presents, in a way

  common for the two halves, an anvil 2, an envelope

  pe comprising two external walls 3 and separately for each half a rotor 5 (simply sketched in fig 1) with hammers 6 as well as a grid unit

  mobile 7 serving as an opposing tool and rails 8.

  With a single rotor hammer crusher, a

  impact wall may be provided in place of the anvil.

  In addition, the opposing tool can be composed of several

grid units.

  Between the side walls 3 of the envelope, a support tube 9 is fixed. In addition, the envelope has stops 15 arranged on a transverse construction.

14 assembled at the walls 3.

  The rails 8 are fixed in the crushing zone, near the side walls 3; they each consist of a flat part 16 and an end part 17, comprising a rising slope 18 of height hl starting from the part

  plane 16 as well as a downward slope 19 which is connected thereto.

  The grill unit 7 has grill flanges.

  the exteriors and interiors 22, 23, which are provided with bar-

  grid rails 21 Cross links 25 support-

  the flanges of the grid 22 and 23 are formed. These flanges 22, 23 and the transverse links 25 form the grid unit 7, which is itself load-bearing. Between the flanges 22 there is also a box spring 30 whose ends exceed the

  grate outer flanges 22 These ends of the top

  mier 30 have a machined underside 33, with the

  which grid unit 7 can rest on consoles

  or supports 10 fixed to the walls 3 and indicated by lines

genes in phantom.

  On the outer grille flanges 22 it is housed each time two rollers 34, 35; one 34, which is in the direction of mounting of the grid unit 7, is higher by the distance h 2 than the other, relative to the position of

mounting the grid unit 7.

  By a lever 36 the grid unit 7 can be connected to a drive installation (not shown)

  which allows the exit and entry of this unit.

  On their upper edge 44 facing the rotor 5,

  all grid flanges 22, and 23 have recesses

  open elements 45, the shape of which corresponds at least to the bottom of the cross section of the grid bars 21 On the outer and middle grid plates 22, 23, the grid bars 21 rest, with their ends 46 flattened and limited to the height recesses 45, in these On the edge 44 of the outer and middle grid flanges 22,23

  find blocking areas 47,48 which are radially tightened

  LEMENT (relative to the axis of the rotor 5), by screwing elements 49, with the grid flanges 22,23 The screwing elements 49 are constituted by hammer screws 50 and

corresponding nuts 51.

  The blocking sectors 47, 48 consist of

  blocking parts proper 47 ', 48' with an over-

  face 63, 64 facing the rotor 5 as well as with the sur-

  locking or support face 52 and surface part 47 ",

  48 "On the blocking sectors 47 for the flanges ex-

  grille faces 22, surface parts 47 "(which serve

  wind at the same time as a stop against an untimely shifting of the grid bars 21) are placed laterally and, on the blocking sectors 48 for the inner flanges

grid 23 in the middle.

  For anchoring the hammer screws 50, the surface pieces 47 ", 48" have recesses 57 with

  corresponding retainers 57 'For supporting the cor-

  Respondents 51, a washer 55 is provided which is supported, in the case of the outer flanges of the grid 22, on a forked retainer 56 of the recess 53 and, in the case of the inner flanges of the grid 23 clamped together of

  others, on the abutment surfaces 54 'common of the recesses-

  ments 54 made in the grid flanges 23.

  For positioning against the stops 15, the

  grate flanges 22 and 23 have bu

appropriate tees 58.

  To change the grid bars 21, it suffices to loosen the screwing elements 49 and to remove the locking pieces 47, 48 from the grid flanges. The locking pieces themselves can then also be changed or remanufactured.

Claims (4)

  1 Grid unit for a hammer crusher (5), composed of grate bars and grid flanges receiving them, the bars being housed in open recesses placed on the upper edge of the flanges and held by blocking sectors removably assembled to the flanges with locking elements or fixings, characterized in that the locking elements   or fixing (49, 50, 51) seen from the rotor (5) are covered   green by the surface (63, 64) of the blocking sectors (47,   48) which faces the rotor (5).   2 grid unit according to claim 1,   characterized in that the locking or fixing elements   tion (49) comprise a threaded rod (50) and a nut (51).   3 grid unit according to claim 2, characterized in that the threaded rod is formed by a   screw (50), the head of which rests, with a corresponding retainer   laying (57 '), in a recess (57) of the block sectors cage (47, 48).   4 Grid unit according to one of the claims   tions 2 or 3, characterized in that the nuts (51) fit   sink against stops (54 ', 56) arranged on the flas- grid lines (22, 23).   Grid unit according to one of Claims 1 to 4, characterized in that the blocking sectors (47, 48) each consist of blocking parts (47 ', 48') forming the blocking surface or support (52) and one piece   surface (47 ", 488") connected to the locking piece and extends   in the mounted state parallel to the grid flanges (22, 23).