FR2541135A1 - METHOD AND ROLLER WITH CYLINDERS FOR PRESSURE CONTINUOUS FRAGMENTATION OF FRAGILE BROWN MATERIAL - Google Patents

Abstract

THE INVENTION CONCERNS A PROCESS FOR THE CONTINUOUS FRAGMENTATION BY PRESSURE OF A FRAGILE CRUSHING MATERIAL. IN THIS PROCESS, CARRIED OUT IN A DRIVEN CYLINDER CRUSHER WITH GREAT PRESSURE FORCE, WHICH WORKS IN THE REGION OF THE NARROW PART OF THE SLOT BETWEEN CYLINDERS ACCORDING TO THE PRINCIPLE OF FRAGMENTATION IN BED OF MATERIAL, THE MATERIAL HAS CRUSHING IS LOADED IN THE SLOT BETWEEN CYLINDERS WITH A FLOW SUCH AS IT IS FORMED ABOVE CYLINDERS 10, 11 IN A WELL 13 A LUMP OF LOADED MATERIAL 9 ALMOST STILL, WHICH TAKES SUPPORT ON THESE CYLINDERS AND FROM WHICH THE MATERIAL LOAD IS INTRODUCED BY THE CYLIDERS INTO THE SLOT BETWEEN CYLINDERS, BY FRICTION DRIVE. APPLICATION IN PARTICULAR TO THE FRAGMENTATION OF CEMENT CLINKER.

Description

According to the German patent application

  bf 33 02 176 7, a method and a device for the frag-

  continuous pressure massage of a building material

  as, for example, cement clinker,

  the feature that separate grain fragmentation and bed fragmentation

  of material are performed simultaneously in the slot

  to be cylinders of one and the same machine with cylinders,

  in that the material to be grinded is first of all prefabricated

  separated by the distinct grain-breaking phase in the wide part of the cylinder gap, and that, immediately after, in the region of the narrowest part of the cylinder gap, the fragments of material to be crushed. that are formed during distinct grain fragmentation are again

  fragmented by the fragmentation phase into a bed of

  The roll machine is here a roll mill.

  we are working with a great power of

  of the cylinders acting on the material to be crushed,

  more than 2 t / cm length of cylinders.

  Until now, the roll mills were working by conveying the material to be milled in the slot between cylinders with a speed

  close to the circumferential speed of the cylinders.

  For this purpose, it is arranged above the slot between cylinders.

  a free-fall well of such a height that the grains of the charged material are accelerated in their fall to the circumferential speed of the cylinders

  This rule was also valid

  for roll mills which are made to work according to the principle of fragmentation into a bed of material,

  with circumferential speeds of cylinders relative to

  for example, more than 10 m / s With the fragmentation into a bed of material that must be

  work with high flow rates, the material char-

  is moved to the cylinder-to-cylinder slot

  enough for the material to be fragmented and introduced

  duit between the cylinders spreads the cylinders one of

  the other, and that the particles of the charged material become

  glomerate between them in the slot between cylinders,

  a tablecloth or a bed of material It is easy to com-

  take that in the already known roll mills,

  the free-fall well arranged above the slit

  rolls to channel the loaded material is

  as high as the circumferential velocity of the cy-

lindres is growing.

  The object of the invention is to improve the object of the aforementioned document.

  surprised that the material to be crushed can also

  be introduced into the cylinder-to-cylinder slot of a roll mill, in particular

  cylinders that works on the principle of fragmentation

  in bed material when the material to be crushed is brought to the slot between cylinders with a flow rate such

  that a mass of matter is formed above the cylinders

  charged almost immobile, which is supported by these

  linders, and from which the loaded material is introduced

  in the slit between cylinders by the cylinders by a friction effect According to the invention, it is

  above the level of the cylinders of the

  lindres, above the slot between cylinders, a well for loading the material to be crushed which is constantly filled with a mass of matter loaded almost immobile and which bears directly on the cylinders and whose

  height, measured above the plane of the ex-generators

  upper trenches of the rolls, is at least equal to three times the maximum size of the filled grains In the case of grinding cement clinker not previously fragmented, the upper dimension of the loaded grains is approximately 100 mm so that, in this case the loading shaft is at least 300 mm high and,

  therefore, relatively small.

  The figures of the appended drawing, given solely by way of non-limiting example, will make it clear

  how the invention can be realized.

  Figure 1 shows a roller mill

  for grinding cement clinker 9 not previously

  fragmented, which is fragmented according to the com-

  having a distinct grain fragmentation combined with material bed fragmentation The grain size of the largest proportion of the material to be milled 9, which can be up to 100 mm, is larger than the width of the cylinder gap , for example, 20 mm, formed between the rolls 10 and 11,

  which have, for example, a diameter of 900 mm.

  The width of the rolls is, for example, 250 mm.

  pressure in the hydraulic circuit of the pressure

  Cylinders are approximately 50 to 70 bars, which

  corresponds to a cylinder pressure force of 6.1 to

  8.6 t / cm roll width The circumferential speed

  The roll ratio is approximately 0.31 to 0.43 m / s,

  which corresponds to a speed of rotation of the cylinders

  The cement clinker emerges from the split between cylinders in a fragmented state and partially sintered into a web. The sails are divided in a downstream apparatus such that

  tubular mill, an impact mill or equivalent

  slow and, at the same time, possibly crushed to the

final ness of the cement.

  Above the level of the cylinders 10, 11 is arranged above the slot between cylinders, a well 13 for loading the material to be crushed which is filled with a mass of material to be grinded 9 almost immobile, which rests directly on the cylinders and from which the rolls 10, it attracts the material to be crushed 9 in the slot between cylinders by a friction effect The loading well 13 advantageously has, for

  the evacuation of the material to be grinded in excess, a surplus

  14 which is connected through

  transporters 15, 16 to a storage hopper 17 of the material to be ground (for example cement clinker),

2541135-

  this hopper is in turn connected to the load shaft-

  13 by an adjustable dosing member 18 such as, for example, a vibrating chute, a flap, a flip-flop

  conveyor belt or equivalent

  13 may advantageously have a device for measuring the filling level which is in operative connection with the adjustable dosing member 18.

  ensures that the loading shaft 13 is always maintained

  days full, by the fact that is always routed to the well 13, starting from the hopper 17, an amount of loading material greater than that the cylinders attract and that the excess part is

  returned to the hopper 17 through the

  In the loading shaft 13, an adjustable dosing flap 19 can be arranged which is suspended at its upper end by a hinge and which can be adjusted in inclination by means of a screw. dosing 19 is controlled according to the attraction behavior of the loading material and the flow rate of the material 12 that comes out

of the slot between cylinders.

  The roll mill of FIG.

  1 of that in that the loading well 13a is asymmetrically disposed above the level of the cylinder gap and that the wall of the loading well which is closest to the

  the slot between cylinders has a metering flap 19 a

  voting and / or rotating, connected to a screw 20a and which, at the same time

  closed state, is in a vertical position and is

  directed to one of the cylinders (10)

  13a is filled with cement clinker 9 of the same type.

  that well 13 of Figure 1 The asymmetrical

  loading well 13a serves to avoid the risk of

  possible formation of vaults of matter in the

loading well.

  According to one embodiment of the invention, the mill rolls, which are otherwise smooth, comprise

  ribs, for example V-shaped ribs,

  carried by welding, whose projecting height above the surface of the rolls is at least 0.5 times the

  average grain size of the loaded material.

  It goes without saying that we can bring to the example of

  realization which has just been described, various modifications

  in particular by substitution of technical means

  equivalent, without departing from the scope of the invention.

Claims (6)

CLAIMS A method of continuous fragmentation by pressure of a brittle grinding product such as, for example, cement clinker, in which separate grain fragmentation and bed fragmentation of material are carried out simultaneously in the slit between cylinders. of a single cylinder machine, in that the material to be ground is first prefragmented by the discrete grain fragmentation phase in the wide portion of the cylinder gap and that, below, immediately afterwards, in the region of the narrower part of the cylinder gap, the fragments of material to be ground which have formed during the course of the fragmentation into distinct grains are again fragmented by the fragmentation phase into a bed of material. characterized in that the material to be milled is fed to the slot between cylinders at a rate such that a mass of charged material is formed above the rolls. still, which is supported on these cylinders, and from which the charged material is introduced into the slit between cylinders by the cylinders, by a friction effect.   2 Roll mill for fragmentation   continues by pressing a fragile grinding material,   especially for the implementation of the process according to the   1, characterized in that a well (13, 13 a) for loading the material to be ground is provided above the level of the rolls (10, 11) above the slot between rolls, which is filled with a mass of matter   charged (9) almost immobile and which directly   the cylinders, and from which the cylinders introduce the loaded material (9) into the slot between   cylinders by a friction effect.   Roll mill according to claim   2, characterized in that the height of the charging well-   (13, 13 a) measured above the plane of genera-   these upper cylinders (10, 11) is at least equal   three times the maximum grain size Elderly.   4 Roll mill according to the claims   2 and 3, characterized in that the loading well (13, 13 a) has an overflow (14) for the discharge of the excess charged material which is connected by conveyor devices (15). , 16) to a hopper   reserve (17) containing the loading material, this   the hopper being on its side in communication with the loading well (13) via an organ adjustable dosing head (18).   Roll mill according to Claim 4, characterized in that an adjustable dosing flap (19)   is arranged in the loading well (13).   6 Roll mill according to any one of   Claims 2 to 4, characterized in that the well   load (13 a) is arranged asymmetrically   above the level of the slot between cylinders and in that   the wall of the loading well nearest the fen   The cylinder valve has a pivoting and / or rotating dosing flap (19a) which, in the closed state, is in a vertical position and is directed towards one (10) of the cylinders.   Roll mill according to one of the claims   4 to 6, characterized in that the charging well-   (13, 13 a) is equipped with a measuring device for   calf filling which is in connection with the organ of adjustable dosage (18).   8 Roll mill according to any one of   Claims 2 to 7, characterized in that, on the   cylinders, which are otherwise smooth, are formed ribs, for example, V-shaped ribs,   reported by welding, the projecting height of which   above the surface of the cylinders is at least 0.5   the average grain size of the material Gee.