EP0443195B2 - Abrasion-resistant cladding for the roller surfaces of roller machines, in particular high-pressure roller presses - Google Patents

Abstract

In order to provide, for the rollers of roller machines, in particular high-pressure roller presses for pressure-comminuting granular material, an abrasion-resistant cladding which is simple in terms of production technology, easy to draw in and despite profiling and therefore good drawing-in properties also has a high useful life with minimised risk of fracture formation when subjected to high point loading, according to the invention an anti-abrasion protection is proposed which is formed during the operation of the roller press itself in that during the operation of the roller press the intermediate spaces or pockets (15, 36) between the profiles (13, 14, 33) are filled with compressed finely granular material (29, 30) which remains as an (autogenous) anti-abrasion protection during the roller rotations in the intermediate spaces or pockets. <IMAGE>

Description

The invention relates to rollers for a high-pressure roller press for material bed size reduction granular good, with a variety of having on the roller surface Distance from each other outwardly projecting profiles.

In the case of roller crushers and roller mills, brittle ground material is placed in the roller gap, through the two rotatably mounted counter-rotating rollers are separated from one another, drawn in and subjected to pressure comminution there. The so-called material bed comminution in the roll gap is also known a high-pressure roller press, in which the individual particles are caused by friction regrind drawn into the nip in a bed, d. H. in between the material bed compressed on the two roller surfaces Application of an extremely high pressure can be crushed (EP-A-0 084 383). It is understood that the roller surfaces are extraordinary are exposed to high stress and wear. It is therefore known to armor the roller surfaces by pointing to the roller base consisting of welded beads welded side by side Weld layers from hard metallic materials welded, or by one on the roller base body a one-piece or multi-part wear-resistant Applying a jacket made of cast or rolled material. At a welded-on roll armor is made by time-consuming build-up welding of ring layers lying next to each other or through built up an endless spiral build-up weld.

In order for the material to be drawn in by the press rolls, which rubbed the material in the nip must compress and compact, it is known the armored roller shell on its closed hard cylindrical Surface in an additional manufacturing step with a multitude of projecting Profiles in the form of z. B. V-shaped welding beads (EP-A-0 084 383 page 12 penultimate paragraph). But it has with the comminution of the material bed particularly abrasive goods such as ores have shown that during operation the roller press the risk is not excluded that the roller surface due to the formation of trough-shaped washouts or excavations in the areas between the profiled welding beads welded on at a distance from each other wears out relatively quickly because there is always something new to shred Good material in the spaces between the welded Welding beads is pressed in and digs in there. Through pressure island formation in the nip filled with good material to be pressed with high local The closed, hard outer shell of the armored shell can be subjected to point loads Roller jackets are overstressed; Surface cracks can lead to crack propagation lead into the roller body and / or with a soft bottom layer the welded hard profile parts can be squeezed away to the side become. The risk is not excluded that with high point loads at least the welded beads that protrude outwards can partially break out.

The well-known V-shaped welding beads on the press rolls of the EP-A-0 084 383 therefore only serve to improve the good collection capacity of the Press rolls and they are unable to do that between them when crushing the bed pressed-in material with certainty, so that the V-shaped Welding beads do not serve to protect the wear of the press rolls.

From the brochure "High pressure shredding with roller presses" from Köppern GmbH & Co. KG is known to have a V-shape attached to the roller surface Deposition weld beads can be crossed, so that a weld bead grid pattern arises. Within each space between the weld beads there is a spot weld. The low build-up welding beads with the Welding rounded profile are not able to good material to be held with certainty, so that the known welding beads are not effective Contribution to wear protection of the press rolls, but also only improve the good collection conditions. In addition, protection of European patent 0 443 195 the application of surfacing beads be excluded in the case of material bed crushing roller presses.

FR-A-767 645 discloses a roll crusher with rolls whose surface has some recesses or pockets distributed around the circumference, which are to be filled with material to be shredded. Significant areas of Roll surface seen in the circumferential direction between the pockets have their original cylindrical surface on and in the area of the narrowest nip, where the roller press pressure is greatest, the material to be crushed presses in the pocket of one (right) roller against the metallic cylindrical surface section the opposite (left) roller, so that at least this cylindrical metallic surface parts of the crushing rollers against wear are not currently protected. This well-known roller crusher is also possible not about wear protection, but through the configuration of the roller surfaces should be from the material to be shredded such. B. A crushed rock Product produced in the form of small cubes, the one less have flattened form, as can be achieved with conventional roller crushers are.

Spiked rolling mills are also known (eg brochure "HEAVY DUTY TOOTHED CRUSHING ROLLS "from Babbitless, published in 1980) for crushing Stones and ores, with roller surfaces that have a large number of teeth, the teeth of the adjacent rollers in the area of the nip for Exercise the crushing effect on gap. Would the space between the Teeth or spines are permanently filled with crushed material, then the spiked mill could no longer have a crushing effect. An intrusion of the to be shredded There is crushed material in the spaces between the spikes or teeth so not wanted; on the contrary, facilities would then have to be available be the good that undesirably enters the gaps between penetrates the teeth or spines, so that one Spiked roller crusher would be functional again. The spines or The teeth of the spiked roller crusher therefore have nothing to do with wear protection.

FR-A-2 164 120 discloses ribs or other protrusions Rolling mill rolls for the treatment of soft, tough materials such as B. cocoa masses or chocolate masses, which through the ribs or other projections to be cut and tumbled again and again. In this well-known Rolling mill is not about the problem of roll wear.

FR-A-2 057 414 discloses a coal briquette press with on the roll surface arranged briquette troughs for the production of coal briquettes from large Lump of coal. So this is a material shaping and compression process, and the briquette troughs of the rollers are not used to protect against wear, but the material shaping. In the briquette depressions is said to be straight no material is left behind, on the contrary, the shaped ones should Charcoal briquettes from all mold troughs immediately after passing through the good material loosen through the narrowest nip.

From DD-A-270 023, DE-Z-DVS 81, pages 16 to 19, from CIM Bulletin, October 1982, pages 127 to 133, magazines "Industrie Anzeiger" No. 41 of May 22, 1985, page 22, "The Practitioner", August 1985, pages 371 and 372 as well "Welding technology" issue 9/1987, pages 144 and 145 are protective measures against a sliding wear stress known, as in particular in the case of ground-moving machines such as B. occurs in digging excavator buckets. From the the latter publications it is known on the walls of excavator buckets so-called "studs" to weld, then when sliding such Excavator bucket through a grain pile covering the spaces between fill the "studs" with the clearing material itself as it is. The clearing material is just digged into the spaces between the "studs" because the excavator bucket only translates, in no case, however, a rotational movement and certainly not a high-pressure pressing movement. In the well-known "studs" of the excavator buckets, one can Stress in the direction of the blade circumference occurs, but not a high stress in the radial direction, especially not at a height of greater 50 MPa pressure or the equivalent of more than 2000 kN / m roll length, which at the Material bed shredding in the area of the narrowest nip of the press rolls acts on the regrind, which increases the risk of wear on the press rolls results.

The invention is based, for a high-pressure roller press the task to Material bed crushing of granular good simple press rolls to create, which are highly wear-resistant, without reducing their pull-in capacity is.

This object is achieved according to the invention with the measures of claim 1 solved. Advantageous further developments are in the subclaims specified.

Surprisingly, it has been found that when the press rolls are one Good bed crushing high pressure roller press not with welding beads, but with a variety of outwardly projecting profile bodies, namely Profile strips or stud bolts are equipped, the height of which is greater than 5 mm and whose distance is less than 40 mm between the profile strips or stud bolts formed gaps or pockets are so narrow that in operation the roller press these pockets between the profile strips or stud bolts with one and the same compressed and produced by material bed crushing fine-grained, but highly compacted, which remains in these pockets during the roller revolutions, d. H. the tight occupied protruding profile strips or stud bolts of the invention Roller formation are able to take the pressed in between them and after High-pressure material bed shredding agglomerated material certainly always to hold as a compact. In any case, that forms in the pockets between the Profiled strips or stud bolts pressed in and remaining there with certainty Good material an ideal autogenous wear protection. The profile body can also, in contrast to build-up welding beads, easily be formed with sharp edges with which it is stored between them Being able to hold on to good material even better.

The spaces or pockets between the profile bodies are in advance with a foreign compressed fine-grained good material filled in in the building materials area z. B. with a cement clinker / plaster mixture or in the ore area z. B. with highly wear-resistant ceramic material, which remains in the spaces or pockets. For even more secure hold the compressed fine-grained wear-resistant materials in the Spaces or pockets between the profile bodies can also be a suitable one Binder to increase the adhesion of the materials used come. In any case, that which is pressed in between the profile bodies and Good material remaining there provides the ideal autogenous wear protection, whereas the good bed crushing roll profiling described above with a V-shape welded-on build-up weld beads a constant new abrasion or wear exposed to the formation of unwanted surface washings have been.

Even after filling the spaces or pockets between the good material the roller surface attached profile bodies, the distance from each other smaller 40 mm and their height is greater than 5 mm, their ends can still protrude clearly, so that the good intake of the invention Press rolls stays high.

The profile bodies attached to the roller surface can be made from profile strips exist, which are distributed on the roller surface in a grid pattern are arranged. The press rollers can still pull in well can be increased if adjacent profile strips have a different height exhibit. The profile body can also be made from a variety of from the roll surface protruding stud bolts exist on the roller surface are arranged in a grid pattern such that the distance between adjacent Stud bolts both in the same stud stud row as well as to neighboring ones Stud rows are always about the same size. This solution also remains the compressed material during the rotation of the rollers in the Spaces or pockets between the stud bolts and forms the actual one autogenous wear protection. This good bed crushing roll profiling with the hard, wear-resistant, hedgehog-shaped spread over the roller surface Studded stud is also able to withstand point-like peak loads especially when shredding the material bed in the area of the narrowest roll gap High pressure roller press can occur over the protruding stud bolts to lead into the roller base body as crack-free as possible without destroying its surroundings, whereby the high service life of the press rolls according to the invention is still improved.

Should be during the operation of the high pressure roller press individual profile strips or stud bolts break away, although this is partly due to the in the spaces or pockets between the profile strips or studded material are protected from it, so is a simple one Repair of limited destroyed surfaces the roller armor according to the invention Welding new profile strips or stud bolts easily possible in a short time. This repair is much easier and cheaper than the previously necessary repair whole parts of broken or washed out contiguous armor surfaces.

The invention and its further features and advantages are shown schematically in the figures illustrated embodiments explained in more detail.

Fig. 1

die Draufsicht auf die beiden Walzen einer Hochdruck-Walzenpresse mit einer ersten Ausführungsform der erfindungsgemaßen Oberflächenpanzerung;

Fig. 2

schematisch im Querschnitt verschiedene Formen von an der Walzenoberfläche angebrachten Profilleisten;

Fig. 3

an der Walzenoberfläche mit Abstand voneinander angebrachte Profilleisten mit unterschiedlicher Profilhöhe;

Fig. 4

die Draufsicht auf die beiden Walzen einer Hochdruck-Walzenpresse mit einer anderen Ausführungsform der erfindungsgemäßen Oberflächenpanzerung mit aufgeschweißten Noppenbolzen, und

Fig. 5

ausschnittsweise vergrößert den Vertikalschnitt durch einen Noppenbolzen der Fig. 4.

It shows:

Fig. 1

the top view of the two rollers of a high-pressure roller press with a first embodiment of the surface armor according to the invention;

Fig. 2

schematically in cross section different shapes of profile strips attached to the roller surface;

Fig. 3

on the roller surface spaced profile strips with different profile height;

Fig. 4

the top view of the two rollers of a high-pressure roller press with another embodiment of the surface armor according to the invention with welded stud bolts, and

Fig. 5

4 shows a section of the vertical section through a stud bolt of FIG. 4.

Fig. 1 shows a top view schematically High pressure roller press for Good bed crushing of granular goods, which of above about a good job, not shown Nip between the fixed roller (10) and the loose roller (11) is fed. On the surface the driven counter-rotating rollers (10, 11) is a variety of outwardly projecting Welded profile strips (12, 13, 14), which intersects in a grid pattern are arranged. The profile strips could also be in roller-axial direction, in a V-shape and the like be arranged on the roller surface. Between the profile strips (13, 14) is a variety of spaces or pockets of approximately the same size (15) formed, which due to the high pressure in the Area of the narrowest nip after a short time Operating time with the granular pressurized Fill well, which due to the comparative small distance between the adjacent profiles (13, 14) preferably less than 40 mm and a profile height preferably greater than 5 mm during the roller revolutions remains in the pockets (15). The stored in the pockets (15) and remaining there compressed fine-grained good material forms an ideal autogenous wear protection for the entire roll surface.

Various enlarged cross-sections are shown in FIG Shapes of profile strips (13, 14) shown. So is the cross section of the profile strips (16 and 19) rectangular, the profile strips (17, 18 and 20) trapezoidal, and the profile bar shown on the far right has a circumferential groove on its circumference (21), so that in this embodiment in Operation of the roller press not only the gaps or pockets between the individual profile strips with the compressed fine-grained material fill out, but also the recess (21) to. While the profile strips (19, 20, 21) on the roller surface (22) is welded, soldered, are glued on or the like, they are Profile strips (16, 17, 18) in the material of the roller surface (22) anchored e.g. B. by a dovetail groove connection (23). All profile strips (16 to 21) have in common that they are from a hard metallic alloy material, which the formation of sharp edges allows would not be achievable by surfacing. In this way, the profile strips with their sharp edges very well able to between the the profile strips stored or pressed fine-grained good material permanently as wear protection for the roller surface (22) to hold. This applies in particular to the profile strip (18) their undercuts.

As can be seen from Fig. 3, can increase the good pull-in capacity of the press rolls the neighboring ones Profile strips (24, 25, 26, 27, 28) a have different heights. It is clear in the operation of the roller press in the gaps or pockets between the profile strips (24 to 28) stored compressed fine-grained material (29, 30) to see which is the autogenous wear protection forms. Good material can be used in the event of wear (29, 30) subsequently by simply pressing for the purpose of repair or regeneration of the rollers are introduced.

4 is on the Surface of the rollers (31, 32) a variety of welded out protruding stud bolts (33). The stud bolts (33) are in a grid pattern welded with advantage such that the rows of stud bolts applied along the roll surface lines (34, 35) each gap to each other are staggered. The distance Adjacent studs in both the same stud row as well as to neighboring rows of studs always be about the same size, so that between the individual studs are approximately uniform and interspaces of equal size or Bags (36) are formed, which during the Operation of the roller press, d. H. when performing the comminution of granular goods with good material fill, the size of these spaces or pockets (36) is dimensioned so large that the good material during the entire rotation of the Rollers (31, 32) for the purpose of autogenous wear protection remains in these pockets (36).

Fig. 5 shows an enlarged detail of the vertical section through the stud bolt (33) of FIG. 4 in the welded state. The lower class of the Stud bolts (33) and all other stud bolts as well as the profile strips can be from one to the Ring body applied to the roller body (37) and / or from at least one layer next to each other welded weld beads exist. In any case, the material is the underlayer (37) selected so that the stud bolts (33) or weld profile strips well or by means of other connection techniques applied. The studs themselves can be cylindrical, frustoconical or pyramidal Have configuration.

The material of the hard wear-resistant profile strips of Figures 1 to 3 and the studs (33) of Figures 4 and 5 can be made of a metallic Alloy with hard materials in the structure, e.g. B. Carbides and / or special carbides exist and / or be high carbon and / or high chromium. The Profile strips of Figures 1 to 3 and also the Studs (33) of Figures 4 and 5 can also made of hard ceramic material, cemented carbide or the like exist. In any case, the material shows the profile strips or stud bolts after Welding with advantage a core hardness of more as 52 HRC (Rockwell C hardness test). With The profile strips of Figures 1 to have advantage 3 and the stud bolts (33) of FIGS. 4 and 5 a height of at least about 5 mm, e.g. B. 10 mm, and a thickness (diameter) of at least about 8 mm, e.g. B. 15 mm, at a roll diameter of at least 500 mm.

The invention is particularly well applicable to surface armor of high-pressure roller press rollers for material bed crushing or pressure treatment of ores, including ores containing diamonds, which represent particularly abrasive goods. The service life the roll armor according to the invention even with such abrasive goods because only the radially outer surfaces of the profile strips or stud bolts are subject to wear, while the remaining areas of the roll surface and the profiles applied to it by the self-made from compressed material existing wear protection layer against wear are protected.

Claims (7)

1. Rolls or rollers for a high-pressure roll or roller crusher for the interparticle crushing of granular material, the rols or rollers being provided with a plurality of outwardly-projecting sections arranged at a distance apart on the roll surface, characterised in that the sections do not comprise weld beads but instead comprise sectional or profiled elements (13, 14, 33) with the distance between neighbouring sectional or profiled elements (13, 14, 33), which form spaces or pockets (15, 36) between each other, being less than 40 mm, and the sectional or profiled elements being greater than 5 mm in height, as a result of which the spaces or pockets (15, 36) between the sectional elements are completely filled during operation of the crusher with compressed fine-grain material (29, 30) and are filled in advance with extraneous compressed fine-grained material which remains in the pockets during rotation of the rolls or rollers and confers protection against wear.
2. Rolls or rollers according to claim 1, characterised in that the sectional elements fixed to the roll or roller surface comprise sectional strips (13, 14) which are distributed over the roll surface in a cross-over lattice pattern.
3. Rolls or rollers according to claim 2, characterised in that neighbouring sectional strips (24 to 28) are of different height.
4. Rolls or rollers according to claim 1, characterised in that the sectional strips comprise a plurality of stud bolts (33) projecting from the roll or roller surface.
5. Rolls or rollers according to claim 4, characterised in that the stud bolts (33) are distributed over the roll or roller surface in a lattice pattern so that the distance between neighbouring stud bolts in both the same stud bolt row and in neighbouring stud bolt rows is always of the same approximate dimension.
6. Rolls or rollers according to any one of the preceding claims, characterised in that the sectional strips (13, 14) or stud bolts (33) are made of a metallic alloy of structurally hard material, such as carbides and/or special carbides.
7. Rolls or rollers according to claim 1, characterised in that the extraneous compressed fine-grained material is provided with a binder to increase its adhesion.

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