DE2118851A1 - Grinding rings and grinding discs for vibratory mills - Google Patents

Description

Grinding rings and grinding disks for vibratory mills.

In Schwing @@ hlen, whose grinding media are periodically on the circumference of the @@ hlen roll, have intermingled grinding rings and grinding disc as grinding media proven.

The planet-like orbital movement creates a relative movement that increases towards the center Circulation speed of the grinding media to the grinding container and an increasing speed to the periphery Compressive force.

The stability of the orbital movement depends on the distance between the grinding bodies (crushing gap), the oscillation circle diameter UnG the oscillation number the plane-parallel movement of the manl container.

Tests have shown that with appropriate dimensioning of the Crushing gap and the grinding surfaces with comparable final fineness from coarse grain to significantly higher specific throughput rates per ton of grinding media compared to the single grain range are achievable than with conventional mills and vibratory mills with ball or Rod filling.

The specific wear of the grinding media g / t throughput in continuous Operation of the mill remains within the usual framework, while the use of the grinding media is less favorable than with the conventional Kungel or Sta @ mills.

For example, with a crushing gap of 50 mm, the grinding rings and die-disc after reducing the outside diameter by 10-15 mm and Enlargement of the inside diameter to be replaced by the same amount, because Otherwise the crushing gap between the grinding rings will be too large, and the stability of the Circumferential movement is no longer sufficient. By adjusting the amplitude and the speed The stable area can be increased to the growing crushing gap, but none fundamental end can be achieved.

The wear on the outer surfaces is quite a bit with all grinding media the same, while at the end faces they are due to different relative speeds and surface pressures are of different sizes. The face wear has on the Grinding process does not have an immediate effect if you consider the weight loss of the grinding bodies disregards.

A periodic Mach filling of the grinding media as with the conventional ones Mills became completely unregulated crushing gaps and unsafe conditions for perform the @brolling process.

The invention is based on the task, this disadvantage, which unfavorable on the operating costs of the continuously operating vibrating disc mill affects to eliminate and develop deficiencies, which as far as possible # @use of high-quality wear materials is allowed, whereby the @interpretation of Wear parts must be made so that their service life with the respective operating periods and the @ us and @inbau, which in itself are simple and quick to implement the heat sink does not cause any interruption in operation.

According to the invention @ahlringe and @ahlenscheibe each consist of one the end. Material of normal strength manufactured core body, which on its outer and Inner jacket with a wear jacket made of material of high strength and hardness low @ and strength is around @ en.

Furthermore, the front surfaces of the grinding media are wholly or partially covered with disc-shaped rings or counter plates made of wear-resistant material, the thickness of which can be greater than the wall thickness of the wear sleeves.

The minimum wall thickness of the wear jackets is due to the manufacturing process determined @nd can z.ß. for chilled cast iron by centrifugal casting or metallurgical measures can be brought to the desired aces without ijiechanische processing. -from that The ratio of the strength to the possible wear results in the utilization of the @materials.

The wall thickness of the rings or segment plates for the face is because wear and tear has no effect on the stability of the rolling process, useful so strong that their service life is a multiple of the service life of the Schlefl coats amounts to. The material utilization also takes favorable values for chilled cast iron bodies at.

No major impact forces act on the grinding rings and disc during operation and there are no high temperatures either with dry or wet grinding.

@ie @reusability of the core bodies, which are derived from @ tahlgu @ resp.

@undstahl must be created when attaching the loop jacket and end plates are ensured. The @chleißmäntel made from Hart @ uss It is therefore advisable to fasten the bodies in such a way that there are gdr between the machined Areas of the core core and the unprocessed areas of the hard cast parts to compensate the necessary gap space with a metal of n @ edrigem Sch @elzpunkt or a self-hardening plastic or cement mixture. By Both parts can be heated to a few 100 ° C after using the @ chloißmant @ ls are quickly separated from each other.

One embodiment of the invention is that the @chlei @@@@ tel consists of one or @enreren @ingen from lachstan @ bands @oher @estigkeit. the The number of rings depends on the width of the approx. 8-15 mm thick flat steel and the necessary height of the grinding rings respectively. @ahlscheibe. @ Instead of the flat steel straps @artstahlolechstrips or sus @int @@@ etall strips can also be used.

The straps are fastened to the bodies by @ e @ ts @@@ ei @ ung, K @ ebeverfanren or by wedging in grooves, the Vo @ core body and the end rings or face plates formed wer @ en.

The @ringe @ and strength of the @ abrasive bands and the high strength, which apply to suitable types of steel by hardening and tempering according to de @ the core body can still be improved, c @ lau @ t ei @ e optimal @use of the wear-resistant materials and adaption of the service life to the operating periods the @machine.

with the previous solutions is assumed to be a prerequisite, because the @brussing of the wear jacket in the full height of the @shellbody approximately evenly erfo@gt.Bei higher @ahlringen and @@@ lacheiben, which for certain @ ahlv @ rgang vo @ be able to participate, this requirement is no longer given, and it must If the lower area is expected to be more heavily used. In your case it is advisable that the core and the wear cover are subdivided in the vertical axis so that after a period of operation the lower, more heavily worn part continues obe @ can be set. @ a This enables extensive utilization of the wear material also achieved with downward wear of the outer surface.

If the grinding rings and the disc are large, there is a support the relatively thin-walled wear strips and wear plates on special Support segments necessary. Between the two-part core bodies are on the outside and The inner jacket is clamped to the support bar, on which the wear bands respectively.

Wear plates, as already described, are attached.

Armouring of the support segments by build-up welding can also be used be economical. The additional cost of this implementation does not burden the Wear costs, since the support segments can be used again.

The following are exemplary embodiments of the invention with reference to the drawings and shows: Fig. 1 The division of a grinding ring into a core body, in wear coats and in front rings respectively. Segment plates in the cross-section.

Fig. 2 An embodiment of the inner and outer casing made of flat steel and the fastening of the flat steel a to the core body.

Fig. 3 A division of the wear band into several one above the other Tapes.

Fig.4 The plan of a segment plate made of chilled cast iron to protect the End faces of the grinding media.

Fig.5 The vertical division of the grinding ring and grinding disc Axis in the cross section.

Fig. 6 The additional arrangement of support segments for the wear plates in @uschnitt.

The ring-shaped core body (l), which is made of cast steel of normal strength can be made is of an outer jacket (2) and an inner jacket (3) of Surrounded by a thin layer of wear-resistant material.

The lower face is with a disc-shaped ring (4), the appropriately divided into segment plates (5) for larger dimensions The wall thickness of the segment plates (5) made of chilled cast iron can be greater than the wall thickness of the wear sleeves (2 and 3).

D @@ for tolerance compensation between the machined surfaces of the core body (1) and the unworked surfaces of the wear sleeves (2 +3) and the segment plates (5) provided gap spaces (6 @ 7) be with a metal, da @ a @ has a low melting point or a self-hardening plastic or zenent connection filled out @ t.

The segment plates (5) throw through screws (8) with the core ring (1) connected.

Since thin and strong in the chilled cast iron (2 + 3) only by casting or metallurgical measures that make production more expensive are possible of high strength flat steel strips is of particular interest.

Fig.2 shows such a solution: The flat steel strip (9), which the outer jacket and the Flachstanlband (10), which forms the inner jacket, is on the core body (1) fastened the stitching (11).

@The joint can also be secured by tack welding (12).

The disk @ shaped ring (4) or the segment plates (5) are through Screws (8) attached to the core body (1).

A division of the wear jacket into several one above the other Fig. 3 shows tapes if, for reasons of appearance, there are several tapes for the height of the wear jacket are required, the material used to manufacture them determines theirs The straps (9 and 9 ', 10 and 10') can be inserted into grooves (13 and 13 ') of the core body are clamped or by tack welding (11) or adhesive processes be attached. ### The shape of a segment plate (5) made of chilled cast iron to protect the 4 shows the front surface of the grinding body in plan.

A subdivision of the core bodies and wear coats in the vertical Axis shows Fig. 5 in cross-section. When the wear and tear of the wear coats in the lower Zone is larger than in the upper, it is appropriate to the core body (1) in one to divide larger upper part (14) and a smaller lower part (15).

After the wear bands (9 '' and 10 '') have been worn down to about half their wall thickness are the segment plates (5) on the lower face of the Upper part (14) and the lower part (15) turned over onto the upper face of the upper part (14) and fastened with the screws (8).

With large dimensions of the grinding rig and the disc, the support is the relatively thin-walled wear strips or plates on special support segments (16,16 ') necessary An arrangement of the additional support segments for the wear bands or plates is shown in Fig. 6. These support segments are on Outer and inner jacket clamped between the core ring halves (1 and 1 '), which through the screws (8) are pressed together over the segment plates (5). On the support segments (16 and 16 ') the wear bands respectively. - Plates (9 and 9 ', 10 and 10') attached.

Claims (7)

P a t e n t a n s p r ig c h e 1. Grinding rings and grinding disks for vibratory mills whose grinding media are @ Roll around the circumference of the grinding container, characterized in that grinding rings and disc each consist of a core body (1) made of material of normal strength, the one on its outer and inner jacket with a material made of high strength and Hardness-made wear jacket (2 and 3) is surrounded by a strong one. 2. grinding rings and grinding disc according to claim 1, characterized in that the end face of the grinding media completely or partially with disc-shaped rings (4) or segment plates (5) made of wear-resistant material, the thickness of which is coarser can be as the wall thickness of the wear cover. 3. grinding rings and jjahlscheihe according to lmspruch 1 and 2, characterized in that between the machined surfaces of the core and the unmachined surfaces the hard cast parts to compensate for the tolerances necessary gap space (6 and 7) a metal with a low melting point or a self-hardening plastic or cement mix is filled. 4. @ a @ lrings and grinding disc according to claim 1 characterized thereby that @ the wear sleeves (2 and 3) made of one or more rings made of flat steel strips (9 and 10) consist of high strength. 5. grinding rings and grinding disc according to claim 1, 2 and 4, characterized in that the fastening of the straps (9 and 10) to the core body (1) by tack welding (11), adhesive process or by clamping in grooves (13, 13 '), which are from the core body (1) and the end rings (4) or segment plates (5) are formed. 6. grinding rings and grinding disc according to claim 1 and 2, 4 and 5 thereby characterized in that the core body (1) and wear jacket (2 and 3) in the vertical schse is divided. 7. grinding rings and grinding disc according to claim 1 and 2,4-6, characterized in that between the two-part core body (1 and 1 ') on the outer jacket and inner jacket are support segments (16 and 16 ') to which the flat steel strips (9 and 9' and 10 and 10 ') are attached. L e r s e i t e