WO2008037515A1

WO2008037515A1 - Roller mill or roll mill

Info

Publication number: WO2008037515A1
Application number: PCT/EP2007/057052
Authority: WO
Inventors: Thomas Rüther; Ludwig KÖNNING
Original assignee: Polysius Ag
Priority date: 2006-08-11
Filing date: 2007-07-10
Publication date: 2008-04-03
Also published as: DE102006037774A1

Abstract

The invention relates to a roller mill or roll mill comprising at least one grinding roller or grinding roll and a jewel bearing that is slidable in a machine frame and is used for accommodating the grinding roller or grinding roll. At least one plain bearing encompassing at least one gliding element and at least one opposite bearing surface is provided between the jewel bearing and the machine frame. The opposite bearing surface is fitted with a coating that has a minimum hardness of 40 GPa. The invention further relates to a roll mill comprising at least one grinding roll and a rotatable grinding plate. The grinding roll is attached to a lever that is mounted within a drag bearing which is provided with at least one gliding surface and at least one opposite bearing surface. The opposite bearing surface is fitted with a coating having a minimum hardness of 40 GPa.

Description

Roller or roller mill

The invention relates to a roller or roller mill with at least one grinding roller or grinding roller and a sliding in a machine frame bearing block for receiving the grinding roller or grinding roller.

In a roll mill, the material to be ground is comminuted by two rolls pressed against each other, wherein a predetermined grinding gap is maintained between the rolls. This is done by a trained as a solid roller first roller at both ends via knuckle in two stationary

Fixed bearing blocks and designed as a Loswalze second roller, which is rotatably mounted at both ends via steering knuckle in two movable transverse to the roll axis loose bearing stones. The jewels are arranged in a machine frame on two opposite sides of the frame, each with a stationary and a sliding bearing stone in the

Machine frame can be provided side by side.

In a roller mill, the material to be ground is comminuted between a grinding table with a vertical axis and a plurality of grinding rollers rotatably mounted in a mill housing. The grinding rollers are freely movable about their axis and substantially stationary, but arranged with respect to the grinding table vertically spring-mounted flying waves. The shafts of the grinding rollers are each mounted in pendulum roller bearings, of which one bearing is designed as a fixed bearing and the other bearing as a vertically movable floating bearing. The movable bearing in turn has a bearing block slidable in the machine frame.

The bearing stones of the mills are often stored with plain bearings in the machine frame. Usually, plain bearing materials made of polymer composite materials with incorporated lubricants are used against a smooth-ground metal material for the guides. These plain bearings are characterized by high dynamic

Loads and a grease or oil lubrication labeled. The lubrication But leads to high investment and operating costs and requires environmentally sound disposal of used lubricant.

The invention is therefore based on the object to provide a bearing for roller or roller mills without or with a greatly reduced grease or

Get oil lubrication.

According to the invention this object is solved by the features of claims 1 and 2.

According to a first embodiment of the invention, the roller or roller mill consists essentially of at least one grinding roller or grinding roller and a bearing block slidable in a machine frame for receiving the grinding roller or grinding roller, wherein at least one sliding bearing is provided between the bearing block and the machine frame, at least one Sliding element and at least one Gegenlauffiäche. The mating surface has a coating which has a hardness of at least 40 GPa.

The roller mill according to a second embodiment substantially comprises at least one grinding roller and a rotatable grinding plate, wherein the grinding roller is mounted on a lever which is mounted in a pivot bearing, wherein the pivot bearing has at least one sliding surface and at least one mating surface, wherein the mating surface with a coating having a hardness of at least 40 GPa.

The mating surface preferably consists of an amorphous carbon layer, for example, made of pure carbon with less than 0.5 at% components of a metal and / or hydrogen, by means of pulsed arc discharge in a vacuum. According to a preferred embodiment, the coating has a coefficient of friction of less than in a dry running plain bearing

0.1 and with reduced lubricant use a coefficient of friction of 0.02. Furthermore, the coating can have a modulus of elasticity of more than 400 GPa.

According to a particular embodiment of the invention, the coating is at least 100 nm to max. 100 μm thick. The having the coating

Basic body of Gegenlauffiäche is suitably made of metal, preferably stainless steel. For this particular mating surface, a sliding element or a sliding surface made of plastic, in particular of a polymer composite material, has proved to be particularly advantageous in the experiments on which the invention is based. In a preferred embodiment of the invention, the sliding element or the sliding surface consists of composite materials made of woven or fiber-reinforced plastic or of textile or fiber minerals which are impregnated with thermosetting polyester resins.

Further advantages and embodiments of the invention will be explained in more detail below with reference to the description and the drawing.

In the drawing show

1 is a three-dimensional representation of a roll mill,

2 is a three-dimensional representation of the sliding bearing stone with sliding element,

Fig. 3 is a front view of the sliding bearing stone with sliding element and mating surface

4 shows a three-dimensional representation of the grinding roller of a roller mill according to a first exemplary embodiment, 5 shows a schematic view of a roller mill according to a second exemplary embodiment,

Fig. 6 is a schematic view of a roller mill according to a third embodiment and

7 shows a sectional view of a pivot bearing.

The roll mill shown in Fig. 1 consists essentially of two pressed against each other rollers 1 and 2, between which the ground material is crushed. Between the rollers, a predetermined Mahlspalt is maintained.

For this purpose, one roller 2 is designed as a hard roller and the other roller 1 as a loose roller. Trained as a fixed roller roller 2 is supported via knuckle 2a in two stationary bearing blocks 3 to a machine frame 4. The trained as Loswalze roller 1 is added at both ends via steering knuckle Ia in slidable bearing blocks 5.

Between the slidable bearing block 5 and the machine frame 4 at least one sliding bearing 6 is provided, which has at least one sliding element 6a and at least one mating surface 6b. The plain bearings 6 are aligned so that the roller formed as a Loswalze roller 1 can be pressed transversely to its axis by means of a pressing device 7 in the direction of the roller 2. Suitable adjustment means maintain a predetermined nip. The trained as Loswalze roller 1 has the task during the grinding process to enlarge the nip in case of need, if too hard and for the normal

Nip to large chunks between the two rollers device. Otherwise, a rigid nip could lead to blockage or damage to the rollers.

The movement of the sliding bearing blocks 5 is ensured by plain bearings 6, which are provided between the bearing block 5 and machine frame 4. The plain bearing will be described in more detail below with reference to FIGS. 2 and 3.

Each sliding bearing block 5 has a slide bearing 6 at the top and at the bottom, wherein the sliding element 6a is respectively held in a groove 5a of the bearing block 5.

The mating surface 6b, however, is attached to the machine frame 4. Of the

Lagerstein 5 can thus, together with the sliding member 6a relative to

Gegenlauffiäche 6 b and the machine frame 4 are moved.

Of course, in principle, the mating surface on the bearing block and the sliding element could be provided on the machine frame. As part of the

However, the invention has proven to be advantageous when the sliding elements on

Lagerstein and the mating surfaces are arranged on the machine frame.

The Gegenlauffiäche 6b has a base body made of metal, preferably stainless steel, which has a coating of an amorphous carbon layer. These

Carbon layer consists in particular of pure carbon with less than 0.5 at% components of a metal and / or hydrogen, which by means of pulsed

Arc discharge is applied in vacuum. The coating preferably has a thickness of at least 100 nm to max. 100 μm. Such a coating has a modulus of elasticity greater than 400 GPa or a

Hardness of at least 40 GPa.

This coating has a coefficient of friction of less than 0.1 in the case of a dry-running plain bearing and a coefficient of friction of less than 0.02 with a reduced use of lubricant.

In the experiments underlying the invention has been shown that a

Sliding element 6a made of plastic, in particular of a polymer composite material is particularly well suited. The best bearing pairing has been found when the sliding element of composite materials of woven or fiber plastic or Fabric or fiber minerals impregnated with thermosetting polyester resins.

In Fig. 4, a part of a roller mill with a grinding roller 8 is shown. This grinding roller 8 usually rolls on a non-illustrated to a vertical

Axis rotating grinding table, wherein the material to be ground in a gap between

Grinding plate and grinding roller 8 is crushed. The grinding roller 8 is in turn held in a stationary bearing block 3 and a sliding bearing block 5, so that the roller 8 is arranged to fly in a vertical spring-flying manner. Pendulum bearings are usually used here as bearings.

In accordance with the slidable bearing block 5 of the roller mill of FIG. 1, the bearing stone in turn has two sliding elements 6a, which are supported in corresponding grooves 5 a of the bearing block 5. The Gegenlauffiächen 6b are again arranged on the machine frame 4.

While the slide bearing 6 has made possible a horizontal movement in the roller mill shown in Fig. 1, the slide bearing 6 is formed as shown in FIG. 4 for a vertical movement according to double arrow 9. Otherwise, the sliding elements and the mating surfaces, as described above, formed in an identical manner.

Fig. 5 shows a roller mill according to a second embodiment, wherein at least one grinding roller 8 rolls on a rotatable grinding table 10. The grinding roller is mounted on a lever 11 which is mounted in a pivot bearing 12. To adjust the grinding pressure of the grinding roller 8, the lever 11 can be acted upon by means of a means 13 with a force. In the illustrated embodiment, the lever 11 is formed as a two-armed lever, wherein the grinding roller 8 are arranged at one end and the means 13 for introducing a force at the other end. The roller mill shown in Fig. 6 differs from this essentially only in that the lever 11 is formed as a one-armed lever which is pivotable in the pivot bearing 12 and in turn by means of a force can be acted upon 13.

The swivel bearing 12 will be explained in more detail below with reference to FIG. 7:

The pivot bearing 12 has, for example, a pin 14 held in the machine room 4, on which the lever 11 is articulated. The two relatively twisting and mutually contacting surfaces of the pivot bearing

12 are formed by a sliding surface 6'a and a Gegenlauffiäche 6'b, wherein the mating surface is provided with a coating having a hardness of at least 40 GPa.

The Gegenlauffiäche 6'b is, for example, by the outer surface of a on the

Pin 14 formed pushed and fastened sleeve formed. The sliding surface 6'a is located, for example, on the inside of a sleeve attached to the lever.

Otherwise, the further embodiments of the sliding surface 6'a and the mating surface 6'b correspond to the properties of the sliding element 6a or the

Mating surface 6b, which have been described in detail with reference to FIGS. 1 to 4.

The slide bearing or the pivot bearing according to the invention are characterized in that they manage without or with a greatly reduced grease or oil lubrication. By using a polymer composite material also a reduction in wear can be achieved by the special

Material of the mating surface is further enhanced. Furthermore, the special bearing combination is characterized by a low frictional resistance and is dirt-repellent.

Claims

claims:

1. roll or roller mill with at least one grinding roller (2, 3) or grinding roller (8) and in a machine frame (4) slidable bearing block (5) for receiving the grinding roller or grinding roller, wherein between

Bearing block (5) and machine frame (4) at least one sliding bearing (6) is provided which has at least one sliding element (6a) and at least one mating surface (6b),

characterized in that the mating surface (6b) has a coating having a hardness of at least 40 GPa.

2. roller mill with at least one grinding roller (8) and a rotatable grinding table (10), wherein the grinding roller is mounted on a lever (11) which is mounted in a pivot bearing (12),

characterized in that the pivot bearing has at least one sliding surface (6'a) and at least one mating surface (6'b), the mating surface being provided with a coating having a hardness of at least 40 GPa.

3. roll or roller mill according to claim 1 or 2, characterized in that the coating consists of an amorphous carbon layer.

4. Roll or roller mill according to claim 1 or 2, characterized in that the coating is made of an amorphous carbon layer consisting of pure carbon with less than 0.5 at% components of a metal and / or hydrogen, by means of pulsed arc discharge in a vacuum ,

5. roller or roller mill according to claim 1 or 2, characterized in that the coating has a coefficient of friction of <0.1 in a dry-running bearing and a reduced friction lubricant use of <0.02.

6. roll or roller mill according to claim 1 or 2, characterized in that the coating has a modulus of elasticity greater than 400 GPa.

7. Roll or roller mill according to claim 1 or 2, characterized in that the coating has a thickness of at least 100 nm to a maximum of 100 μm.

8. roll or roller mill according to claim 1 or 2, characterized in that the coating having the base body of the mating surface (6b) made of metal, preferably stainless steel.

9. roll or roller mill according to claim 1, characterized in that the sliding element (6a) consists of plastic.

10. Roller mill according to claim 2, characterized in that the sliding surface of

Plastic exists.

11. Roll or roller mill according to claim 1, characterized in that the sliding element (6a) consists of a polymer composite material.

12. Roller mill according to claim 2, characterized in that the sliding surface consists of a polymer composite material.

13. roll or roller mill according to claim 1, characterized in that the sliding element (6a) made of composite materials of woven or fiber plastic or fabric or fiber minerals impregnated with thermosetting polyester resins.

14. Roller mill according to claim 2, characterized in that the sliding surface of composite materials of woven or fiber plastic or fabric or fiber minerals, which are impregnated with thermosetting polyester resins consists.