EP3313576B1 - Material-bed roller mill - Google Patents

Description

Technical area:

The present invention relates to a high-bed roller mill, comprising two juxtaposed, in a ground state axially parallel aligned and counter-rotating rollers, which form a nip between them.

State of the art:

Such high-bed roll mills, also called roll presses, are used for example in the cement industry to grind cement raw material, cement clinker and granulated blastfurnace slag.

Between the two grinding rollers of the high-bed roller mill, a nip or grinding gap is provided. The material to be shredded is located above the nip. The two rollers driven in opposite directions cause the material to be shredded pulled through the nip, it is pressure-loaded and thus crushed. The two grinding rollers must be pressed with very high forces radially in the direction of the nip, so that the desired Goodbettzerkleinerung sets.

Usually, in a good-bed roller mill, one roller is designed as a hard roller and the other as a loose roller. The pressure necessary for comminuting the material to be ground is applied to the idler roll by way of articulated hydraulic cylinders. To support the forces acting on the roller forces a frame is provided. Since the forces acting on the rollers, especially in very hard mineral materials are large, the requirements for the stability of the frame are very high. This results in that Gutbett roller mills have a complex frame construction.

The high grinding forces lead to a rolling deflection, which acts inter alia on the bearings of the rollers. The demands on the bearings of the rollers are therefore very high in terms of durability and flexibility.

In some of the known Gutbett roller mills has the disadvantage that regrind, which is significantly larger than the nip, the nip over the entire width expands. This has the consequence that the quality of grinding along the nip deteriorates, at least temporarily, until the oversized or too hard material to be ground leave the nip and the desired gap width has re-established.

Known designs of the good-bed roller mills are often built on the principle of linear guide. These can move - also by slightly tilting - follow the material to be ground and avoid the above drawback. The orientation of the mill on the foundations is complex, to avoid jamming in the roller guides.

Another type of execution of a good bed roller mill on the principle of circular arc guide, such as from the documents DE 1 927 164 A1 and the US 4154408 A Although known, although a relatively simple frame construction, but the Mahlspalt opens in parallel, regardless of where the oversized or too hard material to be ground passes through the gap. A worse grinding result is the result.

Presentation of the invention:

It is an object of the present invention to provide a good bed roller mill, which is suitable, in particular to grind very hard material and thereby has a simple construction, in particular a simple frame construction.

Moreover, it is an object of the present invention to provide a high-bed roll mill in which the roll deflection generates no constraining forces in the roll bearings.

Finally, it is the object of the present invention to improve the grinding quality, in particular to improve the grinding quality in the case of inhomogeneous material to be ground with oversized or too hard material to be ground.

According to the invention, the object is achieved by a high-bed roller mill comprising two juxtaposed, in a ground state axially parallel aligned and counter-rotating rollers forming a nip between them, a foundation, two roll holders, in each of which a roller is rotatably mounted, each Roller holder is pivotally mounted to the foundation, and a nip acting on the tensioner, which is arranged outside the nip and connects both roll holders together, each roll holder two Swing, which are formed as separate components, each arranged at one end of a roller and are deflected independently, at least one rocker is able to perform at least two of the following movements: pivotal movement about an axis parallel to the roll axis, rotational movement about the longitudinal axis the rocker, rotational movement about an axis parallel to the longitudinal axis of the rocker, rotational movement about an axis perpendicular to the longitudinal axis of the rocker.
The ground state of the good bed roller mill is to be understood as meaning the state of the good bed roller mill, in which no ground material is located in the good bed roller mill.

The good-bed roller mill according to the invention has a comparatively simple and inexpensive construction, since the force-absorbing frame construction known Gutbett roller mills is replaced by a roller guide, which is essentially composed of two swing mounts and two roller mounts.

The good-bed roller mill according to the invention is also comparatively compact, so that the good-bed roller mill according to the invention requires a comparatively small footprint. The compact design also reduces the weight and handling of the individual components. The smooth running of the machine during operation is also increased by the comparatively low inertial mass of the components.

In addition, the requirements of the good-bed roller mill according to the invention to the set-up tolerance compared to known low-bed roller mills are lower.

The formation of the wings as separate components has the advantage that the rollers, for example, for maintenance work on the surface of the roller, are easily accessible from the side facing away from the refining gap. A time-consuming and costly removal of the rollers is not mandatory.

The separation of the roll holder in two wings means a decoupling of the movement of the individual wings, so that the expansion of the nip can be reduced in the passage of an oversized or too hard ground material on a part of the roll width. As a result, the milling quality across the nip width is improved and the energy consumption per milled ton is reduced.

The fact that at least one rocker is able to perform at least two different movements, forces that during the milling process due to Slanting arise bending rollers can be prevented, resulting in a significant relief of the bearings that are used to support the rollers in the swingarm.

Different rotational and pivoting movements can be superimposed here in order to ensure a comparatively large mobility of the at least one rocker.

Preferably, at least one rocker of a roll support is capable of rotational movement about an axis perpendicular to the longitudinal axis of the rocker and perpendicular to the longitudinal axis of the roll. In this movement possibility, a comparatively high proportion of the forces occurring during the milling process due to skewing of bending rolls can be prevented.

In a preferred embodiment, it is advantageous that at least one rocker is mounted spherically.

It is further preferred that the clamping device comprises two clamping units and each clamping unit is connected to two opposite wings. In this way, a regulation of the nip across the width and thus a further improvement of the grinding quality can be achieved.

Moreover, it is further preferred that the clamping device comprises a clamping cylinder and the connection points of the clamping cylinder are rotatably mounted on the rockers. As a result, the clamping cylinder can be performed even without elaborate joints in the cylinder interior.

It is further advantageous that the clamping device comprises a clamping cylinder and at least one end of each clamping cylinder is detachably connected to a rocker. This allows access to the rollers or nip for maintenance and malfunction.

For maintenance purposes, it is advantageous that each rocker is pivotable relative to the foundation from an operating position to a maintenance position. Thus, for example, each rocker by at least 15 °, preferably up to 90 ° relative to the foundation hinged in the sense of hinged in order to obtain a free access to a roller and to optionally replace the roller can.

It is particularly advantageous that on each rocker a surface or device is provided, on which the rocker can be stored when unfolding. Add-on parts, such as gearbox, can be stored in the devices during Ausklappvorgang. The cylinders of the clamping device can be used as auxiliary elements in the process of unfolding.

Cylindrical roller or sliding bearings are preferably used for the storage of the rollers, since they are relatively cheap and have a high load rating based on the volume of construction.

It was found that the grinding surfaces of Loswalzen wear faster than those of the fixed rollers. It is preferred that each roll holder has at least one receptacle for locking bolts, so that each roll can be used as a Loswalze and locking roller to obtain the most uniform wear of the rolls.

Brief description of the drawings:

Fig. 1

eine Gutbett-Walzenmühle in perspektivischer Ansicht gemäß einer ersten Ausführungsform,

Fig. 2

die Gutbett-Walzenmühle gemäß der ersten Ausführungsform von vorne,

Fig. 3

die Gutbett-Walzenmühle gemäß der ersten Ausführungsform in seitlicher Ansicht,

Fig. 4

die Gutbett-Walzenmühle gemäß der ersten Ausführungsform in einer Wartungsposition,

Fig. 5

die Gutbett-Walzenmühle gemäß der ersten Ausführungsform von oben in Grundstellung,

Fig. 6

die Gutbett-Walzenmühle von oben mit Fremdkörperdurchgang,

Fig. 7

eine Gutbett-Walzenmühle in perspektivischer Ansicht gemäß einer zweiten Ausführungsform, und

Fig. 8

eine Gutbett-Walzenmühle in Vorderansicht.

Preferred embodiments will be explained in more detail with reference to the accompanying drawings, in which:

Fig. 1

a good bed roller mill in a perspective view according to a first embodiment,

Fig. 2

the good bed roller mill according to the first embodiment from the front,

Fig. 3

the good bed roller mill according to the first embodiment in a side view,

Fig. 4

the good bed roller mill according to the first embodiment in a maintenance position,

Fig. 5

the good bed roller mill according to the first embodiment from above in basic position,

Fig. 6

the good bed roller mill from above with foreign body passage,

Fig. 7

a good bed roller mill in a perspective view according to a second embodiment, and

Fig. 8

a good bed roller mill in front view.

Ways to carry out the invention and commercial usability:

Fig. 1 shows a good-bed roller mill 10 in a perspective view obliquely from above. The good-bed roller mill 10 comprises two juxtaposed, axially parallel aligned rollers 12, 14 which are rotatably mounted. The rollers 12, 14 are individually driven by means of drive units 16, 18 and rotate in a known manner in opposite directions. Furthermore, a clamping device with clamping cylinders 20, 22, such as hydraulic cylinders is provided. The tensioning device is arranged outside, in particular above the roller gap formed by the rollers 12, 14.

A foundation 11 comprises two parallel and spaced strip-shaped rocker receivers 24, 26, which are aligned substantially perpendicular to the axis of the rollers 12, 14. On the foundation 11, two roller holders 28,30 are arranged, in each of which a roller 12, 14 is rotatably mounted. Each roller holder 28, 30 has two formed as separate components rockers 32, 34 and 36, 38, which are each rotatably and pivotally attached to the rocker mounts 24, 26.

The rockers 32, 34 and 36, 38 are independently deflectable.

Each rocker 32, 34, 36, 38 comprises two substantially C-shaped plate members 40, 42, which are arranged parallel and at a distance from each other. The upper and lower portions of the two C-shaped plate members 40, 42 are connected to each other by means of an upper pivot axis 44 and a lower pivot axis 46 (see Fig. 3 ).

In the rocker seats 24, 26 holes are provided through which passes through the lower rocker axis 46. In this way, a hinge connection between the foundation, in particular the rocker receptacle 24, 26 with the corresponding rockers 32, 34, 36, 38 is formed. In order to achieve a possible low-friction pivoting of the rockers 32, 34, 36, 38 with respect to the rocker seat 24, 26, not shown, maintenance-free spherical plain bearings are provided.

Each clamping cylinder 20, 22 has at its two end portions a bore through which passes through the upper rocker axis 44. This creates a joint connection between a rocker 32, 34, 36, 38 and an end portion of the clamping cylinder 20, 22. Although not shown, so hinge bearings are provided to achieve a low-friction pivotal movement between clamping cylinder 20, 22 and rockers 32, 34, 36, 38.

The two clamping cylinders 20, 22 are detachably connected to the wings 32, 34, 36, 38.

As in particular in Fig. 2 It can be seen, form each a rocker seat 24, 26, the two attached to the rocker seat 24 and 26 rockers 32, 36 and 34, 38 and the associated clamping cylinder 20 and 22 two consecutively arranged frame in which the two rollers 12 , 14 are arranged.

The rollers 12, 14 each have a roller body 50 and a shaft 52 (see Fig. 3 ). The rockers 32, 34, 36, 38 are arranged at both rollers 12, 14 respectively on both sides of the roller body 50 on the shaft 52, wherein the rollers 12, 14 are each rotatably mounted in the concave portion of each rocker 32, 34, 36, 38. The bearings of the rollers 12, 14 by means of suitable bearings, such as roller bearings and / or plain bearings. In particular, multi-row cylindrical roller bearings, multi-row tapered roller bearings or radial plain bearings are suitable.

Fig. 4 shows the good bed roller mill 10 in a maintenance position. Here, the clamping cylinders 20, 22 of the wings 32, 34, 36, 38 are removed. The rockers 32, 34, 36, 38 are pivoted outwardly or folded outwards, so that the rollers 12, 14 are freely accessible to perform maintenance on the rollers or to replace them. Alternatively, the clamping cylinders 20, 22 can be decoupled on one side.

In particular Fig. 4 shows the rockers 32, 34, 36, 38 by a large angle, in particular by an angle> 15 °, preferably up to an angle of 90 °, with respect to the rocker seat 24, 26 are pivoted.

Fig. 5 shows the good bed roller mill 10 in a ground state. The two rollers 12, 14 have a uniform nip 54 across the width of the roller 12, 14. The two clamping cylinders 20, 22 are in their normal position.

For the grinding process, the material to be ground is placed above the nip 54 on the two rollers 12, 14. Due to the friction on the roll surface, the material to be ground is pulled into the nip 54 and comminuted in the nip 54. The wings 32, 36 and 34, 38, the clamping cylinders 20, 22 and the rocker seats 24, 26 absorb the force exerted by the ground material in the nip 54 on the rollers 12, 14, and ensure that the nip 54 does not change significantly during the grinding process.

In the Fig. 6 an operating state is shown in the millbase passes into the nip 54, which is greater than the nip and intended to be crushed. If a largest grain or foreign matter is very hard and can not be crushed by the rollers 12, 14, the distance between the rollers 12, 14 must be increased, for example, to avoid damage to the rollers 12, 14. For this purpose, the clamping cylinder 20, 22 are deflected, ie extended to let the material too large or too hard to pass. The wings 32, 36 and 34, 38 are deflected in this case.

Each of the rockers 32, 34 and 36, 38 is capable of pivotal movement about an axis parallel to the roll axis. The pivotal movement about the axis parallel to the roll axis ensures that the distance between the rolls 12, 14 can be increased or decreased. While the ground material pushes the rollers 12, 14 outwardly from the grinding gap, the clamping cylinders 20, 22 provide a counter-directed force, so that the distance between the rollers 12, 14 remains almost the same.

Furthermore, each rocker 32, 34 and 36, 38 is able to rotate about its longitudinal axis or an axis parallel to its longitudinal axis. Here, the entire rocker 32, 34 and 36, 38 rotate as a rigid body about a rotation axis.

Finally, the wings 32, 34 and 36, 38 laterally elastically dodge or pivot about an axis perpendicular to the roll axis and its longitudinal axis.

The pan and rotation movements can occur here superimposed.

Since the rockers 32, 34 and 36, 38 are not rigid, but by means of a hinge connection with the foundation, in particular the swing seats 24, 26 are connected and beyond rotatable, optionally in itself rotatable, the wings 32, 34 and 36 respectively , 38 at least partially follow the bending of the roll axis due to a largest grain or foreign matter and thus absorb some of the forces that occur during the deflection of the rolls 12, 14. The force that occurs due to a roll deflection on the roller bearing between roller 12, 14 and rocker 32, 34 and 36, 38, is significantly reduced compared to a rigid connection between Rocker and foundation, where all the force that occurs due to a roll deflection, is transferred to the bearing between the rocker and roller.

Due to the fact that the rockers can twist in each case, the load on the corresponding bearings on the rollers or clamping cylinders is significantly reduced in comparison to conventional high-bed roller mills. An angular mobility of the roller bearings is therefore not necessary. As a result, the use of inexpensive cylindrical roller bearings is possible. On expensive spherical roller bearings can be omitted.

FIG. 7 shows a second embodiment of a high-bed roller mill 110 in a perspective view obliquely from above. In the FIG. 7 illustrated embodiment of a high-bed roller mill 110 differs from that in the FIGS. 1 to 6 illustrated embodiments of a high-bed roller mill 10 characterized in that the rockers and the foundation are designed differently.

In the case of the rockers 132, 134 and 136, 138 of the roller press 110, the two substantially C-shaped plate elements 140, 142 are connected to each other at least in sections at their rear side.

At the upper portion of the rocker, an upper swing arm 148 is provided, on which the respective clamping cylinders 120, 122 are arranged articulated.

The rocker receptacles 124, 126 each include a bottom plate 160 and two perpendicular to the bottom plate 160 spaced side walls 162, between which two opposite wings 132, 136 and 134, 138 rotatably mounted in the rocker seat 124, 126 about a lower pivot axis 146 are.

Furthermore, in each case a bore 164 are provided in the rocker arms 132 and 134 and in the rocker receptacles 124 and 126, through which a locking bolt 166 can be performed, so that in the in Fig. 7 illustrated embodiment, the left roller 114 is formed as a fixed roller and the right roller 112 as a Loswalze.

Operational experience with Gutbett roller mills have shown many times that the grinding surfaces of Loswalzen wear faster than those of the fixed rollers.

The FIG. 8 shows a third embodiment of a high-bed roller mill 210, which differs from the previously shown Gutbett roller mills in that both rollers 212, 214 can be used either as Loswalze or as a fixed roller. For this purpose, in addition to the bore 264 in the rocker seat 226 and the rocker 234 for receiving a locking bolt 264, a further bore 268 for receiving a locking pin in the rocker seat 226 and in the rocker 238 is provided.

In the illustrated embodiments, the two counter-rotating rollers are operated in a deep-rolling / idler-roller pairing. Alternatively, the good bed roller mill can be operated with the help of additional elements with two Loswalzen.

All embodiments have in common that due to the present leverage ratios of the illustrated good-bed roller mills 10; 110, 210 the force of the clamping cylinder is strengthened over a ratio of 2: 1.

Claims (11)

1. Material-bed roller mill comprising two rollers (12, 14; 112, 114; 212; 214) which are arranged so as to be adjacent, are oriented so as to be axis-parallel in a normal state and rotate in opposite directions, which rollers form a roll nip (54) therebetween, a base (11), two roller supports (28, 30), in each of which one roller (12, 14, 112, 114; 212, 214) is rotatably mounted, each roller support (28, 30) being pivotally fastened to the base (11), and a tensioning device which acts on the roll nip (54) and is arranged outside the roll nip (54) and interconnects both roller supports, each roller support (28, 30) comprising two rockers (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) which are formed as separate components, are each arranged on an end of a roller (12, 14, 112, 114; 212; 214) and can be independently deflected, characterised in that at least one rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) of a roller support (28, 30) is able to perform at least two of the following movements: pivoting movement about an axis parallel to the roller axis, rotary movement about the longitudinal axis of the rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238), rotary movement about an axis parallel to the longitudinal axis of the rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238), rotary movement about an axis perpendicular to the longitudinal axis of the rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238).
2. Material-bed roller mill according to claim 1, characterised in that at least one rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) of a roller support (28, 30) is able to perform a rotary movement about an axis perpendicular to the longitudinal axis of the rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) and perpendicular to the longitudinal axis of the roller (12, 14, 112, 114; 212, 214).
3. Material-bed roller mill according to either claim 1 or claim 2, characterised in that at least one rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) of a roller support (28, 30) is spherically mounted.
4. Material-bed roller mill according to any of the preceding claims, characterised in that the tensioning device comprises two tensioning units and each tensioning unit is connected to two opposing rockers (32, 34, 36, 38; 132, 134, 136, 138; 234, 238).
5. Material-bed roller mill according to any of the preceding claims, characterised in that at least one rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) is connected to the base (11) and/or the tensioning device by means of a hinge joint.
6. Material-bed roller mill according to any of the preceding claims, characterised in that the tensioning device comprises a tensioning cylinder (20, 22) and the connection points of the tensioning cylinder (20, 22) are rotatably fastened to the rockers (32, 34, 36, 38; 132, 134, 136, 138; 234, 238).
7. Material-bed roller mill according to any of the preceding claims, characterised in that the tensioning device comprises a tensioning cylinder (20, 22) and at least one end of the tensioning cylinder (20, 22) is detachably connected to a rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238).
8. Material-bed roller mill according to any of the preceding claims, characterised in that each rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) can be pivoted, relative to the base (11), from an operating position into a maintenance position.
9. Material-bed roller mill according to claim 8, characterised in that each rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) can be pivoted by at least 15°, preferably by an angle up to 90°, relative to the base (11).
10. Material-bed roller mill according to any of the preceding claims, characterised in that cylindrical roller bearings or sliding bearings are provided for mounting the rollers (12, 14; 112, 114; 212, 214) and/or the tensioning cylinders (20, 22; 120,122).
11. Material-bed roller mill according to any of the preceding claims, characterised in that each roller support comprises at least one receptacle for locking bolts (166; 264).

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