JP7321153B2 - roller lever module - Google Patents

Description

The present invention relates to a roller lever module for the grinding rollers of a roller mill with a rotating grinding table and grinding rollers rolling thereon. The roller lever module has a roller lever, and a crushing roller can be attached to one of its ends on the crushing table side. Furthermore, a guide and support unit with guide shafts is provided. The roller lever is connected on the side facing away from the grinding table to a guide and support unit, which is formed as a linear guide that moves the roller lever axially along the guide shaft. .

Roller mills are used to grind all kinds of materials. It is customary to provide a rotatable grinding table on which a fixed, rotatable grinding roller rolls. The rollers do not need to be driven and are often set in rotation by the action of the material to be ground lying on the grinding table. Since the material to be ground does not form an ideal grinding bed on the grinding table, it is necessary for the grinding rollers to be able to vary their distance from the grinding table. Various configurations have been considered for this purpose. What is essential in this case is that the design allows an adequate degree of freedom of movement for the comminuting rollers. Such an arrangement is described as a roller lever module.

The crushing rollers themselves are each connected to a shaft which is supported in roller levers. The roller lever itself is connected to the roller lever module. This configuration is important so that the compensating movements described above can be carried out. Since vibrations also occur in the grinding process, it is also necessary to interrupt them, ideally by means of roller lever modules, and to damp them.

A configuration of a roller lever module is disclosed in Patent Document 1, for example. In this document, the roller lever is fastened to a fork-like device, thus permitting pivoting of the roller lever along an axis perpendicular to the pivot axis of the crushing roller.

International Publication No. WO2017/137056 pamphlet

A disadvantage of known systems is that they tend to be relatively large configurations. However, there is a trend in grinding technology towards larger and larger mills with multiple grinding rollers. There is therefore a desire to construct the roller lever module as compactly as possible and to arrange as many grinding rollers as possible around the grinding table in a space-saving manner.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to present a roller lever module with a compact construction.

This object is achieved according to the invention by a roller lever module with the features of claim 1 .

Successful embodiments of the invention are shown in the dependent claims, the description and the drawings and their description.

In the case of the roller lever module according to the invention, it is further developed, as suggested, in that the guiding and supporting unit has a central body elongated in the direction along the guide axis, which central body is enclosed by an outer sleeve.

The outer sleeve is arranged on and/or mounted on the central body for movement along the guide axis. At least one linear guide bearing is provided between the outer sleeve and the central body. Furthermore, a unit for transmitting torque from the roller lever to the central body is arranged between the outer sleeve and the central body.

The invention is based on the idea of distributing the forces acting on the grinding rollers and thus on the roller levers over different units. The roller lever module basically consists of loads due to the roller forces, i.e. due to the pressure with which the grinding rollers press against the material to be ground on the grinding table, and loads originating from the bowl rotation, i.e. above all due to the rotation of the bowl. It must be suitable to absorb the torques transmitted through the material to be milled to the grinding rollers and thus to the roller levers. In the present invention, two separate devices are provided for absorbing and transmitting the associated loads.

Forces and loads resulting from the pressure of the grinding roller itself are absorbed and transmitted inter alia by at least one linear guide bearing. This force is ultimately absorbed in the elongated central body and released into the foundation via brackets provided for that purpose. Forces emanating from the bowl rotation, in particular torques, are transmitted to the central body via said torque transmission unit. These two arrangements of force transmission units allow the guide and support unit to be implemented in a particularly compact and narrow manner. This is also supported by arranging both the at least one linear guide bearing and the torque transmission unit between the outer sleeve enclosing the central body and the central body.

Furthermore, the at least one linear guide bearing makes it possible to move the roller lever and thus the crushing roller connected thereto along the guide shaft. Thus, on the one hand, irregularities on the grinding bed can be smoothed out. On the other hand, the grinding gap, ie the standard distance between the grinding roller and the grinding table, can also be set accordingly. This is useful, for example, if you want to grind another material.

In general, any kind of bearing can be used as a linear guide bearing. However, it is advantageous to use hydrostatic bearings for that purpose. The high power density of hydrostatic bearings facilitates compact construction of the roller lever module.

In principle, it is sufficient to use only one linear guide bearing. However, it is desirable to have more than one guide bearing. For example, at least one first linear guide bearing and at least one second linear guide bearing, preferably formed as a hydrostatic bearing, can be provided. In this case, the first linear guide bearing can be arranged in the upper region of the central body and the second linear guide bearing in the lower region of the central body. An arrangement of this kind promotes good transmission of the forces emanating on the roller lever to the central body.

Also, in this arrangement, the torque transmission unit is arranged between the at least one first linear guide bearing and the at least one second linear guide bearing. In this embodiment, also in other embodiments with, for example, one linear guide bearing or three, four or more guide bearings, the torque transmission unit can be arranged centrally.

In general, the torque transmission unit can be formed in any manner. One option is to implement this as a curved tooth coupling. In this case the parts of the curved toothed coupling, eg the teeth, can be formed on the central body. In this connection it is also possible to provide an inner sleeve which encloses the central body. It can be placed on the central body in a torque proof manner. In a configuration of this kind, the counterparts of the curved-tooth coupling can also be formed on the inner sleeve instead of the central body. This provides the advantage that if the inner sleeve becomes damaged it can be replaced while still using the central body.

Among the other parts of the curved tooth coupling, those parts capable of meshing or engaging with teeth provided on the central body or on the inner sleeve are also on the outer sleeve, in this case especially on the inner side of the outer sleeve. provided accordingly.

Since the outer sleeve can be moved along the guide axis but not the inner sleeve and the central body, the extension along the guide axis of the tooth or meshing portion on the inner sleeve or on the central body is replaced by the tooth or mesh formed on the inside of the outer sleeve. It is desirable to make it longer than that of the part.

In general, there is also the option of implementing the torque transmission unit as a correspondingly arranged and dimensioned hydrostatic bearing. The advantage of using curved tooth couplings is that they are of smaller size construction and can be easily integrated into roller lever modules of compact dimensions.

As already mentioned, the linear guide bearings can be formed as hydrostatic bearings. In this case, the hydrostatic bearing can be provided with a bearing bushing having an inner diameter substantially corresponding to the outer diameter of the central body or inner sleeve. Various elements can be provided on, formed on or within the bearing bushing to achieve or optimize the hydrostatic bearing.

The bearing bushing can then have lubricant supply ducts along the radial direction. Likewise, a lubricant return duct can be provided along the axial direction on the bearing bushing. Additionally, a pressure pocket can be formed inside the bearing bushing. Each of these designs can be provided separately or in combination.

Preferably, the lubricant supply duct extends radially through the bearing bushing and serves to supply lubricant from the exterior to the interior of the bearing bushing. The supplied lubricant can then flow upwards or downwards inside the bearing bushing through axially arranged lubricant return ducts. A pressure pocket provided inside the bearing bushing can be used to at least temporarily receive lubricant. Lubricant either flows through the lubricant supply duct into the pressure pocket and stays there, or a volume is carried away through the lubricant return duct while substantially the same volume flows through the lubricant supply duct. It is continuously exchanged in the state of being supplied.

In one successful embodiment, the outer sleeve-centerbody space is filled with a lubricant. When the inner sleeve is provided, the empty space is located between the outer sleeve and the inner sleeve. The space left unoccupied by members after the arrangement of one or more linear guide bearings and torque transmission units can be referred to as free space. Providing this empty space and filling it with lubricant contributes to good lubrication of the components located therein, thus supporting the life of the roller lever module construction.

The upper end of the roller lever module may be provided with a lubricant extraction mechanism. Especially when hydrostatic bearings are used, ideally there is a continuous supply of lubricant, so that it becomes necessary to carry off the supplied lubricant again. Locating the lubrication extraction mechanism in the upper end region of the present roller lever module is beneficial to ensure that a sufficiently high lubrication level can be developed in the empty space mentioned above. However, it is also possible to provide a lubrication extraction mechanism in the lower area or in the lateral area of the roller lever module.

Exceptionally reliable operation can be achieved with the roller lever module when ambient pressure substantially prevails in the empty space. This means that the lubricant present in the free space is not under pressure, but is exclusively pumped via the lubricant extraction mechanism arranged in the upper region and extracted there, which for example in particular It is done at the same volume per unit time as it is supplied near the hydrostatic bearing.

Sealing of the free space in the roller lever module can be achieved, for example, by providing piston ring seals in its upper and lower regions.

Preferably, the roller lever with the shaft of the grinding roller is mounted on the outer sleeve. This type of mounting can also be of relatively compact construction.

Hydraulic cylinders can be provided on the grinding roller levers in order to exert additional pressure on the grinding rollers and thus on the material to be ground. It is preferably oriented in a direction of compression or retraction which is substantially parallel to the central body or guide axis of the guide and support unit.

The comminution roller lever module according to the invention is preferably used in a roller mill having a comminution table and a comminution roller rolling thereon. A grinding roller lever module is provided here for each grinding roller. This roller lever module can also generally be referred to as a crushing roller lever module.

Due to the compact construction of the crushing roller lever module according to the invention, two crushing roller lever modules can be provided on a common stand, which can be made of concrete for example. This allows for a relatively compact configuration around the roller mill, thus leaving sufficient space for other equipment required for operation.

The invention is explained in more detail below by means of schematic exemplary embodiments with reference to the enclosed drawings. The drawing shows:

1 shows the basic components of a roller mill with six roller lever modules according to the invention; FIG. Fig. 3 shows a stand with two roller lever modules according to the invention; 1 is a cross-sectional view of a roller lever module according to the invention; FIG. 1 is a perspective view of a bearing bushing of a hydrostatic bearing; FIG. FIG. 4 is a plan view of a bearing bushing of the hydrostatic bearing;

FIG. 1 shows a roller mill in a simplified representation, omitting the housing and classifier (classifier) and omitting other parts that are not material to the invention.

Here, three stands 102 are provided around a grinding table 101 placed in the center. Located on each of these stands 102 in each bearing block 30 are two roller lever modules 1 according to the invention, also called roller bearing modules.

The layout can also be such that there is one bearing block per roller lever module. In that case, the determined bearing block can be provided on a common stand together with the second bearing block, or it can be provided on a separate stand.

The roller lever module 1 essentially consists of a roller lever 3 and a guide and support unit 20 . The crushing roller 10 is provided at the end of the roller lever 3, on the side of the crushing table. It is connected in a torque proof manner to a shaft which runs inside the roller lever 3 . In the form shown here, the grinding table 101 is depicted exclusively as a ring. In a non-simplified view of the roller mill, this will generally be a substantially circular disk.

During operation, the grinding table 101 is set to rotate. The material to be crushed placed thereon is directed against the crushing roller 10 by the action of centrifugal force and is thereby carried outward. On the one hand, the material to be crushed carried under the crushing rollers 10 is crushed by the pressure exerted by the crushing rollers 10 on the material to be crushed. On the other hand, contact with the material to be crushed ensures that the crushing rollers 10 rotate about their own shafts.

FIG. 2 shows an enlarged representation of the stand 102 with two roller lever modules 1 . Each roller lever module 1 has its own bearing block 30 . A guiding and supporting unit 20 of each roller module 1 is fitted into it.

A guide and support unit 20 to which the roller lever 3 is mounted allows a linear movement of the grinding roller 10 perpendicularly to the grinding table 101 .

A detailed configuration of the guide and support unit 20 will be described later in detail with reference to FIG.

A fluid pressure cylinder 5 is provided between the stand 102 and the roller lever 3 . In its effect the force, ie the force exerted by the grinding roller 10 on the grinding bed on the grinding table 101, can be varied. When the hydraulic cylinder 5 pulls, this force can be strengthened, and when pushed, the force can be weakened. More specifically, an increase in fluid pressure on the piston rod side leads to an increase in pulling force on the piston rod. A drop in fluid pressure at the piston rod, along with a weakening of its force, leads to an increase in fluid pressure in the piston-side cylinder chamber, which is lower in this view. This leads to roller lifting if the applied force exceeds the weight of the moving system.

FIG. 3 shows the cross-sectional appearance of the guide/support unit 20 of the roller lever module 1 according to the present invention. A central body 22 of cylindrical form extends inside the guiding and supporting unit 20 . An inner sleeve 25 is provided around the central body 22 . It is preferably connected to the central body 22 in a torque proof manner. An outer sleeve 24 is arranged around the inner sleeve 25 . Formed outside the inner sleeve 25 and inside the outer sleeve 24 are portions of a curved tooth coupling 28 which serve to transmit torque from the roller lever 3 . Outer sleeve 24 is preferably mounted for linear movement in the axial direction of central body 22 .

As shown in FIG. 3, the larger areas of the curved tooth coupling are formed on an inner sleeve 25 fixedly mounted on the central body 22 . The smaller portions, ie the portions that engage and interlock with areas on the inner sleeve 25 are provided on the outer sleeve 24 . As the outer sleeve 24 moves linearly, the movement of those parts will be in the parts provided on the inner sleeve 25, so that force and torque transmission will continue to be possible.

Hydrostatic bearings 28 are arranged in the upper and lower regions of the guide and support unit 20, respectively. It extends between the outer sleeve 24 and the inner sleeve 25 . A withdrawal point 36 is provided in the contact area between the outer sleeve 24 and the inner sleeve 25, at which the introduced lubricant for the hydrostatic bearing 28 can be drawn off again.

The lower contact point between the outer sleeve 24 and inner sleeve 25 is provided with a seal, e.g. can be removed exclusively. A similar seal can be provided at the upper contact point between the outer sleeve 24 and inner sleeve 25, or even on the contact surface thereof.

The roller lever 3 itself is mounted on the outer sleeve 24 .

A hydrostatic bearing 26 and curved tooth coupling 28 allow the roller lever 3 to move upward and downward along the central axis of the central body 22 and inner sleeve 25 .

4 and 5, the construction of the hydrostatic bearing 26 is seen more closely. It consists essentially of a bearing bushing 42 . The inner diameter of the bearing bushing 42 substantially corresponds to the outer diameter of the inner sleeve. A radially extending lubricant supply duct 44 is provided in the bearing bushing 42 . A lubricant return duct 46 formed along the axial direction has the function of allowing the lubricant supplied through the lubricant supply duct 44 to escape to the outside again. As shown in particular in FIG. 4, a pressure pocket 48 is provided between the lubricant return ducts 46, in which the lubricant ideally resides during operation, so that the hydrostatic bearing 26 carrying and guiding effects can be developed.

Located in the space between inner sleeve 25 and outer sleeve 24 is lubricant, which is supplied via lubricant supply duct 44 of hydrostatic bearing 26 . This lubricant has a damping effect on vibrations that cause the roller lever 3 to move up and down. This means that a roller mill with a roller lever module 1 according to the invention can run quieter and thus more efficiently.

Claims (16)

A roller lever module (1) for a grinding roller (10) of a roller mill comprising a rotating grinding table (101) and a rolling grinding roller (10) thereon, comprising:
a roller lever (3) to which the crushing roller (10) is attached at the end on the crushing table (101) side;
a roller lever module (1) comprising a guide and support unit (20) on which said roller lever (3) is mounted for linear movement of said roller lever (3) in a direction perpendicular to said grinding table (101); and
a cylindrical central body (22) in which said guiding and supporting unit (20) extends perpendicularly to said grinding table (101) ;
an outer sleeve (24 ) provided on the outer periphery of the central body (22) so as to wrap the central body (22) and having the roller lever (3) mounted on the outside thereof ;
provided between the outer sleeve (24) and the central body (22) to move the outer sleeve (24) along the central body (22) in a vertical direction with respect to the grinding table (101); at least one linear guide bearing ;
A torque provided between said outer sleeve (24) and said central body (22) for transmitting torque from said roller lever (3) mounted on said outer sleeve (24) to said central body (22). providing a transmission unit;
A roller lever module characterized by: A roller lever module (1) according to claim 1, characterized in that
The at least one linear guide bearing is
a hydrostatic bearing (26) comprising a cylindrical bearing bushing (42) with a pressure pocket (48) on its inner surface for at least temporarily receiving a lubricant and supporting said central body (22) in rotation via said lubricant; ) is formed as
A roller lever module characterized by: A roller lever module (1) according to claim 1 or 2, characterized in that
The torque transmission unit is provided in the center in the vertical direction of the central body (22),
It has at least a first linear guide bearing and a second linear guide bearing, said first linear guide bearing being arranged in the upper region of said torque transmission unit of said central body (22) and said second linear guide bearing being said Roller lever module, characterized in that it is arranged in the lower region of said torque transmission unit of the central body (22). A roller lever module (1) according to any one of claims 1 to 3,
The torque transmission unit is
formed as a curved tooth coupling (28) including first teeth provided on the outer surface of said central body (22) and second teeth provided on the inner surface of said outer sleeve (24) for engaging said first teeth; is being done,
A roller lever module characterized by: A roller lever module (1) according to claim 1 , characterized in that
said guiding and supporting unit (20) comprises an inner sleeve (25) fixed to the outer periphery of said central body (22) so as to enclose said central body (22);
The outer sleeve (24) is provided on the outer periphery of the inner sleeve (25) so as to wrap the inner sleeve (25), and the roller lever (3) is mounted on the outer side,
Said at least one linear guide bearing is provided between said outer sleeve (24) and said inner sleeve (25) to move said outer sleeve (24) along said inner sleeve (25) to said grinding table ( 101) in the vertical direction,
The torque transmission unit is provided between the outer sleeve (24) and the inner sleeve (25), and transmits torque from the roller lever (3) mounted on the outer sleeve (24) to the inner sleeve (25). and transmitting torque,
A roller lever module characterized by: A roller lever module (1) according to claim 5, characterized in that
The torque transmission unit is
formed as a curved tooth coupling (28) comprising a first tooth provided on the outer surface of said inner sleeve (25) and a second tooth provided on the inner surface of said outer sleeve (24) and engaging said first tooth; being
A roller lever module characterized by: A roller lever module (1) according to claim 2, characterized in that
The cylindrical bearing bushing (42) has an inner diameter corresponding to the outer diameter of the central body (22) and has a radially extending lubricant supply duct (44) and an axially extending lubricant supply duct (44). a lubricant return duct (46) , said lubricant return duct (46) extending the full axial length of said bearing bushing (42);
A roller lever module characterized by: A roller lever module (1) according to claim 5 or 6, characterized in that
Said at least one linear guide bearing comprises a cylindrical bearing bushing (42) with a pressure pocket (48) on its inner surface for at least temporarily receiving a lubricant through said inner sleeve (25). is formed as a hydrostatic bearing (26) that rotationally supports the
The bearing bushing (42) has an inner diameter corresponding to the outer diameter of the inner sleeve (25) and has a radially extending lubricant supply duct (44) and an axially extending lubricant return duct. (46), wherein said lubricant return duct (46) extends the full axial length of said bearing bushing (42);
A roller lever module characterized by: A roller lever module (1) according to any one of claims 1 to 4 and 7,
Roller lever module, characterized in that the empty space (27 ) between said outer sleeve (24) and said central body (22) is filled with a lubricant. A roller lever module (1) according to claim 5, 6 or 8, characterized in that
Roller lever module, characterized in that the free space (27) between said outer sleeve (24) and said inner sleeve (25) is filled with a lubricant. A roller lever module (1) according to claim 9 or 10 , characterized in that
Having a lubricant extraction mechanism (36) for removing lubricant from the empty space (27) by pumping ;
A roller lever module characterized by: A roller lever module (1) according to any one of claims 1 to 4 and 7,
a piston seal (34) hermetically sealing said outer sleeve (24) to said central body (22) ;
A roller lever module characterized by: A roller lever module (1) according to claim 5, 6 or 8, characterized in that
comprising a piston seal (34) hermetically sealing said outer sleeve (24) to said inner sleeve (25);
A roller lever module characterized by: A roller lever module (1) according to any one of claims 1 to 13 ,
connecting between a stand (102) on which said guiding and supporting unit (20) is mounted and said roller lever (3), to absorb the force exerted by said grinding roller (10) on said grinding table (101); comprising a variable hydraulic cylinder (5);
A roller lever module characterized by: a roller mill comprising said grinding table (101) and said grinding roller (10) rolling thereon,
Roller mill, characterized in that it comprises at least one roller lever module (1) according to any one of the preceding claims. 16. The roller mill of claim 15, wherein
Roller mill comprising a concrete common stand (102) on top of which two roller lever modules (1) according to any one of claims 1 to 14 are mounted.

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