EP3313576A1

EP3313576A1 - Material-bed roller mill

Info

Publication number: EP3313576A1
Application number: EP16736390.2A
Authority: EP
Inventors: Dirk Hoffmann; Ralf Frankenberger; Hardy Lessmeister; Lukas SCHMITT; Karl-Heinz Schütte
Original assignee: Gebr Pfeiffer Se
Current assignee: Gebr Pfeiffer Se
Priority date: 2015-06-23
Filing date: 2016-06-15
Publication date: 2018-05-02
Anticipated expiration: 2036-06-15
Also published as: EP3313576B1; CN107820448A; DE102015110033A1; BR112017023727A2; BR112017023727B1; CN107820448B; WO2016207039A1; US11007533B2; DK3313576T3; JP2018518364A; US20180272355A1; JP6749350B2; TR201906052T4

Abstract

The invention relates to a material-bed roller mill comprising the following: two adjacently arranged rollers (12, 14; 112, 114; 212; 214) which are oriented in an axially parallel manner in a base state and rotate in opposite directions and between which a roller gap (54) is formed; a foundation (11); two roller mountings (28, 30), in each of which a roller (12, 14, 12, 114; 212, 214) is rotatably mounted, each roller mounting (28, 30) being secured to the foundation (11) in a pivotal manner; and a clamping device which acts on the roller gap (54) and which is arranged outside of the roller gap (54) and connects the two roller mountings together. Each roller mounting (28, 30) has two rockers (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) which are designed as separate components and each of which is arranged at an end of a roller (12, 14, 112, 114; 212, 214) and can be deflected independently of the other.

Description

"High pressure grinding roll"

Description: Technical area:

The present invention relates to a high-bed roll mill comprising two

juxtaposed, in a ground state axially parallel aligned and counter-rotating rollers forming 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 good bed roller mill is a nip or

Mahlspalt 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 with very high forces radially in the direction of

Roll gap are pressed so that the desired Gutbettzerkleinerung 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 crushing the material to be ground is applied to the idler roll by way of articulated hydraulic cylinders

applied. 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, in order to jamming in the roller guides

avoid.

Another type of execution of a good-bed roller mill on the principle of

Circular sheet guide, as known from the documents DE 1 927 164 A1 and US 4154408 A, although has a comparatively simple frame construction, but the grinding gap opens in parallel, regardless of where the oversize or hard grinding material 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 very hard material to grind and thereby a simple

Construction, in particular has 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 good-bed roller mill, comprising two juxtaposed, axially parallel aligned in a ground state 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 attached to the foundation, and a nip acting on the tensioning device, which is arranged outside the nip and connects both roll holders together, each roll holder two Swing, which are formed as separate components, each disposed 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 has a comparatively small size

Footprint needed. 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. This allows the clamping cylinder even without complex joints in

Cylinder inside are executed.

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.

Attachments, such as gearbox, can during Ausklappvorgang in the

Devices are stored. 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:

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

Fig. 1 is a good-bed roller mill in a perspective view according to a first

embodiment,

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

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

Fig. 4, the high-bed roll mill according to the first embodiment in a

Maintenance position

Fig. 5, the high-bed roller mill according to the first embodiment from above

Initial position,

6 shows the high-pressure roller mill from above with foreign body passage,

Fig. 7 is a good-bed roller mill in a perspective view according to a second

Embodiment, and Fig. 8 is 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 1 1 comprises two parallel and spaced strip-shaped

Swing shots 24, 26, which are aligned substantially perpendicular to the axis of the rollers 12, 14. On the foundation 1 1 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 elements 40, 42 which are arranged parallel and spaced 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 swing axle 44 and a lower swing axle 46 (see FIG. 3).

In the rocker seats 24, 26 holes are provided through which passes through the lower rocker axis 46. As a result, a hinge connection between the foundation, in particular the swing seat 24, 26 with the corresponding

Swing 32, 34, 36, 38 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 can be seen in particular in FIG. 2, each form a rocker receptacle 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 are the

Clamping cylinder 20, 22 away from the wings 32, 34, 36, 38. 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.

As particularly shown in FIG. 4, the rockers 32, 34, 36, 38 by a large angle, in particular by an angle> 15 °, preferably up to an angle of 90 °, relative to the rocker seat 24, 26 are pivoted.

Fig. 5 shows the high-bed roll 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. FIG. 6 shows an operating state in which the grinding stock passes into the nip 54, which is larger than the nip and intended to be comminuted. 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 body and thus a portion of the forces in the

Deflection of the rollers 12, 14 occur, record. 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, in which the entire force due to a

Roll deflection occurs, is transmitted 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 roll mill 110 in a perspective view obliquely from above. The embodiment of a high-bed roller mill 1 10 shown in FIG. 7 differs from the embodiments of a high-bed roller mill 10 illustrated in FIGS. 1 to 6 in that the rockers and the foundation are designed differently.

In the rockers 132, 134 and 136, 138 of the roller press 1 10, the two substantially C-shaped plate members 140, 142 are at least partially connected to each other at its 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 rockers 132, 136 and 134, 138 in the

Swing mount 124, 126 are rotatably mounted about a lower rocker axis 146.

Furthermore, in the rockers 132 and 134 and in the rocker seats 124 and 126 each have a bore 164 is provided through which a locking bolt 166 is feasible, so that in the embodiment shown in Fig. 7, the left roller 1 14 as

Hard roller and the right roller 1 12 is designed as a Loswalze.

Operating experience with Gutbett roller mills have shown many times that the

Wheel surfaces of idler rollers wear faster than those of the fixed rollers.

FIG. 8 shows a third embodiment of a good-bed roller mill 210, which differs from the previously described good-bed 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; 1 10, 210 the strength of the clamping cylinder is increased over a ratio of 2: 1.

Claims

claims:

1 . Good-bed roller mill comprising two juxtaposed, in one

Ground state axially parallel aligned and counter-rotating rollers (12, 14, 1 12, 1 14, 212, 214), which form between them a nip (54), a

Foundation (1 1), two roll holders (28, 30), in each of which a roller (12, 14, 1 12, 1 14; 212, 214) is rotatably mounted, each roller holder (28, 30) pivotally mounted on the foundation (1 1), and a tensioning device acting on the nip (54), which is arranged outside the nip (54) and connects both roll holders, each roll holder (28, 30) having two rockers (32, 34, 36, 38; 132, 134, 136, 138; 234, 238), which are formed as separate components, each at one end of a roller (12, 14, 1 12, 1 14; 212, 214) and are independently deflectable, characterized in that at least one rocker arm (32, 34, 36, 38, 132, 134, 136, 138, 234, 238) of a roll support (28, 30) is capable of performing at least two of the following movements: pivotal movement about one Axle parallel to the roll axis, rotational movement about the longitudinal axis of the rocker (32, 34, 36, 38, 132, 134, 136, 138, 234, 23 8), rotational movement about an axis parallel to

Longitudinal axis of the rocker (32, 34, 36, 38, 132, 134, 136, 138, 234, 238),

Rotational movement about an axis perpendicular to the longitudinal axis of the rocker (32, 34, 36, 38, 132, 134, 136, 138, 234, 238).

2. A high-bed roll mill according to claim 1, characterized in that at least one rocker (32, 34, 36, 38, 132, 134, 136, 138, 234, 238) of a roll holder (28,30) is capable of one Rotary movement about an axis perpendicular to

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, 1 12, 1 14, 212, 214) to perform.

3. Good-bed roller mill according to claim 1 or 2, characterized in that

at least one rocker (32, 34, 36, 38, 132, 134, 136, 138, 234, 238) of a roller holder (28, 30) is mounted spherically.

4. Good-bed roller mill according to one of the preceding claims, characterized

characterized in that the tensioning device comprises two tensioning units and each tensioning unit is connected to two opposite rockers (32, 34, 36, 38; 132, 134, 136, 138; 234, 238).

5. Good-bed roller mill according to one of the preceding claims, characterized in that at least one rocker (32, 34, 36, 38, 132, 134, 136, 138, 234, 238) by means of articulation with the foundation (1 1) and / or the

Clamping device is connected.

6. Good-bed roller mill according to one of the preceding claims, characterized

in that the tensioning device comprises a tensioning cylinder (20, 22) and the attachment points of the tensioning cylinder (20, 22) are rotatably mounted on the rocker arms (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) ,

7. Good-bed roller mill according to one of the preceding claims, characterized

in that the tensioning device comprises a tensioning cylinder (20, 22) and releasably connects at least one end of the tensioning cylinder (20, 22) to a rocker (32, 34, 36, 38; 132, 134, 136, 138; 234, 238) is

8. Good-bed roller mill according to one of the preceding claims, characterized

characterized in that each rocker arm (32, 34, 36, 38, 132, 134, 136, 138, 234, 238) is pivotable relative to the foundation (11) from an operating position to a service position.

9. Good-bed roller mill according to claim 8, characterized in that each

Swing arm (32, 34, 36, 38, 132, 134, 136, 138, 234, 238) by at least 15 °, preferably by an angle up to 90 ° relative to the foundation (1 1) is pivotable.

10. Good-bed roller mill according to one of the preceding claims, characterized

in that cylindrical rollers or plain bearings are provided for supporting the rollers (12, 14, 12, 14, 212, 214) and / or the clamping cylinders (20, 22, 120, 122).

1 1. Good-bed roller mill according to one of the preceding claims, characterized

in that each roller holder has at least one receptacle for

Locking bolt (166; 264) has.