EP2988874B1 - Roll mill - Google Patents

Description

The invention relates to a roller mill with two arranged in a machine frame roller units, each having a rotatably mounted in two jewels bearing grinding roller, wherein the two grinding rollers are arranged opposite one another and each coupled to a drive for driving in opposite directions of the grinding rollers.

Between the machine frame and at least one roller unit, a Kraftbeaufschlagungssystem is provided for generating a grinding force, wherein the grinding force is transmitted via the machine frame consisting of several frame parts and the jewels on the grinding rollers. In this case, between at least two frame parts connected to one another and / or between a frame part and one of the bearing blocks, a detachable, positive connection with two mutually pressed connection surfaces for the transmission of the grinding force is provided.

Since the grinding rollers wear in operation, a regular roll change is required, in which the roller units are pulled out after the release of the connection between the grinding roller and drive from the machine frame. This roll change is required for good bed roller mills about 3 times a year and is each associated with a considerable amount of time, so opportunities were sought, as for example in the DE 10 2010 048 214 A1 are disclosed to accelerate the roll change.

Usually, in the connection of the frame parts of the machine frame positive connections in the form of round or flat feather key or bolt connections are used. When disassembling the connection between the pressure bar and an upper frame part (which is also referred to as top chord) and a lower frame part is released, so that the upper frame part can be raised and the pressure bar and the roller unit (s) can be pulled out. This disassembly process is still complex and time consuming.

An alternative possibility for time-saving assembly and disassembly of roller units is from the WO 2009/007197 A1 known. There, the pressure forces occurring during operation of the roller press are taken up by head pieces from the frame top and frame base. For mounting and dismounting of the roller units, the head pieces are displaced transversely to this with continuing support of the frame top.

In the WO 2007/137445 A1 and the US Pat. No. 3,828,515 Microforming coatings are disclosed to reduce relative movement between two components.

The DE 10 2010 048 214 A1 relates to a roller press with two mounted in a machine frame grinding rollers, wherein the machine frame has two tuning fork-shaped frame parts. To close the two tuning fork-shaped frame parts to the rear, it is provided that two closure elements are placed from above on the tuning fork-shaped frame components.

Further roller mills are from the US 2 2254 512 A and the US 2010/0243963 A1 known.

The invention has for its object to enable a faster disassembly and assembly of a roller unit.

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

The microforming coating has the advantage that the connecting surfaces only have to be raised a few millimeters in order to allow the withdrawal of the roller unit. Due to the microforming-generating coating, the transferable force is between The two connecting surfaces significantly increased, so that high grinding forces, for example, 16,000 kN and more, can be transmitted, as they occur, for example, in the case of high-pressure roller mills or roller presses in the cement and mineral area.

Further embodiments of the invention are the subject of the dependent claims.

According to a further embodiment of the invention, clamping means, for example in the form of a plurality of screw connections, are provided in order to press the two connection surfaces against one another

The connecting surfaces are preferably planar and the microforming-producing coating can be formed, in particular, by a hard-particle coating, the hard-material particles preferably having a Mohs hardness of from 6 to 10.

According to the invention, the roller mill is formed so that a roller unit is mounted as a Loswalze and the other roller unit as a fixed roller in the machine frame, wherein the Kraftbeaufschlagungssystem between the machine frame and acting as the Loswalze roller unit is arranged.

The machine frame is formed by at least one lower frame part, at least one upper frame part and a plurality of pressure bars connecting the upper and lower frame parts. In this case, the jewels can be slidably guided on the upper and lower frame part. The connecting surfaces are either formed on parts of the machine frame or the microformschlusserzeugende coating is applied to an intermediate member which is fixedly connected to the parts to be joined of the machine frame.

According to a first preferred embodiment of the roller mill four pressure bars are provided, wherein two pressure bars as an abutment of a roller unit and the other two pressure bars as abutment of the other Serve roller unit and the upper and lower frame part with the four pressure bars are connected by a releasable, positive connection with two mutually pressed connection surfaces, at least two of the pressed against each other connecting surfaces have the microforming-generating coating.

According to a second embodiment of the invention, only two pressure bars are provided, which are connected to the upper and the lower frame parts and serve as an abutment of acting as a Loswalze roller unit. The roller unit acting as a fixed roller is then connected via its bearing blocks with the upper and lower frame parts via the detachable, positive connection with two mutually pressed connection surfaces, wherein in turn at least one of the two pressed against each other connecting surfaces has the microforming-generating coating.

In the following the invention will be explained in more detail with reference to the following description of two embodiments and the drawing.

Fig. 1

eine dreidimensionale Darstellung einer Walzenmühle gemäß einem ersten Ausführungsbeispiel,

Fig. 2

eine Schnittdarstellung längs der Linie A-A der Fig. 6, die eine Seitenansicht der Fig. 1 darstellt,

Fig. 3

eine vergrößerte Ansicht des Details X der Fig. 2,

Fig. 4

eine Draufsicht der ersten Verbindungsfläche,

Fig. 5

eine Draufsicht der zweiten Verbindungsfläche,

Fig. 6

eine Seitenansicht der Fig. 1 in der Betriebsstellung der Walzenmühle,

Fig. 7

eine Seitenansicht der Walzenmühle mit demontiertem Druckbalken,

Fig. 8

eine Seitenansicht der Walzenmühle mit demontierter Walzeneinheit und

Fig. 9

eine dreidimensionale Darstellung einer Walzenmühle gemäß einem zweiten Ausführungsbeispiel.

In the drawing show

Fig. 1

3 shows a three-dimensional representation of a roller mill according to a first exemplary embodiment,

Fig. 2

a sectional view taken along the line AA of Fig. 6 which is a side view of Fig. 1 represents,

Fig. 3

an enlarged view of the detail X of the Fig. 2 .

Fig. 4

a plan view of the first connection surface,

Fig. 5

a plan view of the second connection surface,

Fig. 6

a side view of Fig. 1 in the operating position of the roller mill,

Fig. 7

a side view of the roller mill with dismantled pressure bar,

Fig. 8

a side view of the roller mill with disassembled roller unit and

Fig. 9

a three-dimensional view of a roller mill according to a second embodiment.

At the in Fig. 1 The roller mill illustrated is, for example, a roller press or a fine-bed roller mill with two roller units 2, 3 arranged in a machine frame 1, each having a grinding roller 20, 30, the grinding rollers being arranged opposite each other and each with a drive 4, 5 for driving the grinding rollers in opposite directions are coupled. The machine frame is composed of two lower frame parts 10, 11, two upper frame parts 12, 13 and four pressure bars 14 to 17 together. The grinding rollers 20, 30 are mounted on stub shafts 21 and 31 in bearing blocks 22, 23 and 32, 33, wherein the bearing blocks are slidably guided on the upper and lower frame parts 10, 11, 12, 13.

The roller unit 2 is held in the illustrated embodiment as a fixed roller in the machine frame 1 and is supported with its bearing blocks 22, 23 on the pressure bar 15, 17 from. The roller unit 3, however, is designed as a Loswalze. Between the machine frame 1 and the roller unit 3, a Kraftbeaufschlagungssystem 50 is provided for generating a grinding force, wherein the grinding force on the machine frame 1 and the jewels 22, 23 and 32, 33 is transferred to the grinding rollers 20, 30, wherein between the two grinding rollers Mahlspalt is maintained. In particular, pressures in the grinding gap of 50 MPa and more can be produced.

Based on FIGS. 2 to 5 The form-fitting connection of the lower and upper frame parts to the pressure bars of the machine frame 1 will be explained in more detail below. The pressure bars 14 to 17 are each connected to one of the lower frame parts 10, 11 and one of the upper frame parts 12, 13 via screw 6, 7 together. From the FIGS. 3 to 5 It can be seen that in this case provided on the pressure bar 15 first connection surface 15a against a provided on the upper frame part 12 second connection surface 12a is pressed. In order to increase the transmittable force between the pressure beam 15 and the upper frame part 12, one, but preferably both, of these connection surfaces 15a, 12a is provided with a microforming-producing coating 8, 9, for example, by a hard material particle coating having a Mohs hardness of 4 until 6 is formed. Preferably, all joints between the four pressure beams and the upper and lower frame members are formed in this manner.

The disassembly of a roller unit is based on the FIGS. 6 to 8 seen. Fig. 6 shows the roller mill in its operating position according to Fig. 1 , In a first step, the screw 6, 7 between the two pressure bars 15, 17 and the associated lower and upper frame parts are released. Furthermore, the coupling of the roller unit to be replaced must be released from its drive. In Fig. 2 this coupling point is provided with the reference numeral 40. In order to facilitate the extraction of the pressure bars 15, 17 and the roller unit 2, guide rails 18, 19 are provided in extension of the lower frame parts 10, 11.

After loosening the screw 6, 7, the two pressure bars 15, 17 are pulled out over the guide rails 18, 19. Under certain circumstances, it is expedient if the two upper frame parts 12, 13 are raised for this purpose by a few millimeters by means of a chain hoist or at least held. In the further sequence, the roller unit 2 is then completely pulled out. If necessary, then the other roller unit 3 is pulled out after releasing their connection to the drive 5. Installation is the reverse order.

In Fig. 9 a roller mill according to a second embodiment is shown, which differs from the first embodiment only in that the pressure bars 15, 17 have been omitted and the jewels 22, 23 are screwed directly to the lower and upper frame parts 10, 12 and 11, 13.

The communicating portions of the first and second bonding surfaces are preferably at least 50%, most preferably at least 90%, covered with the microforming coating. The individual particles of the coating preferably have a longest extent of on average <2 mm. The coating can optionally be applied by gluing, sintering, painting, chemical processes, electroplating, suspension or flame spraying. It is also conceivable that the microforming-producing coating is not applied directly to the pressure bar or the lower or upper frame parts, but rather to intermediate elements which are each firmly connected to the pressure bars or frame parts.

The great advantage of the microforming-producing coating is, above all, that even a slight lifting off of the two connecting surfaces of a few millimeters is completely sufficient to pull out the pressure bars or the roller units. Nevertheless, this coating ensures adequate transfer of grinding forces across the machine frame. Furthermore, the production costs by the elimination of the usual passport joints is much lower and it results in a more compact design. The assembly of the machine frame is facilitated by the lower alignment effort, since in particular no Passkeilanfertigung on the site is required.

Claims (8)

1. Roll mill having two roll units (2, 3) which are disposed in a machine frame (1) and which comprise in each case one grinding roll (20, 30) which is rotatably mounted in two bearing blocks (22, 23, 32, 33), wherein

   - the two grinding rolls (20, 30) are disposed so as to be mutually opposite and are in each case coupled to a drive (4, 5) for driving the grinding rolls in a counter-rotating manner;

   - a force-impingement system (50) for generating a grinding force is provided between the machine frame (1) and at least one roll unit (3), wherein the grinding force is transmitted by way of the machine frame (1) and the bearing blocks (22, 23, 32, 33) to the grinding rolls (20, 30);

   - one roll unit (3) is mounted as a loose roll and the other roll unit (2) is mounted as a fixed roll in the machine frame (1), wherein the force-impingement system (50) is disposed between the machine frame (1) and the roll unit (3) that functions as the loose roll; and

   - the machine frame (1) is composed of a plurality of frame parts, specifically at least one lower frame part (10, 11), at least one upper frame part (12, 13), and four pressure beams (14 - 17) which connect the upper and the lower frame part, wherein two pressure beams (14, 16) serve as counter-bearings of the one roll unit (3), and the two other pressure beams (15, 17) serve as counter-bearings of the other roll unit (2);

   - the upper and the lower frame part (10, 11, 12, 13) are connected to the four pressure beams (14 - 17) by way of in each case one releasable form-fitting connection having two mutually compressed connection faces (15a, 12a) for transmitting the grinding force;

   characterized in that

   - at least two of the mutually compressed connection faces comprise a micro-form-fit generating coating (8, 9); and

   - the form-fitting connection of the mutually connected frame parts is completely cancelled by mutually raising the two connection faces by at most 4 mm.
2. Roll mill having two roll units (2, 3) which are disposed in a machine frame (1) and which comprise in each case one grinding roll (20, 30) which is rotatably mounted in two bearing blocks (22, 23, 32, 33), wherein

   - the two grinding rolls (20, 30) are disposed so as to be mutually opposite and are in each case coupled to a drive (4, 5) for driving the grinding rolls in a counter-rotating manner;

   - a force-impingement system (50) for generating a grinding force is provided between the machine frame (1) and at least one roll unit (3), wherein the grinding force is transmitted by way of the machine frame (1) and the bearing blocks (22, 23, 32, 33) to the grinding rolls (20, 30);

   - one roll unit (3) is mounted as a loose roll and the other roll unit (2) is mounted as a fixed roll in the machine frame (1), wherein the force-impingement system (50) is disposed between the machine frame (1) and the roll unit (3) that functions as the loose roll;

   - the machine frame (1) is composed of a plurality of frame parts (10, 11, 12, 13), specifically at least one lower frame part (10, 11), at least one upper frame part (12, 13), and two pressure beams (14 - 17), wherein the two pressure beams (14, 116) are connected to the upper and the lower frame part (10 - 13) and serve as counter-bearings of the roll unit (3) that functions as the loose roll;

   - wherein between at least two mutually connected frame parts, and/or between at least one frame part and one of the bearing blocks, a releasable form-fitting connection having two mutually compressed connection faces (15a, 12a) is provided for transmitting the grinding force;

   characterized in that

   - the roll unit (2) that functions as the fixed roll, having the bearing blocks (22, 23) associated therewith, is connected to the upper and the lower frame part (10 - 13) by way of the releasable form-fitting connection having two mutually compressed connection faces (15a, 12a);

   - wherein at least one of the two mutually compressed connection faces (15a, 12a) comprises a micro-form-fit generating coating (8, 9); and

   - the form-fitting connection of the frame part (10, 11, 12, 13) and the bearing block (22, 23) is completely cancelled by mutually raising the two connection faces by at most 4 mm.
3. Roll mill according to Claim 1 or 2, characterized in that tensioning means for mutually compressing the two connection faces (15a, 12a) are provided.
4. Roll mill according to Claim 3, characterized in that the tensioning means are formed by a multiplicity of screw connections (6, 7).
5. Roll mill according to Claim 1 or 2, characterized in that the two connection faces (15a, 12a) are configured so as to be planar.
6. Roll mill according to Claim 1 or 2, characterized in that the micro-form-fit generating coating (8, 9) is formed by a hard-material particle coating.
7. Roll mill according to Claim 1 or 2, characterized in that the bearing blocks are guided so as to be displaceable in a sliding manner on the upper and the lower frame part (10, 11, 12, 13).
8. Roll mill according to Claim 1 or 2, characterized in that at least one of the connection faces having the micro-form-fit generating coating (8, 9) is applied to an intermediate element.

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