EP3552708A1 - Roller grinder and roller turning system for a roller grinder - Google Patents

Abstract

The invention relates to a roller mill for grinding coarse ceramic materials and a roller turning system for use in such a roller mill. The roller mill comprises a machine frame (1), two rollers (2, 3) rotatably mounted on the machine frame (1) and a roller turning system for turning the surface of the rollers (2, 3). The roller turning system has exactly two base units (4, 5) each with a guide system (6), with one base unit (4, 5) being fixedly mounted on the machine frame (1) in the area of each roller (2, 3). The roller turning system also comprises only one support unit (7) and only one drive unit (8), which are designed in a modular manner for mutual mounting on one of the two base units (4, 5) and also for dismantling therefrom.

Description

The invention relates to a roll mill and a roll turning system for such a roll mill.

In the heavy clay industry, roll mills are used for processing clays. In the process, the coarse raw material is crushed to a grain size of up to 0.5 mm between two counter-rotating roll shells and thereby finely ground. Between the roller shells remains a gap whose gap width is adjustable. For this purpose, a fixedly mounted on the machine frame, referred to as a fixed roller roller and a relatively movable, designated as a Loswalze roller are provided as a rule. The grain size of the milled material is adjusted across the gap width.

In the raw material, various hard materials, e.g. Quartz, lime, pyrite, etc. included. These hard materials lead to wear of the roll shells. The wear is not uniform across the width of the roll mantles, but local leaching occurs and, consequently, an uneven nip along the roll mantles. However, a non-uniform gap along the width of the roll shells is the cause of an inhomogeneous quality of the clay material with regard to its degree of preparation.

If now the wear pattern or the furrow formation on the roll shells exceeds a tolerable level, the roll shells are using a Rolling lathe turned over, so that the desired cylindrical shape is restored. After overwinding the idler roller is approximated, for example via a swing mechanism of the hard roller, whereby again a constant and defined nip is achieved.

Such roller lathes are similar in structure to the usual, universally used lathes, as components of a base unit with a console and a guide system, a movable on the guide system support unit with a turning tool support and a drive for the feed movement in particular in the longitudinal direction, ie axially parallel to the roll shell exhibit.

All components, ie console, guide system, support unit and drive form a unit which can not be separated under operating conditions. The total unit of the roll lathe has a weight of several hundred kilograms. Therefore, and due to the installation situation at the end customer with conveyor belts for the material supply, it is neither practical nor practicable to dismantle the roll lathe for the actual ordinary milling process from the rolling mill. For the same reasons, it is not practicable to provide for a rolling mill, only a single roll lathe and use this for turning off both roll coats. Consequently, the roll mills according to the prior art each have a roll turning system, which always comprises two complete roll lathe machines per roll mill, and one of which is always permanently mounted in the region of one roll. Accordingly, a high investment cost with disadvantages for the economy is required.

The above also leads to technical problems. The grinding process is connected with partly strong vibrations. In conjunction with the heavy and the above-mentioned fixed-mounted design thereby the mechanical components, in particular the precise guides of the roll turning machines are strong which leads to damage over a longer period of time. In order to counteract this cause of damage, the mill lathe can be decoupled in the milling process compared to the rolling mill with various vibration damping systems. However, such a vibration damping system must be put out of service for twisting the roll shells to ensure the required accuracy in this step. If the operator forgets to put the decoupling system back into operation after turning off, the roller lathe will be damaged very quickly due to vibrations in the grinding process.

The invention has for its object to simplify a generic roller mill and thereby increase their reliability.

This object is achieved by a roller mill with the features of claim 1.

A further object of the invention is to develop a generic roll-turning system such that reduced damage sensitivity is achieved with reduced system complexity.

This object is achieved by a roller turning system with the features of claim 8.

According to the invention, a roller mill and a corresponding roller-turning system are provided, wherein the roller-turning system has exactly two base units, each with a guide system. The one base unit is permanently mounted on the machine frame in the area of one roller each. The roll-turning system further comprises only one support unit and only one drive unit, which are designed in a modular manner for mutual mounting on one of the two base units and also for disassembly thereof.

First, it should be noted that the rolling lathe system according to the invention requires fewer components, namely with only one support unit instead of two, and with only one drive unit instead of two. Accordingly, the initial capital expenditure is significantly reduced. Further, the demountable components, that is, the support unit and the drive unit are small and lightweight compared to a complete roll lathe, so that they can be easily handled by an operator. Assembly and disassembly are easily possible under the cramped operating conditions between rolling mill and conveyor belts. Consequently, during grinding, only the two base units remain on the machine frame, while the support unit and the drive unit are disassembled. The absence of their mass causes the guide systems to experience significantly reduced reaction loads under the vibration load of the milling operation. This in turn allows a less powerful dimensioning, which on the one hand also contributes to relieving the vibration stress and on the other hand allows a more cost-effective structure. In particular, however, the previously observable vibration-related damage patterns are eliminated or at least considerably reduced. Follow-up costs due to spare parts, maintenance and production downtime have been reduced. In addition, can be dispensed with a vibration damping system including its operating costs and its risk of error.

In occasionally required maintenance, the two roll shells are turned off sequentially. First, the support unit and drive unit are mounted on one of the two base units. As a result, a complete roller turning machine is formed, with which the first roll shell is turned off. Subsequently, the support unit and the drive unit are converted from the first base unit to the second base unit, thereby completing a second roller turning machine. As soon as hereby the second roll shell is turned off, a disassembly of support unit and drive unit. On the machine frame remain only the two base units. After finally, the gap between the two freshly turned off rolls was readjusted, the roll mill is back in ready for operation. The grinding operation is continued, and all components of the rolling lathe system according to the invention are further protected against the inevitable vibration loads.

It is also no disadvantage for the operator of a brickwork that the two roller shells can not be turned off at the same time. As a rule, material processing is carried out in just one working shift. This is followed by a raw material buffer in which the raw material remains for up to four weeks for natural homogenization. Clay is a natural product, and its post-treatment storage increases raw material quality. Only after the storage process, the raw material goes into the shape in which building bricks, roof tiles or similar ceramic products are produced in two- or three-shift operation. The additional time required for the sequential twisting off of both roll shells does not therefore affect the actual production process in the shaping.

In a preferred embodiment, the guide system is formed from linear guides with linear rails and linear carriage, wherein the linear rails are releasably secured. As linear guides are referred to such guides in which a linear carriage rolls by means of a rolling bearing, in particular in the form of a recirculating ball bearing on the associated linear rail. Such linear rails are compared to slides easier and smoother. As a result of the above-mentioned reduction of the registered vibration loads according to the invention, they can be used despite limited carrying capacity. In case of damage that may nevertheless occur, linear rails and linear carriages can be easily exchanged.

Alternatively, it may be appropriate that the guide system is formed of flat and prismatic guides with a flat rail, with a prism rail and with sliding guides, wherein the flat rail and / or the prism rail is releasably secured. Load capacity and rigidity of the flat and prismatic guides are compared to Linear guides higher, so they can be given the appropriate operating loads preference. However, deviating from the prior art, but provided here releasable attachment of the flat rail or the prism rail, however, allows in the event of damage occurring easy interchangeability.

An advantageous possibility is to attach the guide system directly to the machine frame. In a preferred embodiment, the base unit comprises a bracket for receiving the guide system and for releasable attachment to the machine frame. This allows on the one hand to carry out preparatory activities such as the mutual alignment of all parts of the guide away from the roll mill alone on the console, in which case mur nor the ready prepared console is to be mounted as a complete assembly on the machine frame. On the other hand, this makes it easier to retrofit existing roll mills.

In an expedient development of the invention, the guide system has a guide carriage with a first adapter plate for detachably fastening the support unit, while the support unit is provided with a first counterplate corresponding to the first adapter plate. Adapter plate and back plate are coordinated so that a precise mutual position alignment and yet a slight mechanical separation are ensured by suitable means such as dowel pins, zero point clamping system or the like. Drive components or the like interlock precisely and without the need for adjustment. The guide system remains completely stationary including its linear carriage or its sliding guides on the associated base unit, so that no consideration must be given to the guide system during assembly or during disassembly. The same applies mutatis mutandis to such a preferred embodiment in which the guide system comprises a carriage with a second adapter plate for releasably securing the drive unit, and wherein the drive unit is provided with a second counter plate corresponding to the second adapter plate. In both cases, the mechanical interface or separation point to the system of Limited adapter plate and back plate, so that a simple assembly and easy disassembly under the operating conditions of a roll mill are possible.

In an advantageous aspect, the roller-turning system has a lock case for the feed control of the guide carriage. The lock case is part of the carriage, while the second adapter plate is arranged on the lock case. This leaves the lock case including its elaborate feed mechanism on the base system, so that the assembly or disassembly of the drive correspondingly simple.

Fig. 1

in einer perspektivischen Gesamtansicht eine erfindungsgemäß ausgeführte Walzenmühle mit einem Walzendrehsystem, welches zwei Basiseinheiten und nur eine Supporteinheit sowie nur eine Antriebseinheit umfasst,

Fig. 2

in einer vergrößerten Einzeldarstellung die erste Basiseinheit nach Fig. 1 mit Linearführungen,

Fig. 3

in einer perspektivischen Ansicht die mit einer Antriebseinheit und mit einer Supporteinheit zu einer Walzendrehmaschine komplettierte erste Basiseinheit nach Fig. 2,

Fig. 4

in einer vergrößerten Einzeldarstellung die zweite Basiseinheit nach Fig. 1 mit Flach- und Prismenführung als Variante der Ausführung nach Fig. 2,

Fig. 5

in einer perspektivischen Ansicht die mit einer Antriebseinheit und mit einer Supporteinheit zu einer Walzendrehmaschine komplettierte zweite Basiseinheit nach Fig. 4,

Fig. 6

in einer perspektivischen Gesamtansicht die Walzenmühle nach Fig. 1 beim Abdrehen des ersten Walzenmantels und

Fig. 7

die Anordnung nach den Fig. 1, 6 beim Abdrehen des zweiten Walzenmantels.

An embodiment of the invention is described below with reference to the drawing. Show it:

Fig. 1

in a perspective overall view of a roll mill according to the invention with a roll-turning system, which comprises two base units and only one support unit and only one drive unit,

Fig. 2

in an enlarged detail the first base unit after Fig. 1 with linear guides,

Fig. 3

in a perspective view with a drive unit and with a support unit to a roll lathe completed first base unit after Fig. 2 .

Fig. 4

in an enlarged detail the second base unit after Fig. 1 with flat and prismatic guide as a variant of the design according to Fig. 2 .

Fig. 5

in a perspective view with a drive unit and with a support unit to a roll lathe completed second base unit after Fig. 4 .

Fig. 6

in a perspective overall view of the roller mill after Fig. 1 when turning off the first roll shell and

Fig. 7

the arrangement after the Fig. 1 . 6 when turning off the second roll shell.

Fig. 1 shows in a perspective overall view of an inventively designed roller mill with a machine frame also referred to as a roller mill, on which two counter-drivable rollers 2, 3 are mounted rotatably parallel to the axis. The roller mill is used for grinding coarse ceramic materials, in particular alumina for the production of bricks or the like. The rollers 2, 3 are almost completely enclosed by a housing 27. At the top of the housing 27 is an opening through which the two rollers 2, 3 are visible, and through which the ceramic mass to be processed is filled during operation and then ground between the two rollers 2, 3.

The second roller 3 is fixedly mounted on the machine frame 1, which is why it is also referred to as a hard roller. The first roller 2 is designed as a so-called Loswalze. This means that it can be moved relative to the machine frame 1 by means of an adjusting mechanism 26 and is adjustable in its distance from the second roller 3. Between two rollers 2, 3 there is a gap, not shown, through which the ceramic material is moved. In the gap, the grinding of larger particles takes place to a dimension which is less than or equal to the gap width. About the adjustment of the roll distance by means of the adjusting mechanism 26, the gap width and thus the freeness are set.

The peripheral surfaces of both rollers 2, 3 are cylindrical in the desired state. In conjunction with the axis-parallel mounting of both rollers 2, 3, it follows that said gap between the two rollers 2, 3 running parallel to the axial direction has a constant width, resulting in a correspondingly uniform grinding result along the entire gap. However, the grinding process also causes wear of only initially cylindrical surfaces of both rollers 2, 3. The wear is noticeable in the form of notches, grooves, grooves or the like, resulting in a deviation from the desired cylinder shape and thus to a deviation from the above mentioned constant gap width leads. In order to restore the desired cylindrical surfaces on demand, the roll mill comprises a roll turning system with which the peripheral surfaces of the rolls 2, 3 are machined or over turned from time to time. Among other things, to take account of this fact, both rollers 2, 3 are constructed in several parts in the embodiment shown, and both each comprise a not shown, radially inner hub unit. At these hub units each one in the Fig. 6, 7 recognizable, radially outer roll shell 28, 29 interchangeably fixed, the roller shells 28, 29 are covered in the usual grinding operation shown here by removable covers 24, 25. In any case, effective for the grinding peripheral surfaces of the rollers 2, 3 are formed in the present embodiment by the peripheral surfaces of the respective roller shells 28, 29. Consequently, it is here also the peripheral surfaces of the roll shells 28, 29, which are over-turned if necessary. The over-rotation can be done several times, each time although the desired cylindrical shape is restored, but also each time accompanied by a reduction in the wall thickness of the respective roll shell 28, 29 must be accepted. Once the wall thickness has fallen below a certain nominal size, the affected roll shell 28, 29 can be disassembled from said hub unit and replaced with a fresh copy. In the context of the invention, however, rolls 2, 3 without exchangeable roll mantle 28, 29 can also be used or considered.

The roller rotation system according to the invention has exactly two base units 4, 5, each with a guide system 6. The first base unit 4 is fixedly mounted on the machine frame 1 in the peripheral area of the first roller 2, while the second base unit 5 is fixedly mounted on the machine frame 1 in the peripheral area of the second roller 3. The roll-turning system further comprises exactly one support unit 7 and exactly one drive unit 8, which are designed in a modular manner for mutual mounting on one of the two base units 4, 5 and also for disassembly thereof. The support unit 7 comprises a support 21 for a turning tool 22 with a corresponding feed device. The drive unit here comprises an electric motor 30, a gear 31 and an electrical connection unit 32. In the usual or ordinary grinding operation, the support unit 7 and the drive unit 8 are dismantled and set aside so that only the two base units 4, 5 remain on the machine frame 1. The support unit 7 and the drive unit 8 are shown here as two separate units. But they can also be designed as an integrated unit and then assembled or disassembled together.

Fig. 2 shows in an enlarged detail representation, the first base unit 4 after Fig. 1 , Accordingly, here is the guide system 6 of linear guides with linear rails 9 and 10 linear carriage formed. The two linear rails 9 are detachably screwed onto a console 14 and can be replaced if necessary. The associated linear carriages 10 are part of a guide carriage 15, which also has a first adapter plate 16 and a lock case 20 with a second adapter plate 18. The linear carriage 10 are screwed under the first adapter plate 16 and also interchangeable. The guide carriage 15 is part of the stationary base unit 4. The console 14 still carries a rack 23, in which a not-shown gear of the lock box 20 engages, if necessary, a feed of the carriage 15 in the direction of the guide system 6, that is axially parallel to the rollers 2, 3 to effect. Instead of the rack 23 may also be provided a tension spindle or the like.

Fig. 4 shows in an enlarged detail representation of the second base unit 5 after Fig. 1 , Accordingly, here the guide system 6 deviating from the first base unit 4 of flat and prismatic guides with a flat rail 11, with a prism rail 12 and with sliding guides 13 is formed. The flat rail 11 and the prism rail 12 are as well as the linear rails 9 detachably screwed onto a console 14 and can be replaced if necessary. The associated sliding guides 13 are designed as in their geometry to the flat rail 11 and the prism rail 12 adapted sliding shoes, which analogous to the linear carriage to Fig. 2 screwed under the first adapter plate 16 and also are interchangeable. In the remaining features and reference numerals, the second base unit 5 agrees Fig. 4 with the first base unit 4 after Fig. 2 match.

The Fig. 3 . 5 still show the base units 4, 5 after the Fig. 2 . 4 which alternately, ie not simultaneously by means of the support unit 7 and the drive unit 8 after Fig. 1 are each completed to a roll lathe. Under pairwise reference to the Fig. 2, 3rd as well as the Fig. 4, 5 It is clear that the support unit 7 rests with its first counter-plate 17 on the first adapter plate 16 of the guide carriage 15 and is aligned with respect to this not shown positioning elements such as dowel pins or the like. An attachment can be done by means of screws or quick fasteners. A combined positioning and mounting can be achieved by means of so-called zero-point clamping systems. The same applies mutatis mutandis to the alignment and attachment of the drive unit 8 on the guide carriage 15, wherein the drive unit 8 rests with a second counter-plate 19 on the second adapter plate 18 and this is aligned opposite. In such a completed state, the drive unit 8 can be switched over the lock case 20 on the rack 23 to a driven feed of the support unit 7 with the turning tool 22 in the direction of the longitudinal axis of the guide system 6 according to an arrow 33 and thus axially parallel to the rollers 2, 3rd ( Fig. 1 . 6, 7 ).

In the exemplary embodiment shown, two different base units 4, 5, namely once with linear guides and once with flat and prismatic guides, are shown. This is one of several possibilities and serves here in particular the representation of different options. In practice and within the scope of the invention, it will be expedient, depending on the prevailing requirements in both cases, a same configuration, so choose either with linear guides or with flat and prismatic guides. In addition, a guide carriage 15 is provided as part of the respective stationary mounted guide system 6 in the embodiments shown. The linear carriage 10 and the sliding guides 13 are here mounted on their respective guide carriage 15 and thus also part of the stationary built guide system 6. In the invention, it may also be appropriate, the linear carriage 10 and the sliding guides 13 directly to the support unit. 7 to attach, so they are also part of the modular assembly or disassembly components. Another possibility is in the context of the invention in a waiver of the console 14, in which case the linear rails 9 and the flat rails 11 and the prism rails 12 are mounted directly on the machine frame 11.

Based on the previously written, the operation in practical operation is now clear. According to Fig. 1 the usual grinding operation is carried out with disassembled support unit 7 and disassembled drive unit 8. The grinding operation generates considerable vibrations, which also affect the roll turning system in the form of inertial forces. The remaining fixed to the machine frame 1 parts of the two guide systems 6 are here acted upon by the lack of the support unit 7 and the drive unit 8 only of relatively low inertial forces, and can therefore do without additional anti-vibration measures, vibration or the like.

If now the two rollers 2, 3, more precisely their two roller shells 28, 29 have to be turned off due to wear on the peripheral side, first the first base unit 4 according to Fig. 3 completed with the support unit 7 and the drive unit 8 to a roll lathe, as in the overview Fig. 6 is shown. In the Fig. 1 shown cover 24 is removed, so that the peripheral surface of the roll shell 28 of the first roller 2 is accessible to the spanned on the support unit 7 lathe tool 22. The first roller 2 is now driven in rotation, while the support unit 7 is moved axially parallel along the peripheral surface by means of the drive unit 8. The turning tool 22 is delivered to the roller surface so far that in this case a chip is lifted from the peripheral surface of the first roller 2. As a result, the desired cylinder shape is restored.

Subsequently, the support unit 7 and the drive unit 8 are converted from the first base unit 4 to the second base unit 5, so that there corresponding to a complete roll turning machine Fig. 5 is formed. Fig. 7 shows in a perspective view of this state, so that analogous to the first roller 2 according to Fig. 6 Subsequently, now the second roller 3 is turned off.

After both rollers are turned off and thereby provided with a cylindrical shape, the support unit 7 and the drive unit 8 are disassembled. In addition, the peripheral openings in the housing 27 are closed again by means of the covers 24, 25. By means of the adjusting mechanism 26 is still the desired distance between the two rollers 2, 3 and thus set the width of the intermediate gap. This is the state after Fig. 1 restored, and the usual grinding operation can be resumed.

Claims (8)

Roller mill for grinding coarse ceramic materials, comprising a machine frame (1), two rollers (2, 3) rotatably mounted on the machine frame (1), and a roller turning system for turning off the surface of the rollers (2, 3), the roller turning system comprising at least one base unit (4 5) with a guide system (6), a support unit (7) movable on the guide system (6) and a drive unit (8),
characterized in that the roll-turning system has exactly two base units (4, 5), each with a guide system (6), wherein each one base unit (4, 5) in the region of a respective roller (2, 3) is fixedly mounted on the machine frame (1) , and wherein the roll turning system further comprises only one support unit (7) and only one drive unit (8), which are designed in a modular manner for mutual mounting on one of the two base units (4, 5) and also for disassembly thereof. Roll mill according to claim 1,
characterized in that the guide system (6) of linear guides with linear rails (9) and linear carriage (10) is formed, wherein the linear rails (9) are releasably secured. Roll mill according to claim 1,
characterized in that the guide system (6) of flat and prismatic guides with a flat rail (11), with a prism rail (12) and with sliding guides (13) is formed, wherein the flat rail (11) and / or the prism rail (12) is releasably attached. Roll mill according to one of claims 1 to 3,
characterized in that the base unit (4, 5) comprises a bracket (14) for receiving the guide system (6) and for releasable attachment to the machine frame (1). Roll mill according to one of claims 1 to 4,
characterized in that the guide system (6) has a guide carriage (15) with a first adapter plate (16) for releasable attachment of the support unit (7), and that the support unit (7) with a first adapter plate (16) corresponding first counter-plate (16) 17) is provided. Roll mill according to one of claims 1 to 5,
characterized in that the guide system (6) has a guide carriage (15) with a second adapter plate (18) for releasable attachment of the drive unit (8), and that the drive unit (8) with a second adapter plate (18) corresponding second counter-plate (18) 19) is provided. Roll mill according to claim 6,
characterized in that the roller turning system comprises a lock box (20) for feed control of the carriage (15) and that the lock box (20) is part of the carriage (15), the second adapter plate (18) being disposed on the lock case (20) , A roll turning system for use in a roll mill according to any one of claims 1 to 7, wherein the roll turning system comprises at least a base unit (4, 5) having a guide system (6), a support unit (7) movable on the guide system (6), and a drive unit (8). having,
characterized in that the roll-turning system has exactly two base units (4, 5), each with a guide system (6), wherein each one base unit (4, 5) for fixed mounting in the region of one roller (2, 3) on the machine frame (1) and wherein the roll turning system further comprises only one support unit (7) and only one drive unit (8), which are designed in a modular manner for mutual mounting on one of the two base units (4, 5) and also for disassembly thereof.

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