EP3969182A1 - Vorrichtung und verfahren zum schwingungstechnisch optimierten koppeln einer mahlkammer an exzenterwellen einer schwingscheibenmühle sowie verwendung - Google Patents
Vorrichtung und verfahren zum schwingungstechnisch optimierten koppeln einer mahlkammer an exzenterwellen einer schwingscheibenmühle sowie verwendungInfo
- Publication number
- EP3969182A1 EP3969182A1 EP20726794.9A EP20726794A EP3969182A1 EP 3969182 A1 EP3969182 A1 EP 3969182A1 EP 20726794 A EP20726794 A EP 20726794A EP 3969182 A1 EP3969182 A1 EP 3969182A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- eccentric
- grinding chamber
- balancing mass
- phase offset
- elastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/14—Mills in which the charge to be ground is turned over by movements of the container other than by rotating, e.g. by swinging, vibrating, tilting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/24—Driving mechanisms
Definitions
- the invention relates to a device and a method for the vibration-optimized coupling of a grinding chamber to eccentric shafts of a vibrating disk mill.
- the invention also relates to the use of eccentric shafts with a predefined phase offset in a predefinable phase offset range.
- the invention relates to a device and a method or a use according to the preamble of the respective independent or subsidiary claim.
- Vibrating disc mills are used to crush solids as finely as possible, for example to provide the crushed or ground solids for material analysis (e.g. XRF, AAS, NIR, ICP-MS).
- material analysis e.g. XRF, AAS, NIR, ICP-MS.
- Vibrating disc mills usually have a grinder which is arranged in a housing between a material feed (inlet) and a material discharge (outlet).
- the grinder comprises, for example, a pot with a lid and grinding body (hereinafter “grinding stone"), the grinding stones e.g. can be designed as stones, discs, lenses or a ring.
- Vibratory disc mills can grind the solids based on pressure, impact and / or friction.
- the grinding stone is set in motion by a drive with eccentric shafts.
- the object of the invention is to provide a device and a method with the features described above, with which the operation of a vibrating disc mill with an eccentric shaft drive can be optimized in terms of vibration, in particular with regard to vibration optimization of the entire device, even with greatly varying loads .
- the task can also be seen as optimizing the components of the mill related to the vibration excitation or their operating behavior.
- a vibrating disc mill device set up for comminuting feedstock, in particular feedstock with a particle size of less than 20mm or less than 10mm, in particular designed for grinding the feedstock to particle sizes of less than 75pm, with: a mill housing; a grinding system arranged in the mill housing such that it can oscillate, with a grinding chamber and with at least one grinding stone arranged movably in the grinding chamber; and with at least one eccentric shaft drive mounted in the mill housing and generating the oscillating movement in the grinding chamber and at least two eccentric shafts, in particular at least two synchronously rotating eccentric shafts; and with at least one balancing mass unit coupled to the eccentric shaft drive, set up to compensate for unbalance; the balancing mass unit being coupled to the eccentric shaft drive in such a way that a phase offset greater than 180 °, in particular greater than 185 °, can be set between one / the eccentric maximum of the balancing mass unit and one / the eccentric maximum of the grinding chamber.
- the offset is not exactly 180 °.
- the vibrational interplay of grinding stone and chamber, chamber and balancing masses, and / or input material (varying mass) and generally the vibrating device components of the mill can be optimized.
- the balancing mass unit can be coupled to the eccentric shaft drive in such a way that the desired phase offset can be set as a function of the activation of the eccentric shaft drive.
- the countermass system can lag behind the rotary movement of the grinding system, for example by at least 5 °.
- This offset can be specified and regulated according to the invention.
- an optimization of vibration technology can be ensured, in particular in the sense of a buffer function.
- the angular offset according to the invention greater than 180 ° can ensure a certain buffer function to avoid disadvantageous oscillation states in the event of a lagging imbalance of the balancing mass unit. Not least, this also enables a particularly wide range of applications for the respective mill.
- the invention is based on the concept of setting the offset between the eccentric maximum of the balancing masses and the eccentric maximum of the grinding chamber not equal to 180 °, with a preferably lagging grinding stone being / is vibrated in such a way that, in particular, even with varying loads and / or varying relative positions of the vibrating components, in particular of the millstone, a smooth running that is as constant as possible or a vibration-related excitation that is as constant as possible is ensured, in particular under varying loads or speeds.
- the invention also enables changes in the operating state to be compensated for between idling and full load in a particularly simple and effective manner. This allows a single type of mill to be used in a flexible manner. The practicality is improved.
- eccentric maximum Only a single eccentric maximum is preferably provided per revolution, which is predetermined by the offset of individual diameters on the eccentric shafts.
- several eccentric maxima could be realized, for example, by means of a cam control, but the present invention is primarily based on the comparatively easy to implement concept of a vibration optimization with a predefined relative arrangement of the eccentric maximum, i.e. without cam control. Nevertheless, the technical measures can be expanded to include such a cam control in individual cases, if desired.
- the balancing mass unit comprises, for example, two balancing mass elements, in particular in the form of two rings, in an arrangement above and below the grinding chamber. It has been shown that the use of at least two balancing mass elements is more advantageous than just one balancing mass element, in particular with regard to different heights or to additional (to be avoided) tilting moments.
- the respective balancing mass element does not necessarily have to be connected to all eccentric shafts; rather, at least one individual balancing mass element can also be arranged on each shaft.
- a balancing mass element coupled to all shafts provides the advantage that the space between the shafts can also be used for a counter mass.
- At least one dependency or at least one ratio from the following group must be predefined:
- the setting of the phase offset can in particular also be achieved by mechanical coupling, e.g. by means of feather keys, in particular on the respective eccentric shaft.
- a coupling of the balancing mass unit to the eccentric shaft drive can also be understood as a coupling of the balancing mass unit to at least one eccentric shaft.
- all eccentric shafts have exactly the same phase offset.
- the phase offset can be set in such a way that the maximum eccentric of the balancing mass unit lags or is chronologically behind the maximum eccentric of the grinding chamber. By such a negative If the balancing mass unit is offset by more than half a revolution, varying operating conditions can be compensated particularly effectively.
- the balancing mass unit is activated / controllable as a function of the activation of the eccentric shaft drive in such a way that a phase offset in the range from 185 ° to 200 ° can be set. It has been shown that this offset is particularly advantageous, in particular also with regard to counter-rotating unbalance compensation.
- An offset, in particular a lag, by an angle of rotation of 185 ° to 200 ° can in particular provide the advantage that the expected relative shifts of relative positions or centers of gravity are compensated with good probability or with particularly good effectiveness. It has been shown that a distance of 5 ° to 20 ° of half a revolution can ensure compensation, in particular with a good safety factor, without having to deviate too much from the concept of counter-oscillating masses. In other words: In this area of deviation from exactly the opposite vibration, a more tolerant, broadly compensating vibration behavior can be ensured for a more variable operating range of the mill.
- the control takes place in such a way that the regulated relative angle of rotation or phase offset of the compensating mass unit compensates for different relative positions of the at least one millstone relative to the maximum eccentric in part load and full load operation, in particular for the purpose of compensating for changes in the operating state between idle and full load.
- the range of applications can also be broadened, in particular with regard to the type and quantity of the input material.
- the angle of rotation or phase offset of the compensating mass unit is adjustable, in particular by providing at least one eccentric disk on at least one eccentric shaft, in particular an eccentric disk that can be positioned in the relative rotational position to the eccentric shaft.
- a large variability can also be provided by means of comparatively simple structural measures.
- the same types of measures are preferably taken on all eccentric shafts; in particular, at least one eccentric disk is provided on each eccentric shaft.
- the adjustability of the balancing mass unit can be ensured, for example, by mechanical connections by means of which a predefined offset can be set.
- a passport means such as e.g. a feather key, which is useful in the present context.
- the adjustability can also be ensured by a toothed shaft, a cone clamp and / or a locking bolt.
- Rotation of the eccentric disks relative to the shaft can also take place during operation, in particular in the sense of a fine adjustment.
- the angle of rotation or phase offset of the balancing mass unit can be regulated as a function of vibrations of the vibrating disk mill device, in particular by detecting accelerations in at least one spatial direction. This allows e.g. actively respond to current operating situations.
- the vibrations can be detected by means of a plurality of multi-axis acceleration sensors.
- at least one threshold value is defined, in particular with respect to at least one of a plurality of horizontal spatial axes, above which threshold value a phase offset control takes place.
- cam control can be implemented.
- a multiple ring eccentric bearing in particular a Five-ring eccentric bearings can be implemented. The latter can simplify readjustment during operation.
- an acceleration sensor on the base plate can record the vibration speeds, in particular in the horizontal direction.
- at least one multi-axis acceleration sensor is provided, in particular set up for integrated measurement / detection of horizontal vibration speeds.
- the at least one grinding stone has a diameter of at least 50% of the inner diameter of the grinding chamber, in particular in the range from 60% to 85%.
- a start-up process can also be optimized (safe machine start-up).
- a relatively large millstone relative to the dimensions of the chamber also provides the advantage that a phase control can be set in a particularly effective manner. Such effects are particularly noticeable at a ratio greater than 60%. It has been shown that a ratio greater than 85% can have a disadvantageous effect, in particular with regard to the usable free volume.
- the size dimensions of the grinding chamber can in particular be described by those surfaces or walls on which the grinding stone rolls.
- the grinding stone rolls off the inside of the grinding chamber. With a diameter of the grinding stone of at least 50% of the inner diameter of the grinding chamber, the mill can run particularly smoothly and safely.
- the grinding stone can be excited into a desired rolling movement in a comparatively short start-up phase and kept in a smooth, stable run. ok
- the maximum eccentric of the grinding chamber is at least 2% of the inner diameter of the grinding chamber, in particular in the range from 4% to 8%.
- a start-up process can also be optimized (safe machine start-up).
- a relatively strong eccentric shaft (comparatively large eccentricity) relative to the dimensions of the chamber also provides the advantage of a clear, unambiguous phase regardless of the current configuration or loading of the chamber. With a ratio greater than 4%, the advantages are even more noticeable. It has been shown that a ratio greater than 8% can have a disadvantageous effect, in particular with regard to reaction forces or inertia or variability of the operating conditions.
- eccentric disks for the grinding chamber have an eccentricity (or an eccentric maximum) of at least 2% of the inner diameter of the grinding chamber.
- eccentric maximum can thus be understood synonymously with the geometric eccentricity of a geometric measure on the shafts.
- the grinding chamber and the balancing masses have, in particular, eccentrically offset attachment points on the eccentric shafts.
- the eccentrics can have a different phase offset and a different eccentricity on the shafts.
- the eccentric maximum of the balancing mass unit is greater than the eccentric maximum of the grinding chamber, in particular by a factor of at least 1, 2 to 3. Due to the comparatively large eccentricity of the balancing mass unit, the balancing masses (their Mass), which can also have an advantageous effect on the design requirements, e.g. with regard to the dimensioning of the bearings.
- the ratios of the maxima can in particular be described on the basis of relative geometric dimensions of eccentric elements (e.g. discs).
- the at least one grinding stone has a diameter which is predefined by the inner diameter of the grinding chamber minus a factor of 5 to 7 of the maximum eccentric of the grinding chamber.
- the size of the eccentric (or the extent of the eccentricity) when the grinding chamber is excited can define the impact or impulse exerted on the grinding stone. Because a large grinding stone has to travel a comparatively short distance to the opposite wall of the grinding chamber, based on the conditions described here, a positive effect for a safe start-up of the mill can also be ensured. However, a comparatively maximally large millstone has only a little free volume (little freedom of movement) available, so that a rolling movement is restricted. It has been shown that in this area of tension, the range from 5 to 7 for the factor described above ensures a good compromise for reliable start-up and optimal grinding operation can. In other words: With this special variant of the size ratios, an advantageous setting can be ensured both for start-up and for continuous operation.
- the eccentric maximum can be predetermined in a geometrical manner, for example, by the diameter of an eccentric element (in particular a disk).
- a vibratory disk mill device set up for comminuting feed material, in particular feed material with a particle size of less than 20 mm or less than 10 mm, in particular set up for grinding the feed material to particle sizes less than 75 ⁇ m, with: a mill housing; a grinding system arranged in the mill housing such that it can oscillate, with a grinding chamber and with at least one grinding stone arranged movably in the grinding chamber; and with at least one eccentric shaft drive mounted in the mill housing and generating the oscillating movement in the grinding chamber and at least two eccentric shafts, in particular at least two synchronously rotating eccentric shafts; and with at least one balancing mass unit coupled to the eccentric shaft drive, set up to compensate for unbalance;
- the balancing mass unit is coupled to the eccentric shaft drive in such a way that a phase offset greater than 180 °, in particular greater than 185 °, can be set between one / the eccentric maximum of the balancing mass unit and one / the eccentric maximum of the grinding
- the aforementioned object is also achieved according to the invention by a method for the vibration control of a vibratory disk mill device when comminuting feedstock, in particular feedstock with a particle size of less than 20mm or less than 10mm, in particular in the case of a previously described one Vibratory disk mill device, the vibratory movement of the vibratory disk mill device being generated by means of an eccentric shaft drive comprising at least two eccentric shafts in a vibratory grinding system with a grinding chamber and with at least one vibratory millstone arranged in the grinding chamber, with unbalance compensation being carried out by means of at least one balancing mass unit coupled to the eccentric shaft drive ;
- the vibrational regulation of the vibratory movement takes place by regulating a phase offset between one / the eccentric maximum of the balancing mass unit and one / the eccentric maximum of the grinding chamber, the phase offset being set to an amount greater than 180 °, in particular greater than 185 °.
- the phase offset is set in such a way that the eccentric maximum of the balancing mass unit lags or is chronologically behind the eccentric maximum of the grinding chamber.
- This operating mode has proven to be particularly advantageous, particularly with regard to the greatly varying load on the mill (e.g. wide range of type and amount of feed material).
- the balancing mass unit can be coupled to the eccentric shaft drive in such a way that a phase offset in the range of 185 ° to 200 ° is set, i.e. in a range of at least 5 ° to a maximum of 20 ° deviation from exactly opposite excitation. In this way, a particularly variable operating behavior can be achieved (here figuratively referred to as vibration-related system elasticity).
- a phase offset regulation can take place in particular as a function of the activation of the eccentric shaft drive and / or of the relative arrangement of eccentrics.
- the main mass of the oscillating system is provided by the grinding vessel with its holder.
- the millstone can assume a rotation angle offset of a maximum of approx. 90 °.
- the angle of rotation or phase offset of the balancing mass unit is predefined or actively regulated in such a way that different relative positions of the at least one millstone in partial load and full load operation are compensated relative to the maximum eccentric, in particular relative to the maximum eccentric of the grinding chamber, in particular to compensate for changes in the operating state between idle and Full load.
- smooth running can also be ensured largely independently of the operating state specified by the drive.
- the balancing mass unit is set in the angle of rotation or phase offset, in particular by positioning or actively positioning at least one eccentric disk on at least one eccentric shaft in the rotational position relative to the eccentric shaft (adjustment of the relative position for vibration optimization).
- the operating behavior can also be predefined in a robust manner by means of simple measures.
- the angle of rotation or phase offset of the balancing mass unit is regulated as a function of vibrations of the vibrating disk mill device, in particular by recording acceleration parameters in at least one spatial direction and evaluating them for the vibration regulation. This also enables active counter-regulation in response to current operating situations.
- a control / regulating device set up to carry out a method described above, the imbalance compensation being carried out by means of at least one compensating mass unit coupled to the eccentric shaft drive, in which a phase offset between the eccentric maxima of the compensating mass unit and the grinding chamber is not equal to 180 ° is set or actively regulated with a phase difference of at least 5 ° or at least 10 ° in relation to a 180 ° phase offset, the control / regulating device in particular at least one Measuring unit is coupled or comprises this.
- the aforementioned object is also achieved according to the invention by using eccentric shafts with a phase offset in a vibrating disk mill device, in particular in a vibrating disk mill device described above, for setting an operating state that is optimized in terms of vibration, the eccentric shafts on the one hand exciting a grinding chamber with at least one millstone movably arranged in the grinding chamber, and The eccentric shafts on the other hand excite at least one balancing mass unit, the eccentric shafts being coupled to the grinding chamber and to the at least one balancing mass unit in such a way that a phase offset between the eccentric maxima of the at least one balancing mass unit and the grinding chamber is unequal to 180 regardless of the operating state or the current loading of the grinding chamber ° is ensured, in particular in a range of 5 to 15 ° offset with respect to 180 ° phase offset.
- a further vibration-related optimization can take place on the structural level by means of at least one material-elastic articulation unit.
- the grinding chamber can be coupled to the eccentric shafts by means of at least one material-elastic articulation unit.
- This also enables a movement-tolerant or position-tolerant connection of the grinding chamber to the eccentric shafts, whereby the operating behavior of the mill can be further optimized, in particular also with greatly varying loading, i.e. with varying movement behavior of the grinding stone.
- the material-elastic link units can compensate for oscillation effects or compensate for vibrations; on the other hand, stresses caused by temperature fluctuations or positional tolerances can also be minimized.
- a particularly far-reaching vibration-optimized mill can be implemented when the measures relating to phase offset are combined with measures based on a material-elastic link unit.
- the optimization of the mill based on measures for material-elastic mounting of the chamber can be implemented in a particularly expedient manner by means of the measures described here with regard to phase offset, for example by setting a corresponding operating behavior in terms of control technology in mills with material-elastic articulation unit.
- the grinding chamber can be coupled to the eccentric shafts by means of at least one material-elastic link unit. This enables a movement-tolerant or position-tolerant connection of the grinding chamber to the eccentric shafts, whereby the operating behavior of the mill can be optimized.
- the mounting of the eccentric shafts can be optimized in a particularly effective manner in that the bearings of the eccentric shafts are elastically coupled to the chamber. It has been shown that by means of one or more linkage units, on the one hand, the centrifugal forces, which are dependent on the speed, can be transferred directly to the eccentric shafts, but on the other hand, the forces and torques caused by thermal expansion and tolerances can also be compensated.
- the use of one or more material-elastic link units also has the advantage that active control of any stiffness or elasticity parameters is not required. A correspondingly desired damping can already be ensured by means of the material-elastic link unit (s) alone. In particular, it is also possible to benefit from the material-elastic properties of the linkage unit in connection with the setting of a phase offset.
- the material-elastic articulation unit has, for example, a sheet metal plate or is formed thereby, in particular by at least one metallic plate. This also provides the advantage that no costly post-processing operations are necessary for material-elastic sections of the link unit.
- Steel has the advantage that large forces can be transmitted permanently even at elevated temperatures.
- the grinding vessel or grinding chamber can be shrunk into it by means of a steel linkage unit.
- steel can also perform a heat conduction function, in particular to lower the temperature in the grinding vessel.
- material-elastic is to be understood as a functionality integrated into the material to compensate for tensions or positional tolerances, in particular a functionality without joints without relative movement of parts relative to one another.
- a relatively lower rigidity of a first material section in relation to a relatively higher rigidity of a second material section or material region can be defined as “materially elastic”.
- the “material-elastic” functionality in particular also requires a relative movement, so that a “material-elastic” section also has a movement tolerance.
- rigidity or the “material-elastic” functionality can be adjusted in particular with regard to the following parameters or sizes of the overall system: geometry (in particular diameter); Weights (grinding jar, millstone and grist); Eccentric measure (grinding vessel, grinding stone and grist); Speeds; Temperatures; to be observed Tolerances.
- geometry in particular diameter
- Weights grinding jar, millstone and grist
- Eccentric measure grinding vessel, grinding stone and grist
- Speeds Temperatures; to be observed Tolerances.
- the masses and diameters as well as the maximum speed and the temperature difference of the components have a major influence.
- the material-elastic link unit is material-elastic by at least one flexurally elastically mounted section between the grinding chamber and the eccentric shafts, in particular flexurally elastic in the radial direction, in particular with a bending moment or a flexural rigidity which, in particular in the radial direction, is at least one power of ten less than the rigidity the coupled power-carrying components (in particular grinding chamber; bearings; eccentric shafts; base plate).
- a section that is supported in a flexurally elastic manner can in particular be understood as a section that is supported by bending in the elastic region of the material used.
- a flexurally elastic mounting in the sense of the present invention is to be understood in particular as a mounting in which the movement / position tolerance is ensured essentially or even exclusively by bending the coupling element.
- This mounting differs from a spring mounting by means of tension or compression springs and also differs from a mounting by means of spiral springs, in particular when the material-elastic section provides an integral functionality of the linkage unit, ie is not provided as a separate spring.
- the material-elastic section is designed as a single strand of material, which does not run in a spiral like a spring, but which extends between the coupling points or bearing points to be connected to one another, in particular on an at least approximately direct path between two connection points.
- the material-elastic linkage unit can also be material-elastic in the circumferential direction around the grinding chamber by / due to at least one flexurally elastic section between the grinding chamber and the eccentric shafts, in particular with a bending moment or a flexural rigidity which, in particular in the circumferential direction, is at least one power of ten smaller than the Rigidity of the coupled force-carrying components (in particular grinding chamber; bearings; eccentric shafts; base plate).
- a respective material-elastic section of the material-elastic linkage unit can extend without winding between the coupling points or bearing points to be connected to one another. This also provides good multi-directional storage properties.
- the respective material-elastic section can also be described / referred to as a bending rod.
- the material-elastic sections are preferably of different stiffness in at least two directions of movement, primarily soft or material-elastic in the radial direction.
- the material-elastic sections are preferably to be arranged vertically / orthogonally to the radial direction, in particular exactly in the circumferential direction.
- the material-elastic articulation unit comprises or provides a grinding chamber receptacle, in particular in a one-piece, integral design, in particular in a central arrangement integrated into the material-elastic articulation unit.
- the material-elastic link unit comprises at least one material-stiff area, in particular for a grinding chamber receptacle, with at least one material-elastic section coupling the material-elastic area to the respective eccentric shaft in a material-elastic manner and in particular in a radial direction movement-tolerant way. This also provides a robust integral arrangement in each case.
- the material-elastic link unit is designed from a prefabricated semi-finished product, in particular in a completely solid configuration. Last but not least, this also provides robustness and longevity and enables the material-elastic section (s) to be easily adapted to the respective application.
- the material-elastic articulation unit can be coupled to the eccentric shaft together with the balancing mass element (s) in an arrangement above or below a balancing mass element of the balancing mass unit or in an arrangement between at least two balancing mass elements.
- the link unit can also be integrated in an expedient manner into an advantageous structural design, in particular in the form of a one-piece disk.
- the balancing mass elements can also be stored via the eccentric shafts and move out of phase with the grinding unit.
- the balancing mass elements are optimally arranged on the level of the grinding vessel (grinding chamber), in particular in order to also be able to compensate for tilting moments.
- at least two levels are provided, each with at least one balancing mass element, which are arranged above and below the grinding vessel.
- the material-elastic linkage unit couples the grinding chamber in at least one coupling point per eccentric shaft with movement tolerance to the respective eccentric shaft, in particular by means of a bearing receptacle for the arrangement of a bearing for the respective eccentric shaft, the at least one coupling point offset in the circumferential direction with respect to an articulation point or force introduction point is arranged on the grinding chamber, in particular with an offset in the range of a circumferential angle of 30 ° to 120 °, in particular in an at least approximately tangential extent.
- This also makes it possible to provide advantageous technical bending properties.
- the material-elastic link unit couples the grinding chamber in at least one coupling point per eccentric shaft by means of a material-elastic section in the form of a material-elastic arm movement-tolerant to the respective eccentric shaft, the material-elastic arm being a one-piece, integral component of the material-elastic link unit, in particular in the form of a preferably massive bending beam-like one Material section.
- the bending beam-like material section preferably has no cavities or cavities.
- An exemplary stiffness value is e.g. in the range of approx. 0.1 mm to 0.3 mm per 1000N radial force on the eccentric shafts. This stiffness value can be defined, for example, as “flexible” or “material-elastic”, in particular with regard to the other force-carrying components.
- the material-elastic link unit or at least a respective material-elastic section of the material-elastic link unit is designed to be solid, in particular with an exclusively convex cross-sectional profile contour. This can also minimize the risk of material failure.
- the massive design also provides the advantage that, even with a comparatively stiff material, great flexural softness can be set or achieved in the material-elastic section.
- the respective material-elastic section preferably does not have any cavities or cavities.
- the respective material-elastic section preferably has an exclusively convex cross-sectional profile contour.
- the cross-sectional profile can taper outward towards the free end.
- the material-elastic link unit has at least three material-elastic arms (three-armed configuration), which each extend in the circumferential direction around a / the grinding chamber receptacle of the material-elastic link unit, in particular in a symmetrical arrangement around the grinding chamber receptacle, and which are each at its free End having a bearing receptacle, and which each have a free length from the center of the bearing receptacle to a pivot point (or pivot section or center of a Articulation section) on the grinding chamber receptacle corresponding to a circumferential angle of at least 30 ° to 45 °, in particular corresponding to a circumferential angle of at least 45 ° to 60 °, in particular a free length in the range of at least 50% to 90% of the diameter of the grinding chamber receptacle , in particular at least 75% to 90% of the diameter of the grinding chamber receptacle.
- the material-elastic link unit can e.g. have at least three material-elastic sections which together span a circumferential angle of at least 120 °, 150 ° or 180 ° around the grinding chamber. This favors a storage with regard to bending movements. This also enables great variability in terms of optimizing the linkage unit for a particular application, e.g. regarding the choice of material.
- the material-elastic link unit couples the grinding chamber in at least one coupling point per eccentric shaft by means of a material-elastic arm to the respective eccentric shaft, the respective material-elastic arm having a length in the range of 50 from a transition to the grinding chamber receptacle to the free end of the arm Has% to 150% of the diameter of the grinding chamber holder, in particular 80% to 120% of the diameter of the grinding chamber holder. This also enables a good length for material-elastic movement tolerance, in particular for bending movements.
- the radial distance of a respective bearing receptacle of the material-elastic link unit is smaller than the diameter of the grinding chamber receptacle of the material-elastic link unit, in particular smaller than half the diameter or smaller than the radius of the grinding chamber holder.
- the material-elastic function in particular a flexural elasticity, can also be realized with comparatively stiff, robust materials.
- the position and size of the compensation hole can be adapted to the respective material or application.
- the compensation hole also enables fine adjustment of the mass distribution.
- an inner radius is formed on / at a transition between the grinding chamber receptacle and the respective material-elastic arm, in particular an inner radius in the range from 10% to 25% of the cross-sectional width of the arm.
- a / the transition between the grinding chamber receptacle and the respective material-elastic arm is rounded in both circumferential directions or has a rounding. In this way, a robust arrangement with a further optimized stress and force curve can be provided in each case.
- the material-elastic linkage unit has a grinding chamber receptacle for the grinding chamber, which grinding chamber receptacle completely surrounds the grinding chamber in the circumferential direction, the grinding chamber receptacle preferably being designed as a circular cross-section or as a cylindrical receptacle in the manner of a socket .
- the material-elastic link unit is designed as a comparatively flat disc, in particular with a uniform thickness (extension in the axial longitudinal direction), in particular with a uniform thickness of both the arms and the grinding chamber receptacle of the material-elastic link unit.
- This also provides variability in terms of material selection.
- the structural design can also be further optimized.
- the thickness of the link unit is comparable to the thickness of balancing mass units or retaining clips.
- the link unit can also be well integrated in a constructive and functional manner.
- the material-elastic mounting can also be adjusted with regard to a desired two-dimensionality.
- a bending movement in particular can be forced or aligned bidirectionally in a predefinable plane.
- the bending moment can be greater about a first axis than about a second axis, in particular by a significant factor which is selected to be so large that the relative movement is forced into the desired plane.
- the material-elastic link unit is set up to couple the grinding chamber elastically to the eccentric shafts with movement tolerances of less than 1 mm, preferably less than 0.5 or 0.3 or 0.2 mm, in particular with these movement tolerances in the radial direction , especially flexible. Effective force transmission can also be ensured in this way.
- the vibratory disk mill device preferably has the eccentric shaft drive as the single drive for all eccentric shafts, the eccentric shaft drive being arranged eccentrically with respect to the grinding chamber.
- This drive concept has proven to be particularly advantageous in connection with the linkage unit.
- the grinding chamber holder can e.g. can be separated from a plate forming the linkage unit, in particular by plasma cutting. Any reworking can be limited in particular to reworking holes and transition radii.
- FIG. 2A, 2B, 2C, 2D each show an eccentric shaft for use in a vibrating disk mill device according to an exemplary embodiment in different views;
- Vibrating disk mill device according to an embodiment
- FIG. 4 shows a vibrating disk mill device in a perspective view
- FIG. 5 shows a view of an underside of a grinding system of a
- 6A, 6B, 6C each show a material elastic in a perspective view
- 1A, 1B, 1C illustrate different operating states, in each case as a function of a phase offset w, a resulting force vector of a resulting imbalance being set individually in each case.
- FIG. 1A A vibration state that requires optimization is illustrated in FIG. 1A.
- the angle of rotation or phase offset w13 of the millstone is dependent on the grinding conditions, in particular on the load.
- An operating state with a comparatively large residual imbalance is shown.
- a force vector F1 of the imbalance force of the grinding chamber points in a different direction than a force vector F2 of the imbalance force of the grinding stone.
- a force vector F3 of the imbalance force of the balancing mass unit points opposite to F1 (phase offset exactly 180 °).
- the angle of rotation or phase offset w13 of the millstone is plotted between F1 and F2.
- FIG. 1B a vibration state that has been optimized in terms of vibration by phase offset optimization is illustrated.
- F3 points at an angle not equal to 180 ° opposite to F1 (phase offset, for example approx. 195 ° or 200 °; FIG. 1B is not exactly to scale).
- the angle of rotation or phase offset w16 of the balancing mass unit is plotted here between F1 and F3 for the sake of simplicity.
- a residual imbalance becomes zero or can be leveled according to the invention, in particular by setting the phase offset w16 accordingly.
- phase offset w16 of the balancing mass unit is selected according to the invention in such a way (here for the purpose of illustration corresponding to that phase offset in FIG. 1B) that the resulting residual imbalance oscillates around the value zero.
- a mean value can be determined, for example, as an empirical value from the normal operation of the mill over a predefined operating period, in particular for the purpose of specifying a single predefined advantageous phase offset w16 for the balancing mass unit. This can also save time-consuming readjustment.
- the comparatively small / short force vector Fn is aligned in a first or in a second opposite direction and ideally oscillates around a mean value zero with only a small deflection.
- FIG. 7A it can be seen that individual cams each comprise a disk 15.1 which can be arranged with a predefinable offset or angle of rotation relative to the further cams or disks.
- the individual cams or discs can be e.g. position relative to one another by means of connecting means 15.2 (for example screw connections or fitting means).
- Figure 2 shows a shaft with three cams.
- one of the cams interacts with the grinding chamber, and the other two cams are each coupled to one of two balancing mass units. It has been shown that a particularly advantageous operating behavior can be achieved if the middle cam couples the grinding chamber.
- FIG. 2B The relative position of the individual cams or disks is further illustrated in FIG. 2B.
- serial assembly of individual machine elements can be provided, in particular in such a way that the disks can optionally be retrofitted.
- FIGS. 2C and 2D Phase offsets set to different sizes are illustrated in FIGS. 2C and 2D.
- 2C illustrates an offset of 180 ° (identified as disadvantageous according to the invention).
- FIG. 2D illustrates an example of an offset of ⁇ 20 ° (identified as advantageous according to the invention) with respect to the exactly opposite, opposite arrangement according to FIG. 2C (180 °), that is to say 200 °.
- Such an offset can That is, relatively between the cam for the chamber and the respective cam for the balancing mass unit (s) can be implemented, either permanently predefined or also adjustable during operation or during breaks in operation or when the mill is reconfigured (optional readjustment).
- FIG 3 shows a vibrating disk mill device 10 with a control / regulating device 20 and with at least one measuring unit 21, in particular comprising at least one acceleration sensor.
- the vibrating disk mill device 10 shown in FIG. 4 comprises a mill housing 11 in which a grinding system 13 is arranged, to which feed material can be fed via a material feeder 12. The feed material is ground and can then be removed at a material discharge 19.
- the grinding system 13 arranged in between comprises a grinding chamber 13.1 with at least one grinding stone (not shown).
- An eccentric shaft drive 14 is coupled to a plurality of eccentric shafts 15 and drives at least one of the eccentric shafts 15.
- a balancing mass unit 16 with a plurality of balancing mass elements 16.1 is used for mass balancing.
- a material-elastic linkage unit 17 is arranged in particular in an arrangement between at least two balancing mass elements 16. 1 and is material-elastically coupled to the eccentric shafts 15.
- the linkage unit 17 couples / couples the grinding chamber 13.1 material-elastic, in particular flexurally elastic, to the shafts 15.
- the linkage unit 17 has a grinding chamber receptacle 17.1, in particular in an at least approximately centric arrangement.
- the material-elastic coupling can be ensured to a large extent or also essentially via a plurality of material-elastic sections 17.3, here in each case in particular in the form of a free arm which also extends in the circumferential direction.
- the respective material-elastic section 17.3 has in particular: a transition 17.2 between the grinding chamber receptacle 17.1 and the free section of the arm, a compensation hole 17.4 (in particular to compensate for masses or stresses during relative movements), an inner radius 17.5 and a Rounding 17.6, in particular optimized with regard to minimizing stress peaks at the transition 17.2, at least one bearing receptacle 17.7 with a ring section 17.71 in an arrangement at the free end of the respective arm, a coupling point 17.8 to the shaft 15, and an articulation point or articulation area (or Geometric center) of a linkage section 17.9 at the respective transition 17.2.
- a bearing 18 for the corresponding eccentric shaft 15 can be enclosed in the respective bearing seat 17.7, e.g. by form and / or force fit.
- the area that defines the grinding chamber receptacle 17.1, in particular an annular area 17.1 1 around it, can be made material-rigid, for example also by material post-treatment or material differentiation.
- D17.1 diameter of the grinding chamber holder D17.1 diameter of the grinding chamber holder; d17 free length of the material-elastic section 17.3, in particular in the circumferential direction u; r radial direction; r1 free radial spacing of the bearing seat, in particular with respect to the grinding chamber seat; z vertical direction or longitudinal direction (axial direction); z17 thickness of the link unit; a circumferential angle or offset in the circumferential direction between articulation point 17.9 and bearing seat 17.7.
- FIG. 4 shows a vibrating disk mill device 10 with a grinding system 13 driven by eccentric shafts.
- FIG. 5 shows a grinding system 13, mounted on a base plate, with three eccentric shafts 15, one of which is driven by a drive 14.
- 6A, 6B, 6C show the arrangement of a material-elastic articulation unit 17 integrated between two balancing mass units 16, 16.1. Both the
- Linkage unit 17 and also balancing mass units 16 are coupled to eccentric shafts 15.
- the three coupling material-elastic sections 17.3 each extend in the circumferential direction u over an angle a in the range from 60 to 100 °, in particular approximately 85 °.
- the inner diameter D13.1 of the grinding chamber is also indicated in FIG. 6A, in particular defined by the inner walls of the grinding chamber on which the grinding stone rolls.
- FIG. 7A, 7B show the individual sections of an integral, solid, one-piece material-elastic link unit 17 with arms 17.3 that are flexurally elastic in the radial direction.
- a grinding chamber receptacle 17.1 is centrally defined by a comparatively rigid area 17.1 1.
- the transitions between this materially rigid area 17.1 1 (or the articulation section 17.9) and the respective arms 17.3 are all rounded (in particular areas 17.2, 17.5, 17.6). Further measures optimizing mass distribution or stress distribution or force flow can e.g. be ensured by the compensation hole 17.4 shown in the respective arm.
- the respective bearing seat 17.7 is provided by an integral one-piece solid ring section 17.71, the center of which defines the coupling point 17.8 (center point of the eccentric shaft).
- acceleration sensor F1 Force vector imbalance force grinding chamber (or grinding system without grinding stone and without balancing mass unit)
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019207222.4A DE102019207222A1 (de) | 2019-05-17 | 2019-05-17 | Vorrichtung und Verfahren zum schwingungstechnisch optimierten Koppeln einer Mahlkammer an Exzenterwellen einer Schwingscheibenmühle sowie Verwendung |
| PCT/EP2020/063714 WO2020234191A1 (de) | 2019-05-17 | 2020-05-15 | Vorrichtung und verfahren zum schwingungstechnisch optimierten koppeln einer mahlkammer an exzenterwellen einer schwingscheibenmühle sowie verwendung |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP3969182A1 true EP3969182A1 (de) | 2022-03-23 |
| EP3969182B1 EP3969182B1 (de) | 2023-06-21 |
| EP3969182C0 EP3969182C0 (de) | 2023-06-21 |
Family
ID=70775383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20726794.9A Active EP3969182B1 (de) | 2019-05-17 | 2020-05-15 | Vorrichtung und verfahren zum schwingungstechnisch optimierten koppeln einer mahlkammer an exzenterwellen einer schwingscheibenmühle sowie verwendung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3969182B1 (de) |
| DE (1) | DE102019207222A1 (de) |
| WO (1) | WO2020234191A1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2212601A1 (de) * | 1972-03-16 | 1973-09-20 | Gerhard Dr-Ing Linke | Scheiben- und ringschwingmuehle |
| SU1433499A1 (ru) * | 1986-12-22 | 1988-10-30 | Институт Геотехнической Механики Ан Усср | Вибрационна мельница |
| DE4343742C2 (de) * | 1993-12-21 | 1999-10-14 | Krupp Polysius Ag | Scheibenschwingmühle |
| US10518269B2 (en) * | 2017-10-13 | 2019-12-31 | SPEX SamplePrep, LLC | Grinding mill with securing frame |
-
2019
- 2019-05-17 DE DE102019207222.4A patent/DE102019207222A1/de not_active Ceased
-
2020
- 2020-05-15 WO PCT/EP2020/063714 patent/WO2020234191A1/de not_active Ceased
- 2020-05-15 EP EP20726794.9A patent/EP3969182B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020234191A1 (de) | 2020-11-26 |
| DE102019207222A1 (de) | 2020-11-19 |
| EP3969182B1 (de) | 2023-06-21 |
| EP3969182C0 (de) | 2023-06-21 |
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