WO2023031097A1 - Laborkugelmühle - Google Patents
Laborkugelmühle Download PDFInfo
- Publication number
- WO2023031097A1 WO2023031097A1 PCT/EP2022/073910 EP2022073910W WO2023031097A1 WO 2023031097 A1 WO2023031097 A1 WO 2023031097A1 EP 2022073910 W EP2022073910 W EP 2022073910W WO 2023031097 A1 WO2023031097 A1 WO 2023031097A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- machine part
- ball mill
- drive
- coupling
- clamping
- 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.)
- Ceased
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Classifications
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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
- B02C17/14—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
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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
- B02C17/04—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 with unperforated container
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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
- B02C17/1805—Monitoring devices for tumbling mills
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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
- B02C17/04—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 with unperforated container
- B02C17/08—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 with unperforated container with containers performing a planetary movement
Definitions
- the invention relates to a laboratory ball mill, in particular a vibratory ball mill, centrifugal ball mill or planetary ball mill, more particularly a planetary ball mill with a transmission ratio of 1:-1, with at least one grinding bowl holder for at least one grinding bowl, which is arranged on a machine part of the ball mill that is moved during grinding operation of the ball mill, with a a clamping device arranged on a moving machine part for transmitting a clamping force and/or a clamping torque to the grinding bowl and/or to the grinding bowl holder and having a coupling device with at least one coupling element, with energy being transmitted via the coupling device from the stationary machine part to the moving machine part in order to generate the clamping force is.
- DE 10 2012 009 987 A1 discloses a laboratory ball mill, in particular a planetary or centrifugal ball mill on a laboratory scale, which can be used in particular for larger grinding vessels on a laboratory scale, i.e. typically 160 ml, 250 ml or even 500 ml, and an automatic clamping of a grinding vessel on a grinding vessel holder allows.
- a carrier device rotates about a vertical central axis.
- the known mill has one or more grinding stations about a planetary axis offset parallel to the central axis, which is or are rotatably mounted with respect to the carrier device.
- the grinding station has a receiving device or grinding bowl holder for at least one grinding vessel that can be filled with material to be ground and grinding bodies, in particular grinding balls.
- the receiving device is carried along by the carrier device about the central axis and additionally rotates—usually in the opposite direction—to the carrier device about the eccentrically mounted planetary axis.
- a drive for the carrier device and a further drive for the grinding station are provided.
- a motor drive with an eccentric shaft as a coupling element is provided for automatic axial clamping of the grinding vessel in the receiving device, ie axial clamping that is not brought about by manual application of the clamping force.
- the tensioning takes place by rotating the eccentric shaft, the eccentric shaft acting from below against a grinding bowl base.
- the eccentric shaft is mounted in a transverse bore in a downwardly extending pin of a clamping base.
- the pin engages in a matching coaxial bore in a bearing pin of a lower floor part of the laboratory mill.
- the eccentric shaft transmits a Height change via needle bearings on the clamping floor.
- the clamping floor lifts a pressure plate in the form of a pressure plate via a spring assembly.
- the pressure plate in turn lifts the grinding vessel used against a pressure yoke above the grinding vessel, which acts as a stop for the grinding vessel cover, until all axial gaps are eliminated from the clamping system.
- the eccentric shaft is moved beyond its knee point in order to generate self-locking in the braced state.
- the grinding vessel is tensioned by a motor.
- the known ball mill has a motor which is fixed in place on a stationary device housing outside the carrier device.
- the motor drives a drive shaft which is slotted at its inner end for coupling to a cross pin affixed transversely to the eccentric shaft when the milling station comes to rest in a specified loading and unloading position and proper rotational orientation. If the slot coupling is coupled, the eccentric shaft can be rotated via the motor in order to automatically clamp the grinding vessel axially or automatically release the clamping again.
- the eccentric shaft only in the coupled state is energy transmission provided from the motor drive arranged on the stationary machine part to the tensioning mechanism provided on the moving machine part for generating the tensioning force.
- the automatic clamping of the grinding jar has the advantage that the force generated when the clamping mechanism is relaxed does not have to be applied by the user, but is applied automatically by the clamping motor.
- the automatic clamping of the grinding bowl leads to greater user comfort and enables the same and therefore reproducible clamping force with every clamping process. Furthermore, security against incorrect operation can be increased.
- the automatic clamping of the grinding bowl provided in the known ball mill has a number of disadvantages:
- a coupling of the eccentric shaft to the drive motor requires an exact rotational orientation of the grinding station when the mill is at rest. Due to wear and/or contamination, it can happen that the exact rotational orientation required for a coupling is not achieved, making it difficult to couple the eccentric shaft to the drive shaft of the motor.
- the self-locking of the eccentric shaft generated during the clamping of the grinding jar is intended to ensure that the clamping of the grinding jar Tension during grinding operation does not unintentionally release. Due to wear, however, the position of the knee point can change, so that safety against unintentional loosening of the clamping of the grinding bowl may no longer be guaranteed.
- the arrangement and alignment of the motor and eccentric shaft relative to one another that is specified for the coupling process also means that the mill's design is not very compact.
- the automatic clamping of the grinding bowl in the known mill has been solved in a structurally complex manner.
- the energy or power transmission from the motor via the eccentric shaft and the other components of the clamping device that interact with the eccentric shaft requires a correspondingly massive design of the power transmission elements with high component weight, so that the components that are moved during the grinding operation experience high centrifugal forces in the grinding operation and the bearing and drive load is high.
- the object of the present invention is to provide a laboratory ball mill of the type mentioned at the outset, in particular designed as a laboratory vibratory mill, with the option of automatic clamping of the grinding jars, in which the clamping of the grinding jars is realized in a structurally simple manner with a light and compact design of the laboratory mill.
- the structural design of the automatic clamping of the grinding jar should offer the possibility of clamping different grinding jar geometries, in particular grinding jars with different grinding jar heights.
- a coupling element is also provided in the mill according to the invention, via which drive energy or drive force is transmitted from a stationary machine part of the mill to a machine part that is moved during grinding operation of the mill to generate the automatic grinding bowl clamping required clamping force is transmitted.
- the coupling element also) during the Grinding operation is mechanically coupled or connected to the stationary machine part and to the moving machine part.
- a permanent, continuous, ongoing, uninterrupted, non-destructively separable coupled and/or permanent connection of the coupling element to an energy generating unit, in particular a motor drive, is provided on and/or on the stationary machine part of the ball mill and with the moving machine part of the ball mill.
- an energy generating unit in particular a motor drive
- the configuration according to the invention of the automatic clamping of the grinding bowl can be implemented advantageously in vibratory mills in particular.
- the forwarding and transmission of force and/or energy via the coupling element required to generate a clamping force and/or a clamping moment is independent of the state of motion of the grinding bowl holder, more particularly independent of a specific angular position of a rocker of a vibratory mill connected to the grinding bowl holder or independent of a certain rotational orientation of a carrier device carrying the grinding bowl holder.
- a preferably mechanical coupling via the coupling element can equally be provided during grinding operation and when stationary.
- the coupling during the grinding operation makes it possible, in particular, to forward or transmit a driving force or a driving torque or a driving energy via the coupling element from the stationary machine part of the mill to the moving machine part, even during the grinding operation, in order to generate a clamping force and /or to generate a clamping moment.
- the invention also allows a driving force or a driving torque or a driving energy to be transmitted only when the mill is at a standstill.
- a mechanical device for example a safety clutch, can then be provided in order to maintain a tensioned state of the grinding bowl during the grinding operation, independently of a force and/or energy transmission via the coupling element.
- the clamping device of the mill according to the invention can have a spindle drive, for example, in a manner known per se, with a torque transmitted from the coupling device to the clamping device being converted into a translational adjustment movement of a threaded spindle or push rod.
- the coupling device of the laboratory mill according to the invention is set up and designed for the transmission of energy and/or force or torque from the stationary machine part to the machine part of the mill that moves during grinding operation.
- the coupling device can have other components and devices, for example at least one drive wheel on a drive side of the coupling device assigned to the stationary machine part and/or at least one output wheel on an output side of the coupling device assigned to the moving machine part.
- a torque generated by the driven wheel can then be converted into a transverse movement of a threaded spindle or a connecting rod with a spindle device.
- components of the coupling device for example an adjustable piston element, are adjusted or moved transversely by transmission of drive energy and/or drive force from the coupling element, thereby generating an axial clamping force that can be transmitted directly or indirectly to the grinding bowl .
- relative movements there are relative movements between the moving machine part of the ball mill and the stationary machine part.
- relative movements occur between the rockers on which the grinding bowl holders are provided, relative to the stationary mill structure.
- Relative movements between moving machine parts of the ball mill and fixed machine parts also occur in centrifugal ball mills or planetary ball mills due to their function.
- relative movements can preferably be compensated for only via the coupling element.
- the compensation is particularly preferably carried out without technical joint components as connections between rigid components or sections of the coupling element that can be moved in a predetermined manner.
- the coupling element can be designed to be movable in several dimensions, at least in certain areas.
- the coupling element can have at least two degrees of freedom of movement, each orthogonal to the main direction of movement, based on the direction of movement of the coupling element when transmitting a clamping torque and/or a clamping force, particularly preferably with the coupling element being able to move freely orthogonally to the main direction of movement.
- the configuration according to the invention of the automatic clamping of the grinding bowl can be implemented advantageously, in particular in the case of vibratory mills Vibrations occurring during the grinding operation of the vibratory mill swings, to which the grinding cup holders are attached, can be compensated for relative to a fixed (housing) part of the vibratory mill by the mobility of the coupling element. In this way, the occurrence of relevant component stresses combined with the risk of component failure can be avoided in a structurally simple manner.
- a first and preferred embodiment of the invention relates to the mechanical transmission or forwarding of kinetic energy or kinetic energy from a motor drive arranged on the stationary machine part via the coupling element to the moving machine part.
- the clamping force and/or the clamping moment is generated decentrally with the motor drive, which is stationary when the ball mill is in operation.
- the motor power is available through a suitable structural design of the coupling to the grinding bowl holder.
- a compact and lightweight construction of the components required for the automatic clamping of the grinding bowl is possible. Due to a lower component mass, a higher payload of the movable machine part of the ball mill is possible and/or a lower load on the drive provided for moving the movable machine part during grinding operation.
- a lower component mass means that during the grinding process, the components required for the automatic clamping of the grinding bowl on the moving machine part experience lower centrifugal forces and can be designed more delicately.
- the coupling element can be a traction mechanism of an in particular form-fitting traction mechanism drive for the mechanical transmission of movement or force.
- at least one drive wheel or drive shaft of the motor drive can be installed on the drive side of the coupling device and thus on the stationary machine part, and at least one output wheel or output shaft can be installed on the output side of the coupling device or on the moving machine part be provided.
- a drive torque is transmitted from the motor drive via the drive wheel, in particular a gear or a gear arrangement, and an output torque is transmitted directly or indirectly to the tensioning device via the output gear, in particular a gear or a gear arrangement.
- the output torque can be converted, for example, with a spindle device into a clamping force required for clamping the grinding bowl.
- a chain of a chain drive or a toothed belt can be provided as a coupling element in order to transfer torque through wheels with a corresponding positive-locking profile, in particular gear wheels, from a drive shaft of the motor drive to the traction mechanism or from the traction mechanism to an output shaft on the to transfer moving machine part of the ball mill.
- a traction means of a non-positive traction means drive can also be provided as a coupling element, with a tensioning moment being transmitted via a drive belt by frictional forces acting between the contact surfaces between the belt and pulleys.
- a linear chain transmission with a thrust means as a coupling element can also be provided for the transmission of movement or force.
- the coupling element is designed as a ball or pearl chain with a core and a multiplicity of balls or pearl bodies attached to the core, preferably at the same distance.
- a bead chain drive is preferably provided, the bead chain being connected on the drive side to a drive wheel for torque transmission from a motor shaft of the motorized drive and on the output side to a driven wheel for torque transmission to the tensioning device.
- the drive wheel and driven wheel can have indentations distributed over the circumference and adapted to the balls or bead bodies of the bead chain.
- the output torque can be converted into a transversal clamping force for clamping the grinding bowl with a spindle device.
- the bead chain enables hose bends in all spatial directions, so that the position of the output side of the bead chain drive can be easily adapted to the structural conditions inside the ball mill and a compact mill structure can be implemented.
- the bead chain can be guided in a hose in one or more hoses.
- the hose guide also fulfills a protective function for the pearl necklace.
- the hose can preferably extend between a drive wheel and a driven wheel of the bead chain drive over the entire length of the bead chain, so that the bead chain is surrounded by a hose in every area between the wheels.
- the drive wheel and/or the driven wheel can have a groove-shaped running surface which is delimited by lateral flanks of the wheel and which contains indentations in the running base.
- the string of pearls is guided between the flanks in the area of the wheels.
- a cardan shaft or a shaft that is at least partially flexible can alternatively be provided as a coupling element.
- the coupling device can have a gear arrangement for torque conversion of a transmitted drive torque, in particular on the output side.
- a planetary gear can, for example, generate a higher torque on the output side.
- the gear arrangement can be self-locking so that rotation is only possible in one direction. If the gear arrangement works together with a spindle, a self-locking design of the spindle and the gear is possible, so that a safeguard against unintentional loosening of the clamping of the grinding bowl is guaranteed even if the transmission of force or torque from the coupling element to the driven wheel is interrupted, for example if the bead chain breaks .
- an overload safety device can be provided, which can be designed in particular as a magnetic slipping clutch and/or can be arranged in particular on the output side of the coupling element.
- a sensor device with at least one sensor for detecting a clutch separation in the event of an overload can be provided, in particular for detecting the slipping of a slipping clutch.
- a control and/or regulation device can then be used to control and/or regulate a motor drive as a function of a detected clutch separation.
- two coupling devices each with at least one coupling element, can be provided, with energy being transmitted from the stationary machine part via the coupling devices two separate (kinematically decoupled) moving machine parts are provided, in particular with the coupling device are coupled to a common drive arranged on the stationary machine part for energy transmission from the stationary machine part to the moving machine part or can be coupled via a coupling device.
- the plurality of coupling devices makes it possible, for example, to use a motor drive on the stationary machine part to transmit a clamping torque to two clamping devices of a vibratory mill, which are arranged on different rockers of the vibratory mill.
- Each coupling device can have a drive wheel which is arranged on the fixed machine part and which is coupled to the motor shaft of the motorized drive or which can be coupled via a coupling device.
- Torque can be applied to both drive wheels via the motor shaft, with the torque being transmitted from the respective drive wheel via a coupling element assigned to the drive wheel, for example a pearl chain, to a driven wheel on the moving machine part.
- a coupling element assigned to the drive wheel for example a pearl chain
- several bead chain drives can be implemented in order to transmit a cable force or a tensioning torque from a motor drive on the stationary machine part via two bead chains to driven wheels that are mounted on different moving machine parts and the transmitted torque to a tensioning device assigned to the respective moving machine part Transfer grinding bowl tension to the respective machine part.
- a power or torque transmission takes place via two pearl chain drives from a motor drive to two driven wheels, which are arranged on different rockers of a laboratory vibratory mill.
- a power or torque transmission takes place via two pearl chain drives from a motor drive to two driven wheels, which are arranged on different rockers of a laboratory vibratory mill.
- two coupling devices can be provided, each with at least one coupling element, with energy being transmitted via each coupling device from the stationary machine part, in particular from a common drive arranged on the stationary machine part, more particularly with a time delay, to the same moving machine part, in particular with the first Coupling device energy transmission to a clamping device for automatic grinding cup clamping and via the second coupling device Energy transfer can be provided to a pivot drive for automatic rotation of the grinding bowl.
- a clamping force or a clamping torque can be transmitted from the stationary machine part of the ball mill to a clamping device of a grinding bowl holder in order to bring about the automatic clamping of the grinding bowl.
- a drive force and/or a drive torque can then be transmitted to a rotary device for rotating the grinding bowl, the rotary device being set up in particular for rotation after a controlled interruption of the grinding operation and at least partial release of the clamping of the grinding bowl.
- a compressor for providing a compressed fluid, in particular compressed air, or a hydraulic unit for providing a hydraulic fluid can be provided on the moving machine part.
- the coupling device is then connected to the compressor or the hydraulic unit on the drive side.
- a compressed fluid, in particular compressed air can also be taken from a reservoir or line network, for example a pressure vessel that is set up in the vicinity of the laboratory mill and is connected to the laboratory mill via a pressure line.
- a compressed fluid or hydraulic fluid is preferably generated outside the ball mill, which can have appropriate fluid connections to a line network for compressed fluid or hydraulic fluid or a compressor or a hydraulic unit or appropriate pressure tank.
- Compressed air hoses or pressure lines, or even rigid ones can be used as a coupling element for the energy transmission pipes are used.
- elastic deformation of the coupling element can be provided and/or at least one rotary feedthrough can be provided for a sealed transition.
- a pneumatic motor or hydraulic motor can be provided on the output side as part of the coupling device in order to convert hydraulic or pneumatic energy into mechanical work.
- Pneumatic or hydraulic energy can be converted into rotational energy by the effect of pressure on rotors or gear wheels, so that the clamping forces and/or clamping moments required for clamping the grinding bowl can be generated on the output side.
- the coupling device can include a force or energy converter in the manner of a rotary vane or vane pump, with a rotary motion being generated by applying compressed gas or compressed air to a rotor or gear wheel.
- a piston can be provided as the adjustment element, which is adjusted in a translatory manner by the application of compressed gas or compressed air.
- a rotor, a gear or a gear arrangement or the adjusting piston can then interact with a tensioning device on the moving machine part or also be part of the tensioning device in order to generate the tensioning forces and/or tensioning torques required for the automatic clamping of the grinding bowl.
- an actuator can be carried on the grinding bowl holder, which converts an electrical signal into mechanical movements to generate a drive torque and/or a drive force, for example as an electromechanical drive drives a threaded spindle and/or moves a push rod of a clamping device and thus generates an axial clamping force.
- the actuator can be supplied with electrical power from the laboratory mill's operating power supply.
- the transmission of hydraulic, pneumatic or electrical energy from the stationary machine part via the coupling element to a moving machine part, in particular a grinding bowl holder, can be carried out as an alternative or in addition to the mechanical transmission of kinetic energy via a coupling element to be provided.
- the energy transmitted with a corresponding coupling element can be provided in forces and/or torques for the clamping of the grinding bowl and/or for the rotation of the grinding bowl when the grinding bowl is held in and/or on the grinding bowl holder and the clamping of the grinding bowl is released.
- FIG. 1 shows a schematic partial view, partially in section, of a first embodiment of a vibratory mill according to the invention with a coupling device for transferring energy from a stationary machine part to a moving machine part, with a pearl chain drive for generating a clamping force for automatic clamping of the grinding bowl,
- FIG. 2 shows a schematic partial view of the output side of a coupling device for transferring energy from a stationary machine part to a moving machine part with a bead chain drive, with a driven wheel for a bead chain of the bead chain drive being provided on the output side of the coupling device,
- FIG 3 shows a schematic partial view of the drive side of a coupling device for transferring energy from a stationary machine part to a moving machine part with a bead chain drive, a drive wheel for a bead chain of the bead chain drive being provided on the drive side of the coupling device,
- FIG. 4 shows a schematic partial view of the output side of a coupling device for energy transmission from a stationary machine part to a moving machine part with a bead chain drive, a planetary gear with a ring gear being provided on the output side of the coupling device as an output gear for a bead chain of the bead chain drive,
- FIG. 5 shows a perspective partial view of the vibratory mill from FIG. 1 .
- FIG. 6 shows a partially exploded view of the vibratory mill from FIG. 1
- 7 shows a schematic partial view, partially in section, of an alternative embodiment of a vibratory mill according to the invention with two coupling devices for force and/or torque transmission to two clamping devices arranged on different vibratory arms of the vibratory mill
- Fig. 8 shows a schematic partial view, partially in section, of a further alternative embodiment of a vibratory mill according to the invention with two coupling devices for force and/or torque transmission to a clamping device for clamping the grinding bowl and to a rotary drive for rotating a grinding bowl, the clamping device and the rotary drive being connected to one same grinding bowl holder are realized,
- FIG. 9 shows a perspective partial view of the vibratory mill shown in FIG. 8,
- FIG. 10 shows the vibratory mill shown in FIG. 9 after a grinding bowl has been inserted into a grinding bowl holder on a rocker of the vibratory mill, with the clamping device and the rotary drive being shown partially cut away,
- FIG. 11 shows a schematic partial view of the design of a coupling device on the output side with a slipping clutch to limit the possible torque transmission
- FIG. 12 shows a perspective partial view of the output side of the coupling device from FIG. 11 and
- Fig. 13 Substitute image of the output side with a schematic representation of the gear shift diagram.
- the vibratory mill 1 shows a schematic, partial view of a vibratory mill 1 with a stationary machine part 2 and with a machine part 3 that moves during the grinding operation of the vibratory mill.
- the moving machine part 3 is a rocker arm of the vibratory mill 1 on which a grinding bowl holder 4 for at least one grinding bowl 5 is arranged.
- the vibratory mill 1 preferably has two rockers, with a grinding cup holder 4 being arranged on each rocker.
- the fixed machine part 2 can be a Act base plate, a housing or a machine base frame of the vibratory mill 1, which is stationary during the grinding operation and is fixed relative to the moving machine part 3 during grinding operation.
- the grinding bowl holder 4 has a base plate 7 with two holding legs 8 , 9 .
- a clamping device 6 for clamping the grinding bowl is also implemented on the grinding bowl holder 4 .
- the grinding bowl can be clamped, for example, with a clamping device that is generically described in DE 200 15 868 U1.
- the pressure piece 10 is arranged in a rotationally fixed manner and connected to a threaded bolt 11 shown schematically.
- the threaded bolt 11 is guided in a threaded nut 31 (FIG. 6) with an internal thread.
- the threaded nut 31 has a coupling section 33 (FIG. 6) with square geometry on the end facing away from the grinding bowl 5 and is rotatably mounted in a collar bushing 34 (FIG. 6). Via the coupling section 33, the threaded nut 31 can be connected in a rotationally fixed manner to a carrier wheel 20 (FIG. 6) of a planetary gear provided on the output side.
- the transmission of a torque to the threaded nut 31 leads to an axial adjustment of the threaded bolt 11 relative to the threaded nut 31 and thus to the transmission of a clamping force to the grinding bowl 5 via the pressure piece 10.
- an anti-rotation element 38 can be provided to prevent the pressure piece 10 from rotating.
- a coupling device 12 with a coupling element 13 is provided for the mechanical transmission of force and/or torque from a motor drive 14 arranged on the stationary machine part 2 to the moving machine part 3 or the rocker of the vibratory mill 1.
- a pearl chain or ball chain is provided as the coupling element 13, which has a plurality of pearls 15 or balls arranged at equal distances on a core.
- the coupling device 12 has a drive wheel 16 on the drive side or motor side and a driven wheel 17 on the driven side or on the side of the grinding bowl holder 4 .
- the output wheel 16 is connected to a motor shaft 24 (Fig. 6).
- the drive wheel 16 is kinematically coupled to the driven wheel 17 via the pearl chain.
- a torque transmitted via the bead chain to the output wheel 17 is converted via the spindle drive described above into an axial adjustment movement of the pressure piece 10 to generate the clamping force required for clamping the grinding bowl.
- the wheels 16, 17 each have a groove-shaped running surface delimited by lateral flanks, which in the running ground contains indentations adapted to the pearls 15 of the string of pearls.
- the structural design of the coupling device 12 as a bead chain drive allows for a compact design of the vibratory mill 1 and a flexible arrangement of the drive 14 relative to the vibratory mill 1 rocker.
- the clamping torque or the clamping force is generated in a decentralized manner, with the motor power being available at the grinding bowl holder 4 .
- the multi-dimensional mobility of the bead chain allows the drive 14 to be arranged in a location-adapted manner to the structural conditions inside the vibratory mill 1 relative to the rocker.
- the space available inside the vibratory mill 1 can be optimally used for the automatic clamping of the grinding bowl.
- the string of pearls as the coupling element 13 can be guided in a tube 18, with the cable force being supported on the tube.
- the pearl chain allows hose bends in all directions. Relative movements between the fixed machine part 2 and the moving machine part 3 or the rocker of the vibratory mill 1 can thus be compensated for.
- the hose 18 can be made of PTFE or another lubricious plastic.
- the tube 18 is preferably slotted, so that it is possible to thread the pearl necklace from the side.
- the hose 18 can be encased on the outside with a further hose, which is designed in particular as a C-hose.
- the further tube protects the inner tube 18 from kinking and buckling. In particular, this prevents the inner hose 18 from collapsing when the cable forces are high and, in the event of such a collapse of the inner hose 18, the bead chain being torn out of the inner hose 18 and the drive getting stuck.
- FIG. 6 shows the structure of the coupling device 12 on the output side.
- a gear arrangement for torque conversion from the drive 14 transmitted torque may be provided on the output side.
- the gear arrangement can be designed as a single-stage planetary gear with, for example, four planet gears 21 arranged on a carrier gear 20 and a fixed sun gear 22, with the sun gear 22 interacting with the carrier gear 20 and the driven gear 17 in order to achieve a higher output torque to create.
- the output gear 17 is designed as a ring gear of the planetary gear.
- An output housing 19 is provided to accommodate the output gear 17 .
- the sun wheel 22 is non-rotatably connected to a housing cover 23 of the output housing 19, preferably in a form-fitting manner.
- the sun gear 22 has a plurality of bores 36 (FIG. 4).
- the bores enable a positive fit: the housing has pins that are inserted into the bores of the sun wheel 22.
- the transmission ratio of the planetary gear in a single-stage design can be between 1 and 2.5, for example 2.0.
- a multi-stage design of the planetary gear is also possible, with each stage preferably having a transmission ratio of between 1 and 2.5.
- the transmission of the pearl chain drive can be self-locking, whereby the gear can only be driven from one direction.
- Self-locking of the above-described spindle drive for converting a torque into an axial clamping force on the one hand and self-locking of the gearing on the other hand are preferably provided, so that even in the event of a mechanical interruption of the coupling element 13, for example when the bead chain breaks, there is no risk of the grinding bowl clamping becoming unintentionally released .
- a direct drive for the power transmission via the bead chain or the torque generation is provided on the output side of the coupling device 12 and no gear arrangement, with the cable power of the bead chain being transmitted to a driven wheel 17 designed as a solid wheel . This results in a lower output torque with less complexity of the structure.
- FIG. 3 and 6 show the drive side of the coupling device 12, an electric drive 14 being provided on the drive side.
- the drive shaft 24 is connected to the drive wheel 16 through a recess in a base plate 25 .
- a housing cover 26 forms the end at the top.
- Torque is transmitted from the drive shaft 24 to the drive wheel 24 .
- the torque is transmitted to the output wheel 17 provided on the moving machine part 3 via the pearl chain as a coupling element 13.
- the transmission ratio between the driven wheel 17 and the drive wheel 16 can be between 1 and 2.5, for example 2.0.
- Fig. 5 shows the rocker axis Y3.
- Fig. 5 shows the vibratory mill 1 in a detailed view in the assembled state.
- the torque axes Y1, Y2 on the output side and on the drive side of the coupling device 12 can be arranged at any angle a to one another due to the flexibility of the pearl chain drive with the circulating pearl chain endlessly guided in the hoses 18.
- FIG. 7 shows an alternative embodiment of a vibratory mill 1 according to the invention in a schematic partial illustration, with two coupling devices 12 of substantially identical construction of the one shown in FIGS. 1 to 6 can be provided in order to realize a force and/or torque transmission, preferably from a common motor drive 14, via a motor shaft 24 to the coupling devices 12 and from these to two clamping devices 6 on different rockers of the vibratory mill 1.
- a switching element 27, for example a coupling device, can be provided in order to connect either one coupling device 12 or the other coupling device 12 to the motor shaft 24 and, if necessary, to connect the clamping devices 6 on the two rockers independently from each other and, for example, to clamp or relax at different times.
- FIG. 8 schematically shows an arrangement in which several coupling devices 12 are provided for force or torque transmission from a stationary machine part 2 to a moving machine part 3 , in particular to a rocker arm of the vibratory laboratory mill 1 .
- two coupling devices 12 of identical construction can be provided for force and/or torque transmission.
- Each coupling device 12 is connected via a coupling element 13 to a motor drive 14 which is associated with the respective coupling element 13 and is arranged on the stationary machine part 2 .
- a first coupling device 12 is provided to transmit a force or a drive torque to a clamping device 6 in order to automatically clamp a grinding bowl 5 in a grinding bowl holder 4 .
- a swivel or rotary drive 28 is provided on the side of the grinding bowl holder 4, with which it is possible to move the grinding bowl 5 in the at least partially relaxed state for standardizing the grinding results by transmitting force and/or torque from the further drive shown on the left in Fig. 8 14 and the further coupling device 12, also shown on the left in FIG. 8, to rotate or pivot.
- the rotating device 28 can have a rotary piece 37 which can be connected to the grinding bowl 5 in a positive and/or non-positive manner in order to rotate the grinding bowl 5 as required.
- the rotary piece 37 can have a coupling geometry or key surface on the end side facing grinding bowl 5, which positively engages and/or couples with a complementary coupling geometry or a key surface extension on the adjacent end face of grinding bowl 5 when grinding bowl 5 is inserted into grinding bowl holder 4 is used.
- the grinding bowl 5 can be pivoted by rotating the rotary piece 37 by preferably 180° via the complementary surfaces and surface attachments.
- Control and/or regulation can be provided in such a way that a strained grinding bowl 5 is automatically at least partially relieved, for example after half the grinding time of a grinding process, and then rotated automatically. The rotated grinding bowl 5 is then automatically braced again and the grinding process is continued.
- the automatic grinding bowl clamping and grinding bowl rotation effected via two coupling devices 12 by force and/or torque transmission from the fixed machine part 2 is shown schematically in Fig. 8 by the force arrow 29 and the torque arrow 30, with the arrow 29 indicating the direction of the clamping force when clamping the grinding bowl 5 in the grinding bowl holder 4 and the arrow 30 indicates a possible direction of rotation of the grinding bowl 5 to equalize the grinding results.
- the two coupling devices 12 as described in Fig. 7 via a coupling device or a switching element 27 can be coupled with the same motor drive 14.
- the figs. 9 and 10 shows the vibratory mill 1 from FIG. 8 in a schematic view, with FIG. 9 showing the vibratory mill 1 before inserting a grinding bowl 5 into the grinding bowl holder 4 and FIG.
- the right coupling device 12 can be provided, for example, for power transmission from a first motor drive 14 to a tensioning device 6 and the left coupling device 12 for power transmission from a second motor drive 14 to a rotary drive 28 .
- the coupling devices 12 can have the same structural design. However, there may be structural differences with regard to the torque transmission from the respective bead chain drive to the tensioning device 6 on the one hand and the rotary drive 28 on the other.
- a direct drive is provided for the transmission of cable power and torque generation on the rotary drive 28 side, with the cable power being transmitted to a driven wheel 17 designed as a solid wheel.
- Torque conversion via a gear is preferably not provided on the rotary drive 28 side.
- the transmission of the rope force and the generation of torque on the side of the tensioning device 6 preferably takes place via a gear arrangement with a planetary gear of the type shown in FIG.
- the drive 14 and the coupling device 12 are able to build up large torques and the resulting (clamping) forces.
- An overload can be reliably prevented with the aid of a safety clutch, in particular designed as a magnetic slip clutch.
- a safety clutch in particular designed as a magnetic slip clutch.
- This relates in particular to the case that grinding bowls 5 of different lengths have to be braced in the grinding bowl holder 4 as required.
- Driving and driven wheels 16, 17 and the bead chain as coupling element 13 can be protected from excessive stress by a slipping clutch.
- the gear arrangement on the output side of the coupling device 12 can also be multi-stage, in particular as a multi-stage planetary gear.
- the transmission ratio of the planetary gear can be between 1 and 2.5, for example 2.0.
- the transmission ratio per stage can be between 1 and 2.5, for example 2.0. This allows a higher output torque to be transmitted.
- the first gear stage is preferably formed by a driven wheel 17, which is driven by the pearl chain as a coupling element 13 and is designed as a ring gear.
- the first driven wheel 17 drives a carrier wheel 20 or a planetary carrier.
- a sun gear 22 is firmly connected to a housing cover 23 and is therefore stationary.
- the carrier gear 20 is connected to another sun gear 22 of the second gear stage, which drives another carrier gear 20 of the second gear stage.
- Another ring gear 17a of the second gear stage is fixed.
- the torque transmission from the other web wheel 20 to the threaded nut 31 is also shown schematically. A rotational movement of the threaded nut 31 is converted into a translational movement of the pressure piece 10 .
- the fixed ring gear 17a of the second gear stage is stationary only if the torque of a slip element of the slip clutch is not exceeded.
- ten magnets 32 are used distributed over the circumference in pockets which are provided on the face of the further ring gear 17a.
- An adjacent output housing 19 (see FIG. 12) is also equipped with magnets, for example four magnets, to generate a holding torque so that the other ring gear 17a is held and fixed on the output housing 19 until an overload occurs.
- the further ring gear 17a slips by at least one position and the magnetic field on a sensor 35 provided on the output housing 19 briefly breaks off. As soon as a signal break is detected, it is recognized that an overload situation has occurred.
- the sensor 35 can be a Hall sensor.
- a case of overload can be linked to the reaching of an end position of the pressure piece 10 in terms of open-loop and/or closed-loop control.
- a control and/or regulation with a corresponding control and/or regulation device can be provided, which evaluates the sensor signal of the sensor 35 .
- this makes it possible to link a signal break detected by sensor 35 or the slipping of the slipping clutch to reaching a zero position or end position of a clamping means of clamping device 6 and to use this information for control and/or Provide control of the drive 14.
- the drive 14 can move or adjust the clamping means, for example the pressure piece 10 in the present case, in the direction of the grinding jar 5 until a zero position or end position is detected by slipping of the slipping clutch.
- This makes it possible to reference the drive 14 for a grinding bowl 5 with a specific grinding bowl length to the recognized zero position or end position.
- the drive 14 can then automatically move to the respective end position or zero position for all subsequent clamping processes until a new end position or zero position is reached when using grinding jars 5 with a different grinding jar length reached and is detected by the sensor 35 by a renewed signal break.
- This new end position or zero position then forms the reference position for all subsequent clamping processes.
- a control and/or regulation of the drive 14 is accordingly possible via the detection of an overload when opening the clamping of the grinding bowl if a clamping device, for example the pressure piece 10 in the present case, is opened as far as possible when the clamping of the grinding bowl is released and strikes a component. The impact can then lead to the slipping clutch slipping and can be detected as an overload situation.
- a separating disc for example in the form of a slidable annular separating film, which prevents the magnets 32 from becoming detached from receiving pockets in the driven wheel 17 and then striking the sensor 35 in a form-fitting manner.
- the magnets 32 are held in the receiving pockets by the separating disk and do not have to be glued in the pockets.
- the cutting disc should be as thin as possible and resistant to abrasion. This results in the greatest possible magnetic force and a high torque of the slipping clutch.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/686,601 US20250025885A1 (en) | 2021-08-30 | 2022-08-29 | Laboratory ball mill |
| CN202290000589.3U CN222305967U (zh) | 2021-08-30 | 2022-08-29 | 实验室用球磨机 |
| EP22769927.9A EP4192621A1 (de) | 2021-08-30 | 2022-08-29 | Laborkugelmühle |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021122355.5 | 2021-08-30 | ||
| DE102021122355 | 2021-08-30 | ||
| DE102021126268 | 2021-10-11 | ||
| DE102021126268.2 | 2021-10-11 | ||
| DE102021128267.5 | 2021-10-29 | ||
| DE102021128267.5A DE102021128267B3 (de) | 2021-08-30 | 2021-10-29 | Laborkugelmühle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023031097A1 true WO2023031097A1 (de) | 2023-03-09 |
Family
ID=83322491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2022/073910 Ceased WO2023031097A1 (de) | 2021-08-30 | 2022-08-29 | Laborkugelmühle |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20250025885A1 (de) |
| EP (1) | EP4192621A1 (de) |
| CN (1) | CN222305967U (de) |
| WO (1) | WO2023031097A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD1107247S1 (en) * | 2023-09-11 | 2025-12-23 | Retsch Gmbh | Laboratory mill |
| USD1106746S1 (en) | 2023-09-11 | 2025-12-23 | Retsch Gmbh | Homogenizer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20015868U1 (de) | 2000-09-13 | 2000-12-14 | F. Kurt Retsch GmbH & Co KG, 42781 Haan | Schwingmühle mit Mahlbechereinspannung |
| DE102012009987A1 (de) | 2012-05-22 | 2013-11-28 | Fritsch Gmbh | Laborkugelmühle |
-
2022
- 2022-08-29 WO PCT/EP2022/073910 patent/WO2023031097A1/de not_active Ceased
- 2022-08-29 EP EP22769927.9A patent/EP4192621A1/de active Pending
- 2022-08-29 US US18/686,601 patent/US20250025885A1/en active Pending
- 2022-08-29 CN CN202290000589.3U patent/CN222305967U/zh active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20015868U1 (de) | 2000-09-13 | 2000-12-14 | F. Kurt Retsch GmbH & Co KG, 42781 Haan | Schwingmühle mit Mahlbechereinspannung |
| DE102012009987A1 (de) | 2012-05-22 | 2013-11-28 | Fritsch Gmbh | Laborkugelmühle |
Also Published As
| Publication number | Publication date |
|---|---|
| US20250025885A1 (en) | 2025-01-23 |
| CN222305967U (zh) | 2025-01-07 |
| EP4192621A1 (de) | 2023-06-14 |
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