EP3140110B1 - Druckrollenstation für rundlaufpressen mit zwei druckrollenaufnehmenden druckrollenachsen - Google Patents

Druckrollenstation für rundlaufpressen mit zwei druckrollenaufnehmenden druckrollenachsen Download PDF

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Publication number
EP3140110B1
EP3140110B1 EP15722984.0A EP15722984A EP3140110B1 EP 3140110 B1 EP3140110 B1 EP 3140110B1 EP 15722984 A EP15722984 A EP 15722984A EP 3140110 B1 EP3140110 B1 EP 3140110B1
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EP
European Patent Office
Prior art keywords
pressure roller
roller station
station
guide profile
receptacle
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EP15722984.0A
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German (de)
English (en)
French (fr)
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EP3140110A1 (de
Inventor
Ingo Klaer
Wolfgang Korsch
Jürgen BÖHNLEIN
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Korsch AG
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Korsch AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds

Definitions

  • the invention relates to a pressure roller station for rotary presses with two pressure roller-receiving pressure roller axes according to claim 1 and the use of the pressure roller station according to claim 11.
  • the frame is formed from an open guide profile and the pressure roller axes are adjustable against each other arranged upper and lower pressure roller receptacles, which are guided by the guide profile, the pressure roller axes being arranged parallel to two side parts of the guide profile.
  • the open guide profile enables easy access to the components in the pressure roller station and thus facilitates maintenance, service and replacement of components.
  • Such rotary presses consist of a frame, a rotor with drive, a frame housing, supporting corner connectors, a top plate and a drive base, in which the pressure rollers are received by an upper and a lower receiving device, the upper receiving device on the top plate of the rotary press and the lower Receiving device are attached to the drive base of the rotary press.
  • the two pressure rollers endeavor to move away from each other due to the pressing force that occurs in the pressing process. They are prevented from this by the two holding devices on the head piece and the base of the rotary press, and the two to four corner connectors that connect the head piece and the base to one another.
  • the forces occurring in the pressing process are directly introduced into the head piece and the base via the punches and the holding devices and stimulate these components by means of the pressing forces to vibrate, the frequencies of which are in the audible range and thus lead to considerable noise emissions.
  • pressure roller stations are described in which the frame consists of upper and lower cross members, which are connected by vertical struts. There is also the US 3,891,375 described pressure roller station from two columns arranged between them, on which the pressure roller axes of the pressure rollers are slidably mounted.
  • the frame is pivotally mounted in the press frame about a vertical axis and forms a component of the press housing in the closed position.
  • the frame can be pivoted from its working position by approximately 90 ° into the open position, the drive of the pressure rollers being decoupled and the pressure rollers disengaging from the upper and lower punches.
  • the pressure roller axis for the upper pressure roller is connected to the upper cross member by means of an adjustable spacer.
  • the spacer is used to set the immersion depth of the upper punches in the dies of the die plate.
  • the pressure roller axis for the lower pressure roller is connected via a shaft to a hydraulic setting unit, which acts on the lower pressure roller for the purpose of adjusting the tablet thickness and thus the pressing force.
  • the disadvantage is that the pressing force is absorbed by the entire press frame, which means that the design of the US 3,891,375 disclosed pressure roller station is associated with a high, cost-intensive material expenditure, since the frame of the rotary press and the corner connector must be designed so massive that they can safely absorb the pressing forces that occur. Furthermore, vibrations are caused by the force profile through the frame, which can lead to noise.
  • the mounting of the pressure roller axes for the pressure rollers on the two vertical columns and the frame that can be pivoted in the press frame is soft and flexible, so that the in the US 3,891,375 described pressure roller station can only be used for small press forces.
  • WO 99/33624 discloses a press with which reproducible pressing and ejecting processes can be simulated, the pressing dies being moved by means of exchangeable pressure rollers.
  • the pressure rollers are, however, in the WO 99/33624 disclosed press not arranged in front of a common pressure roller station.
  • GB 842 189 A discloses a rotary press in which there are two pressure rollers which enable the movement of the stamp.
  • the two pressure rollers are attached as part of the GB 842 189 A separated from each other in a lower base area or in an upper roof area of the tablet press.
  • EP 1 354 694 discloses a method and an apparatus for monitoring a brake on a spindle, the spindle being driven by a motor, for example an electric motor.
  • WO 2010/127861 discloses a rotary press with at least one pressure roller unit which is attached to a bearing device by means of a holding device in a detachable manner.
  • the invention is therefore based on the object of providing a pressure roller station which does not have the shortcomings and disadvantages of the prior art and, moreover, ensures improved accessibility to components of the pressure roller station which require maintenance or replacement.
  • the object is solved by the features of main claims 1 and 11. Further embodiments of the invention are described in the subclaims.
  • the object is achieved with a pressure roller station for rotary presses with two pressure roller-receiving pressure roller axes, wherein a guide profile of the pressure roller station is open and the pressure roller axes are arranged on mutually adjustable upper and lower pressure roller receptacles which are guided by the guide profile, the pressure roller axes parallel to two side parts of the Guide profile arranged.
  • This advantageously creates a pressure roller station that can be used to absorb large press forces, the open guide profile of which can be designed to be extremely stable, wherein a press force curve over the machine frame is avoided.
  • the upper and lower pressure roller receptacles can advantageously not only be adjusted independently of one another, but also with one another.
  • the parallel adjustment of the two pressure roller receptacles at a fixed distance from one another enables a surprisingly simple adjustment of the press zone, i.e. the area inside the die hole in which the powdered press material is pressed can advantageously be varied by driving through all areas of the inside of the die sleeve and equally stressing it and be worn out. It was completely surprising that the lifespan of a die can be extended disproportionately and to an unexpected extent.
  • the upper and / or lower pressure roller is adjusted by means of an eccentric shaft.
  • the two pressure rollers are only linearly exactly one above the other in a defined position of the two eccentric shafts.
  • the upper and lower punch heads usually pass the top and bottom dead centers of the pressure roller pair at the same time, so that the same pressing pressure is exerted on the pressing material, which is located in the die hole, from above and below by the pressing tools with a constant pressure holding time becomes.
  • the position of the upper pressure roller is adjusted downwards by turning the eccentric shaft to the right or left, the top dead center of the upper pressure roller moves to the right or left of the central axis compared to the old position of the lower pressure roller, which causes the Press force on the press material in the die hole is shortened and thus reduced, since the plateaus of the upper and lower stamp heads do not simultaneously pass the pair of rollers, which has a negative effect on the hardness of the tablet to be produced.
  • the upper and lower pressure roller bearings and guides are preferably guided axially in parallel. It is therefore ensured that the vertices of the upper and lower pressure rollers are generally on the same axial line for all conceivable adjustments of the pressure rollers and thus the constant pressure holding time is always exerted on the press material, thereby achieving an optimal tableting result.
  • open guide profile denotes the inner structure of the pressure roller station.
  • a profile is open if it has at least one side of the profile that has not completely closed side surfaces, that is to say open structures or openings.
  • a cuboid or a cylinder are, for example, closed profiles.
  • the open guide profile of the present invention is in particular not cylindrical and has no round base.
  • the pressure roller axes are arranged in parallel, which means that the pressure roller axes are arranged essentially parallel to two side parts of the guide profile.
  • the average person skilled in the art knows that the phrase “essentially parallel” means the manufacturing-related tolerances previously discussed. It has been shown that with such a configuration of the guide profile with pressure roller axes running parallel or essentially parallel to it, surprisingly large pressing forces can be reliably absorbed, thereby ensuring particularly quiet and surprisingly low-noise operation of the rotary press according to the invention.
  • essentially or “essentially parallel” or “an essentially right angle” in the sense of the invention preferably means that, due to the manufacturing process, for example welding, milling and / or drilling processes, slight deviations from parallelism or a right one Angles can arise, whereby the average specialist in the field of mechanical engineering would still regard the components described in this way as parallel or at right angles. A deviation from parallelism can also occur through the use or operation of the machine.
  • the average specialist in mechanical engineering with experience in the construction of tablet presses knows the magnitude of such deviations due to the usual manufacturing tolerances, so that the expert still perceives the arrangement as parallel.
  • the two side parts are arranged parallel to one another and can be connected to a connecting part, the side parts and the connecting part enclosing right angles.
  • the average person skilled in the art knows that the phrase "parallel” can also mean small deviations from a 90 ° angle and how large these deviations can be.
  • the person skilled in the art understands the term “right angle” in the overall context of this invention preferably as “right angle” or “as essentially right angle”. The statements made in parallel with regard to the phrase "essentially” apply analogously.
  • the guide profile is thus an open guide profile in the sense of the invention. It is preferred in the sense of the invention that the remaining components of the pressure roller station are arranged on the side and connecting parts of the open guide profile. Due to the open structure of the guide profile, the pressure roller station has surprisingly good access to all components of the pressure roller station that require maintenance and replacement, as well as high stability and unexpectedly high bending stiffness.
  • the components of the open guide profile of the pressure roller station can be generated by milling, which leads to a particularly high precision of the components.
  • the two side parts of the open guide profile preferably form the right and left side surface of the housing of the pressure roller station.
  • the connecting part which connects the two side parts to one another, is preferably arranged centrally between the side parts, so that the three parts represent the shape of a capital letter "H" in the plan view. It is preferred that one of the two openings of the "H" faces the rotor, while the second opening of the "H" lies on the side of the pressure roller station facing away from the rotor, which in the sense of the invention is preferably referred to as the rear of the pressure roller station.
  • the described preferred arrangement of the open guide profile within the pressure roller station enables a surprisingly space-saving arrangement of the pressure roller station within the rotary press, whereby the rotary presses obtained can be made particularly compact. This advantageously saves volume, for example when transporting the rotary presses or, for example, when installing a large number of rotary presses in a machine hall.
  • the shape of the guide profile can preferably be referred to as box-shaped, the two side parts and the connecting part essentially enclosing right angles.
  • the side parts and the connecting part enclose angles that are smaller or larger than 90 °. Such angles are referred to in the sense of the invention as "essentially rectangular”.
  • the profiling of the guide profile is preferably carried out in such a way that an open structure with advantages for assembly, maintenance and service is created. This represents a departure from the closed design that is used in the prior art is described.
  • the pressure roller station known from the prior art was advantageously turned “from the inside out”. In this way, the drives and other components of the pressure roller station, such as guides or position measuring systems, are surprisingly easily accessible from the outside for troubleshooting and repairs without having to disassemble the entire pressure roller station.
  • the pressure roller receptacles are stored in the open guide profile.
  • the pressure roller holders serve to hold the pressure rollers.
  • the upper pressure roller receptacle is provided with an upper adjustment drive engaging the open guide profile and the lower pressure roller receptacle is provided with a receptacle and an overload protection device with a lower adjustment drive mounted in the upper pressure roller receptacle and engaging thereon.
  • the receptacle preferably represents the link between the upper and lower pressure roller receptacles. It is preferably provided that the receptacle includes the overload safety device, the lower adjustment drive and the bearing of a spindle. The upper and lower pressure roller receptacles therefore preferably do not interact directly, but are connected to one another via the spindle.
  • This spindle which connects the two pressure roller receptacles to one another, is preferably a trapezoidal threaded spindle, with which movements and high tensile forces can advantageously be transmitted.
  • the spindle is preferably mounted on the receptacle to which the overload protection is also attached.
  • the lower pressure roller receptacle is non-positively connected to the receptacle by the overload protection.
  • the spindle it is preferred that when the spindle is adjusted, the lower pressure roller receptacle and the receptacle are moved together so that they preferably form a coherent part and can be moved together.
  • the upper pressure roller receptacle, the receptacle and the lower pressure roller receptacle are arranged one behind the other on a common sliding guide plane. They slide, such as sledges, on the common sliding guide level.
  • the pressure roller station according to the invention preferably comprises flat guides as slide bearings, which are designed to be particularly play-adjustable. Due to the minimized guide play, the precision of the guidance of the pressure roller receptacles and thus the positioning of the pressure rollers are surprisingly improved.
  • the immersion depth of the upper pressure rams in the die can advantageously be set by means of the upper adjustment drive.
  • the web thickness of the tablet to be produced is preferably regulated.
  • the upper and lower punches of a rotary press work together in the die of a die plate in such a way that a tablet is pressed from the powder material to be compressed, which is located between the punches.
  • the underside of the upper stamp and the upper side of the lower stamp are shaped such that there is a cavity between the stamps, the shape of which essentially corresponds to the shape of the tablet.
  • the upper and lower punches are always guided through the control cams and rails so that the upper and lower punches do not touch during the pressing process.
  • the pressing tools could be damaged by the high pressing forces. It is therefore provided that there is always powder material to be pressed between the punches. Tablets are often thicker in the middle than on the wheels. This thickness can go to the edges decrease, it does not assume the value zero, which would be equivalent to an undesirable touch of the upper and lower punches. Tablets preferably have a thickness at their edges, which is referred to as web height or web thickness. In a preferred embodiment of the invention, this web height or web thickness can be set surprisingly precisely by means of the lower adjustment drive, whereby application tests have shown that undesired contact of the pressing tools by setting the web thickness by means of the lower adjustment drive, taking into account the position of the upper adjustment drive, is particularly safe be avoided.
  • An overload protection in the sense of the invention is preferably a device for protecting the tools in the rotary tablet press, for example if the pressing force acting between the two pressure rollers exceeds a predetermined value.
  • this predetermined value is preferably referred to as the pretensioning force.
  • the overload protection of the pressure roller station is a mechanical overload protection and comprises adjustable, tensionable disc springs.
  • a preferred mechanical design of the overload safety device with disc springs makes it possible to provide an overload safety device that only has to be adjusted once to the conditions in the rotary press before it is used for the first time.
  • disc spring preferably designates a conical annular shell which can be loaded in particular in the axial direction and can be stressed, for example, both at rest and in a swinging manner.
  • the use of disc springs as part of a mechanical overload safety device is particularly advantageous because, especially in a small space, disc springs can absorb large press forces, such as those that occur in a rotary press, and are characterized by a long service life. Through a suitable layering and series connection of individual disc springs and packages of disc springs a surprisingly good spring effect can be achieved.
  • the overload protection can also be a hydraulically operating overload protection. This is particularly advantageous if the overload protection is to be quickly adjusted to the maximum permissible load of the tools actually used when changing tools.
  • the upper and the lower pressure roller receptacles have sliding guides which can be adjusted and exchanged to minimize the bearing play.
  • play should preferably be understood as freedom of movement in which a mechanical component can be moved freely after assembly. It was completely surprising and represents a departure from the prior art to provide a pressure roller station in which the play within the sliding guide of the pressure roller station according to the invention is adjustable during assembly, which is not possible with the pressure roller stations described in the prior art. Rather, the experts had previously assumed that the play in pressure roller stations was determined solely by the manufacturing accuracy and could not be corrected after assembly.
  • the surprising adjustability of the slide guides is made possible by the use of the open guide profile according to the invention and the associated possibility of using milled components instead of turned components within a pressure roller station, the milled components in particular being surprisingly high Have manufacturing accuracy.
  • the pressure roller receptacles are preferably guided with slide guides in the form of slide strips.
  • slide bar preferably denotes a flat, thin and elongated component which is advantageously provided with a slide coating. The average person skilled in the art knows what material a surface is made of or how a surface is modified or treated so that it enables good sliding.
  • Another advantage of the pressure roller station according to the invention is that the guide strips can be replaced in a particularly simple manner by the open construction of the guide profile.
  • a wear-related replacement of a guide rail preferably only the affected guide rail needs to be replaced without dismantling the pressure roller station as a whole. This enables the replacement of wear-prone components, such as the guide rails, surprisingly easily, quickly and inexpensively.
  • the open guide profile has a front side and a rear side, the front side representing the side of the guide profile facing the rotor and the front side and the rear side of the guide profile being provided with cladding sheets.
  • the pressure roller station according to the invention preferably has an open guide profile, which represents the capital letter "H" in the plan view.
  • the side surfaces of the housing of the pressure roller station are preferably formed by the side parts of the guide profile.
  • the front of the guide profile preferably faces the rotor of the rotary press and in particular contains the pressure rollers.
  • the rear of the guide profile is preferably located essentially parallel to the front on the side facing away from the rotor of the rotary press.
  • the front and the back of the guide profile are preferably provided with cladding sheets, which can be provided, for example, with their own sealing profiles.
  • Cladding sheets in the sense of the invention are preferably essentially rectangular, thin, flat and flat metal plates made of preferably stainless steel, which are provided, for example, with holes on their circumference, by means of which the cladding sheets are connected in particular to the housing of the pressure roller station.
  • Screws are advantageous As a metallic connecting agent, for example in an ultrasonic bath, easy to clean and thus meet the high requirements for components in pharmaceutical systems.
  • alternative connecting means such as double-sided adhesive tape, Velcro fasteners and / or magnetic strips, are also conceivable for other purposes, without being limited thereto.
  • the use of screws as a connecting means makes it possible, in particular, to detach and remove the cladding plates from the pressure roller station in a particularly simple manner, as a result of which the internal components of the pressure roller station are surprisingly easily accessible. This is advantageous for user-friendly maintenance or repair of the components of the pressure roller station or for easier implementation of service measures or the replacement of worn or defective components.
  • the guide profile of the pressure roller station has an air cushion on its underside.
  • the use of an air cushion on the underside of the pressure roller station according to the invention surprisingly reduces the frictional force between the guide profile and a carrier plate, which enables particularly good mobility of the pressure roller station on a carrier plate of the rotary press.
  • Relocation work of the pressure roller stations can now also be carried out by operators who were previously excluded from this work due to the physical strain caused by the weight of the pressure roller stations, which considerably facilitates the deployment of personnel and personnel planning becomes.
  • the pressure roller station is preferably attached to a carrier plate which represents the upper end of the drive base of the rotary press.
  • the pressure roller station is preferably connected via a fastening flange to a central tensioning unit and / or with connecting means, preferably screws, along the circumference of the guide profile of the pressure roller station with the vibration-decoupled carrier plate.
  • connecting means preferably screws
  • the pressure roller station in a preferred embodiment comprises an air cushion on its underside to reduce the frictional force between the guide column and a carrier plate.
  • air cushions are preferably generated by means of compressed air between the underside of the pressure roller station and the carrier plate.
  • the air cushion is only switched on when the pressure roller station has to be moved manually for a different configuration for service or conversion purposes.
  • the air cushion in particular does not raise the pressure roller station. Instead, the upward force of the compressed air is preferably such that the frictional force on the base plate generated by the weight of the pressure roller station is minimized.
  • the air cushion is created by preferably filling a flat cavity on the underside of the pressure roller station with pneumatic pressure.
  • This cavity preferably has a height of 1 to 2 mm and preferably corresponds to the dimensions of the base of the guide profile of the pressure roller station.
  • the pressure for generating the air cushion is preferably in a range from 2 to 4 bar and is preferably provided by the pneumatic installation of the rotary press by a pressure reducing valve. So that the air on the sides of the cavity cannot escape when the air cushion is built up, it is preferred that there is a seal all around the cavity, which advantageously seals the cavity against the base plate.
  • the air cushion can be connected permanently or temporarily by coupling a pressure hose.
  • the compressed air is preferably supplied via the carrier plate of the drive base.
  • the pressure supply is switched off when the pressure roller station is tensioned or screwed on in the production position.
  • the automatic tensioning by the central tensioning device or the screw fastening of the pressure roller station must be released, which then leads to a safe use of the air cushion.
  • the pressure roller station comprises sensors for measuring the pressing force.
  • the pressure roller axes are preferably equipped with strain gauges (DMS) to determine the pressing force.
  • strain gauges are preferably measuring devices for detecting stretching and / or compressing deformations. It is preferred that they change their electrical resistance even with slight deformations, which is why they are particularly suitable as strain sensors. It is preferred that they be attached to components that deform minimally under load in a suitable manner known to those of ordinary skill in the art. This deformation or expansion advantageously leads to a change in the resistance of the strain gauge.
  • the lower pressure roller axis is provided with such a strain gauge in the pressure roller station according to the invention.
  • the upper pressure roller axis or both pressure roller axes are provided with strain gauges.
  • the strain gauges preferably cover a force range of 20 to 100 kN in stages.
  • the pressure roller station is displaceable, pivotable and / or mounted on a support plate about a vertical point of the open guide profile.
  • the pivot point is preferably not necessarily the intersection of the diagonals of the open guide profile.
  • the fulcrum can be a fixed point that is located on the side of the fastening surface of the guide profile.
  • the pivoting of the at least one pressure roller station can preferably be carried out either manually by arm force or in an automated manner.
  • the pressure roller station to be rotated is advantageously touched directly, or a handle is used.
  • the invention relates to the use of the pressure roller station according to the invention, the plate springs of the overload protection being set by means of a pretensioning force in such a way that the lower pressure roller receptacle detaches from the receptacle when a pressing force acting between the pressure roller receptacles exceeds the pretensioning force.
  • the pretensioning force is generated by the layered disc springs. These are preferably compact and strong and are suitable, for example, to ensure pretensioning forces of up to 150 kN in the available installation space.
  • the stratification and series connection of the springs is necessary in order to increase the preload and the required stroke when the overload safety device responds.
  • the overload safety device preferably returns automatically to its starting position when the pressing force drops below the set pretensioning force. It is preferred that the non-positive connection between the lower pressure roller receptacle and the receptacle is advantageously realized by the spring force of the plate springs forming the overload protection.
  • the preload force is exceeded, for example, in the case of so-called "overpressures” if there are pressed residues of compacts in the die of the rotary press, in which the upper and lower punches work together and form the compact through this interaction, which cannot be further compressed.
  • the overload protection can also be triggered, for example, by overfilled matrices.
  • the pressing process and the position of the Pressure rollers with respect to one another are preferably matched to the filling level and the characteristics of the molding compound, in particular their bulk density and the compression ratio. In the event of overpressing, the pressing force can increase significantly and damage the tools and the pressure roller station.
  • the lower pressure roller receptacle moves downward and detaches from the receptacle when the pressing force reaches or exceeds the spring-preloaded force or the preloading force of the overload safety device. This advantageously increases the distance between the upper and the lower pressure roller, and the pressing force cannot exceed the set, spring-loaded force of the overload protection. If the pressing force drops again, it is preferred in the sense of the invention that the lower pressure roller receptacle again engages the receptacle in a force-fitting manner.
  • the lower pressure roller holder and the holder move through the non-positive connection, which is realized by the spring force of the plate springs of the overload protection device, preferably as a coherent part, if the web height of the tablets to be produced matches the lower one Adjustment drive is set.
  • the pretensioning force is up to 100 kN, preferably up to 125 kN and particularly preferably up to 150 kN. It was completely surprising that a compact rotary press can be provided with a new arrangement for overload protection that differs from the prior art and has enough space to provide pretensioning forces of the magnitudes mentioned.
  • the overload protection comprises a safety switch, by means of which the rotary press is switched off either when the pressing force exceeds the prestressing force or after an adjustable number of such events. It is preferred that, depending on the programming and the requirements for the tablet press, the pressing process is stopped either immediately or after an adjustable number of overpressing events. Such events occur in cases of overpressures, which occur when compressed residues of the tablet powder to be compressed, for example, remain in the die of the rotary tablet press can no longer be compressed. Overpressures can also occur, for example, if the die is filled with too large a quantity of tablet powder to be compressed if the web height is set too low.
  • the switch can preferably be a proximity initiator.
  • a proximity initiator is a sensor that reacts to proximity, i.e. without direct contact, without contact.
  • the switch is a microswitch or an optical sensor. The average specialist knows what other types of switches can be used for overload protection.
  • the pressing process and the position of the pressure rollers relative to one another are preferably matched to the filling height of the tablet powder and the properties of the molding compound, such as bulk density and compression ratio, overpressures can occur and damage to the pressing tools and the pressure roller station can be caused by the rapidly increasing pressing force.
  • the tablet press is switched off in the event of a single overpressing event. In other cases, however, it may also be preferred to stop the tablet press only after a predetermined number of overpress events. This can be indicated, for example, when the compressed tablet powder residues, based on experience and due to the nature of the powder, automatically detach from the matrices.
  • the use of the switch for electrical monitoring of the triggering of the overload protection which can also be programmed and thus adapted to the specific requirements of the manufacturing process, ensures particularly flexible use of the overload protection.
  • the pressure roller station has at least one sensor for distance measurement.
  • the pressure roller station can have one or two sensors.
  • the sensors for distance measurement or distance measuring systems are preferably linear distance measuring systems which in particular continuously record measured values.
  • position measuring systems can be used which have high accuracy, as well as good repeatability and linearity, and that such position measuring systems can be selected from the group non-contact, with touch, magnetic, optical or inductive measurement.
  • the upper adjustment drive for the immersion depth adjustment has a spindle which is positively and / or non-positively connected to the upper adjustment drive and a releasable brake which blocks the spindle from the housing of the adjustment drive when actuated.
  • This blockage advantageously interrupts the flow of force between the upper pressure roller seat and the upper adjustment drive, so that a surprisingly large braking effect is achieved.
  • the lower adjustment drive for the web thickness adjustment has a spindle which is positively and / or non-positively connected to the lower adjustment drive and a brake which blocks the spindle in relation to the receptacle when actuated.
  • the brakes for fixing the drives in the de-energized state are effective at the last point of the power flow on the respective motor. It was surprising that the brakes can be arranged in the pressure roller station according to the invention in such a way that they act directly on the spindle as a force transmission element, which represents a departure from the prior art and has so far not been considered by experts. In the pressure roller station according to the invention, the brakes are therefore preferably arranged directly on the spindles for adjusting the web height and the immersion depth. Long transmission paths of the braking effect are thus surprisingly avoided and a rotational movement of the spindles in the event of the pressure rollers straying apart is particularly effectively prevented by the locking of the spindles.
  • the motor and transmission advantageously only have to work against the pressing force when the upper pressure roller receptacle and the lower pressure roller receptacle are adjusted during the pressing process. After completion of the adjustment process in the braked position, the motors and transmissions are advantageously again free of torque and forces and are therefore not subject to the pressing force and the fluctuations in the pressing force.
  • the brakes can preferably be designed both positively and non-positively. It is preferred that the releasable brakes are braked in the unactuated, de-energized or depressurized state, while in the actuated state they are opened for the adjustment process of the respective adjustment drive.
  • the brake is actuated electrically, pneumatically and / or hydraulically.
  • the brake is preferably actuated pneumatically.
  • electrical or hydraulic actuation it can also be preferred for electrical or hydraulic actuation to take place. It was surprising that any automatically operating brake actuation can be used in a pressure roller station in such a way that the brake is effective directly on the power transmission element and does not have to be attached behind the engine and the transmission.
  • Figure 1 shows a section through the pressure roller station (100) according to the invention.
  • the front (115), back (116) and underside (118) of the pressure roller station (100) are shown in particular.
  • the front (115) of the pressure roller station (100) faces the rotor (91) of the tablet press (90).
  • the rear (116) of the pressure roller station (100) is arranged essentially parallel to it and faces away (90) from the rotor (91) of the tablet press.
  • parallel also includes “essentially parallel” areas, “substantially parallel” areas having a deviation from parallelism of preferably not more than 6 °, most preferably not more than 3 °.
  • cladding plates (96, 97) which close off the front (115) and the back (116) of the open guide profile (1) and are fastened to the housing of the pressure roller station (100) with connecting means (98), in particular screws.
  • connecting means (98) are exemplified in Fig. 1 marked.
  • the cut in Fig. 1 goes centrally through the guide column (1) of the pressure roller station (100), so that the parallel side parts (112, 113) of the open guide profile (1) in Fig. 1 cannot be seen. However, you can see the connecting part (114) of the guide profile (1), which connects the two side parts (112, 113) to each other.
  • the connecting part (114) gives the guide profile (1) its particular stability.
  • Pressure roller receptacles (2, 3) that hold and hold the pressure rollers (40, 50).
  • the pressure roller mounts (2, 3) are stored in the guide profile (1).
  • the upper pressure roller seat (2) has an upper slide guide (103)
  • the lower pressure roller seat (3) has a lower slide guide (104) with which the pressure roller seats (2, 3) are slidably guided on a common sliding plane.
  • the slide guides (103, 104) consist of milled, high-precision components that enable the adjustment of a later correctable play when installing the slide guides (103, 104).
  • the two pressure rollers (40, 50) can be adjusted against each other, which is caused in particular by the spindle (18). This allows the web thickness to be adjusted.
  • the pressure roller receptacles (2, 3) are connected to the slide guides (103, 104) via pressure roller axes (20).
  • the upper pressure roller holder (2) is attached with an upper adjustment drive (4) engaging the guide profile.
  • the upper adjustment drive (4) is used to adjust the upper pressure roller (40) and thus to adjust the immersion depth of the upper punch (56) acted upon by the upper pressure roller (40), as well as for the common, i.e. parallel adjustment of the upper pressure roller (40) and the lower one Pressure roller (50) at a fixed distance.
  • This allows the compression zone of the rotary tablet press (90) to be set. This is advantageous because it enables different areas of the dies in the die plate to be selected and approached. As a result, different areas of the die are stressed during the pressing process, whereby the service life of the dies can be extended by utilizing the entire die height.
  • the lower pressure roller receptacle (3) is provided with a lower adjustment drive (5) by means of a receptacle (108) and an overload protection device (109), the lower adjustment drive (5) being mounted on the upper pressure roller receptacle (2) and on this upper pressure roller receptacle ( 2) attacks.
  • the upper and lower pressure roller receptacles (2, 3) do not interact directly via the spindle (18).
  • the spindle (18) is mounted on the receptacle (108) to which the overload protection (109) is also attached.
  • the lower pressure roller holder (3) is non-positively and indirectly connected to the holder (108).
  • the lower Adjustment drive (5) for the lower pressure roller (50) together with the spindle (18) serves to adjust the web thickness relative to the upper pressure roller (40).
  • the geared motor (6) interacts with another spindle (7), which is used to adjust the immersion depth of the upper punches (56).
  • the brake for the immersion depth adjustment (105) and the brake for the web thickness adjustment (107) are attached directly to the spindles (7, 18).
  • the brakes (105, 107) thus act directly on the force transmission elements, that is to say the spindles (7, 18).
  • the spindles (7, 18) also endeavor to rotate.
  • the brakes (105, 107) prevent the spindles (7, 18) from moving.
  • the spindle (7) for setting the immersion depth in relation to the housing (106) of the upper adjustment drive (4) is blocked, as a result of which the flow of force between the upper pressure roller holder (2) and the adjustment drive (4) is interrupted.
  • the spindle (18) for adjusting the web thickness is blocked with respect to the receptacle (108), which results in an interruption in the flow of force between the lower pressure roller receptacle (3) and the lower adjustment drive (5).
  • the upper pressure roller holder (2) can be moved vertically up and down in the guide column (1) by actuating the geared motor (6) in cooperation with the spindle (7) and the upper slide guide (103), whereby the immersion depth of the upper punches (56) is set.
  • the lower pressure roller holder (3) can be moved vertically up and down in the guide column (1) by actuating the gear motor (13) in cooperation with the spindle (18) and the lower slide guide (104), whereby the web thickness is adjusted.
  • a mechanical overload safety device (109) is shown, by means of which a prestressing force is generated by means of tensionable disc springs (117).
  • This pretensioning force brings about the non-positive connection between the lower pressure roller seat (3) and the seat (108).
  • the overload protection (109) protects the pressing tools, such as the upper punches (56) and lower punches (57), against loads caused by excessive pressing forces. It is formed by layered and series-connected disc springs (117) or packages of disc springs.
  • Exceeds the pressing force between the pressure rollers (40, 50) the pre-tensioning force set on the overload safety device (109) the lower pressure roller holder (3) releases from the holder (108) and slides downwards.
  • the pressing force can therefore not exceed the prestressing force, which prevents damage to the pressing tools (56, 57) and the pressure rollers (40, 50) of the rotary press (90).
  • the overload protection (109) is provided with a switch (110), by means of which the rotary press (90) can be switched off. This can either happen if the pressing force between the pressure rollers (40, 50) exceeds the pretensioning force of the overload protection (109), or if there is an adjustable number of overpressing events.
  • FIG. 1 an air cushion (111) which is attached to the underside of the pressure roller station (100).
  • This air cushion (111) enables the pressure roller station (100) to move on a carrier plate (29) with a reduced frictional force.
  • the air cushion (111) is generated in a cavity below the pressure roller station (100), and the compressed air supply can be permanently or temporarily connected.
  • the air cushion (111) is preferably supplied with compressed air via a supply connection to the pressure roller station (100). This is advantageous because the pressure conditions can be adapted to the requirements of producing an air cushion (111) which is matched to the pressure roller station (100). However, it can also be preferred that the compressed air supply is provided via the carrier plate (29) of the rotary tablet press (90).
  • Fig. 2 shows a longitudinal section through a preferred embodiment of the pressure roller station, the position of the sensors for displacement measurement (101, 102) and for measuring the pressing force (119) being shown in particular in Fig. 2 the positions of the sensors for displacement measurement (101, 102), or the displacement measurement systems, are shown. These are preferably linear path measuring systems that continuously record measured values.
  • the sensor for pressing force measurement (119), which is a strain gauge, can also be seen.
  • the sensor for pressing force measurement (119) is in the Fig. 2 shown embodiment of the invention attached to the lower pressure roller holder (3).
  • the strain gauge changes its electrical resistance in the event of mechanical deformation, this change in resistance acting as an electrical signal for determining the pressing force is used. This electrical signal is forwarded via a line connection (120) for the electrical signal of the pressing force sensor.
  • Fig. 3 shows a side view of a preferred embodiment of the pressure roller station (100). It can be seen that the pressure roller station (100) in this preferred embodiment is fastened to the carrier plate (29) of the rotary press (90) by means of a fastening flange (92) and connecting means (93). Fig. 3 further shows one of the two side surfaces (112) of the open guide profile (1) of the pressure roller station (100), as well as its front (115) and its rear (116). The front side (115) of the pressure roller station (100) faces the rotor (91) of the rotary tablet press (90), while the rear side (116) is on the side of the pressure roller station (100) facing away from the rotor (91). Fig.
  • FIG. 3 also shows the upper (40) and lower (50) pressure rollers of the pressure roller station (100). Furthermore shows Fig. 3 the upper (56) and lower (57) pressing tools, i.e. the upper punches (56) and the lower punches (57) of the rotary tablet press (90), which are pressed together by means of the upper (40) and lower (50) pressure rollers for the purpose of tablet formation become.
  • Fig. 4 shows a plan view of a preferred embodiment of the pressure roller station (100), in which the H-shape of the open guide profile (1) is clearly recognizable, which by the two essentially parallel side parts (112, 113) and the connecting part running essentially perpendicular thereto (114) is formed.
  • the side parts (112, 113) form the side surfaces of the pressure roller station (100).
  • This top view also shows the fastening flange (92) and the connecting means (93) with which the pressure roller station (100) is fastened to the carrier plate (29) of the rotary tablet press (90).
  • Fig. 4 illustrates the open structure of the guide profile (1), which is closed at the front (115) and the rear (116) of the pressure roller station (100) with a cladding plate (96, 97).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP15722984.0A 2014-05-07 2015-05-06 Druckrollenstation für rundlaufpressen mit zwei druckrollenaufnehmenden druckrollenachsen Active EP3140110B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14167415 2014-05-07
PCT/EP2015/059946 WO2015169852A1 (de) 2014-05-07 2015-05-06 Druckrollenstation für rundlaufpressen mit zwei druckrollenaufnehmenden druckrollenachsen

Publications (2)

Publication Number Publication Date
EP3140110A1 EP3140110A1 (de) 2017-03-15
EP3140110B1 true EP3140110B1 (de) 2020-03-18

Family

ID=50679909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15722984.0A Active EP3140110B1 (de) 2014-05-07 2015-05-06 Druckrollenstation für rundlaufpressen mit zwei druckrollenaufnehmenden druckrollenachsen

Country Status (7)

Country Link
US (1) US10500807B2 (ja)
EP (1) EP3140110B1 (ja)
JP (1) JP6294975B2 (ja)
KR (1) KR101831096B1 (ja)
CN (1) CN106660292B (ja)
ES (1) ES2787903T3 (ja)
WO (1) WO2015169852A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4051494B1 (de) 2019-10-30 2023-10-04 Korsch AG Druckrollenstation für rundlaufpressen mit aussenliegenden achsenaufnahmen für druckrolleneinheiten
CN113976845B (zh) * 2021-11-22 2023-05-26 马钢集团设计研究院有限责任公司 一种连铸铸流气动自动调节导向装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2846723A (en) * 1957-02-27 1958-08-12 Stokes F J Corp Rotary tablet press
GB842189A (en) 1957-12-14 1960-07-20 John Holroyd & Company Ltd Improvements in or relating to rotary compacting machines
US3891375A (en) * 1974-01-21 1975-06-24 Vector Corp Tablet press
DE19705092C1 (de) 1997-01-31 1998-03-26 Korsch Pressen Gmbh Druckrolleneinheit für Rundlaufpressen
US6106262A (en) 1997-12-25 2000-08-22 Metropolitan Computing Corporation Press simulation apparatus
JP3558944B2 (ja) * 1999-02-09 2004-08-25 株式会社グローバル・ニュークリア・フュエル・ジャパン 粉末成形機
US6767200B2 (en) * 2001-09-28 2004-07-27 Mcneil-Ppc, Inc. Systems, methods and apparatuses for manufacturing dosage forms
EP1354694A3 (de) 2002-04-18 2005-12-28 Baltec Maschinenbau Ag Verfahren und Vorrichtung zum Überwachen einer Bremse an einer Spindel
DE102004040163C5 (de) * 2004-08-19 2009-06-18 Fette Gmbh Rundläufertablettenpresse
JP5184969B2 (ja) * 2008-05-28 2013-04-17 モリマシナリー株式会社 ロータリプレス
DE102009020196A1 (de) * 2009-05-07 2010-11-11 Korsch Ag Rundlaufpresse insbesondere zur Herstellung von Tabletten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN106660292B (zh) 2018-06-05
US20170050401A1 (en) 2017-02-23
WO2015169852A1 (de) 2015-11-12
WO2015169852A4 (de) 2015-12-30
CN106660292A (zh) 2017-05-10
EP3140110A1 (de) 2017-03-15
KR101831096B1 (ko) 2018-02-21
JP2017517398A (ja) 2017-06-29
US10500807B2 (en) 2019-12-10
KR20170003620A (ko) 2017-01-09
ES2787903T3 (es) 2020-10-19
JP6294975B2 (ja) 2018-03-14

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