Rotary press and method for pre-cleaning press housing of rotary press

Abstract

The invention relates to a rotary press comprising a press housing (54) and a rotor (56) arranged in the press housing, the rotor having an upper and a lower die guide (18, 20) for an upper and a lower press die (14, 16) and a die plate (10) between the die guides, the invention relates to a press device (10) for pressing a material, comprising an upper press die (14) and a lower press die (16) which interact with a receptacle (12) of the die disc, further comprising at least one filling device (26) in which the material to be pressed is filled into the receptacle, and further comprising at least one pressure device (34) which, during operation, interacts with the upper press die and the lower press die, the upper pressing die and the lower pressing die press the material in the receiving portion into a compact, and the rotary press comprises a throwing device (44) for the compact produced in the rotary press. The invention further relates to a method for pre-cleaning a press housing of such a rotary press.

Description

TECHNICAL FIELD

[0001] The invention relates to a rotary press comprising a press housing and a rotor arranged in the press housing, wherein the rotor has upper and lower die guide devices for upper and lower pressing dies and a die disc between the die guide devices, wherein the pressing dies cooperate with a receiving portion of the die disc, further comprising at least one filling device in which a material to be pressed is filled into the receiving portion, further comprising at least one pressure device which cooperates with the upper and lower pressing dies in operation, so that the upper and lower pressing dies press the material in the receiving portion into a press compact, and comprising an ejection device for press compacts produced in the rotary press.

[0002] The invention furthermore relates to a method for pre-cleaning a press housing of a rotary press according to the invention and a method for introducing an atomizing nozzle into a press housing of a rotary press according to the invention. BACKGROUND

[0003] In a rotary press, a plurality of upper and lower pressing dies is usually provided, which are respectively arranged in pairs to the cavities of a die disc. In the operation of the rotary press, the upper and lower pressing dies are co-rotated with the die disc, wherein their axial movement is controlled by a control curve and guided by the upper and lower die guide devices. In the course of the rotation, the die disc passes through different devices of the rotary press, namely a filling device, in which a powder material to be pressed is guided into the cavities of the die disc, and a pressure device, in which the upper and lower pressing dies are usually pressed into the cavities by upper and lower pressure rollers for pressing the powder material into press compacts, such as tablets. Following the pressure device, the upper pressing dies are guided out of the cavities upwards and the press compacts produced in the cavities are pushed by the lower pressing dies onto the upper side of the die disc. For this purpose, an ejection curve is provided, which moves the lower pressing dies correspondingly upwards. The press compacts are then scraped from the die disc into an output of the rotary press, for example by a scraper, from where they are transported to further processing.

[0004] Product dust is generated in the manufacture of compacts in rotary presses, for example when conveying the powder-like material to be pressed, when pressing the material into compacts or when ejecting the manufactured compacts. The product dust can remain in the press housing and must be suctioned out completely or partially by hand if necessary, for example during product change or during the exchange of components of the rotary press, such as punches or other wearing parts. In particular, it should be prevented that the pressing dust reaches the environment when opening the press housing and can pose a health risk there, for example in the case of pharmaceutical materials. To protect the operating personnel, personal protective equipment is used to date. To remove the product dust on the surfaces of the rotary press, for example on the window flap of the press housing, dry cleaning, for example manual suction, is known. With dry cleaning, the product dust cannot always be completely removed from the surfaces and in particular from the air.

[0005] It is also known to clean the rotary press, in particular the press housing, comprehensively by spraying with a cleaning liquid. For this purpose, the cleaning liquid can be sprayed onto the surfaces of the interior of the rotary press, in particular the press housing, using a spraying device in order to bind and flush away the powder residues. The problem here is that a liquid accumulation forms on the level of the press housing based on the amount of liquid required for cleaning the surfaces, which must be laboriously drained after the cleaning has ended. This applies in particular when the remaining cleaning liquid is drained based on the level not by gravity through the discharge slots provided for this purpose. Corrosion of the surfaces of the press housing and increased drying and cleaning effort also occur through the liquid remaining in the press housing. Furthermore, an external liquid feed must be connected to the rotary press in order to bring the cleaning liquid into the interior of the rotary press.

[0006] In DE 10 2008 046 670 Al, therefore, in order to drain the cleaning liquid accumulated on the level, it is proposed that the press housing or the entire tablet press is tilted by an actuator by a tilting angle, so that the cleaning liquid collected in the press housing can be drained through the discharge slots. Of course, significant structural and temporal effort is associated with this. SUMMARY

[0007] Therefore, starting from the explained prior art, it is the task of the present invention to provide a rotary press and a method of the type initially mentioned with which the interior of the press housing can be freed from product dust in an efficient and less effort-intensive manner compared to the prior art.

[0008] The invention solves the stated task by the independent claims. Advantageous designs are in the dependent claims, the description and the figures.

[0009] For a rotary press of the type mentioned at the outset, the invention solves the task in that a binder tank containing a liquid binder is arranged in or outside the press housing, at least one atomizing nozzle is arranged in the press housing, and between the binder tank and the atomizing nozzle, a binder line extends at least partially within the press housing, wherein a conveying device is arranged which, in operation, conveys binder from the binder tank through the binder line to the atomizing nozzle, so that the atomizing nozzle generates a spray from the binder within the press housing which binds dust in the press housing.

[0010] The invention also solves the task by a method for pre-cleaning a press housing of a rotary press according to the invention, wherein a spray from the binder is generated by the atomizing nozzle within the press housing which binds dust in the press housing.

[0011] The basic construction of a rotary press as subject matter of the invention or used in the method according to the invention is explained at the outset. As explained, an upper punch guide and a lower punch guide guide the pressing punches in their axial movement. The punch heads interact with a control curve which moves the pressing punches in axial direction during their rotation with the rotor, in particular towards and away from each other. The control curve is usually constructed from a plurality of control curve elements. The control curve can receive the punch heads in corresponding guide receptacles or only abut against mirror surfaces of the punch heads. The pressure device usually has an upper and a lower pressure roller which interact with the punch heads of the upper or lower pressing punch. A plurality of such pressure devices, for example a pre-pressure device and a main pressure device, can also be provided. The ejection curve as part of the control curve moves the lower pressing punch after the production of a press compact in the corresponding mold cavity upwards, so that the corresponding press compact reaches onto the upper side of the mold plate, from where it can be guided onto a tablet outlet, for example by a wiper which is arranged stationary above the mold plate.

[0012] According to the invention, at least one atomizing nozzle, for example two or more atomizing nozzles, is provided in the press housing. Between the binder tank and the atomizing nozzle, which is provided in or on the press housing, a binder line is provided, which extends at least partially in the press housing. By means of the conveying device of the rotary press, in particular a liquid binder is conveyed from the binder tank through the binder line to the atomizing nozzle, wherein the atomizing nozzle atomizes the conveyed binder to a spray in the press housing, which binds dust, i.e. product dust, present in the press housing, in particular in the air of the press housing, from the material, in particular in powder form, being pressed in the rotary press, and thereby renders it harmless. The atomizing nozzle here in particular only produces a spray, i.e. does not directively spray the liquid onto the surface of the press housing as a purging lance. The dust bound by the binder spray together with the spray slowly falls down in the press housing caused by gravity. The spray consisting of the liquid binder here on the one hand binds dust present in the air inside the press housing and on the other hand also binds dust on the surface of the press housing. In this way, the interior space of the press housing is freed of product dust, which is for example harmful to the operating personnel. According to the invention, a pre-purification is provided, which does not increase the pharmaceutical purification requirements in the sense that the system after carrying out the method according to the invention can be used without further purification. If necessary, additional purification of the press housing, for example suction of the bound dust or the like, can be carried out in accordance with the method according to the invention. The invention is based on the insight that by cleaning the dust in the press housing according to the invention in such a way that the dust is bound in the manner according to the invention, for example access to the press interior space is also possible without risk without additional protective measures which are costly. At the same time, the effort associated with atomizing a large amount of purifying liquid for leading the liquid out of the press interior space is avoided.

[0013] The binder is conveyed from a binder tank, which can be installed in the press housing or else in or on the rotary press. The atomizing nozzle can be, for example, a two-component nozzle for generating a spray mist, which is processed by the atomizing nozzle and sprayed as a spray mist air-liquid mixture. The atomizing nozzle or the plurality of atomizing nozzles can be arranged above the rotor of the rotary press. The spray mist generated by the atomizing nozzle distributes itself automatically over the entire interior space of the press housing in contrast to a purifying liquid sprayed, for example, by a spray gun on a face of the press housing and thus effectively binds the dust in the entire interior space of the press housing. The operation of the conveying device for generating the spray mist by the atomizing nozzle can be initiated, for example, by an operator, for example, by means of an operating interface (Human Machine Interface, HMI) of the rotary press. The atomizing nozzle can be preassembled in the press housing or introduced as required for the process according to the application, as explained in more detail below.

[0014] By the generation of the spray mist according to the application by means of a binder of a liquid, which is distributed over the press housing, on the one hand, a widespread distribution of the spray mist in the press housing is ensured. It is thus not necessary to spray determined regions of the press housing with purifying liquid in a targeted manner. By generating the spray mist and the uniform distribution of the spray mist in the interior space of the press housing, moreover, the accumulation of liquid on, for example, horizontal surfaces of the press housing, in particular the formation of puddles, is avoided. Correspondingly, it is not necessary to lead the liquid out of the press housing by means of a discharge channel after the end of the pre-purification process, that is to say after the end of the generation of the spray mist. It is accordingly possible for the press housing according to the application or the rotary press according to the application not to have a discharge channel for purifying liquid.

[0015] The effective and reliable binding of dust from the material to be pressed in the rotary press according to the application takes place in a structurally and temporally less complex manner. At the same time, the corrosion of surfaces of the press housing is avoided. The dust bound by the spray mist is no longer aerosolizable, so that the dust cannot be distributed in the environment in an opened press housing and accordingly cannot be inhaled by an operator. A high operator protection can be achieved without the need for a complete flushing of the press housing in the manner provided in the prior art. A discharge of the purifying liquid from the rotary press, in particular from the press housing, is not necessary. The complex external media feed for the purifying liquid is also avoided by means of the binder tank and the binder line. By binding the dust in the air, depending on the assessment or responsible judgment of the operator, the opening of the press housing by the operator is possible without comprehensive protection if necessary. The assembly and, if necessary, the disassembly of the components according to the application is simple.

[0016] According to one design, a control device can be provided which is designed to operate the conveying device for a time interval of less than five minutes, preferably less than two minutes, further preferably less than one minute, in particular less than 30 seconds, further in particular less than 20 seconds, for conveying the adhesive from the adhesive tank to the atomizing nozzle via the adhesive line and thereby for generating a spray by the atomizing nozzle. During the operation of the conveying device, the atomizing nozzle continuously generates a spray from the conveyed adhesive. By the operation of the conveying device and thereby the generation of the spray according to the above-mentioned design only takes place for a short time interval, for example for a time interval of less than 30 seconds, in the case of reliable bonding of the dust in the press housing, a large liquid delivery into the interior of the press housing is avoided, so that a gathered liquid quantity on the surface of the press housing and thereby a corrosion risk or a necessary removal of these liquid accumulations is reliably avoided. The control device can be integrated into a machine control device for controlling the operation of the rotary press or form a separate control device.

[0017] According to one particularly practical design, the adhesive tank can be arranged on the outside of the press housing. The adhesive line can then extend from the adhesive tank to the atomizing nozzle via a dust-tight opening of the press housing. In particular, the adhesive tank can be docked to the press housing via a rapid transfer port (RTP). This design allows on the one hand a particularly simple and standardized assembly of the adhesive tank, including the connection of the adhesive line between the adhesive tank and the atomizing nozzle. On the other hand, the design is particularly suitable for use in airtight presses, since an opening of the press housing and thereby a destruction of the airtightness is not necessary or possible without destroying the airtightness via a dust-tight opening, for example a rapid transfer port. Correspondingly, the rotary press according to the invention can be an airtight rotary press, as will be explained further below.

[0018] The adhesive can comprise water and / or a purifying agent and / or a corrosion inhibitor. Water forms a particularly effective adhesive for the product dust. As already explained, an air-water mixture can be processed by the atomizing nozzle for generating a spray or released as a spray. As soon as the adhesive additionally contains a purifying agent, the purifying action can be improved in particular when the adhesive deposits on the surface of the press housing. A corrosion inhibitor contained in the adhesive also reliably prevents corrosion of the surface of the press housing which comes into contact with the spray.

[0019] The conveying device can have a compressed air device which conveys the adhesive from the adhesive tank to the atomizing nozzle by means of compressed air. In this way, the adhesive can be conveyed in a particularly reliable and simple manner.

[0020] According to another design, the atomizing nozzle can be deflectably arranged in the press housing, wherein a deflection drive is arranged, which deflects the atomizing nozzle during the generation of the spray in the press housing. The deflection of the atomizing nozzle by the deflection drive can be carried out in particular automatically as soon as the binder is conveyed from the binder tank to the atomizing nozzle by the conveying device and the atomizing nozzle thus generates a spray. By the deflection of the atomizing nozzle during the generation of the spray, a particularly large range and uniform distribution of the spray in the press housing can be achieved. The dust binding action is further improved and the risk of puddles accumulating on the surface is further reduced.

[0021] The atomizing nozzle or the plurality of atomizing nozzles can be arranged on one or a plurality of nozzle carriages, wherein the one nozzle carriage or the plurality of nozzle carriages has a deflection drive. The deflection drive can be a pneumatically operated deflection drive in a particularly practical manner. The nozzle carriage can also have a rotary distributor. The rotary distributor allows the binder lines, in particular air and / or water lines, to be moved without having to be moved together when the atomizing nozzle is moved.

[0022] As already explained, the atomizing nozzle or the plurality of atomizing nozzles can be arranged above the rotor in the press housing. Thereby an optimized distribution of the spray in the press housing by gravity is achieved.

[0023] According to another design, it can be provided that the rotary press is a closed rotary press comprising an extraction device, wherein the extraction device generates a negative pressure in the press housing relative to the environment of the press housing. The rotary press can for example have a closed class of 0EB3 or more, which is for example measured according to the SMEPAC test (Standardised Measurement of Equipment Particulate Airborne Concentration). In such a closed rotary press, an extraction device is usually arranged, which generates a negative pressure in the press housing relative to the environment, so that possible toxic product dust cannot reach the environment, but is extracted from the press housing.

[0024] According to another design, a control device can then be provided, which manipulates the suction device in such a way that the suction device generates a negative pressure in the press housing relative to the environment of the press housing during the generation of the spray by the atomizing nozzle in the press housing, wherein the spray is distributed in the press housing by the flow of the turbulent flow generated by the suction device. The control device can be integrated into the machine control of the rotary press or be a separate control device. In particular, a control device can be involved which also manipulates the control device for the delivery device for the binder and, if necessary, also the deflection drive for deflecting the atomizing nozzle. By suction, a turbulent air flow is generated in the press housing, which flow facilitates the distribution of the spray in the entire press housing, in particular also on areas which are not in the direct jet area of the atomizing nozzle, for example because they are covered by components in the press housing. Such areas can advantageously be reached by the flow generated by the suction.

[0025] According to another design, the atomizing nozzle can be detachably provided in the press housing. The binder tank and / or the binder line can also be detachably provided. The same applies to a nozzle holder which, if necessary, holds the atomizing nozzle. In this way, it is possible to assemble or disassemble the components as required, respectively.

[0026] The rotary press can furthermore have a manually manipulable spray gun with which an operator can spray an area within the press housing with binder, in particular binder from the binder tank. Correspondingly, the spray gun can likewise be fed from the binder tank which feeds the atomizing nozzle. However, it is also possible that a separate binder tank, for example comprising a liquid purifying agent, is provided for the spray gun. The manually manipulable spray gun can likewise generate a spray which binds dust in the press housing. In this way, the operator can manually spray areas of the press housing which are inaccessible to the atomizing nozzle, for example filling devices.

[0027] The invention also relates to a method for introducing an atomizing nozzle into a press housing of a rotary press according to the invention, wherein the atomizing nozzle and, if necessary, a nozzle holder holding the atomizing nozzle is introduced into a container outside the press housing, wherein the container is subsequently introduced into the press housing through a delivery opening of the press housing, in particular a dust-tight delivery opening, for example a quick transfer port, and wherein the atomizing nozzle and, if necessary, the nozzle holder holding the atomizing nozzle is subsequently removed from the container within the press housing and connected to the binder line in the press housing.

[0028] As already explained, it is possible that the atomizing nozzle is detachably arranged in the press housing. In this case, the atomizing nozzle and, if necessary, the nozzle carrier holding the atomizing nozzle have to be brought into the interior of the press housing before the pre-cleaning according to the application and assembled there. Especially in a closed rotary press, this should be done without opening the press housing and without the associated destruction of the tightness. For this purpose, the atomizing nozzle and, if necessary, the nozzle carrier have to be brought into the interior space of the press housing. Before the bringing in, the coarse dust can be sucked off from the press housing with the aid of a suction device, which is usually present in such a rotary press, for example a hand-operated suction device. In a next step, the atomizing nozzle and, if necessary, the nozzle carrier holding the atomizing nozzle are introduced into a container for protecting the atomizing nozzle or the nozzle carrier. Subsequently, the atomizing nozzle is brought into the press housing of the rotary press, if necessary together with the nozzle carrier in the container, i.e. through a preferably dust-tight delivery opening of the press housing, for example a quick transfer port. In this way, the bringing in under the condition of the tightness maintained in the rotary press is possible. In the press housing, the atomizing nozzle can be taken out of the container, if necessary together with the nozzle carrier, and mounted at the intended place and connected with the adhesive tank with the aid of the adhesive line. The taking out of the atomizing nozzle and, if necessary, the nozzle carrier from the press housing during the dismantling can be carried out correspondingly in the reverse manner. BRIEF DESCRIPTION OF DRAWINGS

[0029] An embodiment of the application is explained further below with the aid of the drawings. Therein is shown schematically:

[0030] Figure 1 A rotary press with the rotor in an unfolded view;

[0031] Figure 2 A schematic view of a rotary press according to the application;

[0032] Figure 3 A schematic partial cut view of an adhesive tank of a rotary press according to the application; and

[0033] Figure 4 A schematic view of a nozzle carrier of a rotary press according to the application comprising an atomizing nozzle arranged thereon. DETAILED DESCRIPTION

[0034] In the drawings, like reference numerals refer to like objects.

[0035] In Figure 1The rotary press shown in Fig. 1 is a rotary press for tablet manufacture as can be used in the present application and in which a material in powder form is pressed to tablets. The rotor of the rotary press is driven in rotation by a rotary drive and has a die disc 10 with a plurality of cavities 12. The cavities 12 can be formed, for example, by holes of the die disc 10. Further, the rotor has a plurality of upper and lower punch dies 14, 16 which rotate synchronously with the die disc 10. The upper punch dies 14 are guided axially in upper punch guides 18 and the lower punch dies 16 are guided axially in lower punch guides 20. The axial movement of the upper and lower punch dies 14, 16 during rotation of the rotor is controlled by upper and lower control cam elements 22, 24. A filling device 26 is furthermore provided, which has a filling reservoir 28 and a filling chamber 30 connected by a filling tube 32. In this way, in the present example, the powder material reaches from the filling reservoir 28 through the filling tube 32 into the filling chamber 30 by gravity and from there again by gravity through a filling opening provided on the lower side of the filling chamber 30 into the cavities 12 of the die disc 10.

[0036] The rotary press furthermore has a pressure device 34. The pressure device 34 has a pre-pressure device comprising an upper pre-pressure roller 36 held on an upper holder 35 and a lower pre-pressure roller 38 held on a lower holder 37 and a main pressure device comprising an upper pressure roller 40 held on an upper holder 39 and a lower pressure roller 42 held on a lower holder 41. Furthermore, the rotary press has an ejection device 44 and a scraping device 46 comprising scraping elements which transport tablets 48 manufactured in the rotary press to a discharge device 50 for leading out of the rotary press. The scraping device 46 can have, for example, preferably sickle-shaped scraping elements which scrape the tablets 48 transported by the lower punch dies 16 onto the upper side of the die disc 10 from the die disc 10 in the region of the ejection device 44 and transport them to the discharge device 50.

[0037] Furthermore, the rotary press has a control device 52 for controlling the operation of the rotary press and for carrying out the method according to the application, as will be explained further on.

[0038] In Figure 2 Fig. 2 a rotary press according to the application is shown, which has a press housing 54 in which, for example, a rotary press as shown in Fig. 1 is arranged. Figure 1The components including the rotor 56 are shown in. On the press housing 54, a binder tank 58 is provided, which can be connected dust-tightly to the interior space 60 of the press housing 54, for example, via a quick transfer port. The rotary press can be a closed rotary press, in which a negative pressure relative to the environment is produced in the interior space 60 of the press housing 54 by means of an extraction device, for example, provided in the press housing 54.

[0039] In the interior space 60 of the press housing 54, two nozzle carriages 62 are provided above the rotor 56 in the example shown, which each hold at least one atomizing nozzle, as explained in more detail next. By means of the atomizing nozzles, a spray mist 66 is released in the interior space 60 of the press housing 54 in the course of the operation of the rotary press. Figure 2 The nozzle carriages 62 and with them the atomizing nozzles are connected to the binder tank 58 by means of a binder line 64, which is shown very schematically in. In the course of the operation, by means of a delivery device, in particular a compressed air device, integrated into the binder tank 58, a liquid binder, in particular water, a decontaminant and / or a corrosion inhibitor, if necessary, can be added to the nozzle carriages 62 and with them the atomizing nozzles, so that by means of the atomizing nozzles, a spray mist 66 is released in the interior space 60 of the press housing 54. The process can be controlled automatically by means of the control device 52, in particular after the process has been initiated by an operator, for example, by means of an operating terminal of the rotary press. The released spray mist binds dust of the powder material being pressed in the rotary press, which is in the air in the interior space 60 of the press housing 54, and prevents dust particles from being suspended in the air and correspondingly being discharged into the environment upon opening of the press housing 54 and the health risks associated therewith for the operator.

[0040] In Figure 3 In, the binder tank 58 is shown in an enlarged and partially sectioned view. The binder tank has two binder-filled tank containers 68 in the example shown, which are connected to line connections 70 to which the binder line 64 is connected. Furthermore, a compressed air feed 72 of a delivery device is provided in the binder tank 58, by means of which compressed air for delivering the binder is delivered from the tank containers 68 to the line connections 70 and via the binder line to the atomizing nozzles. On the end side, the binder tank 58 has an interface 74 for docking onto the press housing 54 of the rotary press, in particular an interface 74 for connecting to a quick transfer port of the rotary press.

[0041] In Figure 4 In, one of the nozzle carriages 62 is shown exactly. The nozzle carriage has a deflection drive 76, to which a rod-shaped nozzle holder 78 is fastened, which is pivoted about a longitudinal axis in the course of the deflection drive 76, i.e. in the Figure 4The nozzle holder 78 is arranged in the press housing 54 in such a way that it can be rotated about a vertical line. In the example shown, two atomizing nozzles 80 are arranged in the nozzle holder 78, which are oriented at an angle to one another. On a further line connection 82, a binder line is connected, and the binder conveyed through the line connection 82 is conveyed to the atomizing nozzles 80 in operation, which release the binder in the form of a spray in the press housing, wherein the atomizing nozzles 80 are rotated during the spray release by the deflection drive 76 as explained. The deflection drive 76 can be controlled, for example, pneumatically. For this purpose, a pneumatic connection 84, in particular an air connection 84, is provided. The actuation of the conveying device and the deflection drive 76 can be carried out, as explained, by the control device 52, in particular after the start of the pre-cleaning process by the operator.

[0042] By releasing the spray according to the application, by the rotating atomizing nozzles 80, a fine and binder dust spray is distributed extensively and uniformly in the interior space 60 of the press housing 54, so that the dust is reliably bound and subsequently falls onto the surface of the rotor 56 or the press housing 54. The pre-cleaning process produced with the spray can be carried out by the control device 52 for a relatively short time interval of less than two minutes, further preferably less than one minute, in particular less than 30 seconds, so that only a relatively small amount of liquid is released into the interior space 60 of the press housing 54 and the risk of a larger amount of liquid accumulating on the surface of the rotary press is correspondingly minimized. The suction device of the rotary press for producing a negative pressure in the interior space 60 of the press housing 54 assists in the distribution of the spray in particular by a turbulent air flow.

[0043] The nozzle holder 62 together with the atomizing nozzles 80 can be arranged in the press housing 54 in a detachable manner. For the assembly or disassembly of the nozzle holder 62 together with the atomizing nozzles 80, the nozzle holder together with the atomizing nozzles can be placed into a transfer container and fed into or out of the press housing 54 by a quick transfer port, without having to destroy the tightness of the rotary press. Of course, for the assembly or disassembly, the line connections 82, 84 arranged on the nozzle holder 62 are separated from or connected to the corresponding lines.

[0044] List of reference signs

[0045] 10 mold plate

[0046] 12 mold cavity

[0047] 14 upper press die

[0048] 16 lower press die

[0049] 18 upper die guide

[0050] 20 lower die guide

[0051] 22 upper control curve element

[0052] 24 lower control curve element

[0053] 26 filling device

[0054] 28 filling reservoir

[0055] 30 filling chamber

[0056] 32 filling tube

[0057] 34 pressure device

[0058] 35 upper holding element

[0059] 36 upper pre-compression roller

[0060] 37 lower holding element

[0061] 38 lower pre-compression roller

[0062] 39 upper holding element

[0063] 40 upper compression roller

[0064] 41 lower holding element

[0065] 42 lower compression roller

[0066] 44 ejection device

[0067] 46 scraping device

[0068] 48 tablet

[0069] 50 discharge device

[0070] 52 control device

[0071] 54 press housing

[0072] 56 rotor

[0073] 58 binder tank

[0074] 60 interior space

[0075] 62 nozzle holder

[0076] 64 binder line

[0077] 66 spray

[0078] 68 tank container

[0079] 70 line connection

[0080] 72 compressed air feed

[0081] 74 interface

[0082] 76 deflection drive

[0083] 78 nozzle holder

[0084] 80 atomizing nozzle

[0085] 82 line connection

[0086] 84 line connection

Claims

1. Rotary press, comprising a press housing (54) and a rotor (56) arranged in the press housing (54), wherein The rotor (56) has upper and lower punch guide devices (18, 20) for upper and lower press punches (14, 16) and a die plate (10) between the punch guide devices (18, 20), wherein the press punches (14, 16) cooperate with a receiving portion (12) of the die plate (10), further the rotary press comprises at least one filling device (26) in which material to be pressed is filled into the receiving portion (12), further the rotary press comprises at least one pressure device (34) which cooperates with the upper press punch (14) and the lower press punch (16) during operation, so that the upper press punch and the lower press punch press the material in the receiving portion (12) into a press cake, and the rotary press comprises an ejection device (44) for press cakes produced in the rotary press, characterized in that a binder tank (58) containing a liquid binder is arranged in the press housing (54) or outside the press housing (54), at least one atomizing nozzle (80) is arranged in the press housing (54), and between the binder tank (58) and the atomizing nozzle (80) a binder line (64) extends at least partially within the press housing (54), wherein a delivery device is arranged which delivers binder from the binder tank (58) through the binder line (64) to the atomizing nozzle (80) during operation, so that the atomizing nozzle (80) produces a spray (66) from the binder within the press housing (54) which binds dust in the press housing (54).

2. The rotary press of claim 1, wherein, A control device (52) is arranged which is designed to operate the delivery device for a time interval of less than 5 minutes, preferably less than 2 minutes, further preferably less than 1 minute, for delivering the binder from the binder tank (58) through the binder line (64) to the atomizing nozzle (80).

3. Rotary press according to one of the preceding claims, characterized in that The binder tank (58) is arranged on the outside of the press housing (54).

4. The rotary press of claim 3, wherein, The binder line (64) extends from the binder tank (58) through a dust-tight opening of the press housing (54) to the atomizing nozzle (80).

5. A rotary press according to one of claims 3 or 4, characterized in that The binder tank (58) is docked to the press housing (54) by means of a quick transfer port.

6. Rotary press according to one of the preceding claims, characterized in that The binder comprises water and / or a purifying agent and / or a preservative.

7. Rotary press according to one of the preceding claims, characterized in that The delivery device has a compressed air device which delivers the binder from the binder tank (58) to the atomizing nozzle (80) by means of compressed air.

8. Rotary press according to one of the preceding claims, characterized in that The atomizing nozzle (80) is arranged deflectably in the press housing (54), and a deflection drive (76) is arranged which deflects the atomizing nozzle (80) during production of the spray (66) in the press housing (54).

9. The rotary press of claim 8 wherein, The atomizing nozzle (80) is arranged on a nozzle holder (62), and the nozzle holder (62) has the deflection drive (76).

10. Rotary press according to one of claims 8 or 9, characterized in that The deflection drive (76) is a pneumatically driven deflection drive (76).

11. Rotary press according to one of the preceding claims, characterized in that The atomizing nozzle (80) is arranged in the press housing (54) above the rotor (56).

12. Rotary press according to one of the preceding claims, characterized in that The rotary press is a closed rotary press comprising an extraction device, wherein the extraction device generates a negative pressure in the press housing (54) relative to the environment of the press housing (54).

13. The rotary press of claim 12, wherein, A control device (52) is provided, which operates the extraction device during the generation of a spray (66) in the press housing (54) by means of the atomizing nozzle (80) such that the extraction device generates a negative pressure in the press housing (54) relative to the environment of the press housing (54), wherein the spray (66) is distributed in the press housing (54) by means of the flow of turbulence generated by means of the extraction device.

14. Rotary press according to one of the preceding claims, characterized in that The atomizing nozzle (80) is detachably arranged in the press housing (54).

15. Rotary press according to one of the preceding claims, characterized in that Furthermore, a manually operable spray gun is provided, with which an operator can spray an area within the press housing (54) with adhesive.

16. Method for pre-cleaning a press housing (54) of a rotary press according to one of claims 1 to 15, wherein With the atomizing nozzle (80), a spray is generated in the press housing (54) from the adhesive, which binds dust in the press housing (54).

17. The method of claim 16, wherein, After the end of the pre-cleaning, no adhesive flows out of the press housing (54).

18. The method according to one of claims 16 or 17, characterized in that, The conveying device is operated for a time interval of less than 5 minutes, preferably less than 2 minutes, further preferably less than 1 minute, for conveying the adhesive from the adhesive tank (58) to the atomizing nozzle (80) via the adhesive line (64).

19. Method for introducing an atomizing nozzle into a press housing (54) of a rotary press according to one of claims 1 to 15, wherein The atomizing nozzle (80) and, if necessary, the nozzle holder (62) holding the atomizing nozzle (80) are introduced into a container outside the press housing (54), wherein the container is subsequently introduced into the press housing (54) through a conveying opening of the press housing (54), and wherein the atomizing nozzle (80) and, if necessary, the nozzle holder (62) holding the atomizing nozzle (80) are subsequently removed from the container inside the press housing and connected to the adhesive line (64) in the press housing (54).

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