WO2019110284A1 - Track system - Google Patents

Abstract

The invention relates to a track system for individually movable transport movers, which can be moved along at least one track defined by the track system, comprising at least one track section that comprises a motor stator and comprises a carrier for the motor stator, the motor stator forming a linear motor together with the transport movers. The motor stator is accommodated in a motor housing and is attached to the carrier by means of the motor housing. At least one seal is arranged between sides of the motor housing and of the carrier that face each other.

Description

 Bahnsvstem

The invention relates to a web system for individually movable transport movers which are movable along at least one path predetermined by the web system, comprising at least one web section comprising a motor stator forming a linear motor together with the transport movers and a support for the motor stator. Such web systems are basically known, for example from DE 10 2014 106 400 A1 published on 12 November 2015.

A preferred drive for the transport movers in the web system, as it is preferably also provided for the invention described and claimed here, can each be designed as a linear motor, in particular as a linear synchronous motor or as a linear induction motor.

Such linear motors are basically known in connection with a large number of applications. Such a drive principle is advantageous, inter alia, when comparatively low loads are to be transported, as is the case in the area of transporting food portions in question here.

A transport system which can also be used in principle for the present invention and which is preferably provided, and which is hereby expressly referred to in view of the requirement for practicability of the invention, is offered by MagneMotion Inc., located in Devens, Massachusetts, USA. This system is based on a so-called LSM drive, ie on a powered by linear synchronous motors, which can be distinguished from a so-called linear induction motor (LIM drive). In contrast to a LIM drive, a magnetic field is not induced by the so-called electromagnetic traveling field in an LSM drive, but the magnetic field is provided by permanent magnets. If the rotor (transport movers) of the linear motor carries the permanent magnets and the stator of the linear motor generates the traveling electromagnetic field, then one can visualize the drive principle of an LSM drive in such a way that the transporter provided with the permanent magnet moves away from the is pulled along the stator moving magnetic field over the transport path. Such a transport system or drive principle is described, for example, in WO 2003/029651 A2 and WO 2010/085670 A1. These documents are hereby expressly incorporated by reference for the disclosure of a possible drive or operating principle for the invention.

The web system or the individual webs of such a transport system can be subdivided into a multiplicity of successive web elements or web sections, which to a certain extent each form a single linear motor and can be individually controlled by a control device. If, at the same time, the transport movers in the rail system can be identified by means of the control device, then in principle any number of transport engines can be operated simultaneously in a fundamentally arbitrarily complex rail system and thereby moved individually.

For the identification or localization of the individual transporters (transport movers) in the railway system, the aforementioned company MagneMotion Inc. uses a technique in which each transporter is provided with a transducer which induces a signal in the stator formed by the railway system, thereby producing a signal the control device is made possible, the exact position of the transporter with a dependent on the size of the overall system accuracy of fractions of a millimeter or fraction of a centimeter. An advantage of this system is that no external sensors are needed. In addition, in the case of the control system from MagneMotion Inc., the subdivision of the webs into a multiplicity of web elements-in some sense a single linear motor in each case-ensures that no collisions occur between successive transporters. Thus, a transporter can enter the next track element only if this is permitted by the control device, which is not the case in particular when another transporter is in the track element.

Against the background of this basically known transport system is provided in the invention that the web system is formed as a stator of the linear motor, i. each track section comprises a motor stator forming a linear motor or a part of a linear motor together with the transport motor. The transport movers each comprise a rotor of the linear motor, wherein in particular the rotor comprises at least one permanent magnet. As already mentioned above, the web system is preferably subdivided into a plurality of web sections, which in particular each represent a single linear motor, which can be individually controlled by a control device of the web system.

In known systems of this type, the motor stator is housed in a housing made of sheet metal, which is closed at the bottom by a lid. With a simple sealing material such as silicone, the butt area between the lid and the rest of the housing is hermetically sealed. The housing is fastened to a supporting structure by means of several stud bolts welded to the outer wall of the housing, for example, which makes it possible to set up the rail system in the desired working area and at the required height level. The hermetic housing seal provided in these known motor stators fulfills their purpose in many areas, but is not unproblematic, especially in the area of food machinery construction, above all because of the hygiene requirements there. In particular, the housings are subject to severe temperature fluctuations. Relatively low ambient temperatures prevail in a normal operating state in which the web system is located in a comparatively cool processing or cooling space. In contrast, the cleaning of the web system, which is carried out at regular intervals, typically takes place with hot water. In addition, there is a generation of heat due to the housed in the housing, the stator forming electrotechnical components, the amount of heat generated depending on eg the running time, the power output and the type of components used can be considerable.

Such temperature fluctuations can lead to a condensation of moisture inside the housing as well as to "pumping effects" if the sheet metal housing alternately expands and contracts due to the temperature fluctuations. It has been shown that such housing movements can lead to humid ambient air being drawn into the interior of the housing. Even very small amounts of moisture may affect the operation of the stator.

The cause of these problems was identified as the sealing material used. In particular, silicone is not up to the conditions prevailing in the food industry. In the food sector, the web systems in question here are often operated in practice in so-called clean rooms, which also requires frequent and intensive cleaning operations in view of the increasing quality requirements for the food products. The necessary cleaning operations are extreme in that aggressive cleaning agents can be used. In practice, not all because of application errors particularly harmful substances that do not comply with the prescribed cleaning agents are used. The required, relatively long residence or exposure times of the cleaning agents on the housings can also prove problematic. Mechanical cleaning measures and stresses caused by exposure to high-pressure fluids through the use of high-pressure cleaning devices also lead to a heavy load. In this context, it must be borne in mind that improperly trained or highly time-consuming cleaning personnel may tend to improperly carry out cleaning in terms of excessive loads.

Incorrect detergent can attack the sealant used in each case, such as silicone, between the housing and the lid. Furthermore, so-called micro-leaks are to be feared, via which liquids can get into the housing interior and, for example, can lead to corrosion on the components of the motor stator.

In addition, a heat development within the housing can lead to a certain pressurization and thus to a slight swelling of the housing, which may eventually lead to a detachment of the sealant from the surfaces of the housing parts in the course of time.

Against this background, it is an object of the invention to provide a web system of the type mentioned in the introduction, in which the interior of the motor housing is protected from harmful external influences even under extreme conditions, such as occur in the food sector described above. In particular, the motor housing should be able to withstand even severe temperature fluctuations and treatments with high-pressure cleaning fluids and in some cases aggressive cleaning agents. so that it is ensured that moisture or other media can not get into the interior of the housing.

The solution of this object is achieved by the features of the independent claims.

According to one aspect of the invention, it is provided that the motor stator is accommodated in a motor housing and attached to the carrier via the motor housing, wherein at least one seal is arranged between mutually facing sides of the motor housing and the carrier.

Although the motor housing is closed in accordance with the invention, it does not need to be sealed as before, since the motor housing is sealed only by the interaction with the carrier. The seal is consequently not effective between surfaces of the housing itself, as hitherto, but between the housing and the carrier. The invention has recognized that the problems with the sealing material used hitherto are primarily attributable to the fact that only the surfaces of the housing parts which have not been specially pretreated are used as contact or contact surfaces for the sealing material. In the case of adverse external influences, these sealing surfaces can actually become impervious, for example due to a partial detachment of the sealing material from the housing surfaces.

As a result of the invention, the seal is to some extent outsourced, so that not only surfaces of the housing parts cooperate with a sealing material, but hitherto not usable for sealing areas of at least one housing part can be used. These are, in particular, edges or edge regions which have the advantage of penetrating or dipping into deformable material of a gasket, in particular linearly so as to produce a much better and, above all, longer-lasting sealing effect. kung as in a merely surface contact to achieve. The third component in addition to the housing and the seal is not belonging to the housing carrier, ie the invention draws to seal the housing in addition to a seal a further component zoom, which is not part of the housing, but in itself relatively solid and exactly can be made.

The invention also has the advantage that the motor housing itself does not have to be sealed at all. The motor stator can therefore be produced more cheaply and purchased as a purchased part by a system manufacturer cheaper because the manufacturer of the motor stator no longer needs to guarantee the tightness of the housing. The manufacturer of the web system, which represents a customized end product, can modify the motor stator if required. He does not need to rely on the tightness of the motor housing, but has the assembly of the motor housing and the carrier and thus the sealing of the motor housing itself under control.

The carrier can be mounted on a substructure designed, for example, as a frame or itself form at least a part of the substructure. The linear motor and the substructure can consequently come from a single source in a coordinated manner.

If the motor housing itself is not hermetically sealed, access to the housing interior is easier for both the manufacturer and the operator of the railway system, for example, to access and control the motor stator directly for maintenance purposes.

The inventive combination of a carrier and a motor housing, which only together provide a seal of the motor housing, also allows a simpler, in particular standardizable structure, preferably in modular design. Another advantage of the sealing concept according to the invention is that the seal varies in a simple manner and can be adapted to the respective conditions.

It has been found that the sealing concept according to the invention can meet the high hygiene requirements in the field of food-processing machinery.

Although in principle different orientations of the railway system in the room are possible, the carrier is arranged below the motor housing in a typical construction, which is particularly relevant in practice. Consequently, the carrier can be formed such that even below the housing a relatively well protected, in particular exclusively downwardly open, region is present, in which connection lines and other electrotechnical components can be accommodated. For this purpose, the carrier can be provided with downwardly extending side skirts, as described in detail elsewhere. Side skirts of this kind ensure, in particular, good spray water protection and, in addition, can dissipate any falling product residues or transported objects.

Advantageous embodiments of the invention are also specified in the dependent claims, the description and the drawing.

Preferably, the housing and the carrier are clamped together with the interposition of the seal. Since the carrier does not belong to the housing, such a tension can be realized simply and effectively.

In a preferred embodiment, the motor housing rests against the gasket with a line-shaped area, in particular with an edge or with a fold. As a result, a high sealing effect can be achieved. As also mentioned above, according to the invention it is not necessary that the motor housing itself be sealed. In particular, the housing is open on one side and preferably on its underside.

In a preferred embodiment, the motor housing is formed in several parts, wherein at least one intermediate space between at least two housing parts of the motor housing is sealed by the seal.

Preferably, the motor housing comprises at least two housing parts, wherein an inner housing part inserted with its open side ahead in an outer housing part and the outer housing part with its open side facing the carrier, wherein between a support facing the bottom of the inner housing part and at least one Side wall of the outer housing part to the carrier out, in particular down, open gap is present, which is sealed by the seal.

The housing parts preferably have an at least approximately U-shaped cross-sectional shape in a plane extending perpendicularly to the path predetermined by the web section.

The track section can be a straight track section or a curved track section, in particular a curve piece comprising, for example, 45 ° or 90 °. In a straight-line track section, the motor housing preferably has a substantially cuboid basic shape.

The two housing parts may each be cup-shaped. This does not preclude, for example, that the side parts in the region of their free ends angled inwards or outwards once or several times, folded down, turned off folded, folded or bent over. As a result, the stability can be increased or fastening areas can be provided, in particular for attaching the motor housing to the carrier.

In a preferred embodiment, it is provided that the seal is arranged in an edge region of the motor housing and, in particular, is formed circumferentially along an edge region of the motor housing.

Preferably, the seal is at least substantially in a plane.

The seal may comprise exactly one or more contiguous closed ring areas.

For example, when the motor housing has on the side facing the carrier one or more connections for supply, signal or control lines and the carrier is provided on its side facing the motor housing with corresponding openings or openings, it can be provided that the Seal extends around one or more such openings or openings.

According to a further embodiment, it is provided that the seal is designed as a housing surrounding the motor housing, at least on the outside, for the motor housing.

The seal can surround the front side of a side wall or a free end of a side wall of a housing part facing the carrier with its open side inside and / or outside.

The carrier may have a flat surface for the seal. However, this is not mandatory. In an alternative embodiment, the carrier and the Have seal corresponding, non-planar profiles. These design possibilities also exist for the side of the motor housing facing the carrier.

The seal may be fixed to the motor housing or to the carrier. In particular, pre-assembly of the seal on the motor housing or on the carrier can take place.

The connection between the seal and the motor housing or between the seal and the carrier can be, for example, cohesive or positive. In particular, it can be provided that the seal is vulcanized onto a corresponding surface of the motor housing or of the carrier. A pretreatment of the surface which requires a certain amount of effort for this purpose can, in principle, also be included in the flaring process of the motor housing. An advantage of the invention, however, is that this is not necessary, as can be used for the prefixing of the seal not belonging to the housing and ferti supply technology comparatively easy to handle carrier.

Alternatively, the seal may be attached to the housing or to the carrier.

In a further embodiment, the carrier and the motor housing are interconnected by a plurality of local fasteners. In particular, the carrier and motor housing can be screwed together.

The fastening elements preferably extend through the mutually facing sides of the motor housing and the carrier as well as through the seal. In a preferred embodiment, such fastening elements are used to improve the sealing effect. For this purpose, it can be provided that the seal is in each case pretensioned by the fastening elements in contact with the motor housing, in particular in contact with housing surfaces directed outward. In this case, it can be utilized that, when the motor housing and carrier are braced, the seal is compressed and the evasive material of the seal is pressed against corresponding sealing surfaces of the motor housing or the carrier, whereby the sealing effect is further improved.

At least in the area of the fastening elements, a distance section defining the distance between the motor housing and the carrier can be provided in each case. This ensures defined conditions with regard to a compression of the seal between the motor housing and the carrier. The spacer elements can each be provided as separate spacers. In principle, it is alternatively possible to use a particular elongate spacer element, which also extends between the fastening elements.

Furthermore, in each case at least in the region of the fastening elements, a stop section can be provided, which defines the distance between the side wall of a housing part facing the carrier with its open side and the fastening element in an end region of the side wall. Preferably, the frontal region of the side wall is clamped in each case between the stopper section and a protruding edge section of the seal.

By such a stop portion, a deflection of a side wall can be prevented and consequently the sealing effect can be further improved.

One way to influence the sealing effect is to select a suitable material for the seal. In particular, due to the elastic eigen- shafts of the seal, in particular in the region of a protruding edge section, which is preferably in the manner of an inner or outer enclosure for the motor housing or an outer housing part, are influenced by the manner in which the seal bears against the relevant section of the housing invests.

As a material for the seal can be used in principle any conventional sealing material. Preferably, the seal is made of an elastically deformable material, in particular an elastomer.

The motor housing may be attached to an at least substantially tabular support section of the carrier. Preferably, this support portion is provided with one or more openings. Consequently, the support section itself does not need to provide a continuous closed surface, since the sealing of the housing takes place through the seal. The support section only needs to provide a sufficient contact surface for the seal.

The support section may have a strip shape following the course of the motor housing. The strip may be straight or curved according to the course of the motor housing. Preferably, the width of the strip corresponds at least substantially to the width of the side of the motor housing facing the carrier. Alternatively it can be provided that the strip slightly protrudes on both sides of the motor housing or at least on one side of the housing.

A function which goes beyond the sealing and attachment of the motor housing can be fulfilled by the carrier if, according to a further embodiment, a support section of the carrier to which the motor housing is attached, on at least one longitudinal side into, away from the motor housing, in particular obliquely or vertically down, extending side skirt passes. As already mentioned in the introductory part, a further area protected by the carrier against external influences can thereby be created, in which, for example, lines or additional electrotechnical components of the railway system can be accommodated. The side apron of the wearer not only protects this area, for example, from being splashed, for example, during cleaning, but also provides a permanently present privacy screen, which can also prevent persons or objects from coming into contact with the devices arranged in the protected area.

The or each side skirt may be provided with at least one edge or fold extending in particular in the longitudinal direction, ie parallel to the path predetermined by the web section. This increases the stability of the wearer. The side skirt can be angled or folded several times. Thus, for example, an obliquely downwardly extending section adjoining the support section, which provides a drainage surface for contaminants and cleaning water and merges at its free end in a further, at least substantially vertical wall portion, so that within the carrier comparatively much space for the Accommodation of cables and other components is provided.

Furthermore, it can be provided according to the invention that the carrier is designed as an open cover on the side facing away from the motor housing, in particular downwards. Preferably, the cover is formed as a hood extending along the path predetermined by the web section. The hood can be open at least on one of its front sides.

The carrier may have an at least approximately U-shaped, V-shaped or trapezoidal cross-sectional shape in a plane perpendicular to the path predetermined by the web portion. A further aspect of the invention relates to a web system for individually movable transport movers, which are movable along at least one path predetermined by the web system, with at least one web section which comprises a motor stator forming a linear motor together with the transport movers. which is housed in a motor housing. The motor housing has at least one inlet and at least one outlet for a flushing medium, in particular air, wherein at least one flow path for the flushing medium is present between the inlet and the outlet within the motor housing.

In operation, a source of purge medium may be connected to the inlet of the motor housing to purge and / or dry the interior of the motor housing.

In this way, the emergence of disadvantageous condensates can be prevented within the motor housing. In particular, condensation water formed within the housing can be removed by means of the purging air. Furthermore, by means of the purging air, the housing interior can be tempered in a desired manner and, in particular, cooled.

The rail system may comprise a plurality of motor housings, in each of which one or more motor stators are accommodated, wherein at least some motor housings or individual groups of directly successive motor housings are each connected in the sense of a parallel connection directly to the source of flushing medium.

Furthermore, it can be provided that the web system comprises a plurality of motor housings, in each of which one or more motor stators are accommodated, wherein in at least one group of successive motor housings in the sense of a series connection, the motor housings are fluidically connected to one another and can be flowed through successively with the flushing medium. A combination of these concepts is possible. For example, a plurality of motor housings can each be connected in series and these groups can each be connected in parallel. In particular, but not exclusively, in the case of parallel connection, it is preferably provided that a membrane or a filter is integrated into the flow path on at least one or preferably each motor housing, in particular in the region of the outlet. A possibly excessively high moisture content of the purge air on one motor housing can thus not adversely affect other motor housings. Furthermore, this ensures that, in the event of a fault in the flow path in a motor housing, only this motor housing is affected and, moreover, the fault can be located very easily via the air supply system. Preferably, a closed circuit is provided for the flushing medium. Devices for dehumidifying the flushing medium can be integrated into the circuit.

Furthermore, a monitoring device for the flushing medium, which is designed to monitor the moisture content or another predetermined property of the flushing medium, may be provided on at least one or preferably each motor housing or at another point of a flushing medium circuit. A permanent flushing of the motor housing can be omitted if a flushing process is triggered only as a function of a signal of the monitoring device via an integrated or central control device as soon as a given condition is met. A further aspect of the invention relates to a web system for individually movable transport movers, which are movable along at least one path predetermined by the web system, having at least one web section which together with the transport movers comprises a motor stator forming a linear motor which is accommodated in a motor housing wherein the motor housing has at least one connection for a pressure medium, in particular air, wherein in operation the motor housing is connected via the connection to a source of pressure medium in order to generate an overpressure in the interior of the motor housing relative to the environment.

Due to the overpressure within the housing can be ruled out that media from the outside penetrate into the housing. Overpressure generation does not have to be permanent during operation. Thus, it is possible for the overpressure to be generated only temporarily, in particular in given operating situations or operating phases, for example during cleaning or when starting up the rail system or the entire system in which the rail system is integrated.

When this aspect of the invention is combined with the first aspect of the invention, that is, the concept of sealing between facing sides of the motor housing and a support for the motor housing, then the geometry of the seal can accommodate the possibility of overpressure generation within the engine Housing to be customized. Furthermore, a stop device can be provided outside of the motor housing, which ensures that in the case of overpressure generation, the relevant side wall is not excessively moved or bulging.

The invention also relates to a device for moving products, in particular portions, each comprising at least one disc separated from a food product, with a plurality of individually movable ones A transportation movers for at least one product, comprising a railway system according to at least one aspect of the invention for the transport movers, and a control device for controlling the movements of the transport movers in the railway system. The separation of the slices from the food products takes place in particular by means of an automatically operating slicing device, in particular by means of a high-speed slicer.

The invention also relates to a method for operating a web system for individually movable transport movers which are movable along at least one path predetermined by the web system, wherein the web system has at least one web section which comprises a motor stator forming a linear motor together with the transport movers housed in a motor housing. In one aspect, the method includes passing a purge medium through the interior of the motor housing.

It can be provided that the rinsing agent is only temporarily conducted through the motor housing, preferably as a function of monitoring of the rinsing medium, in particular with regard to the moisture content.

According to an additional or alternative, fundamentally independent aspect, the method comprises generating an overpressure in the interior of the motor housing relative to the surroundings.

Preferably, the overpressure is generated only temporarily, in particular in given operating situations or operating phases. All aspects of the invention, in particular the sealing concept, the flushing with a flushing medium and the overpressure generation, can be combined as desired.

The invention will now be described by way of example with reference to the drawings. Show it:

1 to 3 different partial views of a railway system according to the invention,

4 shows an exemplary embodiment of a web section according to the invention,

5 shows the carrier of the web section of FIG. 4, FIG.

Fig. 6 is a section through the web portion of Fig. 4, and

7 shows an enlarged detail of FIG. 6.

According to FIGS. 1 to 3, the web system according to the invention comprises a plurality of web sections 13, which can be individually joined to one another to form the desired web path for a particular application. 1 shows by way of example two successive rectilinear track sections 13. FIGS. 2 and 3 show a curve region with two rectilinear track sections 13 running at right angles to one another, between which a 90 ° cam section 13 is arranged.

Each track section 13 comprises a support 17 serving as a substructure, on which a motor housing is mounted, of which only an outer housing part 21 is shown, and in which a motor stator is housed, which is connected to Together with along the railway to moving transport movers 11 forms a linear motor. On the drive concept of Transportmover 11 will not be discussed here. In this regard, reference is made to the introductory part. 1 shows by way of example a transport movers 11 with two product carriers 35 arranged next to one another and designed to receive products to be transported, which are, for example, portions which contain one or more of a food product such as sausage or ham , Meat or cheese by means of a Flochleistungsslicers separated slices.

The guide of the transport movers 11 to the web sections 13 by means of parallel guide rails 37 which are mounted on the upper side of the outer housing part 21.

The support of the railway system on the ground is carried out by spaced-apart feet 33, which together with the carriers 17, which are fixed to the feet 33, form a base for the track sections 13. In the case of a rectilinear track section, the carrier 17 is an elongate hood which is open at the bottom and at the end (FIG. 5), which is formed by a multi-angled stainless steel sheet. Alternatively, the carrier 17 may be made of plastic with fundamentally the same shape. Two side skirts 17b are interconnected by a strip-shaped support portion 17a, which is provided with openings 41. The side skirts 17b each comprise a comparatively narrow strip extending from the support section 17a, which extends obliquely downwards and merges into a wider, approximately vertically downward-running wall. At its top, the support portion 17a is provided at its outer edge region with a circumferential seal 23. Further encircling seals 23 are located at the openings 41. The seals 23 are permanently connected to the support section 17a, for example, by scorching. Al ternatively, the seal 23 may be plugged.

Fig. 4 it can be seen that the width of the support portion 17 a of the width of the underside of the motor housing 21 corresponds.

4, the seal 23 is located between the bottom of the motor housing 21 and the top of the carrier 17, so the support portion 17 a. The positions of the openings 41 of the support portion 17a correspond to terminals on the underside of the motor housing 21 for the power supply and for signal and control lines.

The attachment of the motor housing 21 on the carrier 17 and the interaction of the motor housing 21, carrier 17 and seal 23 are shown in FIGS. 6 and 7.

The motor housing is formed by two elongated, each half-shell or channel-shaped, open to a side housing parts, namely an inner housing part 19 and an outer housing part 21. The outer housing part 21 is with its open side of the support portion 17 a of Carrier 17 faces, whereas the inner housing part 19 is inserted with its open side ahead in the outer housing part 21. The side walls of the two housing parts 19, 21 thus run parallel to one another and in each case perpendicular to the support section 17a.

Inside the housing 19, 21 are electrical components that form a motor stator 15, for example, a linear synchronous motor or a linear induction motor. The transport movers 11, which are shown in FIG. 6 as the mo- Torstator 15 are indicated only by dashed lines, each comprising a provided with one or more permanent magnets rotor 12, which cooperates with the motor stator 15 of the railway system to be moved by appropriate control of the motor stator 15 along the railway line. In this case, the transport movers 11 are guided in a captive manner by guide rails 37 fastened to the upper side of the outer housing part 21.

The supports 17 can each be fastened by means of bolts 39, which are welded to the underside of the support section 17a, on the feet (FIGS. 1 to 3) not shown in FIG. Such a bolt 39 is also shown in Fig. 5.

The arrangement of the outer circumferential seal 23 between the underside of the housing 19, 21 and the top of the support portion 17 a in the region of one of the two side walls 21 a of the outer housing part 21 and in the region of a fastening screw 27 is shown in FIG.

The fastening screws 27 serve to fasten the housing 19, 21 to the carrier 17. A head 28 of each screw rests against the underside of the support portion 17a with the threaded bolt of the screw 27 extending through an inwardly angled portion of the side wall of the inner housing portion 19 and one within the housing in the region of the floor the outer housing part 21 arranged threaded block 43 is screwed. As a result, the outer housing part 21 is pulled in the direction of the support portion 17 a of the carrier 17. Although an additional attachment of the inner housing part 19 on the outer housing part 21 or on the carrier 17 is in principle possible, but not required due to the screw connection between the carrier 17 and the outer housing part 21.

As shown in Fig. 7, the top of the support portion 17a of the carrier 17 is made flat. The corresponding surface of the seal 23 is therefore also in this level. As already mentioned, a permanent connection between the seal 23 and the support section 17a may be produced, for example, by vulcanization. By contrast, the opposite side of the seal 23 is provided with a stepped sealing profile corresponding to the housing profile. A circumferential raised outer abutment portion 23a of the seal 23 forms an enclosure for the outer housing part 21 and thus for the motor housing as a whole. On an inwardly subsequent step of the seal 23 pushes once folded by 180 ° free end of the side wall 21 a of the outer housing part. It can be seen in FIG. 6 that the material of the seal 23 is pressed in by the side wall 21 a.

Between this free end of the side wall 21 a and a spacer 29 through which the fastening screw 27 extends therethrough, there is a stopper portion 31, which acts as a lateral spacer element and ensures that when tightened fastening screw 27 of the increased investment section 23a of Seal 23 and the side wall 21 a of the housing 21 are pressed against each other. In this way, by means of the fastening screws 27, the seal 23 can be biased into abutment against the outer surface of the housing part 21. The sealing effect can be considerably increased by this effect.

The distance between the seal 23 and the bottom 19a of the inner housing part 19 defining spacer 29 and the lateral abutment portion 31 may also be integrally formed with each other.

Instead of the discrete spacer elements 29 in the region of the fastening screws 27 and strip-shaped spacer elements 29 can also be provided which extend over the entire length of the track section 13 between the housing 19, 21 and the carrier 17.

It is possible, but not necessary, to provide an additional sealing or filling material in this intermediate space 25. Rather, the invention enables the use of unsealed, downwardly open motor housings 19, 21 even in environments in which the motor housing 19, 21 is exposed to high temperature fluctuations and external influences due to moisture and potentially aggressive media, since the seal of the housing 19, 21 takes place by the interaction of carrier 17 and housing 19, 21 with the interposition of the compressed and deformed by the Schraubverspannung seal 23.

The carrier 17 can be made of a stainless steel sheet or of plastic. Consequently, the carrier 17 is a multifunctional part that is simple and extremely inexpensive to manufacture, which serves as a substructure for the motor housing 19, 21, seals the motor housing 19, 21, and also with its side skirts 17 b a protected area underneath the motor housing 19, 21 for others Provides components.

Further measures for protecting the interior of the motor housing 19, 21 are not shown in FIGS. 1 to 7 and relate in particular to the passage of scavenging air through the housing 19, 21 or the generation of excess pressure within the housing 19, 21. On the corresponding embodiments in the introductory part is referenced. LIST OF REFERENCES

1 1 Transport movers

 12 runners

 13 track section

 15 motor stator

 17 carriers

 17a carrying section

 17b side skirt

 19 inner housing part

 19a floor

 21 outer housing part

21 a side wall

 23 seal

 23a investment section

 25 space

 27 fastener

28 screw head

29 distance section

31 stop section

33 base

35 product carrier

37 guide rail

39 bolts

41 opening

43 threaded block

Claims

 Claims 1. A railway system for individually movable transport movers (11) which are movable along at least one path predetermined by the railway system,  comprising at least one track section (13) comprising a motor stator (15) forming a linear motor together with the transport movers (11) and a carrier (17) for the motor stator (15),  wherein the motor stator (15) housed in a motor housing (19, 21) and on the motor housing (19, 21) on the support (17) is mounted, and  wherein between mutually facing sides of the motor housing (19, 21) and the carrier (17) at least one seal (23) is arranged. 2. Railway system according to claim 1,  wherein the motor housing (19, 21) and the carrier (17) with the interposition of the seal (23) are clamped together, and / or  wherein the motor housing (19, 21) with a line-shaped area, in particular with an edge or with a rebate, rests against the seal. 3. Railway system according to claim 1 or 2,  wherein the motor housing (19, 21) is designed in several parts and at least one between at least two housing parts (19, 21) by the seal (23). 21) of the motor housing existing gap (25) is sealed, and / or wherein the motor housing comprises at least two housing parts (19, 21), wherein an inner housing part (19) with an open side in front of an outer housing part (21) inserted and the outer housing part (21) with its open side facing the carrier (17), wherein between a the carrier (17 ) facing the bottom (19a) of the inner housing part (19) and at least one side wall (21a) of the outer housing part (21) to the support (17) towards, in particular down, open space (25) is provided by the seal ( 23) is sealed. 4. Railway system according to claim 2 or 3,  wherein the housing parts (19, 21) each have an at least approximately U-shaped cross-sectional shape in a plane extending perpendicularly to the path predetermined by the web section (13). 5. Railway system according to one of the preceding claims,  wherein the seal (23) in an edge region of the motor housing (19, 21) and in particular along an edge region of the motor housing (19, 21) is formed circumferentially. 6. Railway system according to one of the preceding claims,  wherein the seal (23) is designed as a housing for the motor housing (19, 21) surrounding the motor housing (19, 21) at least externally. 7. Railway system according to one of the preceding claims,  wherein the seal (23) on the motor housing (19, 21) or on the carrier (17) is fixed, in particular by a cohesive or positive connection. 8. Railway system according to one of the preceding claims, wherein the carrier (17) and the motor housing (19, 21) by a plurality of local fastening elements (27), in particular connecting The fastening elements (27) preferably extend through the mutually facing sides of the motor housing (19, 21) and the carrier (17) and through the seal (23). 9. Railway system according to claim 8,  wherein the seal (23) is biased in each case by the fastening elements (27) in abutment with the motor housing (19, 21), in particular in abutment against outwardly directed housing surfaces. 10. Railway system according to claim 8 or 9,  wherein at least in the region of the fastening elements (27) in each case a distance between the motor housing (19, 21) and carrier (17) defining dance- dance section (29) is provided. 11. Railway system according to one of claims 8 to 10,  wherein in each case a stop section (31) is provided at least in the region of the fastening elements (27), which separates the distance between a side wall (21a) of a housing part (21) facing the carrier (17) with its open side and the fastening element (27). 27) in an end region of the side wall (21 a) defines, wherein preferably the end-side region of the side wall (21 a) in each case between the stopper portion (31) and a projecting abutment portion (23 a) of the seal (23) is clamped. 12. Railway system according to one of the preceding claims, wherein the motor housing (19, 21) is mounted on a support portion (17a) of the carrier (17) which extends on at least one longitudinal side in a direction away from the motor housing (19, 21), in particular obliquely or vertically downwards Side skirt (17b) passes. 13. Railway system according to one of the preceding claims, wherein the carrier (17) as a on the side facing away from the motor housing (19, 21) side, in particular down, open cover is formed, wherein preferably the cover as a along along the web section predetermined path extending, preferably frontally open, ne hood is formed. 14. A web system for individually movable transport movers (11), which are movable along at least one path predetermined by the web system,  with at least one track section (13) which comprises a motor stator (15) which forms a linear motor together with the transport movers (11) and which is accommodated in a motor housing (19, 21),  wherein the motor housing (19, 21) has at least one inlet and at least one outlet for a flushing medium, in particular air, and at least one flow path for the flushing medium is present within the motor housing (19, 21) between the inlet and the outlet, wherein in operation at the inlet of the motor housing (19, 21) a source of flushing medium is connected to flush the interior of the motor housing (19, 21) and / or to dry. 15. Railway system according to claim 14, wherein the railway system comprises a plurality of motor housings (19, 21), in each of which one or more motor stators (15) are accommodated, wherein at least some motor housings (19, 21) or individual groups of directly successive motor housings (19, 21 ) are each connected in the sense of a parallel connection directly to the source of flushing medium. 16. Railway system according to claim 14 or 15,  the railway system comprising a plurality of motor housings (19, 21) in each of which one or more motor stators (15) are accommodated, wherein in at least one group of successive motor housings (19, 21) in the sense of a series connection, the motor housing (19, 21) fluidly connected to each other and can be flowed through successively with the flushing medium. 17. Railway system according to one of claims 14 to 16,  wherein on at least one or preferably each motor housing (19, 21), in particular in the region of the outlet, in the flow path a membrane or a filter is integrated. 18. Railway system according to one of claims 14 to 17,  wherein a closed circuit is provided for the flushing medium, wherein preferably in the circuit, a device for dehumidifying the flushing medium is integrated. 19. Railway system according to one of claims 14 to 18,  wherein a monitoring device for the flushing medium is provided on at least one or preferably each motor housing (19, 21) or at another point of a flushing medium circuit, which is designed to monitor the moisture content or another predetermined property of the flushing medium. 20. A rail system for individually movable transport movers (11), which are movable along at least one path predetermined by the railway system, with at least one track section (13) which surrounds a motor stator (15) forming a linear motor together with the transport movers (11). which is housed in a motor housing (19, 21), wherein the motor housing (19, 21) at least one connection for a pressure medium, in particular air, having, during operation, the motor housing (19, 21) via the connection to a source of the pressure medium is connected in order to generate an overpressure in the interior of the motor housing (19, 21) relative to the surroundings. 21. device for moving products,  in particular of portions which in each case comprise at least one slice separated from a food product, in particular by means of a slicing device, in particular a high-speed slicer,  with a plurality of individually movable transport movers (11) for at least one product each,  with a railway system according to one of the preceding claims for the transport movers (11), and  with a control device for controlling the movements of the transport mover (11) in the railway system. 22. Method for operating a web system for individually movable transport movers (11) which are movable along at least one path predetermined by the web system, the web system having at least one web section (13) which, together with the transport movers (11 ) comprises a motor stator (15) forming a linear motor and housed in a motor housing (19, 21), the method comprising passing a purge medium through the interior of the motor housing (19, 21). 23. The method according to claim 22,  wherein the flushing medium is only temporarily through the motor housing (19, 21), preferably in dependence on a monitoring of the flushing medium, in particular with regard to the moisture content. 24. A method for operating a web system for individually movable transport movers (11) which are movable along at least one path predetermined by the web system, wherein the web system has at least one web section (13) which, together with the transport movers (11 ) comprises a motor stator (15) forming a linear motor and housed in a motor housing (19, 21),  the method comprising generating an overpressure in the interior of the motor housing (19, 21) relative to the surroundings. 25. The method according to claim 24,  wherein the overpressure is generated only temporarily, in particular in given operating situations or operating phases.