DE102014106298A1 - Roller grinder for grinding doughy pasty food masses - Google Patents

Abstract

The invention relates to a roller grinder (1) for grinding a paste-like pasty food mass, with a plurality of parallel aligned, behind and / or one above the other in a machine frame (6) arranged rollers (2) by means of at least one drive means each about a roll axis ( 5) are rotatably driven, so that the food mass to be ground in the form of a coherent product film by at least one between two adjacent rollers (2) located nip (12) can be conveyed, whereby a milling of the food mass takes place, each roller (2) at opposite end portions (14) each having a bearing portion (15) in which it is mounted within a perpendicular to the associated roll axis (5) relative to the machine frame (6) displaceable bearing housing (20), wherein a cavity (4) of each roller (2) by means of a feed device (27) a cooling liquid can be fed, which at a front end ( 30) from the roller (2) into an interior (24) of the bearing housing (20) and leaves the bearing housing (20) through an outlet opening (31), wherein in the interior (24) of the bearing housing (20) has a seal (32 ), with which a passage of the cooling liquid in the bearing region (8) of the bearing housing (20) can be prevented, and wherein the seal (32) at least one with the roller (2) rotating part (35) and at least one with the bearing housing (20) connected, with respect to the roller (2) stationary part (33, 34). In order to further develop the roller-type friction machine (1) such that no cooling liquid can pass from the interior (24) of the bearing housing (20) into the bearing area (8) and the adjoining product area (10), so that the wear of the bearing (19) is reduced and Contamination of the food mass is prevented, it is proposed that between at least one rotating part (35) and at least one stationary part (33, 34), a gap region (46, 47) of a pressurized fluid in a direction on the front end ( 30) of the roller (2) to flow through.

Description

introduction

The invention relates to a roller grinder for grinding a doughy pasty food mass, with a plurality of parallel aligned, behind and / or one above the other in a machine frame arranged rollers which are rotatably driven by means of at least one drive means each about a roll axis, so that the food mass to be ground in Form of a coherent product film is conveyed by at least one nip between two adjacent rolls nip, thereby grinding the food mass takes place, each roller at opposite end portions each having a bearing portion in which they are displaceable within a perpendicular to the associated roll axis relative to the machine frame bearing housing is stored, wherein a cavity of each roller by means of a feed means, a cooling liquid can be fed, which at an end face of the roller in an interior of the bearing housing overrun un d leaves the bearing housing through an outlet opening, wherein in the interior of the bearing housing, a seal is arranged with the passage of the cooling liquid in the bearing area of the bearing housing can be prevented and, wherein the seal at least one rotating part with the roller and at least one with the bearing housing having connected, with respect to the roller stationary part.

State of the art

A first step in the production process of chocolate deals with the grinding of pasty-dough food mass. By means of this process, solid constituents of the food mass (here: cocoa mass, sugar, cocoa butter, emulsifier, milk powder and various other components) are comminuted to such an extent that a grainy feeling during consumption of the chocolate should be prevented as far as possible. For this milling process, the aforementioned rolling mills or Walzenreibmaschinen (also called "refiner") are used. One frequently encountered embodiment of these roller grinders has five rollers, alternatively two-roller, three-roller and seven-high roller grinders are used.

The cylindrical or barrel-shaped rollers are arranged horizontally, wherein each pair of rollers forms a nip. The successive in the conveying direction of the food mass nips are from the nip through which the food mass is first transported and ground, up to the last nip ever smaller. Both fixed nip rolls and variable nip rolls are known, the variable nip depending on the speed of the roll and the roll pressure.

For the purposes of this application, the rollers of the roller grinder can be divided into a bearing section, a product section and a sealing section. The product section is typically cylindrical or slightly convex (crowned). This means that the diameter in the middle of the longitudinal axis of the cylinder is greater than in the edge regions. This allows a largely constant line pressure from the rollers to the mass to be processed. At the respective ends of the product section, following a step down to a reduced diameter, the bearing section follows. The sealing section follows at the end of this stepped bearing section. In the sealing portion, a seal is arranged, which separates a cooling liquid region of the bearing housing, in which cooling liquid is located, from a bearing region of the bearing housing.

Analogously, in the context of this application, the housing of the roller grinder can be divided into a product area, the storage area, the sealing area and a cooling liquid area, the product area and the storage area being separated from each other by a boundary wall. In the boundary wall is a hole through which the bearing portion of the roller is guided ("implementation"). The bearing portion of the roller is rotatably supported in the bearing area of the bearing housing of the roller grinder. The sealing portion of the roller extends through the sealing area of the bearing housing into the interior of the cooling fluid area, wherein the seal is located in the sealing area of the bearing housing. For the purposes of this application is further provided that the bearing sections and sealing portions of the rollers are each arranged in a separate bearing housing. To adapt the nip, the respective bearing housings are pivotally and / or displaceably mounted, so that two bearing housings can mutually change the position of the roller at two opposite end sections of the roller.

The resulting friction between the food mass and the rollers creates excess heat. Discharge of the excess heat is unavoidable, otherwise roll temperatures would rise to impermissible levels, which in turn would lead to premature wear or destruction of the rolls. In addition, the quality of the food mass can be adversely affected by too high temperatures.

With the help of a circulation of cooling liquid, the heat is usually dissipated successfully. For this purpose, the cooling liquid is introduced into the cavity of the roller via a feed device. The feeder typically includes a lance rotatably connected to the bearing housing, with the lance extending almost the entire length of the roller. The rotatably mounted roller rotates around the lance. Subsequently, the laden with the excess heat coolant is passed through the hollow bearing portion of the roller through the interior of the bearing housing further through an outlet opening of the Walzenreibmaschine and, if necessary, supplied to a cooling device or disposed of in a sewer system.

Due to the fact that the sealing portion of the roller is rotatably mounted, the sealing between the interior of the cooling liquid area and the storage area is a challenge. This seal must be designed such that a seal takes place in addition to the rotatable storage, which prevents the frequent germ-loaded cooling fluid not in the storage area, which can lead to premature wear of the bearing, and in particular can also get into the adjoining product area, which would result in contamination of the food mass. Due to the permanently above the room temperature lying coolant temperature and a load of the cooling liquid with Legionella is not rare.

However, today's Walzenreibmaschinen do not have seals, which absolutely prevent the coolant can reach the storage area and the subsequent product area. The use of a shaft seal, for example, does not allow a sufficient radial seal between the storage area and the interior. In addition, the wear of the shaft seal is so high that a constant maintenance of Walzenreibmaschine would be necessary.

An improvement in terms of maintenance requirements have brought so-called labyrinth seals, since the cooling liquid can not get into the storage area directly, without there being a touching contact of rotating components to each other. The labyrinth seal is problematic because it is not completely prevented that the food mass is contaminated with germs, because the interior is still connected via "twisted" detours to the storage area, whereby the germs of the coolant - albeit slower - get into the product area can.

There is still another open position in the cooling system, which is caused by the fact that the respective bearing housings are pivotably and / or displaceably mounted. That is, the outflow of the cooling liquid must also be stored in such a way that the displacement of the bearing housing is not affected. For this purpose, a pipe with a smaller diameter is usually passed into another pipe with a larger pipe. The difference between the two pipe diameters is so great that the pivoting and / or displacement is not hindered. However, this results in the presence of another open location in the cooling system through which germs may pass and enter the product area.

task

The present invention is based on the object of constructing a roller grinder so that no coolant can pass from the interior of the bearing housing into the storage area and the adjoining product area, so that wear of the bearing is reduced and contamination of the food mass is prevented.

solution

Based on a device of the type described above, the underlying object is achieved in that between at least one rotating part and at least one stationary part, a gap region is flowed through by a pressurized fluid in one direction to the front end of the roller.

The seal consisting of the at least one rotating part and at least one stationary part has, in connection with the forced flow opposite a potential "penetration direction", the advantage that the germ-loaded cooling fluid can not reach the bearing area of the bearing housing or the adjacent product area. Consequently, bacterial contamination of the food mass is counteracted and the quality of the food mass is significantly increased. A total failure of the Walzenreibmaschine due to contamination with germs can thus be safely avoided. In addition, an increased wear or premature failure of the bearing or the roller can be prevented and, accordingly, the distance between two maintenance cycles of Walzenreibmaschine can be extended and repair work are significantly less. On the whole, it is thus possible to increase the working life of the roller grinder and to increase the quantity and quality of the food mass produced.

The at least one rotating part of the seal is at the respective sealing portion of Roller arranged, that is on at least one of the two opposite end portions of the roller. This sealing section is preferably formed by an adapter (for example pressed) connected to the roller. The connection between the adapter and the roller is fluid-tight and designed such that the adapter rotates with the roller about the preferably horizontally oriented roller axis. The angular velocity of the adapter thus corresponds to the angular velocity with which the roll rotates. Alternatively, the sealing portion may also be an integral part of the bearing portion.

The at least one stationary part of the seal is in turn connected in the sealing region of the bearing housing with the latter, so that the at least one stationary part is stationary relative to the at least one rotating part. Between the at least one rotating part and the at least one stationary part is the gap region through which the pressurized fluid flows in the direction of the front end of the roller. The fluid flows from a pressure source into the bearing housing and is then pressed from the sealing area through the gap area into the cooling liquid area of the bearing housing formed by the interior, since there is a pressure gradient between the sealing area and the interior. This pressure gradient generates such a flow of the fluid into the interior, that the cooling liquid can not get into the gap region, but is blown away from it. Consequently, the cooling liquid can reach neither the sealing area nor in the adjacent storage area and product area, which in turn leads to the aforementioned advantages.

It should be noted at this point that the seal is preferably located at the front end of the roller on which the cooling liquid is fed into and out of the roller. Typically, the inlet opening and the outlet opening are located in the same bearing housing of the roller. However, it is also possible that the inlet opening and the outlet opening are arranged in two different, located at the opposite end portions of the roller bearing housings, so that the cooling liquid, for example, over two different end portions into the roller or out of the roller out. Consequently, then located in both opposite bearing housings such a seal.

Preferably, the cooling liquid is in a closed cooling system, so that at no point a transfer of germs from the cooling liquid on areas that come into contact with the food mass may occur. For this purpose, however, then the second open position, which is formed by the two tubes projecting into each other, must be closed. Advantageously, the two pipes protruding into one another are replaced by a hose, so that the bearing housings can continue to be displaced and / or pivoted in the machine frame.

In an embodiment according to the invention it is provided that the roll mill according to the invention comprises two stationary parts, each consisting of a partition which together axially surround the at least one rotating part located therebetween and preferably sealingly connect to the bearing housing. The first stationary part or the first partition wall is arranged between the sealing area and the storage area, whereas the second stationary part or the second partition wall separates the sealing area from the cooling liquid area or the interior space. In the two partitions is preferably in each case an opening through which the sealing portion of the roller is guided. The circumferentially existing distance between the sealing portion and the respective partition is sufficiently large, so that no friction occurs during the rotation of the roller.

The two partitions are arranged such that they delimit the at least one rotating part in the axial direction, ie parallel to the shaft axis. The at least one rotating part should be arranged as possible in such a way that the circumferential gap between the sealing portion and the partitions is closed. It would be advantageous in this case as close as possible contact, so that protection against the penetration of the cooling liquid is formed in the sealing area. The incompletely sealed points between contact surfaces of the two stationary parts and the at least one rotating part in the respective gap region are flowed through by the fluid, which blows the cooling liquid away from the seal.

The fluid advantageously flows through not only the gap region through which the fluid flows into the interior, ie the gap region which is located between the second partition wall and the at least one rotating part, but is also passed through a second gap region extending between the first partition wall and the at least one rotating part is located. The passage of the fluid through the second gap region causes no contamination of the bearing or the food mass between the stationary part and the at least one rotating part can pass, so that wear of the seal can be further reduced.

In an advantageous embodiment of the invention it is provided that the rotating parts consist of two pressing parts, wherein preferably between the two Anpressteilen a preferably rotates with the roller middle part. The central part causes a preferably elastic contact pressure of the two Anpressteile in the axial direction, ie in a direction parallel to the shaft axis direction. The two Anpressteile are preferably pressed against each a stationary part or a partition. By means of the pressurized fluid, the central part is pressed against the sealing portion of the roller or against the adapter and consequently takes place a radial, perpendicular to shaft axis, sealing between the sealing portion and the central part. The central part closes the circumferential gap between the respective partition and the sealing portion of the roller. However, the middle part can also rest on the roll shell with little radial tension.

In order to produce a sufficient flow velocity in the pressurized fluid, it is provided in a particularly advantageous embodiment of the invention that the stationary parts, the Anpressteile, the preferably present central part and the bearing housing define a pressure chamber, which is acted upon by the fluid. The pressure present in the pressure chamber should preferably be 0.3 to 0.5 bar and is thus above the pressure in the coolant region formed by the interior. Consequently, it is prevented that cooling liquid can pass from the inner space into the first gap area and components from the storage area or the product area can reach the second gap area.

Advantageously, it is provided that the central part is rectangular in cross section. Due to the rectangular configuration of the middle part, a large contact surface and thus a particularly reliable tightness between the middle part and the sealing portion of the roller can be achieved. The rectangular cross-section can also be particularly easy and inexpensive to produce. Preferably, the central part is divided in the circumferential direction and can be placed in the open state to the sealing portion, to be closed again preferably form-fitting manner.

Furthermore, it is preferably provided that the middle part extending around the sealing portion has bulges on a circumference facing away from the sealing portion, which correspond with recesses in the pressing parts, so that the pressing parts are rotated along with the middle part located on the rotating roller due to the positive fit resulting in the circumferential direction.

A radial and axial sealing between the middle part and the two pressing parts is made possible by the fact that according to the invention it is provided that at least one pressing part, preferably both pressing parts, is or are L-shaped in cross section. The two pressing parts thus delimit the middle part in each case in a corner region of the central part remote from the sealing section. An outer formed perpendicular to the roll axis straight contact surface of the respective Anpressteils is pressed in the axial direction against the respective stationary part. Preferably, only the central part is pressed against the sealing portion of the roller. The respective pressing part is preferably in one piece and must therefore be pushed onto the sealing portion. Since the inner diameter of the Anpressteiles is slightly larger than the outer diameter of the adapter, there is a small gap between the stationary part and the adapter, so that the attachment is not a problem. A sealing in the radial direction between the sealing portion and the Anpressteilen is not necessary, since the central part with the sealing portion and the central part with the respective Anpressteil causes a sufficient seal.

An inventive embodiment of the invention provides that sliding contact surfaces of the seal form a low-friction and low-wear pairing. Preferably, the contact surfaces are formed by the Anpressteilen with each corresponding stationary parts. Despite sufficient sealing between the central part and the sealing portion of the roller, as well as the central part and the pressing parts, as well as the pressing parts and the stationary parts, the rotational movement of the rollers is not hindered by the seal or the seal is not damaged by the rotation of the roller. The central part and the Anpressteile are preferably not rotated by the bulges and thus corresponding recesses against each other, so that they rotate together with the roller.

According to the invention it is further provided that between two stationary parts of the seal is preferably between two partitions, a spacer ring of the bearing housing, which preferably has the same axial length, as the rotating parts of the seal in the installed state. The spacer ring forms with the two stationary parts and the rotating parts of the seal chamber, which is why the spacer ring should have the same axial length as that of the rotating parts. Advantageously, located in the spacer ring is a small opening through which the fluid is introduced from the pressure source.

embodiments

The invention described above will be explained in more detail using an exemplary embodiment which is illustrated in the figures.

It shows:

1 : A view of a Walzenreibmaschine invention and

2 : A storage area of a roll friction machine according to the invention 1 ,

The 1 shows a rolling mill according to the invention 1 with five rollers 2 , The rollers 2 show in their middle part 3 a substantially cylindrical cavity 4 according to 2 on, with the respective roller axes 5 parallel to each other and horizontally in a machine frame 6 are arranged. On the machine frame 6 are housing walls 7 secured, among other things, storage areas 8th the roller grinder 1 cover. Furthermore separate boundary walls 9 the storage areas 8th from a product area 10 , in which a doughy pasty food mass in the form of a coherent product during a manufacturing process serpentine along the lateral surfaces 11 the rollers 2 is encouraged. Between those of these two rollers 2 formed roller pair is a nip 12 through which the contiguous product film of the food mass is passed.

The rollers 2 are in a product section 13 , at opposite end portions 14 located bearing sections 15 and sealing sections 16 according to 2 divided. The storage sections 15 each consist of a shaft journal 17 , The shaft cones 17 be through an implementation 18 according to 2 from the product area 10 in the storage areas 8th led and are there in each case in a camp 19 according to 2 stored. The rollers 2 can by means of a drive means, not shown, about the respective roller axis 5 to be turned around.

The 2 shows the end section 14 the roller 2 with her shaft journal 17 in a bearing housing 20 , The storage section 15 the roller 2 is in the storage area 8th of the bearing housing 20 arranged. A to the storage section 15 attached adapter 21 forms the sealing portion in this embodiment 16 the roller 2 , The adapter 21 is for example with the bearing section 15 pressed or screwed, which has the consequence that the adapter 21 with the roller 2 around the roll axis 5 rotates. The adapter 21 is the same as the storage section 15 of the shaft journal 17 and the roller 2 hollow from the inside so that coolant can flow through it.

The bearing housing 20 points next to the storage area 8th a sealing area 22 and a cooling liquid area 23 on, in which a traversed with coolant inside 24 located. This interior 24 is at one of the roller 2 distant end 25 of the bearing housing 20 arranged. The interior 24 is through a lid 26 of the bearing housing 20 limited, wherein the lid fluid-tight with the sealing area 22 of the bearing housing 20 is connected. In this lid 26 is a feeder 27 arranged, by means of which cooling liquid into the cavity 4 the roller 2 is directed. The feeder 27 has one in the lid 26 located inlet opening 28 as well as a lance 29 on, through which the cooling liquid is passed. The lance 29 advantageously leads from the inlet opening 28 to the opposite end of the roll, not shown here. From there, the coolant flows through the cavity 4 the roller 2 , the hollow bearing section 15 and the sealing portion 16 until the coolant is the roller 2 over a frontal end 30 , which is the entrance opening 28 facing, leaving and entering the interior 24 of the coolant area 23 flows. About one in the lid 26 of the bearing housing 20 located outlet opening 31 the coolant leaves the roll moulder 1 ,

It should be avoided if possible that the coolant from the interior 24 in the storage area 8th or the adjacent product area 10 the roller grinder 1 flows. To move between the interior 24 and the storage area 8th creating a seal is located in the sealing area 22 a seal 32 , which two stationary parts 33 . 34 (For example, in the form of two partitions) and three rotating parts 35 having, wherein the rotating parts 35 from two press parts 36 . 37 and a middle part 38 consist.

The two stationary parts 33 . 34 each have a breakthrough 39 on, through which the adapter 21 passes, being between the adapter 21 and the stationary parts 33 . 34 a circumferential gap 40 exists, so the adapter 21 during a rotation around the shaft axis 5 not at the stationary parts 33 . 34 along dragging. The first resting part 33 is with the storage area 8th of the bearing housing 20 bolted and borders the storage area 8th from the sealing area 22 from. Then follows a spacer ring 41 that is between the first resting part 33 and the second resting part 34 is arranged. The second resting part 34 is with the spacer ring 41 bolted and separates the sealing area 22 from the coolant area 23 , At this second resting part 34 is again the lid 26 of the bearing housing 20 arranged, which with the second stationary part 33 . 34 the interior 23 forms. The spacer ring 41 has a length L in the axial direction, that of the length L 'of the rotating parts 35 equivalent.

On the adapter 21 is located in the cross-section rectangular central part 38 , wherein at the middle part 38 again the two in cross section L-shaped pressing parts 36 . 37 are arranged. The middle part 38 has not shown bulges on its outer periphery, which with recesses in the two Anpressteilen 36 . 37 correspond, so that the pressing parts 36 . 37 with the middle part 38 and the roller 2 can be rotated.

The press parts 36 . 37 limit the middle section 38 in one of the adapter 21 distant corner area 42 of the middle section 38 , This will seal with the middle part 38 effected in the radial direction. Furthermore, a perpendicular to the rolling axis arranged contact surface 43 the pressing parts 36 . 37 with the help of the middle part 38 against a respective contact surface 44 the stationary parts 33 . 34 pressed, so that a seal in the axial direction comes about. The two pressing parts 36 . 37 glide as smoothly as possible over the two stationary parts 33 . 34 , The middle part 38 , which consists for example of a rubber-like material, is divided in the circumferential direction and thus can be as tight as possible around the adapter 21 be put around. The two pressing parts 36 . 37 are by means of the bulges and recesses so with the middle part 38 connected that only a common rotation with the roller 2 is possible.

The two stationary parts 33 . 34 , as well as the rotating parts 35 form together with the spacer ring 41 a pressure room 45 which is filled with a pressurized fluid. This fluid causes the Anpressteile 36 . 37 in the radial direction sealingly to the middle part 38 and the middle part 38 again sealing to the adapter 21 is pressed.

It is further provided that the fluid along a pressure gradient of the pressure chamber 45 in the interior 24 through a gap area 46 which is between the second resting part 34 and the pressing part 37 is pressed through, so no coolant in this gap area 46 and thus in the sealing area 22 as well as the adjacent storage area 15 and product area 13 can get. A second gap area 47 is located between the first stationary part 33 and the first pressing part 36 , which prevents impurities or food mass from the storage area 8th in the pressure room 45 or between the press part 36 and the stationary part 33 can penetrate.

LIST OF REFERENCE NUMBERS

1

roll refiner

2

roller

3

part

4

cavity

5

roll axis

6

machine frame

7

housing wall

8th

storage area

9

boundary wall

10

product range

11

lateral surface

12

nip

13

product section

14

end

15

bearing section

16

sealing section

17

shaft journal

18

execution

19

camp

20

bearing housing

21

adapter

22

sealing area

23

Coolant area

24

inner space

25

The End

26

cover

27

feeding

28

inlet opening

29

lance

30

The End

31

outlet

32

poetry

33

resting part

34

resting part

35

rotating part

36

press component

37

press component

38

midsection

39

breakthrough

40

gap

41

spacer

42

corner

43

contact area

44

contact area

45

pressure chamber

46

gap region

47

gap region

L

length

L '

length

Claims (8)

Rolling machine ( 1 ) for grinding a doughy pasty food mass, with several parallel aligned, behind and / or one above the other in a machine frame ( 6 ) arranged rollers ( 2 ), which by means of at least one drive device in each case about a roll axis ( 5 ) rotatably drivable, so that the food mass to be ground in the form of a coherent product film by at least one between two adjacent rolls ( 2 ) located nip ( 12 ), whereby the food mass is ground, with each roller ( 2 ) at opposite end portions ( 14 ) each have a storage section ( 15 ) in which it is within a perpendicular to the associated roll axis ( 5 ) relative to the machine frame ( 6 ) displaceable bearing housing ( 20 ), wherein a cavity ( 4 ) of each roller ( 2 ) by means of a feeder ( 27 ) a cooling liquid can be supplied, which at a front end ( 30 ) from the roller ( 2 ) in an interior ( 24 ) of the bearing housing ( 20 ) and the bearing housing ( 20 ) through an outlet opening ( 31 ) leaves, wherein in the interior ( 24 ) of the bearing housing ( 20 ) a seal ( 32 ) is arranged, with the passage of the cooling liquid in the storage area ( 8th ) of the bearing housing ( 20 ) is preventable, and wherein the seal ( 32 ) at least one with the roller ( 2 ) rotating part ( 35 ) and at least one with the bearing housing ( 20 ), with respect to the roller ( 2 ) stationary part ( 33 . 34 ), characterized in that between at least one rotating part ( 35 ) and at least one stationary part ( 33 . 34 ) a gap region ( 46 . 47 ) of a pressurized fluid in a direction on the front end ( 30 ) of the roller ( 2 ) is to flow through. Rolling machine ( 1 ) according to claim 1, characterized in that two stationary parts ( 33 . 34 ) each consist of a partition, which together the at least one rotating part located therebetween ( 35 ) axially and preferably sealed to the bearing housing ( 20 ) connect. Rolling machine ( 1 ) according to one of claims 1 or 2, characterized in that the rotating parts ( 35 ) from two pressed parts ( 36 . 37 ), preferably between the two pressing parts ( 36 . 37 ) preferably with the roller ( 2 ) rotating middle part ( 38 ) is located. Rolling machine ( 1 ) according to one of claims 2 to 4, characterized in that the stationary parts ( 33 . 34 ), the pressing parts ( 36 . 37 ), preferably the middle part ( 38 ) and the bearing housing ( 20 ) a pressure chamber ( 45 ) limit, which is acted upon by the fluid. Rolling machine ( 1 ) according to claim 4 and 5, characterized in that the middle part ( 38 ) is rectangular in cross-section. Rolling machine ( 1 ) according to one of claims 1 to 6, characterized in that at least one pressing part ( 36 . 37 ), preferably both pressing parts ( 36 . 37 ) in cross-section is L-shaped or are. Rolling machine ( 1 ) according to one of claims 1 to 7, characterized in that sliding contact surfaces ( 43 . 44 ) of the seal ( 32 ) form a low-friction and low-wear pairing. Rolling machine ( 1 ) according to one of claims 1 to 8, characterized in that between two stationary parts ( 33 . 34 ) of the seal ( 32 ) preferably between two partitions a spacer ring ( 41 ) of the bearing housing ( 20 ), which preferably has the same axial length (L) as the rotating parts of the seal in the installed state.

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