PELLET PRESS WITH COOLING SYSTEM AND METHOD OF MANUFACTURING PELLETS

Description

Field of the invention

[0001] The present invention relates to a pellet press comprising a roller supporting shaft with a longitudinal axis, the shaft having at a roller support side an end part with a diameter D_EP supporting a bearing roller member rotatable about the shaft, wherein the shaft is provided with a cooling channel having an inner diameter D_I and extending along the longitudinal axis, and a cooling duct extending coaxially within the cooling channel and having an outer surface situated at a distance from a cooling channel wall, the cooling channel and the cooling duct being closed at the roller support side.

Background art

[0002] In WO 2016/195484 a pellet press is described with a supporting shaft and a perforated drum mounted rotatably thereon via a drive member having two spaced-apart bearings. A single roller is provided on the shaft within the drum. The first bearing of the drive member is a radial bearing, the second bearing of the drive member is an axial-radial bearing situated at a larger radial distance from the drum rotation axis than the radial bearing. An axially movable locking bushing is placed around the shaft between the bearing housings of the axial and the axial-radial bearings, the bushing engaging both casings. Other pallet presses are disclosed in CN 201 189 726 Y and CN 202 592 780 U.

[0003] When pelletizing kneadable material with a high viscosity, the bearings of the pellet press can generate too much heat, which may cause the viscosity of the lubricant to become too low to maintain effective lubrication. As a result, the bearings can become damaged and the pellet press requires repairing. Furthermore, when the lubricants becomes too liquid, they may seep into the drum of the pellet press, contaminating the pellets. This is especially undesirable when the pellets are to be used as animal feed, since contaminated feed needs to be discarded.

[0004] Due to the position of the bearings inside the pellet press and the height of the temperature reached by the bearings, air ventilation has proven insufficient.

[0005] An alternative cooling solution is described in US6,299,430, in which the shaft of a pellet press is provided with a cooling medium supply and return passage, providing fluid cooling of the shaft. Heat conduction from the bearings to the cooled shaft results in a lowering of the bearing temperature.

Summary of the invention

[0006] It is an object of the invention to provide a pellet press with more effective bearing cooling.

[0007] Hereto the pellet press according to the invention is characterized in that the roller supporting shaft further comprises at least one bearing cooling channel having first and second radial sections that respectively extend from a roller support side position and from an upstream position of the cooling channel wall, in a radial direction through the end part of the shaft, to an outward end part position near the bearing, and with a third axial section extending through the end part in the axial direction and interconnecting the first and second radial sections, and a fluid seal, situated between the outer surface of the cooling duct and the wall of the cooling channel at an axial position between the axial positions of the first and second radial bearing cooling channel sections.

[0008] Due to the at least one bearing cooling channel extending up to the outward end position close to the surface of the roller supporting shaft where the bearing rolling member is supported on, cooling liquid passes through the roller supporting shaft in close proximity to the bearings. This results in an effective heat exchange between the lubricated bearing and cooling liquid, increasing lubrication effectiveness and reducing roller bearing member failure. Furthermore, due to the improved cooling capacity, the operating temperature of other components of the pellet press is reduced, positively impacting their lifespan as well.

[0009] Through the addition of multiple bearing cooling channels, a higher cooling capacity can be reached, allowing the production capacity and/or speed of the pellet press to be increased. Preferably the cooling system is set up to be able to cool the bearing support shaft back from 200°C to 70°C, providing a more pleasant and safe environment to work in for the operator, due to a reduction in heating of the surroundings of the pellet press. Beneficially, if the cooling capacity is sufficiently high to maintain a temperature of the lubricant in the bearing roller member below 120°C, food grade lubricants can be used, eliminating the risk of contaminating animal feed produced with the pellet press. Furthermore, the added cooling capacity of the shaft results in a reduced power consumption by the pellet press, contributing to a lower CO₂ emission.

[0010] An additional advantage provided by the design of the cooling assembly is that assembly and demounting of the cooling duct inside the cooling channel can be performed by simply inserting the cooling duct together with the fluid seal from a shaft mounting side of the roller support shaft, which is opposite from the roller support side. Thus the implementation of the fluid seal enables ease of manufacturing and maintenance.

[0011] The cooled bearings in the proximity of the bearing cooling channels according to the invention can be the bearings that support the drive member of the drum or the bearings supporting the roller inside the drum or both.

[0012] According to an embodiment, the roller supporting shaft has a main section of a smaller diameter Do than the diameter D_EP of the end part, the end part comprising a cylindrical bearing support surface and a ring-shaped, radially oriented end surface, where the radial bearing cooling channel sections are provided by drilling from the bearing support surface to the cooling channel and the axial bearing cooling channel section is provided by drilling from the ring shaped end surface in an axial direction.

[0013] By drilling the channel sections from the outside surface of the roller support shaft inwards, the ease of manufacturing of the radial bearing cooling channels is improved. If additional cooling capacity turns out to be required at a later moment, additional cooling channels may be added to the roller support shaft as and when required. This manufacturing method also allows for existing shafts being retrofitted with a cooling system according to the invention.

[0014] According to a further embodiment, at the bearing support surface and at the radially oriented end surface, the bearing cooling channel sections are closed by a plug member.

[0015] The plug members ensure that the cooling system is a closed system, separated from the lubrication system. The plug members close off the drilled cooling channels and ensures that the cooling water cannot mix with the roller lubricants and/or contaminate the kneadable material.

[0016] According to an embodiment, the fluid seal comprises at least one O-ring.

[0017] Due to equal pressure on both sides of the seal when the cooling system is running, the seal can be relatively thin and flexible. This allows the rings seal to be a simple O-ring.

[0018] According to a further embodiment, the shaft is at a shaft mounting side provided with a rotatable coupling comprising connector members for connecting a fluid supply duct and a fluid return duct to the cooling channel and to the cooling duct respectively.

[0019] The rotatable coupling allows the shaft itself to rotate when required, as an emergency system when a rotational force on the shaft becomes too high in order to prevent damage, for example due to a friction force between the roller and perforated drum mounted on and driven via the shaft exceeding a maximum force.

[0020] According to an embodiment, the pellet press further comprises a cooling member and a pump connected to the cooling channel and the cooling duct for supplying cooled cooling fluid to the channel or duct, a temperature sensor for measuring a cooling fluid temperature of heated return fluid coming from the cooling channel or cooling duct, and a controller for controlling the rotation speed of a drive member which is mounted on the roller supporting shaft via the bearing and adapted to rotate a perforated drum supported on the end part of the shaft around the longitudinal axis L depending on the measured temperature.

[0021] The cooling member receives the heated cooling fluid exiting the roller support shaft and cools the fluid back to a predetermined lower cooling temperature before the pump pumps the cooling fluid back into the roller support shaft. The cooling member and pump thus allow for recycling of the cooling fluid. In a preferred set-up the cooling member comprises a radiator and a fan. This set-up has the advantage that hot air, released in the radiator, can be led away via an exhaust to a desired location, for example outside, allowing a comfortable working temperature being maintained in the working facilities around the pellet press.

[0022] Through the addition of the temperature sensor measuring the heated return fluid, the condition of the pellet press is monitored and the controller can adjust the rotation speed of the drum to maintain the temperature at the bearing roller member resulting from the drum rotation within an optimum range. As previously stated, at bearing roller member temperatures which are too high, damage is risked due to lubricant becoming less effective. At bearing roller member temperatures which are too, the viscosity of the lubricant increases becomes too high, also having an adverse effect on the effectiveness of the machine. Thus in order to keep the pellet press optimally operating, the temperature of the bearing roller member needs to be kept optimal. Through the addition of the temperature sensor providing feedback to the controller, the controller can automatically adjust operation parameters of the pellet press to maintain this optimum temperature.

[0023] Further, the controller may be adapted to adjust the roller rotation speed and/or distance between the roller and the drum. Alternative or additional to the controller controlling the rotation speed of the drum, the controller may also be connected to the cooling member and/or pump and adapted to adjust a cooling rate and/or pumping speed at which the cooling member or pump operates depending on the measured temperature.

Short description of drawings

[0024] Embodiments of a pellet press according to the present invention will be described by way of example, with reference to the attached drawings, in which

Fig. 1 shows a cross section of a pellet press with cooled drive member bearings according to the invention;

Fig. 2 shows a detailed view of the shaft in section II of Fig. 1; and

Fig. 3 shows a perspective view of the shaft section of Fig. 2

Description of embodiments

[0025] Fig. 1 shows a pellet press 100 having a roller support shaft 10 with a longitudinal axis L, a shaft mounting side 11, for being supported by a machine frame (not shown) and a roller support side 19 having an end part supporting a perforated drum 90 that is rotated around the longitudinal axis L via a drive member 48. The drive member 48 is mounted on the support shaft 10 via an axial-radial bearing 20, positioned near the end part 19 of the shaft 10, and a radial bearing 21, positioned near the shaft mounting side 11. For providing a rigid construction, the drive member 48 is formed in one piece of cast iron.

[0026] At the end part 19, a roller 80 is mounted on the support shaft 10 to be rotatable around a roller axis R that is spaced at a distance from the longitudinal axis L. The roller 80 is driven by frictional engagement between the outer roller surface 81 and the inner drum surface 91 via the kneadable material that is squeezed in the gap between the roller 80 and the drum 90 prior to being extruded through the perforations of the drum to form pellets.

[0027] The pellet press 100 is provided with a cooling system, which is shown to comprise internal cooling channels and ducts 30, 32, 34 in the roller support shaft 10, a cooling member 42, a pump 40, a temperature sensor 44 and a controller 46. The internal cooling channels and ducts 30, 32, 34 are connected to the cooling member 42 via a rotatable coupling 15, having connector members 17 for connecting a fluid supply duct 7 and a fluid return duct 8 to the internal cooling channels and ducts 30, 32, 34, allowing a cooling fluid such as water being circulated and reused. The pump 40 is located between the cooling member 42 and the supply duct and is adapted to pump the cooling fluid into the internal cooling channels. The temperature sensor 44 is arranged in the fluid return duct 8 for measuring a cooling fluid temperature of heated return fluid coming from the internal cooling channels 30, 32, 34. With an output, the temperature sensor 44 is connected to the controller 46, which is arranged to control the rotation speed of the drive member 48 with respect to the roller support shaft 10 and the pumping rate of the pump 40 depending on the measured temperature. The rotatable coupling 15 of the cooling system allows for a rotation of the roller support shaft 10 within the machine frame, with respect to the fluid supply duct 7 and fluid return duct 8, which rotation may occur as a safety feature preventing overload in the event that a friction force between the drum 90 and the roller 80 exceeds a predetermined maximum force. Details of the internal cooling channels and ducts 30, 32, 34 inside the roller support shaft 10 are further discussed in reference to Figs. 2 and 3.

[0028] Figs. 2 and 3 respectively Fig. 2 show a detailed view and a perspective view of the shaft in section II of Fig. 1. The roller support shaft 10 has a main section 18 having an outer diameter Do which extends from the shaft mounting side up to the end part at the roller support side 11, having a larger diameter D_EP. A ring-shaped, radially oriented end surface 24 provides a transition between the main section 18 and the end part at the roller support side 19. An outer surface section of the end part directly adjacent to the ring-shaped, radially oriented end surface 24 forms a bearing support surface 22, having a length along the longitudinal axis L sufficiently long to support the bearing roller member 20 for having the drive member 48 is mounted on the support shaft 10.

[0029] The internal cooling channels and ducts inside the shaft 10 are shown in Fig. 2 with a cooling duct 32, a cooling channel 34 and a plurality of bearing cooling channels 30. The cooling channel 34 32 is a cylindrical channel with inner diameter Di, preferably being between 40 - 70 mm, which extends along the longitudinal axis L in the centre of the shaft 10 from the shaft mounting side 11 towards the roller support side 19, extending along substantially the full length of the bearing support surface 22 when seen along the longitudinal axis L. The cooling duct is coaxial with the cooling channel 34 and positioned inside the cooling channel 34 having an outer surface 31 at a distance dw between 5 - 25 mm from an inner wall 33 of the cooling channel 34. The cooling duct 32 has a length which is shorter than a length of the cooling channel 34 and extends from the shaft mounting side 11 to a position past the ring-shaped radially oriented end surface 24 seen along the longitudinal axis L. The cooling channel 34 is closed at the roller support side 19. At the roller support side 19 the cooling duct 32 is along its outer perimeter provided with an O-ring 36 which seals the end of the cooling duct 32 against the inner wall 33 of the cooling channel 34, preventing cooling fluid from directly flowing from the cooling duct 32 via the cooling channel 34 to the fluid return duct 8. As a result, a section 35 of the cooling channel 34 which extends past the O-ring 36 and past the end of the cooling duct 32 at the roller support side 19 is closed off from the remainder of the cooling channel extending from the shaft mounting side 11 and is in open connection with the end of the cooling duct 32 at the roller support side 19 for distribution of cooling fluid into the multiple radial ducts 30b.

[0030] At the position of the bearing support surface 22 the roller support shaft 10 is provided with the bearing cooling channels 30 connecting section 35 to the upstream part of the cooling channel 34, forming a flow path for the cooling fluid through the cooling system. In this flow path, the end of the cooling duct 32 at roller support side 19 is upstream from the end of the cooling duct 32 at the shaft mounting side 11 and the end of the cooling channel 34 at the shaft mounting side 11 is upstream from the end of the cooling channel 34 at the roller support side 19.

[0031] Each bearing cooling channel 30 has first, second and third sections 30a, 30b, 30c. The first and second sections 30a, 30b are radial sections which each extend from a position in the cooling channel wall 33, radially outward toward an end position below the bearing support surface 22. The first sections 30a extend outward from the section 35, which, due to having a plurality of radial openings, forms a spray head. The second sections 30b extend outward from a position adjacent to the O-ring 36 on a side facing the upstream end of the cooling channel 34. The third section 30c of each bearing cooling channel 30 extends in the axial direction through the end part of the roller support side, interconnecting the end positions of the first and second radial sections 30a, 30b. Preferably, the end positions of the first and second sections 30a, 30b are between 5 and 50 mm from the bearing support surface 22. For ease of manufacturing, the first and second sections 30a, 30b are drilled radially inward from the bearing support surface 22 into the cooling channel wall 33 and the third sections 30c are drilled from the ring-shaped, radially oriented end surface 24 through the end position of the second radial sections 30b and into the first radial sections 30a. The resulting drill holes in the bearing support surface 22 and the ring-shaped, radially oriented end surface 24 are closed off with plugs 38, in order to ensure a closed cooling system in the shaft and prevent contamination of bearing lubricant and the kneadable material in the perforated drum 90.

[0032] The roller 80 depicted in Fig. 1 also comprises bearings, which may be cooled similarly, by extending the cooling system as described above.

Claims

1. A pellet press (100) comprising a roller supporting shaft (10) with a longitudinal axis (L), the shaft (10) having at a roller support side (12) an end part with a diameter D_EP supporting a bearing (20) and a rotation member (48) rotatable about the shaft (10), wherein the shaft (10) is provided with a cooling channel (32) having an inner diameter D_I and extending along the longitudinal axis (L), and a cooling duct (34) extending coaxially within the cooling channel (32) and having an outer surface (33) situated at a distance (dw) from a cooling channel wall (31), the cooling channel (32) and the cooling duct (34) being closed at the roller support side (12),

characterised in that the roller supporting shaft (10) further comprises at least one bearing cooling channel (30) having first and second radial sections (30a, 30b) that respectively extend from a roller support side position and from an upstream position of the cooling channel wall (31), in a radial direction through the end part of the shaft (10), to an outward end position near the bearing (20), and with a third axial section (30c) extending through the end part in the axial direction and interconnecting the first and second radial sections (30a, 30b), and

a fluid seal (36), situated between the outer surface of the cooling duct (33) and the wall of the cooling channel (31) at an axial position between the axial positions of the first and second radial bearing cooling channel sections (30a, 30b).

2. The pellet press (100) according to claim 1, wherein the roller supporting shaft (10) has a main section (18) of a smaller diameter Do than the diameter D_EP of the end part, the end part comprising a cylindrical bearing support surface (22) and a ring-shaped, radially oriented end surface (24), where the radial bearing cooling channel sections (30a, 30b) are provided by drilling from the bearing support surface (22) to the cooling channel (32) and the axial bearing cooling channel section (30c) is provided by drilling from the ring shaped end surface (24) in an axial direction.

3. The pellet press (100) according to claim 2, wherein at the bearing support surface (22) and at the radially oriented end surface (24), the bearing cooling channel sections (30a, 30b, 30c) are closed by a plug member (38).

4. The pellet press (100) according to any one of the preceding claims, wherein the fluid seal (36) comprises at least one O-ring.

5. The pellet press (100) according to any one of the preceding claims, the shaft (10) being at a shaft mounting side (11) provided with a rotatable coupling (15) comprising connector members (17) for connecting a fluid supply duct (7) and a fluid return duct (8) to the cooling channel (32) and to the cooling duct (34) respectively.

6. The pellet press (100) according to any of the preceding claims, further comprising

a cooling member (42) and a pump (40) connected to the cooling channel (32) and the cooling duct (34) for supplying cooled cooling fluid to the channel or duct,

a temperature sensor (44) for measuring a cooling fluid temperature of heated return fluid coming from the cooling channel (32) or cooling duct (34), and

a controller (46) for controlling the rotation speed of a drive member which is mounted on the roller supporting shaft via the bearing (20) and adapted to rotate a perforated drum (90) supported on the end part of the shaft (10) around the longitudinal axis (L) depending on the measured temperature.

Ansprüche

1. Pelletpresse (100), die eine Rollenträgerwelle (10) mit einer Längsachse (L) umfasst, wobei die Welle (10) an einer Rollenträgerseite (12) einen Endteil mit einem Durchmesser D_EP aufweist, der ein Lager (20) und ein um die Welle (10) drehbares Drehelement (48) trägt, wobei die Welle (10) mit einem Kühlkanal (32), der einen Innendurchmesser D_I aufweist und sich entlang der Längsachse (L) erstreckt, und einer Kühlleitung (34) versehen ist, die sich koaxial innerhalb des Kühlkanals (32) erstreckt und eine Außenfläche (33) aufweist, die sich in einem Abstand (dw) von einer Kühlkanalwand (31) befindet, wobei der Kühlkanal (32) und die Kühlleitung (34) an der Rollenträgerseite (12) geschlossen sind,

dadurch gekennzeichnet, dass die Rollenträgerwelle (10) ferner mindestens einen Lagerkühlkanal (30) mit ersten und zweiten radialen Abschnitten (30a, 30b) umfasst, die sich jeweils von einer Rollenträgerseitenposition und von einer stromaufwärtigen Position der Kühlkanalwand (31) in einer radialen Richtung durch den Endteil der Welle (10) zu einer äußeren Endposition in der Nähe des Lagers (20) erstrecken, und mit einem dritten axialen Abschnitt (30c), der sich durch den Endteil in der axialen Richtung erstreckt und die ersten und zweiten radialen Abschnitte (30a, 30b) verbindet, und

eine Fluiddichtung (36), die sich zwischen der Außenfläche der Kühlleitung (33) und der Wand des Kühlkanals (31) in einer axialen Position zwischen den axialen Positionen der ersten und zweiten Radiallager-Kühlkanalabschnitte (30a, 30b) befindet.

2. Pelletpresse (100) nach Anspruch 1, wobei die Rollenträgerwelle (10) einen Hauptabschnitt (18) mit einem kleineren Durchmesser Do als der Durchmesser D_EP des Endteils aufweist, wobei der Endteil eine zylindrische Lagerträgeroberfläche (22) und eine ringförmige, radial ausgerichtete Endfläche (24) umfasst, wobei die Radiallager-Kühlkanalabschnitte (30a, 30b) durch Bohren von der Lagerträgeroberfläche (22) zu dem Kühlkanal (32) bereitgestellt werden und der Axiallager-Kühlkanalabschnitt (30c) durch Bohren von der ringförmigen Endfläche (24) in einer axialen Richtung bereitgestellt wird.

3. Pelletpresse (100) nach Anspruch 2, wobei an der Lagerträgeroberfläche (22) und an der radial ausgerichteten Endfläche (24) die Lagerkühlkanalabschnitte (30a, 30b, 30c) durch ein Stopfenelement (38) verschlossen sind.

4. Pelletpresse (100) nach einem der vorhergehenden Ansprüche, wobei die Fluiddichtung (36) mindestens einen O-Ring umfasst.

5. Pelletpresse (100) nach einem der vorhergehenden Ansprüche, wobei die Welle (10) an einer Wellenmontageseite (11) mit einer drehbaren Kupplung (15) versehen ist, die Verbindungselemente (17) zum Anschließen einer Fluidzufuhrleitung (7) und einer Fluidrückführleitung (8) an den Kühlkanal (32) bzw. an die Kühlleitung (34) umfasst.

6. Pelletpresse (100) nach einem der vorhergehenden Ansprüche, die ferner Folgendes umfasst:

ein Kühlelement (42) und eine Pumpe (40), die mit dem Kühlkanal (32) und der Kühlleitung (34) verbunden sind, um dem Kanal oder der Leitung gekühlte Kühlflüssigkeit zuzuführen,

einen Temperatursensor (44) zum Messen einer Kühlflüssigkeitstemperatur von erwärmter Rückflüssigkeit, die aus dem Kühlkanal (32) oder der Kühlleitung (34) kommt, und

eine Steuerung (46) zum Steuern der Drehgeschwindigkeit eines Antriebselements, das über das Lager (20) auf der Rollenträgerwelle montiert ist und dazu geeignet ist, eine perforierte Trommel (90), die an dem Endteil der Welle (10) gelagert ist, in Abhängigkeit von der gemessenen Temperatur um die Längsachse (L) zu drehen.

Revendications

1. Presse à pellets (100) comprenant un arbre de support de rouleau (10) avec un axe longitudinal (L), l'arbre (10) ayant au niveau d'un côté de support de rouleau (12) une partie d'extrémité de diamètre D_EP supportant un roulement (20) et un élément de rotation (48) rotatif autour de l'arbre (10), où l'arbre (10) est pourvu d'un canal de refroidissement (32) ayant un diamètre intérieur D_I et s'étendant le long de l'axe longitudinal (L), et un conduit de refroidissement (34) s'étendant coaxialement à l'intérieur du canal de refroidissement (32) et ayant une surface extérieure (33) située à une distance (dw) d'une paroi du canal de refroidissement (31), le canal de refroidissement (32) et le conduit de refroidissement (34) étant fermés du côté de support de rouleau (12),

caractérisé en ce que l'arbre de support de rouleau (10) comprend en outre au moins un canal de refroidissement de roulement (30) ayant une première et deuxième sections radiales (30a, 30b) qui s'étendent respectivement depuis une position latérale de support de rouleau et depuis une position en amont de la paroi du canal de refroidissement (31), dans une direction radiale à travers la partie d'extrémité de l'arbre (10), jusqu'à une position d'extrémité vers l'extérieur près du roulement (20), et avec une troisième section axiale (30c) s'étendant à travers la partie d'extrémité dans la direction axiale et interconnectant la première et deuxième sections radiales (30a, 30b), et

un joint d'étanchéité (36), situé entre la surface extérieure du conduit de refroidissement (33) et la paroi du canal de refroidissement (31) à une position axiale entre les positions axiales de la première et deuxième sections radiales du canal de refroidissement de roulement (30a, 30b).

2. Presse à pellets (100) selon la revendication 1, où l'arbre de support de rouleau (10) a une section principale (18) d'un diamètre Do inférieur au diamètre D_EP de la partie d'extrémité, la partie d'extrémité comprenant une surface de support de roulement cylindrique (22) et une surface d'extrémité (24) en forme d'anneau orientée radialement, où les sections radiales du canal de refroidissement de roulement (30a, 30b) sont obtenues par perçage depuis la surface de support de roulement (22) jusqu'au canal de refroidissement (32) et la section axiale du canal de refroidissement de roulement (30c) est obtenue par perçage depuis la surface d'extrémité en forme d'anneau (24) dans une direction axiale.

3. Presse à pellets (100) selon la revendication 2, où à la surface de support de roulement (22) et à la surface d'extrémité orientée radialement (24), les sections du canal de refroidissement de roulement (30a, 30b, 30c) sont fermées par un élément d'obturation (38).

4. Presse à pellets (100) selon l'une quelconque des revendications précédentes, où le joint d'étanchéité (36) comprend au moins un joint torique.

5. Presse à pellets (100) selon l'une quelconque des revendications précédentes, l'arbre (10) étant au niveau d'un côté de montage de l'arbre (11) pourvu d'un accouplement rotatif (15) comprenant des éléments de connecteur (17) pour connecter un conduit d'alimentation en fluide (7) et un conduit de retour de fluide (8) au canal de refroidissement (32) et au conduit de refroidissement (34) respectivement.

6. Presse à pellets (100) selon l'une quelconque des revendications précédentes, comprenant en outre

un élément de refroidissement (42) et une pompe (40) connectés au canal de refroidissement (32) et au conduit de refroidissement (34) pour fournir du fluide de refroidissement refroidi au canal ou au conduit,

un capteur de température (44) pour mesurer une température de fluide de refroidissement du fluide de retour chauffé provenant du canal de refroidissement (32) ou du conduit de refroidissement (34), et

un contrôleur (46) pour contrôler la vitesse de rotation d'un élément d'entraînement qui est monté sur l'arbre de support de rouleau via le roulement (20) et adapté pour faire tourner un tambour perforé (90) supporté sur la partie d'extrémité de l'arbre (10) autour de l'axe longitudinal (L) en fonction de la température mesurée.

Drawing