FI122004B - Arrangement for sealing the roll end of a paper / board or finishing machine - Google Patents

Description

Arrangement for sealing the roll end of a paper / board or finishing machine

The present invention relates to an arrangement for sealing the end of a roll of a paper / board or finishing machine, which roll comprises an inner shaft having a cylindrical bombarded central portion having a shaft pin at each axial end surrounded by a radial clearance in the outer casing, at its axial ends of the radially inwardly extending end flanges, which are fitted around the respective shaft journal, wherein the fluid 10 in the roll medium is circulated through the roll from an external medium revolutions of the inner shaft inside of the inner shaft central portion of the outer surface of the outer shell the inner surface of the medium at between to and from the inner shaft through the inside of the back of the roll to an external circuit.

Figure 1 shows one such roller as disclosed in the applicant's previous Finnish patent application FI20065824. The roll 10 comprises an axis 12 formed by a cylindrical center portion 12c and axial ends 12a, 12b at both ends of the central portion 12c, which are mounted on end bearings 13a, 13b. The center portion 12c of the shaft 12 is a bombee-20 gear and is fitted with a cylindrical jacket 11 supported at both ends by end pieces 20a, 20b to the ends of the center portion 12c of the shaft 12. Each end piece 20a, 20b is secured by bolts 21b to the ends of the sheath 11. Each end piece 20a, 20b is further sealed with seals 31a, 31b to the end of the shell 11 and seals 30a, 30b to the shaft pin 12a, § 25 12b. Each end piece 20a, 20b is disposed around the shaft pin 12a, 12b "such that the fitting permits a small amount of radial movement. End piece | The slats 20a, 20b move along the sheath 11 slightly radially relative to the pins 12a, 12b in a situation where the sheath 11 is subjected to external loading.

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A first passage 40 is formed through one end of the roll pin 12b of the roll 10, extending axially spaced from the opposite end of the roll end end 20a, where it branches into a plurality of radial passageways 41. These radial passageways 41 extend into the space 12c of the shaft 5 . In addition, a second channel 50 is formed through the shaft pin 12b which surrounds the first channel 40 and extends axially inside the end piece 20b at the shaft pin 12b, where it branches into radial channels 51. These radial channels 51 also open to the central portion 12 of the shaft 12c. mode. Along the first passage 40, oil may be introduced into the space 42 between the center 12c of the shaft 12 and the shell 11 near the opposite end piece 20a, from where the oil is led back through the grooves on the outer surface of the center 12c to the end piece 20b. The first passageway 40 may 15 consist of a tube. Instead of straight or spiral grooves formed on the outer surface of the center portion 12c of the shaft 12, the outer surface of the central portion 12c of the shaft 12 may be provided with straight or spiral bronze moldings. In this case, grooves or channels for oil are formed between the bronze moldings. The bom burring of the central portion 12c of the shaft 12 can then be accomplished by machining bronze molds.

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As a result of bombardment of the central portion 12c of the shaft 12, the roller 10 acts like a flex-compensated roller. In the unloaded condition, the inner surface of the shell 11 is attached to the outer surface of the center 12c at center of center 12c, but the ends 12c have a small gap between inner surface S 25 of shell 11 and outer surface of central 12c (Fig. 1 is exaggerated because of). With a roll diaper 11 is loaded externally, e.g. by a second roller, the center portion 12c of the shaft 12 begins to deflect from the center and at a given load the deflection is

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g that the inner surface of the outer sheath 11 abuts along the outer surface of the center portion 30c of the shaft 12 throughout its travel, whereby the outer surface of the sheath 11 is straight at the point of loading. The roll bombardment may be dimensioned such that the outer surface of the sheath 11 becomes straight under the desired loading conditions.

When feeding a medium flowing to such a roll, e.g. hot oil for heating the jacket or cooling medium for cooling the jacket, sealing is required between the jacket and the body to allow movement of the articles to be sealed relative to each other. Due to the construction of the roll, the axes of rotation of the shell and the shaft are slightly offset from one another. The problem with sealing is that the inner axis of the roll deflects due to loading and the outer sheath 10 does not, whereby a continuous radial movement is produced as the roll rotates. In addition, the roll shell is arranged to rotate when the shaft is loaded and this causes a slight angular velocity difference between the shell and the rotational movements of the shaft which rotates the seal in the axial direction. The angular velocity difference results in a velocity difference (slip) between the surfaces to be sealed, which may be, for example, in the range of about 30 mm / s.

It is an object of the present invention to provide a roll end sealing solution that minimizes strain on seals and thus increases seal life and is relatively inexpensive and easy to implement. To achieve this object, the sealing arrangement according to the invention is characterized in that a sealing surface forming part of a spherical surface is formed on the outer surface of the end flange, that the sealing surfaces forming part of the spherical surface of the end flange and the fastening body are oriented towards each other. 25 sealing members and a metal bell placed between the sealing members for loading the sealing members against the sealing surfaces.

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Preferred embodiments of the invention are described in the dependent claims.

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The invention will now be further described with reference to the accompanying drawings, in which:

Fig. 1 is a schematic schematic view of a roll to which the present invention relates;

Figure 2 is a schematic schematic view of an embodiment of a seal arrangement according to the invention; Figure 3 is an enlarged view of an exemplary embodiment of Figure 2;

Fig. 4 is a schematic schematic view of another embodiment of the invention; Figure 5 is an enlarged view of a portion of the embodiment of Figure 4;

Fig. 6 is a schematic diagram showing a coupling means arrangement for coupling a roll jacket and a roll axis; 20

Fig. 7 shows a coupling means according to Fig. 6 positioned at the end of a roll and provided with the sealing members shown in part in the figure; δ cm 0 25 Fig. 8 is a longitudinal sectional view of the embodiment of Fig. 7 such that "the sealing members are shown only at the bottom of the image,

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Figure 9 is a schematic perspective view of a sealing solution

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g with roller sheath and shaft coupled to each other, Fig. 10 is a cross-sectional view of the solution of Fig. 9,

Figure 11 shows a schematic longitudinal section of a coupling arrangement between the sheath and the shaft, and Figure 12 shows a partially sectioned perspective view of the arrangement of Figure 11.

Figs. 2 and 3 show a sealing arrangement 100 according to a first embodiment of the invention, comprising an axially outwardly facing sealing surface 101 formed on the outer surface of the end flange 20 near the shaft pin 12a, formed as a part of the spherical surface; a corresponding sealing surface 104 forming a spherical surface portion directed axially inwardly toward the first sealing surface 101. This first embodiment comprises sealing members 102, 105 supported against said sealing surfaces and formed with a mating surface substantially joined to the sealing members. 107 which loads the sealing members against the sealing surfaces. The arrangement further comprises a protective sleeve 106 extending around the metal bell 20 107 and the sealing members 102, 105 to prevent any bulging of the bellows outward. Further, sealing members 108, preferably push-in seals, are provided between the attachment piece 103 and the shaft pin 12a by means of a tensioning piece 120 disposed in the axial direction and secured by screws 121 to the piece 103.

00 | Figures 4 and 5 show another embodiment of the present invention, which likewise has an

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The gasket sealing surfaces 101 and 104 formed on the outer surface of the end flange 20 at an angle of 30 and an axially spaced fixing member 103. The fixing member is further provided with a sealing member 119 facing the shaft pin 12 which is tightened by means of a tensioning member 120. 2 and 3, in which the metal plate 43 disposed between the sealing surfaces 101,104 is connected to a first sleeve portion 111 at its end facing the roll end flange 20 and to a second sleeve portion 112 at its end facing the fastening piece 53. The sleeve portions are spaced relative to one another. axially movable and locked against their mutual rotational movement, e.g. by wedge member 116, to protect the steel bellows from torsional stress.

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Figure 5 shows the actual sealing members on an enlarged scale at the end of the fastening piece 103, the sealing members on the end flange 20 being substantially identical. The sealing members include a guide body 117 resting against the sealing surface 104, the counter surface facing the sealing surface 15 being similarly shaped in the shape of a portion of the ball surface. A sealing film 118 extending substantially radially is disposed between the guide member 117 and the sleeve portion 112, which initially seals at its lower edge against the sealing surface with its own tension. When the oil pressure is applied to the membrane, the sealing force and the sealing density increase. The material 20 of the sealing film 118 may be, for example, steel, coated steel, brass, or other suitable sealing material. In this solution, the sheath sleeve surrounding the sealing arrangement 110 is comprised of two telescopically engaging portions 114 and 115, the part 114 being secured to the end flange 20 and the shaft pin 12 of the part 115, the part 114 acting as a guard for the metal bellows 113 preventing it from bulging outwardly “Jyn splash guard.

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Figs. 6-8 show an arrangement for obtaining a roll shell and a roll axis

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g are locked together so that they rotate at the same angular velocity, while allowing the shell to move radially with respect to the shaft in the radial direction by an amount of clearance between the shell and the shaft. Such a switch arrangement is preferably located at each end of the roll, whereby they synchronize the sheath and the axis so that the direction of the sheath can deviate substantially from the axis only in one plane. This coupling arrangement includes a coupling piece 201 to be connected to the roll shaft 12 and a coupling piece 202 to be connected to the roll shell 5 and a spacer 203 therebetween. The coupling pieces and spacers are provided with slots 206 and teeth 205 and ball bearings formed therein. The sealing between the sheath 11 and the shaft 12 is accomplished by a metal beam 207 to which a support member 209 is attached. A sealing member 208 is disposed between the support member and the shaft pin 10 12a and secured by an end member 210. Preferably, the sealing member is a carbon fiber sealing strip which, in this solution, does not move due to the mutual rotational locking of the roll axis and the sheath by the coupling means. In this way, a leak-free oil circulation between the shaft and the sheath is provided, and at the same time lubrication and protection of the balls of the clutch-15 structure from impurities. The steel bellows 207 may also be made in two parts, with one part secured to the shaft pin 12 and the spacer 203 with the other part secured between the intermediate part 203 and the roll shell 11.

Figures 9 and 10 illustrate a sealing arrangement in the case where the roll shaft and the sheath are locked to one another, e.g., by means of a clutch arrangement not shown. This seal arrangement includes a seal 220 which can be secured in place, for example, in a manner similar to non-rubber tires for cars. Alternatively, the gasket may also be secured by gluing, mangling, or by attaching a screw connection to the metal rings which are secured to the sheath and shaft. Between the end piece 20 of the housing 11 and the fastening portion 221 located on the shaft 12a | the set seal 220 does not move relative to the shaft and the sheath when locked g to each other. However, the gasket allows the radial alignment of the shaft and the shell

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g its motion. Such a sealing structure is leak-proof, simple and delicate in motion and, due to the connection between the shell and the shaft, has no abrasive parts.

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Figures 11 and 12 are a schematic schematic view of an alternative connection arrangement for the arrangement shown in Figures 6-8. This coupling arrangement includes a lamella-shaped coupling member 300 on the side of the end flange 20 and a second lanyard coupling member 301 disposed on an attachment piece 307 disposed on the shaft pin 12a, with spacer member 302 disposed between the coupling structures. and a second seal 303b secured by a steel clamping band around an axially inwardly extending extension 308 of the fastener 307. An O-ring seal 306 is disposed between the extension 308 and the actuator pin 12a. Due to the coupling structures 300, 301, the sealing members 303a, 303b do not move relative to the shaft and the casing, thereby making the structure substantially leak-free.

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Claims (7)

An arrangement for sealing the roll end of a paper / cardboard or finishing machine, said roller having an inner shaft (12) having a cylindrical bombed center portion (12c) with a shaft pin (12a, 12b) at both axial ends, said center portion surrounded by a radial clearance of an outer sheath (11), the outer sheath having radially inwardly extending end flanges (20a, 20b) which are adapted around the corresponding shaft (12a, 12b), on which shaft a fastening piece (103) is disposed at an axial distance from the outside of the end flange, which mounting piece is provided with a sealing surface (104) forming part of a spherical surface, wherein the medium flowing into the roller is circulated from the outer media circulation of the roller via (40, 41). ) the inner part of the inner shaft into a media space (42) between the outer part of the inner shaft and the inside of the outer sheath and from there back to the inside of the inner shaft (51) and back (50) to the outer circulation of the roller, characterized t, that on the outside of the end flange (20) a sealing surface (101) forming part of a spherical surface is formed, that the sealing surfaces (101, 104) forming part of the spherical surface of the end flange and the fastening piece (103), are directed towards each other, and that the arrangement has sealing means (102, 105; abutting) on said sealing surfaces. 118) and a metal bellows (107; 113) arranged between the sealing means for securing the sealing means to the sealing surfaces. 2. Arrangement according to claim 1, characterized in that the metal bellows (107) is directly connected to the sealing means (102, 105), the sealing means having a substantially sealing surface shape corresponding to the abutment surface. 00 3. Arrangement according to claim 1, characterized in that the arrangement g has axially movable telescopically mutually mutually mutually displaceable parts (111, 112), which hollow portions are arranged so as to provide the entire sealing member (118) against sealing surfaces (101, 104) by means of the metal bellows (113) arranged between the hollow parts. 4. Arrangement according to claim 3, characterized in that the sealing means comprise a guide portion (117) abutting against the sealing surface and an axial end between the guide portion and the hollow (111; 112), substantially in a sealing film (118) arranged in a radial pane. which gives rise to the actual seal by abutting within its radially inner edge region against said seal surface (101, 104). 5. Arrangement according to claim 3 or 4, characterized in that the hollow parts are located at one another (116) relative to a movement in the direction of rotation. 10 Arrangement according to any of the preceding claims, characterized in that the arrangement has a sealing member (108; 119) abutting against the shaft pin (12) which is arranged to be secured in place by means of the fastening piece (120). 15 An arrangement for sealing the roll end of a paper / cardboard or finishing machine, said roll having an inner shaft (12) having a cylindrical bombed center portion (12c) with a shaft pin (12a, 12b) at both axial ends, surrounding said center portion with a radial clearance of an outer casing (11), the outer casing having at axial ends radially inwardly extending end flanges (20a, 20b) which are adapted around the corresponding shaft pin (12a, 12b), in which medium flowing in the roller is circulated from the outer media circulation of the roller via (40, 41) the inner portion of the inner shaft to a media space (42) between the outside of the inner axis of the inner shaft and the inside of the outer sheath and thence back to the inside (51) of the inner shaft and back (50) to the outer circulation of the roller , which has an arrangement between the end flange (20) and the shaft pin (12a). coupling means with which the mutual rotation g of the shaft and outer casing is prevented, enabling their mutual radial movement and sealing means, CM g characterized in that the coupling means are formed by a coupling piece (202; 300) which can be connected to the roller shaft ( 202; 301) and a connecting member (203; 302), and the sealing means (208; 303a, 303b) of the arrangement being arranged in conjunction with the coupling means in a position between non-sliding surfaces outside the end flange ( 202; 20). δ (M sj- o 00 X and CL 00 σ> {M m oo o o {M