FI113887B - Arrangement for removing hydraulic fluid from roll - Google Patents

Description

113887 Arrangement for removing hydraulic fluid from roll

BACKGROUND OF THE INVENTION The present invention relates to a hydraulic fluid discharge arrangement of a deflection compensated roll for a paper / board machine or a finishing machine having a stationary central axis and a a rotatably mounted housing structure for collecting hydraulic fluid leaving the roll.

Oil removal from the roll is important because reducing the amount of oil inside the roll results in lower power consumption on the roll gear, lower internal temperature of the roll, and longer life of the internal components of the roll. Nowadays in deflection compensated rolls, the hydraulic medium introduced inside the rolls is "scraped" by means of loading elements into various enclosures and tanks. This is a very simple and reliable way. However, in this case, various outlet ducts, as well as picking and guiding structures and housings, must be provided on the roll axis. Such solutions have been presented e.g. jul-20 in WO 00/17530, FI-105356, US 6,454,685 and DE 20102620.

/ '; * Transfer of media collected by various control or picking structures to the end of the roll; : prior art from the area and out of the roll, e.g. divisive catcher or siphon solutions. Known capture solutions are disclosed, for example, in WO 00/17530, FIG. 1, which discloses an oil drain scoop, and US 5,864,963, which discloses a drain cylinder drain scoop. However, the problem with the catcher is its inefficiency, even a small error position causes the catcher not to swallow the oil fast enough or • »» ';;; 'Quantities that fill the roll and increase power consumption. Captors have become a bottleneck for oil drainage as oil collection and steering toward the inner surface of the shell has become more efficient: ·

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Especially with calender rolls, oil removal is problematic at high speeds because there is no space inside the roll to construct effective methods for removing hydraulic fluid.

Accordingly, it is an object of the present invention to provide a solution that allows the removal of hydraulic fluid from the inside of a roll in a relatively simple and at the same time efficient and cost-effective manner, in particular by replacing the capture solutions. In order to accomplish this object, the arrangement according to the invention is characterized by the elements set forth in the characterizing part of claim 11.

By removing the hydraulic fluid directly from the shell according to the invention, structures and ducts entering the shaft are avoided. There is room for other structures that are important for operations.

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The invention will now be described in more detail with reference to the accompanying drawing, the sole figure of which shows an embodiment of the arrangement according to the invention in a schematic partial view of the end region of the roll.

! '20 In the figure, 30 denotes a non-rotatable axis around which; the roller housing 1 is rotatable by means of bearing means 22. The roller housing is connected; ie a rotating end ring 10. Between the roll casing 1 and the shaft,

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j! Shaft-supported load elements 31 for loading the roll shroud

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in the direction of the nip to be formed with the tele (not shown). The pressurized oil is supplied to • • the load elements along the feed lines 32, which allow the oil to transfer: ·,. via capillaries 33 between the loading element and the roll shell. size to form a lubricating oil film thereon. In the illustrated embodiment, each load element has its own feed line 31, but the elements • (»* ;; can also be combined into groups of multiple elements so that each feed group is associated with a single feed line.) In the embodiment shown, hydraulic medium pressure line 23 long- · ·

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• »» 113887 3 kin. Roller bearings can also be used as bearings. Shaft 30 is provided with a non-rotatable housing seal 15 which is sealed against the end ring to collect the hydraulic fluid exiting the roll.

5 As the diaper rotates, the hydraulic fluid builds up on the inner surface of the diaper 1 by centrifugal force. The solution of the invention utilizes the pressure exerted by the centrifugal force on the hydraulic medium.

When the hydraulic medium is collected in the end areas of the jacket, the medium is carried down through the outlet ducts 5 and further through the end ring 10 down to the outlet duct 6 into the housing structure 15. 22 on one or both sides. The orifice 5a may also be located deeper within the roll 15, provided that a suitable space is left between the loading elements and there may be several orifices in the same outlet duct 5, as illustrated by way of example. The operation of the exhaust ducts 5 can be made more efficient by machining a circumferential groove on the inner surface of the sheath at the mouth openings 5a.

20: Outlet channels 5 have numerous tracks, 5-15, even more depending on%; ': Roll size and hydraulic fluid volume.

Preferably, the arrangement further comprises a labyrinth seal 12 and a leakage bore 21:25 to prevent fluid from entering the housing structure 15. Conventional sealing is more difficult to use because the sheath rotates and moves somewhat due to the bending of the i-axis and, moreover, the labyrinth seal is often more reliable than the touching seals. The labyrinth seals have no speed limit. In addition; ; : The arrangement includes genitalia to prevent debris and foreign matter from entering the • i: ': 30 enclosure while also preventing possible passage through the maze. external medium. In the embodiment shown, the closure member · '· [acts as a pneumatic seal 16 through which there is a continuous low flow of air at 113887 4 through connection 18. The area ratio on the air inlet and sealing sides of the seal 16 is fixed and the air flow keeps the seal slightly off the counter surface 17. The air flow is discharged on both sides of the seal 16, thus preventing debris and liquids from passing in either direction. For example, 5 such utility pneumatic seals are further described in Finnish Utility Model No. 4913. Instead of the compressed air seal 16, special bristles can also be used which prevent the passage of solid particles and at the same time break the air flow so that it is distributed on both sides.

10 The medium accumulating in the housing 15 can be discharged from the roll through the opening 20 and the outlet duct 24. The outlet duct must be sufficiently large that no pressure builds up in the housing 15. A small vacuum can also be provided in the housing structure. In addition, a breather 25 may be provided on the housing structure 15 if necessary.

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The solution according to the invention does not require collector structures inside the roll or compressed air inside the roll, and furthermore, the advantage is that the end sealing of the roll is easier to accomplish, since any leakage at the end is required. keräilykote-. and thus out of the roll without messing with the environment. Of course, the solution 20 according to the invention does not exclude the use of various known roller assembly or control structures or housings known per se to direct the oil to the end region.

1h »* '· * The structure according to the invention is preferably made on each of the roll ends, * · · ·' 25, whereby the cooling effect of the oil discharge bearing is the same at both ends.

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Claims (8)

1. Drainage arrangement for a bending-compensated roller hydraulic medium of a paper / cardboard or finishing machine, said roller having a stationary center shaft (30) and around said roller shaft (1) rotating with bearing means (22); hydraulic load elements (31) arranged between the center shaft (30) and the roller sheath (1); one connected to the roller sheath (1), with the rotating change (10); and an abutment-sealing abutment mounted on the shaft non-rotating mounting structure (15) for collecting the hydraulic medium, characterized in that the arrangement comprises at least one outlet channel (5) formed in one of the end regions of the roller in the roller sheath (5). ) for the hydraulic medium with Stminstone one orifice (5a) into the roller sheath; and, in the change (10), formed an outlet channel (6) opposite the said outlet channel (5) of the roller jacket, which outlet channel in its outlet end opens into the casing structure (15). 2. Arrangement according to claim 1, characterized in that the orifice (5a) of the outlet channel (5) is located adjacent the bearing member (22). : *. 20 Arrangement according to claim 1 or 2, characterized in that a maze seal (12) is arranged between the change (10) and the cap structure (15); : to prevent the medium from falling outside the jaw structure and a: pneumatic supplemental filter (16) to prevent extraneous foreign matter: ..: substances from entering the jaw structure. 25 - * ;;; 4. Arrangement according to any one of claims 1 to 3, characterized in that the bearing means (22) is a sliding bearing and that the outlet (5a) of the hydraulic medium is located (5a). in the axial direction of the roller in a position of • «» * ·; * one or both sides of the bearing member (22). 30 ”113887 5. Arrangement according to any of claims 1 to 3, characterized in that the bearing member (22) is a rolling bearing and that the outlet (5) of the hydraulic medium outlet (5) in the axial direction of the roller is located in a position within the bearing member. (22). 5 Arrangement according to any one of claims 1 to 5, characterized in that the orifice (5a) of the drain channel (5) in the axial direction of the drum is located in a position between the load elements (31). Arrangement according to any of the preceding claims, characterized in that the arrangement therefor has the internal control means of the drum for directing oil to said at least one end region of the drum. Arrangement according to any of the preceding claims, characterized in that the oil drain is arranged to be carried out via the bed ends of the roller. > · · * <»• · Il * • · · •» • ·> f • · • I