FI111983B - Press roll and method - Google Patents

Description

111983

Press roll and method - Pressvals och förfarande

The present invention relates to a press roll having end pieces and their support means, and an elongated cavity jacket and a method for repairing or renewing a roll / roll surface (paper) in a pulp drying or similar device.

Various roller structures are used in many different equipment in the paper and pulp industry. As machine sizes increase, roller structures continue to grow and weight increases. The installation of new equipment in existing facilities may not always be successful due to the heavy weight of the roll equipment of the new equipment, the lifting equipment of existing plants simply is not sufficient to lift and move such large roll structures. Thus, it is also necessary to replace the lifting machines, which can also be problematic, the load-bearing structures may not be able to withstand the father-15 load, which also requires structural engineering measures.

From time to time, the surface of the rollers also needs to be replaced or repaired. In this case, the roll assembly has to be moved from a paper or pulp machine, which can be very abrasive, and also in order to be able to require the above operations.

* 20> * * · · * ·> ·. The problem situation described above occurs especially in the case of large and heavy machine rolls, especially so-called. Shoe Press SymBelt ™ Roller * ·. *. ·. the counter roll is like that. The shoe press can be used e.g. pulp dryer • »: 1: as the 3rd press of the machine. The shoe press typically comprises a SymBelt ™ roller, 25 counter rollers, and a load connection.

* * ·

The SymBelt ™ roller is a shoe roller that provides a nipple longer than a normal roller nipple. The main parts of the SymBelt ™ roller are static * * *. ·. girder beam and associated load shoe assembly, shaft necks, • · * I · *, 30 pivot bearings and bearing housings, rotatably fitted ends and bearings. to be connected so-called. Belt fasteners, and the tubular cast itself.

2, 111983

The counter roll is, for example, a fixed-shell press roll which acts as a shoe roll counter roll. The main parts of the counter roll include a rotatably arranged jacket, ends and shafts with bearing arrangements.

5 The line nip of the long nip press is carried by a separate load connection between the SymBelt ™ roller and the counter roller bearing housings. The joint is designed to be easily opened by a manual turning device or hydraulic cylinders during maintenance work.

10 Changing the shoe press rolls by prior art is as follows. According to the prior art, the counter roller is first replaced by a bridge crane and lifting belts by first removing it from the machine frame. You do not even need to replace the SymBelt ™ roller itself, as you only need to replace the thrower, for example. The counter roll is often so heavy that especially the so-called roller. At the same time, the rebuilding projects will also require the rebuilding of the mill's data center bridge crane and, possibly, the constructional reinforcement of the building's foundations. handling the counter roll with a bridge crane would be possible. This will significantly increase investment costs and in some cases may be almost impossible.

20

Thus, the present invention is intended to overcome the drawbacks of the prior art: and to provide a solution that achieves significant financial savings.

In some cases, the solution of the invention can save up to millions of marks.

In order to avoid these drawbacks, the invention proposes a solution in which the end portions of the roll are detachably connected to the roll casing and that at least one of its ends and its support means are movable. Preferably, the end piece comprises a shaft pin and a flange having a center region and an edge region: 30 having a central diameter so much smaller than the inner diameter of the shell that said center region can be accommodated in the cavity space of the shell by the | · Pressing against the end faces of the jacket.

3, 111983

For ease of fitting, the lateral surfaces of the central region of the diaper may be bevelled, wherein the respective end surfaces of the diaper are likewise shaped oblique.

In order to facilitate the removal of the end piece, the annular surfaces of the end piece and / or the respective bevelled surfaces of the ends of the diaper 5 are preferably provided with a circumferential annular groove for the pressure medium.

Alternatively, the release may in some cases be effected by the release screws, which are pushed apart by the screws when the cover and end piece 10 are screwed apart.

According to the invention, the roll assembly can be further divided into a housing part and end pieces when the machine is in the machine. This results in a much lighter structure that can be easily lifted, generally having a weight ratio of the sheath 15 to the end faces of the order of 1: 1.

In most cases, the solution of the invention allows the parts to be lifted with current lifting equipment, and overall the handling of the assembly is considerably simpler.

20

The invention also relates to a method for changing or installing a roll, in particular a shoe press counter roll, in pulp drying or similar machines. According to the invention, the roll is preferably mounted on the machine such that, when the press member frame structures are substantially stationary, are mounted '; 25 counter roll end pieces with support devices. In accordance with the invention, the end pieces and the press body with the mating surfaces of the end pieces are arranged such that,. that it is possible to move the end pieces in the transverse direction of the machine (in the direction of the axis of the counter roll) with respect to at least one end piece, so that the end pieces remain supported by the body. The end pieces are fitted in place; 30 so that the distance between them allows the roll sheath to be inserted between the roll ...: end pieces where the sheath is secured to the end pieces and these ·: · continue to fit properly into the press body.

• · 4 111983

Accordingly, according to the invention, the removal of the counter roll for service or the like from the machine is performed as follows. According to the invention, the machine body and the roll end pieces comprise an arrangement in which either one or both roll end pieces can be displaced sideways 5 (in the axis of the roll) of the machine. According to the invention, the jacket of the counter roll is supported by a crane (which therefore needs to support substantially only the mass of the jacket), and at this point at least one end member while being detached from the jacket is further displaced axially relative to the roll end and lift off. Alternatively, both end caps may be displaced supported by the body of the press member axially relative to the roll while being removed from the shell. This keeps the end pieces supported by the frame in the machine and the jacket can be lifted off.

The arrangement according to the invention, whereby one or both roll end pieces can be moved in the transverse direction of the machine, preferably comprises in the frame structure , 20 long hole or similar).

The invention will be described in more detail with reference to the accompanying drawings, in which: * Fig. 1 shows a press section of a pulp drying machine, and • · · 25 'Fig. 2 illustrates a principle structure according to the invention; end application of another application.

* ·· Figure 1 schematically illustrates one embodiment of a pulp fiber: ··; press part of the whipping machine: a combi press wherein the wire section is shown by reference numeral 10, 11 represents a first upper felt and 12 first lower felt, 5111983, and a subsequent shoe press wherein 13 represents a second upper felt, 14 represents a second lower felt. The roll counter surface is shown at 5 and the frame structure at 6. Here, the SymBelt ™ shoe press roll is a lower roll, but the counter roll may also be a lower roll. The arrangement according to the invention can advantageously be used in connection with a counter roll and its frame structure. The frame and the roll end pieces comprise an arrangement on their attachment surfaces that one or both roll end pieces may be displaced sideways in the transverse direction of the machine. Preferably, the frame structure has a longer (in the cross machine direction) mounting contact surface than the end of the roll 10 in the structure. The body and the end piece further comprise a fastening arrangement that allows the end structure to be displaced (e.g., T-groove, long hole, or the like). This is illustrated in more detail in Figure 2.

Figure 2 is a side elevational view of a basic arrangement in which end portions 1 and 2 with supporting means are provided on both sides of roll 3 (shortened). In the figure, the sheath 3 is detached from its ends 1,2, which are shown for forward and backward displacement in the longitudinal direction of the roll. Otherwise, the sheath and end structures may be quite conventional. The ends 1 and 2 are removably attached to the sheath 3 by means of fastening devices known per se.

20 | The device is mounted by first installing the end pieces 1, 2 on the support means. At least one of these ends and its support means is displaced so far that the distance of the end pieces 1,2 is greater than the length of the roll 3.

The roller sheath is inserted by a crane and inserted between the end pieces and secured to the other end piece. The second end piece 2 '' 'is then moved onto the roll shell 3 and the end piece 2 is secured to the roll shell while the end piece 2 with its support means is locked into the base.

'\ Of course, it is possible to carry out the installation so that both support ends 1 and: 30 2 with their support devices are movable.

Fig. 3 shows a detail of a roll structure according to the invention, wherein: a roll-shaped member 2 is mounted at the end of the roll casing 3 with a central region projecting into the inner part of the hollow roll, thereby pressing against the end face of the roll. The edge-wrapped end piece 2 is fixed to the roll by conventional fastening devices, bolts or the like known per se.

In order to facilitate the removal of the end piece 2, the tile member 2 is provided with release screws 7 which can be unscrewed by rotating the tile.

Figure 4 shows another preferred embodiment for removing the slab 2. In this case, the inner end surface of the roll shell 3 and the corresponding side surface of the end piece 2 are oblique, whereby the shape of the piece 2 is a truncated cone. This surface of the cone-10 is provided with a circumferential annular groove 4 which is connectable to the pressure medium source 8. When the release members are removed from the groove 4, a pressure medium can be supplied, whereby the end 2 is easily released from contact. The pressure medium may be hydraulic or pneumatic.

Of course, the release screws 7 according to Figure 3 can also be applied to the roller head structure shown in Figure 4.

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Claims (11)

A cellulose dryer machine or equivalent press portion comprising at least one roll pair forming a press nip, the rollers of which at least one comprises at least one end pieces (1, 2) and a sheath portion (3) or equivalent between them and a body structure (6). for the press, with which the body structure is properly supported, and the body part (6) and at least one end piece (1,2) comprises supporting and abutment surfaces (5) which are in contact with each other since the roller is fixed to the body structure (6), characterized in that the support and shoulder surfaces (5) comprise an arrangement (5 ') to enable at least one axial movement of the end piece relative to the body and at the same time support the release of the mantle of the roller from the end pieces (1,2) since the roller is in the machine and, in addition, the body (6) and the end piece (1,2) include a fastening arrangement; which enables the movement of the end structure. Pressing portion according to claim 1, characterized in that there is preferably in the frame structure (6) a longer (in the transverse direction of the machine) attachment surface (5 ') than in the end structure of the roll. Press section according to claim 1 or 2, characterized in that the fastening arrangement is a T-bar, a long shark or the equivalent. I ·. ·. ·. 25 4. Press section according to claim 3, characterized in that the fastening arrangement. : ·. it is formed by a conductor, an elongated shark or equivalent. ; V. 5. A method for loosening the roll of a cellulose dryer machine or the corresponding pressing portion from the machine, for example for service or the like, characterized by at least the following steps: • · · - either one or both of the roll end pieces (1,2) is moved in the machine's •: * · transverse direction (in the direction of the roller shaft), ·: ··; - the mantle (3) of the roller is supported by a lifting crane, and - at least one end piece (1,2) at the same time as it is detached from the male end adhering to the roller said that the male end (3) can be detached from the other end end piece (1, 2) and lifted off. Method according to Claim 5, characterized in that the 5-bath end pieces (1,2) in relation to the roll (1-3) are moved axially supported by the body of the pressing part while being released from the men (3), wherein the end pieces (1, 2) remains in the machine supported by the frame and the manifold (3) can be lifted off. 7. The press roll (1 - 3) of the cellulose dryer machine or press section comprises eating at least end pieces (1, 2) and a sheath portion (3) or the like between them and a body structure (6) for a press, with which the body structure and the press section and its components are properly supported, characterized in that the body structure (6) and at least one end piece (1,2) comprise support and abutment surfaces (5) which are in contact with each other where the roller is fixed to the body structure (6) and which comprises an arrangement (5 ') for enabling at least one axial movement of the end piece relative to the body, and at the same time supporting to complete the release of the mantle from the end pieces (1, 2) where the roller is in the machine and, the body 20 (6) and the end piece (1,2) further comprise a fastening arrangement which allows movement of the end structure. > · · · · Pressing roller according to claim 7, characterized in that in the body structure (6) there is preferably a longer (in the transverse direction of the machine) mounting impact surface: Y: 25 (5 ') than in the end construction of the roller. I · · ♦ # »• · · Pressing roller according to claim 8, characterized in that the fastening arrangement: '1 · 1' is a T-bar, a long heel or the like. • · · · • • I • · · .. · 30 Pressing roller according to claim 9, characterized in that the fastening arrangement is formed by a conductor, an elongated heel or the like. • · * 1 1 1 »1 ♦ *»