FI111395B - A method for replacing an intermediate roll in a multi roll roller - Google Patents

Description

A

111395

A method for replacing an intermediate roll in a multi roll roller

The invention relates, for example, to a method for replacing an intermediate roll in a multi-roll track according to the preamble of claim 1.

The invention also relates to a communication means according to the preamble of claim 3 for replacing an intermediate roll in a multi-roll track.

A multi-roll calendar track often includes up to 10-12 rolls arranged on top of each other in a substantially vertical roll stack up to 10 meters high. The track includes an upper roller and a lower roller, and a variable number of intermediate rolls, one or more of which are generally polymer coated. The overlapping rolls are arranged in nip contacts such that the fibrous web passes through the roll nipples of the roll. In the calendars used today, the bearing housings of the intermediate roller are fixed to the torsion arms, which can be subjected to the desired torque by hydraulic cylinders or similar actuators attached thereto. Torsional defects are pivotally mounted on the chassis of the track (calender-15in).

In order to successfully replace the roller track rollers, contact between the surfaces of the hot thermal rollers and the polymer coated intermediate rolls must be avoided during the lifting operation, since the polymer coated intermediate rollers are easily damaged from the surface. The intermediate rollers cannot be lifted directly from their position due to the rollers above. The rolls above 20 also make it impossible to insert the intermediate roll without additional equipment.

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Several methods have been developed for replacing the intermediate rollers of the track, most probably using separate lifting sleeves. These have been presented e.g. DE utility model 20001001, DE application publication 19904180 and DE application application 25 198 56 517. The problem with the lifting sleeves known from the above patent claims is that the shafts of the intermediate rollers have to be dimensioned for the load of the lifting sleeves, which easily results in an additional load. the fact that the shafts have to be made of expensive materials. In addition, lifting sleeves are often complex in construction and thus expensive. Separate lifting sleeves still have the problem that the intermediate roll, after removing the mounting screws between the shaft bearing housing and the torsion arm, remains unsupported and may contact the lower roll casing, which easily damages the polymer-coated rolls if one of the rolls is a heated thermal roll.

2, 111395

The object of the invention is to eliminate the disadvantages of the prior art. Accordingly, it is a first object of the invention to provide a method and a replacement means for replacing an intermediate roll in such a way that during any intermediate roll change operation, the intermediate roll cannot come into contact with the rolls above or below the respective roll. Another object of the invention is to provide a method and means for replacing an intermediate roll, wherein the replacing means no longer determines the material and dimensions of the shaft.

The invention relates, for example, to a method for replacing an intermediate roll in a multi roll roll system according to claim 1.

The invention also relates, for example, to a rolling member according to claim 3 for replacing an intermediate roll in a multi-roll track.

In the method according to the invention, the multi-roll track has a top roll and a bottom roll and at least two intermediate rolls are provided between them. When the first intermediate roll is removed from the roll, the first intermediate roll is lifted by the lifting means from the axes at each end 15 thereof. The lifting speed of the first intermediate roller is adjusted such that the first intermediate roller rolls away from the roller along the support surface of the rollers mounted on the torsion arms. Lifting of the first intermediate roll is continued until the lifting member is approximately vertical, wherein the first intermediate roll is replaced with the second intermediate roll. The second intermediate roll is lowered by the lifting member to its attachment point si-20 so that it is constantly supported by its axes on the support surface of the rolling members.

It is noted in this connection that the term first intermediate roll and second intermediate roll does not refer to the order of the rolls in the track. First intermediate roller means any track roller that is intended to be removed from the track, for maintenance, interim storage, transfer, or any other reason. The second spacer roll, in this case, refers to a new, refurbished, or similar roll, which is to be located in place of the spacer roll removed from the roll.

The roll change facilitating member of the invention is mounted on a torsion arm at each end of the intermediate roll, and the support surface of the scroll member is inclined upwardly at an angle determined by the point of attachment of the shaft to the support surface.

The basic idea of the invention is to provide the torsion arms used to compensate the mass of the intermediate roll with separate rolling members. These scrolling members, which control the passage of the intermediate roll to be taken out and introduced from the rack, have the advantage that the intermediate roll cannot, at any point during the changeover operation, touch the rolls above or below it. The support member of the scroll member inclines upwardly at an appropriate angle from the plane defined by the shaft mounting position of the intermediate roller 3 111395, thereby releasing the intermediate roll mounting screws on the supporting member of the rolling member, thereby providing the significant advantage of never lowering the lower roller.

5 The intermediate roll is lifted and lowered by a lifting device placed on the shafts at the ends of the roll, thereby obtaining the advantage over the prior art hoisting sleeves that the dimensioning of the hoisting equipment no longer determines the diameter of the intermediate roll shafts, causing a large torque.

In the following, the invention will be illustrated with reference to the accompanying figures.

Figure 1 shows an intermediate roll under which a lifting strap is mounted perpendicular to the end of the Telasonto.

Fig. 2 shows an intermediate roll raised to the front of the support surface of the rolling member as well as perpendicular to the end of the roller.

Fig. 1 shows two overlapping intermediate rolls 4 of a roll stack of a rack 3; 4 ', 4' ak-15 with selectors 4c; 4c ', 4c ". An axis 4c of each intermediate roll 4 is secured to a bearing housing 4b having a web guide 4d. The torsion arms 2 of the intermediate rolls are fixedly or releasably secured to the fastening edge 6 of the rolling element 1 by means of the screws used. The torsion arms are pivotally mounted to the body of the track 3 (not shown in the figure) at 2a. The side-20 profile of the portion of the scroll member 1 facing the shafts at the ends of the intermediate roll is a J-shaped horizontal position with the upwardly curved portion 1a of the J. The upper surface Ib 'of the horizontal spindle Ib of the J side sidewall profile now forms the supporting surface of the rolling member 1, along which the axes at the ends of the intermediate roll are moved during lifting and lowering of the intermediate roll during roll replacement. The supporting surface Ib 'is directed at a suitable angle a away from the track body. Angle a marks-25 see here axis 4; 4c is the angle between a horizontal line P drawn through the lowest point and a particular point on the support surface Ib '. Because the support surface is not quite straight, a ... is different at each point of the support surface. The angle α in the figure is the angle between the line P and the bearing surface Ib at approximately the axis attachment point B, i.e., the lowest point of the bearing surface. The angle α is such that the support surface Ib; Ib 'at a particular point and upper roll shell 4a; The distance between the lowest point 4a "is always greater than the distance between the lowest point of the lower roll axis 4c; 4c 'and the upper point of the upper surface of its shell 4; 4'.

: Lower intermediate roll 4; 4 'of axis 4; A lifting belt 5 is provided underneath 4c for lifting said spacer. The lifting belt 5 passes through the bearing housing 4c of said intermediate roll; 4c 'through the guide 4d and its upper part is secured to the crane (not shown in the figure). In the initial lifting phase shown in Fig. 1, the lifting device is inclined obliquely by the upper intermediate roll 4; 4 "front of shaft 4c".

The structure of the intermediate rollers shown in Figure 2 is the same as that of Figure 1. In the situation shown in Figure 5, the lifting process of the intermediate roll is advanced to such an extent that the intermediate roll is located in front of the supporting surface Ib '.

In the following, the replacement of the intermediate roller 4 will be discussed on the basis of Figs. When it is desired to replace the intermediate roll 4, the lifting belt 5 is fitted to the axes 4 at the ends of the intermediate roll; 4c as shown in Figure 1. The intermediate fastening screws 7 of the intermediate roll bearing housing 4b and the torsion arm 10 are loosened, leaving the intermediate roll remaining on the lifting belt 5 and the rolling surface support surface Ib; Ib 'can afford it. The bearing surface Ib 'tilts upward at an angle α, so that the intermediate roller does not accidentally go down. As the intermediate roller is lifted from the lifting straps 5 by the crane, the pressure exerted upwardly on the support surfaces of the intermediate roller shafts gradually decreases and eventually the intermediate roll 4 begins to move along the supporting surfaces Ib; Ib 'along its axes 4; 15 4c on it. The intermediate roll 4 moves away from the calender body of the axes 4 at the ends of the roll; 4c thanks to the 5 slanting positions of the lifting straps. The movement of the intermediate roll away from the track is controlled by the angle α of the bearing surface. Because the angle α is such that the support surface Ib of the lower intermediate roller rolling member 1; Ib and upper intermediate roll 4; 4 the distance between the lowest point of the 'jacket 4a' and the lower intermediate roll 4 being constantly greater than 20; 4 'to shaft 4c' is the distance between the lowest point A and the upper surface of its shell 4a 'upper surface, not the lower intermediate roll 4; 4 'the sheath 4a' will never come into contact with the upper intermediate roll 4; 4 "diapers 4a". The axes of the intermediate roll remain in contact with the support surface until the lifting belt 5 is vertical, whereby the intermediate roll can be replaced with another intermediate roll. In turn, when the second intermediate roll 4 is lowered back between the rolls of the track 3, it is first brought into the position shown in Fig. 2, in which the lifting straps 5 are vertical. The intermediate roller is allowed to descend to the support surface 1; Ib to curved portion 1 of the kid; la where it is secured by means of fastening means 7 to the torsion arm. The lifting straps are obliquely facing the rollers during lowering; to control roll roll.

Only one embodiment of the method according to the invention and the rolling member used therein is described above, and it will be apparent to one skilled in the art that the invention can be implemented in many other ways within the scope of the inventive idea set forth in the claims. Thus, the scroll member is fixedly or detachably attached to the torsion arm used as the roll attachment member. If the scroll member is removably attached to the torsion arm 35, the torsion arm is mounted directly to the bearing housing of the intermediate roller. From the viewpoint of the speed of interleaving, it is preferable to fasten the rolling element to the torsion arm, usually using the mounting method used in the above embodiment of the invention, in which the shaft housing of the intermediate roll is fixed to the rolling element.

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Claims (5)

111395 έ A method for replacing an intermediate roll (4) in a multi-roll track (3) having an upper roll and a lower roll with at least two intermediate rolls (4), characterized in that the first intermediate roll (4) is removed from the track (3) roll with the lifting means (5) of the axes (4; 4c) at each end thereof, - adjusting the lifting speed of the first intermediate roll so that the first intermediate roll (4) rolls away from the roll along the support surface (Ib) of the rolling members (1), until the lifting member (5) is approximately vertical, wherein the first intermediate roll is replaced with the second intermediate roll, - the second intermediate roll is lowered by the lifting member (5) to its attachment point so that it is constantly supported by its axes on the supporting surface (Ib). 2. Förfarande enligt patentkrav 1, kännetecknat av att lyftorganet (5) loper ge-nom lyftorgansstyrdon (4d) i mellanvalsens lagerhus (4b) och är vid päbörjande av 15 lyftningen av mellanvalsen i sned tips i förhällande account den av 3 -fmierade vertikalriktningen. Method according to claim 1, characterized in that the lifting means (5) passes through the lifting means guides (4d) in the bearing housings (4b) of the intermediate roll (4) and 15 are inclined at an angle to the vertical direction of the roll stack defined by the rolls. 3. Rullorgan (1) för att byta ut en mellanvals i en valsuppsättning (3) med en övre Vals och en undre Vals och mellan dem minvle mellanvalsar (4), kännetecknat av att 20. rullorganet (1) är fäst vid i mellanvalsens (4) bända ändar befintliga valsfästorgan (2), - rullorganens stödyta (1; Ib) sluttar uppät i en vincel (a) frän det av axelns fästpunkt (B) defmierade planet pästödytan (Ib). Rolling member (1) for replacing an intermediate roll in a multi-roll roller (3) having an upper roller and a lower roller and having at least two intermediate rollers (4) between them, characterized in that the 20 roller element (1) to the mounting means (2). - the support surface (1; Ib) of the rolling member is inclined upwardly at an angle (a) from the plane defined by the shaft attachment point (B) on the support surface (Ib). Rolling member (1) according to Claim 3, characterized in that it has a J-shaped side profile 25. Rolling member (1) according to claim 4, characterized in that the distance between the support surface (Ib; Ib ') of the cam and the roll (4c; 4c ") of the roll (4; 4") above the intermediate roll (4; 4'). is greater than the distance between the intermediate roller over the entire support surface (Ib); from the lowest point (A) of the shaft (4c; 4c ') to the lowest point of the intermediate roll shell (4c; 4c'). 111395, 1. Förfarande för att byta ut en mellanvals (4) i en valsuppsättning (3) med flera valsar innefattande en övre Vals och en undre vals och mellan dem minst tv-mel-lanvalsar (4), kännetecknat av att 5. da den första mellanvalsen (4) avlägsnas frän valsuppsättningen (3) lyfts den första mellanvalsen med et lyftorgan (5) vid axlar (4; 4c) i dess vardera ände, - lyfthastigheten första mellanvalsen regleras ä, att den första mellan ) rullar bortät frän valsuppsättningen längs stödytan (Ib) main rullorgan (1), - lyftandet av den första mellanvalsen (4) fortsätts till lyftorganet (5) är ungefär 10 lodrätt, varvid den första mellanvalsen utbyts den enananan sänks stöttad av lyftorganet (5) till sin fästpunkt ä att den den hela tiden vid you axlar stöder mot rullorganens (1) stödyta (Ib). 4. Rullorgan (1) enigt patent krav 3, rotation technique for detecting an account of sin sido-25 profile J-formigt gap. 5. Rullorgan (1) is a patent (4; 4 ') and anchoring (Ib; Ib') and piston (4c; 4c ") and a valve (4; 4") is ovanför mellanvalsen (4; 4 '). stödytans (Ib) länd större än distansen frän det close the stand (A) at the mellanvalsens Axel (4c; 4c ') account det close the stand at the mellanvalsens mantle (4c; 4c').