FI111394B - A method for replacing an intermediate roll - Google Patents

Description

111394

A method for replacing an intermediate roll

The invention relates, for example, to a method for changing the intermediate roll according to the preamble of claim 1.

The invention also relates to a control means for changing the intermediate roll, for example according to the preamble of claim 4.

The roll of a multi-roll calender often comprises up to 10-12 rolls arranged on top of each other in a substantially vertical roll stack of up to 10 meters in height. The track includes an upper roller and a lower roller, and a variable number of spacer 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 presently used multi-roll calendars, the bearings of the intermediate roll bearings are mounted on torsion arms, which can be subjected to the desired torsional force by means of hydraulic cylinders or similar actuators attached thereto. The torsion arms used to compensate for the mass of the intermediate rollers are hinged to the track body (calender).

Several methods have been developed to replace intermediate rollers on the track, the most common being the use of separate cranes and lifting sleeves. These have been presented e.g. In DE utility model 20001001, DE application publication 19904180 and DE application publication 198 56 517. One of the major problems with the use of lifting sleeves 20 has been that when changing the intermediate roller, there must be an observer at each end of the intermediate roller to fit the lifting sleeves to the shafts. If observers are needed on the Hoi bridge while changing the intermediate roll, occupational safety is poor because there is always a risk of the intermediate roll falling.

The lifting sleeve is a lifting aid between the crane hook and roller. In the crane hook 25, the suspended lifting sleeve is pushed in the direction of the longitudinal axis of the roll so that the roll shaft protrudes into the hole in the lifting sleeve. The lifting sleeve is locked into the groove of the roll shaft: mechanically to prevent the roll from slipping. The lifting sleeve thus forms a rigid structure with the roll so that the roll can be lifted by a lifting line which is substantially outside the roller structure. This refinement is necessary because the rollers above the roller 30 and other calender structures prevent the lifting line at the roller from being selected.

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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.

At worst, the overlapping rollers are only about 5 mm apart, so the on-5 gel may become large if the intermediate roll is not raised evenly during the exchange operation. The intermediate rollers cannot be lifted directly from their position due to the rollers above. The rollers above also make it impossible to insert the intermediate roll without additional equipment.

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 means for replacing an intermediate roll so that the intermediate roll cannot, at any point during the intermediate roll change operation, come into contact with the rolls above or below said roll. Another object of the invention is to prevent the intermediate roll from falling during roll change and to make roll change safer.

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 to a control means according to claim 4 for changing the intermediate roll in a multi-roll track.

In the method according to the invention, the multi-roll track has a top roll and a lower roll 20 and at least two intermediate rolls therebetween. In the method, the fastening means between the bearing housing of the first intermediate roll and the roll mounting member are opened and the locking means of the shaft guide means of the first intermediate roll are opened. The first intermediate roll is then moved down the guide channel passage to the mouth of the control channels, after which the first intermediate roll is replaced with the second intermediate roll. The second intermediate roll 25 is introduced into the roll by moving the intermediate roll axes down to the point of attachment along the guide channel of the guide means.

A: It is noted in this connection that the term first intermediate roll and second intermediate roll does not refer to the stiffness of the rolls in the track. The 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 intermediate roll, in this case, refers to a new, refurbished, or similar roll, which will be placed in place of the intermediate roll removed from the roll.

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The control means according to the invention has a fork part for guiding the axis of the intermediate roll and a locking element for locking the axis of the intermediate roll into the fork part. The centerline of the guide channel guide channel extends one distance from the rollers above and below the intermediate roll. The distance between the center line of the guide channel from the rolls above and below the intermediate roll is always greater than the shark ·: echo D of the cylindrical sheath portion of the intermediate roll.

By using the control means according to the invention for changing the intermediate roll, the intermediate roll cannot at any time touch the rolls above or below the intermediate roll during the switching operation, since when the intermediate roll is removed from the guide means its axes are transported along the guide means. The distance between the center line P of a given intermediate roll guide channel and the center lines of the intermediate roll guide channels upstream and downstream of the intermediate roll is always greater than the diameter D. The guide channel between the upper and lower arms of the fork member

The fork part of the control device according to the invention has a locking member which prevents the roll from falling off the fork in the event of a fault, e.g., when the roll fixing screw is removed and people are still in the danger zone (installers having to work on the lifting platform 20).

Further Advantages of the Invention It will be noted that the mechanism for opening the locking means of the control means can be arranged to be very simple; the latching means of each of the intermediate rollers of the track can be opened simultaneously because only one intermediate roll is replaced at a time, so that the securing screws between the other intermediate rolls and their roll fastening members are still secured, thus preventing the other intermediate rolls from accidentally moving. Preferably, the center line of the guide channel is directed downward from the plane of the roll attachment point by the guide means. In this case, the spacer roller slides downwardly along the passage of the guide channel when removed, which facilitates moving the spacer roller away from the roller.

In the following, the invention will be described in more detail with reference to the accompanying figures.

Fig. 1A shows the intermediate roll, viewed directly at the end, with the intermediate roll shaft housing and the torsion arm mounting screws open.

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Fig. 1B shows the intermediate roll of Fig. 1 as moved to the mouth of the fork portion of the guide means.

Fig. 2 shows a lower roll of a multi-roll track as well as two spacer rolls on top of it looking directly at the end of the track.

1A and 1B show a spacer roll 4 with a guide means 1 according to the invention, with an axis 42, as viewed directly at the end of the spacer roll. In the following, the structure of the control means will be considered on the basis of Figure 1A.

The guide means 1 has a fork portion 2 and a locking or latch member 3 in a locked position. The fork portion 2 has an elongated upper arm 21. The rear portion 21a 10 of the upper arm 21 narrows slightly, its front 21b being strongly tapered as it moves away from the roll attachment. The elongated lower arm 22 is a mirror image of the upper arm; its rear portion 22a is slightly tapered as the front portion 21b is heavily tapered. Between the upper and lower rear portions 21a, 22a there is an arm connecting housing 23 which is curved in shape and whose radius of curvature of the inner surface 15 corresponds approximately to the axis 4 of the roll; 42 radii of curvature. The guide channel 7 for controlling the movements of the roll shaft 42 is thus left between the upper and lower arms of the fork member 2 and the diameter d of the guide member 7 is in the guide channel groove 7 on the side of the fork member 23; 71 of the same order as the roll axis 4; 4 with diameter. Solan 7; 71 diameter d; dl increases slightly when moving toward the front of the fork section arms due to the fact that the rear of the lower and upper arms gradually narrows so that the distance of the inner surfaces of the rear section from the center line P of the fork section gradually increases. Upper and lower arms front 2; 21b, 22b narrower so that their inner surfaces distance from the center line P of the fork section increases sharply, forming a strongly opening mouth portion 72 of the guide channel 7 between the upper and lower arms. The midline 25 P passes one distance from the upper and lower arms 21, 22 and at the same time forms the center line of the control channel 7. The center line is downward from the plane defined by the roll attachment point by the guide means, which is more clearly illustrated in Figure 2.

• a fork part 2 for guiding the shafts of the intermediate roller and at the same time a slot 7; The centerline P of the 71 is 30 in such a direction that the diaper of the intermediate roll cannot contact the diapers of the rolls above and below the intermediate roll when the intermediate roll is removed from the roll or reintroduced into the roll.

The guide means 1 is attached to the end of the torsion arm 6 used to compensate the mass of the intermediate roll. The control means 1 has a fork part 2 as described above and a locking member 3 for a latch or 5 111394. The latch member 3 has a latch part 32 and a pressure member 33 for moving the latch part 33; 32a is pivotally mounted at its pivot point 32; 32b to a two-part shaft 31. The pressure member 33 has a helical spring 33b and a pneumatic cylinder 33a to which it is possible to supply compressed air. The first straight portion 3a of the pressure cylinder 5 of the biaxial shaft 31 is attached to the helical spring 33; 33b.

A second portion 31b of the shaft 31 on the latch portion is articulated with a first portion 3a of the shaft on the pressure cylinder, and at its end is pivotally mounted on the latch portion body 32; 32a. Coil spring spring force 33; 33b holds the latch member 32 in its locked position, i.e. the guide channel 7, even though the pneumatic cylinder 10 33; 33a would thus be derived primary air pressure.

In the situation shown in Fig. 1A, the spindle axis 4; The fastening screws between the bearing housing 42 (not shown) and the torsion arm 6 have been opened, whereby the latch member 3 is in the locking position with the latch member 32 inserted into the guide channel slot 7; 71. The locking or locking member 3 in its locking position prevents the intermediate roller shafts 4; 42 Bench Parts 2 in Bicycle Movement 15; 71, whereby the intermediate roll 4 cannot fall from the fork portion 2 of the guide means.

Also shown in Fig. 1A is a resultant force F having a roll axis 4; 42 aligns lower arm 2; 22 towards the inner surface 72 of the gorge 7. The position of the pivot point (- attachment point) 32 of the latch portion 32 of the lanyard 3 in the second portion 31 of the biaxial 20; At the 3 Ib end, it is plotted so that the direction of the resultant force F passes near the point of attachment of the latch member. The resultant force F then presses the body 32 of the latch member; 32a inward if the spindle axis 4; 42 can move in the fork portion before opening the latch member, which in turn causes the latch member to be locked further. This ensures that the shaft of the intermediate roller does not move past the locking member, even if it moves in the fork of the fork after removal of the clamping screws.

Fig. 1B shows the same intermediate roll control means as in Fig. 1, but now its latch member 3 has been opened. The latch member 3 is opened by supplying air to the pressure cylinder 33a of the pressure member 33 which causes the helical spring 33b to be compressed. The helical spring * · 30 33b, when compressed, pushes the first part 31a of the biaxial shaft 31 while causing the body 32 of the latch part to be pivotally attached to the end of the second part 3b of the biaxial shaft; 32a turning in the back of the lower arm.

It is possible to unlock the latch members of all track rollers at the same time, because • only one intermediate roll is replaced at a time. The fastening screws 35 of the other intermediate rollers are still attached and thus cannot accidentally move. Such a mechanism for opening the latch members of the intermediate rollers 6111394 greatly simplifies the control means for controlling the air supply to the control means in that each latch member is provided with its own air supply control. The supply of compressed air to unlock the latch portions of the latch members can be safely remotely controlled, for example by radio control, when there are no people in the vicinity of the track.

When the latch members 3 of the intermediate roll 4 are in their open position, the shafts 4 of the roll can be; 42 unobstructed movement of guide passages 7 between the arms of the fork members; 71 along the guide openings 7; 72, for example, by means of sleeves (not shown in the figure) attached to the shafts at their ends. Solo 7; 71 retracts the shaft 10 downwardly by the guide means, whereby the roll slides gravely against the opening 7 of the guide channel; 72. Kim's V-axis is at the mouths of the control channels, the V-V can be changed to another V-V.

When the other unit is introduced into the track, the latch member is held in the locked position by cutting off the air supply to the pressure cylinder. Shafts of Valtella 4; 42 threading guide channels 15 of guide channels 15; 71 along its attachment point by a guide means, the shafts of the latching elements being pushed by the shafts of the latch members 3; 32 open. When the shafts at the ends of the pins have passed the latch portions 3 of the latch members; 32, they automatically close, thereby preventing the vibrator from moving back towards the mouth of the control channel.

Fig. 2 illustrates the positioning of intermediate rolls with a control means 1 according to the invention in a calendar consisting of a multi-roll track 5.

Figure 2 shows the lowest roll of the multi-roll track 5 and the three oscillations above it. The rolls of the track 5 are arranged on top of each other in a substantially vertical roll stack. Lowest wavelet 4; 4 'and the highest pitch 4; 4 '' are polymer coated middle weft 4; 4 ”with a heated roller. The figure illustrates how the guide means 1; Γ and 1; 1 "and 1; F 'centerline of control channels P; P ', P' are summed so that the diapers of the overlapping spacers do not accidentally touch each other in the intermediate roll change operation. The distance S of the centerline P of a given clearance to the centerline of the clearance above and below the clearance is always greater than the diameter D of the cylindrical shell portion of the intermediate rolls.

The foregoing illustrates only one embodiment of the invention, and it will be apparent to one skilled in the art that the invention may be embodied in many other ways within the scope of the inventive idea set forth in the claims.

Claims (10)

111394 A method for replacing an intermediate roll (4) in a multi-roll track (5) having an upper roll and a lower roll with at least two intermediate rolls (4), characterized in that the fastening means between the bearing housing of the first intermediate roll and the roll mounting member (6) - the locking means (3) of the guiding means (1) of the shafts (4; 42) of the first intermediate roller are opened, - the first intermediate roller is moved down the guide channel slot (7; 71) to the mouths (7; 72) of the guide channels; one intermediate roller, - the second intermediate roller is introduced into the roller (5) by moving the intermediate roller shafts (4; 42) along the guide means guide channel (7) to its attachment point. Method according to Claim 1, characterized in that when the second intermediate roll 15 is brought back into the roller (5) the locking member (3) is in the locking position and when the intermediate roller shafts (4; 42) are locked by the control means (1). Method according to Claim 1 or 2, characterized in that the first intermediate roll (4) is moved along the channel (7; 71) of the guide channel by sliding it gravitationally down the channel or by moving it with a crane. Guide means (1) for changing the intermediate roll (4) in a multi-roll track (5) having a top roll and a lower roll with at least two intermediate rolls (4), characterized in that each guide means (1) has a fork portion (2) (4; 42) for controlling the 25. locking member (3) for locking the spindle shaft (4; 42) in the fork portion. Guide means (1) according to claim 4, characterized in that the fork part comprises upper and lower arms (2; 21, 22) between which a guide channel (7) is located. Control device (1) according to claim 5, characterized in that the center line (P) of the control channel (7) extends one distance from the rolls above and below the intermediate roll. 111394 g Guide means (1) according to claim 6, characterized in that the distance between the center line (P) of the guide channel and the rolls above and below the intermediate roll is always greater than the diameter D of the cylindrical casing part of the intermediate roll. Guide means (1) according to Claim 6, characterized in that the center line (5) and (P) are directed downwards from the plane of the roll attachment point by the guide means (2). Control device (8) according to one of Claims 4 to 6, characterized in that the locking means (3) of all intermediate rolls can be opened / closed simultaneously. Control device (8) according to one of Claims 4 to 9, characterized in that the locking means (3) of the control device can be opened / closed by a pressure cylinder (3; 10 33).