FI65462C - VAEXELANORDNING FOER KALANDERVALSAR SPECIELLT FOER ON-MACHINE SUPERKALANDRAR - Google Patents

Description

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Patent and regiaterstyreiaen v 'AmMoii utiiri och utUkrKun pubiktnd 31.01.8U

(32) (33) (31) Requested * import »—Begird prierttet (Tl) Valmet Oy, Punanotkonkatu 2, 00130 Helsinki 13, Finland-Finland (FI) (72) Veikko Leiviskä, Porvoo, Finland-Finland ) (7U) Forssen & Salomaa Oy (5U) Calender roll changer, especially for on-machine supercalenders -Växelanordning för kalandervalsar, speciellt för on-machine super-kalandrar

The invention relates to an exchange device for calender rolls, in particular for on-machine super calenders, which exchange device comprises a body part and gripping members.

One finishing step of the paper is the calendering of the paper, which mainly affects the smoothness and gloss of the paper surface as well as the density of the paper. The calendering takes place by passing the continuous paper web further through the pressing or nip points between the calender rolls acting against each other.

As is already known, the calendering of paper takes place by means of a so-called with a machine calender, which treatment is supplemented, if necessary, in a separate so-called by supercalendering performed in a supercalender.

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The rollers used in calendars are either hard rolls or soft rolls.

Hard rolls in this context refer to rollers whose material is, for example, die-casting or steel and whose hard surface is smoothly ground.

Soft rolls, on the other hand, hereinafter mean rollers with a surface of flexible material. Paper is commonly used as a flexible material for soft rolls, the layers of which are stacked around the axis of the roll and pressed into a uniform dense roll coating.

In order to increase the efficiency of production in paper production, the so-called on-machine supercalenders that are placed to operate in conjunction with a paper machine. For these calendars, reference is made to the applicant's previous FI patent applications Nos. 801665, 801666 and 801853.

As stated, the soft rolls used in the supercalender are rapidly abrasive and often damaged. On the other hand, because the profitability of on-machine supercalender investment compared to traditional supercalenders depends crucially on how little the paper machine's production efficiency decreases due to the on-machine supercalender placed behind it, it is paramount to minimize downtime during roll change, especially soft rolls. The main object of the present invention is to provide a device with which the length of calendar production interruptions can be minimized.

It is a further object of the invention to provide a device by means of which a calender roll, in most cases a damaged soft roll, can be replaced during production.

In order to achieve the above objects, the invention is essentially characterized in that the exchange device consists of a carriage comprising rollers, wheels or the like on which the carriage can be moved to a calendar, in particular an onmachine supercalender, interchangeable calender rolls and further comprises devices with its gripping members. movable to a position where they adhere to the bearing brackets or the like of the calender roll, in particular the soft plate calender roll.

In the following, the invention will be described in detail with reference to some application examples of the invention shown in the figures of the accompanying drawing, to which the invention is not limited.

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Figure 1 shows a calender roll change carriage according to the invention in a partially sectioned view in a direction transverse to the direction of travel of the web.

Figure 2 shows the same as Figure 1 as seen from the direction of web travel.

Figure 3 shows the exchange carriage of Figures 1 and 2 in its operative position inside an on-machine supercalender.

Figure 4 shows another variant of the invention in its operating position within the calendar.

Figure 5 shows another variant of the gripping devices of the swap car according to the invention.

Figure 6 shows a third variant of the gripping devices of the swap car according to the invention.

The trolley shown in the figures comprises a body part 3, which according to Fig. 2 consists of vertical frames 3a and 3b and horizontal frames 3c and 3d connecting them. The width L of the frame is substantially equal to the width of the calendar (Fig. 3). When viewed from the side, the body 3 is shaped to fit in the space between the adjacent calender roll groups R 1 and R 2 attached to the calendar, in particular the on-machine supercalender, as shown in FIG.

The trolley 100 moves on rails 14 transverse to the paper machine on rollers 2. There are, for example, four or more rollers 2 and they are driven, for example, by a gear motor 1.

The trolley 100 shown in Figures 1 and 3 further comprises an inner body 5 supported by rollers 6 for vertical movement. The inner body 3 is moved vertically by means of a lifting cylinder 4. There are two inner frames 5 in the exchange carriage 100, one inside each frame 3a and 3b. Likewise, in Fig. 1 there are other parts two inside the frames 3a and 3b. In connection with both frames 3a and 3b, there are also double-sided gripping members 9a and 9b fixed to the arms 8a, 8b, which move under the action of the cylinders 10 horizontally on the support rollers 7. The arms 8a, 8b have grooves 16 in connection with which the gripping rollers 7 rest. At the upper edge of the gripping members 9a, 9b there are gripping stops 21 for gripping the notches 22 of the bearing housings of the interchangeable calender rolls, as will be described in more detail later.

Figure 3 shows an exchange carriage 100 according to the invention for operation in connection with a certain type of on-machine supercalender. It should be emphasized, however, that the exchange carriage 100 of the invention is suitable for use with on-machine supercalenders other than those shown in Figure 3.

Regarding the structure of the calendar shown in Fig. 3, it should be briefly noted that it has two vertical frames 110,111, between which the exchange carriage 100 operates in the free, reserved space T. The calender has draw nips Dj and D1 formed by hard rollers. The web W will be presented by the calendar, see the arrow and the arrow leaving the point made by W _. The calender has three groups of calender rolls. According to Figure 3, the group Rj is in reserve as the web passes only through the nips A and B formed by the roll groups R2 »R2 and the tensile nips Dj and D2. According to Fig. 3, e.g. the roll 15 of the roll group Rj is damaged and is currently being replaced by the roll change carriage 100. A more detailed embodiment of this roll change will be described below.

The carriage 100 is driven along the rails IA by means of the gear motor 1 and the rollers 2 inside the calendar, or the carriage 100 is ready there waiting. The damaged calender roll 15 is lowered by means of the cylinder 13 with the nip A open, after which the gripping members 9a of the roll are driven into the bearing housings 11 at both ends so that the gripping response 21 of the gripping member 9a * goes into the notch 22 in the bearing housing. that the cylinder A is used to move the entire inner body 5 vertically. In this case, the gripping member 9 of the roll also moves up and down.

The bearing housings 11 of the calender roll 15 are detached from the body 12 and the roll is lifted by the cylinders A so that it is fully supported by the exchange carriage 100.

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The carriage 100 and the detached, damaged roll 15 are driven by a dental flare motor 1 and rollers 2 from inside the calendar to the treatment corridor, after which the roll 15 is lifted off the carriage by a crane. The new roll is brought by a crane to the carriage 100, which is driven with the new roll inside the calendar. Thereafter, by means of the cylinders 4 and 10, the new roll is moved into place on the calendar body 12 and the bearing housings 11 are fixed in place. The roller suspension devices 9a are now driven out of the bearing housings 11 by means of cylinders 4 and 10.

Figure 4 shows a variant of the roller carriage 100 according to the invention. According to Figure 4, the exchange carriage 100 comprises two overlapping, independently operating inner bodies 5a and 5b, each of which has its own lifting cylinder 4a, respectively 4b. In addition, the gripping members 9a and 9b consist of two separate operating units, each of which has its own transfer cylinder 10a, respectively 10b. According to Fig. 4, the gripping members 9aM 'are gripping the bearing supports 11 of the roll 15. The other lower gripping members 9a "are in the off position. The upper gripping members 9b' are also in the inoperative state.

Figures 5 and 6 show some variants of the gripping devices of the roll change carriage. According to Fig. 5, the gripping members 9 'have a gripping stop 21 as described above and the bearing bracket 11 has corresponding grooves 22. In addition, gripping at the lower edge of the gripping members 9' is secured by screws 17 or other similar locking pins so that there is no risk of the roller 15 detaching 9 * and 100 wagon support.

According to Fig. 6, the gripping members 9 "have a substantially U-shaped gripping part with a protrusion 18 above and a protrusion 23 below, which fits over the correspondingly shaped parts of the sides of the bearing brackets 11. The gripping is provided by pins 19 which fit in the protrusion 18 and the bearing bracket. The gripping members 9 'and 9 "and the sides of the bearing brackets 11 have, preferably planar, surfaces 24 which come into contact when the bearing brackets 11 of the replaceable roll 15 are supported by the gripping members 9 of the carriage 100.

Using the variations of the invention shown in Figures 4,5 and 6, the replacement of the damaged roll, in particular the soft calender roll, is carried out in substantially the same manner as described above in connection with the embodiment of the invention according to Figures 1, 2 and 3.

The following are claims within the scope of which the various details of the invention may vary within the scope of the inventive idea.

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Claims (10)

Apparatus for changing calender rolls, in particular for on-machine super-calender, said gear unit comprising a body part (3,5) and gripping means (9, 21), characterized in that the gear unit consists of a carriage (100) which comprises rollers (2), wheels or the like, on which the carriage (100) can be pushed into a calender, in particular an on-machine super-calender for the calender rolls (15) to be replaced and the carriage (100) further comprises devices by means of which its gripping means (9, 21) can be displaced to such a position where they engage gripper holders (11) or the like for a calender roll, in particular a soft surface calender roll (15). Gear unit according to claim 1, characterized in that the body part (3) of the device, seen in the transverse direction in relation to the running direction of the web, has the shape of a lower turned T and comprises an upper part which is narrower than a lower part, the gripping means (9). ) are arranged on one or each side of the upper part. Gear unit according to Claim 1 or 2, characterized in that the gear unit is arranged to move into the calender and out of the same in the forward direction of the web (W) to be calendered transverse rails (IA). Transmission device according to claim 1,2 or 3, characterized in that it comprises, seen in the running direction of the web to be calendered, two adjacent vertical frames (3a, 3b) and rectangular bodies (3c, 3d) joining them (Figure 2). Transmission device according to Claim 4, characterized in that inner bodies (5) are arranged to move in a vertical direction within said vertical bodies (3a, 3b) on rollers (6) or the like by means of force devices (4). and that gripping means (9a, 9b) are connected to said inner bodies (5; 5a, 5b) to move in a substantially horizontal direction through the action of force devices (10). A gear assembly according to claim 5, characterized in that the gripping means are comprised of arms (8a, 8b) which are arranged to move