FI73025B - FOERFARANDE OCH EN STOMKONSTRUKTION SOM TILLAEMPAR DETTA TILL PRESSPARTIET AV EN PAPPERSMASKIN FOER UTBYTE AV VAEVNADER OCH / ELLER VALSAR. - Google Patents

Description

73025 1 Method and applicable frame structure for the paper machine press section for changing fabrics and / or rolls Förfarande och en stomkonstruktion som tillämpar detta account press batches av en pappersmaskin f8r utbyte av vävnader och / eller valsar 5

The invention relates to a method in the press section of a paper machine, in particular to the so-called in a compact press section comprising a compact press roll combination, the rolls of which form two or more press nips 10 between which the paper web passes, by which method the fabrics and / or said press rolls are exchanged, said press section comprising a paper web in the direction of travel of said press roll assembly; a rear frame located after the roll combination, in which the space between said front-15 and the rear frame above the roll combination is opened by turning a special intermediate frame arrangement into an open position, at least the pick-up fabric or the like and the upper fabric of the press are directly or indirectly exploited and / or exchanging one or more rolls of said press roll combination.

20

The invention further relates to a frame structure of a compact press part of a paper machine suitable for use in connection with the method according to the invention, which press part comprises a compact press roll arrangement, the press rolls of which form at least two, preferably three or more; 25 press nips between which the paper web passes, preferably in the form of a closed outlet, the press section comprising a front frame located in the direction of web travel before said roll combination and a separate rear frame connected to each other above said roll combination by an intermediate frame arrangement. position with actuators so that a space opens above said press roll combination which is exploitable, in particular when changing said press rolls and preferably also the press fabrics.

In the previously known compact press parts of a paper machine, such as the so-called The Sym-Press® press section has horizontal beams above the press rolls, on both the treatment side and the use side of the paper machine, which integrally connect the front body and the rear body 2 73025 1 of the press section. In this context, as in the following description, the front body means a body part of the compact press roll combination which is located at the front in the direction of travel of the web, to which e.g. a press suction roller is attached. Correspondingly, the rear body means the body part located on the rear side of the press-5 ink roll combination.

In connection with the known body parts of these press parts, there have been difficulties with the replacement of both press fabrics and press rolls. These problems have increased as the widths 10 of the paper machines have increased, especially as the press rolls have become longer and heavier. These problems have been exacerbated by the increasing use of transversely rigid compression fabrics made of plastic materials, which cannot be stuffed into a mole because they then wrinkle into cracks.

15

The above problems have been solved by Beloit Corporation in the so-called "Flip-top" (trademark of Beloit Corp.) with frame structure. In this known press part frame solution, an upper frame is used which is provided with a transverse pivot shaft of the paper machine 20 arranged above the press rolls, around which either the upper part of the front frame or the upper part of the rear frame can be opened. Both of the above-mentioned upper parts of the body cannot be opened at the same time. By opening said upper part of the front body, the exchange of the pick-up fabric of the press part and the fabric which normally acts as the press fabric in the first and second nips can be facilitated. In this case, the upper part of the rear frame is locked as a frame part, on which the opening of the upper part of the front frame takes place. Correspondingly, when the upper part of the front frame is in the locked position, the upper part of the rear frame can be folded so that the pressing fabric of the third press nip is replaceable. The lower fabric of the first nip, which runs mainly in the basement spaces, is replaced by arrangements known per se. Em. The "flip-top" solution can be characterized as a kind of "flap bridge" that opens specifically around the joint in the middle of the bridge and only one half of the flap can open at a time.

35 Applicant's FI patent application No. 844693 discloses a method and a press part applying the method, in which the space between the front and rear bodies above the press roll combination is arranged to be open or, alternatively, to open the special intermediate body by turning it into an open position. around the joint placed on the side of the bin and said open space is directly or indirectly exploited at least in the exchange of the pick-up fabric and the upper fabric of the press and / or in the exchange of one or more rolls of the press roll combination.

It is an object of the present invention to further develop the above-mentioned method and apparatus and to provide an alternative method 10 and a press body structure applying it.

The object of the present invention with regard to the above-mentioned "flip-top" solution is to provide a frame structure of the press part which can be opened even simpler and faster and the implementation of which is more advantageous than the above-mentioned known structure.

In order to achieve the above and later objects, the method according to the invention for changing the fabrics and / or rolls of the press section is essentially characterized in that said intermediate body 20 consists of two separate body parts, namely a front intermediate body and a rear intermediate body. and that, in relation to said articulation points of said front and rear intermediate frames, the outer parts are connected by a connecting part 25 to a fixed part.

The body structure of the press part according to the invention is mainly characterized in that said intermediate body arrangement is formed by two parts which can be pivoted separately in the open and closed positions, namely a front intermediate body fixed to the front frame and a rear intermediate body are secured in their closed position by locking parts to a fixed intermediate part of the intermediate frame arrangement and that said intermediate frames are each provided with their own actuators by which they 35 can be opened and closed.

If the invention is compared with the method and frame structure disclosed in the above-mentioned applicant's FI patent application 844693, it can be seen that in the present invention the intermediate body consists of two pivoting parts, one articulated to the front frame and the other to the rear frame and locked to the rear frame. locking members at the outer ends of the intermediate body parts pivoting to the closed position, which are connectable to a suitable fixed body part, which preferably consists of parts connected to the bearing frames of the central roll of the press.

If the invention is compared to Beloit's above-mentioned "flip-top" solution, the solution of the invention can be characterized as a kind of "flap bridge" which opens around the joints at both ends of the flap bridge so that both flap halves can be opened to the open position at the same time. simpler in structure, easier to place and quicker to open.

15

The invention will now be described in detail with reference to some embodiments of the invention shown in the figures of the accompanying drawing, to which the invention is not limited.

Fig. 1 shows a side view of a press part of a paper machine applying the method according to the invention and a part of the frame structure according to the invention in the closed position.

Figure 2 illustrates the exchange of rolls 25, in particular press rolls, in the press section according to Figure 1.

Fig. 3 illustrates, in a manner similar to Fig. 2, the replacement of the pick-up and press felts of the press section.

The press section shown in Figures 1, 2 and 3 comprises a closed press roll combination 13,16,21,31, which press rolls form three successive nips and between them. In addition, the press section includes a fourth separate nip N 1 formed between the press rolls 33 and 43 (Figs. 2 and 3). The press section comprises a first fabric 10 and a second fabric 35 20 (usually blankets), both of which fabrics 10,20 pass through the first nip and of which the first fabric 10 acts as a pick-up fabric and 5 73025 1 further as a press fabric in the second nip The third press fabric 30 passes through the third nip through and the fourth press fabric 40, which is the lower press fabric, acts as a press fabric in the fourth nip N 1.

Inside the loop of the first fabric 10 there is a pick-up roll 11 with a suction zone, which transfers the web from the forming fabric 27 to the run between the rollers 11 and 13. The guide rollers 12 guide the fabric 10. The second fabric 20 passes under the guidance of the guide rollers 22. Correspondingly, the third fabric 30 is guided by the guide rollers 32. The fourth fabric 40, which transfers the web W 10 from the transfer roll 18 to the last nip N 1, passes under the guidance of the suction transfer rollers 41 and 42 and the guide rollers 42 '.

The course of the web W from the pick-up point is as follows. The suction sector of the pick-up roll 11 detaches the web W from the wire 27 and attaches it to the lower surface of the fabric 15 10 where the web W passes through the double woven nip.

The lower roll 21 of the nip is provided with a hollow surface 21 '. After the nip N 1, the web W follows the first fabric 10 under the action of the suction sector 13a of the suction roll 13. The web W moves in the second nip Nj to the surface 16 of the center roll 16 with a smooth surface 16 'and further to the third nip N 20, 20 after which the web W follows the center roll 16 and moves for the fabric 40 in the suction sector of the suction roll 41 and further to the second: the suction roll 42 and further supported by the fabric 40 on the nip if used.

The structure and operation of the press part described above are mainly known from the prior art and are described here only as a background of the invention and an example of the application environment.

The method and the body part according to the invention can also be applied in such a press part, in which the web also has free tensions in connection with a compact press roll arrangement. The different press rolls can also be fastened and fitted differently than shown in the figures.

The body structure of the press section comprises a front body 50, in the upper part of which a pivoting subframe 51 of a horizontal joint 52 is mounted, on which the guide rollers of the first fabric 10 are mounted, the second roll being fixed to the tensioner 54 for tightening the fabric 10. The front body 50 has openable 6 73025 1 snacks 35 and 55 for changing the first tissue 10.

The body part according to the invention comprises a rear body 70, the front side of which has cantilever portions 71 to which a rear intermediate body 60b, fixed above the compact roll arrangement 13, 16, 21, 31, is fixed via horizontal joint shafts 62b. The central roll 16 of the press is fixedly mounted in its own body part 19.

According to Figures 2 and 3, the front frame 50, the sub-frame 51 and lower frame 10 used-part and the front side connecting the sides cantilever beams 110,111 and 114, which at one end is supported on pulling member (not shown) in the lower beam. The floor level of the paper machine building is indicated by reference 501.

According to Figure 1, the intermediate body 60 consists of two parts, namely 15 front intermediate body 60a, which is articulated to the front body 50 by a horizontal joint 62a. The front intermediate body 60a is pivotable about said horizontal axes 62a by actuators 64a '. The front intermediate body 60a consists of substantially V- or L-shaped side portions attached at opposite ends of its articulation 62a by a connecting portion 65a to an intermediate body 60c of the intermediate body 60, 20 which in turn is attached to bearing housings 17 attached to the body 19 of the press roll. parts 14 on which the suction roller 13 of the press is mounted. The intermediate frames 14 are pivotable relative to the front intermediate frame 60a by power devices 14a, with which the nips and Nj are also, at least in part, loadable.

25

According to Figure 1, the intermediate body 60 includes a second intermediate body, namely a rear intermediate body 60b, which is attached to the protruding portions 71 of the rear body 70 by a horizontal joint 62b for opening and closing by actuators 64b for the above purposes. A press roll 31 is formed in the rear intermediate frame 60b by means of a body portion 67b 30 forming a third press nip with a central roll 16.

The press roll 31 can be moved to the open position 31 'relative to the rear intermediate body 60b by using power devices 68b, with which power devices the nip 35 can also be loaded. The side beams of the rear intermediate body 60b are substantially U-shaped when viewed from the side and are attached at their opposite end of their articulation 62b to said fixed intermediate part 60c of the intermediate body 60 by a connecting part 65b when the intermediate body 60 is closed.

The intermediate body 60 5 shown above in Fig. 1, consisting of two body portions 60a and 60b and a fixed portion 60c connecting them, is opened and closed for the purpose described above.

Figure 2 illustrates the exchange of rolls according to the method of the invention. As shown in Figure 2, the subframe 5L above the front body 50 is pivoted about the articulated shafts 52 to the open position 51 'by opening the joint 10 53a, 53b. The subframe 51 may also be fixed, in which case it is only edge-widened when the fabric 10 is changed. If the subframe 51 is pivotable, it does not need to be pivoted when changing the roll. Before replacing the roll or rolls, the fabric inside which the roll is located has been removed. According to Fig. 2, lifting ropes 95 are attached to the shaft pins of the suction roller 11 ', which are attached to the lifting hooks 90 of the traverse crane. The pick-up roller is changed in known ways.

Prior to lifting the press rollers 13, 16, 21 and 31, the connections 65a and 65b of the press intermediate body 60a, 60b have been opened and the intermediate bodies 60a, 60b have been turned from the closed position of Figure 1 to the vertical open position 60a ', 60b' schematically shown in Figures 2 and 3. . In this case, a free space T open from above opens, through which the lifting of said press rolls 13, 21, 16 and 31 can be performed.

: 25 The suction roller 13 of the compact press part is fastened by lifting straps 96, which: are attached to the lifting hook 91. The suction roller 13 is lifted directly up by the so-called as a middle lift and is moved to the side of the press part while turning it in the state T. The lower roll 21 of the first nip can then be lifted in the same way by means of lifting straps 96 '. The suction roller 13 can be lifted either from the shaft 30 with two lifting ropes or with a so-called as an average lift with lifting slings.

With the intermediate frames 60a, 60b in the open position 60a ', 60b', the third nip press roll 31 can also be changed as a middle lift with lifting ropes or cloths 98 by means of a lifting hook or hooks 93. Prior to this, the roller 32c is moved along the route α to the parking space 32a '. After the removal of the third fabric 30 or the transfer of the tension roll 30 to the parking space 32a 'of the fabric 30, a free space T 1, 8 73025 1 opens above the fourth nip which is open at the top so that the press rolls 33 and 43 can also be lifted as a middle lift. According to Fig. 2, the press roll 33 is lifted by lifting straps 99 attached to the lifting hooks 94 and the lower roll 43 by a lifting member 99 '.

5

By the average lift described above, it is meant that the roll hangs on only one crane hook on lifting slings which support the roll in a downwardly open V-shape symmetrically on both sides of its vertical center plane. This central lift has the advantage that the roll can be rotated horizontally about its vertical central axis, which generally facilitates the movement of the rolls even in the narrowest places. When lifting from the axle pins of the roll, the roll can usually only be moved while maintaining its longitudinal direction, because the use of two cranes in cooperation is cumbersome and dangerous from the point of view of occupational safety.

15

Figure 2 above shows for replacement or maintenance all rollers 11,13,21,31,33,43. In practice, however, only one roller, either in need of replacement or maintenance, is usually lifted at a time, removing only the necessary amount of tissue and opening the necessary body parts.

Figure 3 illustrates the exchange of all different tissues 10,20,30 and 40, which is not always performed at the same time. 10 for exchange of the first fabric is the front frame 50 sub-frame 51 translated to the joint axis 52 to 25 around the open position 51 ', or if the sub-frame 51 is fixed, it is only kanttileveerattu, and 51 parts of the sub-frame 54 supported was 10 tensioning roll of the fabric is moved to the parking place 12a' of the arrow N along the route set out in

connection 30 of the first fabric 10, the exchange of the suction roll 13 is transferred to the lateral position 13 'by rotating the intermediate frame 60R vertically to the open position 60a' side and the front of the body 50 intermediate pieces 35 and 55 are opened so as to form a body of open slots V, through which the felt loop 10 ' slipped into. In connection with the replacement of the second fabric 20, the suction roll 13 is moved to the side position 35 13 'and the press roll 21 to the lower position and the snacks 25 of the body 26 are opened.

In connection with the replacement of the third fabric 30, the snacks 72 and 73 are opened and the tension roller of the fabric 30 is moved along the path α to the parking space 32a 'above the rear frame 70. The intermediate body 60b is turned to the open position 60b ', whereby the press roll 31 and its guide rollers 32c and 32d (Fig. 1) are also turned to the inner positions, whereby the above-mentioned open space T is created to facilitate the change of the fabric 30.

In connection with the replacement of the lower fabric 40 of the fourth nip, the snacks 72,74,75 and 45 as well as the nip are opened, whereby the replacement of the fourth fabric 40 may possibly take place from above via an open space.

10

The felt roll 400 is pushed along a rail (not shown) in the space between the machine snacks 72 and 74.

3, the resting on 101 carried by the salon hoisting wire ropes of the first 15 of the fabric roll 100 is introduced into the paper machine side of the page and the roller 100 is unloaded link 10 ', which is threaded spaces V and operating position of the nips and ^ through the opened Cantilevering-beam 111 around it, after which the roller 12a' is moved to its operating position and the subframe 51 'is turned to the closed position and its connections 20 53a, 53b are fixed.

When the second fabric 20 is changed, a roll 200 is introduced into the second fabric with a sling on the wires 201 on the side of the paper machine, after which the loop 20 'unloaded from the roll 200 is threaded around the edge spreading beams through the open spaces V25 and the opened first nip. Prior to this, the tensioning and guide rollers of the fabric 20 located in the basement spaces below the floor level 501 have been moved to an upper position below the roll 21 to the level of the edge spreading beams 114, e.g. by arrangements and devices as shown in the applicant's FI patent application No. 803020. The roll supporting the roll 200 is then moved in its support cables 201 towards the position T in the position shown in Fig. 3, whereby the second fabric 20 comes into operation around the edge spreading beams 114 with the nip sufficiently open.

The replacement of the third fabric 30 is carried out by unwinding the loop 30 'from the spool 300 of the salo 301 and threading it through the spaces V around the various rolls 10 73025 31 arranged around the edging beams 113. about.

J The change of the fourth fabric AO is performed in the same manner as the fabric 20 so that with the fourth nip open, a fabric loop 40 'is threaded from the spool 400 resting on the wires 401 around the edge spreading beams 115 as shown in Fig. 5.

5

The measures to be taken in connection with the replacement of different blankets and different rolls are listed in detail in the applicant's previous FI application No. 844693.

As described above, the tissues 10, 20, 30 and 40 can be changed more advantageously so that there is sufficient space for different operations during the tissue exchange, in particular because the body parts 60a and 60b according to the invention can also be opened to a position favorable for tissue exchange. . The body portions 60a and 60b can be opened both or only one as needed.

As can be seen from Figure 3, thanks in part to the method and body of the invention, the rollers entering the interchangeable tissues are in a very small space and close to each other, whereby the free loop around the different rolls and edge release beams is relatively small and preferably substantially tear-shaped. simplifies threading work. The method according to the invention for tissue exchange is also excellently suitable for use with plastic fabrics which cannot be laterally creased on the myth.

25

The solution of the invention can also be applied to press parts other than those described above, e.g. the applicant's Sym-Press I and Sym-Press II (trademarks) press parts, in which the former has only two nips, i.e. nips and N 1, and no separate nip N 1 or in which the latter has three nips and no separate nips N ^.

In this case, either the third and fourth tissues or the fourth tissue are omitted.

Many other variations are also possible within the scope of the inventive idea.

35 11 7302 5 1 The following are claims which, within the scope of the inventive idea defined by them, the various details of the invention may vary.

5 10 15 20 25 30 35

Claims (6)

1 Patent claim 1. Method in the press section of a paper machine, especially in a so-called compact press part, which includes a compact press roll combination 5 (13,16,31,21), being rolls between forming two or more press nips (Νρ ^, ΝΝ) between which the paper web (W) runs, rotating the webs (10.20, 30) and / or said press rolls (13,16,21,31) in the application of the method are exchanged, which press member comprises a front hour (50) which is located in the running direction of the paper web (W) prior to said press roll combination (13 , 16,21,31) and a rear frame (70) after the roll combination, in which method the space between the front and rear frame (50.70) above the roll combination is opened by pivoting a particular intermediate frame arrangement (60) in an open bearing. wherein, by utilizing the open space in question, the exchange of at least one pick-up tissue (10) or equivalent and any upper tissue (30) of the press and / or the exchange of one or more rollers (13, 16, 21,31) in said press roll combination, characterized in that said intermediate body (60) is formed by two separate body parts (60a, 60b), namely a front intermediate body (60a) and a rear intermediate body (60b), of which the front the intermediate body (60a) is rotated about the horizontal joints (62a) attached to the front body (50) and the rear intermediate body (60b) to the horizontal joints (62b) attached to the rear: the body (70), and the outer members the portions are coupled in relation to the guide points (62a, 62b) by the front and rear intermediate bodies (60a, 60b) by means of welding portions (65a, 65b) to a fixed portion (60c). A method according to claim 1, characterized in that said intermediate body (60) is closed to a fixed position by coupling the outer parts of the intermediate bodies (60a, 60b) to welding parts (65a, 65b), e.g. to the loading portions (65a, 65b) of the fixed intermediate body (60c) in connection with the bearing housings (17) in the pre-roll center roll (16) or the like. 3. A method according to claim 1 or 2, characterized in that the press roll (13) forming part of the first and second nip (N 1, 2) of the press roll combination is suspended by a horizontal joint (15) at the front intermediate body (15). 60a) by mediating the body part (14) to be pivoted by means of force devices (14a) for loading the first and / or second nip (ΝΝ, Ν och) and for the pressing roller (31) of said pre-selection combination which forms the third nip (N ^) of the pre-roll mid-roll (16) is suspended so that it can be reversed by a horizontal joint 1 joint with the rear intermediate body (60b) into the outer body portion (67b) which can be rotated into retaining to the rear intermediate body (60b) by means of force devices (68b) especially for loading the third nip (N 1). Method according to claim 1,2 or 3, characterized in that the exchange of the at least the middle roll (16) and the suction roll (13) in said pre-roll combinatlon (13,16,21,31) is carried out with a so-called. center lift by first moving the roller in its axial direction towards the service side (H) of the paper machine and by utilizing said free space (T) to rotate the roller (13,16) to be replaced in the machine direction, which occurs while the other the end of the roller (13,16) is inside the free space (T) of the body of the pressing portion. A frame structure for a compact press part in a paper machine suitable for use in connection with the method of claim 1,2,3 or 4, said press part comprising a compact press roll arrangement (13,16,21,31), the press rolls of which forming between themselves: at least two, most preferably three or more press nips (ί ^, Ι ^, Ν ^) between which: the paper web (W) runs, most preferably as a closed pull, the press portion comprising a front frame (50) which in the running direction of the web (W) is located prior to said roller combination (13,16,21,31) and one in relation to this separate rear frame (70), which is front frame (50) and rear frame (70), above said roller combination ( 13,16,21,31) joined to each other by means of a middle frame arrangement (60) which can be pivoted in an open position by means of functional devices (64a ', 64b), so that the above-mentioned press roll combination opens up a space (T) which can be used especially when replacing said press rolls (13,16,21,31) and most often also when exchanging press fabrics (10,20,30), it can be noted that said intermediate frame arrangement (60) is formed of two parts which can be rotated separately in an open and a fixed position, namely from the the front intermediate body (60a), which is secured to the front body (60) by means of horizontal joints (62b) and from it