FI127216B - A device for replacing fabric with a web forming machine - Google Patents

Description

APPARATUS FOR TEXTILE REPLACEMENT BY BREAKING MACHINE

The present invention relates to a device for replacing fabric with a web forming machine, which device is intended to be mounted on the frame of a web forming machine, and which device comprises

two opposed export means (18) for tissue transfer, and

Lifting means for establishing an export path between the export means for the fabric, and each export means including a body adapted to be part of the lifting means as each export means consists of folding rolls fitted to the frame and guiding the fabric into a matched strap loop.

The prior art is described, for example, in European Patent Number 1866479. In this solution, the export means is housed in a separate outer body which is integrated into the body of the fiber web machine. The export means are also contained within the outer body. To form an export route, the device includes Lifting Equipment. The solution shown applies both a pressure chamber incorporated in each export means and jacks fitted inside the outer body. After the export path has been established, the tissue can be passed through the body through the export means and thus the tissue is replaced with a web forming machine. During operation, the outer frame carries the loads on the frame and the lifting means are in a resting position without any fixed frame contact. A device for tissue replacement is also disclosed in Finnish patents 118479 and 122220.

Lifting equipment takes up a lot of installation space and requires regular maintenance, which can only be done by a workshop when disassembling. Especially the oil used in jacks directs dirt when leaking around the unit. Jackets and pressure chambers have lifting capacity

20166007 prh 06 -11-2017 modest and the lifting is short as the lifting equipment and the surrounding frame compete for limited space. These limit the application of the device and complicate tissue replacement. Especially stuttering slows down tissue turnover.

In addition, the outer body is a large structure. Generally speaking, the device contains a large number of components, which shortens the failure interval. At the same time, however, the device has a limited capacity and a lot of different automation.

The object of the invention is to provide a novel device for changing the tissue on a web forming machine which is more compact but more durable and efficient. Characteristic features of the device of the present invention are apparent from the appended claims. The device according to the invention has utilized the properties of the components in a new and surprising way. Thus, many of the components required by the prior art may have been completely omitted, or at least replaced by better ones. This has reduced the number of components and at the same time increased the performance of the device. Serviceability has also improved, but the number of items requiring service has decreased and the number of interchangeable components has increased. At the same time, manufacturing precision has become less known. The result is a reliable and efficient device that can be easily positioned in different positions.

The invention will now be described in detail with reference to the accompanying drawings, in which:

Figure 1 is a side view of an example of a press section body of a fiber web machine,

Fig. 2a shows a device according to the invention, viewed from the left front oblique position in the driving position,

Figure 2b shows the image

2a in the changeover position of the device, showing the device according to the invention from the right front view in the running position, showing a cross-section of the device according to the invention in the running position, Fig. 3b

Figure 3b

Figure 3c

you, Picture 4a present an export device according to the invention the body after machining from the first side deemed tuna, Picture 4b present 4a, viewed from the other side of the body

as.

20166007 prh 06 -11- 2017

Figure 1 shows an example of a press section of a fiber web machine viewed from the treatment side. The press section comprises a frame 10 having beam structures 11 and 12. The load is particularly supported by vertical beams, which may also be inclined. This press section has two clamps 13, each having two webs 14. The webs 14 formed as endless loops are supported by rolls 15 supported on the frame 10. The fiber web machine typically has a plurality of closed-loop fabrics that need to be replaced as needed. For example, a fiber web machine refers to paper, board and pulp machines, and belt calenders with interchangeable fabrics. Closed fabric loops include, for example, wires on the forming portion and felt and straps on the press portion.

The front side frame system 10 is in the shown embodiment arranged in the running-in equipment which is hereinafter referred to simply as devices. The apparatus is used to replace tissue on a web forming machine and is intended to be mounted on a web forming frame 10.

20166007 prh 06 -11-2017 devices 16 are presented in principle. In addition to the devices, the body 10 includes snacks 17 which are detached during tissue replacement.

Fig. 2a illustrates the device according to the invention in isolation from the body of a fiber web machine. The device includes two opposed export means 18 for delivering tissue 14. The device further includes lifting means 19 for establishing an export path between the export means 18 for tissue 14 10 (Figures 3b and 3c). In practice, the export route allows tissue to pass through the skeleton. Further, each export means 18 includes a body 21 fitted as a part of the lifting means 19. According to the invention, the body 21 includes fastening means 22 for attaching the export means 18 to the body 10.

Further, between the bodies 21, there is a removable intermediate structure 23 arranged to carry the loads of the body 10 to replace the fabric 14 (Figure 3b). First, the surprising design avoids using the outer frame completely. Second, the intermediate structure fitted between the frames of the export means allows the export route to be sufficient even with a slight lifting of the lifting means. Thanks to the new load carrying capacity, the unit is smaller and much smaller than before.

In Fig. 2a, the device is in the run position and the export means 18 are interconnected at both edges by locking means 24, which are here locking plates. It is also advantageous to use pulling rods or eye bolts which can be turned off the road as locking means. The screw solution also makes it possible to pull the device bodies together after penetration, thereby accelerating the device's descent into the runner position. The locking device prevents the frames from moving together while driving, keeping the frame in place despite vibration and load. During travel, the intermediate structure is between the frames

20166007 prh 06 -11- 2017 bearing the load from the frame. Quick-locking and device-locking means are preferably used. In this case, it is easy to remove the locking means and it is impossible to miss the locking means. More generally, the export means and the intermediate structure are secured together by means of locking means to a part of the press frame, whereby the compact structure formed carries the press loads during the run.

When replacing the fabric, the locking means 24 of the locking plate forming the locking means 24 of the embodiment shown are loosened and the locking plates are removed. Thus, another locking means may also be used in place of the locking plate. After release, the distance between the frames of the export means, more particularly the export means, is increased by the use of lifting means. In practice, a sufficient lift is 0.5-5 mm. In this case, the hulls separate from each other, whereby the intermediate structure can be removed between the hulls. Thus, an export pathway is formed between the trunks, allowing the tissue to be exported using the export means. In addition, before the tissue is exported, the end caps 20 are turned to the open position. The end hatches 26 are located at the front and rear of the device and here the end hatches 26 are hinged to the upper export means and, when opened, are locked in said upper export means (Fig. 2b). In Figure 2a, the end hatches 26 are in the closed position. End covers prevent water and dirt from entering the unit. This prevents contamination of the unit, which reduces the need for maintenance.

In the embodiment shown, the intermediate structure 23 consists of two lists 27 arranged outside the export means 18. In this case, the support points formed by the bars are as far apart as possible, which increases the stability of the device. At the same time, the loads on the frame are transmitted through the slats without loading the lifting equipment. This avoids straining the lifting equipment while driving. In other words, lifting tools are needed20166007 prh 06 -11-2017 β

only when replacing tissue. In Figure 2b, the moldings 27 are removed between the frames 21, rotated 90 °, and secured to the lower export means 21 just below the export route 20. In other words, when removed between the bodies 21, the strip 27 is arranged as a tissue guide. When exporting new tissue, the lists direct the tissue to the export route. The thickness of the strip is 5 to 20 mm, more preferably 10 to 15 mm. The thin list is robust, but when you delete a list, you can easily reach a sufficient export path. In addition, the list has no effect on the overall height of the device, since the device has a design height of 315 mm. This dimension is up to 100 mm less than in the prior art.

The width and length of the intermediate structure form the load-bearing area between the frames. Even a simple list carries vertical loads. Preferably, however, there is a wedge structure 28 between the strip 27 and the frame 21, whereby the strips also receive horizontal forces, thereby avoiding the mutual movement of the frames. Similarly, when framing the frames and the intermediate structure, the wedge shapes guide and center the Frame structures. Preferably, the wedge structure 28 consists of projections 29 arranged in a strip 27, with corresponding recesses 30 arranged in a frame 21 (Figure 4b). In Fig. 3b, the moldings 27 are cross-sectioned just at the wedge structure 28 and the recesses 30 are also shown in Fig. 3c. In this case, the mating surface of the body is otherwise flat and slightly lower than the rest of the body surface. When the pressure in the pressure chamber is released for some reason, the fabric remains between the straps of the belt without touching the contact surfaces of the body. This prevents the tissue from being pinched between the skeletons and thus prevents tissue damage.

In new fiber web machines, the device is attached from the chassis of the export equipment to the chassis. Fig. 3a shows five bolts 31 at each edge of the frame. When replacing an existing device

20166007 prh 06 -11-2017 according to the invention, the mounting brackets 22 include a circumferential mounting plate 32. Figure 2b shows a mounting plate 32 attached to the upper frame 21, which is then secured to the frame by another five bolts. The corresponding mounting plate can also be attached to the lower frame. In Figure 2b, the outline of the mounting plate 32 is depicted by dashed lines and the mounting plate is partially cross-sectioned. The mounting plate can utilize the attachment points of the previous device and thus, without major modifications, install a device according to the invention which is narrower and lower than known in the frame.

Preferably, the export means 18 consists of folding rolls 33 and belt loops 34 disposed on the body 21 and arranged around both the folding rolls 33 and the body 21. In this case, the strap loop forms a counter surface against the fabric to be applied and, by means of folding rollers, the fabric can be passed through the body. In the export situation, the intermediate structure has been removed between the frames and only the straps of the export means are in contact with each other and when the tissue is being exported.

The above-described operation is possible when the lifting means is arranged in the body of the export means. More specifically, the lifting means 18 includes a pressure chamber 36 delimited by a pressure water seal 35 on the body 21, the lift 37 of which is provided as the sole lifting means 19 of the export means 18 (Figs. 3a and 3b). In other words, the hydraulic jacks used in the known devices are unnecessary. At the same time, internal piping, booster and valves are avoided. Preferably, the pressure chamber is supplied with a fluid, for example water, which at the same time lubricates without contaminating the environment.

Figure 4b shows the body 21 of the export means, which has a groove 38 for the pressure water seal. The groove is clearly, in practice, at least one and a half times wider and deeper than known.

20166007 prh 06 -11- 2017

In this case, a wider and higher pressure water seal can be used, whereby a higher pressure can be applied in the pressure chamber, thereby increasing the lifting capacity of the device. The lifting means of the present invention now have a lifting capacity of 500 to 2000 kN. In this case, the device can be mounted on larger fiber machines than any other machine. At the same time, greater lifting and better sealing is achieved. In practice, the total lifting capacity of the lifting means is 2-8 mm. In this case, the intermediate structures can be dismantled, whereby an adequate export route is easily achieved. Figures 4a and 4b also show relief cavities 39 by which the mass of the casting can be reduced. The lightening cavity can also be utilized to secure the bolts 31 (Figures 3a and 3b).

In addition to sizing, the seal has a new structure. The rubber pressure water seal is now provided with a bearing plastic sliding member which corresponds to the inner surface of the strap (Figures 3b and 3c). In practice, a pressure water seal is an endless loop that fits into a groove in the body and is secured by a holder. Water is pressurized into the pressure chamber defined by the pressure water seal, body and strap loop, thereby increasing the distance between the bodies. Known pressurized water seals were slip-coated rubber, which, when worn, could become high-friction. In the pressurized water seal according to the invention, the lowest deformable part is still rubber, which can control the lifting of the pressurized water seal by the pressure of the liquid. Similarly, the upper part of the pressure water seal up to the underside of the holder is made of bearing plastic, the wear of which does not affect the friction. In practice, only the upper part of the pressure water seal extends beyond the holder while the lower part remains in the groove.

The seals in Figures 3b and 3c together with the metal belt allow hydraulic lifting of the pressure chamber. As shown, the seals can be two-component, with the metal sleeve 20166007 prh 06 -11-2017 bearing a plastic resin and underneath a rubber whose deformation by hydraulic pressure allows the seal to be extended and thus raised. It is also preferable to use a separate load seal under the sliding pressure water seal (not shown). In this case, the reach of the load seal can be adjusted by pressure, for example by air pressure independently of the hydraulic pressure of the chamber.

The invention provides a leakage water seal 40 having a similar structure outside the outer circumference 10 of the pressure water seal 35, which also has a holding groove 41 in the body 21 (Figure 3c and Figure 4b).

In this case, like a pressure water seal, a leakage water seal can be made to prevent leakage. In addition, by removing pressure from the pressure chamber, both seals return to their grooves. During installation, the seals are fitted into their grooves and brackets are mounted on the seals to limit the rise of the seals.

The connections leading to the pressure chamber are illustrated in Figure 3a. The body 21 of both export means has a feed connector 42 and a return connector 43. This allows easy connection of pressure lines to the device. On the opposite side of the device are hydraulic motors 44 arranged in the folding rollers of the lower export means (Fig. 2a). The feed and return pipes for the hydraulic motors are arranged outside the frame. This avoids tubing inside the frame and more generally the device. Thus, the device can be serviced even when attached to the chassis. Here, the hydraulic motors are also connected in parallel, whereby one valve can be used to control both hydraulic motors. At the same time, the motor rotates in the same direction at the same speed.

In addition to eliminating the outer body, the body of the export means is simpler and smaller than before. In Fig. 4a, the brochure 10 shows a body 21. The edges of the body 21 have brackets 45 which are machined to be flat and punched in the form of fastening means 22. In addition, the body 21 has a recess 46 for the folding roller 33. In this case, the brackets required to support the folding roller are short, which increases the stability of the structure. Preferably, a wedge structure is also used between the body and the body, whereby also the connection is durable and free of play.

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In addition to the end hatches described above, the device is also better protected. Each folding roller has shielded sides to cover removable

with end housing 47 and the body side panels 48 (photo 2a). Here tu, giving water or dirt no in. According to the invention device : demands

room. In addition, the machine is sturdy and supports the loads on the frame when driving. By adjusting the frames of the export means to carry the loads, it has been possible to completely eliminate the outer frame. In addition, using an intermediate structure, a sufficient export route is achieved. In addition, a short lift is sufficient to form the intermediate structure, which is also quick and efficient. At the same time, separate hydraulic jacks are unnecessary. Pressure chambers have become more efficient and sealed. In addition, the wide seals allow greater trunk movements during tissue replacement. However, when the intermediate structure is restored and the export means are locked together, a precise and durable joint is formed that withstands the loads on the frame during runtime. While driving, the device, and especially the export equipment, is well protected and unloaded.

Claims (11)

20166007 prh 18 -08- 2017 An apparatus for replacing fabric with a web forming machine, which device is intended to be mounted on a web frame (10) of a web forming machine, comprising: two opposed export means (18) for inserting tissue (14), and - Lifting means (19) for forming an export path (20) between the export means (18) for the tissue (14), 10 and each export means (18) includes a body (21) fitted as lifting means (19), each of the export means (18) being formed by folding rolls (33) and fabric (14) inserted into the fabric (14) to contact the belt strap (34); which is fitted to both the folding rollers 15 (33) and around the body (21), characterized in that the body (21) comprises fastening means (22) for attaching an export means (18) to the body (10), and between the bodies (21) there is a removable intermediate structure (23) ), which is arranged to carry the loads of the frame (10). Device according to Claim 1, characterized in that the fastening means (22) comprise a circumferential mounting plate (32) attached to the frame (21). 25 Device according to Claim 1 or 2, characterized in that the intermediate structure (23) consists of two strips (27) arranged outside the export means (18). Locking means according to one of Claims 1 to 3, characterized in that between the frames (21) there are removable (24) for connecting the frames (21) to a load-bearing structure. Device according to one of Claims 1 to 4, characterized in that the body (21) has a recess (46) for the folding roll (33). Device according to one of Claims 1 to 5, characterized in that the lifting means (19) comprises a pressure chamber (36) delimited by a pressure water seal (35) on the body (21), the lifting device (37) being arranged as the sole lifting means (19). . 7. A leakage sealing groove (41) provided in the pressure water seal. device (35) according to one of the preceding claims, characterized by (35) an outer periphery (40) having a body (21) 8. The one of claims 3 to 7, characterized in that the wedge structure (28) of the strip (27) and the frame. device (21) is between 20 Device according to one of Claims 3 to 8, characterized in that the strip (27) is arranged as a tissue guide when removed between the bodies (21). 20166007 prh 18 -08- 2017 A device according to any one of claims 1 to 9, 25 characterized in that the total lifting means (19) is 2 to 8 mm. Device according to one of Claims 1 to 10, characterized in that the lifting means (19) have a lifting capacity of 500 to 2000 kN.