FI127017B - Moving frame structure for the back roll of a fiber web press - Google Patents

Description

MOBILE FRAME STRUCTURE FOR FIBER MACHINE PRESSURE ROLLER

The present invention relates to a moving frame structure for a fiber roll machine press counter roll having two ends and a bearing housing arranged at each end, the movable frame body comprising: - leaning on the machine plane longitudinally of the counter roll to move the counter roll in the cross machine direction.

The moving frame structure is a structure for supporting, moving and moving the fiber roll machine press roll counter roll, which is used to support the roll roll from its bearing housing using the moving arms to the fiber roll machine frame. The moving frame structure comprises the structures necessary for moving the nip roll, i.e. the moving arms, and the roll-changing structure between said moving arms, which is supported between the moving arms or the machine plane. Liikutusrunkorakenne also enables the counter roll and a second nip roll, which is selected from a solid roll, a variable-crown roll, suction roll, sym-roll or trimming press roll, moving relative to the nip rolls press the second roll of the nip to open and to load the press nip together with the counter roll the drive-side support of the bearing housing of the roll transfer machine or machine.

Conventionally, the movable frame structure comprises movable arms for supporting the counter roll from its bearing housings and a frame beam disposed between the movable arms as a rigid structure. The purpose of the beam is to stiffen the moving frame structure underneath the roll and to support the displacement of the counter roll. The frame beam is quite massive in size and due to the increase in the size of the fiber web machines, the frame beam has increased even more, especially in height. Such a moving frame structure is known from FI 82088 C.

The problem with the traditional moving frame structures described above is the large size and stiffness of the frame beam. An excessively rigid frame beam may cause nip profile asymmetry in the fiber web machine production at the press-nip rolls and skew loading of the press. In addition, an over-rigid frame beam makes alignment difficult, since the frame beam does not allow the displacement frame structure to bend.

The object of the invention is to provide a more flexible moving frame / roll change structure which is also more versatile than the prior art moving frame structures. Characteristic features of the present invention are set forth in the appended claim 1. This object may be achieved by a movable frame structure for a fiber roll press press roll which has two ends and a bearing housing fitted at each end, which movable frame includes In addition, the moving frame structure includes a roller structure formed transverse to the fiber web to move in a transverse direction, which is formed by a transverse roller structure, which is surprisingly called lateral beams, to permit flexibility. Composed of two side beams, the roll replacement structure is considerably more flexible and lighter than the prior art single massive roll bar bearing under the roll bearing housing. The side beams of the moving frame structure according to the invention allow for sufficient flexibility, whereby the roll changing structure allows small misalignment without causing the load to be distorted in the press nip. Sidebars are also supported to keep the distance between sidebars the same.

Preferably, the side beams are positioned vertically between the bearing housings and the movement arms on the sides of the bearing housings in the drive roll operating position. This leaves enough space in the moving frame structure for detaching the counter roll and making the structure lower than with one large frame beam.

Each side beam is preferably arranged between the movement arms or to rest on the plane of the machine. In this way, both side beams act as support for the movement frame structure.

The side beams are preferably arranged in parallel. In this context, parallelism means that the side beams are at different points along the length of the fiber web machine relative to each other, i.e. in other words, the side beams are not superimposed but transverse to the fiber web machine.

In one embodiment, the side beams are identical and are mirrored relative to one another at the lower corners or sides of the counter roll bearing housing. In this case, the support is symmetrical and the side beams are inexpensive to manufacture.

The moving frame structure may include a change carriage for moving the counter roll away from the inside of the fiber web machine frame transverse to the rails attached to the side beams. The structure of the moving frame structure according to the invention enables the transfer of a conventional counter roll with an interchangeable carriage.

Preferably, the roll replacement structure comprises a press-dewatered recovery tray comprising side beams in the form of splash plates and a bottom plate fitted between the side beams or connected to the side beams. Such a recovery trough can be formed without separate splash plates, which simplifies and lightens the moving frame structure while reducing the number of separately supported accessories.

Preferably, the roll change structure includes a scraper supported on one side bar for scraping the counter roll. The scraper support can then be implemented without a separate bar to support the scraper, which simplifies the structure of the fiber web machine and frees up space.

According to one embodiment, the side beams are welded to the movement arms. The welded structure prevents the joint from forming between the side members and the movement arms.

According to another embodiment, the side beams are bolted to the shelves of the movement arms. This makes removal of the side beams from the movement arms easier than in welded structures. In addition, such attachment allows for a more flexible structure, which further eliminates the problems associated with rigid structures.

The width of the side beams may be substantially 15 to 40%, preferably 20 to 30%, of the width of the bearing housing. In this case, the side beams do not take up too much space in the lateral direction and, on the other hand, are sufficiently rigid to support the bearing housings, but still flexible.

Preferably, the deflection of the side beams in the roll change is 1 to 2 mm / m. This deflection allows for small misalignment without the misalignment of the press nip. In other situations, the deflection of the sidebars is insignificant.

The side beams may have a height of 300 to 900 mm, preferably 400 to 700 mm. In this case, the side beams are high enough to function effectively as splash plates. More specifically, the moving frame structure according to the invention is characterized in that the roll change structure is formed by two separate side bars to allow flexibility of the roll change structure.

The moving frame structure according to the invention achieves a structure with lower rotational stiffness than prior art moving frame structures, which reduces the accuracy requirements of the alignment. In addition, the use of a moving frame structure according to the invention saves weight of up to about 2 t and thereby achieves cost savings in material. The mobility frame structure according to the invention has a bearing capacity sufficient to replace the rollers of the full-width presses, even for fiber web machines over 7 meters wide.

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

Figure 1 is a side elevational view of an embodiment of a moving frame structure according to the invention with a press section of a fiber web machine,

Figure 2 is a side elevation view of the movement frame structure of Figure 1,

Figure 3 is a side elevation view of a moving frame structure according to another embodiment,

Figure 4 is a side view of a moving frame structure according to a third embodiment.

Fig. 1 shows a first embodiment of a moving frame structure 10 according to the invention in connection with a press 104 of a fiber web machine 100. As shown in Figure 1, the movement frame structure 10 according to the invention relates to the support of the first roll of the first press nip 102 of the press nip 102 to the fibrous web machine 100 or alternatively to the single press design. The purpose of the counter roll 12 is to act as the counter roll of the roll 102 by means of which the fibrous web arriving from the wire section is squeezed out of water. The function of the moving frame structure 10 is to act as a support structure for the fiber web machine 100 of the counter roll 12, which also allows the press nip to be opened and closed by moving the counter roll 12 and moving the counter roll 12 from the fiber web machine 100 With the displacement of the counter roll 12, it must be possible to move the counter roll 12 away from the roll 102 so that there is sufficient space for the move.

Figure 2 shows in greater detail det. A is a simplified embodiment of a moving frame structure according to Figure 1, illustrating a moving frame structure and an application based on a plane. Figures 1-4 show a total of three different embodiments of the moving frame structure according to the invention. Figure 2 is an enlarged view of the first embodiment of Figure 1 in a reduced form, which should be understood to apply to corresponding nip structures such as Figures 3 and 4. The only change between embodiments is within the motion frame structure itself, i.e., in the area shown in Figures 2-4.

As shown in Figure 2, the moving frame structure 10 includes two movement arms 18 at each end roll 12 connected to a body of a fiber web machine 100 to support a counter roll 12 from its bearing tuft 16 to a fiber web machine 100 and a transverse web and at the same time to allow flexibility of the moving frame structure 10. As shown in Figure 2, at each end of the counter roll 12 there is a U-shaped movement arm 18 to which the side beams 22 of the roll change assembly 20 are attached at their ends as well as the counter roll 12 from its bearing housing 16. The function of the arm 18 is to open and close the press nip. The slave cylinder 18 can be rotated about the pivot point 42 of the slider shaft 18, whereby the counter roll moves relative to the other roll and the clamp nipple is either opened or closed.

In the propulsion frame structures according to the invention, the side beams are preferably located vertically in the lower corners of the counter roll bearing housing. In other words, the side beams are located at the lower corners of the bearing roll housing of the counter roll so that it is possible to move the counter roll in the vertical direction of the fiber web machine. The bearing housing can have a width of 1100 mm, while the counter roll has a diameter of 1300 mm. In this case, the distance between the side beams is at least 1100 mm so that the counter roll can be lowered into the change carriage without the side beams impeding this movement.

Preferably, the moving arms are straight structures that are movable structures of the fiber web machine body in alignment with other parts of the fiber web machine body. The side beams of the moving frame structure may be made of acid-resistant steel or the like.

Preferably, the drive body structure 10 has a recovery tray 28 in which the side beams 22 form the Rois plates 30 and a base plate 32 is disposed therebetween underneath the counter roll 12. The structure of the side beams 22 and the base plate 32 may be V-shaped. Preferably, the base plate is inclined towards either end of the counter roll. By means of the recovery tray 28, the water of the press 104 flowing from the counter roll 12 is controlledly led along the recovery tray 28 to the wire well. In the embodiment of Figure 2, the side beams 22 of the roll change assembly 20 are partially triangular in cross-section, extending nearly to the center of the counter roll. In this case, they effectively function as splash plates 30 on the sides of the counter roll 12, eliminating the need for separate spill plates used in prior art solutions.

As shown in Figure 2, the side beams 22 of the moving frame structure 10 can also act as side beams of the scraper 36 and the spray pipes (not shown), whereby the scraper 36 is supported directly on one of the beams. In addition, the side beams 22 serve as roll change beams on which the rails 26 of the change carriage 24 for changing the counter roll 12 are supported. Preferably, the change slide 24 is fixed to the drive-side roll 12 to the bearing housing 16 and its rails 26 in turn is kannakoitu the side panels 22 above base plate 32. For example, the rails may be 600 to 1500 mm apart. In this way, the counter roll can be lowered to the rails by its interchangeable carriage when the separate spacers have been removed between the bearing housing and the operating arms and the operating arms have been lowered sufficiently. Thereafter, the bearing box may be detached from the movement arms and the counter roll may be guided by a change carriage along the rails transversely out of the fiber web machine. In the driving situation, the intermediate pieces are disposed between the bearing housing of the counter roll and the movement arm, whereby the spacers keep the change carriage of the counter roll from its rails. Further, at the ends of the moving arms 18, a felt roll guide roll 40 may be supported to change the path of the felt.

Figure 3 shows another embodiment of the moving strut structure according to the invention, which differs from the embodiment of Figure 2 with respect to the shape of the side beams 22. In this embodiment, the side beams 22 are rectangular in cross section, so that they do not function as efficiently as the recovery beams of the recovery tray as the side beams 22 of Figure 2. Therefore, separate splash guards can be used in this embodiment as additional to the side beams 22. On the other hand, these side beams 22 are less expensive and simpler to manufacture than the side beams 22 of Figure 2. Also, in the embodiment of Figure 3, the side beams 22 serve as a roll change beam and the scraper can be supported on the side beams 22 using a separate intermediate arm (not shown).

In the third embodiment of the invention shown in Figure 4, the side beams 22 again have a cross-sectional shape that extends almost to the middle of the counter roll. In this embodiment, the sidebars are slightly larger than in the embodiment of Figure 2. Further, the portion forming the bottom plate 32 of the recovery tray is wider and thicker than in the embodiment of Figure 2. Separate platform blocks may be provided between the movement arms and the bearing roller bearing housings to support the bearing housings at the correct height.

The side beams may be welded to the movable arms or alternatively also by means of bolts. According to one embodiment, separate movement shelves protruding from the inner surface of the movement arms can be made on the movement arms, on which the side beams are supported and bolted vertically. This creates a joint between the arms and the side beams.

The moving frame structure according to the invention may also be supported by a felt unfolded roller for feeding the felt to the cycle. This can be positioned relative to the working cylinder of the movement arm on one side of the bearing housing. Unlike the moving frame structure disclosed in the present invention, the stiffness of prior art moving frame structures can also be reduced by supporting a single sidewall on the moving arm shelves by bolting or by supporting the sidewall directly on the machine plane of the fiber web machine as shown in dotted lines.

Claims (10)

A moving frame structure for a press roll roll of a fiber web machine having two ends (14) and a bearing housing (16) disposed at each end (14), wherein the moving frame structure (10) comprises two movable arms (18) mounted on a frame roll 12) for support from its bearing housing (16) to the fiber web machine (100) and to allow vertical movement of the bearing webs (16), a transverse roll change structure (20) of the fiber web machine (100) in the transverse direction, characterized in that said roll change structure (20) is formed by two separate beams (22) to allow flexibility of the roll change field (20). Movement frame structure according to claim 1, characterized in that said beams (22) are positioned vertically between the bearing housings (16) and the movable arms (18) on the sides of the bearing housings (16) in the operating position of the counter roller (12). Moving frame structure according to Claim 1 or 2, characterized in that the moving frame structure (10) comprises a change carriage (24) for moving the counter roll (12) out of the inside of the fiber web machine (100) and transverse to the fiber web machine (100). . Movement frame structure according to one of Claims 1 to 3, characterized in that the connecting frame structure (10) comprises a water recovery tray (28) discharged by a press (104), which comprises said beams (22) as splash plates (30) and arranged between the beams (22). a bottom plate (32) connected to the beams (22). Movement frame structure according to one of claims 1 to 4, characterized in that the movement frame structure (10) comprises a scraper (36) supported on one of the beams (22) for scraping said counter roll (12). 6th The movement frame structure according to any one of claims 1 to 5, characterized in that said beams (22) are welded to said movement arms (18). Movement frame structure according to one of claims 1 to 5, characterized in that the beams (22) are bolted to shelves belonging to said movement arms (18). Moving frame structure according to one of Claims 1 to 7, characterized in that the beams (22) have a width of substantially 15 to 40%, preferably 20 to 30%, of the width of the bearing housing (16). Movement frame structure according to one of Claims 1 to 8, characterized in that the beams (22) have a deflection of 1 to 2 mm / m. Movement frame structure according to one of Claims 1 to 9, characterized in that the beams (22) preferably have a height of 300 to 900 mm, preferably 400 to 700 mm. claim