FI95297C - Apparatus in connection with the scraper of a paper machine and method of guiding the lubricating medium to the roll surface before the scraper blade - Google Patents

Description

53297

Apparatus in connection with a scraper of a paper machine and a method of guiding the lubricating medium to the roll surface before the scraper blade Anläggning i samband med en skavare i en pappersmaskin och förfarande för att leda smöijmedel till roller

The invention relates to an apparatus in connection with a scraper of a paper machine and to a method for guiding a lubricating medium to a roll surface before the scraper blade.

10

Nowadays, it has been found a problem, especially with press rolls, that the shower connected to the scraper does not distribute the water evenly. This results in uneven wear of the scraper blade and further moisture moisture in the paper. It can also be considered a disadvantage that in certain cases the shower water splashes onto the track and only a part of the water remains on the surface of the roll 15 as a lubricating and cleaning element. It has also been found that in current equipment solutions, the amount of water produced from the spray tube is not sufficient to form a comprehensive water film on the surface of the roll.

In order to solve the above-mentioned problems, this application discloses a dragging element in contact with the roll surface placed in front of the scraper blade 20, to which water is sprayed or otherwise introduced. From the gill between the wound element and the surface of the roll, water can spread into an even layer. The advantage can be considered that in said solution there is no water splashing on the track even with large amounts of water. The trailing edge of the wound element can be shaped so that an opening gap 25 remains between the trailing edge and the surface of the roll. The arrangement increases the turbulence of the water and thus further the washing effect of the water. As all the water reaches the surface of the roll, a sufficient washing and lubrication result can be achieved with smaller amounts of water, which helps to reduce the mill's raw water consumption.

Within the scope of the invention, there is also a possible embodiment in which a rotating or dragging shark is arranged in front of or behind the dragging element. In order not to interfere with the passage of the web to the scraper and further to the 5C297 pulper in the head-pulling situation, the element is provided with an actuator with which the element can be lifted off the contact with the roll surface.

The wounding element can be, for example, thin steel, plastic, rubber, felt or the like 5 strips of sheet or fabric.

The apparatus according to the invention in connection with a scraper is mainly characterized in that the apparatus comprises a drag element in the vicinity of the scraper blade against the roll surface, which spreads a lubricating medium, preferably water, into a uniform thin film on the roll surface, resulting in smooth and minimized wear of the scraper blade.

Suitable chemicals can be added to the water to help keep the roll clean.

The method according to the invention is mainly characterized in that the method uses a flexible drag element against the roll surface, on the inlet side of which a lubricating medium is introduced with respect to the direction of roll rotation, preferably water 20 between the die and the roller surface, whereby a thin film of lubricating medium of the same thickness, preferably an aqueous film, is always produced on the scraper blade, whereby a smooth and minimized wear of the blade is preferably influenced.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows the position of the device according to the invention in connection with the upper roll of the quad press.

30

Figure 2A shows a side view of a device solution according to the invention.

3 c 'T ^ n 7 y w> /

Figure 2B shows the apparatus shown in Figure 2A arrow K direction.

Figure 3 shows an openable guitar structure at the end of a dragging element, which increases the washing effect of a lubricant, preferably lubricating water.

5

Figure 4 shows the stray structure behind the dragging element before the scraper blade.

Figure 1 shows the fitting of the apparatus according to the invention in connection with the upper roll of a quadruple press of a paper machine. The position of the equipment is shown with the bolt B.

10

Figure 2A shows a first preferred embodiment of the apparatus according to the invention. The image to is taken from the side in the machine direction. A lubricating medium, preferably in the form of a water jet Sj, is introduced into the surface T of the roll T via the spray pipe 10. The roller is rotated in the direction indicated by the arrow Lj. Water collects as a dam P in front of the drag element 11 according to the invention 15. The drag element is against the surface Τ 'of the roll T and distributes the lubricating medium evenly on the surface Τ' of the roll T. At its point of attachment to its body 11a, there is a longitudinal axis X of the drag element 11 at an angle α with the tangent tj drawn at the point of contact N of the drag element 11 and the roll T. The angle α is preferably in the range of 10-90 ° depending on the flexibility of the drag element. The water collects as a dam P in the space between the drag element-20 and the surface Τ 'of the roll T and discharges between the drag element 11 and the surface T' of the roll T as a thin film carried by the roll T. The drag element 11 thus provides a uniform water film 12 on the surface Τ 'of the roll T. The lubricating medium, preferably water, thus appears uniformly as an aqueous film on the blade K 'of the scraper K. Blade wear is thus minimized and even.

25

As shown in Fig. 2A, the drag element 11 is attached to its body 11a and the body 11a is. : on bearing means 1 lbl91 lb2 can be pivoted by an actuator 11c, preferably by a cylinder device. Thus, the drag element 11 can be lifted off the connection of the roll surface T ', for example during the head removal of the web. The apparatus then does not form an obstacle to the passage of the web 30 in certain driving situations to the scraper K and further to the pulper.

»· 4 53297

Figure 2B shows the apparatus of Figure 2A the direction of arrow D! direction. As shown in the figure, the drag element is preferably a flexible strip of steel, plastic, rubber or felt which smoothly abuts the surface Τ 'of the roll T. The actuator 11a is located at the other end of the body 11a of the drag element 11. The body 11a is mounted on a bearing-line 1 lb1.1 lb2 from both ends of the body 11a or, if necessary, also in between. The arm 1 le 'of the actuator 1 le is preferably connected to the pivot lever 1 Id.

Figure 3 shows the design of the end 11 'of the drag element 11. The end comprises an opening groove 13, whereby a vacuum effect and a swirl of the lubricant 12 10 is provided, which increases the washing effect of the lubricant.

Fig. 4 shows an embodiment of the invention in which the brush 14 is arranged after the drag element 11 (looking at the direction of rotation Lj of the roll T). The brush can be rotating or dragging, whereby the brush springs 14a1,14a2 ... increase the washing effect of the lubricant, preferably water 15. The brush structure may be located, as shown in the figure, on the discharge side of the drag element 11 or also in front of it before the dam P formed by the lubricating medium, preferably water.

Claims (7)

An apparatus in connection with a scraper (K) of a paper machine, the apparatus comprising means (10) for producing a lubricating medium, preferably water, on the blade (K ') of the scraper (K), the lubricating medium being guided on the roll and rotating the roll (T). K) for the blade (K '), characterized in that the apparatus comprises, in the vicinity of the blade (K') of the scraper (K), a drag element (11) dragging against the surface (Τ ') of the roll (T) and applying a lubricating medium, preferably water, into a uniform thin film (12) on the roll surface (Τ '), thereby providing even and minimized wear of the scraper blade (K') of the scraper (K). 10 Apparatus according to claim 1, characterized in that the drag element (11) is a plate-like part made of a flexible material, which in the water application situation is placed against the roll surface so that at its attachment point the longitudinal axis (X axis) of the drag element (11) and the drag element (11) and the angle (α) between the tangent (tj) drawn at the contact point (M) 15 of the roll (T) is in the range of 10 to 90 °. Apparatus according to one of the preceding claims, characterized in that the tip (1Γ) of the drag element (11) is spaced from the roll surface, thereby providing an opening groove and producing a vortex on the lubricating medium, preferably water, which increases the washing effect of the lubricating medium. Apparatus according to one of the preceding claims, characterized in that the drag element (11) is fastened to its body (11a), which body (11a) can be pivoted by means of actuators (11c), preferably a cylinder device, on bearing means 11b / 11bb. , in which case the drag element (11) can be lifted from the roller surface (Τ '). Apparatus according to one of the preceding claims, characterized in that the drag element (11) is made of leather or rubber or plastic or steel or felt as a sheet or fabric. 30 6 S2297 Apparatus according to one of the preceding claims, characterized in that the apparatus further comprises a shank (14), a drag element (11) and a scraper (K) in the area between the blade (K '). 5 Method for guiding a lubricating medium on a roll surface (Τ ') before a scraper blade, characterized in that a flexible drag element (11) is used against the roll surface, on the inlet side of which a lubricating medium, preferably water, between the drag element (11) and the surface (Τ ') of the roll (T) into a dam (P) and that the lubricating medium-10, preferably water, discharges as a thin film between the drag element (11) and the roll surface (Τ'), whereby the scraper (K) (K ') always produces a thin film of lubricating medium of the same thickness, preferably an aqueous film, whereby a uniform and minimized wear of the blade (K') is preferably influenced. 15 f 7 p - n. N 7> u L.> /