FI92501B - Construction in connection with the feeding pipe of the distribution boom in the inlet box of a paper machine - Google Patents

Description

92501

Structure associated with the paper machine headbox manifold feed pipe

Construction of an account for the use of paperwork in the paper machine 5

The invention relates to a structure related to the feed pipe of a paper machine headbox manifold.

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When tilting the headbox of a paper machine, the feed tube is provided with device arrangements that allow the feed tube to rotate. It has been known to form the feed tube at least for a distance from a resilient elastic material which allows the feed tube to rotate while the other end of the elastic structure remains in place. A disadvantage of said structure 15 is the poor durability of the material. When the headbox is tilted, the head associated with the headbox size has moved along a larger path while the other end of the feed tube remains in place. The material is subjected to high torsional stress, which has limited the service life of the pipe.

20 The present application seeks to remedy the above problems. The application discloses a structure which avoids torsional stresses entering the supply pipe. According to the invention, it is realized to form in the supply pipe such a connecting structure comprising a connecting flange, the central axis of which is parallel and coincident with the geometric pivot axis of the headbox. The flange connection is thus made 25 articulated, which allows the supply pipe to pivot about the central axis of the flange. When the headbox is turned, the supply pipe associated with the headbox manifold rotates with a radius R about the geometric central axis of the flange. The said structure avoids: the use of flexible connecting pipes.

2 92501

The connecting structure of the paper machine headbox supply pipe according to the invention is mainly characterized in that the central and rotational axes of the connecting flange are substantially the same as the tilting axis of the paper machine headbox.

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 is a side view of a paper machine headbox.

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Fig. 2 shows a connecting flange according to the invention in connection with a supply pipe connected to a headbox manifold, seen from the direction Kt of Fig. 1.

3 shows a connection flange of the arrow K2 in Figure 2 view.

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Figure 4 is a side view of the flange structure seen from the direction K3 of Figure 3 and partly in cross-section.

Figure 5 shows on an enlarged scale the area A of Figure 4.

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Figure 1 is a side view of a paper machine headbox. Paper machine

. I I

the headbox can be tilted by means of the actuator T. The geometric pivot axis of the headbox of the paper machine in the lug C is marked in Fig. 1 by the letter Xj. The pulp supply pipe Sj is connected to the headbox P of the paper machine. The supply pipe Si 25 comprises, as a pivot point allowing the pipe to rotate, a connecting flange 10 with which the supply pipe S1 is connected to the inlet pipe S2.

Figure 2 shows a supply pipe Sj associated with a headbox P, which is connected to an inlet pipe S2 by a flange connection 10 allowing the rotation of the pipe St. The geometric center and axis of rotation X1 of the connecting flange 10 is the same as the tilt axis X2 of the headbox of the paper machine. The axis Xt of the flange connection is thus coincident with the tilt axis X2 of the headbox.

3 92501

When the supply pipe S! is connected to the headbox P, the portion S adjacent to the headbox P of the supply pipe is located and at a distance R from the central and axis of rotation Xj of the connecting flange 10. When the headbox P is tilted, the pipe section S moves around the axis X2 and with a radius R around the axis Xj, the connecting flange 10 allowing rotational movement. Arrow Lj indicates 5 pulp flow directions.

3 shows a liitoslaipparakenne the direction of arrow 10 of Figure 2 from the direction K2. The connecting flange 10 comprises a connecting collar 11 adapted to be openable and adapted to be double-sided comprising collar halves 12a, 12b articulated to each other 10 at a hinge point 13. The connecting collar 11, its collar halves 12a, 12b are connected together by a screw 14 inserted in the collar portions. through the lugs 15a, 15b.

Figure 4 shows the flange of the arrow K2 in Figure 3, a side view and partly in section. Figure 5 shows the area A of Figure 4 on an enlarged scale. The tubular portion Sj is associated with a shoulder-flow end portion Sf and the tube portion S2 is associated with a shoulder-flow end portion S2 ', respectively. The side surfaces Ej and E of the shoulder end portions Sj ', S2'? are at an oblique angle to the direction of the radius Rj of the joint, whereby by turning the screw 14 the force with which the tubes Sj, S? pressed against each other. The tightening force is selected so as to allow the tube S1 to rotate relative to the tube S2. The side surfaces act as wedges. with the side surfaces U1 and U2 of the groove 11 of the collar. The connecting collar 11 comprises a cross-sectional shape of the groove U corresponding to the appearance of the shoulders Sj \ S2 '. By connecting the halves 12a, 12b of the collar 11 to each other with a screw 14, the pipe parts S1, S2 to be connected are pressed against each other and held together. However, the connection allows the pipe section Sj 25 to rotate.

The pipe Sj provided with the end shoulder Sf comprises a groove V on the end face Nj of the shoulder Sf, to which the pipe part S? the shoulder end S2 'is adjustable so that the end face shoulder D on the end face N2 of the shoulder end rests in the groove V.

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Claims (5)

92501 The patent claims A structure associated with a pulp supply pipe of a paper machine headbox manifold, wherein the pulp supply pipe (Sj) comprises a connecting flange (10) between the supply pipe 5 (S1) and the inlet pipe (S2) and said connecting flange (10) comprises a structure (Sj ') connected to the supply pipe (St). ) adapted to rotate when the headbox (P) is tilted relative to the structure (S2 ') associated with the inlet pipe (S2) of the connecting flange (10), characterized in that the central and rotational axes (Xj) of the connecting flange (10) are substantially the same as the paper machine headbox P) tilt axis (X2). 10 A structure according to claim 1, characterized in that the connecting flange (10) comprises a shoulder end portion (Sj ') associated with the supply pipe (SL) and a shoulder end portion (S2') associated with the inlet pipe (S2)> wherein the shoulders (S1 ', S2') are connected by a connecting collar (11) comprising a groove (U) and having a cross-sectional shape compatible with the shoulder shapes (Sj \ S2 '). A structure according to claim 2, characterized in that the connecting strap (11) comprises collar halves (12a, 12b) connected together by a screw (14), the force with which the shoulders (S1,, S2) are adjusted by adjusting the tightening force of the screw (14). ') 20 is pressed against each other, however, the tightening is such as to allow the supply pipe (Sj) to rotate about the central and the axis of rotation (Xj). » Connecting structure according to one of the preceding claims, characterized in that the side surfaces (Ej1) of the shouldered end portions (Sj *, S2 ') are inclined at an angle to the radius (Rj) of the connection, which force can be adjusted by turning the screw (14), by which the tubes (Sj, S2) are pressed against each other with the side surfaces (Ej.Ej) of the shoulders (Sj ', S2') acting with a wedge effect with the cross-sectional shape of the groove (U) of the connecting collar. Structure according to one of the preceding claims, characterized in that the pipe (Sj), its end shoulder (Sj ') has a groove (V) on its end face (Nt) into which the shoulder end (S2') of the pipe section (S2) to be connected can thus be placed. that the end face shoulder (D) on the end face of the shoulder end (S2 ') settles in the groove (V).