FI68689B - LAEPPVAEGGSKONSTRUKTION I INLOPPSLAODAN I EN PAPPERSMASKIN - Google Patents

Description

68689

Paper machine headbox lip wall structure Läppväggskonstruktion i inloppsladan i en pappersmaskin

The invention relates to a lip wall structure of a paper machine headbox, in which one or both lip walls of the headbox lip channel, in particular the upper lip wall, are arranged to be movable substantially in their plane direction and rotatable about , consisting of one or more articulated bodies bounded by an articulated surface in an articulated housing fixed to the headbox structures and having a sliding groove in connection with the articulated bodies or body 10.

In order to adjust the dimensions of the lip opening of the headbox, the upper lip wall delimiting the lip channel is generally arranged to be displaced in the direction of its plane and pivoted about a horizontal joint 15 arranged in connection with its rear edge. Mechanically, these transfer and turning movements are carried out with various screw gears or the like.

As is known, a round-cross-section hinge part is formed on the rear edge of the upper lip wall, which can be pivoted in its hinge housing. Said 20 articulated housings are generally arranged in a prior art in the form of a slide which can move into the body parts of the headbox in a fixedly arranged slide housing when the upper lip plate is moved in the direction of its plane. One of the known structures described above is disclosed in the applicant's Finnish patent application No. 802695. However, said known lip-back structure-25 has a rather complex implementation and has several parts. Another disadvantage is that the complex structure causes sanitation problems in the headbox.

It is an object of the present invention to provide a new lip wall structure, in particular an upper lip wall structure, in which the above-mentioned drawbacks are avoided.

2 68689

In order to achieve the above and later objects, the invention is mainly characterized in that the rear end of the upper lip wall is slidably arranged in its plane in a sliding groove delimiting between the projections of said pivot-sliding joint member or members.

In the following, the invention will be described in detail with reference to an embodiment of the invention shown in the figures of the accompanying drawings, to the details of which the invention is in no way narrowly limited.

10

Figure 1 shows a machine direction vertical section of the lip part of a headbox with a lip-wall structure according to the invention.

Figure 2 shows section II-II in Figure 1.

15

Figures 1 and 2 show the lip portion of a paper machine through which a pulp suspension jet is fed to a forming wire (not shown). The lip portion comprises a fixed lower lip wall 10 and an upper lip wall 11 moving substantially in its plane and rotating about a horizontal axis. The walls 20 and 11 define a lip channel 12 which converges in the flow direction F of the mass suspension terminating in the lip opening A. Figure 1 shows a turbulence generator before lip channel 12. , consisting of plate pieces 19a and 19b extending over the entire width of the headbox, which are tightly opposite. These plate pieces have a series of flow openings-25 and 20 through which the pulp suspension is discharged from the equalization chamber 33 before the turbulence generator into the lip channel 12.

The fine adjustment of said lip opening A is performed by means of a tip strip 14. The tip strip 14 is attached to a plurality of parallel vertical supports 13 connected to adjusting spindles known per se (not shown). Attached above the upper lip wall 11 is an upper lip beam 15 having two or more helical gears 17 secured via flanges 16. These helical gears 17 are secured on one side by articulated pins to flanges 18 which in turn are secured 35 to the frame structures 30 above the headbox.

According to the invention, the upper lip plate 11 is fastened with a new sliding fit to a horizontal joint in connection with its rear edge, around which the upper lip plate 11 can be rotated by means known per se (not shown). Said joint consists of two joint bodies 23 and 24 fixed to each other by screws 25. The articulations 23 and 24 extend over the entire width of the headbox and have two fastening screws 25 in parallel and several in succession in the transverse direction of the paper machine. The articulated bodies 23, 24 have an outer surface 22 in the form of a circular-cylinder part, which acts as an articulated surface. Turbu-10 lenssigeneraattorin second plate body 19a is machined corresponding to the surface 22 of the sliding surface 32, which forms a joint housing, wherein the formed bodies 23 and 24 of the joint can pivot in the direction of arrow D. Said joint is locked in place by plate pieces 21 in succession in the transverse direction of the paper machine. The plate pieces 21 are attached to the part 19a of the rue-15 knife 29.

The hinge pieces 23 and 24 define a sliding groove 28 between them, in which part 11a of the upper lip plate 11 can be accommodated by a suitable sliding fit. The part 11a has a transverse groove with a sealing strip 27, the purpose of which is to prevent the pulp suspension 20 from entering the sliding surfaces of the part 11a. The groove of the hinge piece 23 has a corresponding sealing strip 26. If necessary, an intermittent rinsing of the water 28 can be arranged, preferably through the hinge opening at the bottom of the sliding groove 28, in order to keep the hinge opening 28 open and clean.

When the screw lip 17 moves the upper lip plate 11 in its plane direction V, the horizontal dimension B of the lip opening A changes, which has an effect on the operation of the lip opening A, in particular in the direction of the mass jet. In this case, the part 11a of the lip plate 11 can slide in the groove 28 between the joint pieces 23 and 24, in connection with which the joint 23,24 can even turn slightly if necessary. A lip of the opening 30 of the TAA korkeusmit-H by turning ylähuulilevyä 11 articular surfaces 22,23 formed by a horizontal pivot in the direction of the arrow C by known means (not shown). In this case, the upper lip 11 does not generally move in its sliding fit 11a, 28.

35 The joints 23 and 24 are preferably made of bronze to prevent cutting. The lip plate 11 and the plate parts 19a and 19b as well as the plate pieces 21 and the joint piece 23 are preferably made of acid-resistant steel. The sliding joint according to the invention 4 68689 is not subjected to large forces, and the joint is shaped in such a way that it provides good support for the lip plate 11.

If, instead of the upper lip plate 11, the lower lip plate 10 is arranged to be adjustable, the sliding joint described above can also be applied in connection with the lower lip plate 10 or the like.

The invention can also be used in headbox structures which differ substantially from those described above and in which the lip channel 20 is, for example, upwards or downwards or even vertical. In this case, the sliding joint 11a, 28 according to the invention can be applied in connection with either one or both lip plates.

The lip structure according to the invention is simple and comprises relatively few parts and is also inexpensive to manufacture. Another advantage of the flow technology is that there are fewer seams collecting pulp fibers than before.

The following claims set forth within the scope of the inventive idea, the various details of the invention may vary and differ from those described above by way of example only.

Claims (7)

1. Lip wall construction in the inlet housing of a paper machine with which one or both of the lip walls (10, 11), in particular the upper lip wall (11), of the inlet housing's lip channel (12) is movably arranged substantially in the direction of the smooth plane (V) and about the horizontal joint provided 1 with its rear edge for controlling the center (H, B) of the lip opening (A), in which construction is arranged in communication with the rear part (11a) of the upper lip wall (11). a sliding joint, which consists of one or more guide members (23,24), which confine themselves to the guide surface (22), which is located in the guide core (21,32), which is fixedly positioned in the inlet housing structures, and in connection with which guide members (23.24) or piece are provided with a sliding plate (28), characterized in that the rear end of the upper lip wall (11) is slidably arranged in the direction of its piano in a sliding plate (28) which is confined between the protruding parts of the guide piece (s) ( 23.24) in said reversing slide. 2. An inlet slide lip assembly according to claim 1, characterized in that said reversing slide joint consists of two hinges (23.24) towards each other, on the outer surface of which is a hinged surface (22) having the shape of a circular cylinder part, and a sliding slide (28). ) confines itself between the protruding portions of the guide members (23, 24), in which the sliding end (11a) of the lip wall of the inlet shaft especially overlap wall (11) or the corresponding projecting part is slidably fitted in the direction of its piano. 25 3. Inlet slide lip construction according to claim 2, characterized in that in the opposite surfaces of said guide pieces (23.24) there is a spar-bending fitting (31) which directs the guide pieces (23.24) in relation to each other. 30 4. Inlet slide lip construction according to claim 1,2 or 3, characterized in that said guide pieces (23,24) extend along the entire width of the inlet sleeve. 5. Inlet slide lip construction according to any one of claims 1-4, characterized in that said reversing slide joint is fixed p.