JPH03219168A - Sealing member between two flat surfaces - Google Patents

Abstract

PURPOSE: To quickly manufacture and exchange a seal member by constituting a filter press so that the depth of the gap between two seal elements connected to a seal member and arranged between two movable flat faces is reduced on the level of a web in the moving direction of the web of pulp. CONSTITUTION: A filter press consisting of a seal member comprises a frame 10, and it is provided with two wire parts, namely, a bottom part wire 12 and a top part wire 14. The bottom part wire 12 is held with rollers 18 in a press territory 16, and the rollers 18 are arranged continuously in the longitudinal direction of the press and relatively approched to each other. The roller group can be adjusted in nearly vertical direction, the inlet end of pulp is pivotally driven by the frame 10, and the roller group is arranged movably adjustingly in the vertical direction by an adjusting device 24 on the opposite end. In this way, the press territory 16 is arranged so as to be wedge-likely narrowed accordingly to the actual dimension of the press territory 16, and seal members are provided on both sides of the press territory 16.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a sealing element for a filter press or the like, in which the material to be processed is led between two wires, and said sealing element is therefore designed to ensure that the material is This prevents it from being discharged laterally between the spaces.

The seal member according to the invention is particularly useful in filter presses used to thicken pulp or sludge.

The sealing member according to the invention will be described later in connection with a filter press, consisting of a top wire arrangement and a bottom wire arrangement, between which the pulp to be thickened is led. The wires are supported by a plurality of successive rollers, the distance between which becomes narrower in the longitudinal direction of the machine. Said wire-supported rollers are preferably arranged such that the pressing area includes several prefusers that contribute to thickening the pulp, ie by forcing liquid out of the pulp via the wires. As a result of being pressed into such a narrow gap, the pulp naturally finds itself in the head which is discharged transversely to the direction of travel of the machine; A sealing device at the side is required for the pulp to be of uniform thickness, and it is most important to avoid draining from the side of the planosaur in the press area.

PRIOR ART Finnish patent application no. 840841 discloses a typical prior art seal for the wedge section or press area of a dewatering device. The sill member is arranged in a first location between the wires in the edge region of the press wire. The sealing member itself has one or two sealing tensions, which have the same thickness from one side to the other;
The sealing struts (one or two) are bent between the wires or are attached in a U-shape by special members between the wires. Both of these types of members are used where the ledges used have exactly the same thickness from one side to the other and whose outermost parts are fixed between metal or equivalent frames. characterized in that the frames are perpendicular to the plane of the wire and are attached to each other by bolts. Such an arrangement is possible, but only at the wide ends of the filter section, where the distance between the wires is a few cm. however,
In most of the press area, the distance between the wires is 20
mm or less, and even reaches 10 mm or less near the ends. In such areas, the sealing member had no clearance between the wires with respect to the metal frame or the bolts connecting the frames, and the sealing ledge had the same thickness from one side to the other. Left free and bent, the pressure exerted on this ledge can easily bend it, expanding the effective area between the wires towards the rear end of the press, thereby , the pressing effect or pressure increase effect at the edge is no longer the same as the effect at the center line of the press. In the worst case, the sealing member will break and the pulp will be freely discharged to the side of the machine.

One of the drawbacks of the prior art sealing members which the present invention seeks to solve is that, for example, no materials have been found that withstand friction and other stresses, resulting in a short lifespan of about two weeks. The point is that On the other hand, the market is very limited due to product development costs, so companies capable of developing products with sufficient strength are interested in developing materials that serve this very important purpose. Not yet. Such a sealing member is structurally complex because it has a large number of separate parts. Their lateral strength is poor, in other words they have to be very well supported, which means that the supporting members have to be placed very close to each other. There is.

Furthermore, since the sealing member described above is a flat plate with the same thickness from one side to the other, its sealing properties are not as good as they should be and this means that the sealing lip This is because the tip has the same strength as the rest of the seal ledge and therefore does not respond as easily to movement of the wire surface. On the other hand, a seal ridge having the same thickness from one side to the other will bend over as wide a section as possible under the pressure of the pulp against the wire surface, resulting in a seal ridge. parts will wear out more.

The disadvantages of the side sealing devices according to the prior art described above are eliminated by the sealing device according to Finnish Patent No. 76703, which leaves a gap between the lips, the width of which is equal to or smaller than the width of the sealing member. a rear part that communicates between two lips that vary in the longitudinal direction of the sealing member; It is characterized in that it includes support portions arranged so as to be connected to opposite sides of the rear portion, respectively.

This seal member was more durable than previous devices, cheaper to manufacture, and easier to replace.

However, the flexible plastic and rubber materials used in the devices according to the above-mentioned patents have been found to be an obstacle, because with long-term use they become brittle and their lip area This is because it begins to crack and gradually loses its sealing ability.

However, it should be noted that its service life is in any case variable compared to prior art seals, but not as long as desired, and entirely new devices have been developed for the side seals of filter presses. It has been done. It has been established that steel seals, which were previously quite unsatisfactory, provide the best results when properly designed, dimensioned and installed in the correct manner. Previously, steel was not used because it could wear out the wire at the contact surface. Previous concepts stated that the contact between the wire and the steel seal had to be straight to maintain a constant web width.

According to the invention, it is possible, if desired, to keep the width of the web constant and at the same time the contact surface between the wire and the seal is widened in area. . Furthermore, the contact angle between the seal and the wire is acute, thus resulting in a wiping and gradual contact between them.

The sealing device according to the invention communicates with the sealing member and has two
characterized in that the gap between the two sealing elements arranged between the two movable flat surfaces is reduced at the level of the pulp web in the direction of movement of the pulp web. There is.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sealing member according to the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, a filter press comprising a seal section (A) according to the present invention includes a frame 10, which is provided with two wire sections, namely a bottom wire 12 and a top wire 6'14. The bottom wire 12 is held in the press area 16 by rollers 18 which are arranged in succession in the longitudinal direction of the press and relatively close to each other. bottom wire 1
The tension adjustment No. 2 is performed by adjusting the position of the wire rotating roller 20 in a substantially horizontal direction. top wire 1
4 is held in the press area 16 by a set of rollers 22 which are adjustable in a substantially vertical direction, the artificial end of the pulp (on the right side of the figure) being pivoted relative to the frame 10; This group of rollers is also arranged to be adjustable vertically movable by means of an adjustment device 24 at its opposite end. Tension adjustment of the top wire 14 is performed by a wire rotating roller 26. The distance between the top wire and the bottom wire is approximately constant at the pulp artificial end, but is adjustable at the opposite end. The pressing area is preferably arranged in such a way that it becomes narrower like a wedge, depending on the actual dimensions of the pressing area. Sealing elements according to the invention are provided on both sides of this press area.

FIG. 2 is an end view of the sealing element 30, which shows the sealing element 36, 38 pressed between the supports ++ 32, 34 and the said supports by a screw or bolt 40.
It consists of. A feature of the invention is that the direction of the support member 32.34 is approximately the same as the direction of the wire 12.14, ie the direction of the wafer surface of the valve. The support members 32 and 34 are preferably metal ledges. The sealing elements 36 and 38 are preferably made of steel, especially spring 1.
2a, which is bent so as to form an angle p between the sealing elements 36 and 38 which are clamped together. Therefore, each sealing element is preferably bent to I3/2. It can also be seen in FIG. 2a that the angle between the seal elements 36 and 38 remains constant over the entire length of the seal, which is referred to as prior art and as the basis of the present invention. In contrast to the referenced Finnish patent no. 76703, in this patent the angle varies uniformly over the entire length of the seal. FIGS. 2a and 3 illustrate the characteristic features of the invention relating to the acute or gradual wiping contact angle between the seal and the wire. 2a and 3 also show the sealing element 36 measured from the point of rotation, i.e. from the inner edge of the support member 32, 34 to the tip 1 of the sealing member.
The width between and 38 is the direction of wire movement (arrow B in Figure 3).
and thus the sealing elements 36 and 3
The distance between the tips of 8 also shows a similar decrease depending on the distance between the wires.

FIG. 3 also shows how the edge of the sealing element 36 contacts the top wire moving in the direction of arrow B.
It shows whether it approaches 2. In other words, the contact surface between said edge and the wire is not a straight but flat surface, the width of which corresponds to the variation of the width of the sealing element 36 projected in the direction of the plane of the wire. By the same reasoning, the contact angle between the sealing element and the wire is an acute angle, and the contact method is also a wiping contact.

FIG. 2b shows a second preferred embodiment of the invention, in which the distal end portion of the sealing element is bent to coincide with the plane of the wire, thereby The contact is gentler and the contact area is larger than in the embodiment of FIG. 2a.

The purpose of the support members 32, 34 themselves is to provide a sealing member with the necessary lateral strength, which reduces the thickness of the pulp that is to be thickened.

The number of support devices is of great importance, both to maintain it constant over the entire length of the resting area and also to ensure that the sealing elements, which do not need to be supported by support devices, are installed very close to each other. It is directly proportional to the amount of work required for seal member modification. On the other hand, the support device shown in the figure allows vertical bending of the sealing member,
This can sometimes occur if the wire direction changes slightly. Such bending is not possible with prior art sealing members, where the tightening for the seal bulge is such that the device is made of metal or an equivalent material and that it resists bending in said direction. It was impossible because of his position.

A preferred material for the sealing element in a sealing member according to the invention is steel, which has frictional properties that are a good match for plastic wire. Hane 1 Oka has been found to be most suitable for this purpose. However, several other materials having suitable strength and friction properties may be used as well.

Said support member is preferably a flat metal bar, which allows the clamping for the sealing member to be easily positioned relative to the device or support device. In the test device, a special quick-separation element was used as a clamping and supporting device for quick replacement of the seal +4.

As can be seen from the foregoing description, a completely new type of seal assembly has been developed in terms of operation when a stationary seal of variable dimensions is required that can be placed between two moving surfaces. . The sole element according to the invention reduces or minimizes the weaknesses of prior art solutions by maximally simplifying the element, thereby allowing rapid production and replacement of the seal element. There is.

[Brief explanation of drawings]

FIG. 1 is a schematic overall side view of a filter press including a sealing member according to the invention; FIG. FIG. 2b is an end view of a seal member according to a second preferred embodiment of the invention, and FIG. 3 is a top view of the embodiment according to FIG. In the figure, 30...Sealing member, 32.34...Seal protrusion 36.38...Sealing element.

Claims (6)

[Claims] (1) A seal member between two flat surfaces, wherein the flat surface moves relative to the seal member, and the distance between the flat surfaces changes in the longitudinal direction of the seal member. In the sealing element between two flat surfaces, the sealing element is attached to the frame of the machine in its support structure, and the two sealing elements connected to the sealing element leave a gap between them. , and the depth of the gap between the two sealing members at the level of the web of pulp is
A sealing member between two flat surfaces, characterized in that it decreases in the direction of movement of the pulp web. (2) In the sealing member according to claim 1, the bottom angle (β) of the gap between the two sealing members is maintained constant over the entire length of the sealing member (30). Seal member between surfaces. (3) A sealing member according to claim 1, wherein the sealing elements (36, 38) define a gap therebetween, and the sealing element (36, 38) defines a gap therebetween, the sealing being measured from the support structure towards the distal end of the sealing element. A sealing member between two flat surfaces, the width of the element narrowing in the direction of movement of the pulp web. (4) In the sealing member according to claim 1, the support structure of the sealing member (30) consists of two protrusions (32,
34) between two flat surfaces, between which one edge of the sealing element (36, 38) is pressed. (5) In the sealing member according to claim 1, the portions of the edges of the sealing elements (36, 38) arranged opposite to the wire are bent approximately to the level of the wire. Seal member between the flat surfaces. (6) A sealing member as claimed in claim 1 between two flat surfaces, wherein the material of the sealing elements (36, 38) is metal, preferably steel.