FI75499B - PLATTFILTER. - Google Patents

Description

1 τ „4 75499

The invention relates to a plate filter with in particular horizontally arranged collapsible filter plates, between which an endless filter strip is passed and turned in the other direction over the swivel rollers. a closure device with lower and upper lids, one of which is movable in the other direction, wherein the filter plates for backlash-free control are provided with body portions laterally over at least one sliding direction and one of the lids is connected to the plates extending over the height or length of the filter plates; included input and output lines.

A plate filter of this type is described, for example, in DE-A-2,421,781 and GB-A-2,064,973. In this case, an endless filter strip 20 is passed in each case between the two filter plates and a filter comb is formed between the two adjacent filter plates.

To remove the filter cake on top of the filter strip, a closing device is opened, as a result of which the filter plates can be separated from each other by a predetermined dimension. The filter cakes on top of the individual filter strip portions can then be moved away by suitable displacement of the filter strip.

In the known plate filter, individual filter plates are suspended on a support plate above the upper filter plate. The support plate is attached to the frame and a lifting table arranged on the bottom of the filter plates compresses the filter plate together by means of a hydraulic cylinder. The coupling devices between the individual filter plates consist of joints and a support plate. In this way, each filter-35 tin plate in the open state depends on the slime that they affect the filter plate above its weight. The entire weight is led to the support plate via articulated chains. When the plate filter is closed, the filter plates are then placed on top of each other from below and the force is dissipated o tm λ 75499 above the support plate and the frame. i -τ s s

The inputs to and exits from the individual filter plates generally take place above the loops arranged at the edge of the filter plate, which in the collapsed state of the plate-5 filter are formed by vertical tubes.

Known plate filters have various disadvantages. Thus, for example, the suspension of the filter plates on the support plate and the columns is relatively cumbersome.

10

By hanging the filter element downwards via the oil chain, the mutual traction of the elements must be released when replacing the plate filter. This causes a significant increase. A further disadvantage is that the articulated chain has no revitalizing support for the filter plates. For this reason, there must be special structures that receive the transverse forces or similarly avoid the displacement of the filter plates.

The object of this invention is therefore to provide a plate filter of the above-mentioned type which, using as few components as possible, is simple and reliable, in particular which ensures precise and interference-free control of the filter plates.

According to the invention, this object is achieved in that the closing device has spindles 25 running vertically next to the filter plates on the sides, the upper cover being movably guided by the spindles and the lower cover fixedly arranged in the area of the other end of the spindle and laterally overhanging and sliders through which the filter plates are guided substantially without play in at least one lateral direction between the spindles 30.

Thanks to this embodiment, completely special columns can be dispensed with. By suitable movement of the spindle nut, which can take place e.g. jointly by means of a roller chain drive, the filter plates are opened and closed.

Thanks to this embodiment, only a few components are required and there are no side obstacles due to the prior art frame columns 35 3 75499 1. The drive may be designed to be easily accessible and may be outside the contamination zone.

According to a preferred embodiment of the invention, the closing device can be formed in such a way that the upper cover guides are provided with torsionally rigidly spindle nuts which, when used synchronously, raise or lower the cover by the threads of the spindles. In addition, the arrangement may be such that four spindles are arranged in the area of the corners of the filter plates and the frame parts are side branches. Advantageously, the 1-piece pieces are connected to the roller-10 chain and, in addition, in such a way that the slide pieces perform slut control of the filter plates in the direction in which the roller chains do not act.

The basic embodiments of the invention are described below with reference to the drawing.

Figure 1 shows a plate filter in a front view.

Figure 2 shows the overlapping filter plate (reduced).

20

Figure 3 shows an enlarged view of the coupling device formed by the roller chain.

Figure 4 shows an enlarged view of a switching device with a control bolt.

Figure 5 shows the solution according to Figure 4 in a front view.

Plate filters of this type are generally known, which is why only the essential parts of the invention will be described in more detail below. A plate filter with horizontally superimposed filter plates is shown, but it is self-evident within the scope of the invention that an embodiment of a plate filter with vertically successive filter plates is also possible.

The plate filter has a plurality of superimposed filter plates 1, the lower filter plate 1 being on the lower cover 2, while the upper filter plate 1 is on the upper cover 3. Vertical spindles 4 are arranged on the sides in the area of the four corners of the filter plates. in the body part or in the cover 2. The lower cover 2 is made fixed. The upper cover 3 is provided with bores through which the spindles 5 4 are inserted.

The upper cover 3 is now moved up or down by means of spindles 4 to open and close the filter plates. There are several possibilities for this. Thus, for example, the spindle nut 4a may be provided with a half-way clamp on the upper-10 side of the cover, and four spindle nuts are suitably used. Of course, it is also possible to use the spindles themselves, in which case the spindle nuts 4a are then torsionally connected to the cover 3.

Figures 1 and 2 and enlarged Figure 3 show in principle a coupling device for individual filter plates consisting of a roller chain 5. In each case, two roller chains on each side are arranged at a distance from each other. Each roller chain consists, as usual, of a side plate and bolts on which the connecting plates are suspended. The chain is preferably formed continuously and in each case purls-20 are pressed with press pieces 6 against said filter plate. Figure 3 also shows the filter strip 7. Figure 2 shows its position in broken lines. The filter strip 7 can be divided into several individual, interconnected strip sections 7 '. The strip parts 7 'are connected to each other by springs 7a.

25

It can be seen from Figure 2 that the filter plates are guided in a horizontal direction, certainly in both directions. Each filter plate 1 is framed on two opposite sides by frame parts 8 which are fixedly connected to said filter plate. The frame parts 8 pass a small distance 30 past the spindles 4. In each case, in the region of the spindles, a slider 9 is connected to the frame part 8, which can in each case slide on the spindle 4.

The spindles 4 have a thread in the region of the maximum setting distance of the cover. By means of the reading pieces 9, the filter plates 1 are fastened in a backlash-free manner transversely to the direction of travel of the strip. In the other direction, the roller chains 5 provide sufficiently precise control.

Il 5 75499 1 Instead of roller chains 5, it is desired to use simpler coupling devices between the filter plates which cannot receive any lateral forces, so that the frame parts 8 can be provided with additional initial frame parts 10 in the form of projections. If the sliders 11 are arranged between the projections 10 and the spindles A in the same way, then a correct control of the filter plates in both directions is also achieved.

The suitably extended frame parts 8 can each be provided with a turning roller 12, by means of which the direction of the filter strip is suitably turned.

Fig. 2 shows in the upper area, in broken lines, the swivel roller and both frame parts for the filter plate below it.

Figure A shows another switching device for the filter plates 1. In this case, the control bolts 13 and the control lilac plates IA serve to precisely control the slabs of the t-plates. In each case, guide lattice plates IA are fastened near the corners of the filter plate 1, and the two guide lattice plates are always arranged in a pair of superimposed transitions in the vertical direction. Through the bores in the guide connection plates, the guide bolts 13 are inserted in a vertical direction. In order to determine the exact opening distance, the control bolts 13 are then provided with flat ends 15.

In general, a guide lattice plate IA is arranged for each filter plate in the region of its corners. In each case, the guide lattice plates IA on top of each other and on the bottom of the adjacent filter plates are arranged in a generally sliding direction due to the use of space. This is shown in Figure 5.

Each filter plate 1 is provided with inlet and outlet lines 16, not shown in more detail, for the hose through which the suspension is fed. In the dewatering by means of a pressure-loaded spray film, the filtrate behind the filter strip 7 is then removed in the usual way through the grooves in the filter plate. The filter cake collected on the filter strip 7 is moved laterally outwards after the filter plates 1 have been moved apart by lifting the lid 3 (e.g.

35 position shown in Figure 3). In addition, suodatln transferred to an endless tape 7 is suitably eg. In the direction of the arrow (Figure 2) slightly more than one filter plate (suodatinnauhaosa 7 ') length. In this case, the filter cake 6 75499 1 falls at the respective turning rollers 12. The endless filter strip 7 then moves back again or it moves completely forward in time so that each strip part 7 'moves inside the next filter plate 1.

5 10 15 20 25 30

II

35

Claims (3)

75499 A plate filter, in particular with horizontally arranged compressible filter plates (1), between which an endless filter strip 5 is passed and turned in another direction over the swivel rollers (12) »a switching device between the filter plates -closure device for plates with a lower and an upper lid (2,3), one of which is movable in the other direction, the filter plates 10 (1) being provided with body parts (8,10) laterally overhanging in at least one sliding direction and wherein one of the lids (3) is connected to a control extending over the height or length of the filter plates, respectively, and the filter plates comprise inlet and outlet lines (16), characterized in that the shut-off device , so that the upper cover (3) is guided by the spindles to be moved! and that the lower cover (2) is fixedly arranged in the region of the other end of the mandrel (4) and that the laterally upper body parts (8, 10) are arranged and connected to sliders (9, 11) through which the filter plates (1) are guided substantially backlash-free in at least one sliding direction between the spindles (4). 1 Claims Plate filter according to Claim 1, characterized in that torsionally strong spindle nuts (4a) are provided for guiding the upper cover (3), which, when used synchronously, raise or lower the cover by the threads of the spindles (4). Plate filter according to Claim 1 or 2, characterized in that four cones (4) are arranged in the region of the corners of the filter plates (1) and the frame parts are side branches (8, 10). 35