CH669123A5 - Filter press. - Google Patents

Description

669 123

PATENT CLAIM Filter press, containing a set of filter plates (1), which are arranged between a counter pressure plate (2) and a pressure plate (3), longitudinal bars (4), which the counter pressure plate (2) with a clamping device (5) for clamping the filter plates ( 1) connect, a device (7) for moving the filter plates (1), a device (15) for discharging the residue with racks (17) which are arranged to be vertically movable and whose teeth are directed upwards, side lugs (6) Filter plates (1) which engage the teeth of the toothed racks (17), characterized in that the lengths of the toothed racks (17) of the filter press are at least equal to the path length of a filter plate (1) and additional rods (19) are provided arranged below the racks (17) and connected to them in an articulated manner by means of brackets (20), the racks (17) being provided with articulated spring-loaded stops (24), but the additional racks (19) Rizontal movable mounted and arranged in longitudinal guides (21) with limiters (22,23) which cooperate with the ends of the additional rods (19).

DESCRIPTION

The invention relates to a filter press according to the preamble of claim 1. Such filter presses are used for filtering slurries or wastewater, as are particularly found in the chemical, petroleum and coal industries.

A filter press (see JA patent no. 91 812, cl. BOI D 25/12; BOI D 25/32, 1981) is known which has a set of filter plates which are arranged between a counterpressure plate and a pressure plate, a tensioning device and Longitudinal bars connecting the counterpressure plate with a tensioning device, a device for moving the filter plates and a device for discharging the residue, which have toothed racks with downward-pointing teeth, which move in guides along the axis of the filter press, at the beginning of the discharge of the residue descend to the lower end position and, after the discharge of the residue has ended, rise to the upper end position.

The known filter press is characterized in that the discharge of the residue is carried out during the displacement of the filter plates and their turning, which is caused by the interaction of rollers arranged in the upper part of the filter plates with the toothed racks, whereby a complete discharge of the residue cannot be guaranteed ; in addition, the guides of the discharge device are arranged above the filter plates, which makes operation and repair more difficult.

Another filter press (see JA patent no. 166 877, cl. BOI D 25/12, 1977) contains a set of filter plates which are arranged between a counterpressure plate and a pressure plate, longitudinal bars which connect the counterpressure plate to a clamping device, one Device for moving the filter plates and a device for discharging the residue with racks, which extend over the entire length of the set of filter plates, with the teeth of the racks pointing upwards and the racks being arranged to be vertically movable, such that the side lugs of the filter plates interact with the teeth of the racks. When the residue is discharged, the racks are brought into the upper end position so that the filter plate is in their

Displacement moves with their side approaches over the inclined surface of the teeth and falls abruptly after reaching the tooth tip, whereby the plate is shaken and the residue is separated. A special drive for lifting and lowering the racks is provided in the discharge device, which complicates the construction of the filter press and increases its metal content.

Since the racks are arranged over the entire length of the set of feed plates, the filter plates are at different heights after being moved to remove the residue. For this reason, an additional time is required for the individual movement of the plates in their starting position, which leads to a reduction in performance.

The invention has for its object to provide a filter press that ensures a complete discharge of the residue with a simple construction.

The object is achieved by the features specified in the characterizing part of claim 1.

Such a construction makes it possible to guarantee a guaranteed discharge of the residue and to significantly reduce the metal content by reducing the length of the toothed racks and by excluding special devices for lifting the toothed racks and a system for controlling them. The fact that the racks of limited length can move in guides along the set of filter plates makes it possible to manufacture filter presses from a larger filter area.

The invention is explained below on the basis of specific exemplary embodiments with reference to the attached drawings, which show according to the invention:

Fig. 1 general view of a filter press;

2 general view of the device for discharging the residue when interacting with the slides of the device for moving the plates;

Fig. 3 position of the racks during the displacement of the filter plates when discharging the residue;

Fig. 4 position of the racks after the discharge of the residue has ended.

The filter press contains a set of filter plates 1 (FIG. 1) which are arranged between a counter pressure plate 2 and a pressure plate 3. The counter pressure plate 2 is connected by means of longitudinal bars 4 to a tensioning device 5, which can be carried out hydraulically or mechanically. The filter plates 1 are supported with their side lugs 6 on the longitudinal bars 4 and are moved along the axis of the filter press by means of a device 7 for displacing the filter plates 1. The device 7 for displacing the filter plates 1 comprises a reversing drive with chain wheels 8, drive chains 9, tensioning mechanisms 10, slides 11 (FIG. 2). Each of the slides 11 contains a body 12 on which stops 13 and drivers 14 are articulated, which move the filter plates 1 by working with side lugs 6. A device 15 for discharging the residue (Fig. 1) consists of two parts, each part of which has a housing 16 (Fig. 3) in which a rack 17 with teeth 18 and an additional rod 19 are arranged, which are connected to the rack 17 is articulated by means of tabs 20. The length of the toothed racks 17 corresponds at least to the path length of a filter plate 1 and they can move vertically in the housings 16; the additional rods 19 are arranged to be horizontally movable and their end parts emerge from the housings. The rods 17 and 19 are connected to one another in such an articulated manner that in the one end position of the additional rods 19, the toothed racks 17 assume the lower end position and their teeth 18 are arranged below the upper edge of the walls of the housing 16, as in FIG. 4

2nd

5

10th

15

20th

25th

30th

35

40

45

50

55

60

65

3rd

669 123

is shown, while in the other end position of the additional rods 19, the racks 17 are in the upper end position, as shown in Fig. 3; the teeth of the racks 17 protrude above the upper edge of the walls of the housing 16. The housing 16 of the device 15 for discharging the residue are movably arranged in longitudinal guides 21 fastened to the longitudinal bars 4.

The guides 21 have limiters 22 and 23 (FIG. 4) which cooperate with the ends of the additional rods 19. The side lugs 6 (FIG. 3) of the filter plates 1 are in engagement with the teeth 18 of the toothed racks 17 when the residue is discharged. Spring-loaded stops 24 are articulated on the toothed racks 17 and serve to fix the discharge device 15. The tooth gaps of the toothed racks can be filled with an elastic material 25 for damping the shocks of the filter plates 1.

On the housing 16 approaches 26 and 27 and on the carriage 11 (Fig. 2) pawls 28 are provided, each of which is mounted between the approaches 26 and 27 and cooperates with them during the movement of the carriage 11.

The filter press has the following mode of operation: at the beginning of the process, the set of filter plates 1 is in the right end position and the discharge device 15 (FIG. 1) is also in the right end position. When you turn on the clamping device 5, its working organ, z. B. the piston rod of a hydraulic cylinder, on the pressure plate 3, which moves the set of filter plates 1 in the direction of the counter-pressure plate 2 and compresses them to a certain compressive force required for the hermetic sealing of the space between the plates 1, 2, 3 is whereupon a filtering suspension is fed to the filter press. After the filtration has ended, the pressure plate 3 is withdrawn from the set of filter plates 1 by means of the clamping device 5. Then the device 7 for moving the filter plates 1 is activated. The pawls 28 of the slides 11 (FIG. 2) work together with the lugs 26 of the housings 16 of the discharge device 15 and move them in the direction of the first filter plate 1, the toothed racks 17 being in the upper end position, as in FIG. 3 is shown; the articulated spring-loaded stops 24 are supported against the pressure plate 3 or further against the side lugs 6 of the filter plate 1, as a result of which the discharge device 15 is fixed.

The stops 13 (FIG. 2) of the slides 11 interact with the lugs 6 of the filter plates 1, the drivers 14 engaging with the same side lugs 6, so that the slides 11 are reversed at this moment. The slides 11 move towards the pressure plate 3 by moving the first filter plate 1. The filter plate 1 (FIG. 3) moves with its side lugs 6 over the inclined surface of the teeth 18 of the toothed racks 17 and falls down after reaching the tooth tip by using its side lugs 6 against the upper surface of the longitudinal bars 4 or against the elastic material 25 comes across. The filter residue comes off and falls into a receiving bunker. After the filter plate 1 has passed the last tooth of the racks 17, it is pressed against the pressure plate 3. The slides 11 (Fig. 2) return to move the next filter plate 1 and the process is repeated.

In this way, all filter plates 1 are successively shifted and the residue is discharged.

After the last filter plate 1 (FIG. 4) has been moved, the carriages 11 return and move the discharge device 15 in the direction of the counter-pressure plate 2.

The additional rods 19 are brought to a standstill after reaching the limiter 23, and the toothed racks 17 lower under the action of the movement of the housing 16 of the discharge device 15 and the tabs 20. The teeth 18 lower below the edge of the housing 16.

The slides 11 of the device 7 for displacing the filter plates 1 begin to move in the direction of the clamping device 5, the pawls 28 (FIG. 2) engaging with the lugs 27 of the housing 16 and the discharge device 15 in the direction of the clamping device 5 move. The auxiliary racks 19 are stopped as soon as they have reached the limiters 22 (FIG. 3), and the racks 17 go up under the action of the movement of the housing 16 and the tabs 20, the teeth 18 of the racks 17 over the kick the upper edge of the housing 16. The device 7 for moving the filter plates 1 (FIG. 1) is switched off and the clamping device 5 is switched on again, after which the operating cycle of the filter press is repeated.

In this way, the fact that 15 racks 17 are provided in the discharge device, which are at least equal to the path length of a filter plate 1, and additional racks 19 are used, which are connected to the racks 17 by means of tabs 20, and by the use of at the Racks 17 articulated spring-loaded stops 24 simplify the construction and guarantee a guaranteed removal of the residue.

The filter press can be used in the coal industry for dewatering flotation waste and the production of a closed water-slag cycle, in the ceramic industry for dewatering slips, in the chemical industry for filtering the sludge of organic intermediates and dyes, and for filtering waste water in different branches of industry, which contributes to an improvement in environmental protection.

5

10th

15

20th

25th

30th

35

40

45

50

55

60

65

S

2 sheets of drawings