JPH0515710A - Filter press - Google Patents

Abstract

PURPOSE:To greatly reduce the inclination of a filter plate when the filter plate is opened or closed and considerably reduce an eccentric load on a hydraulic cylinder to eliminate the strain of a rod of the cylinder. CONSTITUTION:In a filter press wherein a plurality of filter plates 5 are pressed by a hydraulic cylinder 3 through a clamping plate 6 and slurry is forced into filter chambers formed between a plurality of filter plates to separate cakes from filter liquid by means of filter cloths, the loading center of pressing force caused by the cylinder 3 is set at a position above the center of the filter plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter press for dewatering sludge to be treated generated in a water purification plant or a sewage treatment plant and separating it into a filtrate and a cake.

[0002]

2. Description of the Related Art FIG. 5 is a partially cutaway front view of a single-type endless filter cloth traveling type filter press in which a plurality of filter chambers are formed by one filter cloth, and a front frame 2 of the filter press 1 is shown. Is provided with a hydraulic cylinder 3, a plurality of filter plates 5 are provided between the front frame 2 and the rear frame 4, and the filter plate 5 is pressed toward the rear frame 4 by the hydraulic cylinder 3 via the tightening plate 6. It is configured as follows.

Conventionally, in this type of filter press 1, filter plate support portions 5A are formed on both sides of an upper portion as shown in FIG. 6 on a long side frame 7 installed between a front frame 2 and a rear frame 4. The filtered filter plate 5 is guided by the side frame 7 so as to be slidably supported, and these filter plates 5 are
A piece of filter cloth 8 is vertically sandwiched between them. Then, the plurality of filter plates 5 are connected to each other via the tightening plate 6 to the hydraulic cylinder 3
From the front frame 2 direction to the rear frame 4 by the rod 9 of
It is pressed in the direction and closed to form a plurality of filter chambers.

As shown in FIG. 7, the tightening plate 6 and the tip of the rod 9 of the hydraulic cylinder 3 are provided with a mounting groove 10 on the rod 9 side, and the tightening plate 6 has an L-shaped cross section. The mounting member 11 is mounted by the bolts 12, the mounting member 11 is fitted into these mounting recessed grooves 10, and the tip of the rod 9 is fixed and joined to the central portion of the tightening plate 6.

Next, the operation of the above structure will be described. The filter cloth 8 is sandwiched between a plurality of filter plates 5 in advance, and the hydraulic cylinder 3 is operated to advance the rod 9. The tip of the rod 9 presses the filter plate 5 toward the rear frame 4 via the tightening plate 6 to form a plurality of filter chambers between the filter plates 5. The slurry is press-fitted into the filter chamber thus formed from the rear frame 4 side and filtered by the filter cloth 8, the filtrate flows out from the bottom, and the cake remaining between the filter cloths 8 is subjected to the squeezing step and the air blowing step. After that, the filter plate 5 is opened and discharged.

[0006]

However, in the conventional filter press 1, since the filter plate 5 is in a suspended state,
When the filter plate 5 is closed, the filter plate 5 and the tightening plate 6 incline such that the lower end side of the filter plate 5 advances in the forward direction as shown in FIG. When the tightening plate 6 is tilted in this manner, the rod 9 and the tightening plate 6 are fixed as described above, so that there is a problem that an eccentric load is applied to the rod 9 and the rod 9 is distorted.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a filter press in which an eccentric load is not applied to a rod even when a filter plate is pressed through a tightening plate. I am trying.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a plurality of filter plates are pressed by a hydraulic cylinder through a tightening plate, the slurry is pressed into a filter chamber formed between the plurality of filter plates, and the filtrate is filtered by a filter cloth. In the filter press for separating the cake, the center of load of the pressing force of the hydraulic cylinder is set above the center of the filter plate.

[0009]

According to the present invention, when the filter plate is closed or opened, the center of the pressure applied by the hydraulic cylinder is set above the center of the filter plate so that the portion closer to the resistance position when the filter plate is moved is pushed. Since the force is applied to the center of gravity when the filter plate is moved, the tilt of the filter plate is greatly reduced when the filter plate is closed or opened, and the eccentric load on the hydraulic cylinder is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same members as those in the conventional example are designated by the same reference numerals.

FIG. 1 is a partially enlarged view of a filter press according to an embodiment of the present invention, in which 3 is a hydraulic cylinder, 5
A filter plate, 6 is a tightening plate, and 9 is a rod. As shown in FIG. 2, the rod 9 of the hydraulic cylinder of this embodiment is configured so that the center C of pressing force is set higher than the center of the filter plate 5. The weighted center C set above this is eccentric by the length A just above the center of the filter plate 5. The length of this A is 1 / 100L when the length of the filter plate in the vertical direction is L
It is set in an appropriate range within the range of 10 / 100L. However, the present invention is not limited to this numerical range.
In this way, the tightening plate 6 is pressed by the rod 9 so that the weighted center C is directly above the center of the filter plate 5.

Next, the operation of the above structure will be described. With the above structure, the weight center C is eccentric just above the center of the filter plate 5 by the length of A so that the rod 9 moves when the filter plate 5 moves. The part closer to the resistance position will be pushed. As a result, a force is applied to the center of gravity of the filter plate 5 during movement, so that the filter plate 5 and the tightening plate 6 rarely tilt. Therefore, the eccentric load on the rod 9 is significantly reduced when the hydraulic cylinder 3 is pressed, and the rod 9 is not distorted as shown in FIG.

The same applies when the filter plate 5 is opened. By pulling a portion eccentric by the length A just above the center of the filter plate 5, the portion where the rod 9 is closer to the resistance position when the filter plate 5 is moved. Since the force is applied to the center of gravity of the filter plate 5 when the filter plate 5 is moved, the filter plate 5 and the tightening plate 6 rarely tilt. Therefore, the eccentric load on the rod 9 is significantly reduced even when the plate is closed, and the rod 9 is not distorted. Thus, the eccentric load is less likely to be applied to the rod 9 of the hydraulic cylinder 3 when the filter plate 5 is closed or opened.

FIG. 3 shows a pressing point P of the filter plate 5 when the hydraulic cylinder has four rods 9 and the four rods 9 press the tightening plate 6. In the case of the second embodiment as well, the weighted center C is eccentric by the length A just above the center of the filter plate 5. Even with such four rods 9, it is possible to reduce the application of an eccentric load to the hydraulic cylinder 3 when the filter plate 5 is closed or opened as in the first embodiment.

FIG. 4 shows a third embodiment, in which the center of weight of the rod 9 of the hydraulic cylinder is set to the center of the filter plate 5 as in the conventional example, but between the rod 9 and the tightening plate 6. In addition, an eccentric member 13 for eccentricizing the weighted center right above the center of the filter plate 5 is interposed. According to the third embodiment, the object can be easily achieved only by interposing the eccentric member 13 without changing the position of the hydraulic cylinder.

[0016]

As described above, the filter press of the present invention has a structure in which the center of pressure applied by the hydraulic cylinder is set higher than the center of the filter plate, so that the portion closer to the resistance position when the filter plate moves. Push and pull,
When the filter plate is closed or opened, the inclination of the filter plate is greatly reduced, the eccentric load on the hydraulic cylinder is significantly reduced, and the distortion of the rod of the hydraulic cylinder is eliminated.

[Brief description of drawings]

FIG. 1 is a partially enlarged view of a filter press according to a first embodiment of the present invention.

FIG. 2 is a side view of a filter plate supported by a side frame of the filter press of the first embodiment.

FIG. 3 is a side view of a filter plate supported by a side frame of a filter press according to a second embodiment.

FIG. 4 is a side view of a filter plate supported by a side frame of a filter press according to a third embodiment.

FIG. 5 is a partially cutaway front view of a conventional filter press.

FIG. 6 is a side view of a filter plate supported by a side frame of a conventional filter press.

FIG. 7 is a partially enlarged sectional view of a conventional filter press.

FIG. 8 is a partially enlarged view of the conventional filter press when the plate is closed.

[Explanation of symbols]

 1 Filter press 3 Hydraulic cylinder 5 Filter plate 6 Tightening plate 8 Filter cloth 9 Rod

Claims (1)

Claim: What is claimed is: 1. A plurality of filter plates are pressed by hydraulic cylinders through tightening plates, the slurry is press-fitted into a filter chamber formed between the plurality of filter plates, and the filtrate and cake are filtered by a filter cloth. The filter press to be separated is characterized in that the weighting center of the pressing force by the hydraulic cylinder is set above the center of the filter plate.