JPH0333364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a filter cloth running type filter press that discharges cake generated between filter plates in a filtration process by running a filter cloth. .

(Prior Art) As shown in Japanese Patent Publication No. 52-14860, a typical conventional filter cloth running type filter press includes a filter cloth mounting bar that moves up and down between each filter plate in a seesaw manner. The upper and lower ends of two adjacent filter cloths are attached to these filter cloth mounting bars, respectively, and after filtration is completed, each filter cloth mounting bar is moved up and down alternately, so that the cake is alternately discharged downward. It has been known. However, in this type of filter press, the filter cloth mounting bar, the liquid supply plate, and the four filter cloths intersect and move between a few filter plates, so they often interfere with each other and malfunction. The drawback was that because they were connected, it took a lot of effort to replace them.

In order to solve this problem, the present inventor installed an upper roller at a high position above every other filter plate to prevent the filter cloth from crossing over on the other side when discharging the cake on one side. A filter press of this type was first devised and proposed in Utility Model Publication No. 59-33446, but this type of filter press had another problem in that the overall height of the device was extremely high.

Therefore, the inventor of the present invention overturned the conventional common sense and provided a large number of filter plates of the same height with endless filter cloths stretched around them, and rotated each endless filter cloth alternately in opposite directions to remove the cake. We prototyped a filter press that discharged upwards, but because the filter cloth separated to the left and right above the filter plate, the cake was discharged inconsistently, sometimes to the right and sometimes to the left.
It was discovered that there was a problem in which the cake was not discharged smoothly and the cake was scattered outside the aircraft.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and has a simple structure, fewer failures, easy filter cloth replacement, and increases the overall height of the machine. This was completed with the aim of creating a filter cloth traveling type filter press that does not require a filter and can smoothly discharge the cake by maintaining a constant cake discharge direction.

(Means for Solving the Problems) The present invention provides an endless filter cloth that wraps around each filter plate between an upper roller and a lower roller that protrude above and below a large number of filter plates. This is a filter press for discharging cake, and is characterized in that the height of the upper roller is alternately set in a zigzag shape for each filter plate.

(Example) Next, the present invention will be described in more detail with reference to illustrated examples.

In the figure, 1 is a large number of filter plates provided between the fast head 2 and the loose head 3, 4a, 4
5 b is an upper roller protruding above each filter plate 1;
is a lower roller projecting below each filter plate 1. Reference numeral 6 denotes an endless filter cloth stretched between the upper rollers 4a, 4b and the lower roller 5 so as to surround each filter plate 1. In the present invention, the heights of the upper rollers 4a, 4b are alternately zigzag in height for each filter plate. That is, in this embodiment, the upper rollers 4a of the odd-numbered filter plates 1 are provided at a relatively low position, and the upper rollers 4b of the even-numbered filter plates 1 are provided at a relatively high position. Therefore, the upper end of the filter cloth 6 stretched around each filter plate 1 also has a zigzag step.

7a and 7b are upper sprockets provided coaxially with the respective upper rollers 4a and 4b, 8 is a lower sprocket provided slightly above the lower roller 5, and a filter cloth driving chain stretched between these sprockets. 9 and the filter cloth 6 are connected via a filter cloth drive bar 10 whose both ends are supported by the filter cloth drive chain 9. 11a and 11b are spline shafts that mesh with the upper sprockets 7a and 7b via bevel gears and drive the filter cloth driving chain 9 together with the upper sprockets 7a and 7b. It is installed in two levels, upper and lower. Note that 12 is a cover, which is shown only on the top of the fast head 2 and loose head 3 in the drawing, but is also provided on both sides of the filter plate 1 in the width direction to prevent the cake from scattering around. Reference numeral 13 designates an arch-shaped cake reversing cover that is provided as necessary, and in this embodiment is provided so as to straddle every other filter plate 1 and to be able to be opened and closed together with the filter plate 1.

(Function) The filter cloth drive bar 1 configured in this way is
0 is located at the upper end of the upper rollers 4a, 4b, each filter plate 1 is closed, and filtration is performed in the filter chamber formed between the filter cloths 6, 6. After filtration, each filter plate 1 is closed as in the conventional case. Open to each other. Next, as shown in the figure, the filter cloths 6 around each filter plate 1 are run in opposite directions, for example clockwise for odd numbered filter plates 1 and counterclockwise for even numbered filter plates 1. let As a result, the cake 20 sandwiched between the two filter cloths 6, 6 on the side running downward peels off from the filter cloth 6 at the lower roller 5 and falls downward, as shown in the figure, but the cake 20 runs upward. The cake 20 sandwiched between the two filter cloths 6, 6 on the filtering side moves above the filter plate 1 and is peeled off by the upper roller 4b. In the present invention, the heights of the upper rollers 4a and 4b are alternately arranged in a zigzag pattern, so that the cake is first peeled off by the lower upper roller 4a, and then by the higher upper roller 4b. be exposed. Therefore, in each chamber, the final peeling position of the cake from the filter cloth 6 is fixed to the upper roller 4b side, and smooth cake discharge is performed. Moreover, the peeled cake is rolled up into this step part without forming a bridge, and the filter cloth 6 passes over the upper roller 4a located at the lower position.
falls downward from the gap on the side running downward. If the filter cloth drive chain 6 is reversed when the filter cloth drive bar 10 has moved to the vicinity of the lower sprocket 8 as shown in the figure, the peeled cake remaining above the filter plate 1 can be removed. Filter plate 1,1
This ensures that the liquid is discharged downward through the gap. If the cake reversing cover 13 is attached above the filter plate 1 as in the embodiment, the cake discharged upward can be bent downward and crushed.
It can be reliably dropped downward through the gap between the filter plates 1 and 1. Furthermore, in the embodiment described above, the cake is discharged while the filter cloth 6 is reversed halfway, but the filter cloth 6 is rotated continuously in a fixed direction with the lower roller 5 and the lower sprocket 8 coaxial. It is also possible to discharge the cake at the same time.

(Effects of the Invention) As explained above, the present invention allows the cake on one side of the filter plate to be discharged downward, while the cake on the other side is moved above the filter plate and peeled off from the filter cloth, and this peeled cake is removed from the filter cloth. is rolled downward using the step of the upper roller and dropped downward. Therefore, in the present invention, the direction in which the cake that has moved above the filter plate is discharged can be set in a fixed direction, and the cake can be discharged smoothly and the cake can be prevented from scattering outside the machine. In addition, it is possible to reduce retention due to the bridging phenomenon in the upper part of the filter plate, and it is also possible to reduce failures. Furthermore, since the filter cloth, which is a consumable item, is stretched independently for each filter plate, it is extremely easy to replace the filter cloth. Moreover, in the present invention, there is no need to lift the filter cloth high above the filter plate, and the height of the entire apparatus can be made significantly lower than that of the filter press of Utility Model Publication No. 59-33446. Therefore, the present invention greatly contributes to the development of industry as a filter cloth traveling type filter press that eliminates the problems of the conventional filter press.

[Brief explanation of drawings]

The drawings are cross-sectional views showing embodiments of the present invention. 1: filter plate, 4a, 4b: upper roller, 5: lower roller, 6: filter cloth.

Claims (1)

[Claims] 1 A filter in which an endless filter cloth 6 surrounding each filter plate 1 is stretched between upper and lower rollers 5 and upper rollers 4a and 4b protruding above and below a large number of filter plates 1, and the cake is discharged upward from the machine. A filter cloth traveling type filter press characterized in that the heights of upper rollers 4a and 4b are alternately set in a zigzag shape for each filter plate.