JPH0233402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a filter cloth moving type of a single filter press.

Prior Art and Problems to be Solved by the Invention A single filter press does not have a filter frame, but has a recess in the center of the filter plate, and the recess is used as a filter chamber. Conventionally, two filter cloths are sandwiched between each filter plate, and a filtration operation is performed by supplying slurry, which is a liquid to be filtered, between the filter cloths. Two methods are used to supply slurry between these two filter cloths. Specifically, one is such that the slurry supply port communicates with all the filter plates, the openings of the two filter cloths between each filter plate, and the openings of each supply plate provided between these two filter cloths. The slurry is supplied to each filter chamber through an opening provided on the lower side of the supply plate, and all the filter chambers are connected to each other. 83275, JP-A No. 54-6176, etc., each chamber has an independent supply port and an opening is provided at the corresponding contact area of only one filter cloth that contacts the supply port, and the gap between each filter plate is It is of the type that is supplied independently to the filter chamber.

When using the former type of feeding method, it is necessary that all the openings of the filter plate and the openings of the filter cloth and the feeding plate all match, and if even one chamber does not match, the slurry will It is not supplied beyond the first part, which results in a decrease in filtration ability, etc. That is, in this type of filter, it is an essential requirement for smooth operation of the filter that all the openings for slurry supply are aligned with each other. For this reason, in this type of filter, the two filter cloths between each filter plate and the supply plate provided between the filter cloths are installed with their openings aligned, and in order to discharge cake, etc. This is an unavoidable structure, as it is necessary to always move the entire filter cloth between each chamber the same distance after opening the chambers to a certain gap. Furthermore, this discharge method moves the entire filter cloth at the same time, so all the cake falls at the same time, so the cake discharge device needs to be large and sturdy, and a large amount of cake can be discharged at once. Handling may cause obstructions such as closures at the outlet etc.
In addition, since all the filter cloths are washed at the same time, a pump with a large capacity is required, and the time required for discharging the cake in the filtration cycle increases, resulting in a reduction in the capacity of the filtration machine. was.

Next, in the latter conventional independent supply method, the upper parts of the two filter cloths between the filter plates are connected to a horizontal horizontal rod, which is moved up and down, so that while the filter plates are moved, The cake can be discharged without the whole amount of cake falling at once as in the former type, and therefore the cake discharge device can be small. However, when the two filter cloths between the filter plates are opened when the filter plates are moved, tension may be generated in these filter cloths or the wire or pulling device used to pull them up, causing stress to be applied to them. However, there were disadvantages such as the stress applied to the two filter cloths on the adjacent filter plate surfaces was different.

SUMMARY OF THE INVENTION The present invention relates to a type of filter cloth transfer that uses the latter independent feeding method and does not have these disadvantages. The present invention removes cake formed on the filter cloth surfaces by simultaneously lifting the lower portions of two filter cloths in contact with both sides of each filter plate of a single filter press using a wire or the like, and employs the following configuration. ing.

A pair of filter cloths that can move up and down is placed between a plurality of filter plates that are arranged in parallel to each other so that they can be approached and separated by driving, and slurry is supplied between each filter cloth and compressed and deliquified. A single type filter press with a horizontal bar attached along the upper edge of the filter cloth, one end of a pair of strings tied to both ends of the horizontal bar, and a hanging bracket attached to the lower edge of the filter cloth. The other end of each string is tied together to form an endless feeding body, an upper guide roller is provided above each filter plate, and a lower guide roller is provided below each filter plate, and the string is wrapped around the upper guide roller and the lower A filter cloth assembly consisting of a filter cloth wrapped around a guide roller and an endless feeding body wrapped around both guide rollers is arranged in such a manner that the filter cloth runs along both sides of each filter plate, and The lifting fittings of the paired filter cloth assemblies are commonly integrated, the lower ends of the lifting wires are tied to the lifting fittings, and the lifting fittings are pulled up with the lifting wires, thereby lifting the pair of filter cloths. A single type filter press configured to simultaneously feed the filter cloths downward and simultaneously feed the pair of filter cloths upward using the biasing force of the weight of the lifting fitting.

Conventionally, in the independent supply system,
As in No. 75711, the space between the filter plates is opened, and at the same time, the upper part of the two filter cloths between the filter plates are joined, and the lower part of the filter cloth is opened, and the cake is peeled off by tension or impact applied to the filter cloth. It was thought that it would be difficult to remove the cake simply by lowering the filter cloth. However, at present, the cake is compressed using a diaphragm, and the selection of filter aids and filter media has made it easier to remove the cake, reducing cake adhesion to the filter cloth, and eliminating the need to raise and lower the filter cloth each time. However, the cake could be peeled off more easily than the filter cloth. In addition, when employing the above-mentioned compression diaphragm, it became possible to adopt a structure in which the diaphragm is provided only on one of the adjacent filter surfaces, and the other surface only supports the filter cloth. .

1 to 4 are explanatory diagrams of a single filter press as a reference example to facilitate understanding of the present invention.

The filter plate usually has a rectangular shape, and the filter plate 1A has a large number of protrusions 3 in a central recess (filter chamber) to support the filter cloth. The filter plate 1B has a flat recess in the center and has no protrusions, but both sides of the filter plate are made of an elastic material for cake compression, and the opposite side in contact with the filter plate has a filter cloth support. A diaphragm 2 having a large number of protrusions 4 is attached thereto. These filter plates 1A and 1
B may be used alternately, and as shown in Fig. 2, a filter plate 1 having a large number of protrusions 3 on only one surface, the other surface being flat, and a diaphragm attached to this flat surface.
C may also be used. The filter plate 1A is provided with a slurry supply port 5 and a filtrate discharge port 6, each of which communicates with the outside. The filter cloth attached to each filter plate is mainly made of synthetic fiber and has a belt shape with a constant width.The upper part is attached to a nearly horizontal horizontal bar 8, and the lower part is fixed to a take-up roll 10 etc. via a return roller 9. has been done. One of the methods for raising and lowering the filter cloth is disclosed in Japanese Patent Application Laid-open No.
As detailed in No. 55-54007 (Japanese Patent Application No. 53-128874), briefly stated, the filter cloth is always pulled downward by the lower take-up roller 10. In order to pull it up along the same line, as shown in FIG. Then, by fixing the movable pulley to the tip of the fluid pressure cylinder 13 and injecting pressurized fluid into the cylinder 13, the filter cloth that has been wound around the lower winding roller is rewound to the filter surface. When the filter cloth is lowered, the fluid pressure in the cylinder 13 is lowered so that the filter cloth is wound up by a lower winding roller and lowered.

Now, in the case of the filter plate 1A, the part of the filter cloth 7 that contacts the slurry supply port 5 is opened, and in order to reinforce this opening, rubber or the like is applied or a thin plastic plate 7A is placed in the opening. It is attached. In the filter plate 1B, the portion of the filter plate and diaphragm corresponding to the opening of the filter plate 1A is slightly recessed to facilitate the inflow of slurry, and an outlet 15 of pressurized water is provided on the filter plate on the back side of the recessed portion. , and the exit 1
Pressurized water outlets 16 of the same diaphragm are opened slightly below 5, and these outlets 1
By injecting pressurized water pressure into 5 and 16,
The diaphragm can be expanded to prevent compression of the cake and leakage of slurry and the like. In addition,
The filter cloth in contact with the filter plate 1B does not have a slurry passage port. Both sides of the filter plate 1C have the structure of filter plates 1A and 1B, respectively, as shown in FIG.

These filter plates 1A and 1B can be combined alternately one by one, or the filter plates 1C can be combined with a diaphragm 2 between each filter plate, as shown in FIG. placed and used between The filter plate is moved by applying fluid pressure in a hydraulic cylinder 20 attached to the fixed frame 19 and moving the movable end plate 18 connected to the cylinder. To open the space between each filter plate, the movable end plate 18 is moved to the right in the figure, and the space is opened at a constant interval by tie bolts 21 etc. provided between each filter plate, and then when the space between the filter plates is closed, , the movable end plate 18 is moved to the left by the hydraulic cylinder 20.

Embodiment An embodiment of the present invention shown in FIG. 5 will be described below. In the drawings, the same reference numerals as those shown in FIGS. 1 to 4 indicate the same members as those shown in FIGS. 1 to 4.

The filter plate 1D shown in FIG. 5 is shown as being of the same type as the previous filter plate 1A, and can be used in alternate combination with the filter plate 1B. As in the previous reference example, one end of the string 25 is tied to both ends of the horizontal bar 8 attached along the upper edge of the filter cloth 7, and the string 25 is attached to the lifting fitting 23 attached to the lower edge of the filter plate 1D. pair of strings 2
The other end of 5 is tied. Therefore, the filter cloth 7
The string 25 forms an endless conveyor. In this endless feeding body, a string 25 is wound around an upper guide roller 24 arranged above the filter plate 1D, and a lower end portion of the filter cloth 7 is wound around a lower guide roller 22 arranged below the filter plate 1D. The filter cloth is hung around both guide rollers 24 and 22 in the suspended state, and the filter cloth assembly is formed as a whole. This filter cloth assembly is provided with a pair of front and rear parts for one filter plate 1D, and the lifting fittings 23, 23 of both filter cloth assemblies are commonly integrated with a pair of fittings 27. ,
Filter cloths 7, 7 are along both sides of the filter plate 1D. The lower ends of a pair of pulling wires 26 are tied to the pair of metal fittings 27, respectively, and the pair of pulling wires 26 are arranged along both sides of the filter plate 1D, and are arranged above the filter plate 1D. The wire guide roller 28 is connected to a drive winding drum (not shown), etc. while being locked to a wire guide roller 28. The lifting fittings 23, 23 integrated by the fitting 27 are pulled up by operating a drive source such as a winding drum,
The lowering leaves the wire 26 free with respect to the drive source, and the metal fittings 23, 27 made of appropriate weight.
It is carried out by its own weight. The vertical movement of the metal fittings 23, 27 causes the vertical movement of the filter cloths 7, 7. When the metal fittings 23, 27 are raised, the filter cloth 7 is sent downward, and when the metal fittings 23, 27 are lowered, the filter cloth 7 is fed downward. is sent upward.

The filter plate 1D and the filter cloths 7, 7 are combined as described above, and a plurality of these combinations are assembled into a single filter press in the manner shown in FIG. used as. The usage mode will be explained below.

With the filter cloths 7 lying along the surface of the filter plates 1D as shown in FIG. Pressure dehydration is performed (filtration process).

After the filtration is completed, the fluid pressure cylinder 20 is operated to separate the filter plates 1D from each other. During this time,
When the metal fittings 23 and 27 are pulled up by the pulling wire 26, the filter cloth 7, which has become heavy due to the adhering of the removed cake, is sent downward, and the cake peels off from the surface of the filter cloth 7 and falls off. (Cake discharge process). The filter cloth 7 may be conveyed downward after each filter plate 1D is completely separated.

Filter cloth 7 becomes lighter due to shedding of cake
is fed upward by freeing the wire 26 with respect to the drive source and lowering the metal fittings 23 and 27 by their own weight (filter cloth initial position setting step).

Effects of the Invention As is clear from the above description, in the single filter press of the present invention, the filter cloth and the string are combined into an endless feeding body with the horizontal bar and the lifting fitting interposed, and are tied to the lifting fitting. The filter cloth drive mechanism is simple because the filter cloth is transported downward by pulling up the lifting metal using a lifting wire, and the filter cloth is transported upward by the weight of the lifting metal. The structure around the filter plate is simplified, and since it handles slurry, there are fewer contaminated parts of the equipment, which tend to get dirty, and maintenance management such as cleaning becomes easier, contributing to environmental improvement and reducing equipment manufacturing costs. , it is possible to reduce maintenance costs.

In addition, there are no parts that are likely to be affected by corrosion or contamination, such as the spring that biases the filter cloth winding roller or the guide member for moving the filter cloth, in areas that are contaminated by slurry. It has excellent durability and always provides stable performance.

Furthermore, the two filter cloths that exist between adjacent filter plates are not connected to each other and are moved up and down independently for each filter plate, so when separating each filter plate, the filter cloth There is no tension acting on the
Filter cloth is less likely to be damaged.

[Brief explanation of drawings]

Figure 1 is a vertical side view showing a set of filter plates (and filter cloth) as a reference example used in a single filter press, and Figure 2 is a side view of a set of filter plates (and filter cloth) as a reference example that doubles as the two filter plates in Figure 1. A vertical side view showing one filter plate (and filter cloth), FIG. 3 is a front view of the main part showing the filter cloth drive mechanism of a single filter press as a reference example using the filter plate, and FIG. FIG. 5 is a side view of a single-type filter press, and FIG. 5 is a side view with main parts cut away showing a filter cloth drive mechanism according to an embodiment of the present invention. 1A, 1B, 1C, 1D...filter plate, 2...diaphragm, 5...slurry supply port, 6...filtrate outlet, 7...filter cloth, 8...horizontal bar, 9...return roller, 10... ...Filter cloth take-up roller, 11, 12...
Pulley, 13...Fluid pressure cylinder, 14...Wire, 15, 16...Diaphragm pressurized water outlet,
17... Fixed end plate, 18... Moving end plate, 19...
Fixed frame, 20...Fluid pressure cylinder, 21...
...Tie bolt, 22...Return roller, 23...
...Lifting bracket, 24... Upper guide roller, 25...
...String, 26...Wire, 27...Metal fittings, 28...
...Wire guide roller.

Claims (1)

[Scope of Claims] 1. A pair of filter cloths that can be moved up and down is arranged between a plurality of filter plates that are arranged parallel to each other so that they can be approached and separated by driving, and a pair of filter cloths that can be moved up and down is disposed between each of the filter plates. In a single filter press that compresses and dehydrates the filter by supplying water, a horizontal bar is attached along the top edge of the filter cloth, one end of a pair of strings is tied to both ends of the horizontal bar, and the strings are attached to the bottom edge of the filter cloth. The other end of each string is tied to the lifting fitting to form an endless feeding body, an upper guide roller is provided above each filter plate, a lower guide roller is provided below each filter plate, and the string is attached to the upper guide roller. A filter cloth assembly is constructed by wrapping the filter cloth around the lower guide roller and wrapping the endless feeder around both guide rollers, and disposing the filter cloth assembly along both sides of each filter plate. The lifting fittings of the paired filter cloth assemblies are commonly integrated, the lower ends of the lifting wires are tied to the lifting fittings, and the lifting fittings are pulled up with the lifting wires. 1. A single filter press characterized by having a structure in which a pair of filter cloths can be simultaneously fed downward, and a pair of filter cloths can be simultaneously fed upward using a biasing force due to the weight of a lifting fitting.