JPS6019018A - Preparation of composite layered hollow filter - Google Patents

Abstract

PURPOSE:To make it possible to strongly bond two layers, by a method wherein one of inner and outer double gap parts is packed with a material to form a first layer and the other gap part is packed with a material while pulling up a core to form a second layer. CONSTITUTION:One of inner and outer double gap parts obtained by inserting a cylindrical thin walled core 5 between a columnar inner mold 1 and a split type cylindrical outer mold 2 is packed with a filter molding material while compression molding is applied to said molding material by a rammer to form a first filter layer. Subsequently, the other gap part is packed with a separate filter material having a different particle size while the core 5 is gradually pulled up and compression molding is applied to said filter material by a rammer 4 to mold a second filter layer bonded to the first filter layer while the molded base body is baked after demolding. When a ceramic type filter material is used, a baking temp. is pref. 1,200-1,450 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a multilayer hollow filter having multiple filter layers having different particle size distributions.

(Prior art) Traditionally, hollow cylindrical filters made by molding and firing various particulate materials have been used for the purpose of filtering dust from garbage in waste incinerators. With conventional molding methods, it was possible to produce only a homogeneous single layer, so reducing the particle size of the filter layer to filter fine particles increases the filtration resistance, and also reduces the filtration resistance. Therefore, there was a problem that if the wall thickness was reduced, the necessary strength could not be maintained.

(Purpose of the Invention) The present invention has been completed with the aim of solving these problems and providing a method for manufacturing a multi-layer hollow filter having multiple filter layers that has sufficient strength and high permeability efficiency. It is.

(Structure of the Invention) The present invention provides a first filter layer by inserting an intermediate mold between an inner mold and an outer mold, filling one of the inner and outer double cavities with a filter molding material, and compression molding with a rammer. mold and
Next, while gradually pulling up the middle mold, another filter molding material with a different particle size is filled into the other gap and compression molded with a rammer to form a second filter layer joined to the first filter layer. 0 (Example) Next, the present invention will be explained in detail using the illustrated molding apparatus. The inner mold (1) is placed in the center of a potter's wheel (3) together with a cylindrical outer mold (2) divided into two parts. Then, while rotating the potter's wheel (3) at a low speed, the filter molding material is gradually dropped and filled into the lower part of the cavity, and at the same time, the rammer (4) is moved up and down to compression mold the filter molding material to a constant degree of compaction.

For example, the filter molding material has a particle size of 50μ to 10μ.
The main material is granular material such as alumina, silicon carbide, porcelain, silica sand, mullite, etc. of about 00μ, and a solidifying agent such as water glass, CMO, dextrin, ceramic flux, or glass flux at a ratio of 70 to 20%. A mixture of the following can be used, and the compression force of the rammer is, for example, about 10 OS. Once the compression molding has been carried out to a predetermined height in this way, the inner mold (1) and outer mold (2) will be formed as shown in Figure 2.
Insert the thin cylindrical medium size (5) between the medium size (5)
are sandwiched to form double inner and outer voids (6) and (7).

At this time, it is preferable to interpose a guide (8) as shown in the figure in order to stably hold the middle mold (5) with respect to the inner mold (1). Next, place the funnel (9) on top of the outer mold (2), and while rotating the inner mold (1), middle mold (5), and outer mold (2) at the same time, pour the particle size into the outer cavity (6). The first filter layer (4) of a predetermined length is molded by compressing acid 3b using the rammer 01 while filling the filter with a fine filter molding material. Next, pull out the guide (8) as shown in Figure 3, cover the outer mold (2) with another guide (8) as shown in the figure, and then cover the middle mold (
5) Fix the lifting flange QU to the upper end and abut the lifting device 0mm with the ball null bearing (6) on the lower surface of the lifting flange QU, and then attach the inner mold (1), the middle mold (5), and the outer mold (2). While continuing to rotate, gradually pull up the medium size (5). At the same time, the inner cavity (7) is filled with a coarse filter molding material having a different particle size from the filter molding material filled in the outer cavity (6), and compression molding is performed using the rammer (4) used earlier. , the second filter layer (B) is gradually formed. At this time, if the pulling speed of the middle mold (5) and the filling speed of the filter molding material are controlled so that the pulling speed of the middle mold (5) is almost equal to the molding speed of the second filter layer (B), the filled filter molding The material is pressed onto the surface of the seventh filter layer (a) by the compaction force of the rammer (4) directly under the medium mold (5), forming the second filter layer 03) joined to the first filter layer (A). Ru. After that, as shown in Figure S, the end mold αΦ
By molding the end portion using the method, a multi-layer hollow molded body is obtained in the cavity portion, so when the molded body is finished forming, it is removed from the mold and this is /200 ~ / II! Bake at 0°C. The multi-layer hollow filter thus obtained is a fine-grained first filter layer as shown in Fig.
is integrally laminated on the surface of the second filter layer (B), which has a coarse particle size, and the second filter layer (13) becomes a skeleton part with a filtration function and maintains its strength, making it possible to filter fine particles. The first filter layer (2) can be made thinner, resulting in a multilayer hollow filter with low filtration resistance and capable of filtering fine particles. In addition, in this example, the same filter molding material as the filter molding material initially introduced in the state shown in FIG. , molding started from the outer cavity (6) first, but the molding started from the inner cavity (6).
Molding can be started from step 7), and a multilayer hollow filter with three or more layers can also be manufactured by the same method, as shown in FIG. Of course, it is also possible to form a series of particles not only on the surface of the second filter layer (B) having coarse particles but also over the edges thereof.

(Effects of the Invention) As is clear from the above description, the present invention inserts a middle mold between an inner mold and an outer mold to form double internal and external voids, and utilizes either one of the voids. The first
After molding the filter layer, the middle mold is gradually pulled up while the second filter layer is molded with a rammer into the other gap, so that the compressive force of the rammer when molding the second filter layer is applied only to the lower part of the middle mold. It can also act on the first filter layer to firmly bond the second filter layer to the first filter layer. In addition, since the upper part of the first filter is protected by the middle mold during molding of the second filter, there is no risk of damage due to vibrations caused by the rammer, etc., and a perfect multi-layer hollow filter can be manufactured at all times, which has various advantages. This method has been developed in the industry as a manufacturing method for multi-layer hollow filters that can easily mass-produce multi-layer hollow filters that can accurately filter fine particles, have low filtration resistance, and other multi-layer hollow filters that have various filtration characteristics. It is extremely unique in that it contributes to the development of the world.

[Brief explanation of drawings]

Fig. 1, Fig. 2, Fig. 3, Fig.≠Fig. FIG. 3 is a longitudinal sectional front view of the hollow filter. (1): Internal mold, (2): External mold, (5): Medium mold, (6):
Outer cavity, (7): Inner cavity, (A): 1st
Filter layer (B): second filter layer. Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 f4 Figure 7

Claims (1)

[Scope of Claims] / The first filter layer is formed by compression molding with a rammer while filling one of the inner and outer double voids obtained by inserting the middle mold between the inner mold and the outer mold with a filter molding material. a second filter layer joined to the first filter layer by gradually pulling up the middle mold, filling the other gap with another filter molding material having a different particle size, and compression molding this with a rammer. A method for producing a multi-layer hollow filter, which comprises molding the material, and firing the molded body after demolding. 2. The method for manufacturing a multilayer hollow filter according to claim 1, wherein the pulling speed of the medium size is approximately equal to the molding speed of the second filter. 3.Claim 1 or 2, in which the cavity is cylindrical and the inner mold, middle mold, and outer mold are molded while simultaneously rotating.
A method for producing a multilayer hollow filter as described in Section 1.