Isostatic pressing forming mould and method for preparing filter plate made from sintered porous material

Abstract

The invention discloses an isostatic pressing forming mould for preparing a filter plate made from a sintered porous material, and a method for preparing the filter plate made from the sintered porous material by using the mould. The mould comprises an external mould unit, an internal mould unit, a bottom mould sealing unit and a top mould sealing unit, wherein the external mould unit comprises a hollow plate-shaped sleeve that is made from an elastic material; the hollow plate-shaped sleeve is equipped with a top opening and a bottom opening; the top opening and the bottom opening are respectively in sealed connection with the top mould sealing unit and the bottom mould sealing unit; the internal mould unit comprises a core plate that is matched with an inner cavity of the hollow plate-shaped sleeve; the core plate, the hollow plate-shaped sleeve, the bottom mould sealing unit and the top mould sealing unit make up a mould cavity; the bottom of the core plate is located and installed on the bottom mould sealing unit; the top of the core plate is close to the top opening of the external mould unit, and a reinforcing rib forming groove that extends toward the inside of the core plate is arranged on the top of the core plate; after forming, when the core plate is drawn out of the bottom opening of the hollow plate-shaped sleeve, a reinforcing rib formed by the reinforcing rib forming groove does not impede the core plate to do a core pulling motion.

Description

technical field [0001] The invention relates to a plate-shaped sintered body and its preparation technology, in particular to a sintered porous material filter plate and its preparation technology. Background technique [0002] Sintered porous material filter elements are generally made into tubes, called sintered porous material filter tubes. Sometimes, the sintered porous material filter element is also made into a plate shape, which is called a sintered porous material filter plate. For example, the filter elements used in some vacuum filters are fan-shaped sintered ceramic porous material filter plates. [0003] The current sintered porous material filter plates generally have the following three types of structures and preparation methods: the first type is grouting molding, that is, a ceramic filter substrate with a hollow structure is obtained by grouting, and the cavity is filled with supporting particles. and then apply a filter surface layer on its surface, such ...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the above-mentioned first category is: in order to ensure that the filter plate has sufficient mechanical strength, it is usually necessary to use ceramic particles with a smaller particle size, so that the resulting micropores are small, which will increase the filter plate’s water filtration resistance; secondly, the grouting method Molding can only obtain a hollow body with substantially equal peripheral walls. Due to the limitation of the suction wall thickness, the two side walls appear relatively thin, and the tensile strength of the transferred side wall is low, which often causes cracks at the root of the filter plate during use. Or even broken; moreover, the hollow support is for the accumulation of particles, and the drainage resistance is relatively large, which affects the filtration efficiency and production capacity

The disadvantages of the second category are: the production process is relatively long, and the production efficiency is not high. Causes cracking of the matrix; excess internal adhesive will produce rough protrusions on the side of the raised support ribs, occupying the flow channel and increasing drainage resistance; moreover, the bonded product is prone to cracking due to weak adhesion during use , this type of cracking accounts for about 5%, and the asymmetric structure has low fatigue strength against suction alternating stress and short service life

The disadvantage of the third category above is that there is a large difference in the overall density, especially the low loose density of the connection part of the two filter plates, which seriously affects the overall mechanical strength of the substrate. During the working process, the alternating stress of suction and recoil is easy to occur. Fatigue cracking and scrapping; and it is also possible that during the sintering process, due to the different density of each part of the filter plate, deformation or even cracking occurs, resulting in a decrease in the yield

Images