Low-pressure fast-drainage plaster mold and manufacturing method

Abstract

The invention discloses a low-pressure fast-drainage plaster mold. The plaster mold comprises a mold body, wherein the mold body is made of a plaster material, a plastic hose is arranged inside the mold body, and micropores are evenly distributed on the plastic hose. The plaster mold is characterized in that a specially-shaped support is embedded inside the mold body, the plastic hose is coiled on the specially-shaped support in a spiral shape, the specially-shaped support is in a net structure which is formed by weaving of a plurality of metal wires or plastic strips, and the shape of the specially-shaped support is consistent with that of the mold body. The invention also discloses a manufacturing method of the low-pressure fast-drainage plaster mold. The method comprises the steps of closely attaching the plurality of metal wires or plastic strips to an external curve of the master mold to form the specially-shaped support in the net structure, coiling and fixing the plastic hose on which micropores are punched on the specially-shaped support, injecting plaster slurry, and taking out the mold after final set. According to the plaster mold and the method, the plastic hose penetrates through the inside of the mold body, so that compressed gases can be transferred smoothly inside the mold body, the condition that a supporting material is taken out when the plaster is semi-solidified can be avoided, and the operability and the functional stability of the plaster mold can be guaranteed.

Description

technical field [0001] The invention relates to a low-pressure fast-drainage gypsum mold for grouting molding of a ceramic body, and a manufacturing method of the low-pressure fast-drainage gypsum mold. Background technique [0002] Grouting molding is a simple and practical ceramic body molding process. Because gypsum has the advantages of low cost, good water absorption, and easy demoulding, gypsum is generally used as a mold for grouting molding. The blank slurry is poured into the gypsum mold, and the gypsum mold will absorb a large amount of water to help the blank to form. However, if you want to use the same plaster mold to cast the green body again, you must wait for the mold to dry, otherwise the plaster mold will be easily deformed, thus affecting the yield of the green body. However, the drying time of the mold generally needs 12 hours depending on the surrounding temperature, humidity and other factors. -20 hours, therefore, the traditional plaster mold technolo...

AI Technical Summary

Problems solved by technology

However, if you want to use the same plaster mold to cast the green body again, you must wait for the mold to dry, otherwise the plaster mold will be easily deformed, thus affecting the yield of the green body. However, the drying time of the mold generally needs 12 hours depending on the surrounding temperature, humidity and other factors. -20 hours, therefore, the traditional plaster mold technology mainly has the following problems: First, the drying time of the mold is too long, a worker can only cast the green body once a day, and the production efficiency is low; It is inevitable to have different subjective judgments when grasping the timing, resulting in different quality of the green body; third, the mold needs to be destroyed after being reused 90 times, and the service life is short; fourth, in order to dry the mold, it is necessary to maintain high temperature in the workshop and consume More energy, and, even in summer, the workers in the workshop have to be in a high temperature environment for a long time, which is not conducive to health

[0003] Chinese patent 200610035469.4 discloses a pressurized dry plaster mold and its preparation method. The patented technology embeds a plurality of ventilation pipes with small holes in the mold body of the plaster mold, and the ventilation pipes are distributed into a network according to the shape of the mold body. or comb shape, and connected with an air compressor, the compressed gas is discharged into the mold body through the vent pipe, forcing the moisture in the mold body to be discharged, so as to realize the rapid drying of the mold body. However, the patented technology mainly has the following problems: First, there are With multiple vent pipes, the transmission of gas pressure is limited, because this technology relies on the contact surface at the intersection of two vent pipes to transmit compressed gas, and the transfer of gas pressure is greatly reduced. After passing through several vent pipe intersections, the gas transmission The gas pressure in the vent tube drops significantly or even disappears, and the moisture in the mold body cannot be quickly and evenly squeezed out; second, the vent tube cannot be fixed accurately. When the gypsum slurry is injected into the master mold with this technology, the vent tube is easy to shift or deform, and it needs to be Timely and rapid correction; third, experience and common sense should be used to judge the degree of gypsum semi-curing when extracting the supporting steel bars. Different operators have different subjective judgments. , cannot be drawn out, resulting in a high scrap rate of molds produced in batches; Fourth, after pulling out the supporting steel bars, the hole of the steel bar on the mold body needs to be sealed. , lose the function of pressure drying

[0004] Chinese patent 200810096464.1 discloses a pressurized billet injection, pressurized dry plaster mold and its preparation method. This patented technology embeds supports such as metal rods or wires in the master mold, and when the gypsum slurry is injected and semi-cured, it is quickly drawn out. The support produces hollow air holes, and the compressed gas is transmitted through the hollow air holes. If the support is too soft, it cannot bear the weight of the gypsum slurry and causes the support to deform. If the support is too hard, it cannot be drawn out in the curved mold. In addition, , this patented technology not only needs to rely on experience and common sense to judge the degree of gypsum semi-solidification, but also easily destroys the shape of the hollow vent hole in the process of extracting the support, for example, part of the inner cavity of the hollow vent hole is enlarged or reduced or even blocked. It is especially easy to cause the intersection of the two hollow air holes to not be fully penetrated, so that the compressed gas circulation is not smooth

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