SU1222555A1 - Device for manufacturing shaped asbestos-cement articles - Google Patents

Description

one .

The invention can be used in the construction materials industry for the production of profiled asbestos cement products such as corrugated arched sheets curved in the longitudinal direction.

The aim of the invention is to provide the possibility of molding double curvature shells and improving the quality of the products.

FIG. 1 shows schematically the device, a general view of FIG. 2 - the same, in the process of shell profiling; in fig. 3 is a section -A-A in FIG. 2 on an enlarged scale.

The device comprises a forming conveyor with a flexible endless belt 1, upper 2 and lower 3 support rollers and a belt tensioning mechanism 1 in the form of a drive for horizontal movement of the upper support rollers 2 (not shown). Under the upper branch of the tape 1, an inflatable form 4 is mounted, which is made with a rigid base and a profile elastic diaphragm 5, which is hermetically connected to the base elastic, for example, rubber bands, strips 6 of various thickness, increasing from the center to the edge of the form. The mold is provided with a nozzle 7 for supplying compressed air.

Above the belt 1 of the forming conveyor is installed with the possibility of raising and lowering an ani vacuum profiling box 8, made with a perforated working surface 9 and a branch pipe 10 of air suction.

The profile of the working surface 9 of the vacuum box 8 corresponds exactly to the profile of the elastic diaphragm 5 of inflatable shape.

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The device works as follows.

An asceticated 5-inlet roll 12 coming from the format bar of the molding machine 11 is transported on a horizontal belt 1 of the forming conveyor to being installed in a fixed position under the inflatable mold 4. Then the upper support rollers 2 draw together, the belt 1 bends under the influence of the overrun weight 12 and is laid on the inflatable form 4, creating the longitudinal curvature of the asbestos cement shell. Next, the vacuum box 8 is lowered onto the roll, compressed air is injected into the mold 4 through the nozzle 7, the elastic diaphragm 5 expands and presses the roll forward first in the middle and then gradually 20 to the edges of the perforated working surface 9 of the vacuum box 8, thereby forming Tei the curvature of the shell in the transverse direction. At the same time, a vacuum is created in the vacuum box 8, the roll 12 is sucked onto the perforated working surface 9, lifted by the vacuum box and transferred to the steel shaped mold for hardening.

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The process then repeats in the same sequence. Making elastic diaphragm 5 with zones of varying extensibility and elastic strips 6 of different thickness ensures gradual and smooth adhesion of the roll from center to edges of the vacuum box, which eliminates stress and strain and reduces the number of cracks in the product - asbestos-cement sheath double curvature.

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Claims (1)

DEVICE FOR MANUFACTURING PROFILED ASBESTOS-CEMENT PRODUCTS, comprising a molding conveyor with upper and lower support rollers with a flexible endless belt with a tension mechanism mounted “under the upper branch of the belt an inflatable mold and a profiling vacuum box mounted above the conveyor, characterized in that it allows forming so that shells of double curvature and improve product quality, the inflatable form is made with a rigid base and a profile elastic diaphragm connected to the base m elastic strips of various thicknesses, increasing from the center to the edges of the form, and the endless belt tension mechanism is made in the form of a drive for horizontal movement of the upper support rollers.