RU1787110C - Device for hollow brick and ceramic articles fabricating - Google Patents

Abstract

Usage: production of building materials. SUMMARY OF THE INVENTION The device comprises a mouthpiece and cores with a variable cross-sectional length, having acoustic connections with vibration excitation mechanisms. In the middle part, the mouthpiece is made with a large cross section of the through hole, and core samples with a smaller cross section than in the end parts. 1 ill.

Description

The invention relates to the production of building materials and can be used in the molding of hollow bricks and ceramic products.

A floating molding die is known comprising an outer cage, lower and upper punches, as well as hydraulic cylinders connected to and supporting the cage.

A disadvantage of the device is the impossibility of producing with it a ceramic product with a density uniform in volume, which leads to a low strength of the product.

A device for molding hollow bricks and ceramic products is known, including a mouthpiece and cores, with a variable cross-sectional length, having acoustic connections with a vibration excitation mechanism. This device is selected for the prototype.

The known device has a drawback. The products obtained with the help of it require significant time and energy costs, because they have high humidity (which is necessary to give the material the desired plastic properties), therefore they do not allow accelerated heat treatment due to the risk of cracks or even destruction of the finished product.

The purpose of the invention is to reduce energy intensity.

To achieve this goal, in a device for forming hollow bricks and ceramic products, containing a mouthpiece and cores with a variable length section, having acoustic connections with vibration-excluding mechanisms, in the middle part the mouthpiece is made with a large cross section of the through hole, and the core with a smaller transverse section than in the end parts.

J joo

M

ABOUT

C5

The drawing shows a longitudinal section of the proposed device.

The device consists of a mouthpiece 1 and cores 2 located inside it. The device also contains upper 3 and lower 4 active punches connected to a power drive (not shown) and having contact with vibration excitating magnetostrictors (not shown). The punches 3 and 4 have grooves through which the core 2 passes. The channel through which the moldable mixture formed by the mouthpiece and the core flows has a cross-sectional area of the passage hole and the middle part larger than this area in the end parts of the mouthpiece and core .

The device operates as follows.

After volumetric or weight dosing between the punches 3 and 4, the mold 5 is placed in the mouthpiece 1. The punches 3 and 4 under the influence of the power drive (Pi and P2) move down due to the fact that P2 Pi, so the speed of the punch 4 - Vi is less than the speed of the punch 3-L / 2. Then the molded product comes out of the device. During the movement of the moldable mixture 5 in the mouthpiece 1 due to the fact that the speed of movement of the lower punch 4 is less than the speed of movement of the upper punch 3, the mixture is pressed. Because the channel through which the moldable mixture formed by the mouthpiece and the cores flows has a cross-sectional area of the passage section in the middle part greater than this area in the end parts of the mouthpiece and cores, the flow rate of the moldable mixture in the middle part is less than the speed in the end parts . because of

this pressing pressure of the moldable mixture in the middle part of the product is greater than the pressing pressure in the similar zone of the product obtained by the prototype. This makes it possible to compensate for the non-pressing in the middle zone of the ceramic product, which is a consequence of the lower speed (higher pressure) of the moldable mixture located near the walls of the mouthpiece and the cores and the higher speed (lower pressure) of the mixture in the middle zone. The lower speed of the moldable mixture near the walls of the mouthpiece and the core is due to the frictional forces on the contacting surfaces acting in the process of manufacturing the product.

Claims (1)

The use of the well-known features inherent in the prototype, together with the newly introduced ones, makes it possible to obtain a more uniform product on the claimed device than the product obtained using the prototype. Thus, a drier molding mixture can be used, which will reduce the firing time of the product, thereby reducing energy consumption and increasing labor productivity. SUMMARY OF THE INVENTION A device for forming hollow bricks and ceramic products, comprising a mouthpiece and cores with a variable cross-sectional length, having acoustic connections with vibration excitation mechanisms, characterized in that, in order to reduce energy consumption, the mouthpiece is made in the middle part with a large cross section of the passage opening, and cores - with a smaller cross section than in the end parts.