RU1789630C - Vacuum molding machine - Google Patents

Abstract

The invention relates to construction, in particular to devices for the manufacture of products from building materials. The inventive vacuum shield has a pressure plate with an electrically conductive plate mounted on it, connected to a pulse current generator by a flat inductor, the working surface of which is facing the electrically conductive plate, and a clamping device mounted above the inductor, while the outer surface of the perforated power element is made and with reEi a new permeable leaf. 1 s P. f-ly, 1 ill.

Description

The invention relates to construction, in particular to devices for the manufacture of products from building materials.

A device is known for the production of products from concrete and similar mixtures, including a container for the formed product, a frame, a filter cloth, cavity vacuum and nozzles connected to a vacuum source.

Of the known devices, the closest in technical essence and the achieved positive effect is the vacuum shield described in 2. The device includes a capacitance matrix, a frame, the cavities of which are connected to a vacuum system, a perforated power element and a filter placed inside them, the frame made with through the intermediate cavities communicating with the atmosphere, located between the main.

This device does not allow to obtain high-quality products in the manufacture of them from concrete mixtures of high humidity, since moisture (water) is sucked from the surface layer of the product. This leads to an uneven change in the properties of concrete, and under adverse conditions and to the presence of a large number of air pores .....

The aim of the invention is to improve quality by increasing the density of concrete products.

This goal is achieved in that a known device comprising a matrix container for a molded product, a frame; connected to the rarefaction source, under which the perforated power element and the filter are located, is additionally equipped with a pressure plate mounted on the frame with a conductive plate mounted on it, connected to a pulse current generator by a flat inductor, the working surface of which faces the conductive plate and the clamping device mounted above the inductor wherein the outer surface of the perforated power element is provided with a rubber permeable sheet. In addition, this goal is achieved by the fact that the filter is tired

with

VI co

SQ

ON GO

ABOUT

renewed in the cavity of the frame connected to the vacuum source (this may be a replaceable filter element, for example spongy).

When magnetically pulsed impacts on a molded product, water moves not only in the vertical direction, but also in the horizontal, providing a uniform distribution of moisture throughout the volume of the product, which is not ensured by known methods; for example vibrocompression.

In the drawing. quit vacuum shield, general view. .;. . . ;; ....

The vacuum shield includes a container matrix 1 for the molded product, a frame 2 with a cavity, a perforated power element 3, provided with an outer permeable rubber sheet 4. A filter (replaceable filter element) 5 is installed in the cavity of the frame. A push plate 6 is installed on the frame, above it is an electrically conductive plate 7 and a flat inductor 8, which is pressed by the clamping device 9 (it is possible to use a hydraulic actuator for this purpose). A flat inductor is connected to the pulse current generator 10. The cavity of the frame is connected through a pipe 11 to a vacuum source 12 .-; .., ...-.: ... - /. :. -. -,.; . .: ..

The device operates as follows. ;., ... .....-.-. X: -., .. - ..:. , .... :

After loading the concrete mixture into the container matrix 1, a permeable rubber sheet 4, a perforated power element 3 is installed over it, then a frame 2, in the cavity of which a replaceable filter element 5 is placed. A pressure plate 6, an electrically conductive plate 7 and a flat inductor 8 are installed on the frame The entire system is compressed by the clamping device 9. After turning on the pulse current generator 10 through the inductor 8, a magnetic pulse is applied to the conductive plate 7, which transmits instantaneous force (shock) through imnuyu plate 6, the frame 2 and the perforated power element 3 on the molded product from which the moisture is expelled. Moisture through the permeable rubber sheet 4 and the perforated power element 3 enters the cavity of the frame, where the change filter element 5 is placed, for example spongy. Placing a filter in the form of a removable sponge filter element in the cavity of the filter frame increases the efficiency of moisture collection due to the high capillary effect. After termination

pulse source vacuum

12 and moisture is sucked off. At

necessary cycle can be repeated.

The quality of products made from concrete mixtures in such a device is improved by increasing the packing density of concrete components, reducing the size of capillary pores, which certainly contributes to the convergence of cement particles and conditions

hydrating it,

The invention is illustrated by the following example.

For the manufacture of tiles in size

A 300x3OOx25 mm solution was placed in a container matrix and the vacuum shield was brought into working condition, as shown in the figure. Concrete included: Portland cement M400 of the Riga cement-slate plant with an activity of 386 kgf / cm2 (ng, 27.3%), quartz sand with a bulk modulus of 2.15, crushed stone dolomite (quarry Plvin s), water meeting the requirements GOST 23732-79. Indicator B: C 0.5. Tiles were made only using vacuum-Pi (for 5. min) and evacuation after magnetic-pulse exposure (magnetic-pulse exposure was performed with an energy of 5.3 kJ and suction in

for 1 minute, and then magnetic pulse exposure with an energy of 8.4 kJ and suction for 3 minutes). In the first case (evacuation only), the volumetric mass of the freshly formed sample was 2362 kg / m, in the second case (i.e., using magnetic-pulse action) - 2603 kg / m3. That is, the increase in density was more than 12%. In addition, it was noted that the tiles have smooth surfaces.

Using the proposed device, in comparison with the prototype, improves the quality of products made from concrete mixtures by increasing the density.

Claims (2)

The formula is invented. And 1. A vacuum shield containing a matrix, a frame connected to a vacuum source, under which a perforated power element is located, and filter, characterized in that, in order to improve the quality of products, it is equipped with a pressure plate mounted on a frame with an electrically conductive plate mounted on it, connected to a pulsed current generator with a flat inductor, the working surface of which is facing the conductive plate, and a clamping device mounted above the inductor, while the outer surface of the perforated power element is provided with a rubber permeable sheet. 2. A vacuum shield according to claim 1, characterized in that the filter is installed in the cavity of the frame.