RU104510U1 - MOBILE DEVICE FOR PRODUCING BUILDING SOLUTIONS AND MIXTURES - Google Patents

Abstract

 A mobile device for producing mortar and mixtures, containing a system for preparing and supplying building mixtures located on a uniaxial trailer, including a water supply pipe from an external source, a pump unit with a drive motor, a pressure pipe, hoppers for loading dry components of the mixture with their supply pipes equipped with metering nozzle devices, a mixing device and a pipeline for supplying the finished mixture, characterized in that the mixing device is made in the form of a hydrodynamic th e cavitation mixer of an ejection type containing a receiving chamber, the front and rear walls of which are in the form of a semicircle.

Description

The utility model relates to the field of construction, road-building materials and technologies and can be used as specialized construction equipment at construction sites in order to create various construction solutions and mixtures.

A device for continuous preparation of a foam concrete mixture is known, comprising a jet pump, hoppers for dry components, water tanks and a foaming agent, a foam generator, a foam mixer, a mortar mixer, a mortar hopper, a solids mixer and mortars (RU 2080993, IPC В28С 5/38, application 15.06. 1993, published June 10, 1997). The device increases the homogeneity of the mortar mixture, the degree of hydration of the binder and the mortar mixture acquires the necessary viscosity and elasticity for good mixing with the foam. All this leads to an improvement in the quality of the cellular structure of foam concrete products.

The disadvantage of this device is the design complexity and its stationary use, in addition, the use of a jet pump as a mixer does not provide mixing of the mixture components at the micro level, which implies the impossibility of obtaining finely dispersed high-quality solutions and mixtures.

A well-known mobile installation for the production of products from light concrete in container design with functional units in the form of separate modules, combined into a single system with centralized control, containing a mortar preparation module, concrete preparation module, product molding module, finished product aging module and operator module (RU 94506, IPC В28В 15/00, В28С 5/00, announced on December 22, 2009, published on May 27, 2010). The composition of the mortar preparation module includes an ejector-type cement feed device designed to feed the cement mixture directly into a mixing tank equipped with a submersible mixer.

The disadvantage of the installation is that the ejector performs only an auxiliary transport function of collecting cement and supplying a water-cement mixture to the capacity of the mortar mixer, and the main process of mixing the components is carried out mechanically using an immersion mixer. At the same time, the desired density is achieved gradually by repeatedly circulating the mixture in the solution preparation module.

The technical task of the claimed utility model is to improve the quality of the finished product, i.e. mortars and mixtures, by ensuring uniform turbulent mixing of the components of the mixture throughout the volume; reduction in cement consumption; reduced overall dimensions of the mobile installation.

This problem is solved in that a mobile device for producing mortars and mixtures, containing a preparation and supply system for building mixtures located on a uniaxial trailer, including a water supply pipe from an external source, a pump unit with a drive motor, a pressure pipe, hoppers for loading dry components of the mixture with the nozzles of their supply, equipped with metering nozzle devices, the mixing device and the pipeline for supplying the finished mixture, characterized in that the mixing device in is satisfied in the form of the hydrodynamic cavitation mixer ejection type comprising a receiving chamber, the front and rear walls which are in the form of a semicircle.

The pump unit and the hoppers for loading the dry components of the mixture are combined using a system of connecting pipes and pipelines with a hydrodynamic cavitation mixer of the ejection type, which allows mixing the components by jet-vortex cavitation method. The ejection ability is achieved by the inclusion of a receiving chamber to the cavitator with nozzles for supplying the dry components of the mixture, which made it possible to supply the components directly to the zone of the beginning of cavitation exposure. The semicircular shape of the receiving chamber prevents the deposition of dry components of the mixture in the flow part of the mixer.

The mixing process is carried out due to the ability of the formed high-speed jet of fluid (water) flow to initiate around itself the movement of the environment (mixture components). Due to the action of shear forces on the surface of a turbulent jet, solid particles are involved in the boundary layer and, consequently, the formation of a satellite flow of the ejected medium. Then, intensive turbulent mixing of the flows is carried out, with the simultaneous involvement of new solid particles, due to which the total flow rate in the stream increases. In a certain section, the growth of the boundary layer stops and, starting from this section, the involvement of new masses in the liquid stream ceases, however, energy exchange and, as a result, mixing of the components of the mixture flow continues, at the same time, the velocities of the mixed media are gradually equalized.

High homogeneity of the finished mixture is achieved by enhancing turbulent mixing by the action of vortex cavitation flows, which occurs under certain conditions in the jet boundary layer. This is due to the fact that under the conditions of hydrodynamic cavitation mixing, the interaction of a multicomponent medium occurs at the micro level due to the pulsed release of significant energy during the collapse of cavitation bubbles, the formation of cumulative microjets and the decay of the latter into high intensity microvortices, which allows a high uniformity of medium mixing. In this case, the dispersion is carried out due to the destructive mechanical action of the cumulative microjets by their high-speed penetration into particles of solid or liquid phases.

By combining all the stages of obtaining the mixture in one device, including dosing the components in predetermined proportions, the overall dimensions of the mobile unit are reduced.

The essence of the utility model is illustrated by drawings, in which Fig. 1 shows a schematic diagram of a system for preparing and supplying building mixtures, Fig. 2 shows a general view of the inventive mobile device (for clarity, the protective casing and one of the hoppers for loading dry components are removed).

The device consists of a single-axle trailer, on which the system for the preparation and supply of building mixtures is located. The system includes a water supply pipe 1 from an external source, a pump unit 2 with a drive motor, a pressure pipe 3, hoppers for loading dry components of the mixture 4 with nozzles 5 for their supply, equipped with metering nozzle devices 6, a mixing device made in the form of hydrodynamic cavitation ejection type mixer 7, and the finished mixture supply pipe 8. The mixer comprises an upstream receiving chamber 9, the front and rear walls of which are in the form of a semicircle.

The device operates as follows

A mobile device for producing mortar and mixtures is installed on a construction site, connected through a water supply pipe 1 to a water supply system, and after filling the hoppers with dry components of the mixture, the drive unit of the pumping unit 2 starts. The flow of liquid (water) pumped by the pump through the pressure pipe 3, enters the hydrodynamic cavitation solution mixer of the ejection type 7, where a high-speed jet flow is formed. At the same time, the mixer 7, under the action of gravitational forces, from the loading hoppers 4 through the metering devices 6 in dry proportions receive the dry components of the mixture, which, under the action of shear forces on the surface of the high-speed turbulent jet, are involved in the satellite motion. The formed mixture flow is subjected to intense turbulent mixing with the simultaneous effect of vortex cavitation, which consists in the formation and subsequent collapse of vapor-gas bubbles of a liquid medium and the formation of cumulative microstructures. The decay of streams into high-intensity microvortices allows one to obtain high uniformity of the mixed media and significantly reduce the number of attenuating micropores. As a result, a finely dispersed stream is formed at the mixer outlet with a given flow rate and full pressure sufficient for subsequent transportation through the pipeline 8 for supplying the finished mixture.

The technical result is

- the ability to reduce cement consumption up to 15 ... 20% due to obtaining a homogeneous mixture and a significant reduction in the number of attenuating capillary micropores;

- the presence of a receiving chamber in front of the cavitator made it possible to combine all stages of the mixture with a carrier liquid medium in one device and provide proportional dosing of the components;

- the design of the device allows mixing in a continuous mode of operation, directly on the construction site while filling the area of concreting.

Claims (1)

A mobile device for producing mortar and mixtures, containing a system for preparing and supplying building mixtures located on a uniaxial trailer, including a water supply pipe from an external source, a pump unit with a drive motor, a pressure pipe, hoppers for loading dry components of the mixture with their supply pipes equipped with metering nozzle devices, a mixing device and a pipeline for supplying the finished mixture, characterized in that the mixing device is made in the form of a hydrodynamic th e cavitation mixer of an ejection type containing a receiving chamber, the front and rear walls of which are in the form of a semicircle.