RU2449099C1 - Device for wet gunning - Google Patents

Abstract

FIELD: construction, road engineering.

SUBSTANCE: invention relates to the field of construction, namely, to devices for application of shotcreting by means of compressed air. The device for wet gunning comprising a mixer-activator and a coupled feeder with a blowdown hole. The mixer-activator is made in the form of an auger with opposite arrangement of turns towards the body bottom, where a bottom hole is arranged for mixture discharge into an auger feeder, besides, the auger feeder is attached at the bottom of the central bottom hole perpendicularly to the longitudinal axis of the mixer-activator, with a separate power drive, the auger feeder supplies mixture to the blowdown nozzle and the aerosol mixer, which are arranged at the right angle at the end of the auger feeder, where an air duct is supplied from a compressor.

EFFECT: increased reliability of a device for gunning works and its expanded use in construction.

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Description

The device relates to the field of construction, and in particular to devices for spraying concrete using compressed air.

A device for shotcrete is known, including a cylindrical body with a siphon and a loading window, in which a hopper is installed, an inlet and outlet nozzles located in the lower part of the housing and located in the last rotor blade (ed. St. USSR No. 251431, Cl. E04F 21 / 12, 1967;

SU 1006674 A, 03/23/1983; SU 251431 A, 04/07/1971;

RU 45000 U1, 04/10/2006; SU 1735537 A1, 05.23.1992;

DE 10311342 B3, 08.26.2004.

The closest technical solution, selected as a prototype, is a shotcrete device in which the screw of the mixer-activator drives the mixture to the end of the hopper, where the hole for receiving the mixture is placed, by a rotary feeder, and the shaft of the screw feeder and mixer-activator has a common drive and only special the mechanism disconnects them from each other, and in the hollow shaft of the mixer there is a tube for supplying air to the aerosol mixer (patent RU 2398081 C1, published June 20, 2010. Bull. No. 17).

The prototype has the following disadvantages:

- frequent congestion in the inlet;

- rubber blades quickly wear due to significant friction against the walls of the body, require frequent changes and stock of rubber blades;

- direct-flow air flow only pushes the mixture, not having time to mix it with air;

- during technological stops, a dense plug is formed in the hopper of the mixture receiver, which complicates the subsequent smooth start-up of the mechanism.

The objective of the invention is to increase the reliability of the device for shotcrete and the expansion of its use in construction.

The essence of the invention lies in the fact that the mixer-activator is made in the form of a screw with the opposite direction of the turns to the center of the bottom of the housing, where the bottom hole is located for the mixture to exit into the screw feeder. The screw feeder is attached from the bottom of the central bottom hole perpendicular to the longitudinal axis of the mixer-activator, with a separate power drive. The screw feeder feeds the mixture to the purge nozzle and aerosol mixer, which are placed at right angles to the end of the screw feeder, where the air duct from the compressor is supplied.

The bottom of the hopper of the mixer-activator, in the area of the mixing and feeding blades, on both sides of the discharge window, can be made of elastic material with the possibility of its opening for cleaning the hopper-mixer.

The device is illustrated by the following drawings:

figure 1 is a longitudinal section of the device, which shows the mixer-activator, the bottom hole and the screw feeder attached to it at an angle of 90 degrees;

figure 2 is a cross section of the device.

At the bottom of the housing 1 there is a mixer-activator 2, and a screw feeder 3 is installed in the center of the hopper, from one end of which a drive mechanism for screw feeder 4 is installed, and at the other end, a purge pipe 5 with an aerosol mixer 7 is attached. At the top of the screw feeder 3 there is a bottom hole 6 for the exit of the mixture from the hopper. The activator mixer 2 has counter-feed screws in the center to the bottom hole 6, through which the screw feeder 3 picks up the mixture and delivers it to the purge pipe 5 with an aerosol mixer 7, and then the concrete mixture is sprayed through the material wire 8 to the place of laying. An air drive 9 from the compressor is attached to the purge pipe 5. At the end of the housing 1, a gearbox 10 and a power motor 11 are mounted. The lower parts of the bottom of the housing 1, on both sides of the bottom hole 6, are made of elastic material 12 with locks-latches 13, to clean the hopper housing 1 from the remnants of the mixture.

The device operates as follows.

The mixer-activator 2 with its rotation of the blades feeds the mixture towards the center of the bottom of the housing, where the bottom hole 6 is located, which goes into the screw feeder 3 and works from a separate power drive. The mixture is supplied with some amplification to the device at the end of the screw feeder 3, where it falls under a stream of compressed air from the purge pipe 5, while the compressed air rotates the aerosol mixer 7, turning the mixture into a concrete aerosol, and it, in turn, goes through the material hose 8 to the place styling.

Technical results of the claimed proposal:

- the combination of the proposed features ensures the reliable operation of the proposed device, providing high-quality mixing of the mixture in the mixer and in the spray using compressed air, obtaining high-quality aerosol mixture;

- the design of the proposed device eliminates jamming of the rotor, reduces wear of the blades, reduces the complexity of its operation;

- favorable aerodynamics were created in the line of compressed air located in the hollow shaft of the screw, an aerosol mixer and a material hose attached to it were conveniently and easily accessible.

Claims (1)

A device for wet shotcreting, comprising an activator mixer and a feeder connected with it with a purge hole, characterized in that the activator mixer is made in the form of a screw with the opposite direction of the turns to the center of the bottom of the housing, where the bottom hole for the mixture to exit into the screw feeder is located, the screw feeder is attached to the bottom of the central bottom hole perpendicular to the longitudinal axis of the activator mixer with a separate power drive, the screw feeder feeds the mixture to the purge pipe and aerosol in a mixer, which are placed at a right angle at the end of the screw feeder, which supplied the air line from the compressor.

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