SU107393A1 - Pneumatic hydro-sandblaster for cleaning metal surfaces - Google Patents

Description

Pneumatic-hydro-sandblaster apparatus for cleaning the surfaces of metal structures, consisting of a nozzle, separate tanks for sand and water, and a pipeline for supplying compressed air to these tanks, are known. A distinctive feature of the proposed apparatus is the supply of a sand-feeding nozzle with a constricted axial channel at the outlet end with a head, which, in conjunction with the outer surface of the nozzle, forms a water supply chamber and a narrow annular gap to release water in the form of a cone-shaped curtain, inside which a rarefied space is created, facilitating increasing the speed of the sand jet and preventing the dispersion of harmful sand sand.

FIG. 1 schematically shows the proposed pneumatic-hydro-sanding apparatus for operation on two nozzles; in fig. 2-nozzle apparatus in section.

The apparatus consists of three pressure tanks.

compressed air (tank /; 1l of sand, tank 2 for water, tank 5 for anti-corrosion solution), pipelines and H1, mangos for air supply 4, sand 5, water b, anti-corrosion solution 7, nozzle 8, bonded to sop, 1 st 9, spray gun 10 d, -1 anti-corrosion solution (the designations of working media are shown in the drawing),

Loaded into the reservoir / sand through taps // and 12 enters chambers 13 and 14, where it is picked up by compressed air injected through the valve, pi 15 and 16 ir through the pgangs to the nozzles 8.

The tank 1 with sand, with the purpose of helping it without stopping the operation of the apparatus, has two compartments: upper-loading and lower-working; for loading sand into the upper compartment, the valve 17 is closed and the valve 18 is opened; in the lower compartment of the tank, the air pressure remains working and the valve / 5 is open, while the air pressure in the upper compartment decreases to atmospheric; after sanding the sand through the upper loading cone 20, valve 18 is closed and valve 17 is opened, and when the pressure is equalized, the lower loading cone 21 opens in both compartments, after which the sand enters the lower working compartment of the tank.

From the water reservoir 2, pressurized air is supplied through the valves 22 and 23 to the hoses and through the valves 24 and 25 to the nozzles 26 of the nozzle head.

The water tank 2 is filled with water through the valve 27; for this purpose, the compressed air valve 28 is closed and the air valve 29 is opened; when filled with water up to the level of the valve 28, the valve: 1 27 and 29 are closed and the valve 28 is opened for compressed air.

The nozzle 8, podayungee sand on axial narrowing: Luz Kana; provided on the output ring with a head 9.

The outer surface of the exit end of the nozzle 8 forms with the body of the head 9 a water chamber 30, into which Bykho.scht nozzle 26, and a narrow annular gap 31 between them. The water leaving the annular gap forms a water curtain in the form of a truncated hollow cone around the stream of sand emerging from the nozzle. Due to this curtain, dry sand and water are supplied separately from each other without mixing them all the way (up to and including the surface) and, besides, a rarefied space is created (inside the water curtain), which increases the speed of the sand stream; at the same time preventing the dispersion of harmful sand dust at the workplace.

From the tank 3 anti-corrosion solution under the pressure of compressed air flows through the valve 32 through the hose into the spray gun 10; air enters the tank through valve 33, water through

valve 34; salt for anticorrosive solution is introduced through plug 35.

Separately, the operation performed by the P1 EHM sandblasting unit, washing the cleaned surface with water or drying the surface with an air blast, is performed by closing and opening the corresponding valves and taps.

Subject invention

Claims (2)

1. Pneumo-hydro-sandblasting apparatus for cleaning metal surfaces, consisting of a nozzle, separate tanks for sand and water, and a pipeline for supplying compressed air to these tanks, characterized in that, in order to increase the speed of movement of the sand jet and keeping the sand dry. m pa all the way of its movement to the excisable surface inclusively; the sand feeding nozzle with a tapering axial channel is provided at the outlet end with a die, forming in conjunction with the outer surface of the nozzle water gaps and a narrow annular gap for water to flow out in the form of a cone-shaped curtain, designed to create a sparse space inside its space, contributing to an increase in the speed of movement of the sand jet and to prevent sand dust harmful to health from scattering. 2. A pneumatic - hydro - sand blasting apparatus according to claim 1, characterized in that in order to meet the possible requirements for protecting the cleaned surfaces from corrosion, it is provided with a reservoir for an anti - corrosive solution supplied under compressed air pressure to the spray gun to coat the cleaned surface with a protective film. FIG. one 17 Conditional oSosHOt SHUfl -air sand -water and anti-corrosion solution 29 FIG. 2