RU1791133C - Device for jet electrochemical cleaning of metal equipment from hardened concrete remains - Google Patents

Abstract

Usage: in land construction, namely in the operation and repair of metal concrete mixing, molding and transport equipment. SUMMARY OF THE INVENTION: the device comprises a cylindrical hollow electrode having the shape of a surface to be cleaned with a closed end and working openings, a body of dielectric material with channels in it, the axes of which are aligned with the axes of the working openings, a terminal and an electrolyte connection. 2 ill.

Description

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The invention relates to land construction, namely, the operation and repair of metal concrete mixing, molding and transport equipment.

Periodic cleaning of the equipment surfaces from hardened concrete residues is a mandatory technological operation that ensures increased equipment durability, and when cleaning formwork and other molding equipment, the quality of concrete surfaces of manufactured parts and monolithic structures. Promising methods are electrochemical cleaning of metal surfaces from hardened concrete residues by electrolytic etching in a neutral electrolyte medium: anodic and sequential cathodic and anodic.

However, the well-known technological schemes of the bathroom and non-flowless cleaning flow

the electrode does not provide for the removal of foci of contamination in the butt joints of the angular joints vertical and horizontal. surfaces, surfaces of complex shape. These foci are manually removed mechanically.

Closest to the invention is an electrode for electrolytic concrete cleaning of metal processing equipment, made in the form of a hollow cylinder, equipped with a screen at its working end; The screen is made in the form of a ring of dielectric material.

However, with the complex shape of the surfaces to be cleaned, as well as with the location of the foci of contamination under cramped conditions, manual refinement, which increases the complexity of cleaning, cannot be avoided. There is a danger of contact between the worker and the electrode body.

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The aim of the invention is - lower -. laboriousness and safety. . ; /. . . . .. -; -;

The goal is achieved in that the electrode is made with holes, coaxial to the channels and one of its ends is plugged, while the electrode is placed in a dielectric casing and has the shape of a surface to be cleaned.

In FIG. 1 shows a semicircular device with a cut-out, general view; in FIG. section .A-A in FIG. 1. ..

The device comprises a cylindrical hollow electrode having the shape of a surface to be cleaned with a closed end 1 ... And with working holes 2, a body of dielectric material 3, with channels in it 4, the axes of which are aligned with the axes of the working holes, terminals of the electrolyte supply pipe 6. -:: h. , - ,,; .., .....

The hollow cylindrical electrode t and the dielectric body 3 can be made flexible,.:: -;, / ./: The device operates as follows,,. . - .., .....;

The device is placed on the surface to be cleaned. The fitting 6 is connected, for example, with a flexible hose to the electrolyte supply line. An aqueous solution of a neutral electrolyte, e.g. nitrite or sodium nitrate, is washed through electrode 1. Through working holes 2 saturate the cleaned hardened concrete remains. Terminal 5 is connected with a welding cable to one of the poles of the current source, for example, during cleaning by the method in a, c. No. 483258 with a negative pole of a direct current source, and the mass of the surface being cleaned with a positive one. A direct current is passed between the electrode and the surface to be cleaned. When pumping the electrolyte through the central channel of the electrode 1 from the walls, current flows into it. 8 as a result of the movement of the solution flow through the working hole 2, the diameter of which is slightly larger than the diameter of the channel 4 of the dielectric housing 3, the electric charge is uniformly distributed over the cross section of the stream. As a result of this, when

washing off the source of contamination with an electrolyte stream at its contact with the metal results in anodic electrolytic etching, which destroys the structural bonds of the cement stone with the metal. The washing jet removes the destroyed particles of cement stone.: Example, Electrochemical jet cleaning the neck of an SB-94 gravitational cyclic concrete mixer with a drum capacity of 1,500 l. performed in the following sequence. The drum is set to the discharge position above the container to collect used electrolyte. The semicircular device is placed in the lower part of the drum on the surface to be cleaned. A rubber hose connects the device connector to the line. Pumped through the device in

within 3-5 min an aqueous solution of sodium nitrate with a density of 1.1 x 103 kg-g / m3 to saturate the concrete to be cleaned Using welding cables connect the terminals of the welding rectifier VD-301: positive with

the mass of the drum being cleaned, and the device terminals are negative. A current of 3-5 minutes is passed until the inkjet bonds of concrete with metal are broken. The device is removed. Contaminated areas

adhesion to metal is removed. Drum

the concrete mixer is rotated 1/31/2 turn to install the device. Cycle

repeat. Pre-assembled electrolyte

filtered into the highway.

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Claims (1)

SUMMARY OF THE INVENTION An apparatus for the electrochemical blasting of metal equipment from hardened concrete residues comprising a housing, a hollow cylindrical electrode and a dielectric screen, characterized in that, in order to reduce labor capacity and increase safety, the housing is made of dielectric material and with channels, the electrode is made with holes, Coaxial channels, and one of its ends is plugged, while the electrode is placed in a dielectric housing and has the shape of a surface to be cleaned. . . ; -:. .. FIG. Z