PORTABLE INSTALLATION AND A METHOD FOR WATERJET CUTTING OF MATERIALS CONTAINING INFLAMMABLE AND EXPLOSIVE SUBSTANCES Russian patent published in 2022 - IPC B24C1/00 B24C3/06 F42B33/06 

FIELD: material processing.

SUBSTANCE: group of inventions relates to the field of processing materials by waterjet cutting with the ability to work in conditions of low ambient temperatures, including use for the elimination, cutting of products containing fire/explosive substances. When waterjet cutting metal materials, the surface of which contains fire/explosive substances on the surface of the processed material, the cutting jet head is placed, bringing it to the surface of the cutting zone. Abrasive material is fed into the cutting head and a high-speed flow of liquid under pressure is mixed in it with abrasive particles until a water-abrasive medium of uniform consistency is formed with its supply from the nozzle to the surface of the material, carrying out shock loads on it during subsequent movement. Cutting of the material is carried out by introducing abrasive particles with sizes from 0.15 to 0.25 mm in a ratio of 1:10 to the carrier flow into the liquid flow at a pressure of 16 to 18 MPa. The dosing of the abrasive material is carried out by loosening it in a container with cooled compressed air and periodic abrupt release of its pressure into the atmosphere. The number of air compression and decompression cycles is regulated, the compressed air temperature is maintained at a level from 3 to 5°C above the “dew point” temperature relative to the ambient temperature. The movement of the cutting jet head is carried out at a speed of 150 to 200 mm per minute with an angle of inclination from 18 to 30° in the direction of the cut using a movable carriage. The portable installation for waterjet cutting of metal materials in the manner described above contains a cutting head, a pressurized liquid supply system to it, a container with abrasive material, a unit for supplying abrasive material to the mixing zone in the cutting head. It also contains a pneumatic valve for supplying compressed air from the dehumidifier to the upper cavity of the container with abrasive material, interacting with an electronic control unit for the dehumidifier modes, a dew point temperature sensor and a compressed air humidity meter.

EFFECT: increase in the stability of the installation and an improvement in operational characteristics is ensured by a metered and uninterrupted supply of abrasive material to the cutting jet head at low ambient temperatures.

2 cl, 2 dwg, 1 tbl