Patent CA-3104223-A1 (CA)
Inventor: IL'IN SERGEI VLADIMIROVICH
IPC: B23B47/00
Filed: 2019-12-30
Abstract: The invention relates to the field of mechanical engineering, namely to process equipment for nuclear power industry. The objective of the present invention is to ensure the convenience and safety of work when performing process operations for cutting trepans at one workplace in a limited space of the repair cabin. The technical result achieved by the proposed invention is to ensure the accuracy of the alignment of the cutting tool and reduce the cutting tool installation time and, as a result, reduce the radiation exposure loads on the service personnel. This technical result is achieved due to the fact that the device for holes and trepans cutting containing a mechanism of rotation and feeding of the cutting tool and a movable platform is, according to the present invention, further provided with a box-shaped repair cabin performing the role of a device body, with a through hole made in a vertical wall of the repair cabin, the said hole accommodating a positioning sleeve mounted with an inner flange facing the inside of the repair cabin and an outer flange fixed outside the repair cabin, with a mounting fixture secured on the inner flange of the positioning sleeve, where the said mounting fixture comprises a mounting plate fixed on the inner flange of the positioning sleeve and a rotating positioning plate pivotally installed on the mounting plate with a possibility of rotating around the vertical axis, where the mounting plate and the rotating positioning plate are provided with a mechanism for fixing in the closed position, the movable platform is provided with height-adjustable rotatable wheel supports installed inside on the bottom of the repair cab and rigidly attached to the gusset of the rotating positioning plate, the mechanism of rotation and feeding of the cutting tool is installed on the movable platform with the mounting and rotating positioning plates being in the closed position coaxially with the positioning sleeve, and a catcher is fixed on the outer flange of the positioning sleeve for primary storage of cut trepans and collection of chips. Preferably, the movable platform of the device for holes and trepans cutting is a spatial truss with height-adjustable rotatable wheel supports. The device for holes and trepans cutting may be provided with a fixture for branding trepans before cutting the same, including a hollow cylindrical body, end covers installed at the ends of the cylindrical body having groove holes made on them along the diameter line, connected to each other in pairs on different end covers by through guide tubes placed inside the cylindrical body, a rod for branding trepans placed in one of the guide tubes, with a removable striker at one end and a digital stamp on the other, and removable plugs installed in the other guide tubes, where the outer surface of the cylindrical body is made according to the running fit for installation inside the positioning sleeve, and the space inside the cylindrical body between the guide tubes is filled with lead shot to a part of the length of the cylindrical body. The device for holes and trepans cutting is preferably provided with a lead safety plug installed in the positioning sleeve from the end facing the inside of the repair cabin. The mechanism of rotation and feeding of the cutting tool of the device for holes and trepans cutting may be implemented in the form of a drilling machine, preferably pneumatic, and the cutting tool is implemented in the form of a core drill. A drilling fixture of the device for holes and trepans cutting may be made in the form of a hollow cylinder provided with end caps installed at its ends, with central holes made in them, interconnected by a hollow tube configured to accommodate an ejector and to supply a cooling fluid to the cutting tool, where one of the end caps has a mounting bore for installing the cutting tool, and the other end cap is configured to be installed and fixed in the chuck of the drilling machine.