DEVICE FOR SYNCHRONOUS TIGHTENING AND LOOSENING OF BOLTS OF DRIVES OF CONTROL ELEMENTS OF CONTROL AND PROTECTION SYSTEM Russian patent published in 2025 - IPC B25B21/00 G21C7/00 B23P19/06 

FIELD: nuclear physics; nuclear engineering.

SUBSTANCE: present invention relates to the field of maintenance and repair of reactors of nuclear power plants, specifically to a device for synchronous tightening and loosening of bolts of drives of control elements of a control and protection system. Device for synchronous tightening and loosening of bolts of drives of control and protection system of reactors of nuclear power plants includes input shaft 1, differential assembly 4 and two output shafts 6, one end of input shaft 1 interacts with the fastening tool to effect the fastening force input, the other end is installed together with the input end of differential assembly 4, two output ends of differential assembly 4 are connected to one end of two output shafts 6, respectively, and the other end of each of two output shafts 6 has the possibility of being connected, respectively, to the rod of one of the two symmetrically arranged bolts for the bolts to be twisted and unscrewed, wherein the other end of output shaft 6 is a hollow cylinder with a U-shaped groove for connection with the square head of coupling 8 by means of anti-slip key 7, and this key 7 is made with possibility of torque transfer from output shaft 6 to the square head of coupling 8.

EFFECT: possibility of synchronous loosening or tightening of bolts located in diagonal position, which provides high efficiency of operation.

6 cl, 2 dwg