Equidistant extension type bus duct

The utility model relates to a bus duct, in particular to an equidistant extension type bus duct, which comprises a fixed shell and extension shells symmetrically arranged on two sides of the fixed shell, and the extension shells on the two sides are in sliding fit with the fixed shell and can synchronously stretch out and draw back along the length direction of the fixed shell. An adjusting mechanism is arranged between the fixed shell and the extension shells, and the adjusting mechanism is used for driving the extension shell on the other side to stretch out and draw back synchronously when the extension shell on one side stretches out and draws back; the adjusting mechanism is further matched with a positioning mechanism arranged on the fixed shell, and the positioning mechanism is used for fixing the extension shell after the extension shell stretches out and draws back to a preset position so that the extension shell can not stretch out and draw back. Through the cooperation of the adjusting mechanism a