Gateway source device and radiotherapy equipment applying same

The invention discloses a source turning-off device, a source turning-off mechanism comprises a source turning-off rod and a driving assembly, the source turning-off rod is connected with the driving assembly, and the source turning-off mechanism is used for turning on and turning off a treatment head; under the normal power-off condition of the electric control system, automatic power-off is realized; under the condition that an electric control system cannot normally close a source, manual source closing is achieved, in the manual source closing device, under the condition that the electric control system cannot normally close the source, an operator pulls a pull ring, a source closing rod and a manual source closing rod are pulled through the action of a steel wire to rotate, the hole position of a source switch and the hole position of a collimator are completely staggered, ray source beam outgoing is closed, and manual source closing is achieved. After the source is manually closed, the source closing ou