Novel transmission locking device

The invention discloses a device capable of achieving transmission locking. The device comprises five main body plates, two gears, two gear shafts, two racks, a rotary knob and two positioning devices. The device is characterized in that the five main body plates are connected through bolts, shaft holes are distributed in each main body plate for fixing the gears, the two gears are installed on the gear shafts which are fixed to the main plate on the lowest layer, the two gears are meshed with each other and meshed with the two racks respectively, the big gear is connected with the rotary knob through a screw and rotates along with rotation of the rotary knob to drive the racks to conduct rectilinear motion, and the rotary knob is provided with two positioning grooves; when the rotary knob moves upwards along the axis, and the positioning devices are clamped into the positioning groove on the lower portion, the racks are made to move by rotating the rotary knob; when the racks move to suitable positions, the rotary knob is pressed, the positioning devices are clamped into the positioning groove on the upper portion of the rotary knob, the big gear is meshed with the fixed gear on the main plate, the gear is locked, and moving of the racks is limited.