Pneumatic control device

A pneumatic control device adapted to be fluidly connected to a pneumatic supplier, comprising:

• a base seat unit having an axial hole that extends along an axial line, an intake channel that is adapted to be fluidly connected to the pneumatic supplier, a first retaining space that is fluidly connected to said intake channel, a second retaining space that is fluidly connected to said intake channel, a first guide channel that fluidly communicates said first retaining space with said axial hole, a second guide channel that fluidly communicates said second retaining space with said axial hole, and a vent hole that fluidly communicates said axial hole with external environment;
• a first rotation control unit installed in said first retaining space, and operable to move between at an action position whereat fluid communication between said intake channel and said first guide channel is permitted, and a non-action position whereat the fluid communication between said intake channel and said first guide channel is prevented;
• a second rotation control unit installed in said second retaining space, and operable to move between an action position whereat fluid communication between said intake channel and said second guide channel is permitted, and a non-action position whereat the fluid communication between said intake channel and said second guide channel is prevented;
• a cylinder unit installed in said axial hole of said base seat unit, and able to drive a first rotational movement about the axial line upon receipt of fluid from said first guide channel and to drive a second rotational movement opposite to the first rotational movement upon receipt of fluid from said second guide channel;
• an output unit installed in said axial hole of said base seat unit, and connected to an end of said cylinder unit along the axial line for outputting the rotation generated by said cylinder unit;
• and
• a time-delay unit mounted to said base seat unit, and including a delay switch that is adapted to be fluidly connected to the pneumatic supplier, a flow-limiting valve that is connected downstream of said delay switch, a pressure accumulator that is connected downstream of said flow-limiting valve, and a control valve that is connected downstream of said pressure accumulator and that is fluidly connected to said first retaining space and the pneumatic supplier;
• wherein said delay switch is operable to move between an action position and a non-action position, when said delay switch is at the action position, said control valve permitting fluid communication between the pneumatic supplier and said first retaining space therethrough, when said delay switch is moved to the non-action position, said control valve maintaining the fluid communication between the pneumatic supplier and said first retaining space fora period of time and then preventing the fluid communication between the pneumatic supplier and said first retaining space.