Actuator and spool type directional control valve

An actuator, used for controlling the movement and displacement of a spool, wherein, the actuator comprises:

• a catcher, provided with a first connecting portion and a second connecting portion, wherein the first connecting portion is used for connecting to the spool, and the second connecting portion comprises a first limiting portion and an avoidance slot which are connected in a circumferential direction;
• and
• a shaft, comprising a shaft body and a control member, wherein the shaft body is used for connecting to an operation mechanism and is driven to rotate by the operation mechanism so as to enable the control member:
• to abut against the first limiting portion, and drive the catcher to rotate forward by a first angle a via the first limiting portion, so as to drive the spool to move forward to a first working position;
• and
• to rotate freely in the avoidance slot, wherein a maximum rotation angle c of the control member in the avoidance slot is not less than the first angle a;
• wherein, an end of the shaft body is provided with an open groove;
• the control member is a connecting block located in the open groove, and one end or two ends of the connecting block extend out of the open groove in a radial direction of the shaft body to cooperate with the second connecting portion;
• wherein, the actuator further comprises:
• a bottom plate structure which is provided with a limiting slot;
• and
• an elastic member which is located in the shaft body, and is used to provide an axial preload force for the control member, so that the control member is pressed into the limiting slot;
• wherein, the actuator further comprises a mechanism body, and the mechanism body is provided with an internal cavity capable of accommodating the catcher;
• the bottom plate structure is fixed in the internal cavity;
• and
• an end of the shaft extends into the internal cavity and penetrates through the catcher to cooperate with the bottom plate structure.