Automatic constant pressure squeezing clamp of transfusion bag

The utility model discloses an automatic constant-pressure extrusion clamp of infusion bags which consists of a left splint (1), a right splint (1') and a connecting shaft (2). The utility model is characterized in that a tension spring (3) and a wire drawing (4) are arranged on the lateral side of the left splint (1), and a fixed-plate (17) is arranged on the lateral side of the right splint (1') which perpendiculars to the right splint (1'); an upper pressure swing bar (8) is fixed on the front surface of the fixed-plate (17) by a rotation axis (7); drawing wire (4) passes by an pulley (5) which is under the left splint (1), passes through a hole in the lower end of a pressure swing pole (8) and a hole in a block (19); the ends of the wire drawing (4) fixedly intertwines a rolling wheel (6) which rotates under the control of a mini low-speed motor (11) and the pressure swing pole (8). The extrusion clamp not only has the function of increasing pressure but also can keep automatic constant pressure so that c