Quick-pressing fixture for friction stir spot welding, and use method thereof

A quick-pressing fixture for friction stir spot welding, comprising a stationary working box (1) and a welding platform (2) integrally connected at a top end of the working box (1), wherein,

• a welding base (3) is provided with a positioning groove (30) for precise placement of a welding material, an opening is formed in one side of the positioning groove (30), the welding platform (2) is provided with a plurality of parallel T-shaped grooves (20) for horizontal sliding of the welding base (3), the welding base (3) is further provided with a guide groove (31) integrally connected to the positioning groove (30), and a limiting slide plate (32) is slidably connected in the guide groove (31) of the welding base (3);
• a welding press block (4) abuts against the welding base (3) and limits the downward pressing on the welding material located in the positioning groove (30) of the welding base (3), and the welding press block (4) is distributed movably;
• the pneumatic quick-pressing mechanisms (5) are configured to clamp the welding material;
• the pneumatic quick-pressing mechanisms (5) are symmetrically disposed on two sides of an upper surface of the welding platform along a width direction of the welding platform;
• the pneumatic quick-pressing mechanism (5) comprises a support base (50), a pneumatic cylinder (51), an operating crank (52), a support frame (53), a press block (54) and a first pressure sensor (55);
• the support bases (50) are symmetrically mounted at two sides of a top end of the welding platform along a length direction of the welding platform, the pneumatic cylinder (51) is hinged to one side of the support base (50), an output end of the pneumatic cylinder (51) obliquely extends outward, and the operating crank (52) is hinged to the support base (50) by means of the support frame (53);
• one side of the operating crank (52) is hinged to the output end of the pneumatic cylinder (51) each other, the other side of the operating crank (52) is hinged to the press block (54) each other, a bottom of the press block (54) is provided with the first pressure sensor (55) which monitors a pressure for pressing the welding press block (4) in real time, and the press block (54) and the first pressure sensor (55) remain in a horizontal state at all times;
• the press block (54) is further provided with a suction mechanism (8), the suction mechanism (8) comprises a suction machine (80), a wire (81) and a trigger lever (82), the suction machines (80) are disposed on two opposite sides of two press blocks (54), and a suction opening (84) is formed in an end of the press block (54) close to the suction machine (80);
• the wire (81) is mounted on a back side of the suction machine (80), the middle of the wire (81) is provided with two metal trigger sheets (83), the two metal trigger sheets (83) are symmetrically disposed in the press block (54) in a height direction of the press block (54), the metal trigger sheet (83) on one side is slidably disposed, the metal trigger sheet (83) on another side abuts against an inner wall of the press block (54), the trigger lever (82) abuts against the slidably disposed metal trigger sheet (83), and the trigger lever (82) slidably penetrates the press block (54) and extends toward the welding press block (4);
• and
• a linkage lever (85) is further connected to one side of the trigger lever (82), an opening-closing door (87) slidably mounted in the suction opening (84) of the press block (54) is disposed at an end of the linkage lever (85) remote from the trigger lever (82), and a reset tension spring (86) is connected between the opening-closing door (87) and the press block (54).