An internal and external clamping device comprising a first pull rod, a second pull rod, an inner cylinder, an outer sleeve, a wedge-shaped sleeve, a hook, a clamping cylinder, a threaded push rod, a support claw ring, a spring, a washer, a nut, a support block, a rotary shaft, a jacket, a flange bush and a support plate;
- the first pull rod and the second pull rod are connected with each other and respectively provided with a flange;
- the second pull rod is connected with the inner cylinder, and connected at another end with the threaded push rod, the first pull rod being disposed at one end of the second pull rod, the inner cylinder being provided on an outer side with the outer sleeve;
- the inner cylinder is provided on an outer periphery in a ring direction with a plurality of guide key grooves, which are provided inside with guide keys;
- the outer sleeve is provided with a guide groove on an inner cylindrical surface corresponding to a periphery of the guide key groove of the inner cylinder, and connected at one end to a main shaft of a machine tool and at another end to the jacket;
- the wedge-shaped sleeve is connected at one end to the inner cylinder, and at another end to the clamping cylinder, the another end of which is arranged in a wedge-shaped surface of the jacket;
- the wedge-shaped sleeve is provided on an outer peripheral surface with a plurality of hooks at intervals, which are provided with steps at the right end;
- the clamping cylinder is provided on both sides of an outer wall with a wedge-shaped surface having a same inclination angle as an inner side of one end of the wedge-shaped sleeve and an inner side of the jacket;
- the clamping cylinder is provided on an outer circumference with an annular groove, which is connected to the step on the hook;
- the clamping cylinder is provided with a plurality of grooves at intervals in a circumferential direction from both ends to a middle;
- a plurality of support blocks are spaced to form an annular structure around the flange bush;
- a middle portion of each support block is provided with a through hole;
- a support claw is provided between every two support blocks, and a side surface of the support claw is provided with the through hole;
- a rotary shaft penetrates through the through holes in the support claws and the support blocks;
- a plurality of rotary shafts are spaced to form an annular structure around the flange bush;
- the flange bush, arranged between the inner cylinder and the second pull rod, is provided at one end with a flange, which is provided at one end face with grooves identical to the support blocks in number and shape, with the support block fixed in the groove of the flange of the flange bush;
- the other end of the flange bush is connected through the flange to the support plate, which is connected to the outer sleeve;
- a round step is arranged on the threaded push rod, on which the spring, the washer and the nut are sleeved;
- a plurality of support claws are spaced to form the support claw ring having the annular structure;
- each support claw is formed by connecting a front end, a rear end, and a bottom;
- the outer surface of the front end, used to press against an inner wall of a thin-wall tubular part, is an arc surface with the same curvature as the inner wall of the thin-wall tubular part;
- the spring is connected at one end to the bottom of the support claw ring, and at the other end to the washer, with a nut arranged outside the washer;
- the support claw ring is placed inside the clamping cylinder, and the thin-wall tubular part is placed between an outer surface of the support claw ring and an inner surface of the clamping cylinder.