The invention discloses a clamping mechanical arm with a self-adjusting clamping force. The clamping mechanical arm comprises a motor, the inner circumference of a vertical
pipe is fixedly connected to the outer circumference of the motor, the upper end of a rotating shaft of the motor is fixedly connected with the lower end of a screw rod, a screw nut is installed on the outer circumference of the screw rod in a threaded mode, a bearing of the outer circumference of the screw nut is connected with the inner circumference of a sleeve
pipe, a first limiting device for limiting the rotation of the screw nut is arranged on the inner side of the sleeve
pipe, the upper end of the screw rod is connected with the lower end of a telescopic shaft, the upper end of the telescopic shaft is fixedly connected to the middle of the top side of a rotating plate, a bearing of the top side of the rotating plate is connected with the bottom side of a coaxial first
helical gear, and a second limiting device is arranged between the rotating plate and the first
helical gear. According to the clamping mechanical arm, the structure is simple, the conception is ingenious, the linear moving clamping and theshearing moving clamping are combined, thus the advantages and disadvantages of the two clamping
modes are complemented with each other, a large clamping range is retained, meanwhile the volume can be adjusted, convenient use is achieved in a narrow space, two clamping structures are driven by one motor, the structure is simpler, the production cost is saved, the market demand can be met, and theclamping mechanical arm is suitable for popularization.