Mechanical pipe fitting bulging device

The invention discloses a mechanical pipe fitting bulging device which comprises a stand main body, a main pressure oil cylinder, an upper die block, a lower die block, closed hydraulic plungers, a hydraulic system, a clamping control switch and an electric control system. The closed hydraulic plungers are arranged on both sides of the upper die block and the lower die block. The mechanical pipe fitting bulging device is characterized by also comprising a crank arm link mechanism and a guide mechanism, the crank arm link mechanism is hinged with the main pressure oil cylinder, the stand main body and the upper die block respectively. One end of the guide mechanism is fixedly connected with the stand main body, and the other end is fixedly connected with the upper die block. The mechanical device can increase the forming force of equipment and has the same effect on high pressure bulging in pipe fittings as big tonnage hydraulic equipment, so that the purchase cost of the equipment is reduced; and the production efficiency is improved due to the mechanical device. Compared with similar equipment, the mechanical pipe fitting bulging device has the advantages of small size and low energy consumption; and the performance conforms to production requirements, and the cost is reduced to 10-20% that of the similar equipment.