This machine is increased 75-type high-pressure locking tube machine, the production of hydraulic support used in the repair of high-pressure hose pipe head and jacket, pressed together the core of special equipment. 2. The composition and the main technical features of the machine consists of the withholding mechanism, motors, gear pumps, control valves and tank components. Buckle Pressure: 740 tons Motor Type: Y132M-4 Power: 7.5KW speed: 1440r / min gear pump Model: CBF-E540-ALPL relief valve Model: YF-L20H3-S valve Model: 34SM-L20H-W Tank Capacity: 100kg device dimensions (L × W × H): 2000 × 850 × 1500 Weight: 1200kg Second, the working principle and working process withhold agency is working body of the machine. Compression achieve reciprocating motion driven by the cylinder plunger spring indenter fixed mandrel constantly pressing and relaxation, the packed tube head, coat the core is placed in the middle of spring indenter hole, start the motor, pump, control valve, the cylinder plunger movement driven by tapered gland wall, pressing with the same tapered outer spring indenter to achieve lamination purposes. Change back, press sets the opposite direction, the spring ram recovery, will remove the high pressure hose fitting.