Hydrostatic testing machine is the main production equipment of welded pipe. At present, the hydraulic testing machine is used in the production of welded pipe, its working process is: feeding, clamping, water inlet, pressure, pressure, pressure relief, pressure.
Flow rate is the basic motion cycle of hydraulic press. The modern hydraulic testing machine is controlled by PLC, which makes each working process complete automatically in turn, and has the function of automatically recording the test efficiency parameters.
According to the sealing types of radial seal and end face seal, hydraulic press can be divided into two types. The radial seal is used to weld the inner and outer sealing rings of the pipe together. The sealing purpose is achieved through the compression and expansion process of the sealing ring. The advantage is that the steel pipe clamp and exit are easy, the sealing is good, the axial force of the steel pipe is small, and it is not easy to bend, but the structure of the head is relatively complex, and the blind area of the pipe test exists.
The end face seal depends on the pressure between the sealing materials and the end face of the pipe mouth to achieve the purpose of the pipe mouth seal. The advantage of the end face seal is that the structure of the test head is simple and the versatility is good, but the function of the sealing materials, the oil-water ratio and the pressure servo control system require higher requirements.
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