What are the different working principles between hydraulic and mechanical pipe expanders?

What are the different working principles between hydraulic and mechanical pipe expanders?

1, Hydraulic expansion pipe machine: It is a specialized hydraulic expansion joint equipment used for the expansion connection of pipes and tube sheets in the manufacturing of heat exchangers, condensers, high-pressure heaters, and other equipment. The use of hydraulic expansion joint technology has advantages such as low manufacturing cost, light labor intensity, short manufacturing cycle, and uniform and reliable expansion joint quality. Hydraulic expansion joint technology has been widely applied in the manufacturing of heat exchangers in fields such as petrochemicals, electricity, boilers, nuclear power, refrigeration, etc., greatly improving the quality and production efficiency of domestic heat exchanger equipment. At present, the third-generation pneumatic hydraulic pipe expanding machine has been developed, and the operation is very simple. Compared to traditional mechanical expansion machines, it has obvious advantages and market prospects.

Hydraulic tube expanding machine

2, Mechanical expansion pipe machine:

In order for users to accurately control the expansion force and time, the equipment adopts a 3-phase variable frequency motor. Compared to the MRS type, it has a more efficient tube expansion speed and more precise force. It can store the parameters of each type of pipe, and can be quickly retrieved when using pipes of the same material. With a digital display, it can clearly display the working conditions of the actual equipment. The most direct experiment to test the effect of tube expansion is the pressure holding and pull-out experiments. Pressure holding test, usually with a pressure of 0.75Mpa, to detect whether the pipe opening is leaking; The standard for pull-out force is a pull-out force of 1Mpa for adhesive expansion and a pull-out force of 4Mpa for strength expansion (pipe plate slotting).

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