The Structure and Application of Tube Expander

The Structure and Application of Tube Expander

The tube expander consists of expansion beads, expansion rods, and expansion shells. Expansion beads, also known as rollers, are components that undergo plastic deformation by rolling on the inner wall of a pipe. Expansion rods, also known as mandrels, are components that use rotation to expand the expansion beads outward; Expansion shell, also known as roller frame.

The purpose of a pipe expander is to manufacture or replace old pipes, which can expand the metal pipe wall and tightly integrate with the end plate of the pipe mouth, achieving the effect of pressure sealing.

The structure of the tube expander: The four types of tube expanders, including straight tube, flanging, deep hole, and bearing type, must first retract the expansion shell to the small end of the expansion rod, then extend the tube expander into the tube, and then push the expansion rod forward to make the expansion rod, expansion ball, and inner wall of the tube tightly adhere to each other. Then, use a ratchet wrench or tube expander to drive the expansion rod to rotate clockwise, and the expansion rod will automatically move forward. The expansion ball will rotate and roll against the inner wall of the tube, causing the metal wall of the tube to expand until the expansion joint requirements are met.

How to choose Changzhou expansion pipe machine

The expansion tube machine is composed of an expansion tube machine and a digital control instrument, mainly used for connecting heat exchange tubes and tube sheets. Previously, there were several methods for connecting heat exchange tubes and tube sheets, including expansion joint, welding, and expansion welding combined. However, expansion joint methods can be divided into mechanical expansion joint, hydraulic expansion joint, rubber expansion joint, and explosive expansion joint.

Expansion tube machine

The hydraulic pipe expander used in the hydraulic expansion technology of domestic pipe expanders is composed of high-strength alloy steel core rods and high-pressure imported elastic rubber, with an integrated design that can withstand ultra-high pressure without the need for sealing components. It is convenient to use and has high work efficiency. The tube expander is driven by the tube expander inserted into the tube hole to rotate clockwise because there is a rotation angle between the expanding ball of the expander and the tube. When the expander rotates, it moves forward along the axis of the tube, causing the rolling of the expanding ball to slowly expand the tube and tightly connect with the wall of the tube plate hole.

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