Portable Electrical Manual Tube End Expanding Machine
Portable electric tube expander with digital torque control for precise tube-to-tubesheet joints.
Factory technicians expand tubes directly at heat exchangers, boilers, and condensers using this handheld electric tool with precision torque monitoring. Digital controller eliminates manual guesswork by automatically stopping expansion at preset current values, ensuring consistent tube-to-tubesheet joints in production and field maintenance.
Key Specs
Key Specs
Overview Points
Handheld Electric Design
Automatic Torque Shutoff
Auto-Reverse Function
Portable Field Operation
Real-Time Current Display
Multiple Head Compatibility
Differential Rolling Principle
Proven Manufacturing Heritage
Key Features
The controller samples real-time motor current, converts it through an analog-to-digital circuit, and compares the value against a user-defined expansion setpoint. When the target torque is reached, the motor stops automatically. This closed-loop approach delivers uniform tube-to-tubesheet contact pressure across every joint, removing dependence on operator feel and reducing reject rates.
After expansion reaches the preset value, a timed delay circuit triggers automatic counter-clockwise rotation to release the expansion tool from the tube. The controller then disconnects power, completing the full expand-and-retract cycle without manual intervention. This shortens per-tube cycle time and minimizes tooling wear.
The system separates into a lightweight handheld drive unit and a standalone control box connected by flexible cabling. Operators can carry the unit to the workpiece — whether on a factory floor, inside a vessel, or at an outdoor job site — rather than transporting heavy tubesheet assemblies to a fixed machine.
A digital display on the controller shows the actual working current throughout each expansion stroke. Supervisors and QC personnel can verify that every tube met the programmed expansion force, supporting traceability and compliance with pressure-vessel and heat-exchanger assembly standards.
The expander accepts interchangeable working heads with rolling beads engineered for specific tube ODs and wall gauges. With over 300 mould sets available from NTBOBO’s production facility, operators can source expansion heads matched to copper, aluminum, mild steel, or stainless steel tubes used across HVAC, refrigeration, and process industries.
Technical Specifications
The electric tube expander is composed of a tube expander and a digital display controller, and it is accompanied by a tube expander (working head). The main working principle is that when the electric pipe expander drives the pipe expander that is plugged into the pipe hole to rotate clockwise, the expansion bead of the pipe expander has a certain rotation angle with the pipe, so that the pipe expander rotates along the differential pipe while rotating.
The axis is forward, and the expander is thinner and thicker before, so that the expanded tube is gradually expanded during the rolling of the expanded beads, and is in close contact with the wall of the tube sheet. In the process of tube expansion, as the tube expander continues to expand, the torque provided by the tube expander also increases, and the motor current of the tube expander also increases.
After the current is sampled by the digital controller, Amplified analog-to-digital conversion, digital display of the actual working current, compared with the preset expansion tube value through a comparator, the controller controls the motor to automatically stop when it reaches the set value. After the delay interval of the delay circuit, the controller automatically drives the tube expander to rotate counterclockwise, so that the tube expander starts to loosen.
When the release time reaches the preset exit time, the controller disconnects the power supply of the tube expander motor and stops the tube expander to complete a tube expansion process.
Applications
Heat exchanger manufacturing — tube-to-tubesheet expansion for shell-and-tube units
Boiler and pressure vessel assembly and field repair
Condenser and evaporator tube installation in HVAC and refrigeration systems
Power plant maintenance — retubing and re-expanding in confined vessel spaces
Process industry equipment — chemical reactors, oil coolers, and feedwater heaters
On-site service and maintenance where portable expansion tools replace fixed machinery
Video
FAQ
Portable Electrical Manual Tube End Expanding Machine is widely used in: Heat exchanger manufacturing — tube-to-tubesheet expansion for shell-and-tube units; Boiler and pressure vessel assembly and field repair; Condenser and evaporator tube installation in HVAC and refrigeration systems; Power plant maintenance — retubing and re-expanding in confined vessel spaces.
All NTBOBO machines come with a 1-year warranty from the date of Bill of Lading. Our engineering team provides 24-hour technical support throughout the warranty period.
We accept 30% down payment by T/T (Telegraphic Transfer), with the balance due before shipment. Other payment arrangements can be discussed for long-term partners.
Standard delivery is within 10-35 working days after receiving the down payment, depending on the machine model and customization requirements.
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