Automatic EI-300 lamination stacking machine

Automatic EI-300 Lamination Stacking Machine for Large Power Transformer Core Assembly Line

The EI-300 inserts E & I silicon steel laminations into transformer coil bobbins under PLC control. Positioning accuracy is ±0.02 mm, stacking accuracy ±0.1 mm, and cycle time is adjustable from 1 to 60 seconds, giving up to 250 stacks per minute. It is specified for the 8000-15000 VA band of large power transformers, where a single core carries a lot of lamination and a bad stack is expensive to unwind.

The Question Buyers Ask After Year Two

Almost every stacking machine looks the same on the quotation sheet. The differences that decide whether a plant is still running smoothly in year five are not in the headline price. They are in what happens after the machine is installed: which parts wear, how fast they arrive, and whether anyone on the other end of the line knows the machine.

This page answers that question directly, because for a machine built for 8000-15000 VA cores, the service relationship matters as much as the specification.

What Actually Wears on a Stacking Machine

Three groups of parts account for nearly all scheduled maintenance, and none of them is the PLC or the servo system:

• Lamination contact surfaces. The magazine rails, guide plates and stack chute touch steel strip on every cycle. At 250 stacks per minute they see millions of contacts a year, so they are the first to show burr and wear.
• The gripper and push components. Pick-and-place fingers and the ejection pusher take the mechanical load. Their wear is gradual and shows up first as a drift in stack squareness, not as a stop.
• Consumable guidance. Bushing and alignment pins are low-cost items that keep the other two groups accurate. Replacing them on schedule is what protects the expensive parts.

Everything on that list is a standardised part held in stock, which is why the machine can be kept running without waiting on a custom fabrication order.

What Ships With the Machine

Each EI-300 leaves with a documented handover, not just a crate:

• Wear-parts kit. A first set of the contact and gripper items above, so the first maintenance window does not depend on an international shipment.
• Spare PLC and touch-screen module options held as stocked items, so a control fault is a swap rather than a lead-time negotiation.
• Electrical and pneumatic schematics in the same language as the touch-screen interface, plus the parameter table used at factory acceptance.
• Operation and maintenance manual covering the cycle time setting, stacking accuracy adjustment and the scheduled replacement intervals for the parts listed above.

How Support Works in Practice

Support is organised in three layers, in the order a real fault usually escalates:

1. Online commissioning and training. Installation guidance, parameter setting and operator training are provided free by video call, so the first production run happens with someone watching who has seen the machine before.
2. Remote diagnosis. Because the control system is PLC based with a touch screen interface, most fault conditions can be read and corrected remotely, with the operator following a guided sequence rather than describing a symptom.
3. On-site attendance. Where the fault is mechanical, an engineer can attend site; the cost of travel and accommodation is quoted separately and transparently, with no bundled service contract.

The warranty runs for 12 months from the shipping date and covers the machine, not a subset of it. Wear parts consumed in normal production are excluded, which is why the starting kit is supplied with the unit rather than sold later.

Built to Be Serviced, Not Just Built

The same design choices that make the EI-300 accurate also make it serviceable. The high-strength structural steel frame is bolted rather than fully welded, so a panel can be replaced without cutting into the machine. The PLC is a standard industrial module, not a proprietary board. The touch screen interface exposes the parameters an engineer needs to re-establish stacking accuracy after a part change, instead of locking them behind a factory password.

For a plant running large cores, that means the machine is an asset with a maintenance plan, not a black box with a service hotline.

Technical Specifications

Ordering and Delivery

Minimum order is one unit. Payment is by T/T. Standard delivery is 1-15 working days depending on configuration and stock position, packed in export-grade plywood cases. Installation and operator training are provided free online; on-site attendance is quoted on request.

If you are specifying an EI-300 for a new core line, send us your lamination stack height, core quantity per shift and bobbin dimensions. We will confirm the magazine configuration and return a quotation with the wear-parts list attached, so the maintenance budget is visible before the order is placed.