SIASUN SR220A-220/2.66 (SR220A-220/2.66)

A datasheet number only matters once it is hanging on the end of an arm. The SIASUN SR220A-220/2.66 carries 220 kg (485 lbs) at a reach of 2600mm, and SIASUN has spent its engineering effort on making sure that this load does not turn into flex, drift or lost time at the tool. For a plant that has outgrown medium-payload robots but does not want a clumsy giant, that balance is the whole point of the model.

The product is available through this page, by quotation.

Background

SIASUN and the A-series lineage

SIASUN is a robotics brand that builds industrial robots in several payload classes, and the SR220A-220/2.66 belongs to its large-payload family. The series offers a range of load capacities and arm reaches, so a buyer can match the arm to the job instead of bending the job around one standard model. A near neighbor is the SIASUN SR210A-210/2.65, and the range reaches up to models such as the SIASUN SR360A-280/3.20.

The model code carries the payload class and the reach of each arm. Its sibling, the SIASUN SR220A-125/3.10, shares the same arm family but is a different version with its own load and reach, so the figures on this page belong to the SR220A-220/2.66 only.

What sets the technology apart

Four design choices define this robot. The first is the structure: SIASUN describes a high-rigidity design with overall rigidity improved by over 17%. The second is the gearbox, a forward-designed, all-new 220 five-axis backlash-free structure, which is credited with that same 17% rise in machine rigidity. The third is motion planning, where NURBS transition and variable-speed variable-acceleration planning allow faster and more stable operation and improve spot welding cycle time by over 11%. The fourth is the wrist, which uses a custom high-inertia motor from SIASUN's own brand and increases the allowable end-effector inertia by 8%.

Protection is the fifth point. A customized aviation plug sealed cover gives IP54 for the whole machine and IP67 for the wrist, which matters where spatter, dust, coolant or washdown reach the end of the arm.

Technical Specifications

Specifications as published by the manufacturer; confirmed against the datasheet at quotation.

The manufacturer has not published the weight, the axis speeds, the axis ranges of motion, the power supply, the controller model, the mounting options, the wrist moment and inertia ratings, the contents of the box, the operating temperature or the dimensions; they are confirmed at quotation.

What makes the SR220A-220/2.66 different from a standard heavy-payload arm?

Many heavy arms are strong but soft. They can lift the load, yet the arm and the gearing give a little under acceleration, and the tool needs time to settle before it is accurate. SIASUN attacks this at the source. The gearbox was designed forward, not adapted from an older platform, and its backlash-free five-axis structure is what lifts overall rigidity by 17%. A stiffer arm settles sooner, and a robot that settles sooner can start its next move sooner.

The software follows the same logic. NURBS transition smooths the path between points, and variable-speed variable-acceleration planning lets the robot push harder where the move allows and ease off where it does not. The result named in the source is an improvement of over 11% in spot welding cycle time. That is a statement about spot welding, and this page does not extend it to other processes.

Then there is the wrist. A custom high-inertia motor raises the allowable end-effector inertia by 8%, which gives more room for a bulky gun or gripper. Together with the ±0.06mm repeatability, it makes the arm a sound match for tools that are heavy and also have to be placed with care.

How well is the SR220A-220/2.66 protected?

The robot is rated IP54 as a whole machine and IP67 at the wrist. The sealed cover over the customized aviation plug is the feature that delivers this. In practice, the wrist is the part that works closest to the process, where it meets splashes, fine dust and cleaning water, so a stronger rating there is where it counts. The rest of the machine carries IP54.

Who is the SR220A-220/2.66 for?

The first group is automotive and metal-fabrication plants that run spot welding lines, because the cycle time gain and the rigidity were designed with that work in mind. The second is integrators who build cells around heavy end-effectors and need payload and wrist inertia margin. The third is manufacturers who handle large or dense parts and want a repeatability of ±0.06mm at that load.

If the job needs a different balance of load and reach, the series gives options. The SIASUN SR220A-125/3.10 is a separate version with its own load and reach, and the SIASUN SR270A-270/2.70 is worth a look for a different class of work. Browse the whole Large Payload category or the wider Industrial Robots range to compare.

What is the SR220A-220/2.66 used for?

1. Spot welding. The motion planning is aimed at shorter spot welding cycle times with stable movement of a heavy gun.
2. Heavy material handling. A payload of 220 kg (485 lbs) suits moving large castings, stampings and assemblies.
3. Machine tending. Heavy-payload arms of this class load and unload large workpieces in machining and forming cells.
4. Palletizing and depalletizing. Heavy loads and a long reach suit stacking bulky goods, subject to the cell layout.
5. Assembly of large components. Rigidity and ±0.06mm repeatability help when big parts must be positioned with care.
6. Work in harsh wrist environments. The IP67 wrist is meant for tools exposed to dust, moisture or process residue.

Pricing and Availability

Pricing is arranged by quotation, so please send us your application, the tool you plan to mount and the quantity you need. Delivery, customs and support are arranged with the quotation. The SIASUN SR220A-220/2.66 is available on this page.

Frequently Asked Questions

What payload and reach does the SR220A-220/2.66 have?

The payload is 220 kg (485 lbs) and the reach is 2600mm. Both figures are for the SR220A-220/2.66 version.

How accurate is it?

The repeatability is ±0.06mm.

What protection rating does it carry?

The wrist is rated IP67 and the whole machine is rated IP54. A customized aviation plug sealed cover achieves this.

What does the backlash-free gearbox do?

The all-new 220 five-axis backlash-free gearbox structure increases overall machine rigidity by 17%. A stiffer arm holds its position better under load.

Does it help with spot welding cycle time?

Yes. NURBS transition and variable-speed variable-acceleration motion planning improve spot welding cycle time by over 11%.

Are weight, axis speeds and dimensions listed?

Not on this page. Tell us what your cell layout requires and we will come back with the details in the quotation.

Where can I buy the SR220A-220/2.66 and what does it cost?

You can request it through this page, by quotation. The cost depends on your configuration and delivery, so we give no figure here and provide it with the quotation.

Summary

The SIASUN SR220A-220/2.66 is about keeping a heavy load under control: 220 kg at 2600mm, a gearbox that raises rigidity by 17%, motion planning that cuts spot welding cycle time by over 11%, and a wrist rated IP67. If a heavy, accurate and well-protected arm is what your line needs, this page is the starting point.