Chaifu's robot rated at 5 tons lifts a car in Shanghai

At the 26th China International Industry Fair, which opened on Monday in Shanghai, a live demonstration showed the robot lifting an entire vehicle. The machine is the CR5000-3700 from Shanghai Chaifu Robotics. According to the company, its rated payload is 5,000.36 kilograms, well above the 2,300-kilogram record it attributes to FANUC.

Payload is the load an arm is rated to carry, and going from 2,300 to 5,000 kilograms is not just a matter of building a bigger arm. Chaifu says the CR5000-3700 has a reach of 3,700 millimetres, and it is aimed at nuclear power, rail transit, large-scale equipment manufacturing and heavy components for the new-energy sector. In these industries, moving a large workpiece usually means cranes or lifting gear, specialised fixtures and manual coordination, which makes automation hard. A robot that can take the weight could take some handling, positioning and assembly work away from people doing hazardous tasks by hand. Heavier loads, however, put more strain on the structure, on joint torque, on motion control and on safety systems.

The design choices reflect that strain. Chaifu cites a self-developed large RV (Rotary Vector) reducer, the gearbox inside a robot joint that lowers rotational speed and transmits torque, a three-motor drive for a single axis, and a cast-steel body. The company also says it develops and makes its own RV reducers, servo motors and controllers. In-house production can give more control over design and upgrades, but in-house does not mean better by default: component performance, mass production, long-term reliability and total cost still have to be proven on factory floors.

Chaifu's control system is the second part of the pitch. According to the company, its range runs from 7-kilogram desktop robots to heavy-duty models handling up to 6,000 kilograms, with support for EtherCAT, a real-time industrial communication protocol, PLC logic control, and welding functions such as seam and arc tracking. One platform across all sizes could cut duplicated development and maintenance work, but that benefit depends on compatibility between models and on how quickly a robot can be commissioned on a real line.

So what changes, concretely? For a plant manager, the question is not the number on the spec sheet but whether the robot can run for months, hit process tolerances and free workers from hazardous lifts at an acceptable return on investment. Those answers will come from long-term use, not from the fair floor. No deployment date, price or named customer appears in the reporting, so for now the 5-ton claim is a credible marker of where Chinese heavy-duty robotics is aiming, not yet proof of what a factory will gain.