Imagine grabbing a lifting hook and guiding it into position by simply pulling it, with the crane and trolley following smoothly after you. With our Rope Angle Features, you can, and they also provide handy solutions for other everyday lifting challenges—from snags to load swing.
When installed on a crane, an inclinometer—also known as a tilt sensor—measures the angle of slope or tilt of an object with respect to gravity. This instrument makes it possible to prevent snags, enables a hoist to lift a load straight up, and reduces and controls load sway. The inclinometer is at the heart of the Rope Angle Features, part of our Smart Features, and are available as a bundle:
- Hook Centering, which greatly reduces side pull during lifting by positioning the bridge and trolley directly over the load.
- Snag Prevention, which stops all crane movement if the hook, sling or load is detected to be caught on an object.
- Follow Me, which allows the crane to be moved above the load by simply guiding the hook by hand.
In addition, the inclinometer makes the following Smart Features possible for certain cranes:
- Active Sway Control, which manages the bridge and trolley’s acceleration and deceleration and limits load swing to a minimum.
- Assisted Load Turning, which is based on continual measurement of the rope angle, resulting in much simpler and less risky load turning on the ground by using one hoist.
Features make it easier to manage load sway and side pulls
“In the past when there were no technical solutions available for these problems, side pulling had to be minimized manually by the operator.” says Tuomas Rekola, Product Manager at Konecranes. “After working with the Rope Angle Features, it’s now easier to manage load sway or dangerous side pulls.”
While the core idea, measuring the rope angle, might sound simple, a lot of work was needed before a practical solution suitable to customers’ needs was ready.
Ari Lehtinen, Manager of Automation at Konecranes, describes the process, "besides measuring the angle, these features have to constantly analyze the user’s commands to activate the correct one for the situation. Is the rope angle too wide because the load is off-center, which can then be resolved with Hook Centering? Or does the user wish the crane to follow them to another position?”
After experimenting with the new components, Konecranes engineers had to come up with ways to make the Rope Angle Features work on the shop floor, simplifying workflow instead of giving the operator more procedures to follow. Only after thorough investigation was the product ready to be tested in a real environment, where its usability underwent a true trial.
Technology for new or existing cranes
The engineers also had to see to it that these advanced technologies could be installed on both new and existing cranes. While the Hook Centering, Snag Prevention and Follow Me features are available as a separate add-on package for standard cranes, Active Sway Control and Assisted Load Turning are typically utilized in PLC-controlled “Smart” cranes.
“All these features are based on measuring how much the hook has moved in comparison to the trolley. The challenges come with setting the sensors up, calibrating them, and handling special situations. Everything must be thoroughly documented to make certain that the sensors and features are working properly,” adds Lehtinen.
These Smart Features might sound futuristic, but they are already in use, helping operators work more efficiently, enabling faster load cycle times and safer operations, and protecting loads from snags and sway.
“Our customers have been really enthusiastic about being able to solve these universal lifting challenges with this simple, easily installed application,” concludes Rekola.
Text: Pauliina Männistö
Learn more about the newest crane in our offering: the Konecranes X-series rope hoist crane with Rope Angle Features, smooth stepless lifting and a radio with display.