An electric motor contains a lot of copper wire. For the production of electric motors, the copper wire is supplied in so-called coil containers from which the wire is then unwound. Inside the coil containers is the so-called winding material. This is a coiled metallic wire, made of copper in electric motor construction. The dimensions of the coil container depend on the thickness and length of the copper wire. Coil containers are made of plastic and are fitted with a polyamide rope at the top for handling. However, handling the spool containers using this rope proves to be problematic as the containers can weigh between 50 kg (110 lbs) and 150 kg (330 lbs). In addition, the rope runs over sharp edges on the container itself (definition of “sharp edge”. Copper wire suppliers deliver the spool containers standing next to each other on pallets. From there, each spool container must be transported to the respective workstation. Handling the containers by hand with the aid of the rope is not possible due to the high dead weight. As a result, they are often attached via an existing crane and hooked directly onto the polyamide rope. This poses an enormous safety risk as these ropes are not approved for hoist operation and the entire container cannot be seen as a lifting device.
A customer had an accident at work while handling spool containers. The container was attached to the existing polyamide rope with a sling. Due to the sharp edges and porosity of the rope, it broke during the lifting process and the container hit the floor. The customer then contacted the Carl Stahl expert consultant. After an intensive assessment of the customer's workplace, the solution was a special gripper. This special gripper grips under the spool container and thus ensures safe handling. The gripping process is safe without damaging the spool container. The special gripper is a so-called scissor gripper. The central suspension eye at the top of the grab can be easily connected to the safety hook of the crane or lifting slings. Numerous handles at the top and sides allow the user to maneuver the grab safely during the load lifting process. Dip-coated counterweights are fitted to the sides of the upper construction to ensure optimum closing of the grab. The weights are also coated with plastic for improved protection against injury.
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The scissor grab in the current customer case has a load capacity of 200 kg (441 lbs), with a dead weight of approx. 40 kg (88 lbs). The crane hook is lowered directly above the spool container using the crane button. The safety hook of the crane or a sling is hooked into the suspension eye with a diameter of 60 mm (2.36 in). A shaped attachment device, which is located on both sides of the arms, sits on top of the bobbin container. The two gripper arms are fitted with brackets at the lower end, which grip into the bead at the bottom of the bobbin container. Thanks to an integrated indexing mechanism, the gripper opens and closes automatically.
In the current customer case, spool containers with a diameter of 470 mm (18.5 in) and a height of 760 mm (29.9 in) can be gripped with this scissor gripper. The indexing mechanism also counts the number of load changes (16,000 load changes in accordance with the standard).
Unfortunately not. The scissor gripper shown in the photo is not adjustable and is therefore only designed for one type of bobbin container. However, an adjustable version would be conceivable. However, this would be reflected in the price.
Theoretically, yes. However, this scissor grab is a special load handling attachment that has been specially developed for use with coil containers. Therefore, no loads other than these coil containers should be lifted with this scissor lift.
Carl Stahl has been manufacturing high-quality special load handling attachments at 4 locations in Germany for decades. Certified welders and a consistent quality process ensure consistently high quality. The Carl Stahl export consultants will be happy to visit you on site and advise you.
As a rule, other load handling attachments are already in use in companies, which is why the user should not be new to handling these load handling attachments. However, Carl Stahl is happy to offer free instruction as part of its services.
