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Load-lifting systemsPrint

Load-lifting systems: useful helpers for heavy work

Do you have to do a lot of lifting in your work? And is it not always possible to do that in a back-friendly way? Then adjust your working environment and use tools that make it easier for you to lift loads. For example, clever load lifting systems that can be put to versatile use.

Avoiding backache

Unfortunately, it must be said that in most cases we get backache after behaving incorrectly. The clearest example is how we lift loads. If you keep your legs stiff and straight when lifting a crate of drinks and bend your back to heave it up, you shouldn’t really be surprised if you end up with lumbago.

Lifting loads like this will squash the intervertebral discs into a wedge shape. If you do this all the time, the intervertebral discs will age prematurely. As a result, the disc core is no longer retained in its correct position, it slips back and exerts painful pressure on the nerve fibres in the spinal cord. The vertebral joints can also be affected, with the risk of them getting wedged together when the muscular corset is too weak.

Those who’ve been to a back school know the rules for lifting loads correctly: stand up close to the load in a frontal position, hold your back straight when bending down and bend your knees to lift the load up in a flowing movement close to the body.

Making clever use of machines

It’s not always easy to implement the apparently simple answer: time pressure, workplace design or also knee problems can make it difficult to lift loads correctly. That’s why it makes sense to have machines that do the heavy work, particularly in view of the fact that many loads are so heavy that they cannot be lifted by most average workers. Modern electric cable hoists and vacuum lifters then prove to be valuable helpers. Among others, they should be suitable for individual use, and it should be possible to adapt them to the specific workplace.

Vacuum lifter/vacuum gripper

Vacuum systems can be used for stacking boxes or bags, loading drums or barrels, laying stone slabs and much more besides. The technical principle is extremely simple: a vacuum is generated between the suction foot of the suction lifter and the item being lifted, so that the air tube is compressed by the negative pressure which makes it possible to move the load. Single prerequisite: as far as possible, the surface must be smooth and impermeable to air. Different suction feet must be provided depending on requirements. An additional rubber sealing skirt can ensure that the vacuum system still works perfectly even when the material is porous.

Vacuum lifters/grippers are available in various designs. They can also be fastened to different suspension systems. Here again it is crucial that the load lifter is not too heavy and has an ergonomic operating handle for both right- and left-handed users. Tools such as hooks, clamping grippers and vacuum tools must be easily changed. Important features include fast vacuum application and release; the load should also turn and swivel easily. Swivelling can be facilitated by a rotary function integrated at the top and bottom of the air tube.

Rope hoists

Rope hoists are another possibility for lifting loads with machinery. They are ideal for moving loads weighing up to 120 kg, regardless whether these are boxes, bags, buckets, slabs, panels, drums and barrels or also pallets. They are extremely variable in use when fastened to swivel cranes or other crane systems. The rope hoist itself should not be heavier than about 22 kg to ensure it is easy to use. An ergonomic operating handle is ideal. This can be a one-hand pistol grip or a joystick, which must be designed for both right- and left-handed users.

Quick-change tools such as hooks or clamping grippers help to ensure easy, fast and economical workflows. A quick-change coupling makes it much easier to change the tool as it eliminates any great workload or tooling requirements. The rope hoist should also be designed for easily accessible lifting, turning and swivelling from above or from the sides at a wide range of different angles with fully variable speed control.

Safety aspects play a major role for both vacuum lifters and rope hoists. For example, the load must not be allowed to fall down immediately if there is a power failure. The system must detect the error and be designed to hold the vacuum until the load can be put down safely for man and machine.

Checklist

  • Load lifting systems must be suitable for a wide range of different materials and forms: sacks, bags, drums, barrels, boxes, slabs and panels, panes of glass, cases, canisters and much more besides.
  • Depending on the various loads, it must be possible to adjust the systems individually to the load being carried. Manufacturers must offer different mounting fixtures and address specific customer requirements.
  • Different loads require different fixtures. This is why quick-change systems make sense with quick, easy change processes as required, needing no tools as far as possible.
  • Loads are usually not transported on the spot but over certain distances. Swivel cranes or crane systems are therefore appropriate.
  • If the items being moved are not particularly large, a one-hand control (for right- and left-handed users) is an advantage.
  • The users operating the system will not always be the same size so that individual adjustment of the suspended height with load must be possible.
  • Generally, swift and safe activation of the vacuum and picking up of the load is just as important as the subsequent release phase.
  • Regardless of the system, it should be possible to lift, turn and swivel from above or from the side at different angles and without requiring too much physical effort. Electrical assistance is an advantage for larger items.
  • With all load lifters in general, and in particular with vacuum systems, it is important to ensure that the load cannot fall down suddenly. It must be warranted that the system will hold the load for a limited time and put it down safely, even if there is a power failure, for example.

Minimum requirements

  • For a wide range of different materials, shapes and weights
  • Ergonomic operating handles
  • Adjustable suspended height, also with load
  • Easy lifting, turning and swivelling of the load
  • Wide radius of movement
  • Easy to use
  • Very safe even if there is a power failurel
  • Additional requirements for vacuum lifters and rope hoists: Light weight
  • Additional requirements for vacuum lifters and rope hoists: One-hand control for right- and left-handed users
  • Additional requirements for vacuum lifters and rope hoists: Quick-change toolse

Products in this sector with the AGR seal of approval

Manufacturer

TAWI GmbH
August-Thyssen-Str. 1
41564 Kaarst
GERMANY
Phone +49 211/20542740
Fax +49 211/20542749
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www.tawi.de