I think safety must be a primary consideration of the mold designer, how can a mold, or any heavy mold part, handled safely? No person should repeatedly lift parts heavier than 20kg or any part which is awkward to handle, regardless of weight, without some mechanical assistance, such as a hoist.
Not only should nobody get hurt when handling a mold or mold part, but the mold maker has a legal responsibility for any accident that may arise because of an omission or poor design. Where it is not possible to provide a suitable safety feature, at least a clearly visible warning label or name plate must be provided to inform of the possible hazard and it’s consequences.
The proper solution is the use of lifting points that allow for swiveling of the eye and maintaining full engagement of the bolt in the tool. These lifting points adjust to the direction of the load—allowing for a safe lift. They also use the body of the lifting point as well as the threaded bolt or stud to support the weight of the load.
There are numerous products on the market designed for safe lifting at angles from 0 to 90 degrees, and the swivel hoist ring is best known. It is available in a variety of sizes, styles and prices.
A hoist ring requires its threaded fastener to be torqued to a specified rating to maintain its rated capacity. Its body swivels while the bolt remains stationary. Also its eye can pivot, usually up to 90 degrees. This is important for certain types of lifts.
A more recent style of lifting point is the true swiveling eyebolt, which allows the bolt to be threaded into the tool while independently allowing its eye to swivel a full 360 degrees. This type of lifting point is available in a variety of sizes and is economically priced between a forged eyebolt and a swiveling hoist ring. A swivel eyebolt does not pivot, but for many applications this is not an issue.
When a mold or die must be flipped, the center pull swiveling hoist ring and related lifting points are the correct tools. When a heavy tool is flipped, two lifting points are used on one side of the tool. As the load reaches its balance point and starts to fall onto its side, the lifting points need to both swivel and pivot at the same time, and the entire rigging unit (chains, wire rope, nylon sling, hooks and related hardware) must be properly designed and applied by the crane operator. Any binding of the lifting point could be catastrophic at this moment.
Properly torqued safety hoist rings work well here. The typical hoist ring uses a body, bushing and graphite-based lubricant to allow it to swivel, and an integrated oval or round eye to allow for pivoting. Another lifting point design uses ball bearings in the body to allow for swiveling and an integrated eye to allow for pivoting. The smoothness of the ball bearings makes this product perfect for this application. The ball bearing design does not require the lifting point to be torqued to a specified value. It only needs to be tightened by a wrench flush to the surface of the tool being lifted.
The side pull style hoist ring also is well suited to 90-degree lifts and for the flipping of molds and dies (due to its swiveling and pivoting capabilities). This design offsets the mounting bolt 90 degrees from the lifting eye making for convenient side mounting to the tool.
Clearly a well designed rigging system for safe lifting and moving of molds and dies requires the utmost care in design and application, and the use of the correct threaded lifting point is the final piece of this system.
The lifting and lashing equipment that helps guarantee ultimate safety when lifting and handling heavy loads.
The demand for loads to swivel and pivot safely during the handling process of a project is essential. Loads can easily be damaged and lifting systems can be considerably overloaded. Mould and die manufacturers are prime examples of this, when moulds or dies need to be flipped and handled the lifting points they use need to swivel and pivot at the same time.
The direction of the pull when undertaking heavy lifts that need to swivel and rotate can have a major impact on the working load limit of the standard eyebolt, which can create a safety breach. the lifting equipment is often used for the handling of heavy plant and injection moulding tools due to the fact that a selection of their lifting points can safely lift, swivel and pivot items under full loads.
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