КРАНОВЫЕ БЛОКИ - ВВЕДЕНИЕ

General

Standard crane blocks consist of 3 ranges, (1) the single sheave block with non swinging, but swiveling "Alloy" hook, (2) the 1, 3 or 5 sheaves block with dual action (swinging and swiveling) DIN-hook and (3) the 1,2 or 5 sheave fast reeve block with dual action DIN-hook. Standard blocks are supplied with becket. These standard series are shown on the next pages.

Apart from these standard ranges, we can supply crane blocks in any design and size to meet your demands.
Crane blocks are supplied with a test certificate without additional costs.

Inspection, testing and maintenance

• Check daily visually the blocks for damages and dirt.
• Blocks should be inspected at least once a year by a surveyor for proper functioning and damages.
• Blocks should be taken apart at least every 4 years by a specialist, for inspection of wear, hidden damages or beginning cracks and have the blocks tested by an authorized testing body.
• After repair, blocks have to be tested by an authorized testing body.
• If blocks are supplied with grease nipples, preferably grease every 24 hours at continuous use and every fortnight at discontinuous use.

Different grease frequencies apply in the next circumstances:

• bronze bearings: every 8 hours at continuous use or at least after 2 weeks;
• main shaft ball bearings: every 24 hours at continuous use or at least after 2 weeks;
• tapered roller bearings: every 40 hours at continuous use or at least after 4 weeks;
• cylindrical roller bearings: every month at continuous use or once every year in clean operating circumstances.
• Parts should be replaced if wear is 5% or more (e.g. hook, eye and becket).

Directions for use

• For the use of wire rope blocks, the bearing loads should be taken into account (see diagram below).
  
  
  P= Load generated by object to be moved.
  Q= Maximum load allowed on connection during operation.
  T= Forces in cable at load Q.
• If the wire rope end termination (dead end) is to be connected to the block, it should be mounted to the becket only.
• For mounting a crane block, the maximum fleet angle is 2° from the centre of the sheave.
• For connections, only use components (like sockets or shackles) that are suitable for the indicated working load limit (WLL).
• Never use wire rope with a diameter larger than the groove of the sheave is made for. •A hook has to be supplied and used with a safety latch.
• The hook must always support the load. The load must never be supported by the latch.
  
• Never use a hook whose throat opening has been increased or whose tip has been bent more than 10° out of the plane from the hook body or is in any other way distorted or bent. The latch will not work properly on a hook with a bent or worn tip.
• Never repair, alter rework or reshape a hook by welding, heating, burning or bending.
• When placing 2 sling legs in a hook, make sure that the angle between the legs does not exceed 90°.
  

  TOTAL MAX 90°

• Never side load, back load or tip load a hook.
  

Design, specifications

• Standard all crane blocks are supplied with a becket.
• Standard all crane blocks are painted yellow, over 20 tons yellow with black stripes.
• Standard all crane blocks are fitted with cylindrical roller bearings. Other bearings on request.
• Diverging sizes and designs are possible (including duplex or rams horn hooks, safety hooks, cargo hooks, and other numbers of sheaves), see also brochures.