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Standard crane pulley blocks

Standard pulley blocks (here it concerns the bottom blocks) represent the basic and the most used non-detachable suspension means by cranes or lifting equipment.

With regard to the specific handling process we offer the bottom blocks of lifting capacity from several kilograms up to hundreds of tons, of various engineering design and technical equipment. Usually bottom blocks of lower lifting capacities can be designed fully without sheaves, i.e. the bottom block is suspended directly at the end of one supporting rope. Of course, bottom blocks are commonly fitted with sheaves, which form a part of the supporting crane rope pulley block or lifting  equipment. Number of sheaves is various (minimum one) and in principle it is possible to say, that their number increases with the increasing bottom block lifting capacity.

Bottom block with four sheaves   Bottom block with two sheaves   Bottom block with one sheave
Bottom block
with four sheaves
  Bottom block
with two sheaves
  Bottom block
with one sheave

The supporting components of bottom block are usually forged hooks, which can be either single or double, while double hooks can be designed even with opening for hanger pin. At the bottom blocks of very high lifting capacities it is possible to use multi hooks, eventually suspension shackle instead of hook. All hooks are always fitted with protection against self-releasing of handled load. The hooks are coupled with swinging cross bar by means of nut, mounted nearly specifically on the thrust cylindrical roller bearing, which facilitates swivelling of suspension load. In case when it is necessary during some handling activities to prevent the slewing of load, the bottom block can be equipped with locking system, which enables to lock the hook swivelling in positions, determined in advance.

Samples of our standard crane pulley blocks
Crane pulley block 50t Crane pulley block 36t Crane pulley block 20t
Crane pulley block 50t Crane pulley block 36t Crane pulley block 20t

From the point of view of structure, the bottom blocks can be designed as common, standard or with shortened building height. All rope sheaves are always fitted with covers, that serve either as protection against rope slipping out from sheave groove during its releasing, or as protection against falling of foreign object to the space of sheaves, drawing-in of human body part, etc. The bottom blocks can be also fitted with weighing system of various design and accuracy of weighing. The detected mass of load can be shown on display directly on bottom block, transmitted on crane eventually even outside of it, or the combination of these methods can be used.

Bottom block 8t
Bottom block 8t

In case if electromagnet or hydraulic grab are suspended on bottom block, then this block is fitted with socket for power supply and control of these devices. The supply voltage and control signals are lead to bottom block from trolley by cable.

 

Dimensions and properties of products can be fully adapted to the customer's needs. Please do not hesitate to contact us.

KRALOVO POLE CRANES, a.s.
Brigadnicka 69, Brno, 621 00
Czech Republic
Reg. No.
:
46357408
Tax No.
:
CZ46357408
Phone
:
+420 - 602 757 422
Fax
:
-
Email
:
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