The pulley block is a crane equipment composed of several fixed pulleys and movable pulleys wound by galvanized steel wire rope. It has the advantages of fixed pulley and movable pulley, which can save strength and change the compression direction of galvanized steel wire rope. The following Guangdong lifting equipment rental section will introduce the relevant application knowledge of pulley block for you:

(1) classification of pulley block

The pulley block can be divided into single pulley block and double connected pulley block according to its structure, and can be divided into energy saving pulley block and growth speed pulley block according to its functional characteristics. The hoisting organization of the crane adopts single link and energy saving pulley block. One end of the galvanized steel wire rope is fixed at the end of the lifting hook or lifting arm beam, and the other end is wound from the pulley block. According to the guiding movable pulley, it is wound on the wire rope drum.

The application of the economizer pulley block, the energy saving level, the total number of movable pulleys and the galvanized steel wire rope threading shall be considered

It depends on the method. For the single pulley block, the energy saving level lies in the multiple of the pulley block, the multiple is 2, and the saving force is half (without considering the friction resistance of the moving pulley); when the multiple is 4, only 1 / 4 of the load is required.

(2) threading and winding of galvanized steel wire rope for pulley block

When the galvanized steel wire rope is wound on the pulley block, it should be wound in a certain order. The winding methods include forward winding, reverse winding, 2 rope winding and 4 rope winding.

The hoisting pulley block galvanized steel wire rope at the crane shall be wound in sequence. From the pulley block; 11 wire rope head is called walking head or running head. In hoisting, it is indicated that the structure of pulley block is commonly used in terms of one two four, two two four, one one two, and their meanings are respectively expressed as follows: a pulley block consisting of one fixed pulley and two moving pulleys with four downflow ropes; a pulley block composed of two fixed pulleys and two movable pulleys with four Ding ropes; one with two fixed pulleys and two movable pulleys with four ropes; A pulley block consisting of a fixed pulley and a movable pulley with two Ding ropes. Cranes with small lifting weight usually use pulley blocks of four or two-one-three; cranes with heavy lifting mostly use two-two-way-four pulley blocks.

(3) key points of application of movable pulley and pulley block

(1) before application, check the allowable load of the movable pulley or pulley block, check whether there is any gap damage in the groove, shaft tenon, straight hair splint, lifting hook (or eyebolt) of the movable pulley, and whether the rotation of the movable pulley is convenient. It can be applied if it is good.

(2) after the pulley block is put in, the force shall be increased slowly. After the rope is tightened, check whether each part is in good condition and whether there is any place for rope sticking. If there is any improper place, it can be applied after adjustment.

(3) the core of the lifting hook (or eyebolt) of the movable pulley should be on a plumb line with the point where the prefabricated component is lifted to prevent instability after hoisting. The distance between the left and right moving pulleys of the pulley block shall be determined according to the actual situation, generally 700? 1200 mm.

(4) before and after application, the movable pulley should be cleaned and cleaned, and the shaft tenon should be oiled to make it rotate easily and reduce damage and induced corrosion.

Article source: Guangdong lifting equipment rental http://www.jmzhongte.com