Introduction to the relevant knowledge of crane pulley block
pulley set is a crane equipment composed of galvanized steel wire ropes that penetrate several fixed pulleys and moving pulleys. It has the advantages of both fixed and moving pulleys, and can save effort and change the compression orientation of the galvanized steel wire rope.
Introduction to related knowledge of crane pulley sets
(1) Classification of pulley sets
The pulley sets can be divided into single pulley sets and double pulley sets according to their structural method; according to their functional characteristics, they can be divided into force-saving pulley sets and growth speed pulley sets. The lifting structure of the crane is made of single-coupled and power-saving pulley sets. One end of the galvanized steel wire rope is fixed at the end of the lifting hook or lifting boom, and the other end is wound out from the pulley set. According to the guiding moving pulley, it is wound on the wire rope reel.
A force-saving pulley set is used, and its force-saving level depends on the total number of moving pulleys and the method of winding the galvanized wire rope. For single-link pulley sets, the power saving level lies in the multiple of the pulley set. The multiple is 2, which saves half of the power saving (not taking into account the friction resistance of the moving pulley); the multiple is 4, and only 1/4 of the load must be loaded.
(2) Winding of galvanized steel wire ropes for pulley sets
When winding galvanized steel wire ropes on pulley sets, they should be wound in a certain order. The winding methods include forward winding, reverse winding, 2 rope winding, and 4 rope winding.
The galvanized steel wire rope for lifting pulley set at the crane is selected by winding the winding method. The wire rope head that comes from the pulley set is called a walking head or a running head. In lifting and hoisting, the structure of the pulley set is often used in terms of one, two, two, two, four, one, one, two, and two, and their meanings are expressed separately: a pulley set with 4 downflow ropes composed of one fixed pulley and two moving pulleys; a pulley set with 4 D-ropes composed of two fixed pulleys and two moving pulleys; a pulley set with 2 D-ropes composed of one fixed pulley and one moving pulley. Cranes with small weights mostly use pulley sets with one-way four or two-way three; cranes with heavy weights mostly use pulley sets with two-way four.
(3) High efficiency of pulley set
When galvanized steel wire rope avoids moving pulley fitness exercise, it is necessary to get rid of the rigid friction resistance of the galvanized steel wire rope and also to get rid of the friction resistance of the moving pulley bearing. Therefore, the loss of output power and the size of the loss are expressed by the high efficiency of the moving pulley. The high efficiency of the pulley set is related to the number of ropes of the pulley set. The larger the number of ropes, the greater the friction resistance, and the lower the high efficiency of the pulley set.
(4) Key points of application of moving pulleys and pulley sets
① Before application, check the allowable load of moving pulleys or pulley sets, check whether there are gap damages in each part of the moving pulley, shaft tenon, hair straightening plate, lifting hook (or ring screw) and other parts of the moving pulley, and whether the rotation of the moving pulley is flexible. If you are sure to be excellent, you can apply it.
②After the pulley set is worn, the force should be increased slowly. After the rope is tightened, check whether each part is good and whether there are any places where the rope is stuck. If there is any inappropriate point, it should be adjusted before it can be applied.
③ The core of the lifting hook (or ring screw) of the moving pulley should be on the same plumb line as the center of gravity of the lifting prefabricated components to prevent unstable components after being lifted. The less spacing between the left and right moving pulleys of the pulley set should be determined according to the actual situation, generally 700?1 200 mm.
④ The moving pulley must be cleaned and clean before, after, left and right of application, and the shaft and tenon must be oiled to make it rotate lightly and reduce damage and corrosion.
pulley set is a crane equipment composed of galvanized steel wire ropes that penetrate several fixed pulleys and moving pulleys. It has the advantages of both fixed and moving pulleys, and can save effort and change the compression orientation of the galvanized steel wire rope.
Introduction to related knowledge of crane pulley sets
(1) Classification of pulley sets
The pulley sets can be divided into single pulley sets and double pulley sets according to their structural method; according to their functional characteristics, they can be divided into force-saving pulley sets and growth speed pulley sets. The lifting structure of the crane is made of single-coupled and power-saving pulley sets. One end of the galvanized steel wire rope is fixed at the end of the lifting hook or lifting boom, and the other end is wound out from the pulley set. According to the guiding moving pulley, it is wound on the wire rope reel.
A force-saving pulley set is used, and its force-saving level depends on the total number of moving pulleys and the method of winding the galvanized wire rope. For single-link pulley sets, the power saving level lies in the multiple of the pulley set. The multiple is 2, which saves half of the power saving (not taking into account the friction resistance of the moving pulley); the multiple is 4, and only 1/4 of the load must be loaded.
(2) Winding of galvanized steel wire ropes for pulley sets
When winding galvanized steel wire ropes on pulley sets, they should be wound in a certain order. The winding methods include forward winding, reverse winding, 2 rope winding, and 4 rope winding.
The galvanized steel wire rope for lifting pulley set at the crane is selected by winding the winding method. The wire rope head that comes from the pulley set is called a walking head or a running head. In lifting and hoisting, the structure of the pulley set is often used in terms of one, two, two, two, four, one, one, two, and two, and their meanings are expressed separately: a pulley set with 4 downflow ropes composed of one fixed pulley and two moving pulleys; a pulley set with 4 D-ropes composed of two fixed pulleys and two moving pulleys; a pulley set with 2 D-ropes composed of one fixed pulley and one moving pulley. Cranes with small weights mostly use pulley sets with one-way four or two-way three; cranes with heavy weights mostly use pulley sets with two-way four.
(3) High efficiency of pulley set
When galvanized steel wire rope avoids moving pulley fitness exercise, it is necessary to get rid of the rigid friction resistance of the galvanized steel wire rope and also to get rid of the friction resistance of the moving pulley bearing. Therefore, the loss of output power and the size of the loss are expressed by the high efficiency of the moving pulley. The high efficiency of the pulley set is related to the number of ropes of the pulley set. The larger the number of ropes, the greater the friction resistance, and the lower the high efficiency of the pulley set.
(4) Key points of application of moving pulleys and pulley sets
① Before application, check the allowable load of moving pulleys or pulley sets, check whether there are gap damages in each part of the moving pulley, shaft tenon, hair straightening plate, lifting hook (or ring screw) and other parts of the moving pulley, and whether the rotation of the moving pulley is flexible. If you are sure to be excellent, you can apply it.
②After the pulley set is worn, the force should be increased slowly. After the rope is tightened, check whether each part is good and whether there are any places where the rope is stuck. If there is any inappropriate point, it should be adjusted before it can be applied.
③ The core of the lifting hook (or ring screw) of the moving pulley should be on the same plumb line as the center of gravity of the lifting prefabricated components to prevent unstable components after being lifted. The less spacing between the left and right moving pulleys of the pulley set should be determined according to the actual situation, generally 700?1 200 mm.
④ The moving pulley must be cleaned and clean before, after, left and right of application, and the shaft and tenon must be oiled to make it rotate lightly and reduce damage and corrosion.
pulley set is a crane equipment composed of galvanized steel wire ropes that penetrate several fixed pulleys and moving pulleys. It has the advantages of both fixed and moving pulleys, and can save effort and change the compression orientation of the galvanized steel wire rope.
Introduction to related knowledge of crane pulley sets
(1) Classification of pulley sets
The pulley sets can be divided into single pulley sets and double pulley sets according to their structural method; according to their functional characteristics, they can be divided into force-saving pulley sets and growth speed pulley sets. The lifting structure of the crane is made of single-coupled and power-saving pulley sets. One end of the galvanized steel wire rope is fixed at the end of the lifting hook or lifting boom, and the other end is wound out from the pulley set. According to the guiding moving pulley, it is wound on the wire rope reel.
A force-saving pulley set is used, and its force-saving level depends on the total number of moving pulleys and the method of winding the galvanized wire rope. For single-link pulley sets, the power saving level lies in the multiple of the pulley set. The multiple is 2, which saves half of the power saving (not taking into account the friction resistance of the moving pulley); the multiple is 4, and only 1/4 of the load must be loaded.
(2) Winding of galvanized steel wire ropes for pulley sets
When winding galvanized steel wire ropes on pulley sets, they should be wound in a certain order. The winding methods include forward winding, reverse winding, 2 rope winding, and 4 rope winding.
The galvanized steel wire rope for lifting pulley set at the crane is selected by winding the winding method. The wire rope head that comes from the pulley set is called a walking head or a running head. In lifting and hoisting, the structure of the pulley set is often used in terms of one, two, two, two, four, one, one, two, and two, and their meanings are expressed separately: a pulley set with 4 downflow ropes composed of one fixed pulley and two moving pulleys; a pulley set with 4 D-ropes composed of two fixed pulleys and two moving pulleys; a pulley set with 2 D-ropes composed of one fixed pulley and one moving pulley. Cranes with small weights mostly use pulley sets with one-way four or two-way three; cranes with heavy weights mostly use pulley sets with two-way four.
(3) High efficiency of pulley set
When galvanized steel wire rope avoids moving pulley fitness exercise, it is necessary to get rid of the rigid friction resistance of the galvanized steel wire rope and also to get rid of the friction resistance of the moving pulley bearing. Therefore, the loss of output power and the size of the loss are expressed by the high efficiency of the moving pulley. The high efficiency of the pulley set is related to the number of ropes of the pulley set. The larger the number of ropes, the greater the friction resistance, and the lower the high efficiency of the pulley set.
(4) Key points of application of moving pulleys and pulley sets
① Before application, check the allowable load of moving pulleys or pulley sets, check whether there are gap damages in each part of the moving pulley, shaft tenon, hair straightening plate, lifting hook (or ring screw) and other parts of the moving pulley, and whether the rotation of the moving pulley is flexible. If you are sure to be excellent, you can apply it.
②After the pulley set is worn, the force should be increased slowly. After the rope is tightened, check whether each part is good and whether there are any places where the rope is stuck. If there is any inappropriate point, it should be adjusted before it can be applied.
③ The core of the lifting hook (or ring screw) of the moving pulley should be on the same plumb line as the center of gravity of the lifting prefabricated components to prevent unstable components after being lifted. The less spacing between the left and right moving pulleys of the pulley set should be determined according to the actual situation, generally 700?1 200 mm.
④ The moving pulley must be cleaned and clean before, after, left and right of application, and the shaft and tenon must be oiled to make it rotate lightly and reduce damage and corrosion.
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