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　　Paintings about Pullwheels appeared in an Assyrian relief from the eighth century BC. This relief shows a very simple pulley that can only change the direction of force application. The main purpose is to facilitate force application and will not give any mechanical benefits. In China, the drawing of pulley devices appeared in the Han Dynasty's portrait bricks and pottery well models. There are also discussions about pulleys in the "Mo Jing".

　　The ancient Greeks classified pulleys as simple machinery. As early as 400 BC, the ancient Greeks knew how to use duplex pulleys. Around 330 BC, Aristodd's eighteenth question in his book "Mechanical Problems" specifically discussed the "complex pulley" system Archimedes contributed a lot of knowledge about simple machinery and explained the kinematic theory of pulleys in detail. It is said that Archimedes once used a duplex pulley to pull a sea ship full of cargo and passengers alone. In the first century AD, Alexander's Hero analyzed and wrote a theory about duplex pulleys, proving that the ratio of load to force is equal to the number of rope segments that bear the load, that is, the "pulley principle".

　　In 1608, in the book "Mathematical Collection", Dutch physicist Simon Steffen showed that the length ratio of the movement path between the force applied to the load of the pulley system is equal to the inverse ratio between the force applied to the load. This is the prototype of the virtual work principle.

　　In 1788, French physicist Joseph Lagrangian used the principle of pulley to deduce the principle of virtual work in his masterpiece "Mécanique analytique", thus opening the prelude to Lagrangian mechanics.

　　Our company's main business: hook hook group Welcome to visit and purchase!

　　Paintings about Pullwheels appeared in an Assyrian relief from the eighth century BC. This relief shows a very simple pulley that can only change the direction of force application. The main purpose is to facilitate force application and will not give any mechanical benefits. In China, the drawing of pulley devices appeared in the Han Dynasty's portrait bricks and pottery well models. There are also discussions about pulleys in the "Mo Jing".

　　The ancient Greeks classified pulleys as simple machinery. As early as 400 BC, the ancient Greeks knew how to use duplex pulleys. Around 330 BC, Aristodd's eighteenth question in his book "Mechanical Problems" specifically discussed the "complex pulley" system Archimedes contributed a lot of knowledge about simple machinery and explained the kinematic theory of pulleys in detail. It is said that Archimedes once used a duplex pulley to pull a sea ship full of cargo and passengers alone. In the first century AD, Alexander's Hero analyzed and wrote a theory about duplex pulleys, proving that the ratio of load to force is equal to the number of rope segments that bear the load, that is, the "pulley principle".

　　In 1608, in the book "Mathematical Collection", Dutch physicist Simon Steffen showed that the length ratio of the movement path between the force applied to the load of the pulley system is equal to the inverse ratio between the force applied to the load. This is the prototype of the virtual work principle.

　　In 1788, French physicist Joseph Lagrangian used the principle of pulley to deduce the principle of virtual work in his masterpiece "Mécanique analytique", thus opening the prelude to Lagrangian mechanics.

　　Our company's main business: hook hook group Welcome to visit and purchase!