The crane pulley is the load-bearing part of the crane, which can change the working tension in the flexible part or change its movement speed and direction.
It can be used as a guide crane pulley, more to make a crane pulley block.
The crane pulley of the crane has two kinds: the fixed pulley and the movable pulley, and the combination becomes the crane pulley block.
(1) the crown block
The fixed pulley is essentially equal to the arm lever, not saving effort, but can change the force direction.
The characteristics of the fixed pulley: it is not easy to draw the hook code by setting the pulley.
The reading of the spring scale is the same with or without the fixed pulley.
So you can see that using the fixed pulley doesn't save you a lot of effort but you can change the direction of the force.
In many cases, changing direction will bring convenience to work.
The principle of fixed pulley: the fixed pulley is essentially an equal arm lever, the power L1, the resistance L2 arm is equal to the pulley radius.
According to the leverage equilibrium conditions, it can also be concluded that the fixed pulley is not efficient.
The movable pulley is essentially the lever of the power arm, which is twice the lever of the lever, and the province 1/2 power is twice the distance.
The characteristic of movable pulley: using movable pulley can save half force and distance.
This is because the hook code is hung from two pieces of rope when using a movable pulley, and each piece is only half the weight of the hook.
Although the use of movable pulley saves the force, but the distance of the dynamic movement is greater than the distance of the hook code, namely, the distance.
The principle of movable pulley: the movable pulley is essentially a power arm (L1) for the lever of resistance (L2).
(3) block and tackle
crane Pulley block: a pulley block consisting of a fixed pulley and a movable pulley, which can be both labor-saving and changing the direction of the force.
The pulley group USES a few pieces of rope to hang the object, and the force used to lift the object is a fraction of the total weight.
The free end of the rope circumvents the calculation of the pulleys, and it doesn't count.
Although the use of the pulley block, it saves the force, but the distance is greater than the distance that the weight moves.
The purpose of the pulley block: to save and change the direction of power, the fixed pulley and the movable pulley can be combined into the crane pulley block.
The size of the force: when using the crane pulley block, the crane pulley group USES a few pieces of rope to hang the object, and the force used to lift the object is a fraction of the weight.
The characteristics of the crane pulley group: it is easy to see that using the crane pulley block, although the use of the crane pulley block has saved the force, the distance from the dynamic movement is greater than the distance of the cargo
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