What does the mechanical efficiency of a pulley block relate to? What is the calculation formula?
The pulley set is a machine composed of a fixed pulley and a moving pulley. Its function is to change the direction of force and save labor. It is widely used in cranes, hoists, elevators and other machinery. The mechanical efficiency of the pulley set generally refers to the percentage of the output work and the input work. This parameter is related to factors such as the weight of the lifted object, the weight of the pulley, and the friction between the rope and the pulley.
1. What is a pulley set?
Pulley set is a simple machinery assembled by multiple moving pulleys and fixed pulleys. It is a deformation of the lever and belongs to a lever simple machinery. Generally, the name of the pulley set is expressed by the number of fixed pulleys and moving pulleys that make up the pulley set. For example, the pulley set consisting of four fixed pulleys and four moving pulleys is called a four-four pulley set.
2. What is the function of the pulley set?
The pulley set is a combination of fixed pulleys and moving pulleys. Therefore, its function is to combine the fixed pulleys and moving pulleys. That is, it can not only play the role of changing the direction of the force of the fixed pulleys, but also play the role of saving labor in the dynamic pulleys. Using the pulley set to transport or lift goods, although it takes distance, it can play the role of saving labor and is widely used in cranes, hoists, elevators and other machinery.
3. What is the mechanical efficiency of the pulley set related to?
The mechanical efficiency of the pulley set refers to the percentage of the output work (useful work amount) of the machinery and the input work (power work amount) when the pulley set is running stably. This parameter is related to multiple factors:
1. The weight of the lifted object: The greater the weight of the lifted object, the higher the mechanical efficiency.
2. Pullwheel weight: If there are more pulley sets, although it saves effort, it is useless and has less mechanical efficiency.
3. Friction between rope and pulley: The greater the friction, the smaller the mechanical efficiency.
In addition, factors such as winding of the pulley set, the distance at which the object is increased, and the speed of lifting the object do not affect the mechanical efficiency of the pulley set.
IV. Calculation formula for mechanical efficiency of pulley set
Pulley set: useful work (W useful = Gh), extra work (work done by overcoming the weight of the moving pulley, rope weight and friction (W extra = W total - W useful, if the weight of the rope and friction, W extra = G dynamic h), the calculation formula for mechanical efficiency of pulley set is:
Formula 1: η=W useful/W total=Gh/Fs=Gh/Fnh=G/nF (G is the weight of the object, h is the height of the object rising, F is the magnitude of the tension, s is the height of the rope rising, n is the number of strands of the rope).
Formula 2: η=W useful/W total=Gh/Fs=Gh/Fnh=G/nF=(not counting the weight and friction of the rope) G/ (G+G motion).
The pulley set is a machine composed of a fixed pulley and a moving pulley. Its function is to change the direction of force and save labor. It is widely used in cranes, hoists, elevators and other machinery. The mechanical efficiency of the pulley set generally refers to the percentage of the output work and the input work. This parameter is related to factors such as the weight of the lifted object, the weight of the pulley, and the friction between the rope and the pulley.
1. What is a pulley set?
Pulley set is a simple machinery assembled by multiple moving pulleys and fixed pulleys. It is a deformation of the lever and belongs to a lever simple machinery. Generally, the name of the pulley set is expressed by the number of fixed pulleys and moving pulleys that make up the pulley set. For example, the pulley set consisting of four fixed pulleys and four moving pulleys is called a four-four pulley set.
2. What is the function of the pulley set?
The pulley set is a combination of fixed pulleys and moving pulleys. Therefore, its function is to combine the fixed pulleys and moving pulleys. That is, it can not only play the role of changing the direction of the force of the fixed pulleys, but also play the role of saving labor in the dynamic pulleys. Using the pulley set to transport or lift goods, although it takes distance, it can play the role of saving labor and is widely used in cranes, hoists, elevators and other machinery.
3. What is the mechanical efficiency of the pulley set related to?
The mechanical efficiency of the pulley set refers to the percentage of the output work (useful work amount) of the machinery and the input work (power work amount) when the pulley set is running stably. This parameter is related to multiple factors:
1. The weight of the lifted object: The greater the weight of the lifted object, the higher the mechanical efficiency.
2. Pullwheel weight: If there are more pulley sets, although it saves effort, it is useless and has less mechanical efficiency.
3. Friction between rope and pulley: The greater the friction, the smaller the mechanical efficiency.
In addition, factors such as winding of the pulley set, the distance at which the object is increased, and the speed of lifting the object do not affect the mechanical efficiency of the pulley set.
IV. Calculation formula for mechanical efficiency of pulley set
Pulley set: useful work (W useful = Gh), extra work (work done by overcoming the weight of the moving pulley, rope weight and friction (W extra = W total - W useful, if the weight of the rope and friction, W extra = G dynamic h), the calculation formula for mechanical efficiency of pulley set is:
Formula 1: η=W useful/W total=Gh/Fs=Gh/Fnh=G/nF (G is the weight of the object, h is the height of the object rising, F is the magnitude of the tension, s is the height of the rope rising, n is the number of strands of the rope).
Formula 2: η=W useful/W total=Gh/Fs=Gh/Fnh=G/nF=(not counting the weight and friction of the rope) G/ (G+G motion).
The pulley set is a machine composed of a fixed pulley and a moving pulley. Its function is to change the direction of force and save labor. It is widely used in cranes, hoists, elevators and other machinery. The mechanical efficiency of the pulley set generally refers to the percentage of the output work and the input work. This parameter is related to factors such as the weight of the lifted object, the weight of the pulley, and the friction between the rope and the pulley.
1. What is a pulley set?
Pulley set is a simple machinery assembled by multiple moving pulleys and fixed pulleys. It is a deformation of the lever and belongs to a lever simple machinery. Generally, the name of the pulley set is expressed by the number of fixed pulleys and moving pulleys that make up the pulley set. For example, the pulley set consisting of four fixed pulleys and four moving pulleys is called a four-four pulley set.
2. What is the function of the pulley set?
The pulley set is a combination of fixed pulleys and moving pulleys. Therefore, its function is to combine the fixed pulleys and moving pulleys. That is, it can not only play the role of changing the direction of the force of the fixed pulleys, but also play the role of saving labor in the dynamic pulleys. Using the pulley set to transport or lift goods, although it takes distance, it can play the role of saving labor and is widely used in cranes, hoists, elevators and other machinery.
3. What is the mechanical efficiency of the pulley set related to?
The mechanical efficiency of the pulley set refers to the percentage of the output work (useful work amount) of the machinery and the input work (power work amount) when the pulley set is running stably. This parameter is related to multiple factors:
1. The weight of the lifted object: The greater the weight of the lifted object, the higher the mechanical efficiency.
2. Pullwheel weight: If there are more pulley sets, although it saves effort, it is useless and has less mechanical efficiency.
3. Friction between rope and pulley: The greater the friction, the smaller the mechanical efficiency.
In addition, factors such as winding of the pulley set, the distance at which the object is increased, and the speed of lifting the object do not affect the mechanical efficiency of the pulley set.
IV. Calculation formula for mechanical efficiency of pulley set
Pulley set: useful work (W useful = Gh), extra work (work done by overcoming the weight of the moving pulley, rope weight and friction (W extra = W total - W useful, if the weight of the rope and friction, W extra = G dynamic h), the calculation formula for mechanical efficiency of pulley set is:
Formula 1: η=W useful/W total=Gh/Fs=Gh/Fnh=G/nF (G is the weight of the object, h is the height of the object rising, F is the magnitude of the tension, s is the height of the rope rising, n is the number of strands of the rope).
Formula 2: η=W useful/W total=Gh/Fs=Gh/Fnh=G/nF=(not counting the weight and friction of the rope) G/ (G+G motion).
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