"Hehe! Iron Egg, do you still need to ask? Look at Brother Green Sparrow's expression. He must have failed! I told you that without my brother's help, he wouldn't have succeeded! "
Lan 'er pointed at Li Tai and giggled.
Don't expose someone's shortcomings. Lan-er's words could be said to be ruthless, directly stabbing into Li Tai's heart. The little fatty's face darkened, and he almost vomited a mouthful of blood.
Li Zexuan was afraid that he would be too embarrassed, so he said to Lan 'er, "Alright, alright! Lan 'er, go and have fun! I'll come and find you when I'm done! "
After that, he took the pen and paper from Li Tai's hands and walked to the desk at the side and sat down.
Lan 'er saw this and understood that Li Zexuan was going to be busy with business, and it was all business that she was not interested in. Hence, she replied with an "Oh" and went out.
Li Tai heaved a sigh of relief and came over to ask curiously, "Xiao Xuan, what kind of brick moving machine are you going to design? Can it compare to mine? "
Li Zexuan's charcoal pencil paused and he sneered, "Haha! You still have the nerve to compare your broken toy with mine ~? You can just watch from the side! "
After that, he was too lazy to talk nonsense and began to concentrate on drawing.
Speaking of the crane, it was necessary to talk about the pulley block on the crane. Other than the hydraulic transmission mechanism, the most important part of the crane was the pulley block. The fixed pulley block was a fixed fulcrum and prevented the rope from being messed up. The moving pulley block was mainly used to save effort. As long as the design of the pulley block was reasonable, it was not unusual for a person to pull up a 500kg heavy object!
"Let's make a simple crane first!"
Li Zexuan instantly had an idea. The crane's base, connecting rod, pulley block, lifting mechanism, and luffing mechanism all appeared in his mind. These components, under Li Zexuan's pen, quickly formed a beggar's crane with wheels.
There was no other way. Although Li Zexuan could draw a 3D model of the modern large-scale cranes, almost all of them were hydraulic cranes. Even if he could draw one, it could not be done with the industrial level of this era. Hence, after thinking about it, he could only make a human-powered crane with pulley blocks as the core.
"You're done?"
Li Tai saw that Li Zexuan had stopped and could not help but ask.
Li Zexuan nodded and said, "Yes!"
Li Tai furrowed his brows and picked up the drawing. After looking at it for a long time, a trace of surprise appeared on his face. He praised, "This little wheel's design is good ~! With this thing, the hemp rope will suffer much less wear and tear in the future! I don't have to worry about the rope breaking anymore! "
Li Zexuan said with a faint smile, "Oh! Not bad! Qingque, it's not easy for you to see this! But you only know one part of it and not the other! Iron Egg, come and take a look. What's the use of the Wheel on the side of the connecting rod? "
"Yes, Master!"
Iron Egg walked over and began to look at the drawing seriously. After a while, he hesitated and said, "Master! In addition to the Wheel at the top of the connecting rod, there's probably something else that's connected to the bottom! "
Li Zexuan looked at Iron Egg with appreciation and said with a smile, "Not bad, not bad! Iron Egg, you're very accurate. Do you know what's the mystery of this Wheel? "
Iron Egg said embarrassedly, "Sorry, Master! I can't see it! "
Li Tai muttered, "It's just a broken wheel! What mystery can there be ~? "
Li Zexuan was too lazy to bicker with Little Fatty. He pointed to the drawing and explained to them,
"Iron Egg! Qingque! I call this small wheel a pulley ~! The top is called Fixed Pulley. You can all guess its function. It's used to fix the fulcrum, prevent the rope from messing up, and reduce the wear and tear of the rope. The bottom pulley is called Moving Pulley. It's very useful. It can save half of the strength ~! "
Iron Egg and Li Tai were shocked and said in disbelief, "Save half of the strength ~? How is that possible ~? "
Li Zexuan smiled indifferently and said, "How is it not possible ~? When using Moving Pulley, the hook weight is suspended by two pieces of rope. Each piece of rope only bears half of the weight of the hook weight. This way, the person pulling the rope only needs half of the strength to pull it ~! In the future, when you learn another course — physics, you will know a theorem that the power multiplied by the Moving Arm is equal to the resistance multiplied by the Moving Arm.
The Moving Pulley's Moving Arm is twice as long as the Moving Arm, so the power is half of the resistance ~! At that time, you can use this theorem to analyze and you will find that the Moving Pulley is indeed labor-saving in principle. "
Although Li Zexuan's words contained many technical terms that Li Tai had never heard of before, Little Fatty still felt that Li Zexuan's words were very reasonable. He pinched his chin and fell into deep thought.
Iron Egg nodded confusedly and asked doubtfully, "Master, if it's really like what you said, then if we use more Moving Pulleys, won't we be able to lift thousands of pounds of heavy objects with very little strength ~?"
Li Zexuan nodded approvingly and said with a smile, "Iron Egg, your question is very good. That's right. In theory, it is indeed like this. Do you remember what I told you before ~? When engineering is developed to the extreme, ordinary people can lift thousands of pounds of boulders. Master didn't lie to you ~! "
Li Tai's eyes widened and he was shocked speechless. What Li Zexuan said was tantamount to a fantasy to him. It was not an exaggeration to say that it was the means of immortals.
Iron Egg nodded excitedly and said, "Yes, yes! Master, I remember ~! I didn't expect to see such a wonderful scene so soon ~! "
Li Zexuan smiled and shook his head, "But although in theory, the more Moving Pulleys, the more labor-saving it is, it involves the question of whether it is worth it ~!"
"What's not worth it ~?"
Iron Egg asked in puzzlement.
Li Zexuan said with a smile, "Although using a moving pulley saves energy, the distance it moves is twice as far as the distance it moves the hook. That is, it consumes a lot of distance, and that brings up the issue of efficiency.
For example, using a wooden stick to pry open an ant and using a wooden stick to pry open an elephant. Do you think the wooden stick is labor-saving or labor-intensive ~? It's the same with Pulleys. If you use Pulleys that can lift thousands of pounds of boulders to lift a basket of bricks, the Pulleys will probably be heavier than the bricks. It's definitely not worth it ~!
So when deciding the number of Pulleys, you must consider the actual situation. The size of the horse should match the size of the saddle. Don't do more useless work ~! "
There were not many technical terms in these words, so it was not difficult to understand. Iron Egg and Li Tai both seemed to understand something after listening and fell into deep thought.
"Iron Egg understands. Thank you for your teachings ~!"
After a long time, Iron Egg came back to his senses and solemnly clasped his hands.
Li Tai also came back to his senses. He said seriously, "After listening to Master's words, Tai has also benefited a lot. Thank you very much ~!"
At this time, he realized that Li Zexuan was right. The brick moving machine he made was indeed a piece of junk ~!
…
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