Otaku Engineer in Great Tang Dynasty Chapter 557: Human crane~!
"Hey~! Do you still have to ask about the iron egg? Looking at the expression of Brother Qingque, he must have failed~! I said that without the help of my brother, he would definitely not succeed~!"
Lan Er pointed at Li Tai and giggled.
Exposing people without exposing shortcomings, Lan'er's words are not cruel, and they directly hit Li Tai's heart. The little fat man's face turned black and he almost vomited old blood.
Li Zexuan was afraid that he would be too embarrassed, so he said to Lan'er: "Alright~! Lan'er, go and play~! When I'm done, I will find you~!"
After that, he took the pen and paper in Li Tai's hand by the way and walked to the side of the book case and sat down.
When Lan'er saw this, she also understood that Li Zexuan was going to be busy with business matters next, and that they were all business matters that she was not interested in, so he said "Oh" and went out.
Li Tai breathed a sigh of relief and leaned in curiosity: "Xiaoxuan, what kind of brick moving machine are you designing~? Can it compare to mine~?"
Li Zexuan had a meal with the charcoal pen in his hand, and sneered: "Haha~! You are embarrassed to compare your broken stuff with me~? You can watch it carefully~!"
After all, he didn't bother to talk nonsense anymore, and began to sink his mind and draw pictures.
When it comes to cranes, one has to talk about the pulley block on the crane. In addition to the hydraulic transmission mechanism, the most critical component of the crane is the pulley block. The fixed pulley plays the role of a fixed fulcrum to prevent messy ropes, and the movable pulley mainly plays a role of saving energy. As long as the pulley block is designed properly, it is not uncommon for a person to pull a thousand catties of weight~!
"Get a simple crane first~!"
Li Zexuan had an idea instantly. The crane base, connecting rod, pulley block, lifting mechanism, and luffing mechanism came up with three-dimensional models in his mind. These components, in Li Zexuan’s pen, quickly formed a Beggar version crane on wheels.
No way. Although Li Zexuan can draw three-dimensional models of modern hairstyle cranes, almost all of them are hydraulic cranes. He can draw them, and he can't do them with the industrial level of this era. Therefore, after much deliberation, I can only build this kind of human crane based on the pulley block.
"Is this done~?"
Seeing that Li Zexuan had stopped writing, Li Tai couldn't help but approached and asked.
Li Zexuan nodded and said: "Yes~!"
Li Tai frowned and picked up the drawing. After looking at the drawing for a long time, there was a hint of surprise on his face. He exclaimed, "This little wheel is well designed~! With this thing, in the future The abrasion of the hemp rope will be much smaller~! Never fear that the rope will be worn off~!"
Li Zexuan smiled and said, "Oh~! Not bad~! Qingque, you can see this, it's not easy~! But you only know one, you don't know the other~! Iron egg, Come and have a look, what's the use of the small wheels on the connecting rod~?"
"Yes, Master~!"
Tie Dan Yiyan came over and began to look at the drawings seriously. After a while, he hesitated and said: "Master~! Except for the small wheel at the top of the connecting rod, the one connected below is probably another mystery~! "
Li Zexuan glanced at Tie Dan with admiration and smiled: "Yes, not bad~! Tie Dan is very accurate, so do you know what is the secret of this little wheel~?"
Tie Dan said embarrassedly: "Sorry, Master~! I can't see it~!"
Li Tae muttered: "Isn't it just a broken wheel~! What is the mystery~?"
Li Zexuan was too lazy to argue with the little fat man, pointing to the drawing and explaining to them:
"Iron egg~! Green bird~! I call this small wheel a pulley~! The top of the wheel is called a fixed pulley. You can all guess its function, which is to fix the fulcrum, prevent messy ropes, and reduce rope wear. Function, the following pulley is called a movable pulley, its function is great, it can save half of the force~!"
Tie Dan and Li Tai were shocked when they heard this, and couldn't say: "Save half the effort~? How is this possible~?"
Li Zexuan smiled indifferently: "Why is it impossible~? When using the movable pulley, the hook is suspended by two ropes, and each rope only bears half the weight of the hook, so the person pulling the rope only needs half the strength You can pull it~! When you learn another course in physics in the future, you will know a theorem, called power multiplied by power arm equal to resistance multiplied by resistance arm.
The power arm of the moving pulley is twice the resistance arm, so the power is half the resistance~! At that time, if you use this theorem to analyze it, you can find that the movable pulley is indeed labor-saving in principle. "
Although Li Zexuan's remarks contained many professional terms Li Tai had never heard before, the little fat man still felt that Li Zexuan's words made sense. He held his chin and fell into contemplation.
Tiedan nodded ignorantly, and said in confusion: "Master, if it's like what you said~IndoMTL.com~ Then we use more moving pulleys, wouldn't it be possible to use a small amount of effort to lift thousands A catty weight~?"
Li Zexuan nodded approvingly, and smiled: "Tie Dan, you asked this question very well. That's right. In theory, it's true. Do you remember what I told you before~? Extremely, ordinary people can lift tens of thousands of catties of boulders, but Master didn’t lie to you~!"
Li Tai's eyes widened, and he was shocked to speak. What Li Zexuan said was nothing short of a fantasy for him, and it would not be an exaggeration to call it a fairy family method.
Tie Dan nodded excitedly and said: "Hmm~! Master, I remember~! I didn't expect to see this kind of wonder so soon~!"
Li Zexuan smiled and shook his head: "However, in theory, the more you move the pulley, the more effort you will save, but it involves the question of whether it is worthwhile~!"
"What's not worth it~?"
Iron Egg asked in confusion.
Li Zexuan smiled and said: "Although the use of movable pulleys saves effort, the distance that the power moves is twice the distance raised by the hook, that is, the distance is spent, which involves the issue of efficiency.
For example, using a wooden stick to pry an ant, and a crowbar to pry an elephant, do you say that the crowbar is labor-saving, or is it laborious~? The same is true for pulleys. Use a pulley block that lifts ten thousand catties of boulders to lift a basket of bricks. Obviously the pulley block is heavier than the bricks, which is definitely not cost-effective~! "
Li Zexuan smiled and said: "Although the use of movable pulleys saves effort, the distance that the power moves is twice the distance raised by the hook, that is, the distance is spent, which involves the issue of efficiency.
For example, using a wooden stick to pry an ant, and a crowbar to pry an elephant, do you say that the crowbar is labor-saving, or is it laborious~? The same is true for pulleys. Use a pulley block that lifts ten thousand catties of boulders to lift a basket of bricks. Obviously the pulley block is heavier than the bricks, which is definitely not cost-effective~! "
(End of this chapter)