Otaku Engineer in Great Tang Dynasty

"Hey~! Do you still have to ask the iron egg? Looking at the expression of Brother Qingque, he must have failed~! I said that without my brother's help, he would definitely not succeed~!"

Lan'er pointed at Li Tai and giggled.

Lan'er's words were not cruel, but Li Tai's heart was pierced directly. The little fat man's face turned black and he almost vomited 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 all, he took the pen and paper in Li Tai's hand by the way, went to the side of the bookcase and sat down.

Upon seeing this, Lan'er also understood that Li Zexuan was going to be busy next time, and it was 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, then sneered, "Haha~! You are ashamed to compare your broken gadgets with me~? You just 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 and prevents messy ropes. 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~!

"Let’s get a simple crane first~!"

Li Zexuan had an idea instantly. Three-dimensional models of the crane base, connecting rod, pulley block, lifting mechanism, and luffing mechanism appeared in his mind one by one. In Li Zexuan's pen, these components quickly formed a beggar with wheels. Edition crane.

No way, although Li Zexuan can draw three-dimensional models of modern hairstyle cranes, they are almost all hydraulic cranes. He has drawn 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.

"This is 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 designed well~! With this thing, the hemp rope will be affected in the future. The wear 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 thing, don't know the other~! Iron egg, come and see Look, what's the use of the small wheels on the side of the connecting rod~?"

"Yes, Master~!"

Tie Dan Yiyan walked 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 said with a smile: "Not bad~! Tie Dan is very accurate, so do you know what's the secret of this little wheel~?"

Tie Dan said embarrassedly: "Sorry, Master~! I can't tell~!"

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 guess its function, which is to fix the fulcrum, prevent messy ropes, and reduce rope wear. This pulley is called a movable pulley, and its role is great, it can save half of the force~!"

Tie Dan and Li Tai were shocked when they heard this, and couldn't believe them: "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 of the weight of the hook, so that the person pulling the rope only needs half the strength to pull it. Have to move~! When you learn another course in physics in the future, you will know a theorem, which is 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 of 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 technical 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.

Tie Dan nodded ignorantly, and said in confusion: "Master, if it is really like what you said~www.ltnovel.com~, then we use more movable pulleys. Wouldn't it be possible to lift several thousand catties with a small amount of effort? Weight~?"

Li Zexuan nodded approvingly, and said with a smile: "Tie Dan, you asked this question very well. That's right. In theory, it is true. Remember what I told you before~? The engineering has developed to the extreme, ordinary People can lift ten thousand 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 it will be saved, but it also involves the question of whether it is worthwhile~!"

"What's not worth it~?"

Tiedan asked wonderingly.

Li Zexuan smiled and said: "Although the use of movable pulleys saves effort, the distance that the power moves is twice the distance that the hook rises up, that is, it takes distance, which involves the issue of efficiency.

For example, use a wooden stick to pry an ant, and use a crowbar to pry an elephant. Do you say that the crowbar is labor-saving or labor-intensive? 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 that the hook rises up, that is, it takes distance, which involves the issue of efficiency.

For example, use a wooden stick to pry an ant, and use a crowbar to pry an elephant. Do you say that the crowbar is labor-saving or labor-intensive? 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)