Otaku Engineer in Great Tang Dynasty

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"Giggle~! Don't you even need to ask? Looking at the expression of brother Qingque, he must have failed~! I just said that without my brother's help, he would definitely not succeed~!"

Laner pointed at Li Tai and giggled.

To expose people but not to expose shortcomings, Laner's words are not cruel, they directly poked 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: "Okay, okay~! Laner, go and play~! I'll find you when I'm done~!"

After all, he took the pen and paper from Li Tai's hand and sat down in front of the book desk beside him.

Seeing this, Laner also understood that Li Zexuan was busy with business next, and it was all business that she was not interested in, so she said "oh" and went out.

Li Tai breathed a sigh of relief, leaned over and asked curiously, "Xiaoxuan, what kind of brick mover are you going to design~? Can it be compared to mine~?"

The charcoal pen in Li Zexuan's hand paused and said with a sneer, "Haha~! It's just that you have the nerve to take it out and compare it with me~? Just watch it carefully~!"

After all, he was too lazy to talk nonsense, and began to sink his mind and draw.

When it comes to cranes, we have to talk about the pulley block on the crane. In addition to the hydraulic transmission mechanism, the most important part of the crane is the pulley block. The fixed pulley acts as a fixed fulcrum to prevent the rope from being messed up, and the movable pulley mainly saves force. As long as the pulley block is properly designed, it is not uncommon for one person to lift a 1,000-pound weight~!

"Let's get a simple crane first~!"

Li Zexuan had an idea in an instant. Three-dimensional models of the crane's base, connecting rod, pulley block, hoisting mechanism, and luffing mechanism appeared in his mind. These components, under Li Zexuan's pen, quickly formed a beggar with wheels. version of the crane.

No way. Although Li Zexuan can draw three-dimensional models of modern large cranes, almost all of them are hydraulic cranes. Even if he draws them, he cannot do it at the industrial level of this era. Therefore, after much deliberation, we can only do this kind of manpower crane based on the pulley block as the core.

"This is the end of the painting~?"

Seeing that Li Zexuan had stopped writing, Li Tai couldn't help but leaned forward and asked.

Li Zexuan nodded and said, "Yes~!"

Li Tai frowned and picked up the drawing. After looking at it for a long time, a hint of surprise appeared on his face, and he said with admiration: "This little wheel is well designed~! With this thing, the hemp rope will be affected by The wear and tear will be much smaller~! No longer afraid that the rope will be worn out~!"

Li Zexuan said with a smile but not a smile: "Oh~! Not bad~! Qingque, you can see this, it's not easy~! But you only know one of them, but you don't know the other~! Damn, come and see Look, what's the use of the little wheel next to this connecting rod~?"

"Yes, Master~!"

Tie Dan walked over according to the words and began to look at the drawings seriously. After a while, he hesitated: "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~! You've read Tie Dan very accurately, so do you know what's the mystery of this little wheel~?"

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

Li Tai muttered: "Isn't it just a broken wheel~! What mystery can there be~?"

Li Zexuan was too lazy to argue with the little fat man, and pointed to the drawing to explain to them:

"Iron egg~! Qingque~! I call this small wheel a pulley~! The top one is called a fixed pulley. You can guess its function, which is to fix the fulcrum, prevent the rope from being messed up, and reduce the wear and tear of the rope. The following This pulley is called a moving pulley, and its effect is great, it can save half of the force~!"

Tiedan and Li Tai were shocked when they heard the words and couldn't believe it: "Saving half of the effort~? How is this possible~?"

Li Zexuan smiled indifferently and said, "Why is that impossible~? When using a moving 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 to use half the strength to pull it. Gotta move~! When you take another course in the future—physics, you will know a theorem called the force multiplied by the force arm is equal to the resistance multiplied by the 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, when you analyzed this theorem, you could find that the moving pulley was indeed labor-saving in principle. "

Although Li Zexuan's remarks contained many technical terms that Li Tai had never heard of before, the little fat man still felt that what Li Zexuan said was very reasonable, and he pinched his chin and fell into contemplation.

Tie Dan nodded ignorantly, and said suspiciously: "Master, if it's really like what you said, then we can use more moving pulleys, can't we use very little strength to lift several thousand kilograms of heavy objects~?"

Li Zexuan nodded approvingly and said with a smile, "Iron egg, you asked a very good question, yes, in theory, it is indeed the case, remember what I told you before~? Engineering has developed to the extreme, ordinary Anyone can lift a 10,000-pound boulder, but Master didn't lie to you~!"

Li Tai's eyes widened and he was speechless in shock. What Li Zexuan said was nothing short of a fantasy for him, and it was not an exaggeration to call it a fairy tale.

Tie Dan excitedly nodded and said, "Hmmmm~! Master, I remember~! I didn't expect to see such a wonderful sight so soon~!"

Li Zexuan smiled and shook his head: "But although theoretically

It is said that the more pulleys, the more labor-saving, but this also involves the question of whether it is worth it~! "

"What's not worth it~?"

Iron Egg asked in confusion.

Li Zexuan said with a smile: "Although the use of the moving pulley saves effort, the distance that the power moves is twice the distance that the hook code is raised, that is, the distance is spent, which involves the problem of efficiency.

For example, using a wooden stick to pry an ant, and using a crowbar to pry an elephant, do you think the crowbar is labor-saving or labor-intensive~? The same is true for pulleys. Using a pulley block that lifts 10,000 catties of boulders to hang a basket of bricks is obviously heavier than the bricks, so it is definitely not cost-effective~!

Therefore, when deciding the number of pulley blocks, you must consider the actual situation, how big the horse is with how big the saddle, and don't do more useless work~! "

There are not many professional terms in these words, and it is not difficult to understand them. Tie Dan and Li Tai both realized something after listening to them, and fell into deep thought.

"I understand, thank you Master for his teaching~!"

After a long time, Tie Dan came back to his senses from his contemplation and solemnly clasped his fists.

Li Tai was also awake, and he said with a serious face: "Tai also benefited a lot after listening to Mr., thank you sir~!"

At this time, he realized that Li Zexuan was right, the brick mover he made was indeed a piece of junk~!

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