Rising: Ten Thousand Years Chapter 501: : The sky of thought
Shield machine.
This is still a novel concept for New Kyushu.
Even in Zhang Zhi's era, ordinary people had never heard of this kind of machine.
It's not as simple as it sounds. It's not what everyone thinks, a drill bit in front can push forward.
Shield tunneling actually means that the two are integrated.
A complete shield machine should be equipped with a tunnel boring machine in the front to advance forward, and a construction machine in the rear to lay the tunnel while excavating. Prevent the excavated tunnel from collapsing, or the upper soil layer and rock layer falling due to vibration and then filling the tunnel.
The principle of the boring machine is not difficult, but it is not as simple as a simple drill bit.
The difficulty of building a machine seems to be as high as the sky. At least for New Kyushu, it is as difficult as ever.
Ma Jianbin convened the Institute of Physics to set up a shield machine team, and studied for a month or two, but he couldn't figure out what the principle of the machine was.
Even the more I study, the more I feel that the scientific principles here are so strange. It seems to be a simple matter of digging a hole, why is it so difficult?
Ma Jianbin said: "Mr. Li, I'm afraid the shield machine is really not that simple. Because what we face when digging a tunnel is not the soil layer, but the rock layer. It is extremely difficult to open a tunnel in the rock. First of all What we have to face is the design of the drill bit.”
Li Zhen asked: "Is there any difficulty in designing the drill bit?"
"The strength requirements of the drill bit can be met, but the style design of the drill bit is difficult. There are electric drills in New Kyushu. We got inspiration from the electric drill and designed the drill bit with helical and expansion patterns. But then we found that , it won't work. The shield machine is not a big electric drill at all. You can easily drill holes in wood with an electric drill, and you can even drill holes in metal. But you can't drill holes in stone.
Stone is different from other substances. It will be shattered by that kind of high-frequency vibration. If a large electric drill is placed in a rocky mountain to dig, then if one fails, it will directly cause landslides and ground cracks. Security issues have been greatly troubled. So the shield machine is by no means as simple as a large electric drill. There should be a way to achieve a stable balance that can open holes in the stone without cracking the stone. "
Li Zhen nodded, feeling a little troubled in his heart.
Zhang Zhi also found some information for him from the Internet for his reference, but Li Zhen didn't fully comprehend it. That thing was also a sophisticated science and technology in Zhang Zhi's time, and even many countries needed to import it. Can't produce it at all.
Li Zhen said: "There should be two aspects that cause cracks in the stone..."
Before Li Zhen finished speaking, Ma Jianbin interjected: "High-frequency vibration, and expansion-oriented development."
The so-called expansion type development is a term invented by Ma Jianbin and the others, which means that the drill bit is tapered, with a sharp front and a thick rear. Like a wedge. The front is drilled in, and the rear is forced to squeeze in, which causes expansion and expansion, and will break the hard stone.
"Yes, it is these two reasons. Therefore, the design of this drill bit must meet the rigid requirements of two aspects."
"What?"
"One is that the rotation speed of the drill bit is not large, but the torque is large. The second is that the drill bit must be cylindrical and parallel. It is very simple to meet the first requirement, but the second requirement is relatively difficult, that is, The contact surface between the drill bit and the mountain is very large. And the front side cannot be sharp, but must be flat.”
Ma Jianbin smiled wryly: "Yes, Master Li, we also discovered this problem. We made a cylindrical drill bit with a completely flat front to drill holes in rocks. This kind of drill bit is completely flat. Using a high-speed rotation in a way like grinding a stone, it actually opened a smooth hole in the stone. The structure is completely formed. But..."
"But what?"
"But do we need such a drill bit to dig a tunnel? It's just a solid cylinder with a diameter of a few meters or even more than ten meters without any technological content? A drill with a diameter of nearly 10 meters for drilling holes on the mountain is not of the same grade. First of all, a solid cylindrical rotary head with a diameter of more than ten meters weighs at least ten tons. Our science and technology are completely incapable of making such a drill High speed rotation.
If a mechanical principle is used, it produces high torque and low speed rotation. The maximum speed of the drill bit can only reach dozens of revolutions per minute, or even more than ten revolutions. Such a low speed is completely as efficient as dripping water through a stone. It's not as fast as blasting and manual work. Moreover, even if we have the ability to produce such a powerful engine, even a ten-meter-diameter drill bit has the same high speed as an electric drill. Then the vibration caused by the weight of the drill bit more than ten tons will increase exponentially, and it will not be a problem to shake a mountain down. "
Ma Jianbin sighed deeply: "So, it's difficult."
Li Zhen smiled and said: "Actually, it doesn't hurt to change the way of thinking. What if there are hundreds of small drill bits rotating at high speed at the front end of a large flat drill bit with a diameter of several meters?"
"What do you mean?"
"The principle of the whetstone. Use a flat drill bit to remove the diamond head. This principle is the same as that of the whetstone. Increase the sand texture and roughness, and increase the friction. Why can't you think about how to increase the friction hundreds of times? Just imagine, if the big drill bit rotates slowly, the side in front of the drill bit that is in contact with the mountain, If hundreds of small drill bits rotate in the opposite direction, or rotate along the trend, will the friction force increase by a hundred times or a thousand times?”
Suddenly, Ma Jianbin's eyes lit up, and he stood up abruptly. He hit his head against the wall so hard that he didn't care about the pain, and exclaimed: "Is that so? Yes, why didn't I think of it? Li Teacher, you are simply the light that God bestowed on this world~IndoMTL.com~Yes. During the slow rotation of a main drill bit, hundreds of small drill bits rotating at high speed are attached to the main drill bit. Isn’t this equivalent to several Hundreds of people use hundreds of electric drills equipped with that kind of grinding stone electric drill bits to dig tunnels by hand? A mountain cannot withstand a large drill bit that rotates at a super high speed and emits a super high vibration frequency. But it can definitely withstand hundreds of small electric drills It was polished on it. The vibration from the small electric drill is too weak for a mountain."
"Master Li, you are a genius!"
Li Zhen smiled: "I just put forward an idea. However, there are many difficulties in the specific design that you need to overcome. It may even be impossible to overcome. I don't know if you have the ability to do this kind of craftsmanship. , On a rotating drill bit, it is a headache to think about designing hundreds of small drill bits that rotate at high speed at the same time inside the drill bit.”
"This idea is already very impressive. You said that going from zero to one is the most difficult, but going from one to a thousand is the easiest. Everything is difficult at the beginning. Now we have an idea, at least Knowing which direction to go. This is one step to the sky!"
Ma Jianbin was excited and ecstatic.
Others followed suit.
This kind of excitement and ecstasy of breaking through the ideological barrier in the scientific predicament is beyond the reach of ordinary people.
Using a slang expression to express such a mood, it is:
Compared to love, it makes people feel more happy and excited.
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