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Chapter 797 Unrealistic Ideas

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    Can the cutterhead of the shield machine be replaced with a drill bit?

    If someone else asked this question, the staff might not even bother to answer, and would just give that person a blank stare.

    “But it was Chen Xin who asked this question, so the staff had to seriously consider how to answer and explain it so that Chen Xin could understand that this was impossible and at the same time save him face.

    However, even so, in the eyes of the staff, this idea is still impossible.

    Although the cutterhead of the shield machine is equivalent to a huge drill bit, the staff also understood that Chen Xin meant whether the large plate-like cutterhead in front of the shield machine could be replaced with a pointed drill bit.

    After all, in the eyes of many people, that kind of pointed drill bit is very efficient in drilling holes, so much so that in many cartoons or some science fiction works, there is a kind of drill that can quickly drill holes in the soil with a big drill bit in front.  Excavation machinery exists.

    The specific principle is quite difficult to explain, but there is a very simple and easy-to-understand explanation, that is, if the spiral drill bit is so easy to use, why doesn’t everyone use such a drill bit to dig holes?

    The answer is of course very simple. Of course it is not easy to use. We don’t use drills like that.

    In fact, anyone who knows a little bit about drill bits will find that the structural front ends of most drill bits are basically flat, and there are very few very sharp drill bits.

    This is mainly because drill bits are usually used to drill hard objects. If the drill bit tip is made too sharp, it will be easily worn away, affecting the service life and effect of the drill bit.

    Therefore, most drill bits adopt a head design as flat as possible and are made of hard metal to enhance their durability.

    The cutterhead of the shield machine is actually a rotating mechanism with grooves, and a large number of blades are installed on it to cut rocks and soil. Although it can be regarded as a huge drill bit, this does not mean that  The cutter head of the shield machine is really a drill bit.

    When the cutterhead of the shield machine works underground, it will encounter various strata. These different strata have different hardnesses, which causes the stress on the cutterhead to be very complicated. It is not like a spiral drill bit that works in a uniform medium.  The stress is not considered.

    Therefore, the machines with drill bits on the front end in cartoons and science fiction works are only imagination and cannot be applied in reality.

    After listening to the staff’s explanation, Chen Xin was naturally a little embarrassed and felt that his idea was a bit too whimsical.

    But his idea is not entirely impossible. After all, with the system in hand, Chen Xin can do many things that others cannot.

    Of course, even if there is a system as a backer, Chen Xin will not win blindly. Now that professionals say that changing drill bits is not feasible, he will not insist on giving it a try.

    The most appropriate way is to do an experiment first. Just like when we first built the dome city and ecosystem, do a few simulation experiments and you will naturally know whether it is feasible.

    After understanding this, Chen Xin did not continue to embarrass the staff. He just told him that a super large shield machine might be needed to perform the task, and then left the factory.

    ——————————————————

    Back in his office, Chen Xin first input the shield machine drawings brought back from the factory into his watch, and then used nanomolecules to project them.

    Looking at the shield machine model projected in front of him, Chen Xin studied the model while thinking about how to upgrade it.

    To put it bluntly, the principle of the shield machine is that the front end is constantly cutting, and then the segments are installed into the excavated pipes at the back, thereby achieving rapid construction of the tunnel.

    So what affects the working efficiency of the shield machine is the cutting efficiency of the front-end cutterhead.

    This is why Chen Xin wanted to replace this cutterhead with a drill bit. In his opinion, the cutting efficiency of drill bits is undoubtedly higher than that of this cutterhead.

    Although professionals in the factory said this was unlikely, Chen Xin did not give up the idea completely.

    With the idea of ??giving it a try, Chen Xin first upgraded the drawings of the shield machine and adjusted it to a form where the front end is a large drill bit.

    Then we started the virtual simulation system, intending to simulate and test the actual use of this structure.

    However, the result disappointed Chen Xin, because the drill bit was solid, and due to constant cutting and friction during underground drilling, a large amount of heat was generated that could not be dissipated. In the end, it was damaged due to local high temperature and wear before digging very far.

    ?Obviously, this plan is indeed whimsical and not very practical.

      Therefore, Chen Xin quickly adjusted his thinking.

    Since the drill bit is not practical, what about adjusting the structure of the cutterhead?

    With this idea, Chen Xin once again upgraded and adjusted the drawings, upgrading the original cutterhead of the shield machine to a slightly convex shape in the center, and optimizing the structure.

    This time the effect was satisfactory. Although there was not much improvement in excavation efficiency, this adjusted shield machine still completed the excavation smoothly.

    Such results undoubtedly encouraged Chen Xin and also clarified his thinking.

    We gave up the idea of ??an impractical drill bit and instead studied the cutterhead structure and working methods of the shield machine in order to improve its working efficiency.

    The cutterhead of the shield machine is mainly used to loosen, crush and excavate soil or rocks underground. Because of its huge size, its working speed is not fast, and it can even be said to be slow.

    After all, if it goes too fast, the heat generated by the friction will be amazing.

    Chen Xin tried to double the rotation speed of the shield machine's cutterhead, but the result was not an improvement in work efficiency. Instead, the cutter head on the same cutterhead melted and wore out due to high temperatures, and eventually the entire cutter  The disk is damaged.

    This undoubtedly placed great restrictions on Chen Xin, requiring him to think of more appropriate solutions.

    Although the system upgrade can do things that cannot be done under normal circumstances, the basic physical laws that should be observed still need to be observed. If Chen Xin cannot perfect a reasonable and feasible solution, then even the system upgrade will only be a waste of time.  It's just industrial waste with no practical value.

    Therefore, Chen Xin must carefully conceive a reasonable plan and at the same time make a breakthrough while being reasonable. This is also a very difficult thing for him.

    “In particular, he needs to come up with a feasible plan as soon as possible so that the military can start implementing it as soon as possible and save time.

    "Hey, it looks like I have to work overtime again!" Chen Xin smiled bitterly, but he was not too frustrated. Instead, he cheered up and went into work.

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