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Chapter 382 Shield Machine

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    Manufacturing a shield machine is actually not as difficult as many people think, because the world's first shield machine was born two hundred years ago at the end of the 18th century. It also used human hand digging and today's large mechanized shield machines.  Compared with other institutions, there is no part with high technological content.

    But although the early shield machine had a simple structure and nothing high-tech, it was the originator and the source of the principle of today's modern shield machine.

    Chen Xin wants to build a shield machine by himself. Unless he finds another way to design it from scratch, otherwise, he cannot avoid the principle of shield machine that has been laid the foundation for more than two hundred years ago.

    The principle of the shield machine is not complicated. The main principle is to build a "shield" to protect the tunnel and resist tunnel collapse while the tunnel boring machine is digging forward, that is, repairing it while digging.

    Of course, with the advancement of science and technology, although the principle of today's shield machines is still the same, some large or super-large shield machines no longer need to build a "shield" during the excavation process. They can directly use it during the excavation process.  The tunnel is repaired and is convenient and fast.

    The basic principle of the shield machine comes from a marine organism - the shipworm. This organism will continuously dig into the wood and secrete mucus during the tunneling process to protect the wood around its body from being damaged by seawater corrosion and expansion.  .

    So for Chen Xin, who does not need a regular shield machine, he only needs to build a machine that can quickly dig into the snow, and support the excavated tunnel so that it does not collapse before the pipeline construction is completed.

    And these two points are actually not difficult to do.

    Snow is not frozen ice. Although it has a certain hardness, it is much easier to excavate than soil. Moreover, the internal texture of snow is uniform and there is no complicated structure. There is no need to consider the rock formations or other objects encountered during the excavation process.  Problems with complex geological structures.

    As for the second point, it is easier to solve. With the current ambient temperature, you only need to slightly heat the excavated tunnel wall during the excavation process, so that the snow on the tunnel wall melts and quickly condenses, and a layer of ice can be constructed.  The shell is used to support and protect the tunnel from collapse.

    ¡°After all, it¡¯s just snow, not a complex geological structure. It¡¯s enough to have a layer of ice shell to support it.

    Having made these two points clear, primary school students may not be able to make a usable shield machine, but middle school students with stronger hands-on skills can complete this design.

    A cylinder is used as the main structure, and a relatively hard metal is used to make a blade or drill like a fan blade in the front. A circle of electric heating wire is laid on the outer shell to melt snow and internal insulation. This thing is basically completed and can be used for construction.  demand.

    As for the rest, it is nothing more than optimizing the internal mechanical structure and adding some auxiliary functions.

    For example, the fan blades or drill bits in front can be shaken manually, or a motor can be added to make them mechanically powered. The dug snow can be transported manually or mechanically. Even Chen Xin was willing to spend some effort to turn it on.  The entire shield machine is made fully automatic. It can dig itself into the snow and complete the entire construction.

    It¡¯s just that Chen Xin is a little hesitant about how big of a device he wants to build.

    Build a big one, dig a tunnel directly, and then workers go in to set up the pipeline. This is naturally a simple and crude way, and in this way, the machine does not need to be too complicated and advanced, and it can excavate quickly.

    But in this case, the construction speed will be relatively slow. After all, the larger the excavation surface will be, the amount of snow work that needs to be excavated will be doubled, and the construction period will be longer.

    As for building a small one, or simply just as thick as a pipe, and digging and connecting the pipe at the same time, this will undoubtedly save a lot of trouble.

    It¡¯s just relative. If you build a small shield machine, the technical content will undoubtedly be improved a lot.

    After thinking about it for a while, Chen Xin weighed the pros and cons between the two and chose the small shield machine.

    After all, for him, improving technical content is the simplest thing.

    With a multifunctional robotic arm, it is not difficult to process such a shield machine. You only need to cut a section of pipe, install a drill bit for excavation on one end of the pipe, and connect a pipe inside for extraction and excavation.  The "shaved ice" that comes down is finally connected to the motor to provide power and power supply, and this thing is considered ready.

    Of course, although this thing is said to be ready and can be used to start working, if it is really going to be put into use for excavation operations, Chen Xin still needs to give him a small upgrade.

    For example, if a microcomputer is installed on it, the device?It can be remotely controlled or programmed to operate automatically, which is still necessary.

    Chen Xin has even considered equipping this little thing with a 3D printer, which can print pipelines directly while digging, and even the pipeline itself can be omitted.

    "However, after Chen Xin thought about it for a while, he still didn't do it. He just installed a remote control on the small shield machine he made to ensure that he could control the machine forward, backward, and stop remotely.

    The final shield machine is like a bullet. The front end is a hollow drill bit, which cuts ice and snow through the arc-shaped cutting edge, and then pumps away the cut snow through a pipe inside the drill bit to ensure that the drill bit can move forward smoothly.

    In addition to the pipe, there is a heating ring behind the drill bit, which is used to heat the snow around the entire shield machine, allowing the snow to melt and then quickly freeze under the influence of low temperature to form an ice shell to stabilize the tunnel.

    The power of the entire shield machine comes from a small-power motor installed by Chen Xin, which is responsible for driving the drill bit and the track wheel at the bottom of the shield machine to move forward, and the power supply relies on a small battery.

    After Chen Xin completed the shield machine, he took it to the nearby snow and tried it. The results of the experiment were very ideal.

    The drill bit dug through the snow very fast. Chen Xin only let it drill for about three to five minutes before digging forward about two meters. At this speed, it is estimated that one hour is enough to dig 20-40 meters.  meters, which is much faster than relying on manpower to dig.

    Seeing that the shield machine he made was quite effective, Chen Xin was satisfied and prepared for the workers to start construction.

    But at this time, a worker raised a question to Chen Xin. The shield machine can indeed excavate quickly, but how to put the pipe into the tunnel?

    The diameter of the shield machine is only a few centimeters thicker than the pipe. It is no problem to put the pipe straight in along the drilled tunnel, but this pipeline is not a straight branch line, there is an elbow in the middle.  (Remember the website address: www.hlnovel.com
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