Chapter 381: Shield machine

Text Chapter 381 Shield Machine
Manufacturing a shield machine is actually not as difficult as many people think, because the world's first shield machine was born at the end of the eighteenth century two hundred years ago, and it used human hand excavation and today's large mechanized shield Compared with the construction machine, there is no high-tech part.
However, although the early shield machines were simple in structure and lacked high-tech features, they were the originator of today's modern shield machines and the source of their principles.
Chen Xin wants to build a shield machine himself, unless he finds another way to design it from scratch, otherwise, the principle of the shield machine that has been laid for more than two hundred years cannot be avoided.
The principle of the shield machine is not complicated. The main principle is to construct a "shield" to protect the tunnel and resist tunnel collapse while the tunneling machine is digging forward.
Of course, with the advancement of science and technology, although the principle of the current shield machine is still the same, some large or super large shield machines no longer need to construct a "shield" during the tunneling process. They can directly integrate the shield during the excavation process. The repair of the tunnel is convenient and quick.
The basic principle of the shield machine is derived from a marine creature-the ship maggot, which will continue to dig on the wood and secrete mucus during the digging process to protect the wood around its body from being corroded and expanded by the seawater. .
Therefore, as far as Chen Xin is concerned, he does not need a formal shield machine, in fact, he only needs to build a machine that can quickly dig in the snow, and support the excavated tunnel without collapsing before the pipeline construction is completed.
These two points are actually not difficult to achieve.
Snow is not condensed ice. Although it has a certain degree of hardness, it is easier to excavate than soil. Moreover, the internal texture of the snow is uniform and there is no complicated structure. There is no need to consider the rock formations or other things encountered during excavation. The problem of complex geological structure.
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 formed. The shell is used to support and protect the tunnel from collapse.
After all, it’s just snow, not a complicated geological structure. A layer of ice crust is enough.
With these two points clarified, elementary school students may not be able to make a shield machine that can be used, but middle school students with stronger hands-on skills can complete this design.
A cylinder is used as the main structure, and a blade or drill bit like a fan blade is made of harder metal in the front. A circle of electric heating wire is laid on the shell for melting snow and internal insulation. This thing is basically completed and capable of construction Demand.
As for the rest, it is nothing more than optimizing the internal mechanical structure and adding a little auxiliary function.
For example, the fan blades or drill bits in the front can be shaken manually, or they can be mechanically powered by adding a motor. The digging snow can be transported manually or mechanically. Even Chen Xin is willing to spend some time and effort. The entire shield machine is made fully automatic, and it is possible to dig by itself as long as it is put in the snow, and it is also possible to complete the entire construction.
It's just that Chen Xin hesitated, how big a piece of equipment he had to build.
It is naturally a simple and rude way to build a large tunnel, dig a tunnel directly, and then the workers go in and erect the pipeline. In this way, the machine does not need to be too complicated and advanced, and it can be digging quickly.
But in this case, the construction speed is relatively low. After all, the tunneling surface will be relatively large if it is built. 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 the thickness of the pipe, it will undoubtedly save a lot of trouble while digging and connecting the pipe.
It's just relative. If you build a small shield machine, the technical content will undoubtedly be improved a lot.
After thinking about it, Chen Xin weighed the pros and cons between the two and chose a small shield machine.
After all, for him, improving the technical content is the easiest thing.
With a multi-functional robotic arm, it is not difficult to process such a shield machine. You only need to cut a section of the pipe. One end of the pipe is equipped with a drill bit for digging, and a pipe is connected inside to remove the excavation. The "shaved ice" that came down, and finally connected to the motor to provide power and power, this thing is even done.
Of course, although this thing is said to be done, it can already be used to start work, but if it is really put into use and rely on it for tunneling operations, Chen Xin still needs to give him a small promotion.
For example, it is necessary to install a microcomputer on it so that the equipment can be remotely controlled or programmed to operate automatically.
Chen Xin even considered attaching a 3D printer to this little thing, which can directly print the pipeline while digging, and even the laying of the pipeline itself can be omitted.
However, after thinking about it, Chen Xin didn’t do so. He just added a remote control to the small shield machine he made~EbookFREE.me~ to ensure that the machine can be moved forward, backward, and stopped by remote control. That's it.
The final shield machine is like a bullet head. The front end is a hollow drill bit, which cuts the ice and snow through the arc-shaped cutting edge, and then the cut snow away through a pipe inside the drill bit to ensure the drill bit can move forward smoothly.
In addition to the pipeline, there is a heating ring behind the drill bit, which is used to heat the snow around the entire shield machine, so that the snow melts and then freezes quickly under the influence of low temperature, forming an ice crust to stabilize the tunnel.
The power of the entire shield machine comes from a small power motor installed in it by Chen Xin, which is responsible for driving the drill bit and the crawler wheels at the bottom of the shield machine forward, and the power supply relies on a small battery.
After Chen Xin completed the shield machine, he took it to a nearby snowy field and tried it. The results of the experiment were very satisfactory.
The drill was digging very fast in the snow. Chen Xin only allowed it to drill for about three to five minutes, and then drove a distance of more than two meters. According to this speed, one hour was enough to dig 20-40. The distance of meters is much faster than digging by manpower.
Seeing that the shield machine he made was quite effective, Chen Xin was satisfied and prepared to let the workers start preparing for construction.
But at this time, some workers asked Chen Xin a question. The shield tunneling machine can indeed dig quickly, but how should the pipeline be put 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 along the drilled tunnel, but this pipeline is not a straight branch line, but there is an elbow in the middle.
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