Doomsday Bunker Upgrade Chapter 276: Solve joint problems

Chen Xin is not too anxious to deal with the sudden increase in vegetable production. As long as the vegetables are not harvested, they will not be damaged if they are planted on the hydroponic tray, but the taste will become old.

However, this matter cannot be left alone. While thinking about how to improve the exoskeleton, Chen Xin is also thinking about how to deal with the surge in vegetable production.

Although there are a lot more people in the shelter than before, and the consumption has also increased, compared with the surge in production, the increased consumption is really not worth mentioning.

After all, it is two to three thousand kilograms of vegetables. According to the agreement between Chen Xin and the SWAT team, they need to be traded for one-fourth of the vegetables. The eight people in the shelter have reserved about one-tenth of their share. The chickens and fish raised can consume part of it, but still more than half of it remains, and there are at least 1,500 catties of vegetables that need to be considered.

More than 1,500 catties of vegetables, if they were dragged to the vegetable market before the disaster, they might be sold out in a day or two, which is not a problem at all.

Now after the disaster, although this is also a very tight and hard-to-find material, if Chen Xin is willing to sell more, people will want to buy it, but Chen Xin doesn't want to exchange these vegetables for a bunch of things that he can't use. .

But I don't want to go back, Chen Xin still has to find a way to get rid of the thousands of pounds of vegetables, especially since he brought back sweet potato seedlings from his hometown, he needs to free up a layer of planting trays in the planting greenhouse for planting. It is impossible for the new to let these vegetables still occupy the planting tray.

And more importantly, after the planting area in his greenhouse expanded and the output increased exponentially, he had to find a way out for the extra output every month.

The transaction from the SWAT team can expand the transaction volume a bit, but considering the things that can be exchanged, the potential of this part of the transaction share is limited. At most, Chen Xin can exchange some more shelter rations and life every month. Supplies.

And this part of the thing he can find other people in exchange, especially Chen Xin and the country are cooperating, other things may be a bit difficult, but food and living materials, even if Chen Xin asks for it, It can also be obtained.

So after thinking about it, and after carefully considering the pros and cons, Chen Xin decided to let Li Yulong sell the rest in his trading market, except for the expansion of the fixed transaction with the SWAT team.

On the one hand, this is a kind of support for Li Yulong's trading market, adding fresh vegetables as a saleable commodity, which can help this trading market to better open up.

On the other hand, this is also an investment. Since Chen Xin doesn't know what to exchange for these vegetables, it is better to use them as an investment to help Li Yulong, so that he can get more returns.

And this is also to find a way to consume the vegetable production that increases every month in the future, so as not to find a market for the increased vegetable production in the future.

After learning of Chen Xin's decision, Mo Qingyan did not express any opinion on the matter, but only confirmed to him the harvest time of the crops in the greenhouse, and did not say anything more.

Faced with Mo Qingyan's indifference, Chen Xin felt helpless for a while, but with his parents by his side, Chen Xin really couldn't handle this kind of emotional problem, and he really always regarded Mo Qingyan as a friend , did not develop the idea of ​​a relationship beyond friendship, and could only put this matter on hold and deal with it coldly.

After dealing with these matters, Chen Xin continued to devote his energy to improving the mechanical structure of the exoskeleton. After all, this is what he is most concerned about right now.

For the problem of insufficient joint flexibility of the exoskeleton, Chen Xin first adjusted the movable range of each joint and increased the movable angle of each pendulum connection.

After adjustment, the flexibility has been improved to a certain extent, at least now Chen Xin can remove the helmet on his head while wearing the exoskeleton.

However, the range of motion of the shoulder joint is still insufficient. The arm can only be extended horizontally, and cannot be extended backward or upward.

This is mainly due to the limitation of the structure itself and the need to install hydraulic telescopic rods for power assistance.

After all, joints are the main moving parts and also the main point of assistance. While adjusting the flexibility of the joints, Chen Xin must also consider the issue of the assistance mechanism.

The adjustment of the elbow joint is relatively easy, because the movable angle of the elbow itself is not too large, and it can be done by adjusting the length of the hydraulic telescopic rod of the power assist.

But the adjustment of the shoulder joint is not that simple.

The part of the shoulder joint is a total of two movable joints, one of which is an axis perpendicular to the back, located at the position of the scapula of the human body, and the entire structure of the arm part of the exoskeleton is connected to this axis. The main body connection of the exoskeleton is also the main joint where the arm part can swing back and forth.

The movement mode of this joint is that the shaft itself is fixed, and other structures connected to the shaft rotate around this shaft, which is limited by the structure itself, and the amplitude of the arm swinging back and forth is not too large in actual use. The root axis can only swing 0°~70° in a limited way, and it can reach 90° after adjustment. Although it is not too flexible in use, it is enough.

The rest is a joint of the shoulder. This is a typical pendulum connection. It is responsible for connecting the axial joint structure of the back and the main part of the arm. It is the most important movable joint of the upper extremity of the entire exoskeleton, and it is also an activity. The largest joint.

The combination of these two joints can theoretically make the arm swing up and down. However, due to structural problems, the pendulum amplitude of the shoulder joint is only 0°~120°. This swing amplitude is even respected by the French military. No, I can only pay tribute to the German military salute during World War II.

To improve the other connection methods of this joint will only make the structure more complicated. Although the flexibility does increase, the installation of the power assist mechanism becomes troublesome.

Chen Xin has considered using universal joints, magnetic joints and spherical joints of air bearings as the connection method, but the samples produced are not satisfactory after trial, which will not only make the structure of the exoskeleton better It is complicated and interferes with the power assist structure. In fact, the flexibility that can be improved is really limited.

This made Chen Xin scratch his head very much.

I really couldn't think of a way to improve it. After a fidgety session, Chen Xin chose to throw away the plan that was all over the table and decided to play a game to relax. By the way, he also wanted to find inspiration from sci-fi games.

Turning on the game console, Chen Xin took the handle and pulled the game. "Halo" and "Mass Effect" are of little reference value. They are power armor. The structure that covers the whole body is completely the same as the exoskeleton structure of two iron rods. different.

It is the exoskeleton in "Call of Duty 11" that makes Chen Xin feel bright, but after careful observation, he can only partially learn from it.

The back of the exoskeleton that appeared in "Call of Duty 11" is fixed, but the spherical joints of the same structure as the human body are directly used on the shoulders, and two spherical joints are connected, providing enough for the shoulders flexibility.

Of course this structure is possible, but the friction surface of the spherical joint is too large, and to ensure sufficient flexibility, a fixed structure cannot be used. It can only be wrapped with flexible materials like human joints or simply made into magnetic suction.

Of course, rubber is the first choice for flexible materials, but the current rubber can only be synthesized industrially, and it is easy to become brittle in a low temperature environment of minus tens of degrees and lose its original effect. How to ensure the stability of the structure if it is magnetically attracted , will not be disjointed in use, and the wear of the magnetic surface, these are all issues that need to be considered.

And the most important thing is that there is no problem with the design of the game. There is no need to consider whether the technology can do it or whether the structure is really reasonable. Even if it is designed as a magnetic levitation joint, others will only say that the technology is awesome.

But in reality, Chen Xin has to consider more, especially because he is thinking about the design structure under the premise of saving costs, it is even more impossible to adopt a structure that is too complicated or too expensive.

So after thinking about it, the connection method of the spherical joint was ruled out by Chen Xin.

While it is easy to rule out a solution, it is still difficult to solve the problem.

Fortunately, the mechanical structure in several games still gave Chen Xin a lot of reference. After careful consideration and comparison, Chen Xin decided to add a new shoulder joint based on the original two shoulder joints. Joints, thereby increasing flexibility.

The shaft connection joints on the back remain unchanged, and the original pendulum connection of the shoulder part is changed to a disc-shaped connection structure, which integrates the assist structure and the joints, and realizes the rotation of the internal structure of the disc by a motor. °~270° rotation angle.

At the same time, at the lower part of the disc structure, there is a rotating joint whose rotation axis and the rotation axis of the disc are perpendicular to each other, so as to ensure that the arm can rotate flexibly.

After this adjustment, the flexibility problem of the upper limbs of the exoskeleton is finally solved, so that the arm can be assisted while ensuring sufficient flexibility.

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According to the advice provided by my father, I reduced the original huge helmet and changed it from the original hood like a space suit to a fully fitted head, only the eyes are transparent, and a breathing mask is connected. In the style of the motorcycle helmet, Chen Xin finally remade a test sample of a set of exoskeleton protective clothing.

This time he put on the experimental exoskeleton suit by himself. Without the help of others, it took Chen Xin about five minutes to put the whole suit on his body.

Although it is a bit cumbersome, Chen Xin feels that this is an acceptable level. After all, it is only for civilian use. There is no need to consider the needs of fast putting on and taking off. As long as you can make sure that you can put on and take off independently, and it will not be too time-consuming and laborious. It's okay.

After putting on the experimental exoskeleton suit, Chen Xin turned on the power supply, walked into the elevator, and planned to go outside to test the effect of the exoskeleton suit.