Doomsday Bunker Upgrade

Chen Xin was not too anxious to deal with the surge in vegetable production. As long as the vegetables are not harvested, they will not be damaged if they are planted on a 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 output.

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

After all, they add up to two or three thousand kilograms of vegetables. According to the agreement between Chen Xin and the SWAT team, so many vegetables need to be traded for them. Chicken and fish 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 kilograms of vegetables, if it was before the disaster, it might be sold out in a day or two in the vegetable market, 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 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 he didn't want to go back, so Chen Xin still had to find a way to get rid of the 1,000 catties of vegetables, especially since he brought back sweet potato seedlings from his hometown and needed to free up a layer of planting trays in the planting greenhouse for planting. Chen Xin couldn't have it. 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 on the SWAT team can expand the transaction volume a little, but considering the things that can be exchanged, the potential for this part of the transaction to be tapped is limited. At most, Chen Xin exchanges some more shelter rations and living materials every month.

And this part of the things he can find other people in exchange, especially Chen Xin is cooperating with the country, other things may be a bit difficult, but food and living materials, even if Chen Xin wants to ask for it, he can still ask for it. arrived.

Therefore, after thinking about it and 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 can be regarded as 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 time to harvest the crops in the greenhouse, and did not say anything more.

In the face of Mo Qingyan's indifference, Chen Xin felt helpless for a while, but with his parents by his side, Chen Xin really couldn't deal with this kind of emotional problem, and he really always regarded Mo Qingyan as a friend, and he didn't. The idea of ​​developing a relationship beyond friendship can only be put on hold for the time being and dealt with coldly.

After dealing with these things, 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.

Regarding the lack of 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 by himself while wearing the exoskeleton.

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

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

After all, as the main moving parts, the joints are also the main points 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 so 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 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. It can swing from 0° to 70° in a limited way, and can reach 90° after adjustment. Although it is not too flexible in use, it is enough.

The rest is a shoulder joint, which is a typical pendulum connection. It is responsible for connecting the shaft joint structure of the back and the main part of the arm. It is the most important movable joint in the upper limb of the entire exoskeleton, and it also has the largest range of motion. a joint.

The cooperation of these two joints can theoretically allow the arm to swing back and forth up and down, but due to structural problems, the pendulum range of the shoulder joint is only 0°~120°. This swing range cannot even salute the French military. Respect the German military salute during World War II.

To improve 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 considered using universal joints, magnetic joints and spherical joints of air bearings as the connection method, but the results of the samples were not satisfactory after trial, which would not only make the structure of the exoskeleton more complicated, but also make the exoskeleton more complicated. It will interfere with the booster structure, and the flexibility that can actually be improved is really limited.

This made Chen Xin scratch his head very much.

Really can't think of an improvement method, Chen Xin chose to throw away the plan of discarding the whole table after being irritated, and decided to play a game to relax, and also wanted to find inspiration from sci-fi games.

Turning on the game console, Chen Xin pulled the game with the handle. "Halo" and "Mass Effect" are of little reference value. They are power armor, and the structure that wraps the whole body is completely different from the exoskeleton structure that is just two iron rods.

On the contrary, the exoskeleton in "Call of Duty 11" made Chen Xin feel bright, but after careful observation, he could only partially learn from it.

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

This structure is of course 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 and lose its original effect in a low temperature environment of minus tens of degrees. Disconnection in use and wear of the magnetic surface are all issues that need to be considered.

And the most important thing is that there is no problem with the design in the game, you don't need to consider whether the technology can do it, 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 spherical joints was ruled out by Chen Xin.

However, it is easy to rule out a solution, and 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 joint based on the original two shoulder joints. thereby increasing flexibility.

The shaft connection joints on the back remain unchanged, and the original pendulum connection on the shoulders is changed to a disc-shaped connection structure, which integrates the booster structure and the joints. The motor drives the rotation of the inner structure of the disc to achieve 0°~270° ° rotation angle.

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

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

After solving this problem, the biggest problem for the whole set of exoskeleton protective clothing is solved. As for the high-performance battery and the problem that the helmet reflected by Chen Xin's father is too large, this is very easy to solve.

According to the advice provided by my father, I reduced the original huge helmet, and changed it from the original space suit-like hood to a motorcycle helmet that completely fits the head, only the eyes are partially transparent, and is connected with a breathing mask. The style of the exoskeleton suit, Chen Xin finally made a new set of test samples.

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 on the whole suit of exoskeleton suit.

Although it is a bit cumbersome, Chen Xin feels that this is an acceptable level. After all, it is only a civilian type. There is no need to consider the need for quick wearing and taking off. As long as you can ensure that you can wear and take off independently, and it will not be too time-consuming and laborious.

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

Regarding the issue of joints, spherical magnetic attraction is indeed possible, but at present, the material is not. Air bearing isolation from friction is also possible, but the cost is too high. So it is still simple to drive the turntable directly by the motor.