Doomsday Bunker Upgrade

When a set of samples is made, it is natural to test them. Because they used the old work clothes of his father, Chen Xin also invited his father to help him test.

However, Chen Xin's father was not satisfied with the exoskeleton suit made by Chen Xin.

"I can't move my steps, I can't lift my hands, it's not suitable for work at all." Chen Xin's father put on this exoskeleton protective suit, and after moving his body, he gave his opinion: "And this helmet does It's too big and very inconvenient."

"Are there so many problems?" Chen Xin was a little surprised by his father's evaluation of the finished product.

Chen Xin's father wanted to take off the helmet on his head, but because of the joint structure of the exoskeleton, he couldn't bend his arm more than 90 degrees, so Chen Xin could only help take off the helmet.

Chen Xin's father, who took off the helmet, said to Chen Xin: "Even the helmet has to be taken off by someone else. How can there be no problem with your design? The exoskeleton must at least ensure the normal activities of the human body and not hinder it."

"Then let me adjust it. It should be a problem with the joint structure." Chen Xin listened to the advice given by his father very humbly, and he had already seen the problems in it.

Due to concerns about the cost, Chen Xin adopted a relatively simple design for the structure of the exoskeleton, but it is obvious that this overly improvised design greatly reduces the flexibility of the exoskeleton and cannot even meet the actual needs.

Helping his father to remove the exoskeleton from his body, Chen Xin asked his father again, "Dad, how does the protective suit look like?"

"It's a bit heavy, but fortunately, it's almost like wearing a padded jacket." Chen Xin's father unzipped the protective suit and took it off: "I feel a little stuffy when I wear it, but there are no other problems."

"That seems okay. I'll try to reduce some weight and adjust the breathability." Chen Xin took a pen and wrote down what his father said in the notebook beside him.

After taking off the slightly heavy exoskeleton protective suit, Chen Xin's father said to his son: "The problem with clothes is a small matter, the key is the exoskeleton, you are designed to do things for people. When you wear it, it will not affect the flexibility of your body first.

When designing a thing, you must first figure out what you designed it for. All your designs and functions should be designed around this core function. If your design deviates from this core function, then your design itself is wrong. Yes, no matter how well designed it is, it goes against your original purpose.

So think carefully, what is the purpose of your design of this thing, what do you want to do with it, what effect do you want to achieve, and whether your existing design is designed around this core. "

After saying this earnestly, Chen Xin's father patted his son on the shoulder, and was called by Chen Xin's mother to help.

Chen Xin was so taught by his father that he also readjusted his thinking and put the entire exoskeleton protective suit neatly on the workbench, intending to readjust it.

The problems mentioned by Chen Xin's father are summed up as a key point that there is a problem with the joint design of the exoskeleton part.

Actions that are easy to implement for human skeletal joints are not so easy to put on mechanical exoskeletons. The more flexible the mechanical joints, the more complex the mechanism.

In order to reduce costs, Chen Xin uses swing connections in the connection of exoskeleton joints, which can only swing to a certain extent in one plane. If you want to move flexibly, you need multiple joints to cooperate together.

This undoubtedly limits the range of motion and flexibility of the exoskeleton's joints.

It’s okay to put it on the lower limbs. After all, most of the human legs just do pendulum movements, just swing back and forth, and no one will be boring and boring.

But for the upper body, this design is a bit awkward.

In addition to the finger joints of the palm, the upper limbs of the human body, that is, the arms, also have four joints: shoulder, elbow, wrist and radioulnar.

Among them, the shoulder joint has the functions of flexion, extension, abduction, and internal and external rotation. Therefore, the joint head is spherical, which is called a spherical joint. Relying on the advantages of the spherical joint structure, the shoulder joint can flex from 0° to 180° and extend 0°. °~50°, abduction 0°~180°, internal and external rotation 0°~90°, it is one of the most flexible joints in the human body, even more flexible than the wrist joint.

Chen Xin's father said that the arm can't be lifted, and a large part of it is affected by the movable joints of the exoskeleton in the shoulder.

After all, Chen Xin used two pendulum connections in the shoulder joint of the exoskeleton. One is responsible for swinging back and forth, and the other is responsible for swinging up and down. The cooperation of the two joints can also allow the arm to move flexibly within a certain range.

It can be limited by the limitations of the structure itself, plus the need to connect the power-assisted structure, the flexibility of this part is limited.

The most obvious manifestation of this is that the user's arms cannot be raised higher than the shoulders, and there is no way to bend them back.

In addition, the connecting joints of the exoskeleton’s elbows can only perform flexion and extension of 0°~90° due to the problem of the connection structure, which is a full 60° less than the flexion and extension of normal arm joints of 0°~150°. This makes it impossible for the user to remove the helmet on his head with his own hands.

If you want to improve flexibility, you can only adjust the connection structure of the exoskeleton joint, increase its angle of movement, or use a more complex structure to make it more flexible.

It is not impossible to use spherical joints with the same structure as human bones, but there is a layer of cartilage on the joint surface of human bones and joints. Only by relying on this layer of cartilage that can continuously regenerate can the human body withstand the wear and tear of joints.

And even so, some people still suffer from severe joint wear and tear due to high-intensity labor, resulting in joint strain.

For machinery, if it is replaced with spherical joints, mechanical wear will be an unavoidable problem.

Can not be regenerated, only bearings and lubrication can be used to reduce friction, or replace after serious wear, but frequent replacement will undoubtedly increase maintenance costs, which goes against Chen Xin's original intention to reduce costs.

Moreover, the use of ordinary metal materials on the spherical joint cannot withstand high-strength use, and the use of wear-resistant high-strength materials will increase the cost.

In addition, the only way is to add more movable joints to achieve a more flexible angle of movement, but the complex structure will make maintenance extremely troublesome, which makes Chen Xin suddenly fall into a bald endless loop.