Doomsday Bunker Upgrade Chapter 274: Design difficulties

A set of samples is made, and it is natural to test it. Because the old work clothes used by his father are used, Chen Xin also invites 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 raise my hands, this is not suitable for doing things." Chen Xin's father put on this exoskeleton protective suit, after moving his body, he gave his opinion: "And This helmet is too big and inconvenient."

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

Chen Xin's father wanted to remove the helmet from his head, but because of the joint structure of the exoskeleton, he could not bend his arm more than ninety degrees, so Chen Xin had to help remove the helmet.

Chen Xin’s father, who took off the helmet, said to Chen Xin: "Even the helmet has to be removed with the help of someone else. How can your design be okay? The exoskeleton must at least ensure the normal activities of the human body and not cause obstacles." /

"Then I will adjust it. It should be a problem with the joint connection structure." Chen Xin listened humbly to the advice given by his father, and he had already seen the problem.

Because of cost concerns, Chen Xin adopted a relatively simple design for the structure of the exoskeleton. However, it is clear that this overly appropriate design makes this exoskeleton greatly compromised in flexibility and cannot even meet actual needs.

Helping his father remove the exoskeleton from his body, Chen Xin asked his father again: "Dad, how does it work for protection?"

"It's a bit heavy, but fortunately, it's almost the same as wearing a cotton jacket." Chen Xin's father opened the zipper of the protective suit and took it off: "It feels a little boring to wear, but other things are fine. "

"That seems to be okay. I want to reduce some weight and adjust the air permeability." Chen Xin took a pen and wrote down what his father had said in a notebook on the side.

After taking off this slightly heavy exoskeleton protective suit, Chen Xin’s father said to his son: “The problem of clothes is all small things. The key is this exoskeleton. You have designed this thing If people wear it when they are doing things, then it should not affect the flexibility of the body in the first place.

To design a thing, you must first figure out what you design 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 It is wrong in itself, no matter how well designed it is, it goes against your original purpose.

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

After speaking earnestly, Chen Xin's father patted his son on the shoulder, and Chen Xin's mother called for help.

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

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

For human bone joints, it is not easy to put them on a mechanical exoskeleton. The more flexible the mechanical joint, 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. For flexible activities, multiple joints are required to cooperate.

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, the two legs of human beings do pendulum movements most of the time. They only need to swing back and forth. No one will be bored and split.

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

The upper extremity of the human body, that is, the arm, in addition to the finger joints of the palm, also has four joint parts: shoulder, elbow, wrist and radioulnar.

The shoulder joint has the functions of flexion, extension, abduction, and internal and external rotation. Therefore, the joint head is spherical and is called a spherical joint. With the advantage of the spherical joint structure, the shoulder joint can bend 0°~180° , Extension 0°~50°, abduction 0°~180°, internal and external rotation 0°~90°, it can be called one of the most flexible joints of the human body, even more flexible than the wrist joint.

Chen Xin's father said that the inability to lift his arm was largely due to the active joints of the exoskeleton in his shoulders.

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After all, Chen Xin uses two pendulums to connect the shoulder joints 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.

The flexibility of this part is limited due to the limitations of the structure itself and the need to connect the power-assisted structure.

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 joints of the exoskeleton elbow can only do 0°~90° flexion and extension due to the connection structure. Compared with the normal arm joints 0°~150° flexion and extension, there is less foot The full 60° range of motion makes it impossible for the user to take off the helmet on his head with his own hands.

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

It’s not impossible to use spherical joints that have the same structure as human bones. It’s just that there is a layer of cartilage on the joints of the bones of the human body, and the human body can withstand the wear and tear of the joints by relying on this layer of cartilage that can be continuously regenerated.

And even so, there are still people who suffer from severe joint wear and tear due to high-intensity labor and suffer from joint strain.

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

Unable to regenerate, 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.

And 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, only adding more movable joints to achieve a more flexible movement angle, but the complex structure will make maintenance extremely troublesome, which makes Chen Xin suddenly fall into a bald death cycle.