After making a set of samples, it is naturally necessary to conduct testing, because it is made of his father's old work clothes, so Chen Xin took the opportunity to invite his father to help him conduct the testing.

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

"You can't take a step or raise your hands, which is not suitable for doing things." Chen Xin's father put on this exoskeleton protective suit, moved his body for a while, and gave his opinion: "And this helmet is too big and inconvenient."

"Are there so many questions?" Chen Xin was a little surprised when his father's evaluation of this 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 was unable to bend his arms more than 90 degrees, so Chen Xin could only help remove the helmet.

Chen Xin's father, who took off the helmet, said to Chen Xin: "Even someone else needs to help you take off the helmet. How can your design be fine? The exoskeleton must at least ensure normal movement of the human body and not cause obstacles."

"Then I'll adjust it, it should be a problem with the joint connection structure." Chen Xin listened humbly to the suggestions given by his father, and he had already seen the problems in it.

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

Helping his father remove the exoskeleton from his body, Chen Xin asked his father again: "Dad, how about protective clothing?"

"It's a bit heavy, but fortunately, it's almost the same as wearing a cotton jacket." Chen Xin's father unzipped the protective suit and took it off: "It feels a little boring when worn, but there's nothing wrong with the rest."

"That seems OK. I'll find a way to reduce the weight and adjust the breathability." Chen Xin took a pen and wrote down what his father said in the notebook next to him.

After taking off this slightly thick exoskeleton protective suit, Chen Xin's father said to his son: "The problems with clothes are all small things, the key is the exoskeleton. You are designed to wear this thing for people to do things, so first of all, it will not affect the flexibility of the body.

When designing something, 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 itself is wrong. No matter how well the design is, it is contrary to your original purpose.

So think about it carefully, what is the purpose of designing this thing, what you want to use it to achieve, what effect 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's shoulder and was called by Chen Xin's mother to help.

After Chen Xin was taught by his father, he also readjusted his thinking and placed the entire set of exoskeleton protective clothing on the workbench neatly, intending to re-adjust it.

One of the key points to summarize the problems mentioned by Chen Xin’s father is the problem with the joint design of the exoskeleton part.

The movements that are easy to achieve for human skeleton joints are not so easy to put on the mechanical exoskeleton. The more flexible the mechanical joints are, the more complex the mechanism will be.

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

This undoubtedly limits the range of joint motion and flexibility of the exoskeleton.

It's okay to put it on the lower limbs. After all, most of the time, human legs only do pendulum movements, and only need to swing back and forth. No one will be bored to split the horizontal forks in normal times.

But for the upper limbs, this design is a bit embarrassing.

In addition to the knuckles of the palms, the upper limbs of the human body also have four joint parts: shoulders, elbows, wrists and radial uln.

The shoulder joint has the functions of flexion, extension, abduction, and rotation inside and outside. Therefore, the joint head is spherical, called a spherical joint. With the advantage of the spherical joint structure, the shoulder joint can be bent 0°~180°, stretch 0°~50°, abduction 0°~180°, and rotation inside and outside 0°~90°. It can be called one of the most flexible joints in the human body, and is even more flexible than the wrist joint.

Chen Xin's father said that the arms cannot be lifted, and to a large part of it is affected by the moving joints of the exoskeleton on the shoulders.

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After all, Chen Xin uses two pendulum connections in the shoulder joints of the exoskeleton, one is responsible for swinging forward and backward, and the other is responsible for swinging up and downward. The combination of the two joints can also allow the arms to move flexibly within a certain range.

It can be limited by the limitations of the structure itself, and the need to connect the auxiliary structure, the flexibility of this part is limited.

The most obvious manifestation is that the user's arms cannot be raised higher than the shoulders, and they cannot bend backwards.

In addition, due to the connection structure of the exoskeleton, the connecting joints can only be bent and stretched from 0° to 90°. Compared with the 0° to 150° of the normal arm joint, the range of movement is 60° less, which makes it impossible for users to take off the helmet on their heads with their own hands.

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

It is not impossible to use spherical joints with the same structure as the human skeleton. However, there is a layer of cartilage on the connecting surface of the bone joints of the human body. Only with this layer of cartilage can the human body withstand the wear of joints.

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

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

If it cannot be regenerated, only bearings and lubrication can be used to reduce friction, or replace them after severe wear, but frequent replacement will undoubtedly increase maintenance costs, which goes against Chen Xin's original intention of reducing costs.

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

In addition, there is only the only way to add more moving joints to achieve a more flexible moving angle, but the complex structure will make maintenance extremely troublesome, which makes Chen Xin suddenly fall into a bald, dead cycle.
Chapter completed!