Chapter 275

When a set of samples is made, it's natural to test them. Because it's his father's old work clothes, Chen Xin invites his father to help him with the test.

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

"I can't walk, I can't lift my hands, it's not suitable for work." Chen Xin's father put on this suit of exoskeleton protective clothing and gave his opinion after moving his body: "moreover, the helmet is too big and inconvenient."

"So many questions?" Chen Xin was surprised by his father's comments on the finished product.

Chen Xin's father wanted to take the helmet off his head, but because of the joint structure of the exoskeleton, he was unable to bend his arm more than 90 degrees, so Chen Xin had to help take off the helmet.

Chen Xin's father, who took off the helmet, said to Chen Xin, "even the helmet needs help. How can you have no problem with this design? Exoskeletons should at least ensure the normal activities of the human body, and should not cause obstacles. "

"I'll adjust it. It's about the joint structure." Chen Xin listens to his father's advice with an open mind, and he has seen the problems.

Because of the cost concerns, Chen Xin adopted a relatively simple design for the exoskeleton structure, but it is obvious that this kind of over improvised design greatly reduced the flexibility of the exoskeleton, and even could not meet the actual needs.

He helped his father remove the exoskeleton from his body. Chen Xin asked his father, "Dad, how about protective clothing?"

"It's a little heavy, but it's OK. It's like wearing a cotton padded jacket." Chen Xin's father opened the zipper of the protective clothing and took it off: "it's a little stuffy to wear, but nothing else is wrong."

"That seems OK. I'll try to reduce the weight and adjust the air permeability." Chen Xin took a pen and wrote down what his father said in a notebook.

After taking off the slightly heavy exoskeleton protective clothing, Chen Xin's father said to his son, "the problem of clothes is a small matter. The key is the exoskeleton. If you design this thing for people to wear when doing things, you can't affect the flexibility of the body in the first place.

To design a thing, you must first make clear 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 good the design is, it is also contrary to your original purpose.

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

Chen Xin's father patted his son on the shoulder and was called to help by Chen Xin's mother.

Chen Xin was taught by his father so much that he readjusted his mind and put the whole set of exoskeleton protective clothing on the workbench in order, intending to readjust it.

One of the key points mentioned by Chen Xin's father is the joint design of exoskeleton.

It is not so easy to put the action that is very easy to realize for human skeletal joint on the mechanical exoskeleton. The more flexible the mechanical joint is, the more complex its mechanism will be.

In order to reduce the cost, Chen Xin's exoskeleton joints are all connected by swing, which can only swing in a certain degree in one plane. If he wants to move flexibly, he needs multiple joints to cooperate.

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

It's OK to put it on the lower limbs. After all, most of the time, the human legs just do pendulum movement. They just need to swing back and forth. No one is bored to split the fork.

But for the upper limb, it's a bit awkward.

The upper limb of the human body, that is, the arm, apart from the finger joint of the palm, has four joints: shoulder, elbow, wrist and radius.

The shoulder joint has the functions of flexion, extension, abduction, internal and external rotation, so the joint head is spherical, which is called spherical joint. With the advantages of spherical joint structure, the shoulder joint can bend 0 ° to 180 °, extend 0 ° to 50 °, abduct 0 ° to 180 ° and rotate 0 ° to 90 ° internally and externally, which is one of the most flexible joints in human body, even more flexible than wrist joint.

Chen Xin's father said that the inability to lift the arm was largely due to the movement of the exoskeleton in the shoulder joint.

After all, Chen Xin uses two pendulums to connect the shoulder joint of exoskeleton, one is responsible for swinging back and forth, and the other is responsible for swinging up and down. The combination of the two joints can also make the arm move flexibly within a certain range.

The flexibility of this part is limited due to the limitation of the structure itself and the need to connect the auxiliary structure.

The most obvious performance is that the user's arm can not be raised higher than the shoulder, and there is no way to bend back.

In addition, the elbow joint of exoskeleton can only do 0-90 ° flexion and extension because of the problem of connection structure. Compared with the normal arm joint 0-150 ° flexion and extension, it has a full 60 ° range of motion, which makes it impossible for users to take off the helmet on their own hands.If we want to improve the flexibility, we can only adjust the connection structure of exoskeleton joint, increase its movement angle, or adopt more complex structure to make it more flexible.

It's not impossible to use spherical joints with the same structure as human bones. It's just that there is a layer of cartilage on the joint surface of human bones and joints. Relying on this layer of cartilage that can be regenerated continuously, the human body can withstand the wear and tear of joints.

And even so, there are still people because of high-intensity labor, resulting in serious joint wear, joint strain disease.

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

Bearing and lubrication can only be used to reduce friction, or replace after serious wear. However, 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 spherical joints can not support the use of high strength, and the use of wear-resistant high strength materials will increase the cost.

In addition, there are only more active 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 dead cycle.

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