"So he changed it to this, and that's ...... in the middle."

"Looks a bit like a wrench....."

"Yes, the axe is hollow here, there's a bolt here, this part of the bolt is not tattooed, and here it's wearing two movable shaped wheels. It's an asymmetrical ,......."

Zhou Zheng looked down at this picture: "This structure is more complex than the old axe, and it must be more expensive to make, so it is better to use than the original?"

Not convinced?

"This is based on science!" Li Jianguo looked up at the three of them, and drew a sketch of the wood that had been split: "When this axe is chopped from the bottom down, the front edge splits the wood, and then the axe surface is in contact with the wood on the left and right protrusions of the two special-shaped wheels..."

The three of them couldn't take their eyes off it.

"This is the wheel, this is the split wood, the axe is at the bottom, and then we need to use the protrusion on top to prop the wood along the wood fibers, and the force of this propagation should be horizontal from the middle to the outside. ”

"Hmmm......"

"Hmm..."

"Hmm!"

"The friction will heat up, so we used to be a little hot after chopping the wood axe, but in fact, the work done by the strength was consumed and turned into heat, but this work is useless.

We know that the structure of wood fibers is such that they go up and down, and to hold it up, it must be a force that is perpendicular to the direction of the fiber bending.

So what role can this structure play in this now?"

Li Jianguo's eyes lit up when he spoke, as if he regarded this as a small lecture hall.

"When this more prominent angle comes into contact with the wood, it is carried upwards by the rolling friction, and the direction of this force is this, along this ......

Then the fillet on the right, which is not in contact with the wood, will go down to this side of the wood, and the direction of this force is like this, and the two forces can be broken down into the upward force and the right force. ”

The three of them watched intently as Li Jianguo marked arrows on the map.

"This is stretched, the outward force can hold the wood open, if the contact surface is large, the friction will be great, and the human strength will be wasted!

But the angle of this special-shaped wheel is also very particular, it must be the most labor-saving shape, and it must be two, one is not good. ”

"In addition, the handle of the axe should be a little curved in this shape, which is the most labor-saving when swinging,......"

Li Jianguo put down his pen and looked at the three of them, and suddenly became a little nervous: You can't understand it, right? At that time, his son and himself seemed to explain it like this, this is junior high school knowledge.

"Is this an invention from the book?" Lupin couldn't help but ask.

Li Jianguo shook his head: "No, this is what he thought after he arrived in Xiangjiang,... In addition, he said that this is not high-tech, regardless of the formula of metal, the structure is used in a few basic knowledge points of junior high school, geometry, mechanics...... No ......."

What are the knowledge points in junior high school?....

The three of them looked at each other unconsciously, they had all chopped firewood, but they didn't think so deeply, the friction was ineffective, the special-shaped wheel, such a high-tech axe!

It can benefit thousands of people, and then it's just junior high school knowledge points...... That kid just dropped out of school after the first year of junior high school!

I don't know how many years have been compiled for those textbooks, why hasn't anyone improved the axe so much?

No wonder that kid ......

Zhou Zheng raised his head and exhaled a long breath, laughed, and shook his head for a while: "There are university questions in life!"

Li Jianguo breathed a sigh of relief, and seemed to understand.

Yiming said that in fact, many inventions and creations are not so complicated, and they are not necessarily in the laboratory, they are everywhere in life, and the country should create conditions for these things to be made as soon as possible,......

"Did that happen?"

"Yiming is making things over there, some are using ready-made spare parts, if not, use machine tools to make samples first, and mass production will open the mold, this thing should not be produced, that is, it has applied for a patent. ”

Zhou Zheng pinched his chin: "It's better for us to use this thing ourselves, but if you say it...... Is it good to sell?"

Ji Pengfei nodded: "I think this should be easy to sell if it is easy to use, I also know a little about foreign countries, and they also burn firewood." ”

Li Jianguo snorted: "Yiming said that even in developed places like the United States, they often have to chop wood, burn fireplaces and the like, that is, the kind of stoves built into the wall, he saw this from the book."

Americans also often chop firewood by themselves, I heard that labor is very expensive, and they also have a tradition of doing things by themselves, even if this axe is a little more expensive, there is a market, even if the rich people chop wood, they have to pick high-end goods!"

"Premium goods.... Huh..."

"Compared to the original, this is indeed a high-end product...... How much is he going to sell?"

"I didn't say this, it has something to do with the material,......

Although the night was dark, the three of them did not feel tired at all.

"I heard that there are mooncakes made with ice cream filling?"

"Yes, this will soon be on sale, that ice cream is made directly from fruit, processed with industrial liquid nitrogen, very convenient, just pay attention to production safety. The Li family's factory is doing this!"

"Liquid what?"

"Nitrogen, liquefied nitrogen, the temperature is very low, the fruit is cut into a metal can, poured into the liquid nitrogen, the molecular structure in it will change, and then this taste is very good!"

"Useful, and food..... It's all inventions......" Lupin sighed and wrote the record.

"As long as we need all kinds of needs in life, there will be a perfect plan, sometimes these solutions are already available, sometimes they have not been found.

Yiming is based on this idea to design things, he said that design is very important, good design brings high-quality products, can save a lot of resources for the society,......"

Ji Pengfei glanced at Lu Ping, and there was no need to emphasize that the pen had already moved quickly.

"Is there anything else?"

"Lots of ......"

Li Jianguo's expression seemed a little helpless, and he picked up the pen and drew a few simple drawings: "I remember what things I remember, I was looking at them when he was drawing, and he also told me what was the use, for example, the plastic slide pipe that can be connected to the building can be quickly transferred directly from the upstairs... This kind of pulley can be pedaled directly on the ground,......"

"A table made of plastic strips and tubes, it's not easy to draw... It can be stretched, and there is a complete set of equipment that can be artificially planted indoors, in fact, it is a pipe and a water pump, plus a fertilizer made of pellets. The granular fertilizer is mainly for saving, and indoor planting can actually grow vegetables indoors in the city."

Although Li Jianguo's drawing is simple, it can be understood by the three of them with verbal explanations.

These are all things that you can understand at a glance and know that they will be convenient when you think about them, but you have never seen them in life.

"Anything else?"

Li Jianguo sighed.

"I can't draw most of the pictures. Many of them are parts, and the parameters are directly marked...... Only when you put it up will you know what it is for. For example, he drew something like this, I couldn't see what it was, and he said that it could be made transparent with plastic, and it could be stuck directly on a tree branch, so that the branch could take root on the tree!"

"Rooting in a tree?"

"Yes, because if you plant a tree with seeds, it will be slower, and the faster is the strip, but it is more susceptible to infection, fill this with special ingredients, cut a hole in the branch, and wait until the root grows, you can see the root through this shell, and wait until the root grows to a certain extent, you can prune and plant it in the ground, and the survival rate will be higher. ”

“...... What is the ingredient?"

"The ingredient is the auxin of the plant, we don't know if we have produced it, if there is a place for importing, but it may not be cheap. ”

"But it doesn't matter if it's not produced, the plant itself has it, and it's everywhere in the new sprouts and young leaves, and you can transfer it in by collecting these and doing proper treatment when managing pruning, but he just thinks so, and if you really do it, you have to let people do experiments to see if it can work......

"This is the knowledge point of junior high school?"

"This... It seems to be the same...... But ......" Li Jianguo hesitated.

"But?"

"The book doesn't specifically mention this application, and the textbook Ichiming has read only says that when plants grow, it is the production of hormones that plays a role. That's probably the sentence......"

"Then he...."

"He thought that since it is produced by the plant itself, then of course it can be extracted and used, and it doesn't need to be very fine, after all, sometimes the concentration is too high, and if we say that we specialize in purchasing auxin, we must also dilute it......

Li Jianguo was a little distracted, "I actually have some impressions of what he said, as if I have learned it but I haven't learned it...... If only I had thought that way earlier...... Back then, we picked up manure and composted it, and the burned plant ash was piled up together, and that was wrong......"

"That's wrong?"

"One is acidic, the other is alkaline, put together to cause a chemical reaction, but also release ammonia, on the one hand smelly, on the other hand, nitrogen fertilizer runs out of ......"

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