In the conference room, when Zhao Guoyang answered Tang Wanru's question concisely and clearly, there was a commotion among the technicians on "SMS Company".

Before, these people had never seen Zhao Guoyang's ability.

Everyone thinks that Mr. Zhao is just a rich second generation, and at most he knows a little bit about technology.

Who knew that after listening to Mr. Zhao’s story just now, he was obviously a good person.

Zhao Guoyang didn't know what everyone was thinking about him. He smiled and said, "Okay, Wanru, the problem of 'spindle' should be solved, right? Do you have any other questions?"

Tang Wanru said "ah" and shook her head continuously.

Zhao Guoyang nodded and turned his eyes to the technicians of his company.

"If you have anything you want to ask, please speak freely. Especially the 'mine hoist' we purchased, if you don't understand anything in terms of structure or principle, you can also discuss it!"

After everyone exchanged their eyes, a technician in his forties raised his hand and said, "Mr. Zhao, I would like to ask, why does this 'mine elevator' that is about to be developed in our factory not use friction? What is the difference between it and the principle of winding?"

After this technician asked this question, everyone's eyes showed hope.

Looking at everyone's expressions, Zhao Guoyang nodded slightly, then raised his arms and started to tell with ease.

"Before answering this question, let me ask you one more thing, that is, the working principle of the winding hoist. After you dismantle the mine hoist we purchased, you should know it?"

"Yes, Mr. Zhao, we all know this."

"Yes, the winding type is to wrap the steel wire around the drum and then lift it!"

Listening to the following technicians' talk, Zhao Guoyang nodded and said, "Well, since everyone has understood the working principle of the winding hoist, the working principle of the friction hoist is much simpler to explain."

"As everyone knows, the lifting wire rope of a friction hoist is different from a winding hoist."

"They are not wrapped around the drum, but rely on the friction between the wire rope and the pads on the main wheel to make the lifting wire rope move together with the main wheel, and drive the lifting container hanging at the end of the wire rope to move upward or downward."

"In order to improve the operation effect, the lifting system of friction hoist keeps the tension difference between the lifting wire ropes on both sides during operation, and usually there is a balanced tail rope hanging at the level of lifting the container."

"When the lifting machine moves, the weight of the lifting wire rope and the suspended lifting container are pressed on the friction pad with a certain tension. The friction force generated causes the wire rope and lifting container to move up or down with the rotation of the main wheel."

Zhao Guoyang breathed a sigh of relief and continued: "Basically, this is the working principle of a friction hoist. It is generally suitable for deep wells, while multi-rope friction hoist can better adapt to the needs of lifting large mines."

"As for winding hoists, they are suitable for shallow and inclined wells, which can adapt to the work needs of multi-level double-trench lifting. It should be said that in terms of application, winding hoists are more extensive than friction hoists."

After Zhao Guoyang finished speaking, he picked up the teacup on the table and drank two sips of water to moisten his throat.

Zhao Guoyang had actually been struggling with the choice of friction and winding elevators before.

With his attainment in engineering machinery, it would be impossible to calm down and build a friction hoist.

But in that case, it will take too long, and it is difficult to tell what effect the final product can have.

After all, domestic manufacturers cannot meet the needs of high-level elevators in some basic parts.

So after careful consideration, Zhao Guoyang decided to start with simple things.

With the experience of developing winding hoists, the company will feel much more at ease when entering friction multi-rope hoists in the future.

Seeing Zhao Guoyang drinking water and resting, Li Zhaohe said in a timely manner: "Okay, Mr. Zhao has told you about the characteristics of these two elevators and their working principles."

"Everyone has anything else to understand. You can come to me to discuss it later."

"Now, do you have any other questions? If not, let's go to the next issue and discuss the division of labor after the project is established..."

For the technicians of "SMS Company", before developing this mine hoist, the biggest difficulty has been solved, so there will naturally be no other problems.

Seeing that no one asked questions anymore, Li Zhaohe was about to speak.

At this moment, a thin male student sitting next to Ji Chongxuan raised his hand tremblingly.

"Uh..." Li Zhaohe's words came to his mouth and were swallowed back.

But considering that the other party is not from his own factory and it is difficult to have an attack, he could only force a smile and said, "Student, do you have any questions, please just agree."

This thin male student is naturally Xu Linlin, a student of Professor Ji Chongxuan.

Compared with Kong Dezhong, who is big and thick, and Chen Li who is flying, Xu Linlin should be the one with the most outstanding ability among the three students brought by Ji Chongxuan.

After the six students were together during this period, everyone basically knew this.

At this time, I saw him raise his hand and speak, not only Kong Dezhong and Chen Li, but also Yuan Qinghua, Liu Yan, Tang Wanru and others also shot puzzled eyes at Xu Linlin.

Xu Linlin first stood up and gave a gift to the audience, and then told his own questions in detail.

"Mr. Zhao, we have also made some serious understanding of the structure and working principle of the mine hoist."

"But we are still a little unfamiliar with the current development of this kind of construction machinery in China, especially internationally. I hope you can give us a detailed answer."

"In addition, the teacher has already briefly explained the patent of 'DC all-digital new electronic control system' invented by Mr. Zhao."

"One of my questions is, what is your electronic control system compared to the international advanced level..."

After hearing the thin student's words, a sigh sounded in the conference room.

The technicians of "SMS Company" lamented that the problem of this young student was too difficult, and this was simply treating Mr. Zhao as an expert and scholar in "mine elevator".

What students like Yuan Qinghua and Liu Yan sighed was that Xu Linlin's question was considered to be a question.

Yes, in the first meeting before, although Zhao Guoyang roughly talked about the difference between domestic mine hoists and world-class advanced products, he did not explain in detail what the gap was.

In this case, when Xu Linlin asked this question, he had the meaning of "breaking the casserole to ask the end".

After Xu Linlin asked this question, everyone's eyes naturally focused on Zhao Guoyang.

Everyone was more or less suspicious of this "General Zhao" and probably he might not be able to answer such professional questions.

Among them, only Ji Chongxuan looked at Zhao Guoyang with the most special look.

There was no worry in the eyes of this boss, but only expectations and appreciation.

After putting down the teacup, Zhao Guoyang signaled Xu Linlin who was still standing there and asked him to sit down first.

Then, Zhao Guoyang turned his gaze to everyone, smiled slightly and said, "Student Xu's question is very good."

"Since we are going to build the 'mine hoist' product, we must first clarify its current most advanced technical level so that we can have a catch-up target."

"First of all, let's talk about the situation in the country!"

Zhao Guoyang reached out to signal to Li Zhaohe around him and said to everyone: "At present, the highest level of mine hoists in China should be the Southwest Mining Machinery Equipment Factory."

"The elevator we Mr. Li purchased for everyone for disassembly is the factory we purchased."

"We should also understand the technical level of domestic mine hoists during the dismantling process, so I won't say much. Now, I will talk to you about the development research status of mine hoists internationally..."

When Zhao Guoyang said this, all the members of the audience held their breath and looked at him intently.

Zhao Guoyang did not keep it a secret, waved his arm and said, "Since the early 1960s and more than 30 years, the technical level of mine hoists in the international community has improved a leap forward."

"During this period, the mechanical parts of the elevator and the electrical parts have developed rapidly. More importantly, the development of the two is mutually promoting and improving each other, showing a complementary development trend."

"At the beginning, the mine hoist was just a simple system for driving the reel through a reducer. Later, a slow DC motor and a direct rotating hoist were gradually installed with the DC motor cantilever."

"In the 1970s, after the world-renowned Siemens invented the AC-DC-AC frequency conversion principle of vector control, it also marked the technical era of synchronous motors to replace DC motors to achieve speed regulation, and it officially arrived."

"In the early 1980s, the world's first cantilever-driven elevator was launched in the Germanic Monopol mine; a few years later, the mechanical and electrical hoist, jointly developed by Mavghh and Siemens, was born in the Germanic Romberg mine."
Chapter completed!