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

Before, these people had not seen Zhao Guoyang's ability.

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

Who knew that after listening to this Mr. Zhao's narration just now, he is obviously a knowledgeable person.

Zhao Guoyang didn't know what everyone thought about him, he said with a smile: "Okay, Wanru, the problem of the 'main axis' should be solved, right?

Tang Wanru let out an "ah" and shook her head again and again.

Zhao Guoyang nodded, and his eyes turned to the technical staff of his company.

"If you have anything to ask, you can also talk freely. Especially the 'mine hoist' we purchased, if there is anything you don't understand in terms of structure or principle, you can also put it forward for discussion!"

After everyone exchanged glances, a technician in his forties raised his hand and said: "Mr. Zhao, I want to ask, why doesn't the 'mine hoist' that our factory is about to develop use friction type? What is the difference between it and the winding principle?"

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

Looking at everyone's expressions, Zhao Guoyang bowed slightly, then raised his arms and spoke calmly.

"Before answering this question, first of all, let me ask you one point, that is, the working principle of the spiral hoist, you should know it after dismantling the mine hoist we bought, right?"

"Yes, Mr. Zhao, we all know this. ”

"That's right, the winding type is to wrap the steel wire around the drum and then lift it!"

Listening to the gossip of the following technicians, Zhao Guoyang nodded and said: "Well, since everyone has an understanding of the working principle of the winding hoist, the working principle of the friction hoist is much simpler to explain." ”

"As you know, the lifting wire rope of the friction hoist is different from the winding hoist. ”

"They are not wound on the drum, but rely on the friction between the wire rope and the liner on the leading wheel, so that the lifting wire rope and the main wheel move together, and drive the lifting container suspended at the end of the wire rope to move up or down. ”

"The lifting system of the friction hoist, in order to improve the operation effect, keeps the tensile difference between the two sides of the lifting wire rope basically unchanged during the operation, and usually hangs a balanced tail rope at the point of lifting the container. ”

"When the hoist moves, the self-weight of the lifting wire rope and the weight of the lifting container of the suspension are pressed on the friction liner with a certain tensile force, and the friction generated makes the wire rope and the lifting container go up or down with the rotation of the main wheel. ”

Zhao Guoyang breathed a sigh of relief and continued: "Basically, the working principle of the friction hoist is like this, it is generally suitable for deep wells, and the multi-rope friction hoist is more suitable for the needs of large-scale mine hoisting. ”

"As for the spiral hoist, it is suitable for shallow and inclined wells, and it can adapt to the needs of multi-level double-groove lifting. It should be said that in terms of application, the winding hoist is more extensive than the friction hoist. ”

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

For the choice of friction hoist and winding hoist, in fact, Zhao Guoyang has been entangled before.

With his attainments in construction machinery, it is not impossible to do it if he really settles down to engage in friction hoist.

However, in that case, it will take too long, and it is difficult to say what kind of effect the final product will have.

After all, in some basic parts, domestic manufacturers can not meet the needs of high-level hoists.

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

With the research and development experience of the winding hoist, the company will be much more relaxed when entering the friction multi-rope hoist in the future.

Seeing that Zhao Guoyang was drinking water and resting, Li Zhaohe said in a timely manner: "Okay, Mr. Zhao has told you about the characteristics of these two types of hoists, as well as the working principle. ”

"If you still don't understand anything, you can come to me after the meeting to discuss it. ”

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

For the technicians of "SMS", one of the biggest difficulties has been solved before the development of this mine hoist, and naturally there will be no other problems.

Seeing that no one was asking any more questions, Li Zhaohe was ready 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 lips and was swallowed back.

But considering that the other party is not from his own factory, and it is not easy to have a seizure, he can only force out a smile and say: "This classmate, if you have any questions, please say it directly." ”

This thin male student is naturally Professor Ji Chongxuan's student Xu Linlin.

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

This point, after the six students got along for a while, everyone basically knew it.

Seeing him raise his hand to speak at this time, not only Kong Dezhong and Chen Li, but even Yuan Qinghua, Liu Yan, and Tang Wanru all shot puzzled glances at Xu Linlin.

Xu Linlin first stood up and bowed to the audience, and then told his question one by one.

"Mr. Zhao, we have also done some careful understanding of the structure and working principle of the mine hoist. ”

"But for the current development of this construction machinery in China, especially in the world, we are still unfamiliar, I hope you can give us a detailed answer. ”

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

"My other question is, how is your electronic control system compared to the international advanced level......

Hearing the words of this thin student, a burst of exclamation rang out in the conference room.

The technicians of the "SMS company" lamented that the young student's problem was too difficult, which simply regarded his own Mr. Zhao as an expert and scholar in the field of "mine hoist".

And what students like Yuan Qinghua and Liu Yan sighed was that this Xu Linlin's question was to the point.

Yes, in the first meeting before, although Zhao Guoyang probably talked about the gap between the domestic mine hoist and the world's advanced products, he did not elaborate on what the gap was.

In this case, when Xu Linlin asks this question, there is a meaning of "breaking the casserole and asking to the end".

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

Everyone is more or less skeptical of this "Mr. Zhao", and it is estimated that he may not be able to answer such a professional question.

Among them, only Ji Chongxuan's eyes looking at Zhao Guoyang were the most special.

There was no worry in the eyes of this big guy, just expectation and appreciation.

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

Then, Zhao Guoyang turned his gaze to everyone, and said with a slight smile: "Classmate Xu's question, it's a good question." ”

"Since we want to engage in the product of 'mine hoist', the first thing is to figure out its current most advanced technical level, so that we can have a catch-up goal. ”

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

Zhao Guoyang stretched out his hand and gestured to Li Zhaohe beside him, and said to everyone: "At present, the highest level of mine hoist in China should be the Southwest Mining Machinery and Equipment Factory. ”

"The hoist for dismantling that Mr. Li purchased for everyone is the factory that was purchased. ”

"For the technical level of domestic mine hoist, in the process of dismantling, we should also understand, I will not say more, below, I will talk to you about the development and research status of mine hoist in the world......"

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

Zhao Guoyang did not sell the guanzi, and said with a wave of his arm: "Since the early sixties, to the present more than 30 years, the technical level of the international mine hoist has been improved by leaps and bounds. ”

"During this period, the mechanical part of the hoist and the electrical part have been developed at a high speed. More importantly, the development of the two is to promote and improve each other, showing a complementary development trend. ”

"In the beginning, the mine hoist was just an electric motor, a simple system of driving the drum through the reducer, and later, there were gradually DC slow motors, and DC motor cantilever mounted direct rotation hoists. ”

In the seventies, the world-renowned Siemens company invented the vector-controlled AC-DC-AC frequency conversion principle, which also marked the official arrival of the synchronous motor to replace the DC motor to achieve speed regulation. ”

"In the early eighties, the world's first hoist with a synchronous cantilever drive was launched at the Monopol mine in German, and a few years later, a mechatronic hoist was created at the Romberg mine in German, in cooperation with Mavghh and Siemens. ”

"This is also the world's first synchronous motor-driven hoist ...... that integrates mechanical and electrical."

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