In the conference room, when Zhao Guoyang talked about the synchronous motor drive hoist, Ji Chongxuan's eyes were condensed.

At the beginning of the advent of this hoist from Germain, Ji Chongxuan was entrusted by the state with the important task of developing the electrical control system of this synchronous motor drive hoist.

It's a pity that there is no way to get the core information of the original electronic control system sample, Ji Chongxuan and his research team can only return after two years of hard research.

This incident has always been a lingering shadow in Ji Chongxuan's heart.

At this time, when I heard Zhao Guoyang mention the world's first mechatronic hoist again, the sourness in Ji Lao's heart surged up in an instant.

Zhao Guoyang didn't know what Ji Chongxuan was thinking at this time, and after a slight pause, he continued to speak.

"The advent of the mechatronics hoist has led to the rapid development of lifting machinery and electrical transmission technology. At the same time, the development of electronic technology and computer technology has made the electrical control system of the hoist more ever-changing......"

When Zhao Guoyang said this, Chen Li raised his hand and asked: "Mr. Zhao, didn't our country gradually apply the electrical control system to heavy machinery in the late eighties?"

"But listen to the meaning of your words, it seems that in the early eighties, there was already relevant technology abroad. Is this possible?"

Chen Li's words resonated with Xu Linlin and Kong Dezhong.

When Ji Chongxuan gave them a lecture before, he had a detailed introduction to the application of domestic electrical control systems.

However, in terms of the due existence and development status of this technology abroad, Ji Lao did not say much.

The reason is very simple, after all, the three of them are still in the initial stage of getting in touch with electromechanical theory, and if they are instilled with the Western set of technical theories too early, it may cause a situation where the seedlings are pulled out and promoted.

Therefore, when lecturing, Ji Chongxuan deliberately avoided this field of foreign electronic control technology.

At this time, Chen Li asked such a question, and Zhao Guoyang thought a little in his heart, and he understood Ji Lao's good intentions in educating the three of them before.

However, now that they have begun to involve real product research and development, Zhao Guoyang feels that there is no need to avoid some of the previous taboos.

So Zhao Guoyang looked at Ji Chongxuan with an inquiring gaze.

When he saw Ji Lao bowing slightly, with a look of encouragement, he immediately made a decision.

Turning his head to face Chen Li, he explained word by word: "Chen Li, for the development status of electronic control technology in the world, there have not been too many reports in our country, so that everyone has misunderstood this aspect. ”

In fact, as early as the mid-seventies, foreign countries have applied programmable controller PLC to the control of hoists. The representative of this is still Siemens, so let's not mention it for now. ”

"In the early eighties, computers were widely used in the monitoring and management of hoists, and after combining the technology of computers and PLCs, the level of automation, safety and reliability of hoists has reached a new height. ”

Moreover, the application of these two technologies has provided people with a new modern means of management and monitoring. ”

After a pause for a few seconds, Zhao Guoyang continued: "Another important point I want to mention is that during this period, some large hoist manufacturers, such as Siemens, ABBA, and ALSTH, have made full use of new technologies and equipment to develop and improve the safety protection and monitoring devices of hoists. ”

"It can be said that the application of several technologies in the early eighties has made a leap forward in the technical level of the hoist......"

After Zhao Guoyang's description was finished, the members of the technical department of the "SMS company" who attended the meeting all showed very stunned expressions.

As they have been engaged in mining machinery and equipment for more than ten years, they are far inferior to the chairman in front of them in terms of understanding the development process of mine hoists.

Such a fact makes the guy feel ashamed of himself, but also admires Zhao Guoyang's academic performance.

An engineer from the technical department couldn't help but whisper to his companion: "Lao Lu, what is the origin of our Mr. Zhao, his understanding of the lifting machinery, I'm afraid he has caught up with the university lecturer, right?"

"Not only is it a university lecturer, I think it's a professor, and it may not be that our chairman knows much. ”

An older technician next to him said thoughtfully: "The most important thing is that you look at the calm and breezy face of our chairman, as if what he just said is just some skin." Such confident eyes are really amazing!"

Just when these technicians in the audience were talking, Zhao Siyan, who was sitting next to Zhao Guoyang, looked at this peer with admiration.

Zhao Guoyang's extraordinary, Zhao Siyan has been taught very early.

Whether it was at the Songjiang International Auto Show or at the technical seminar established by Jinling Automobile Group Company, Zhao Siyan witnessed Zhao Guoyang's amazing performance.

However, on those two occasions, he was just a spectator, not a participant, and he didn't have much sense of empathy except for being amazed by Zhao Guoyang's performance.

This time, the situation is completely different.

This "mine hoist" project is something that I have spent a long time collecting and preparing carefully.

Zhao Siyan believes that even Li Zhaohe, the vice president of technology, may not be better than herself in terms of understanding of the "mine hoist".

Just when Zhao Siyan secretly felt that she might really be able to help Zhao Guoyang this time and take charge alone, Zhao Guoyang's casual explanation made her "knocked into the dust" again.

Of course, Zhao Siyan did not mean to compete with Zhao Guoyang in her heart.

Her only hope is to try to show her ability in front of the other party and not be thrown too far away by the other party.

It's a pity that after seeing the current situation, Zhao Siyan could only secretly say to herself in the depths of her heart: Zhao Siyan, it seems that you have to continue to work hard. Guoyang, this guy, it's really not so easy to catch up!

When the voices of everyone in the audience gradually lowered, Zhao Guoyang continued: "Just now, I told you about the development of mine hoists in the world, and below, let's talk about the domestic situation." ”

"I already said it when I told you about it. From the mid-70s to the early 80s, it was a golden period of rapid development of various technologies of hoist, and there were many new technologies that were applied to practical operations. ”

"However, when foreign science and technology are advancing by leaps and bounds and ushering in rapid development, the development of our domestic hoist, especially the research and development of electronic control systems, has been in an extremely backward situation for a long time!"

As soon as Zhao Guoyang's words fell, the muscles on Ji Chongxuan's face trembled slightly.

This time, Zhao Guoyang happened to catch a glimpse of this scene, and he understood something in his heart.

For the current situation of backward technical level of heavy machinery such as hoists and excavators in China, in fact, Zhao Guoyang was already very clear in the era before his rebirth.

Speaking of which, this backward situation had little to do with the knowledge of those experts and scholars in China at that time.

The main reason is that the foundation of China's industry is too poor and the starting point is too low.

It's like the patent of "DC all-digital new electronic control system", which may not have been thought of in China before.

However, when they really studied deeply, they were stumped by one "roadblock" after another.

Problems such as the rated power of the DC motor can not be reached, the maximum input speed is not enough, and the speed regulation performance cannot reach a stable state, all of which restrict the imagination and creativity of domestic technicians.

In Zhao Guoyang's view, the reason why the domestic technology bulls cannot quickly reverse such a status quo is really a "non-war crime".

Emotion is emotion, but some words, Zhao Guoyang still has to continue.

He exhaled lightly, and then said: "According to what I have learned, up to now, most of the electronic control systems of the mine hoists that are being served in our country are still AC speed regulation systems with rotor loop string metal resistance. ”

"This kind of system equipment is outdated, the technology is backward, and it is far from keeping up with the development of the times......

"The backwardness of the electronic control system technology also makes our domestic hoist much behind the international advanced level in terms of safety and reliability. ”

Zhao Guoyang sighed, and then said: "Most of our domestic mine hoists, in the key parts and the deceleration section of the upper and lower wellheads, lack of effective speed monitoring devices, it is easy to cause some accidents. ”

"So just in terms of hoist control technology, we are more than a star and a half worse than foreign countries. ”

Speaking of this, Zhao Guoyang may feel that what he said is too negative, and then changed the conversation: "Of course, you don't have to be too discouraged, after all, the level of mine hoists in our country has been improving." ”

"In the mid-eighties, our country introduced more than 20 sets of thyristor DC motor control systems from Sweden, Germania and other countries. ”

"Although it is imported from the original and then installed on our own products, it can be regarded as filling the gap in the DC electric control of the domestic hoist. ”

"As for the purely domestic DC electronic control system, it has not yet come out. Perhaps, this product of our SMS company will be the first purely domestic product in the strict sense......"

Zhao Guoyang's last sentence is somewhat modest.

In fact, after his patent for "DC all-digital new electronic control system" was approved, it is impossible for any individual or enterprise in China to surpass SMS company in this regard.

After Zhao Guoyang finished this paragraph, he turned his attention to Xu Linlin, who raised the question.

He smiled and said: "Classmate Xu, basically the development status of our domestic mine hoist, that's it, do you have anything else to ask?"