King of Industry

  Chapter 614 Hidden dangers of electrical protection

  After resting at "Xingtai International Foreign Trade Company" for the whole night, Zhao Guoyang took a taxi by himself to "SMS Construction Machinery Group Company".

  In the new product development department, as soon as Zhao Guoyang entered, he saw many people gathering together to discuss issues.

   "Minister Zhao, I think the electrical protection measures of our mine hoist are worth discussing."

A stubborn voice said: "The existing protection measures on this mine hoist can only work during normal operation, but when the hoist decelerates, these electrical protections can't protect at all. It may also bring hidden dangers to safe production..."

   The voice that spoke seemed familiar. Zhao Guoyang remembered this person after a little recollection.

   This person is Kong Dezhong from the Mechanical and Electrical Department of Capital University. He, Xu Linlin, and Chen Li are both students of Ji Chongxuan, and they are also the three with the lowest education in the team brought by Ji Chongxuan.

  Listening to Kong Dezhong's questioning words, Zhao Guoyang couldn't help stepping forward and asking: "What's going on? Is there any problem during the trial production?"

   "Huh? Guoyang...Mr. Zhao!"

   Zhao Siyan was the first to react. Seeing Zhao Guoyang who was walking towards her, she couldn't help shouting.

  The rest of the people who gathered together also greeted him respectfully after seeing the boss Zhao Guoyang coming.

  Among them, Yuan Qinghua, Liu Yan, and Tang Wanru from Capital University were all present.

  In "SMS Company", several technicians from the new product development department were also present.

  Zhao Guoyang waved his hand to stop everyone from asking for warmth, turned to look at Kong Dezhong who had spoken earlier, and said, "Dezhong, you just said that the electrical protection of our mine hoist is defective?"

Hearing Zhao Guoyang's question, Kong Dezhong nodded repeatedly and said: "Yes, Mr. Zhao. Our mine hoist has entered the trial production stage now. Except for some special materials, which still need to be prepared, in terms of production and production, we have already entered the trial production stage. no problem."

   "It's just that when we reviewed the drawings in the past two days, we found a question..."

  Hearing this, Zhao Guoyang nodded encouragingly and said: "Well, it's a good thing to ask questions as soon as possible! Tell me, what's going on!"

  Kong Dezhong responded and told his discovery.

   "Mr. Zhao, our mine hoist uses a fully digital DC electric control system, which uses low voltage to provide electrical protection for the entire system."

   "According to your point, the rope speed design of our hoist has a maximum speed of 5.11m/s. At this operating speed, the running track of our hoist is approximately triangular, which is very stable."

   "There must be no problem at all during normal use. Even when decelerating, as long as the deceleration travel reaches about 30m, there will be no problem."

  Hearing this, Zhao Guoyang nodded in agreement and said: "Well, that's right. The triangle trajectory is indeed the safest and most reliable."

   It is no wonder that Zhao Guoyang was able to find the key so quickly.

  Kong Dezhong nodded lightly, and then continued: "Of course, there is no problem with normal use, but there is one situation that we have to take into account..."

   "The deceleration curve of the tug wheel plate of our mine hoist is very fast, so the stroke is naturally short and steep. Correspondingly, the response of the control components cannot keep up with the actual operating conditions."

  “The overspeed protection in the deceleration phase of the original design may not be able to achieve closed-loop control because the given speed is unstable, so that it is useless.”

  When Kong Dezhong was talking about it, two classmates, Xu Linlin and Chen Li, also nodded slightly.

   Obviously, the three of them have the same view on this issue.

  Under Zhao Guoyang's hint, Kong Dezhong's narration continued: "Some time ago, we went to several mine deposits in southern Anhui Province for on-the-spot investigation."

  "During the investigation, we found that the cages of most mine hoists are almost completely stopped by the wellhead signal workers when they stop at the upper wellhead."

   "This method makes the speed of the mine hoist fluctuate and change greatly during the use of the mine hoist. Once there is a hidden danger in the electrical protection, it is easy to cause a major accident."

Kong Dezhong finally said decisively: "So, Mr. Zhao, Minister Zhao, myself, Xu Linlin, and Chen Li, after discussing the plan, agreed that the electrical protection of our hoist needs to be redesigned and improved, otherwise , endless troubles..."

   Regarding Kong Dezhong's words, Xu Linlin and Chen Li also acquiesced.

   Seeing this scene, Zhao Guoyang cast a questioning look at Zhao Siyan and said, "Siyan, what do you think of this question raised by Dezhong and the others?"

  Zhao Siyan heard the words, and said calmly: "I have also noticed the problem that student Kong Dezhong said."

   "However, whether this electrical protection has such a big impact on the use of the entire mine hoist, I think we still need to think about it."

  After Zhao Siyan made this statement, Zhao Guoyang roughly understood what was going on.

   Obviously, it was Kong Dezhong and the others who discovered the hidden dangers that had been neglected after their on-the-spot investigation.

  But because Zhao Siyan didn't see it with her own eyes, it was difficult to make a decisive judgment just by listening to the theory.

   After all, it takes a lot of courage to deny the electrical protection of the existing mine hoist.

   As a result, Zhao Siyan's hesitation became distrust of herself in the eyes of several students. How could Kong Dezhong and the others be convinced?

  Just now a group of people were arguing endlessly about it, obviously there is an element of anger in it.

  Thinking so far, Zhao Guoyang did not directly intensify the conflict, but looked at Kong Dezhong in a detour and asked: "Student Dezhong, why is Mr. Ji not here? Are you resting in the hotel?"

"no no!"

Before Kong Dezhong could speak, Liu Yan chirped and said, "Mr. Ji was invited to be a guest at the University of Science and Technology of China in Southern Anhui Province. It seems that an Academician Ma invited him to give a lecture to the students for two or three days. time to come back…”

  After Liu Yan finished speaking, Zhao Guoyang suddenly realized.

  Indeed, Ji Chongxuan and Li Kejian, who are well-known in the industry, really can't be idle for a moment.

   From time to time, some old friends invite to various universities and companies to hold lectures.

   Li Kejian is better because he has another official status.

  In contrast, Ji Chongxuan is much busier. Almost every year he is invited to attend several or even a dozen lectures.

  Thinking of this, Zhao Guoyang let out a "huh" and said: "Well, the design work of our mine hoist has almost been completed, and Mr. Ji can really relax."

  Turning his head and taking a look at Kong Dezhong, Zhao Guoyang asked with a smile: "As for the question you just said, Dezhong, I personally agree."

   "Dezhong, you, Chen Li, and Xu Linlin are the most professional about electrical protection. There will definitely be no mistakes in this area."

  After Zhao Guoyang said these words, Kong Dezhong's face became brighter.

  Indeed, in his heart, this young Mr. Zhao and Researcher Zhao are almost as important as his own teacher.

   It is undoubtedly a glorious thing for me to be recognized by him.

Just when Kong Dezhong was secretly delighted, Zhao Guoyang said again: "The problem, Dezhong, you found out. But how to solve this problem, Dezhong, you, Xu Linlin, and Chen Li, have you got any preliminary ideas? "

  After hearing Zhao Guoyang's question, the three of Kong Dezhong looked at each other and looked at each other.

   Indeed, as undergraduates, what they can do at present is probably to find problems.

  It is still a bit difficult for them to come up with a solution to the problem.

   After all, their theoretical basis is not comprehensive and detailed enough, and they have seen too few things.

  Looking at the way the three of them bowed their heads awkwardly, Zhao Guoyang touched his chin and said, "After re-reading the drawing you added, I have some immature thoughts..."

Hearing Zhao Guoyang's humble words, Kong Dezhong sighed "Hi" and said, "Mr. Zhao, don't be modest. Others don't know your level, so don't we know it? You can answer our questions quickly." !"

  Chen Li also smiled and said: "Yes, Mr. Zhao. We are really powerless to solve this problem, and I really want to hear your method!"

   Xu Linlin, who has always been taciturn, still did not speak, but there is no doubt that there is a trace of expectation in his eyes when he looks at Zhao Guoyang.

  As for her good friend Zhao Siyan, she looked at Zhao Guoyang with full expectation, hoping that he could help with this.

   "Actually, the method to improve the electrical protection system of our mine hoist is very simple. There are only two points. One is to add a 2m/s speed limit protection to the hoist to control the moving speed of the cage."

   "The other one is to add the positive ZXK and reverse FXK of the upper wellhead detection switch on the depth indicator of the hoist, so as to set the wellhead monitoring area; in addition, add an intermediate relay ZJ and a DC speed limit relay XS."

   "When the cage enters the wellhead monitoring area at full speed, the ZJ coil is energized by the instant closure of ZXK or FXK, and automatic protection can be launched."

   "In the coil circuit, a signal relay XCJ is connected in series. One is to ensure that the 2m/s speed limit protection can only be put into operation after entering the deceleration zone; the other is to reset the coil when it is powered off to realize cycle control."

  Zhao Guoyang casually mentioned two ideas, all of which are simple and easy to implement operations.

  Kong Dezhong and the others are all high-achieving students majoring in electrical engineering, so they naturally recognized the feasibility of his proposals at once.

After a while, Kong Dezhong exchanged opinions with Chen Li and Xu Linlin, and after carefully appraising Zhao Guoyang's proposal, he gave a thumbs up in admiration and said, "Mr. It’s amazing, it’s completely easy to use, and the problem can be solved.”

  ————————————

Thanks to Qingwu Feiyang 11, Happy Xiongjun, Great Goodness, Book Friends 20180718001408209, Lao Wuzi, Leading Star __, Zhou's Collection of Books 0818, Book Friends 20180715002933028, Dragon Walking World 0331, Forgotten Happiness, Book Friends 20170803211219667, Ni Dong, all book friends and friends have given a reward and support, I will continue to work hard!

  (end of this chapter)