"We have adopted an eccentric multi-axis cutter design method, which is to support the cutter eccentrically at the front end of multiple drive shafts. In this way, when the drive shaft is rotated in the same direction, the cutter tool holder can move parallel rings to dig out a tunnel section similar to the cutter shape.

With this design, as long as the frame shape of the cutting machine is changed, you can dig various sections such as rectangular, oval, horseshoe, and round, which have excellent adaptability…”

In the large lecture hall of the National Convention Center, a report meeting called "Domestic Shield Machine Technology Seminar" is in progress. On the podium at the front of the lecture hall, the person who talked with a laser pen pointing at the graphics on the big screen was Feng Lingyu, chief engineer of the shield machine project of Chenyu Engineering Machinery Company.

In front of Feng Xiaochen, Feng Lingyu always had a bit of childishness and even laziness, but standing on this podium, facing a group of peers and many reporters, Feng Lingyu was full of vitality and had a strong confidence in his eyebrows, showing the true nature of a returnee elite.

"General Gong Feng, an important difference between a non-circular shield and a circular shield is the difference in the control axis and the correction torques of the non-circular shield in each direction are different. How do you solve this problem?" An expert from China Railway Research Institute raised his hand and asked.

Feng Lingyu switched a slide and pointed to the screen and introduced: "For this issue, we have adopted a reconfigurable partition propulsion system. The entire system consists of 32 cylinders and is divided into 6 to 8 partitions according to needs. The thrust of each partition can be adjusted separately. The propulsion jack can be grouped on the operating panel of the control room. According to construction needs, the grouping can be adjusted at any time and reconstructed."

"General Engineer Feng, how is your double-cutting structure designed?" asked another expert.

"We use an x-shaped main body design. When the cutter wheel rotates, the gaps at both ends of the x-shaped can provide space for another cutter wheel to pass..."

"I noticed that your knife drive uses a motor drive method, while hydraulic motor drive is commonly used abroad. What is the reason for your design like this?"

"The advantage of motor driving is that it is low noise and high efficiency. The disadvantage is that it is large in size and the output torque is smaller in the same amount. As the shield diameter and system power increase, the fuel tank and pump station corresponding to the hydraulic motor become larger and larger, and the structure becomes more and more complex. For construction units, it will greatly increase the difficulty of maintenance. We think that in large-diameter shields, it is more appropriate to use motor driving."

“…”

This seminar was jointly organized by the State Equipment Industry Company and Chenyu Engineering Machinery Company. Needless to say, the equipment company's face is already well-known in China and has close ties with major universities, research institutes and engineering machinery colleagues. The two companies came forward at the same time and invited domestic big names in engineering machinery. The weight of this report cannot be underestimated.

When the experts were invited to attend the conference, they had some supportive attitude. After listening to Feng Lingyu's design ideas, everyone's emotions were mobilized. In recent years, the number of domestic tunnel projects has increased dramatically, and the application scope of shield machines has been continuously expanded. There are more than a dozen units developing shield machines. Relevant experts from universities and research institutes are often invited to participate in the design.

During the development process, everyone encountered various difficulties, some have been solved through hard work, and some are still in the process of exploration. Chenyu Company was the first company to complete all designs. Their design ideas and breakthroughs in some key technologies are very inspiring to everyone.

Some of the reporters sitting behind were busy taking photos, while others were typing on the keyboard on their laptops. The reporters could only listen to the discussions of technical experts in the front, and they couldn't even write some words. But that didn't matter. The task they received was to vigorously promote the seminar. Some key content organizers had already written the press release, and they only needed to extract the content that was useful to them from the press release and fill it in the report.

Feng Xiaochen has always attached great importance to publicity. He knew that in this era, the media can succeed or fail, which depends entirely on whether you have mastered the media. The equipment company has great responsibilities, but the power in its hands is very limited. What Feng Xiaochen can use is the benefits brought by the development of equipment, the second is his connections in the equipment field, and the third is the power of public opinion.

Because of this, there is a special public relations and publicity department within the equipment company, which is responsible for contacting various media and will give relevant reporters some benefits during festivals. In addition, it is often able to provide them with some important news clues to make them run faster than other colleagues. The reporters reciprocate, and when the equipment company needs their help to build momentum, they are completely unspeakable.

"General Engineer Feng, I have a question to ask for advice." When the media asked a question, a reporter stood up, held his glasses, and asked seriously: "I am a professional in industrial news and have some understanding of shield machines. Just now, General Engineer Feng introduced in PPT that the rated capacitance force of your shield machine is 75,000 KN, and I heard that the indicator of Pumai in Germany is 81,000 KN. Does this mean that your shield machine is not as good as Pumai?"

The reporters sitting next to them were all rectangular. Damn, everyone has been child caregivers. Please, can you be more professional? This rated force is just flashed by on the slides and you actually saw it. You also said that you have heard of Pumai’s level of 81,000 Qianniu. Everyone has graduated from the journalism department. Did your school’s professional courses say what Qianniu is?

I think this in my heart, and everyone will not miss this problem at all. Since the organizer has deliberately arranged child care, it is naturally this issue that is very important. In future reports, even if today's weather is written incorrectly, this issue must not be ignored.

"I'll explain this for General Manager Feng." An expert from the Railway Design Institute stood up, and the staff who were doing service in the audience quickly handed him a wireless microphone. The expert blew up twice, tried the microphone, and then began to talk about it: "We have tried the issue of the rated pinch force of the pinch control system..."

Then, he reported a long list of experimental data, which made people dizzy when they heard it. In the end, he only knew one conclusion, that is, there is actually no essential difference between 75,000 and 81,0000. It is unnecessary to be confused about this issue.

The background information of the experts was also projected on the front-end large screen in a timely manner. The long list of titles, such as special allowances, Yangtze River scholars, outstanding contributions, and national first prizes, is even more dizzy than the data the experts just said. Of course, you don’t have to remember these contents, just remember one thing, that is, the person is the top talent in China, and his words are at least in the field of tunnel engineering.

"General Engineer Feng, I also have a problem..."

After answering the previous question, another reporter stood up, which was also a tricky and weird question. If the people from Hetiel Company were present, they would find that this question happened to be one of the conditions for Hetiel Company to bid for equipment in the Huoyuan Metro project, and Chenyu Company's shield machine happened to be stuck on this condition.

"I'll answer this question for General Engineer Feng..." An expert from the Automation Research Institute of the Ministry of Industry and Information Technology stood up. This question is about automatic control systems, and he is the authority in this field.

These reporters and experts who volunteered to endorse the letter were naturally the nursery that the equipment company and Chenyu company were looking for. These questions and answers were prepared. Especially the experts' answers were absolutely reasonable and well-founded, and they could be used as evidence for lawsuits and taken to the table to make a serious decision.

When the equipment company and Chenyu Company came to invite experts to be childcare, these experts all accepted it happily. Everyone is engaged in shield machines, and who doesn’t want domestic shield machines to be used quickly? Chenyu’s shield machines are recognized, which represents not only Chenyu Company, but also all domestic brands. The strength and fame of some domestic state-owned engineering machinery companies are much greater than Chenyu Company. If Chenyu Company’s products are reliable, domestic users have no reason not to believe in the products of these large state-owned enterprises.

The actions of Hetiel Company can be regarded as a kind of unspoken rule in the industry, and there are countless manufacturing companies that have been harmed by such unspoken rules. I heard that the purpose of this seminar is to challenge the unspoken rules in the industry and support domestic equipment. Almost all experts can do not have the appearance fee and bring their own dry food to stand up for Chenyu Company.

"Hey, Lao Wang, what does that question you just asked? "

"This is a matter, have you never heard of the bidding for Huoyuan Metro engineering equipment?"

"Huoyuan Metro, what is that? Can you eat it?"

"You don't know about Huoyuan Metro. Huoyuan City, Heyang Province, is preparing to build a subway now. I'll tell you..."

"Oh, so that's the case. Hold the grass, I'm saying..."

"I've made the equipment company anxious, haha, I've seen a good show..."

Below the stage, the reporters began to exchange inside information with each other. When the equipment company invited the reporters to come, some words were not spoken very thoroughly, which was also the meaning of not wanting to give people a handle. The public relations department of the equipment company knew that the reporters had extremely sensitive sense of smell. As long as they were given a thread for some things, they would naturally make the cause and effect clear.

Of course, there are also some news that equipment companies do not want to spread, which inevitably spread:

"By the way, do you know that this Chief Engineer Feng is the younger brother of General Feng of the Equipment Company?"

"The cake seller, such a strong material, who did you hear?"

"Hey, Feng Xiaochen, Feng Lingyu, have you noticed the name of Chenyu's company..."
Chapter completed!