Jia Zhiqiang and they also learned the relevant courses of the powerful shot peening machine when they were in school, but the machine that they used as an example in the textbook was a foreign product, and the powerful shot peening machine made by Duan Yun and Cheng Qingyan was very simple and not the same as the graphics in the textbook, so they didn't see that this was a shot blasting machine at the first time.

This kind of powerful spraying equipment is still rare in China, the main reason is that the technical performance of domestic mechanical products is not high, and the mechanical properties are mainly based on heat treatment, and the strong shot peening is relatively high in terms of technology and cost, so there are very few domestic manufacturers, most of them are concentrated in some military departments.

The Longteng gearbox produced by Duan Yun is mainly for foreign markets, so in order to make the product performance meet the requirements of foreign manufacturers, some key components have been shot peened.

"You also designed this machine?" asked Kong Jing on the side to Duan Yun.

"Actually, my friend did it. Duan Yun replied casually.

"Master!" At this time, Erhu quickly ran into the workshop.

"What's the matter?" Duan Yun asked.

"Sister-in-law is here, he went to the office building just now, but he didn't find you, and now he will come over immediately. Erhu said to Duan Yun.

"Qingyan, she's here?" Duan Yun was stunned for a moment when he heard this.

Now there is no one in the labor service company who does not know Cheng Qingyan, and they all know her relationship with Duan Yun, so Cheng Qingyan's entry into the factory workshop of the labor service company is basically unimpeded, and no one in the security department dares to stop her, after all, she is the fiancée of the factory director, and those who are not long-sighted will lose their jobs.

Generally speaking, Cheng Qingyan would not come to Duan Yun's factory during work, because she also has her own job, and Duan Yun has always taken the initiative to find her, so when Duan Yun heard that Qingyan actually came to the factory to look for him, he suddenly felt a little surprised.

And when Duan Yun just straightened his collar, he saw that Cheng Qingyan had already appeared at the door of the workshop.

"Qingyan!" Seeing Cheng Qingyan, Duan Yun immediately greeted him with a smile.

"You haven't washed your hair in two days. Seeing Duan Yun coming, Cheng Qingyan glanced at him and said.

"I've been so busy these two days...... Duan Yun gently stroked his hair with his hand, he also knew that Cheng Qingyan was a girl who loved cleanliness very much, Duan Yun used to pay attention to the same thing when he dated him before, but in the past two days, because Duan Yun worked overtime in the factory every day, he didn't date her, so he hadn't taken a shower for a few days.

"By the way, why did you remember today?" Duan Yun asked.

"The factory cleaned the office building this afternoon, and my office has been cleaned, so I got off work a little early, and I felt that it was not interesting to go home, so I came to see you. Cheng Qingyan said to Duan Yun.

"That's right. Duan Yun smiled when he heard this.

In fact, Duan Yun could guess why Cheng Qingyan came to the factory to see him, the main reason was because Duan Yun had not looked for her in the past few days, and even asked for a leave of absence from night school.

If it was before, with Cheng Qingyan's reserved personality, she would not take the initiative to find Duan Yun, but now it is different, Cheng Qingyan, who is emotionally slow, has entered a state of hot love, and she has gradually become a little "clingy", especially now when she is with Duan Yun, her face is full of happiness, and she doesn't even care about Duan Yun's occasional "violations" on her.

Although the two have not seen each other for a few days, for Cheng Qingyan now, they feel a little tormented, but she will not say that, this time she took the initiative to come to the factory to find Duan Yun, in fact, she also struggled repeatedly for a while, and then she mustered up the courage to come.

Many girls are often such contradictory animals, they obviously like it very much, but they won't take the initiative to say it, especially girls in this era, who still have a deep tradition and reserve in their bones.

Duan Yun could naturally see some of Cheng Qingyan's careful thoughts, and from his heart, he felt that Cheng Qingyan, a girl, was actually quite cute.

"What are you busy with?" Seeing Jia Zhiqiang, Kong Jing and others following behind Duan Yun, Cheng Qingyan asked casually.

"Ah, let me introduce you, these are the new college students who came to our factory. Duan Yun turned to look at Jia Zhiqiang and the others, and began to introduce them one by one: "This is the old Jia Jia Zhiqiang, and this is Liu Yijiang......"

At this time, Jia Zhiqiang, Liu Yijiang and others were also stunned when they saw Cheng Qingyan.

No one thought that such a beautiful girl would come to Duan Yun's factory.

Today's Cheng Qingyan is wearing a pink tweed coat, leaving a beautiful and fashionable wavy curl, delicate and fair facial features, tall and straight, at a glance, slim and elegant, compared with the big stars on the calendar, it is not inferior at all.

Kong Jing, the only girl among the 5 college students, is also a very beautiful girl, and she was already the goal pursued by many young men when she was on the college campus before, but when she stood face to face with Cheng Qingyan at this time, she was half a head shorter in height, and in terms of appearance and temperament, Kong Jing was also inferior.

"This girl is ......" At this time, Jia Zhiqiang glanced at Cheng Qingyan and asked with some curiosity.

"He is my girlfriend Cheng Qingyan, who is the deputy section chief of the technical department of the main factory, and the two of us used to be colleagues. Duan Yun introduced with a smile, and then said: "The powerful shot blasting machine we saw before is actually a ...... designed by my girlfriend."

"Awesome......" Jia Zhiqiang said in surprise when he heard this.

"May I ask if you are also majoring in mechanics?" asked Cheng Qingyan at this time.

At this moment, Cheng Qingyan and Kong Jing's eyes met, and their eyes flashed a strange look at the same time, but they quickly retracted their gazes.

"Yes, I used to study mechanical subjects in secondary school, but after I was admitted to the night university with Duan Yun last year, I changed my major. Cheng Qingyan replied politely.

"So, you and Manager Duan are both students of Night College. Guo Xiaoming also asked at this time.

"Yes, we haven't graduated from college yet, so I should call you seniors. Duan Yun said with a smile at this time.

"Then are you going to get married soon?" Kong Jing asked again at this time.

"I thought, but now the factory is so busy, and if you get married, it will affect your studies, so you have to wait for a while. Duan Yun glanced at Cheng Qingyan next to him and said with a smile.

"You two are really talented and beautiful, you look like a couple!" At this time, Liu Yejiang also glanced at Kong Jing next to him, and praised Duan Yun rarely.