Huang Aihua looked at Li Weidong with a look of surprise, before this, Huang Aihua just regarded Li Weidong as Zhao Guodong's follower, and he didn't have to care about it at all, Huang Aihua didn't even write down Li Weidong's name.

However, Li Weidong was able to accurately say Sakurada Co., Ltd., which surprised Huang Aihua.

At that time, the Chinese people could only name foreign brands such as Panasonic, Sharp, and Sanyo, and they knew almost nothing about other foreign brands. A name like "Sakurada Co., Ltd." can only be known by an expert in the field of machinery and equipment.

"This little comrade still understands machinery and equipment?" asked Huang Aihua.

"This little comrade doesn't remember my name. Li Weidong complained in his heart.

Then Li Weidong nodded helplessly, and said modestly: "I just know a little bit." In general, the frequent failures of hydraulic pressure are nothing more than vibration and noise, hydraulic shock, hydraulic oil leakage, crawling during operation, valve spool being stuck and excessive temperature. ”

"It seems that this little comrade is an insider!" Huang Aihua said.

However, even if Li Weidong is an expert in hydraulics, Huang Aihua did not take it to heart, and there are several mechanical engineers in the technical department of Yankuang, all of whom are experts in hydraulics.

Li Weidong continued: "If I guess correctly, the failure of your hydraulic equipment should be the blockage of the suction filter, right?"

When this sentence was spoken, Huang Aihua's expression became unsettled again, and he nodded seriously: "There is indeed a situation where the oil suction filter is blocked." ”

"And the hydraulic cylinder components are grinding, right?" Li Weidong asked again.

Huang Aihua almost got up from his seat, and he nodded more solemnly: "That's right, there are also hydraulic cylinder components worn!"

"The cause of the failure given by Sakurada Co., Ltd. is that the hydraulic piston rod will be corroded by coal particles and story gas in the coal mine in the reciprocating motion of stretching out and retracting, resulting in pollutants seeping into the gap between the piston rod and the guide bushing, which further accelerates the wear of the hydraulic cylinder assembly, and leads to the corrosion of the paint surface in the hydraulic tank, which makes the paint in the tank peel off and blocks the suction filter of the hydraulic pump. Li Weidong said slowly with a calm face.

This time, Huang Aihua really couldn't sit still, and what Li Weidong said was exactly the same as the reason for the failure given by Sakurada Co., Ltd.

The engineers of Sakurada Co., Ltd. came to this conclusion after studying the damaged hydraulic equipment, and Li Weidong did not even see the gate of the mining area, and at the table of this guest house, he guessed the cause of the failure just by relying on Huang Aihua's words.

No matter how stupid Huang Aihua is, he can see that the young man in front of him, who is about twenty years old, is definitely not an ordinary person.

"May I ask this comrade, oh no, what is this teacher's name?" Huang Aihua stood up and asked with a cautious expression.

"His name is Li Weidong, but he is our baby!" Zhao Guodong immediately introduced from the side.

In fact, when they first met, Zhao Guodong had already introduced Li Weidong, but at that time, Huang Aihua regarded Li Weidong as a passer-by, and he didn't care about him at all.

Now, in order to avoid embarrassment, Zhao Guodong once again introduced Li Weidong.

"It turned out to be Mr. Li. Huang Aihua nodded with a smile, and then said: "Guodong, your freight office is really amazing, and you can still be worthy of college students! ”

Huang Aihua regarded Li Weidong as a college student, Huang Aihua felt that Li Weidong was so young, only a college student could have such an understanding of mechanical technology, and it was the first thing to say.

Zhao Guodong just smiled and didn't deny it. Huang Aihua is praising Li Weidong, if he stands up and denies it, saying that Li Weidong is a junior high school graduate, wouldn't it make both parties embarrassed, so they simply acquiesced.

In '85, college students are the absolute pride of the sky, even if they are old workers with twenty or thirty years of work experience, it is not an exaggeration to call college students "so-and-so teacher".

Li Weidong asked again: "Director Huang, Sakurada Company said that it was helping you upgrade your equipment, what is this equipment upgrade plan, can you tell me?"

"Hey, don't mention it! When it comes to this plan, I'm angry!" Huang Aihua sighed helplessly, and then said: "Sakurada Company doesn't tell us the method of equipment upgrade at all, they say it's a trade secret and can't be passed on." ”

"If I don't tell you about the equipment upgrade plan, how can they upgrade?" asked Li Weidong again.

"Sakurada will send engineers with tools to the site to help us upgrade, and they also put forward a lot of requirements, such as eating and living well, reimbursing round-trip travel expenses, eating and drinking, and the most annoying thing is that when they upgrade the equipment, we are not allowed to watch from the side!" Huang Aihua said indignantly.

"This is too much, isn't it!" Zhao Guodong took the lead in coming out to fight the grievances.

Li Weidong looked calm, such a request is a normal thing in Li Weidong's opinion. Even at the beginning of the 21st century, when foreigners were invited to repair the shield machine, people were pulling the cordon from afar and preventing the Chinese from approaching.

China's technology is backward, and it can't make what it needs by itself, and it can only pinch its nose and recognize it when it is stuck in the neck by foreigners. Foreigners also take advantage of China's technological backwardness to make money from China in a different way.

For example, when selling equipment, add some non-essential things, such as bullying you for not understanding, only selling the original version, and then making a fortune in the name of equipment upgrades, such as leaving a back door in the maintenance of equipment, if the equipment fails to repair, you will have to pay sky-high maintenance fees.

Obviously, Yankuang was tricked by this Sakurada Co., Ltd. in this way.

Huang Aihua took advantage of the strength of the wine and scolded Sakurada Co., Ltd. for his black heart, and Zhao Guodong next to him also coaxed, but the two sang and scolded for a long time, but it did not help solve the problem.

In the end, Li Weidong said: "The working environment in the mine is indeed very complicated, and coal particles will indeed cause pollutants to seep into the gap between the piston rod and the guide bushing, and the small particles of coal are still some hard, which will cause wear and tear of hydraulic cylinder components, but this problem is not difficult to solve, only a protective sleeve needs to be installed." ”

"Of course, we thought about installing protective covers, and we have a rubber products factory in Yankuang, and the protective covers that can be made are not easy to use. The hydraulic piston rod is to be retracted back and forth, and soot will still enter it after a long time. ”

Huang Aihua paused, and then said: "And the engineer of Sakurada Co., Ltd. also said that the protective sleeve can only protect the hydraulic cylinder assembly to a limited extent, but the contaminants will eventually enter the hydraulic oil tank, causing the paint in the oil tank to peel off and clog the oil suction filter of the hydraulic pump. Our engineers have experimented with this, and it is. ”

"Hehehe......" Hearing this, Li Weidong laughed.

"Hey, Mr. Li, what are you laughing at, you think what I said is wrong? But our own engineers can't be mistaken!" Huang Aihua said dissatisfiedly.

"Director Huang, you have been cheated by Sakurada Co., Ltd.," Li Weidong said.