Zhou Jianhua arrived at Tonglin Coal Mine 20 minutes early, and when he came to the workshop of the machine repair class, Fang Guisheng, the leader of the machine repair class, was already inside.

Fang Guisheng, like Zhou Jianhua, also lives east of the Wengong River, and the distance from the Tuanlin Coal Mine is farther than Zhou Jianhua.

"Good morning, squad leader Fang! You're here so early?! Zhou Jianhua said hello to Fang Guisheng.

"Master Xiao Zhou is here, you're pretty early!" Fang Guisheng replied with a smile: "Hehe, Master Xiao Zhou, don't call me squad leader, there are only two or three people in our machine repair class, and if someone hears a joke, you can call me Lao Fang." ”

Fang Guisheng is a retired employee of the Jiangnan Provincial Chemical Machinery Factory directly under the province, and he has the pride and conceit of a veteran technician master of a state-owned enterprise in his bones, and he disdains the name of this kind of mechanic class that does not enter the stream of small coal mines run by the community. Before Zhou Jianhua appeared, Fang Guisheng had always regarded himself as the best technician in Tuanlin Coal Mine, and in the entire mine, except for Chen Guodong, the mine manager, he didn't pay attention to anyone.

But yesterday, Zhou Jianhua showed his outstanding electrical maintenance skills in public in an amazing way, which made Fang Guisheng secretly amazed. Fang Guisheng thought to himself, even in the Jiangnan Provincial Chemical Machinery Factory where he worked, he couldn't find a technician who could surpass Zhou Jianhua in electrical maintenance, which was enough to make Fang Guisheng secretly look at Zhou Jianhua and look at him differently.

"Hehe, okay then, I'll call you Master Fang in the future!" Zhou Jianhua said with a smile: "Don't call me Master Xiao Zhou, just call me Xiao Zhou, I don't have much experience in our maintenance work here, and I will ask you for more advice in the future." ”

Fang Guisheng smiled and said, "Okay! I'll call you Xiao Zhou! Xiao Zhou, don't be too modest, I can see a little bit of your level, you are unfathomable! Let's help each other and learn from each other in the future. ”

"Master Fang, you've already talked about it. I know that you are an old technician of the state-owned machinery factory, how dare I make a mistake in front of you! Zhou Jianhua modestly made a joke and asked, "Master Fang, how do you think my work is arranged?" ”

"Your work arrangement, to be honest, I don't know how to arrange it now, and I don't have any electrical things to fix for the time being." Fang Guisheng replied: "What about my thoughts, as soon as you came, you should first familiarize yourself with our working environment, and usually inspect and repair equipment with us, what do you think?" ”

"Okay, then I'll follow you around today and help you learn some experience."

Zhou Jianhua replied.

At this time, electrician Zhuang Minghui also arrived, and when he saw Zhou Jianhua, he came up to greet him warmly.

Zhuang Minghui is in his thirties, thin and small, and a member of the Tonglin Commune. After graduating from high school, he became an electrician in the commune, and has been in the mechanic class since he entered the Tonglin Coal Mine. Although he is doing the work of mechanical repair, but limited by the cultural level and the constraints of the living environment, the knowledge of mechanical and electrical products has been stuck at the level of "visible and incomprehensible", although he wants to learn some professional knowledge, but has not been able to enter.

Zhuang Minghui saw Zhou Jianhua's amazing maintenance skills yesterday, especially after learning that Zhou Jianhua entered the maintenance class, he had the idea of learning from Zhou Jianhua. People who grew up in the countryside in this era always have a humble mentality in front of the city people, even for young people like Zhou Jianhua, Zhuang Minghui has always been courteous, not to mention that Zhou Jianhua is really capable, Zhuang Minghui will not mind being a little brother and a horse boy for Zhou Jianhua, who is also more than half a head tall.

So as soon as Zhou Minghui saw Zhou Jianhua today, he greeted Zhou Jianhua with "Master Zhou" one by one, and gave up his seat to Zhou Jianhua to sit, and he moved a wooden box to sit down, and took a relay to chat with Zhou Jianhua while dismantling.

Zhou Jianhua looked around the workshop of the machine repair class, with an area of about 100 square meters, and there was an old Soviet-style ordinary lathe against the wall, as well as electric welding machines, gas cutting, gas welding equipment, desktop drilling machines, fitter tables and other major maintenance equipment, some plates, profiles and tooling tools were scattered in the corner of the wall or leaning on the tool cabinet by the wall, and the two masters Fang and Zhuang each had a desk placed near the door of the workshop.

On the whole, the equipment and tools in the workshop are simple and practical, and can do some simple repair work on machinery and equipment, but the level of repair technology cannot be expected too high.

Zhou Jianhua saw that Master Fang was pondering a dismantled chain link at this time, looking at it over and over, looking puzzled, so he asked, "What's the matter, Master Fang?" What's wrong with this chainlink? ”

"Oh, this chainlink...... It's troublesome...... It was only a few days after it was repaired, and it was scrapped after only a few days......" Fang Guisheng frowned and replied: "It's been repaired twice, it's still like this, that scraper hasn't been able to use it these days......"

"Oh...... So how did you fix it? Zhou Jianhua looked at the heavily worn, deformed and severely corroded chain link in Master Fang's hand, which was obviously a section of the conveyor chain on the scraper conveyor.

"I found a scrapped chain of the same specification, selected a section from it and replaced it, and it ended up like this in less than three days...... This is already the second time, both times. Master Fang muttered, and suddenly looked up in surprise and asked:

"Xiao Zhou, do you also know about mechanical maintenance?"

"Oh, I don't know much either, let's know a little bit." Zhou Jianhua said modestly: "I heard that this kind of mining chain used on our scraper is very demanding. ”

Zhou Jianhua, who has mined coal in the mine, knows the use of the scraper conveyor, and the mining chain used on it is to be soaked in the groundwater rich in chemicals for a long time in the production, the chain corrodes quickly, and also faces the problem of high-intensity production wear and metal fatigue, not only to have high strength and good toughness, but also to resist wear and corrosion, whether it is the selection of materials or the requirements for the heat treatment process of the processing process are very high.

Zhou Jianhua, who was a doctor in the field of electromechanical and electromagnetic waves in his previous life, knew that if he was produced by a professional manufacturer, there would be more than a dozen links in the surface treatment and heat treatment process alone, with the existing equipment conditions of the machine repair class, if you want to repair the chain to a state that can be stably produced and used, it is tantamount to a fool's dream, but if you just want to solve the urgent need and let it be used for a month after repair, it is still possible.

"Well, I also know that the chain of Lu Dao is demanding, so I also did heat treatment for it according to my previous experience in our machinery factory, I originally thought, even if our conditions are limited, the treatment is not in place, but it should be fine with ten days and half a month, how do you know that Lu Dao has been repaired twice, and each time it only took three days to do it......

"And what kind of heat treatments have you done?" Zhou Jianhua asked again.

"Annealing, quenching and tempering have been done, and the heat treatment should be relatively complete......" Master Fang listened to Zhou Jianhua's question so carefully, so he simply said his own treatment steps, and then stared at Zhou Jianhua with a ridiculous look, and said in his heart, Do you still know the metal heat treatment process?

Of course, Zhou Jianhua knows several heat treatment processes mentioned by Master Lu Daofang. To put it simply, annealing is done to eliminate material stress and improve the comprehensive properties of the material, quenching is done to improve the surface hardness to make it wear-resistant, and tempering is done to reduce brittleness after quenching.

Speaking of which, Master Fang should have done all the heat treatment processes, but no matter which heat treatment link there are many treatment methods and methods, each of which is adapted to different materials and application needs, Zhou Jianhua can be sure that Master Fang must have used some inappropriate treatment methods to cause the rapid failure of this chain link.

Thinking of this, Zhou Jianhua asked again: "Master Fang, it's so troublesome to repair this, even if it is repaired according to you, it won't be very long to last for ten days and half a month, why don't you just replace it with a new one - the equipment often has to be stopped for maintenance, it looks like saving, but it will inevitably affect production, and the actual gain outweighs the loss." ”

"Alas! Xiao Zhou, don't you know that our mine funds are tight...... Director Chen told me that the profit of our mine is very low, so if you can repair it, you have to ......repair it as much as possible," Fang Guisheng replied.

Zhou Jianhua looked at Master Fang in surprise, and said that coal mining will be less profitable? ! The coal bosses who knew about the road in his previous life were all so fat that they were dripping with oil! Zhou Jianhua didn't quite understand why Director Chen wanted the other master to say this, but he didn't want to ask too much, thinking that since Director Chen asked for this, there must be a reason for him.