Countercurrent 1982

Chapter 500 Personal Computer
Duan Yun had previous experience in refitting a numerically controlled preheating furnace, so he is familiar with the digital control part of refitting a well-type carburizing furnace this time.

As for the digital control circuit board, Duan Yun has drawn the blueprint in advance and sent it to the workshop. Within a day or two, the integrated digital control circuit board will be made.

In addition, in the refitting of the furnace body, Duan Yun thickened the shell of the carburizing furnace. The shell is welded with steel plates and section steel. The refractory layer of the furnace lining is made of fiber brick double-layer lining. The heating area is paved with high-strength lightweight refractory bricks. The insulation layer is composed of diatomite bricks and aluminum silicate fiber, which not only satisfies the use effect, but also thickens the thickness of the refractory fiber of the insulation layer. Compared with the previous furnace body, it has good insulation performance and is conducive to greatly saving energy.

These refractory bricks and aluminum silicate fibers are all purchased by Duan Yunrangqian from a company's material warehouse. Since they are new products, the price will be a little more expensive, but compared to its energy saving The electricity bill is still very cost-effective.

The heating element is firstly made of nickel-chromium resistance alloy wire, which is wound into a spiral shape. This resistance wire has the characteristics of high temperature, processability, repeatability, weldability, etc., high radiation rate, non-magnetic, corrosion resistance and good plasticity.

In addition to the transformation of these furnaces, Duan Yun also specially designed a carbon potential temperature control system, which is a closed-loop control system consisting of an intelligent carbon potential controller, a special oxygen probe for heat-shock resistant pit furnaces, and a solenoid valve.

The principle of this system is also very simple, that is, in the control process, a certain electric potential is formed for the oxygen probe according to the carbon dioxide atmosphere in the skull, and the electric parameter is returned to the detector, which is the same as the best value stored in the detector in advance. Compared with the process parameters, if the carbon is low, the switch connected with the enrichment agent is opened, and the flow rate of the carburizing medium is increased, thereby increasing the concentration of carbon in the furnace.

If the carbon content in the furnace is high, the switch connected to the diluent is turned on, and the diluent gas enters the furnace, thereby achieving the purpose of reducing the carbon content in the furnace.

If the carbon content is moderate, all switches are off.

In order to achieve the effect of rapid temperature control, Duan Yun also installed a fan on the furnace cover to stir the temperature and carburizing gas in the furnace, so as to heat the parts to be processed evenly.

The digital temperature control system set by Duan Yun has greatly improved the accuracy compared with the previous manual control.

Duan Yun's modification plan uses the mature technology from his previous life, and he doesn't remember some details completely, so it will take a while to debug.

At present, for the two new carburizing furnaces, it is necessary to run one of them first, record various parameters, and carry out large-scale modification on the other one, so that it will not affect the production, but also allow his technical transformation work to be promoted. .

The technical core of this carburizing furnace modification lies in this digital intelligent control system.

It is said to be a digital system, but in fact, the equipment in Duan Yun's hands cannot make a real numerical control system.

The calculation speed of the early computer in this era was relatively low. Although it had little impact on the scientific calculation and data processing at that time, it could not meet the requirements of real-time control of machine tools, including the previously modified CNC automatic gear hobbing machine. In fact, it used digital logic circuits. A computer dedicated to machine tools is used as a numerical control system, which is called hardware, connected to numerical control, and referred to as "numerical control".

Fortunately, whether it is a gear hobbing machine or a carburizing furnace, the precision function and sensitivity requirements of numerical control are not too high, so with Duan Yun's electronic technology skills, it is easy to use digital logic circuits to build a control system.

However, if Duan Yun wants to modify more powerful and sensitive numerical control electronic equipment, he will need some special instruments, including a personal computer capable of writing programs and an interface device for entering programs into the control chip.

But at the beginning of the reform and opening up in the 80s, it was simply impossible for individuals to buy computers, and even most state-owned enterprises did not have personal computers.

The reason for this, on the one hand, is that personal computers were very expensive in the 80s, mainly by imports. An IBM XT imported computer cost 1 US dollars, while the domestic price was 3 yuan, which was relatively low for the average wage at that time. For ordinary Chinese who only have 40 yuan, the price is unimaginably high.

On the other hand, there were not many people in China who knew computer technology at that time. At that time, computers did not have mature software systems such as Windows, and the programming language was bIsac, which was very difficult and could only be learned in university computer courses.

It is precisely because of these two reasons that in the early 80s, there were basically no privately owned computers in China, and even the vast majority of ordinary people did not even know what a computer was.

But Duan Yun understands that if he wants to complete the digital transformation of domestic equipment, he must have computer equipment, but now how to purchase this equipment has become a big problem.

Duan Yun is not short of money now. After nearly a year, selling antennas and speaker equipment, as well as bank loans, he already has savings of more than 20 yuan. He is willing to spend more than 3 yuan to buy a personal computer, but Duan Yun I don't know where to buy it.

There may not be such things as computers in Daxing or even SX provinces, so Duan Yun can only focus on big cities like BJ, Shanghai, and Guangzhou.

Duan Yun is at his wits end, the factory is currently in a critical stage of production, and the new equipment has just been put into production. There are many problems that need to be solved by him, so he can't travel to these cities, but fortunately, there is Zhao Changfeng from the sales department.

Early the next morning, Duan Yun called Zhao Changfeng to his office as soon as he got to work.

"Manager Duan, are you looking for me?" Zhao Changfeng asked Duan Yun after entering the office.

Zhao Changfeng, who had just been promoted to the chief of the sales department, was full of joy, his job title and salary were raised by one level, and the most important thing for him was that Duan Yun was very valuable to him.

Zhao Changfeng has been on business trips all over the country for several months, and Zhao Changfeng has accumulated good sales and social experience. He is very familiar with the position of chief of the sales department, and Duan Yun also rewards him very high. All aspects are good, and I have found a lot of insights.

"Sit!" Seeing Zhao Changfeng walk into the office, Duan Yun smiled and motioned him to sit down, and then said: "Old Zhao, I'll give you a task this time. You go to BJ on a business trip and help me see where there are There are no imported computers for sale.”

"Imported computers?" Zhao Changfeng was taken aback when he heard the words, and someone asked Duan Yun, "What is a computer?"

Although Zhao Changfeng is somewhat knowledgeable, he has never heard of the word computer. In the past, he only heard about computers in the newspapers, and computers are generally only available in large state-owned enterprises, and ordinary people have never seen them.

　One piece was blocked yesterday, mainly because some things related to that era cannot be written, but it has little effect on the plot, I hope everyone will forgive me.

　　
　
(End of this chapter)