Forehead. Hearing this, Duan Yun looked through the car window, then let go of Cheng Qingyan's hand, started the car, and left quickly.

Duan Yun has always wanted to have a hot relationship with Cheng Qingyan, but there are too few entertainment projects for young people in this era, and now they are in the critical period of technological improvement of the large collective, Duan Yun is also very helpless.

Duan Yun can also see that Cheng Qingyan is a girl with no experience in love, she is naturally full of various fantasies about this relationship, Duan Yun doesn't want to disappoint her from the bottom of his heart, but now, the two can only have the opportunity to be alone if they go to work together at night.

The car drove all the way, and after more than ten minutes, I came to the correspondence station.

For Duan Yun and Cheng Qingyan, walking on the road to night school, this time has become very precious.

There was no one to be seen on the path of the campus, and the hands of the two were gently held together.

It's just that when Duan Yun wanted to pull Cheng Qingyan down next to a small tree with no one on the side of the road to take the next 'heartbeat', the car bell rang behind him, and two or three classmates had already come over on bicycles, talking and laughing.

Cheng Qingyan shook off Duan Yun's hand for the first time, although Duan Yun and Cheng Qingyan were the youngest in the class, and the older classmates in the class had already regarded the two as a couple, but Cheng Qingyan was thin-skinned, and she was embarrassed to be too close to Duan Yun in front of her classmates.

This made Duan Yun very helpless, the two of them didn't have much time to be alone, they had to be busy in the unit during the day, and their classmates were still in class at night, and they were like thieves if they wanted to do some 'small actions', which couldn't help but make Duan Yun depressed.

"There is no class tomorrow night, you can come to me......" As if seeing that Duan Yun was a little disappointed, Cheng Qingyan whispered to Duan Yun.

"Okay!" Duan Yun's face suddenly turned happy when he heard this.

For Duan Yun, as long as Cheng Qingyan gives him time and opportunities, other things will be easier to say a lot.

One night is enough time for Duan Yun to do a lot of things......

Although the two of them were excited, after entering the classroom, they still behaved very attentively and seriously.

Especially Cheng Qingyan, during class, she has been taking notes all the time, eager to record every word the teacher said.

After class in the evening, Duan Yun drove Cheng Qingyan to the doorstep.

"I'll come to you tomorrow night. Duan Yun said to Cheng Qingyan after sending her downstairs.

"Well, goodbye!" Cheng Qingyan waved her hand to Duan Yun lightly and walked into the corridor.

After watching Cheng Qingyan go upstairs, Duan Yun took out a cigarette and lit it, and then drove away reluctantly......

......

After Duan Yun came to the company the next day, he plunged into the workshop.

For Duan Yun, today is destined to be a busy day, after Qian Deqiang's second-hand equipment is in place, Duan Yun can carry out the modification of the preheating furnace.

The structure of the industrial preheating furnace is not too complicated, mainly composed of industrial furnace masonry, industrial furnace smoke exhaust system, industrial furnace preheater, excellent energy-saving industrial furnace driving device and industrial furnace combustion device.

Among them, the industrial furnace body includes frame support structure, furnace structure, material conveying system, etc.

Heating system, including equipment system that provides heat source to the materials in the industrial furnace, such as energy medium pipeline and equipment system, power transmission system, transformer equipment, etc.

In addition, the smoke exhaust system includes flue, chimney, heat exchanger and smoke exhaust auxiliary equipment.

In the end, all that remains is the other supporting equipment.

The furnace body of the heat-treated quenching furnace is welded by section steel and steel plate, the inner wall of the furnace lining is connected with the furnace shell by stainless steel plate, and the furnace body and furnace tank interlayer are filled with aluminum silicate refractory fiber for heat insulation.

The door of the heat-treated quenching furnace is designed in the lower part of the furnace body, which means that the workpiece enters or exits from below. The lower mouth of the furnace body is opened, and the starting and closing action of the furnace door is completed by means of mechanical transmission, through the motor, reduction box, sprocket, chain, rail, etc.

The heating element adopts a resistance band of high-resistance alloy, which is arranged on both sides of the inner tank through special hooks to insulate the inner tank.

The fan is composed of a blower and a wind deflector, and the blower motor and the heating element are electrically interlocked, as long as the blower is connected to the heating element before the power is energized, so as to ensure that the heating element can work under the condition of ventilation circulation.

The charging basket and the incoming and outgoing carts are welded by section steel, and the center of gravity of the stop degree is adjusted and hoisted up and down. This electric furnace is equipped with a basket and a cart to ensure that users can work in time. When feeding, the basket is loaded on the trolley, pulled out and promoted, and when it enters the lower part of the furnace body, the furnace door is opened and the hoist works, the chain is hooked, the charging basket is hoisted into the furnace, and the furnace door is closed to stop heating. When discharging, open the furnace door, turn the hoist action, put the charging basket into the pool to stop quenching disposal, and then put the basket out of the water surface and put it on the plane of the trolley, the chain is decoupled, the hoist is lifted, the trolley is pulled out, and the aging disposal is stopped.

A pool is provided at the lower part of the furnace body, so that the workpiece can enter the pool in a short time to stop quenching and disposal.

Duan Yun had already drawn the design drawings of the furnace body modification before, and some of the modifications used some patented technologies in later generations.

The entire modification plan would take nearly five or six days, but Duan Yun wanted to lead his research team to complete it within three days.

Duan Yun's first step was to replace the small fan of the previous heating furnace with the repaired high-power fan of the power plant, which was the most simple and straightforward modification.

Next, Duan Yun began to modify the temperature control instrument of the furnace.

Replacing the outdated heating furnace temperature control device, Duan Yun directly replaced it with a relatively advanced electronic potentiometer controller with an AC contactor that was replaced from the power plant.

This kind of element uses electron tube and semiconductor separating element, which has a simple structure and low cost, and the temperature control accuracy is less than ±10 °C, which is higher than the previous furnace in terms of temperature control accuracy.

Working overtime at noon, Duan Yun let the canteen fry two pots of meat and vegetables and send them to the workshop, and continued to study the modification steps in the afternoon with the workers in the dispatch room.

The current situation is to complete the equipment modification one day earlier, and the finished product can be made one day earlier, at present, the labor service company basically has no orders, and the human resources are too idle, Duan Yun must resume the production of the workshop as soon as possible.

At about three o'clock in the afternoon, just as Duan Yun arranged for workers to refill and fill the aluminum silicate refractory fiber on the furnace wall, Qin Shengli trotted all the way to the workshop.

"Manager Duan, a car came from the gate of the factory, saying that it was a delivery ...... from the diesel engine factory," Qin Shengli said after coming to Duan Yun's side.

"Diesel engine factory?" Duan Yun was stunned for a moment when he heard this, then showed excitement, and waved his hand to Qin Shengli and said, "Hurry up." ”

Afterwards, Duan Yun and Qin Shengli walked quickly to the gate of the factory.

"Hello comrade, I am Duan Yun, the manager of the factory, may I ask what ...... you are pulling on this car?" Duan Yun stepped forward and asked the truck driver.

"This is a sample of the product that our factory sent to you, and Manager Duan, you sign for it. After the truck driver handed a slip to Duan Yun, he immediately turned around and opened the truck's baffle, on which were two wooden boxes, and half of the gearbox shell with a metallic luster was exposed.

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